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wxWidgets/interface/event.h

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/////////////////////////////////////////////////////////////////////////////
// Name: event.h
// Purpose: interface of wx*Event classes
// Author: wxWidgets team
// RCS-ID: $Id$
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
/**
@class wxKeyEvent
@wxheader{event.h}
This event class contains information about keypress (character) events.
Notice that there are three different kinds of keyboard events in wxWidgets:
key down and up events and char events. The difference between the first two
is clear - the first corresponds to a key press and the second to a key
release - otherwise they are identical. Just note that if the key is
maintained in a pressed state you will typically get a lot of (automatically
generated) down events but only one up so it is wrong to assume that there is
one up event corresponding to each down one.
Both key events provide untranslated key codes while the char event carries
the translated one. The untranslated code for alphanumeric keys is always
an upper case value. For the other keys it is one of @c WXK_XXX values
from the @ref page_keycodes.
The translated key is, in general, the character the user expects to appear
as the result of the key combination when typing the text into a text entry
zone, for example.
A few examples to clarify this (all assume that CAPS LOCK is unpressed
and the standard US keyboard): when the @c 'A' key is pressed, the key down
event key code is equal to @c ASCII A == 65. But the char event key code
is @c ASCII a == 97. On the other hand, if you press both SHIFT and
@c 'A' keys simultaneously , the key code in key down event will still be
just @c 'A' while the char event key code parameter will now be @c 'A'
as well.
Although in this simple case it is clear that the correct key code could be
found in the key down event handler by checking the value returned by
wxKeyEvent::ShiftDown(), in general you should use @c EVT_CHAR for this as
for non-alphanumeric keys the translation is keyboard-layout dependent and
can only be done properly by the system itself.
Another kind of translation is done when the control key is pressed: for
example, for CTRL-A key press the key down event still carries the
same key code @c 'a' as usual but the char event will have key code of 1,
the ASCII value of this key combination.
You may discover how the other keys on your system behave interactively by
running the @ref page_samples_text wxWidgets sample and pressing some keys
in any of the text controls shown in it.
@b Tip: be sure to call @c event.Skip() for events that you don't process in
key event function, otherwise menu shortcuts may cease to work under Windows.
@note If a key down (@c EVT_KEY_DOWN) event is caught and the event handler
does not call @c event.Skip() then the corresponding char event
(@c EVT_CHAR) will not happen.
This is by design and enables the programs that handle both types of
events to be a bit simpler.
@note For Windows programmers: The key and char events in wxWidgets are
similar to but slightly different from Windows @c WM_KEYDOWN and
@c WM_CHAR events. In particular, Alt-x combination will generate a
char event in wxWidgets (unless it is used as an accelerator).
@beginEventTable{wxKeyEvent}
@event{EVT_KEY_DOWN(func)}:
Process a wxEVT_KEY_DOWN event (any key has been pressed).
@event{EVT_KEY_UP(func)}:
Process a wxEVT_KEY_UP event (any key has been released).
@event{EVT_CHAR(func)}:
Process a wxEVT_CHAR event.
@endEventTable
@library{wxcore}
@category{events}
*/
class wxKeyEvent : public wxEvent
{
public:
/**
Constructor.
Currently, the only valid event types are @c wxEVT_CHAR and @c wxEVT_CHAR_HOOK.
*/
wxKeyEvent(wxEventType keyEventType = wxEVT_NULL);
/**
Returns @true if the Alt key was down at the time of the key event.
Notice that GetModifiers() is easier to use correctly than this function
so you should consider using it in new code.
*/
bool AltDown() const;
/**
CMD is a pseudo key which is the same as Control for PC and Unix
platforms but the special APPLE (a.k.a as COMMAND) key under Macs:
it makes often sense to use it instead of, say, ControlDown() because Cmd
key is used for the same thing under Mac as Ctrl elsewhere (but Ctrl still
exists, just not used for this purpose under Mac). So for non-Mac platforms
this is the same as ControlDown() and under Mac this is the same as MetaDown().
*/
bool CmdDown() const;
/**
Returns @true if the control key was down at the time of the key event.
Notice that GetModifiers() is easier to use correctly than this function
so you should consider using it in new code.
*/
bool ControlDown() const;
/**
Returns the virtual key code. ASCII events return normal ASCII values,
while non-ASCII events return values such as @b WXK_LEFT for the left cursor
key. See @ref page_keycodes for a full list of the virtual key codes.
Note that in Unicode build, the returned value is meaningful only if the
user entered a character that can be represented in current locale's default
charset. You can obtain the corresponding Unicode character using GetUnicodeKey().
*/
int GetKeyCode() const;
/**
Return the bitmask of modifier keys which were pressed when this event
happened. See @ref page_keymodifiers for the full list of modifiers.
Notice that this function is easier to use correctly than, for example,
ControlDown() because when using the latter you also have to remember to
test that none of the other modifiers is pressed:
@code
if ( ControlDown() && !AltDown() && !ShiftDown() && !MetaDown() )
... handle Ctrl-XXX ...
@endcode
and forgetting to do it can result in serious program bugs (e.g. program
not working with European keyboard layout where ALTGR key which is seen by
the program as combination of CTRL and ALT is used). On the other hand,
you can simply write:
@code
if ( GetModifiers() == wxMOD_CONTROL )
... handle Ctrl-XXX ...
@endcode
with this function.
*/
int GetModifiers() const;
//@{
/**
Obtains the position (in client coordinates) at which the key was pressed.
*/
wxPoint GetPosition() const;
void GetPosition(long* x, long* y) const;
//@}
/**
Returns the raw key code for this event. This is a platform-dependent scan code
which should only be used in advanced applications.
@note Currently the raw key codes are not supported by all ports, use
@ifdef_ wxHAS_RAW_KEY_CODES to determine if this feature is available.
*/
wxUint32 GetRawKeyCode() const;
/**
Returns the low level key flags for this event. The flags are
platform-dependent and should only be used in advanced applications.
@note Currently the raw key flags are not supported by all ports, use
@ifdef_ wxHAS_RAW_KEY_CODES to determine if this feature is available.
*/
wxUint32 GetRawKeyFlags() const;
/**
Returns the Unicode character corresponding to this key event.
This function is only available in Unicode build, i.e. when
@c wxUSE_UNICODE is 1.
*/
wxChar GetUnicodeKey() const;
/**
Returns the X position (in client coordinates) of the event.
*/
wxCoord GetX() const;
/**
Returns the Y position (in client coordinates) of the event.
*/
wxCoord GetY() const;
/**
Returns @true if either CTRL or ALT keys was down at the time of the
key event.
Note that this function does not take into account neither SHIFT nor
META key states (the reason for ignoring the latter is that it is
common for NUMLOCK key to be configured as META under X but the key
presses even while NUMLOCK is on should be still processed normally).
*/
bool HasModifiers() const;
/**
Returns @true if the Meta key was down at the time of the key event.
Notice that GetModifiers() is easier to use correctly than this function
so you should consider using it in new code.
*/
bool MetaDown() const;
/**
Returns @true if the shift key was down at the time of the key event.
Notice that GetModifiers() is easier to use correctly than this function
so you should consider using it in new code.
*/
bool ShiftDown() const;
};
/**
@class wxJoystickEvent
@wxheader{event.h}
This event class contains information about joystick events, particularly
events received by windows.
@beginEventTable{wxJoystickEvent}
@style{EVT_JOY_BUTTON_DOWN(func)}:
Process a wxEVT_JOY_BUTTON_DOWN event.
@style{EVT_JOY_BUTTON_UP(func)}:
Process a wxEVT_JOY_BUTTON_UP event.
@style{EVT_JOY_MOVE(func)}:
Process a wxEVT_JOY_MOVE event.
@style{EVT_JOY_ZMOVE(func)}:
Process a wxEVT_JOY_ZMOVE event.
@style{EVT_JOYSTICK_EVENTS(func)}:
Processes all joystick events.
@endEventTable
@library{wxcore}
@category{events}
@see wxJoystick
*/
class wxJoystickEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxJoystickEvent(wxEventType eventType = wxEVT_NULL, int state = 0,
int joystick = wxJOYSTICK1,
int change = 0);
/**
Returns @true if the event was a down event from the specified button
(or any button).
@param button
Can be @c wxJOY_BUTTONn where @c n is 1, 2, 3 or 4; or @c wxJOY_BUTTON_ANY to
indicate any button down event.
*/
bool ButtonDown(int button = wxJOY_BUTTON_ANY) const;
/**
Returns @true if the specified button (or any button) was in a down state.
@param button
Can be @c wxJOY_BUTTONn where @c n is 1, 2, 3 or 4; or @c wxJOY_BUTTON_ANY to
indicate any button down event.
*/
bool ButtonIsDown(int button = wxJOY_BUTTON_ANY) const;
/**
Returns @true if the event was an up event from the specified button
(or any button).
@param button
Can be @c wxJOY_BUTTONn where @c n is 1, 2, 3 or 4; or @c wxJOY_BUTTON_ANY to
indicate any button down event.
*/
bool ButtonUp(int button = wxJOY_BUTTON_ANY) const;
/**
Returns the identifier of the button changing state.
This is a @c wxJOY_BUTTONn identifier, where @c n is one of 1, 2, 3, 4.
*/
int GetButtonChange() const;
/**
Returns the down state of the buttons.
This is a @c wxJOY_BUTTONn identifier, where @c n is one of 1, 2, 3, 4.
*/
int GetButtonState() const;
/**
Returns the identifier of the joystick generating the event - one of
wxJOYSTICK1 and wxJOYSTICK2.
*/
int GetJoystick() const;
/**
Returns the x, y position of the joystick event.
*/
wxPoint GetPosition() const;
/**
Returns the z position of the joystick event.
*/
int GetZPosition() const;
/**
Returns @true if this was a button up or down event
(@e not 'is any button down?').
*/
bool IsButton() const;
/**
Returns @true if this was an x, y move event.
*/
bool IsMove() const;
/**
Returns @true if this was a z move event.
*/
bool IsZMove() const;
};
/**
@class wxScrollWinEvent
@wxheader{event.h}
A scroll event holds information about events sent from scrolling windows.
@beginEventTable{wxScrollWinEvent}
You can use the EVT_SCROLLWIN* macros for intercepting scroll window events
from the receiving window.
@event{EVT_SCROLLWIN(func)}:
Process all scroll events.
@event{EVT_SCROLLWIN_TOP(func)}:
Process wxEVT_SCROLLWIN_TOP scroll-to-top events.
@event{EVT_SCROLLWIN_BOTTOM(func)}:
Process wxEVT_SCROLLWIN_BOTTOM scroll-to-bottom events.
@event{EVT_SCROLLWIN_LINEUP(func)}:
Process wxEVT_SCROLLWIN_LINEUP line up events.
@event{EVT_SCROLLWIN_LINEDOWN(func)}:
Process wxEVT_SCROLLWIN_LINEDOWN line down events.
@event{EVT_SCROLLWIN_PAGEUP(func)}:
Process wxEVT_SCROLLWIN_PAGEUP page up events.
@event{EVT_SCROLLWIN_PAGEDOWN(func)}:
Process wxEVT_SCROLLWIN_PAGEDOWN page down events.
@event{EVT_SCROLLWIN_THUMBTRACK(func)}:
Process wxEVT_SCROLLWIN_THUMBTRACK thumbtrack events
(frequent events sent as the user drags the thumbtrack).
@event{EVT_SCROLLWIN_THUMBRELEASE(func)}:
Process wxEVT_SCROLLWIN_THUMBRELEASE thumb release events.
@endEventTable
@library{wxcore}
@category{events}
@see wxScrollEvent, @ref overview_eventhandling
*/
class wxScrollWinEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxScrollWinEvent(wxEventType commandType = wxEVT_NULL, int pos = 0,
int orientation = 0);
/**
Returns wxHORIZONTAL or wxVERTICAL, depending on the orientation of the
scrollbar.
@todo wxHORIZONTAL and wxVERTICAL should go in their own enum
*/
int GetOrientation() const;
/**
Returns the position of the scrollbar for the thumb track and release events.
Note that this field can't be used for the other events, you need to query
the window itself for the current position in that case.
*/
int GetPosition() const;
};
/**
@class wxSysColourChangedEvent
@wxheader{event.h}
This class is used for system colour change events, which are generated
when the user changes the colour settings using the control panel.
This is only appropriate under Windows.
@remarks
The default event handler for this event propagates the event to child windows,
since Windows only sends the events to top-level windows.
If intercepting this event for a top-level window, remember to call the base
class handler, or to pass the event on to the window's children explicitly.
@beginEventTable{wxSysColourChangedEvent}
@event{EVT_SYS_COLOUR_CHANGED(func)}:
Process a wxEVT_SYS_COLOUR_CHANGED event.
@endEventTable
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxSysColourChangedEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxSysColourChangedEvent();
};
/**
@class wxWindowCreateEvent
@wxheader{event.h}
This event is sent just after the actual window associated with a wxWindow
object has been created.
Since it is derived from wxCommandEvent, the event propagates up
the window hierarchy.
@beginEventTable{wxWindowCreateEvent}
@event{EVT_WINDOW_CREATE(func)}:
Process a wxEVT_CREATE event.
@endEventTable
@library{wxcore}
@category{events}
@see @ref overview_eventhandling, wxWindowDestroyEvent
*/
class wxWindowCreateEvent : public wxCommandEvent
{
public:
/**
Constructor.
*/
wxWindowCreateEvent(wxWindow* win = NULL);
};
/**
@class wxPaintEvent
@wxheader{event.h}
A paint event is sent when a window's contents needs to be repainted.
Please notice that in general it is impossible to change the drawing of a
standard control (such as wxButton) and so you shouldn't attempt to handle
paint events for them as even if it might work on some platforms, this is
inherently not portable and won't work everywhere.
@remarks
Note that in a paint event handler, the application must always create a
wxPaintDC object, even if you do not use it. Otherwise, under MS Windows,
refreshing for this and other windows will go wrong.
For example:
@code
void MyWindow::OnPaint(wxPaintEvent& event)
{
wxPaintDC dc(this);
DrawMyDocument(dc);
}
@endcode
You can optimize painting by retrieving the rectangles that have been damaged
and only repainting these. The rectangles are in terms of the client area,
and are unscrolled, so you will need to do some calculations using the current
view position to obtain logical, scrolled units.
Here is an example of using the wxRegionIterator class:
@code
// Called when window needs to be repainted.
void MyWindow::OnPaint(wxPaintEvent& event)
{
wxPaintDC dc(this);
// Find Out where the window is scrolled to
int vbX,vbY; // Top left corner of client
GetViewStart(&vbX,&vbY);
int vX,vY,vW,vH; // Dimensions of client area in pixels
wxRegionIterator upd(GetUpdateRegion()); // get the update rect list
while (upd)
{
vX = upd.GetX();
vY = upd.GetY();
vW = upd.GetW();
vH = upd.GetH();
// Alternatively we can do this:
// wxRect rect(upd.GetRect());
// Repaint this rectangle
...some code...
upd ++ ;
}
}
@endcode
@beginEventTable{wxPaintEvent}
@event{EVT_PAINT(func)}:
Process a wxEVT_PAINT event.
@endEventTable
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxPaintEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxPaintEvent(int id = 0);
};
/**
@class wxMaximizeEvent
@wxheader{event.h}
An event being sent when a top level window is maximized. Notice that it is
not sent when the window is restored to its original size after it had been
maximized, only a normal wxSizeEvent is generated in this case.
@beginEventTable{wxMaximizeEvent}
@event{EVT_MAXIMIZE(func)}:
Process a wxEVT_MAXIMIZE event.
@endEventTable
@library{wxcore}
@category{events}
@see @ref overview_eventhandling, wxTopLevelWindow::Maximize,
wxTopLevelWindow::IsMaximized
*/
class wxMaximizeEvent : public wxEvent
{
public:
/**
Constructor. Only used by wxWidgets internally.
*/
wxMaximizeEvent(int id = 0);
};
/**
@class wxUpdateUIEvent
@wxheader{event.h}
This class is used for pseudo-events which are called by wxWidgets
to give an application the chance to update various user interface elements.
@remarks
Without update UI events, an application has to work hard to check/uncheck,
enable/disable, show/hide, and set the text for elements such as menu items
and toolbar buttons. The code for doing this has to be mixed up with the code
that is invoked when an action is invoked for a menu item or button.
With update UI events, you define an event handler to look at the state of the
application and change UI elements accordingly. wxWidgets will call your member
functions in idle time, so you don't have to worry where to call this code.
In addition to being a clearer and more declarative method, it also means you don't
have to worry whether you're updating a toolbar or menubar identifier. The same
handler can update a menu item and toolbar button, if the identifier is the same.
Instead of directly manipulating the menu or button, you call functions in the event
object, such as wxUpdateUIEvent::Check. wxWidgets will determine whether such a
call has been made, and which UI element to update.
These events will work for popup menus as well as menubars. Just before a menu is
popped up, wxMenu::UpdateUI is called to process any UI events for the window that
owns the menu.
If you find that the overhead of UI update processing is affecting your application,
you can do one or both of the following:
@li Call wxUpdateUIEvent::SetMode with a value of wxUPDATE_UI_PROCESS_SPECIFIED,
and set the extra style wxWS_EX_PROCESS_UI_UPDATES for every window that should
receive update events. No other windows will receive update events.
@li Call wxUpdateUIEvent::SetUpdateInterval with a millisecond value to set the delay
between updates. You may need to call wxWindow::UpdateWindowUI at critical points,
for example when a dialog is about to be shown, in case the user sees a slight
delay before windows are updated.
Note that although events are sent in idle time, defining a wxIdleEvent handler
for a window does not affect this because the events are sent from wxWindow::OnInternalIdle
which is always called in idle time.
wxWidgets tries to optimize update events on some platforms.
On Windows and GTK+, events for menubar items are only sent when the menu is about
to be shown, and not in idle time.
@beginEventTable{wxUpdateUIEvent}
@event{EVT_UPDATE_UI(id, func)}:
Process a wxEVT_UPDATE_UI event for the command with the given id.
@event{EVT_UPDATE_UI_RANGE(id1, id2, func)}:
Process a wxEVT_UPDATE_UI event for any command with id included in the given range.
@endEventTable
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxUpdateUIEvent : public wxCommandEvent
{
public:
/**
Constructor.
*/
wxUpdateUIEvent(wxWindowID commandId = 0);
/**
Returns @true if it is appropriate to update (send UI update events to)
this window.
This function looks at the mode used (see wxUpdateUIEvent::SetMode),
the wxWS_EX_PROCESS_UI_UPDATES flag in @e window,
the time update events were last sent in idle time, and
the update interval, to determine whether events should be sent to
this window now. By default this will always return @true because
the update mode is initially wxUPDATE_UI_PROCESS_ALL and
the interval is set to 0; so update events will be sent as
often as possible. You can reduce the frequency that events
are sent by changing the mode and/or setting an update interval.
@see ResetUpdateTime(), SetUpdateInterval(),
SetMode()
*/
static bool CanUpdate(wxWindow* window);
/**
Check or uncheck the UI element.
*/
void Check(bool check);
/**
Enable or disable the UI element.
*/
void Enable(bool enable);
/**
Returns @true if the UI element should be checked.
*/
bool GetChecked() const;
/**
Returns @true if the UI element should be enabled.
*/
bool GetEnabled() const;
/**
Static function returning a value specifying how wxWidgets
will send update events: to all windows, or only to those which specify that
they
will process the events.
See SetMode().
*/
static wxUpdateUIMode GetMode();
/**
Returns @true if the application has called Check(). For wxWidgets internal use
only.
*/
bool GetSetChecked() const;
/**
Returns @true if the application has called Enable(). For wxWidgets internal use
only.
*/
bool GetSetEnabled() const;
/**
Returns @true if the application has called Show(). For wxWidgets internal use
only.
*/
bool GetSetShown() const;
/**
Returns @true if the application has called SetText(). For wxWidgets internal
use only.
*/
bool GetSetText() const;
/**
Returns @true if the UI element should be shown.
*/
bool GetShown() const;
/**
Returns the text that should be set for the UI element.
*/
wxString GetText() const;
/**
Returns the current interval between updates in milliseconds.
-1 disables updates, 0 updates as frequently as possible.
See SetUpdateInterval().
*/
static long GetUpdateInterval();
/**
Used internally to reset the last-updated time to the
current time. It is assumed that update events are
normally sent in idle time, so this is called at the end of
idle processing.
@see CanUpdate(), SetUpdateInterval(),
SetMode()
*/
static void ResetUpdateTime();
/**
Specify how wxWidgets will send update events: to
all windows, or only to those which specify that they
will process the events.
@a mode may be one of the following values.
The default is wxUPDATE_UI_PROCESS_ALL.
*/
static void SetMode(wxUpdateUIMode mode);
/**
Sets the text for this UI element.
*/
void SetText(const wxString& text);
/**
Sets the interval between updates in milliseconds.
Set to -1 to disable updates, or to 0 to update as frequently as possible.
The default is 0.
Use this to reduce the overhead of UI update events if your application
has a lot of windows. If you set the value to -1 or greater than 0,
you may also need to call wxWindow::UpdateWindowUI
at appropriate points in your application, such as when a dialog
is about to be shown.
*/
static void SetUpdateInterval(long updateInterval);
/**
Show or hide the UI element.
*/
void Show(bool show);
};
/**
@class wxClipboardTextEvent
@wxheader{event.h}
This class represents the events generated by a control (typically a
wxTextCtrl but other windows can generate these events as
well) when its content gets copied or cut to, or pasted from the clipboard.
There are three types of corresponding events wxEVT_COMMAND_TEXT_COPY,
wxEVT_COMMAND_TEXT_CUT and wxEVT_COMMAND_TEXT_PASTE.
If any of these events is processed (without being skipped) by an event
handler, the corresponding operation doesn't take place which allows to
prevent the text from being copied from or pasted to a control. It is also
possible to examine the clipboard contents in the PASTE event handler and
transform it in some way before inserting in a control -- for example,
changing its case or removing invalid characters.
Finally notice that a CUT event is always preceded by the COPY event which
makes it possible to only process the latter if it doesn't matter if the
text was copied or cut.
@beginEventTable{wxClipboardTextEvent}
@event{EVT_TEXT_COPY(id, func)}:
Some or all of the controls content was copied to the clipboard.
@event{EVT_TEXT_CUT(id, func)}:
Some or all of the controls content was cut (i.e. copied and
deleted).
@event{EVT_TEXT_PASTE(id, func)}:
Clipboard content was pasted into the control.
@endEventTable
@note
These events are currently only generated by wxTextCtrl under GTK+. They
are generated by all controls under Windows.
@library{wxcore}
@category{events}
@see wxClipboard
*/
class wxClipboardTextEvent : public wxCommandEvent
{
public:
/**
Constructor.
*/
wxClipboardTextEvent(wxEventType commandType = wxEVT_NULL, int id = 0);
};
/**
@class wxMouseEvent
@wxheader{event.h}
This event class contains information about the events generated by the mouse:
they include mouse buttons press and release events and mouse move events.
All mouse events involving the buttons use @c wxMOUSE_BTN_LEFT for the
left mouse button, @c wxMOUSE_BTN_MIDDLE for the middle one and
@c wxMOUSE_BTN_RIGHT for the right one. And if the system supports more
buttons, the @c wxMOUSE_BTN_AUX1 and @c wxMOUSE_BTN_AUX2 events
can also be generated. Note that not all mice have even a middle button so a
portable application should avoid relying on the events from it (but the right
button click can be emulated using the left mouse button with the control key
under Mac platforms with a single button mouse).
For the @c wxEVT_ENTER_WINDOW and @c wxEVT_LEAVE_WINDOW events
purposes, the mouse is considered to be inside the window if it is in the
window client area and not inside one of its children. In other words, the
parent window receives @c wxEVT_LEAVE_WINDOW event not only when the
mouse leaves the window entirely but also when it enters one of its children.
@note Note that under Windows CE mouse enter and leave events are not natively
supported
by the system but are generated by wxWidgets itself. This has several
drawbacks: the LEAVE_WINDOW event might be received some time after the mouse
left the window and the state variables for it may have changed during this
time.
@note Note the difference between methods like
wxMouseEvent::LeftDown and
wxMouseEvent::LeftIsDown: the former returns @true
when the event corresponds to the left mouse button click while the latter
returns @true if the left mouse button is currently being pressed. For
example, when the user is dragging the mouse you can use
wxMouseEvent::LeftIsDown to test
whether the left mouse button is (still) depressed. Also, by convention, if
wxMouseEvent::LeftDown returns @true,
wxMouseEvent::LeftIsDown will also return @true in
wxWidgets whatever the underlying GUI behaviour is (which is
platform-dependent). The same applies, of course, to other mouse buttons as
well.
@library{wxcore}
@category{events}
@see wxKeyEvent::CmdDown
*/
class wxMouseEvent : public wxEvent
{
public:
/**
Constructor. Valid event types are:
@b wxEVT_ENTER_WINDOW
@b wxEVT_LEAVE_WINDOW
@b wxEVT_LEFT_DOWN
@b wxEVT_LEFT_UP
@b wxEVT_LEFT_DCLICK
@b wxEVT_MIDDLE_DOWN
@b wxEVT_MIDDLE_UP
@b wxEVT_MIDDLE_DCLICK
@b wxEVT_RIGHT_DOWN
@b wxEVT_RIGHT_UP
@b wxEVT_RIGHT_DCLICK
@b wxEVT_MOUSE_AUX1_DOWN
@b wxEVT_MOUSE_AUX1_UP
@b wxEVT_MOUSE_AUX1_DCLICK
@b wxEVT_MOUSE_AUX2_DOWN
@b wxEVT_MOUSE_AUX2_UP
@b wxEVT_MOUSE_AUX2_DCLICK
@b wxEVT_MOTION
@b wxEVT_MOUSEWHEEL
*/
wxMouseEvent(wxEventType mouseEventType = 0);
/**
Returns @true if the Alt key was down at the time of the event.
*/
bool AltDown() const;
/**
Returns @true if the event was a first extra button double click.
*/
bool Aux1DClick() const;
/**
Returns @true if the first extra button mouse button changed to down.
*/
bool Aux1Down() const;
/**
Returns @true if the first extra button mouse button is currently down,
independent
of the current event type.
*/
bool Aux1IsDown() const;
/**
Returns @true if the first extra button mouse button changed to up.
*/
bool Aux1Up() const;
/**
Returns @true if the event was a second extra button double click.
*/
bool Aux2DClick() const;
/**
Returns @true if the second extra button mouse button changed to down.
*/
bool Aux2Down() const;
/**
Returns @true if the second extra button mouse button is currently down,
independent
of the current event type.
*/
bool Aux2IsDown() const;
/**
Returns @true if the second extra button mouse button changed to up.
*/
bool Aux2Up() const;
/**
Returns @true if the identified mouse button is changing state. Valid
values of @a button are:
@c wxMOUSE_BTN_LEFT
check if left button was pressed
@c wxMOUSE_BTN_MIDDLE
check if middle button was pressed
@c wxMOUSE_BTN_RIGHT
check if right button was pressed
@c wxMOUSE_BTN_AUX1
check if the first extra button was pressed
@c wxMOUSE_BTN_AUX2
check if the second extra button was pressed
@c wxMOUSE_BTN_ANY
check if any button was pressed
*/
bool Button(int button) const;
/**
If the argument is omitted, this returns @true if the event was a mouse
double click event. Otherwise the argument specifies which double click event
was generated (see Button() for the possible
values).
*/
bool ButtonDClick(int but = wxMOUSE_BTN_ANY) const;
/**
If the argument is omitted, this returns @true if the event was a mouse
button down event. Otherwise the argument specifies which button-down event
was generated (see Button() for the possible
values).
*/
bool ButtonDown(int = wxMOUSE_BTN_ANY) const;
/**
If the argument is omitted, this returns @true if the event was a mouse
button up event. Otherwise the argument specifies which button-up event
was generated (see Button() for the possible
values).
*/
bool ButtonUp(int = wxMOUSE_BTN_ANY) const;
/**
Same as MetaDown() under Mac, same as
ControlDown() elsewhere.
@see wxKeyEvent::CmdDown
*/
bool CmdDown() const;
/**
Returns @true if the control key was down at the time of the event.
*/
bool ControlDown() const;
/**
Returns @true if this was a dragging event (motion while a button is depressed).
@see Moving()
*/
bool Dragging() const;
/**
Returns @true if the mouse was entering the window.
See also Leaving().
*/
bool Entering() const;
/**
Returns the mouse button which generated this event or @c wxMOUSE_BTN_NONE
if no button is involved (for mouse move, enter or leave event, for example).
Otherwise @c wxMOUSE_BTN_LEFT is returned for the left button down, up and
double click events, @c wxMOUSE_BTN_MIDDLE and @c wxMOUSE_BTN_RIGHT
for the same events for the middle and the right buttons respectively.
*/
int GetButton() const;
/**
Returns the number of mouse clicks for this event: 1 for a simple click, 2
for a double-click, 3 for a triple-click and so on.
Currently this function is implemented only in wxMac and returns -1 for the
other platforms (you can still distinguish simple clicks from double-clicks as
they generate different kinds of events however).
@wxsince{2.9.0}
*/
int GetClickCount() const;
/**
Returns the configured number of lines (or whatever) to be scrolled per
wheel action. Defaults to three.
*/
int GetLinesPerAction() const;
/**
Returns the logical mouse position in pixels (i.e. translated according to the
translation set for the DC, which usually indicates that the window has been
scrolled).
*/
wxPoint GetLogicalPosition(const wxDC& dc) const;
//@{
/**
Sets *x and *y to the position at which the event occurred.
Returns the physical mouse position in pixels.
Note that if the mouse event has been artificially generated from a special
keyboard combination (e.g. under Windows when the "menu'' key is pressed), the
returned position is @c wxDefaultPosition.
*/
wxPoint GetPosition() const;
const void GetPosition(wxCoord* x, wxCoord* y) const;
const void GetPosition(long* x, long* y) const;
//@}
/**
Get wheel delta, normally 120. This is the threshold for action to be
taken, and one such action (for example, scrolling one increment)
should occur for each delta.
*/
int GetWheelDelta() const;
/**
Get wheel rotation, positive or negative indicates direction of
rotation. Current devices all send an event when rotation is at least
+/-WheelDelta, but finer resolution devices can be created in the future.
Because of this you shouldn't assume that one event is equal to 1 line, but you
should be able to either do partial line scrolling or wait until several
events accumulate before scrolling.
*/
int GetWheelRotation() const;
/**
Returns X coordinate of the physical mouse event position.
*/
wxCoord GetX() const;
/**
Returns Y coordinate of the physical mouse event position.
*/
wxCoord GetY() const;
/**
Returns @true if the event was a mouse button event (not necessarily a button
down event -
that may be tested using @e ButtonDown).
*/
bool IsButton() const;
/**
Returns @true if the system has been setup to do page scrolling with
the mouse wheel instead of line scrolling.
*/
bool IsPageScroll() const;
/**
Returns @true if the mouse was leaving the window.
See also Entering().
*/
bool Leaving() const;
/**
Returns @true if the event was a left double click.
*/
bool LeftDClick() const;
/**
Returns @true if the left mouse button changed to down.
*/
bool LeftDown() const;
/**
Returns @true if the left mouse button is currently down, independent
of the current event type.
Please notice that it is not the same as
LeftDown() which returns @true if the event was
generated by the left mouse button being pressed. Rather, it simply describes
the state of the left mouse button at the time when the event was generated
(so while it will be @true for a left click event, it can also be @true for
a right click if it happened while the left mouse button was pressed).
This event is usually used in the mouse event handlers which process "move
mouse" messages to determine whether the user is (still) dragging the mouse.
*/
bool LeftIsDown() const;
/**
Returns @true if the left mouse button changed to up.
*/
bool LeftUp() const;
/**
Returns @true if the Meta key was down at the time of the event.
*/
bool MetaDown() const;
/**
Returns @true if the event was a middle double click.
*/
bool MiddleDClick() const;
/**
Returns @true if the middle mouse button changed to down.
*/
bool MiddleDown() const;
/**
Returns @true if the middle mouse button is currently down, independent
of the current event type.
*/
bool MiddleIsDown() const;
/**
Returns @true if the middle mouse button changed to up.
*/
bool MiddleUp() const;
/**
Returns @true if this was a motion event and no mouse buttons were pressed.
If any mouse button is held pressed, then this method returns @false and
Dragging() returns @true.
*/
bool Moving() const;
/**
Returns @true if the event was a right double click.
*/
bool RightDClick() const;
/**
Returns @true if the right mouse button changed to down.
*/
bool RightDown() const;
/**
Returns @true if the right mouse button is currently down, independent
of the current event type.
*/
bool RightIsDown() const;
/**
Returns @true if the right mouse button changed to up.
*/
bool RightUp() const;
/**
Returns @true if the shift key was down at the time of the event.
*/
bool ShiftDown() const;
/**
bool m_altDown
@true if the Alt key is pressed down.
*/
/**
bool m_controlDown
@true if control key is pressed down.
*/
/**
bool m_leftDown
@true if the left mouse button is currently pressed down.
*/
/**
int m_linesPerAction
The configured number of lines (or whatever) to be scrolled per wheel
action.
*/
/**
bool m_metaDown
@true if the Meta key is pressed down.
*/
/**
bool m_middleDown
@true if the middle mouse button is currently pressed down.
*/
/**
bool m_rightDown
@true if the right mouse button is currently pressed down.
*/
/**
bool m_shiftDown
@true if shift is pressed down.
*/
/**
int m_wheelDelta
The wheel delta, normally 120.
*/
/**
int m_wheelRotation
The distance the mouse wheel is rotated.
*/
/**
long m_x
X-coordinate of the event.
*/
/**
long m_y
Y-coordinate of the event.
*/
};
/**
@class wxDropFilesEvent
@wxheader{event.h}
This class is used for drop files events, that is, when files have been dropped
onto the window. This functionality is currently only available under Windows.
The window must have previously been enabled for dropping by calling
wxWindow::DragAcceptFiles.
Important note: this is a separate implementation to the more general
drag and drop implementation documented here(). It uses the
older, Windows message-based approach of dropping files.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxDropFilesEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxDropFilesEvent(wxEventType id = 0, int noFiles = 0,
wxString* files = NULL);
/**
Returns an array of filenames.
*/
wxString* GetFiles() const;
/**
Returns the number of files dropped.
*/
int GetNumberOfFiles() const;
/**
Returns the position at which the files were dropped.
Returns an array of filenames.
*/
wxPoint GetPosition() const;
/**
wxString* m_files
An array of filenames.
*/
/**
int m_noFiles
The number of files dropped.
*/
/**
wxPoint m_pos
The point at which the drop took place.
*/
};
/**
@class wxCommandEvent
@wxheader{event.h}
This event class contains information about command events, which originate
from a variety of
simple controls. More complex controls, such as wxTreeCtrl, have separate
command event classes.
@library{wxcore}
@category{events}
*/
class wxCommandEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxCommandEvent(wxEventType commandEventType = 0, int id = 0);
/**
Deprecated, use IsChecked() instead.
*/
bool Checked() const;
/**
Returns client data pointer for a listbox or choice selection event
(not valid for a deselection).
*/
void* GetClientData() const;
/**
Returns client object pointer for a listbox or choice selection event
(not valid for a deselection).
*/
wxClientData* GetClientObject() const;
/**
Returns extra information dependant on the event objects type.
If the event comes from a listbox selection, it is a boolean
determining whether the event was a selection (@true) or a
deselection (@false). A listbox deselection only occurs for
multiple-selection boxes, and in this case the index and string values
are indeterminate and the listbox must be examined by the application.
*/
long GetExtraLong() const;
/**
Returns the integer identifier corresponding to a listbox, choice or
radiobox selection (only if the event was a selection, not a
deselection), or a boolean value representing the value of a checkbox.
*/
int GetInt() const;
/**
Returns item index for a listbox or choice selection event (not valid for
a deselection).
*/
int GetSelection() const;
/**
Returns item string for a listbox or choice selection event (not valid for
a deselection).
*/
wxString GetString() const;
/**
This method can be used with checkbox and menu events: for the checkboxes, the
method returns @true for a selection event and @false for a
deselection one. For the menu events, this method indicates if the menu item
just has become checked or unchecked (and thus only makes sense for checkable
menu items).
Notice that this method can not be used with
wxCheckListBox currently.
*/
bool IsChecked() const;
/**
For a listbox or similar event, returns @true if it is a selection, @false if it
is a deselection.
*/
bool IsSelection() const;
/**
Sets the client data for this event.
*/
void SetClientData(void* clientData);
/**
Sets the client object for this event. The client object is not owned by the
event
object and the event object will not delete the client object in its destructor.
The client object must be owned and deleted by another object (e.g. a control)
that has longer life time than the event object.
*/
void SetClientObject(wxClientData* clientObject);
/**
Sets the @b m_extraLong member.
*/
void SetExtraLong(long extraLong);
/**
Sets the @b m_commandInt member.
*/
void SetInt(int intCommand);
/**
Sets the @b m_commandString member.
*/
void SetString(const wxString& string);
};
/**
@class wxActivateEvent
@wxheader{event.h}
An activate event is sent when a window or application is being activated
or deactivated.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling, wxApp::IsActive
*/
class wxActivateEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxActivateEvent(wxEventType eventType = wxEVT_NULL, bool active = true,
int id = 0);
/**
Returns @true if the application or window is being activated, @false otherwise.
*/
bool GetActive() const;
};
/**
@class wxContextMenuEvent
@wxheader{event.h}
This class is used for context menu events, sent to give
the application a chance to show a context (popup) menu.
Note that if wxContextMenuEvent::GetPosition returns wxDefaultPosition, this
means that the event originated
from a keyboard context button event, and you should compute a suitable
position yourself,
for example by calling wxGetMousePosition().
When a keyboard context menu button is pressed on Windows, a right-click event
with default position is sent first,
and if this event is not processed, the context menu event is sent. So if you
process mouse events and you find your context menu event handler
is not being called, you could call wxEvent::Skip for mouse right-down events.
@library{wxcore}
@category{events}
@see @ref overview_wxcommandevent "Command events", @ref
overview_eventhandling
*/
class wxContextMenuEvent : public wxCommandEvent
{
public:
/**
Constructor.
*/
wxContextMenuEvent(wxEventType id = 0, int id = 0,
const wxPoint& pos = wxDefaultPosition);
/**
Returns the position in screen coordinates at which the menu should be shown.
Use wxWindow::ScreenToClient to
convert to client coordinates. You can also omit a position from
wxWindow::PopupMenu in order to use
the current mouse pointer position.
If the event originated from a keyboard event, the value returned from this
function will be wxDefaultPosition.
*/
const wxPoint& GetPosition() const;
/**
Sets the position at which the menu should be shown.
*/
void SetPosition(const wxPoint& point);
};
/**
@class wxEraseEvent
@wxheader{event.h}
An erase event is sent when a window's background needs to be repainted.
On some platforms, such as GTK+, this event is simulated (simply generated just
before the
paint event) and may cause flicker. It is therefore recommended that
you set the text background colour explicitly in order to prevent flicker.
The default background colour under GTK+ is grey.
To intercept this event, use the EVT_ERASE_BACKGROUND macro in an event table
definition.
You must call wxEraseEvent::GetDC and use the returned device context if it is
non-@NULL.
If it is @NULL, create your own temporary wxClientDC object.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxEraseEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxEraseEvent(int id = 0, wxDC* dc = NULL);
/**
Returns the device context associated with the erase event to draw on.
*/
wxDC* GetDC() const;
};
/**
@class wxFocusEvent
@wxheader{event.h}
A focus event is sent when a window's focus changes. The window losing focus
receives a "kill focus'' event while the window gaining it gets a "set
focus'' one.
Notice that the set focus event happens both when the user gives focus to the
window (whether using the mouse or keyboard) and when it is done from the
program itself using wxWindow::SetFocus.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxFocusEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxFocusEvent(wxEventType eventType = 0, int id = 0);
/**
Returns the window associated with this event, that is the window which had the
focus before for the @c wxEVT_SET_FOCUS event and the window which is
going to receive focus for the @c wxEVT_KILL_FOCUS one.
Warning: the window pointer may be @NULL!
*/
};
/**
@class wxChildFocusEvent
@wxheader{event.h}
A child focus event is sent to a (parent-)window when one of its child windows
gains focus,
so that the window could restore the focus back to its corresponding child
if it loses it now and regains later.
Notice that child window is the direct child of the window receiving event.
Use wxWindow::FindFocus to retreive the window which is actually getting focus.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxChildFocusEvent : public wxCommandEvent
{
public:
/**
Constructor.
@param win
The direct child which is (or which contains the window which is) receiving
the focus.
*/
wxChildFocusEvent(wxWindow* win = NULL);
/**
Returns the direct child which receives the focus, or a (grand-)parent of the
control receiving the focus.
To get the actually focused control use wxWindow::FindFocus.
*/
};
/**
@class wxMouseCaptureLostEvent
@wxheader{event.h}
An mouse capture lost event is sent to a window that obtained mouse capture,
which was subsequently loss due to "external" event, for example when a dialog
box is shown or if another application captures the mouse.
If this happens, this event is sent to all windows that are on capture stack
(i.e. called CaptureMouse, but didn't call ReleaseMouse yet). The event is
not sent if the capture changes because of a call to CaptureMouse or
ReleaseMouse.
This event is currently emitted under Windows only.
@library{wxcore}
@category{events}
@see wxMouseCaptureChangedEvent, @ref overview_eventhandling,
wxWindow::CaptureMouse, wxWindow::ReleaseMouse, wxWindow::GetCapture
*/
class wxMouseCaptureLostEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxMouseCaptureLostEvent(wxWindowID windowId = 0);
};
/**
@class wxNotifyEvent
@wxheader{event.h}
This class is not used by the event handlers by itself, but is a base class
for other event classes (such as wxNotebookEvent).
It (or an object of a derived class) is sent when the controls state is being
changed and allows the program to wxNotifyEvent::Veto this
change if it wants to prevent it from happening.
@library{wxcore}
@category{events}
@see wxNotebookEvent
*/
class wxNotifyEvent : public wxCommandEvent
{
public:
/**
Constructor (used internally by wxWidgets only).
*/
wxNotifyEvent(wxEventType eventType = wxEVT_NULL, int id = 0);
/**
This is the opposite of Veto(): it explicitly
allows the event to be processed. For most events it is not necessary to call
this method as the events are allowed anyhow but some are forbidden by default
(this will be mentioned in the corresponding event description).
*/
void Allow();
/**
Returns @true if the change is allowed (Veto()
hasn't been called) or @false otherwise (if it was).
*/
bool IsAllowed() const;
/**
Prevents the change announced by this event from happening.
It is in general a good idea to notify the user about the reasons for vetoing
the change because otherwise the applications behaviour (which just refuses to
do what the user wants) might be quite surprising.
*/
void Veto();
};
/**
@class wxHelpEvent
@wxheader{event.h}
A help event is sent when the user has requested context-sensitive help.
This can either be caused by the application requesting
context-sensitive help mode via wxContextHelp, or
(on MS Windows) by the system generating a WM_HELP message when the user
pressed F1 or clicked
on the query button in a dialog caption.
A help event is sent to the window that the user clicked on, and is propagated
up the
window hierarchy until the event is processed or there are no more event
handlers.
The application should call wxEvent::GetId to check the identity of the
clicked-on window,
and then either show some suitable help or call wxEvent::Skip if the identifier
is unrecognised.
Calling Skip is important because it allows wxWidgets to generate further
events for ancestors
of the clicked-on window. Otherwise it would be impossible to show help for
container windows,
since processing would stop after the first window found.
@library{wxcore}
@category{events}
@see wxContextHelp, wxDialog, @ref overview_eventhandling
*/
class wxHelpEvent : public wxCommandEvent
{
public:
// how was this help event generated?
enum Origin
{
Origin_Unknown, // unrecognized event source
Origin_Keyboard, // event generated from F1 key press
Origin_HelpButton // event from [?] button on the title bar (Windows)
};
/**
Constructor.
*/
wxHelpEvent(wxEventType type = wxEVT_NULL,
wxWindowID winid = 0,
const wxPoint& pt = wxDefaultPosition,
Origin origin = Origin_Unknown);
/**
Returns the origin of the help event which is one of the following values:
@b Origin_Unknown
Unrecognized event source.
@b Origin_Keyboard
Event generated by @c F1 key press.
@b Origin_HelpButton
Event generated by
wxContextHelp or using the "?" title bur button under
MS Windows.
The application may handle events generated using the keyboard or mouse
differently, e.g. by using wxGetMousePosition()
for the mouse events.
@see SetOrigin()
*/
Origin GetOrigin() const;
/**
Returns the left-click position of the mouse, in screen coordinates. This allows
the application to position the help appropriately.
*/
const wxPoint& GetPosition() const;
/**
Set the help event origin, only used internally by wxWidgets normally.
@see GetOrigin()
*/
void SetOrigin(Origin);
/**
Sets the left-click position of the mouse, in screen coordinates.
*/
void SetPosition(const wxPoint& pt);
};
/**
@class wxScrollEvent
@wxheader{event.h}
A scroll event holds information about events sent from stand-alone
scrollbars() and sliders(). Note that
starting from wxWidgets 2.1, scrolled windows send the
wxScrollWinEvent which does not derive from
wxCommandEvent, but from wxEvent directly - don't confuse these two kinds of
events and use the event table macros mentioned below only for the
scrollbar-like controls.
@library{wxcore}
@category{events}
@see wxScrollBar, wxSlider, wxSpinButton, , wxScrollWinEvent, @ref
overview_eventhandling
*/
class wxScrollEvent : public wxCommandEvent
{
public:
/**
Constructor.
*/
wxScrollEvent(wxEventType commandType = 0, int id = 0, int pos = 0,
int orientation = 0);
/**
Returns wxHORIZONTAL or wxVERTICAL, depending on the orientation of the
scrollbar.
*/
int GetOrientation() const;
/**
Returns the position of the scrollbar.
*/
int GetPosition() const;
};
/**
@class wxIdleEvent
@wxheader{event.h}
This class is used for idle events, which are generated when the system becomes
idle. Note that, unless you do something specifically, the idle events are not
sent if the system remains idle once it has become it, e.g. only a single idle
event will be generated until something else resulting in more normal events
happens and only then is the next idle event sent again. If you need to ensure
a continuous stream of idle events, you can either use
wxIdleEvent::RequestMore method in your handler or call
wxWakeUpIdle() periodically (for example from timer
event), but note that both of these approaches (and especially the first one)
increase the system load and so should be avoided if possible.
By default, idle events are sent to all windows (and also
wxApp, as usual). If this is causing a significant
overhead in your application, you can call wxIdleEvent::SetMode with
the value wxIDLE_PROCESS_SPECIFIED, and set the wxWS_EX_PROCESS_IDLE extra
window style for every window which should receive idle events.
@library{wxbase}
@category{events}
@see @ref overview_eventhandling, wxUpdateUIEvent,
wxWindow::OnInternalIdle
*/
class wxIdleEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxIdleEvent();
/**
Returns @true if it is appropriate to send idle events to
this window.
This function looks at the mode used (see wxIdleEvent::SetMode),
and the wxWS_EX_PROCESS_IDLE style in @a window to determine whether idle
events should be sent to
this window now. By default this will always return @true because
the update mode is initially wxIDLE_PROCESS_ALL. You can change the mode
to only send idle events to windows with the wxWS_EX_PROCESS_IDLE extra window
style set.
@see SetMode()
*/
static bool CanSend(wxWindow* window);
/**
Static function returning a value specifying how wxWidgets
will send idle events: to all windows, or only to those which specify that they
will process the events.
See SetMode().
*/
static wxIdleMode GetMode();
/**
Returns @true if the OnIdle function processing this event requested more
processing time.
@see RequestMore()
*/
bool MoreRequested() const;
/**
Tells wxWidgets that more processing is required. This function can be called
by an OnIdle
handler for a window or window event handler to indicate that wxApp::OnIdle
should
forward the OnIdle event once more to the application windows. If no window
calls this function
during OnIdle, then the application will remain in a passive event loop (not
calling OnIdle) until a
new event is posted to the application by the windowing system.
@see MoreRequested()
*/
void RequestMore(bool needMore = true);
/**
Static function for specifying how wxWidgets will send idle events: to
all windows, or only to those which specify that they
will process the events.
@a mode can be one of the following values.
The default is wxIDLE_PROCESS_ALL.
*/
static void SetMode(wxIdleMode mode);
};
/**
@class wxInitDialogEvent
@wxheader{event.h}
A wxInitDialogEvent is sent as a dialog or panel is being initialised.
Handlers for this event can transfer data to the window.
The default handler calls wxWindow::TransferDataToWindow.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling
*/
class wxInitDialogEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxInitDialogEvent(int id = 0);
};
/**
@class wxWindowDestroyEvent
@wxheader{event.h}
This event is sent from the wxWindow destructor wxWindow::~wxWindow() when a
window is destroyed.
When a class derived from wxWindow is destroyed its destructor will have
already run by the time this event is sent. Therefore this event will not
usually be received at all.
To receive this event wxEvtHandler::Connect
must be used (using an event table macro will not work). Since it is
received after the destructor has run, an object should not handle its
own wxWindowDestroyEvent, but it can be used to get notification of the
destruction of another window.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling, wxWindowCreateEvent
*/
class wxWindowDestroyEvent : public wxCommandEvent
{
public:
/**
Constructor.
*/
wxWindowDestroyEvent(wxWindow* win = NULL);
};
/**
@class wxNavigationKeyEvent
@wxheader{event.h}
This event class contains information about navigation events,
generated by navigation keys such as tab and page down.
This event is mainly used by wxWidgets implementations. A
wxNavigationKeyEvent handler is automatically provided by wxWidgets
when you make a class into a control container with the macro
WX_DECLARE_CONTROL_CONTAINER.
@library{wxcore}
@category{events}
@see wxWindow::Navigate, wxWindow::NavigateIn
*/
class wxNavigationKeyEvent
{
public:
//@{
/**
Constructor.
*/
wxNavigationKeyEvent();
wxNavigationKeyEvent(const wxNavigationKeyEvent& event);
//@}
/**
Returns the child that has the focus, or @NULL.
*/
wxWindow* GetCurrentFocus() const;
/**
Returns @true if the navigation was in the forward direction.
*/
bool GetDirection() const;
/**
Returns @true if the navigation event was from a tab key. This is required
for proper navigation over radio buttons.
*/
bool IsFromTab() const;
/**
Returns @true if the navigation event represents a window change (for
example, from Ctrl-Page Down
in a notebook).
*/
bool IsWindowChange() const;
/**
Sets the current focus window member.
*/
void SetCurrentFocus(wxWindow* currentFocus);
/**
Sets the direction to forward if @a direction is @true, or backward if @c
@false.
*/
void SetDirection(bool direction);
/**
Sets the flags.
*/
void SetFlags(long flags);
/**
Marks the navigation event as from a tab key.
*/
void SetFromTab(bool fromTab);
/**
Marks the event as a window change event.
*/
void SetWindowChange(bool windowChange);
};
/**
@class wxMouseCaptureChangedEvent
@wxheader{event.h}
An mouse capture changed event is sent to a window that loses its
mouse capture. This is called even if wxWindow::ReleaseCapture
was called by the application code. Handling this event allows
an application to cater for unexpected capture releases which
might otherwise confuse mouse handling code.
This event is implemented under Windows only.
@library{wxcore}
@category{events}
@see wxMouseCaptureLostEvent, @ref overview_eventhandling,
wxWindow::CaptureMouse, wxWindow::ReleaseMouse, wxWindow::GetCapture
*/
class wxMouseCaptureChangedEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxMouseCaptureChangedEvent(wxWindowID windowId = 0,
wxWindow* gainedCapture = NULL);
/**
Returns the window that gained the capture, or @NULL if it was a non-wxWidgets
window.
*/
wxWindow* GetCapturedWindow() const;
};
/**
@class wxCloseEvent
@wxheader{event.h}
This event class contains information about window and session close events.
The handler function for EVT_CLOSE is called when the user has tried to close a
a frame
or dialog box using the window manager (X) or system menu (Windows). It can
also be invoked by the application itself programmatically, for example by
calling the wxWindow::Close function.
You should check whether the application is forcing the deletion of the window
using wxCloseEvent::CanVeto. If this is @false,
you @e must destroy the window using wxWindow::Destroy.
If the return value is @true, it is up to you whether you respond by destroying
the window.
If you don't destroy the window, you should call wxCloseEvent::Veto to
let the calling code know that you did not destroy the window. This allows the
wxWindow::Close function
to return @true or @false depending on whether the close instruction was
honoured or not.
@library{wxcore}
@category{events}
@see wxWindow::Close, @ref overview_windowdeletionoverview "Window deletion
overview"
*/
class wxCloseEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxCloseEvent(wxEventType commandEventType = 0, int id = 0);
/**
Returns @true if you can veto a system shutdown or a window close event.
Vetoing a window close event is not possible if the calling code wishes to
force the application to exit, and so this function must be called to check
this.
*/
bool CanVeto() const;
/**
Returns @true if the user is just logging off or @false if the system is
shutting down. This method can only be called for end session and query end
session events, it doesn't make sense for close window event.
*/
bool GetLoggingOff() const;
/**
Sets the 'can veto' flag.
*/
void SetCanVeto(bool canVeto);
/**
Sets the 'force' flag.
*/
void SetForce(bool force) const;
/**
Sets the 'logging off' flag.
*/
void SetLoggingOff(bool loggingOff);
/**
Call this from your event handler to veto a system shutdown or to signal
to the calling application that a window close did not happen.
You can only veto a shutdown if CanVeto() returns
@true.
*/
void Veto(bool veto = true);
};
/**
@class wxMenuEvent
@wxheader{event.h}
This class is used for a variety of menu-related events. Note that
these do not include menu command events, which are
handled using wxCommandEvent objects.
The default handler for wxEVT_MENU_HIGHLIGHT displays help
text in the first field of the status bar.
@library{wxcore}
@category{events}
@see @ref overview_wxcommandevent "Command events", @ref
overview_eventhandling
*/
class wxMenuEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxMenuEvent(wxEventType id = 0, int id = 0, wxMenu* menu = NULL);
/**
Returns the menu which is being opened or closed. This method should only be
used with the @c OPEN and @c CLOSE events and even for them the
returned pointer may be @NULL in some ports.
*/
wxMenu* GetMenu() const;
/**
Returns the menu identifier associated with the event. This method should be
only used with the @c HIGHLIGHT events.
*/
int GetMenuId() const;
/**
Returns @true if the menu which is being opened or closed is a popup menu,
@false if it is a normal one.
This method should only be used with the @c OPEN and @c CLOSE events.
*/
bool IsPopup() const;
};
/**
@class wxEventBlocker
@wxheader{event.h}
This class is a special event handler which allows to discard
any event (or a set of event types) directed to a specific window.
Example:
@code
{
// block all events directed to this window while
// we do the 1000 FuncWhichSendsEvents() calls
wxEventBlocker blocker(this);
for ( int i = 0; i 1000; i++ )
FuncWhichSendsEvents(i);
} // ~wxEventBlocker called, old event handler is restored
// the event generated by this call will be processed
FuncWhichSendsEvents(0)
@endcode
@library{wxcore}
@category{events}
@see @ref overview_eventhandling, wxEvtHandler
*/
class wxEventBlocker : public wxEvtHandler
{
public:
/**
Constructs the blocker for the given window and for the given event type.
If @a type is @c wxEVT_ANY, then all events for that window are
blocked. You can call Block() after creation to
add other event types to the list of events to block.
Note that the @a win window @b must remain alive until the
wxEventBlocker object destruction.
*/
wxEventBlocker(wxWindow* win, wxEventType = -0x000000001);
/**
Destructor. The blocker will remove itself from the chain of event handlers for
the window provided in the constructor, thus restoring normal processing of
events.
*/
virtual ~wxEventBlocker();
/**
Adds to the list of event types which should be blocked the given @e eventType.
*/
void Block(wxEventType eventType);
};
/**
@class wxEvtHandler
@wxheader{event.h}
A class that can handle events from the windowing system.
wxWindow (and therefore all window classes) are derived from
this class.
When events are received, wxEvtHandler invokes the method listed in the
event table using itself as the object. When using multiple inheritance
it is imperative that the wxEvtHandler(-derived) class be the first
class inherited such that the "this" pointer for the overall object
will be identical to the "this" pointer for the wxEvtHandler portion.
@library{wxbase}
@category{events}
@see @ref overview_eventhandling
*/
class wxEvtHandler : public wxObject
{
public:
/**
Constructor.
*/
wxEvtHandler();
/**
Destructor. If the handler is part of a chain, the destructor will
unlink itself and restore the previous and next handlers so that they point to
each other.
*/
virtual ~wxEvtHandler();
/**
This function posts an event to be processed later.
@param event
Event to add to process queue.
@remarks The difference between sending an event (using the ProcessEvent
method) and posting it is that in the first case the
event is processed before the function returns, while
in the second case, the function returns immediately
and the event will be processed sometime later (usually
during the next event loop iteration).
*/
virtual void AddPendingEvent(const wxEvent& event);
//@{
/**
Connects the given function dynamically with the event handler, id and event
type. This
is an alternative to the use of static event tables. See the 'event' or the old
'dynamic' sample for usage.
@param id
The identifier (or first of the identifier range) to be
associated with the event handler function. For the version not taking this
argument, it defaults to wxID_ANY.
@param lastId
The second part of the identifier range to be associated with the event
handler function.
@param eventType
The event type to be associated with this event handler.
@param function
The event handler function. Note that this function should
be explicitly converted to the correct type which can be done using a macro
called wxFooEventHandler for the handler for any wxFooEvent.
@param userData
Data to be associated with the event table entry.
@param eventSink
Object whose member function should be called. If this is @NULL,
this will be used.
*/
void Connect(int id, int lastId, wxEventType eventType,
wxObjectEventFunction function,
wxObject* userData = NULL,
wxEvtHandler* eventSink = NULL);
void Connect(int id, wxEventType eventType,
wxObjectEventFunction function,
wxObject* userData = NULL,
wxEvtHandler* eventSink = NULL);
void Connect(wxEventType eventType,
wxObjectEventFunction function,
wxObject* userData = NULL,
wxEvtHandler* eventSink = NULL);
//@}
//@{
/**
Disconnects the given function dynamically from the event handler, using the
specified
parameters as search criteria and returning @true if a matching function has been
found and removed. This method can only disconnect functions which have been
added
using the Connect() method. There is no way
to disconnect functions connected using the (static) event tables.
@param id
The identifier (or first of the identifier range) associated with the event
handler function.
@param lastId
The second part of the identifier range associated with the event handler
function.
@param eventType
The event type associated with this event handler.
@param function
The event handler function.
@param userData
Data associated with the event table entry.
@param eventSink
Object whose member function should be called.
*/
bool Disconnect(wxEventType eventType = wxEVT_NULL,
wxObjectEventFunction function = NULL,
wxObject* userData = NULL,
wxEvtHandler* eventSink = NULL);
bool Disconnect(int id = wxID_ANY,
wxEventType eventType = wxEVT_NULL,
wxObjectEventFunction function = NULL,
wxObject* userData = NULL,
wxEvtHandler* eventSink = NULL);
bool Disconnect(int id, int lastId = wxID_ANY,
wxEventType eventType = wxEVT_NULL,
wxObjectEventFunction function = NULL,
wxObject* userData = NULL,
wxEvtHandler* eventSink = NULL);
//@}
/**
Gets user-supplied client data.
@remarks Normally, any extra data the programmer wishes to associate with
the object should be made available by deriving a new
class with new data members.
@see SetClientData()
*/
void* GetClientData() const;
/**
Get a pointer to the user-supplied client data object.
@see SetClientObject(), wxClientData
*/
wxClientData* GetClientObject() const;
/**
Returns @true if the event handler is enabled, @false otherwise.
@see SetEvtHandlerEnabled()
*/
bool GetEvtHandlerEnabled() const;
/**
Gets the pointer to the next handler in the chain.
@see SetNextHandler(), GetPreviousHandler(),
SetPreviousHandler(), wxWindow::PushEventHandler,
wxWindow::PopEventHandler
*/
wxEvtHandler* GetNextHandler() const;
/**
Gets the pointer to the previous handler in the chain.
@see SetPreviousHandler(), GetNextHandler(),
SetNextHandler(), wxWindow::PushEventHandler,
wxWindow::PopEventHandler
*/
wxEvtHandler* GetPreviousHandler() const;
/**
Processes an event, searching event tables and calling zero or more suitable
event handler function(s).
@param event
Event to process.
@returns @true if a suitable event handler function was found and
executed, and the function did not call wxEvent::Skip.
@remarks Normally, your application would not call this function: it is
called in the wxWidgets implementation to dispatch
incoming user interface events to the framework (and
application).
@see SearchEventTable()
*/
virtual bool ProcessEvent(wxEvent& event);
/**
Processes an event by calling ProcessEvent()
and handles any exceptions that occur in the process. If an exception is
thrown in event handler, wxApp::OnExceptionInMainLoop
is called.
@param event
Event to process.
@returns @true if the event was processed, @false if no handler was found
or an exception was thrown.
@see wxWindow::HandleWindowEvent
*/
bool SafelyProcessEvent(wxEvent& event);
/**
Searches the event table, executing an event handler function if an appropriate
one
is found.
@param table
Event table to be searched.
@param event
Event to be matched against an event table entry.
@returns @true if a suitable event handler function was found and
executed, and the function did not call wxEvent::Skip.
@remarks This function looks through the object's event table and tries
to find an entry that will match the event.
@see ProcessEvent()
*/
virtual bool SearchEventTable(wxEventTable& table,
wxEvent& event);
/**
Sets user-supplied client data.
@param data
Data to be associated with the event handler.
@remarks Normally, any extra data the programmer wishes to associate with
the object should be made available by deriving a new
class with new data members. You must not call this
method and SetClientObject on the same class - only one
of them.
@see GetClientData()
*/
void SetClientData(void* data);
/**
Set the client data object. Any previous object will be deleted.
@see GetClientObject(), wxClientData
*/
void SetClientObject(wxClientData* data);
/**
Enables or disables the event handler.
@param enabled
@true if the event handler is to be enabled, @false if it is to be disabled.
@remarks You can use this function to avoid having to remove the event
handler from the chain, for example when implementing a
dialog editor and changing from edit to test mode.
@see GetEvtHandlerEnabled()
*/
void SetEvtHandlerEnabled(bool enabled);
/**
Sets the pointer to the next handler.
@param handler
Event handler to be set as the next handler.
@see GetNextHandler(), SetPreviousHandler(),
GetPreviousHandler(), wxWindow::PushEventHandler,
wxWindow::PopEventHandler
*/
void SetNextHandler(wxEvtHandler* handler);
/**
Sets the pointer to the previous handler.
@param handler
Event handler to be set as the previous handler.
*/
void SetPreviousHandler(wxEvtHandler* handler);
};
/**
@class wxIconizeEvent
@wxheader{event.h}
An event being sent when the frame is iconized (minimized) or restored.
Currently only wxMSW and wxGTK generate such events.
@library{wxcore}
@category{events}
@see @ref overview_eventhandling, wxTopLevelWindow::Iconize,
wxTopLevelWindow::IsIconized
*/
class wxIconizeEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxIconizeEvent(int id = 0, bool iconized = true);
/**
Returns @true if the frame has been iconized, @false if it has been
restored.
*/
bool Iconized() const;
};
/**
@class wxMoveEvent
@wxheader{event.h}
A move event holds information about move change events.
@library{wxcore}
@category{events}
@see wxPoint, @ref overview_eventhandling
*/
class wxMoveEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxMoveEvent(const wxPoint& pt, int id = 0);
/**
Returns the position of the window generating the move change event.
*/
wxPoint GetPosition() const;
};
/**
@class wxEvent
@wxheader{event.h}
An event is a structure holding information about an event passed to a
callback or member function. @b wxEvent used to be a multipurpose
event object, and is an abstract base class for other event classes (see below).
For more information about events, see the @ref overview_eventhandling.
@b wxPerl note: In wxPerl custom event classes should be derived from
@c Wx::PlEvent and @c Wx::PlCommandEvent.
@library{wxbase}
@category{events}
@see wxCommandEvent, wxMouseEvent
*/
class wxEvent : public wxObject
{
public:
/**
Constructor. Should not need to be used directly by an application.
*/
wxEvent(int id = 0, wxEventType eventType = wxEVT_NULL);
/**
Returns a copy of the event.
Any event that is posted to the wxWidgets event system for later action (via
wxEvtHandler::AddPendingEvent or
wxPostEvent()) must implement this method. All wxWidgets
events fully implement this method, but any derived events implemented by the
user should also implement this method just in case they (or some event
derived from them) are ever posted.
All wxWidgets events implement a copy constructor, so the easiest way of
implementing the Clone function is to implement a copy constructor for
a new event (call it MyEvent) and then define the Clone function like this:
*/
virtual wxEvent* Clone() const = 0;
/**
Returns the object (usually a window) associated with the
event, if any.
*/
wxObject* GetEventObject() const;
/**
Returns the identifier of the given event type,
such as @c wxEVT_COMMAND_BUTTON_CLICKED.
*/
wxEventType GetEventType() const;
/**
Returns the identifier associated with this event, such as a button command id.
*/
int GetId() const;
/**
Returns @true if the event handler should be skipped, @false otherwise.
*/
bool GetSkipped() const;
/**
Gets the timestamp for the event. The timestamp is the time in milliseconds
since some fixed moment (not necessarily the standard Unix Epoch, so
only differences between the timestamps and not their absolute values usually
make sense).
*/
long GetTimestamp() const;
/**
Returns @true if the event is or is derived from
wxCommandEvent else it returns @false.
Note: Exists only for optimization purposes.
*/
bool IsCommandEvent() const;
/**
Sets the propagation level to the given value (for example returned from an
earlier call to wxEvent::StopPropagation).
*/
void ResumePropagation(int propagationLevel);
/**
Sets the originating object.
*/
void SetEventObject(wxObject* object);
/**
Sets the event type.
*/
void SetEventType(wxEventType type);
/**
Sets the identifier associated with this event, such as a button command id.
*/
void SetId(int id);
/**
Sets the timestamp for the event.
*/
void SetTimestamp(long = 0);
/**
Test if this event should be propagated or not, i.e. if the propagation level
is currently greater than 0.
*/
bool ShouldPropagate() const;
/**
This method can be used inside an event handler to control whether further
event handlers bound to this event will be called after the current one
returns. Without Skip() (or equivalently if Skip(@false) is used),
the event will not be processed any more. If Skip(@true) is called, the event
processing system continues searching for a further handler function for this
event, even though it has been processed already in the current handler.
In general, it is recommended to skip all non-command events to allow the
default handling to take place. The command events are, however, normally not
skipped as usually a single command such as a button click or menu item
selection must only be processed by one handler.
*/
void Skip(bool skip = true);
/**
Stop the event from propagating to its parent window.
Returns the old propagation level value which may be later passed to
ResumePropagation() to allow propagating the
event again.
*/
int StopPropagation();
/**
int m_propagationLevel
Indicates how many levels the event can propagate. This member is protected and
should typically only be set in the constructors of the derived classes. It
may be temporarily changed by StopPropagation()
and ResumePropagation() and tested with
ShouldPropagate().
The initial value is set to either @c wxEVENT_PROPAGATE_NONE (by
default) meaning that the event shouldn't be propagated at all or to
@c wxEVENT_PROPAGATE_MAX (for command events) meaning that it should be
propagated as much as necessary.
Any positive number means that the event should be propagated but no more than
the given number of times. E.g. the propagation level may be set to 1 to
propagate the event to its parent only, but not to its grandparent.
*/
};
/**
@class wxSizeEvent
@wxheader{event.h}
A size event holds information about size change events.
The EVT_SIZE handler function will be called when the window has been resized.
You may wish to use this for frames to resize their child windows as
appropriate.
Note that the size passed is of
the whole window: call wxWindow::GetClientSize for the area which may be
used by the application.
When a window is resized, usually only a small part of the window is damaged
and you
may only need to repaint that area. However, if your drawing depends on the
size of the window,
you may need to clear the DC explicitly and repaint the whole window. In which
case, you
may need to call wxWindow::Refresh to invalidate the entire window.
@library{wxcore}
@category{events}
@see wxSize, @ref overview_eventhandling
*/
class wxSizeEvent : public wxEvent
{
public:
/**
Constructor.
*/
wxSizeEvent(const wxSize& sz, int id = 0);
/**
Returns the entire size of the window generating the size change event.
*/
wxSize GetSize() const;
};
/**
@class wxSetCursorEvent
@wxheader{event.h}
A SetCursorEvent is generated when the mouse cursor is about to be set as a
result of mouse motion. This event gives the application the chance to perform
specific mouse cursor processing based on the current position of the mouse
within the window. Use wxSetCursorEvent::SetCursor to
specify the cursor you want to be displayed.
@library{wxcore}
@category{events}
@see ::wxSetCursor, wxWindow::wxSetCursor
*/
class wxSetCursorEvent : public wxEvent
{
public:
/**
Constructor, used by the library itself internally to initialize the event
object.
*/
wxSetCursorEvent(wxCoord x = 0, wxCoord y = 0);
/**
Returns a reference to the cursor specified by this event.
*/
const wxCursor& GetCursor() const;
/**
Returns the X coordinate of the mouse in client coordinates.
*/
wxCoord GetX() const;
/**
Returns the Y coordinate of the mouse in client coordinates.
*/
wxCoord GetY() const;
/**
Returns @true if the cursor specified by this event is a valid cursor.
@remarks You cannot specify wxNullCursor with this event, as it is not
considered a valid cursor.
*/
bool HasCursor() const;
/**
Sets the cursor associated with this event.
*/
void SetCursor(const wxCursor& cursor);
};
// ============================================================================
// Global functions/macros
// ============================================================================
/** @ingroup group_funcmacro_misc */
//@{
/**
In a GUI application, this function posts @a event to the specified @e dest
object using wxEvtHandler::AddPendingEvent().
Otherwise, it dispatches @a event immediately using
wxEvtHandler::ProcessEvent(). See the respective documentation for details
(and caveats).
@header{wx/event.h}
*/
void wxPostEvent(wxEvtHandler* dest, wxEvent& event);
//@}
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