wxWidgets/interface/wx/combo.h
2009-12-26 10:33:35 +00:00

828 lines
26 KiB
Objective-C

/////////////////////////////////////////////////////////////////////////////
// Name: combo.h
// Purpose: interface of wxComboCtrl and wxComboPopup
// Author: wxWidgets team
// RCS-ID: $Id$
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
/**
@class wxComboPopup
In order to use a custom popup with wxComboCtrl, an interface class must be
derived from wxComboPopup.
For more information on how to use it, see @ref comboctrl_custompopup.
@library{wxcore}
@category{ctrl}
@see wxComboCtrl
*/
class wxComboPopup
{
public:
/**
Default constructor. It is recommended that internal variables are
prepared in Init() instead (because m_combo is not valid in
constructor).
*/
wxComboPopup();
/**
The derived class must implement this to create the popup control.
@return @true if the call succeeded, @false otherwise.
*/
virtual bool Create(wxWindow* parent) = 0;
/**
Utility function that hides the popup.
*/
void Dismiss();
/**
The derived class may implement this to return adjusted size for the
popup control, according to the variables given.
@param minWidth
Preferred minimum width.
@param prefHeight
Preferred height. May be -1 to indicate no preference.
@param maxHeight
Max height for window, as limited by screen size.
@remarks This function is called each time popup is about to be shown.
*/
virtual wxSize GetAdjustedSize(int minWidth, int prefHeight, int maxHeight);
/**
Returns pointer to the associated parent wxComboCtrl.
*/
wxComboCtrl* GetComboCtrl() const;
/**
The derived class must implement this to return pointer to the
associated control created in Create().
*/
virtual wxWindow* GetControl() = 0;
/**
The derived class must implement this to return string representation
of the value.
*/
virtual wxString GetStringValue() const = 0;
/**
The derived class must implement this to initialize its internal
variables. This method is called immediately after construction
finishes. m_combo member variable has been initialized before the call.
*/
virtual void Init();
/**
Utility method that returns @true if Create has been called.
Useful in conjunction with LazyCreate().
*/
bool IsCreated() const;
/**
The derived class may implement this to return @true if it wants to
delay call to Create() until the popup is shown for the first time. It
is more efficient, but on the other hand it is often more convenient to
have the control created immediately.
@remarks Base implementation returns @false.
*/
virtual bool LazyCreate();
/**
The derived class may implement this to do something when the parent
wxComboCtrl gets double-clicked.
*/
virtual void OnComboDoubleClick();
/**
The derived class may implement this to receive key events from the
parent wxComboCtrl.
Events not handled should be skipped, as usual.
*/
virtual void OnComboKeyEvent(wxKeyEvent& event);
/**
The derived class may implement this to do special processing when
popup is hidden.
*/
virtual void OnDismiss();
/**
The derived class may implement this to do special processing when
popup is shown.
*/
virtual void OnPopup();
/**
The derived class may implement this to paint the parent wxComboCtrl.
Default implementation draws value as string.
*/
virtual void PaintComboControl(wxDC& dc, const wxRect& rect);
/**
The derived class must implement this to receive string value changes
from wxComboCtrl.
*/
virtual void SetStringValue(const wxString& value);
protected:
/**
Parent wxComboCtrl. This member variable is prepared automatically
before Init() is called.
*/
wxComboCtrl* m_combo;
};
/**
Features enabled for wxComboCtrl.
@see wxComboCtrl::GetFeatures()
*/
struct wxComboCtrlFeatures
{
enum
{
MovableButton = 0x0001, ///< Button can be on either side of control.
BitmapButton = 0x0002, ///< Button may be replaced with bitmap.
ButtonSpacing = 0x0004, ///< Button can have spacing from the edge
///< of the control.
TextIndent = 0x0008, ///< wxComboCtrl::SetMargins() can be used.
PaintControl = 0x0010, ///< Combo control itself can be custom painted.
PaintWritable = 0x0020, ///< A variable-width area in front of writable
///< combo control's textctrl can be custom
///< painted.
Borderless = 0x0040, ///< wxNO_BORDER window style works.
All = MovableButton | BitmapButton | ButtonSpacing |
TextIndent | PaintControl | PaintWritable |
Borderless ///< All features.
};
};
/**
@class wxComboCtrl
A combo control is a generic combobox that allows totally custom popup. In
addition it has other customization features. For instance, position and
size of the dropdown button can be changed.
@section comboctrl_custompopup Setting Custom Popup for wxComboCtrl
wxComboCtrl needs to be told somehow which control to use and this is done
by SetPopupControl(). However, we need something more than just a wxControl
in this method as, for example, we need to call
SetStringValue("initial text value") and wxControl doesn't have such
method. So we also need a wxComboPopup which is an interface which must be
implemented by a control to be usable as a popup.
We couldn't derive wxComboPopup from wxControl as this would make it
impossible to have a class deriving from a wxWidgets control and from it,
so instead it is just a mix-in.
Here's a minimal sample of wxListView popup:
@code
#include <wx/combo.h>
#include <wx/listctrl.h>
class wxListViewComboPopup : public wxListView, public wxComboPopup
{
public:
// Initialize member variables
virtual void Init()
{
m_value = -1;
}
// Create popup control
virtual bool Create(wxWindow* parent)
{
return wxListView::Create(parent,1,wxPoint(0,0),wxDefaultSize);
}
// Return pointer to the created control
virtual wxWindow *GetControl() { return this; }
// Translate string into a list selection
virtual void SetStringValue(const wxString& s)
{
int n = wxListView::FindItem(-1,s);
if ( n >= 0 && n < wxListView::GetItemCount() )
wxListView::Select(n);
}
// Get list selection as a string
virtual wxString GetStringValue() const
{
if ( m_value >= 0 )
return wxListView::GetItemText(m_value);
return wxEmptyString;
}
// Do mouse hot-tracking (which is typical in list popups)
void OnMouseMove(wxMouseEvent& event)
{
// TODO: Move selection to cursor
}
// On mouse left up, set the value and close the popup
void OnMouseClick(wxMouseEvent& WXUNUSED(event))
{
m_value = wxListView::GetFirstSelected();
// TODO: Send event as well
Dismiss();
}
protected:
int m_value; // current item index
private:
DECLARE_EVENT_TABLE()
};
BEGIN_EVENT_TABLE(wxListViewComboPopup, wxListView)
EVT_MOTION(wxListViewComboPopup::OnMouseMove)
EVT_LEFT_UP(wxListViewComboPopup::OnMouseClick)
END_EVENT_TABLE()
@endcode
Here's how you would create and populate it in a dialog constructor:
@code
wxComboCtrl* comboCtrl = new wxComboCtrl(this, wxID_ANY, wxEmptyString);
wxListViewComboPopup* popupCtrl = new wxListViewComboPopup();
// It is important to call SetPopupControl() as soon as possible
comboCtrl->SetPopupControl(popupCtrl);
// Populate using wxListView methods
popupCtrl->InsertItem(popupCtrl->GetItemCount(), "First Item");
popupCtrl->InsertItem(popupCtrl->GetItemCount(), "Second Item");
popupCtrl->InsertItem(popupCtrl->GetItemCount(), "Third Item");
@endcode
@beginStyleTable
@style{wxCB_READONLY}
Text will not be editable.
@style{wxCB_SORT}
Sorts the entries in the list alphabetically.
@style{wxTE_PROCESS_ENTER}
The control will generate the event wxEVT_COMMAND_TEXT_ENTER
(otherwise pressing Enter key is either processed internally by the
control or used for navigation between dialog controls). Windows
only.
@style{wxCC_SPECIAL_DCLICK}
Double-clicking triggers a call to popup's OnComboDoubleClick.
Actual behaviour is defined by a derived class. For instance,
wxOwnerDrawnComboBox will cycle an item. This style only applies if
wxCB_READONLY is used as well.
@style{wxCC_STD_BUTTON}
Drop button will behave more like a standard push button.
@endStyleTable
@beginEventEmissionTable{wxCommandEvent}
@event{EVT_TEXT(id, func)}
Process a wxEVT_COMMAND_TEXT_UPDATED event, when the text changes.
@event{EVT_TEXT_ENTER(id, func)}
Process a wxEVT_COMMAND_TEXT_ENTER event, when RETURN is pressed in
the combo control.
@event{EVT_COMBOBOX_DROPDOWN(id, func)}
Process a wxEVT_COMMAND_COMBOBOX_DROPDOWN event, which is generated
when the popup window is shown (drops down).
@event{EVT_COMBOBOX_CLOSEUP(id, func)}
Process a wxEVT_COMMAND_COMBOBOX_CLOSEUP event, which is generated
when the popup window of the combo control disappears (closes up).
You should avoid adding or deleting items in this event.
@endEventTable
@library{wxbase}
@category{ctrl}
@appearance{comboctrl.png}
@see wxComboBox, wxChoice, wxOwnerDrawnComboBox, wxComboPopup,
wxCommandEvent
*/
class wxComboCtrl : public wxControl
{
public:
/**
Default constructor.
*/
wxComboCtrl();
/**
Constructor, creating and showing a combo control.
@param parent
Parent window. Must not be @NULL.
@param id
Window identifier. The value wxID_ANY indicates a default value.
@param value
Initial selection string. An empty string indicates no selection.
@param pos
Window position.
If ::wxDefaultPosition is specified then a default position is chosen.
@param size
Window size.
If ::wxDefaultSize is specified then the window is sized appropriately.
@param style
Window style. See wxComboCtrl.
@param validator
Window validator.
@param name
Window name.
@see Create(), wxValidator
*/
wxComboCtrl(wxWindow* parent, wxWindowID id = wxID_ANY,
const wxString& value = wxEmptyString,
const wxPoint& pos = wxDefaultPosition,
const wxSize& size = wxDefaultSize,
long style = 0,
const wxValidator& validator = wxDefaultValidator,
const wxString& name = wxComboBoxNameStr);
/**
Destructor, destroying the combo control.
*/
virtual ~wxComboCtrl();
/**
Copies the selected text to the clipboard.
*/
virtual void Copy();
/**
Creates the combo control for two-step construction. Derived classes
should call or replace this function. See wxComboCtrl() for further
details.
*/
bool Create(wxWindow* parent, wxWindowID id = wxID_ANY,
const wxString& value = wxEmptyString,
const wxPoint& pos = wxDefaultPosition,
const wxSize& size = wxDefaultSize,
long style = 0,
const wxValidator& validator = wxDefaultValidator,
const wxString& name = wxComboBoxNameStr);
/**
Copies the selected text to the clipboard and removes the selection.
*/
virtual void Cut();
/**
Enables or disables popup animation, if any, depending on the value of
the argument.
*/
void EnablePopupAnimation(bool enable = true);
/**
Returns disabled button bitmap that has been set with
SetButtonBitmaps().
@return A reference to the disabled state bitmap.
*/
const wxBitmap& GetBitmapDisabled() const;
/**
Returns button mouse hover bitmap that has been set with
SetButtonBitmaps().
@return A reference to the mouse hover state bitmap.
*/
const wxBitmap& GetBitmapHover() const;
/**
Returns default button bitmap that has been set with
SetButtonBitmaps().
@return A reference to the normal state bitmap.
*/
const wxBitmap& GetBitmapNormal() const;
/**
Returns depressed button bitmap that has been set with
SetButtonBitmaps().
@return A reference to the depressed state bitmap.
*/
const wxBitmap& GetBitmapPressed() const;
/**
Returns current size of the dropdown button.
*/
wxSize GetButtonSize();
/**
Returns custom painted area in control.
@see SetCustomPaintWidth().
*/
int GetCustomPaintWidth() const;
/**
Returns features supported by wxComboCtrl. If needed feature is
missing, you need to instead use wxGenericComboCtrl, which however may
lack a native look and feel (but otherwise sports identical API).
@return Value returned is a combination of the flags defined in
wxComboCtrlFeatures.
*/
static int GetFeatures();
/**
Returns the current hint string.
See SetHint() for more information about hints.
@since 2.9.1
*/
virtual wxString GetHint() const;
/**
Returns the insertion point for the combo control's text field.
@note Under Windows, this function always returns 0 if the combo
control doesn't have the focus.
*/
virtual long GetInsertionPoint() const;
/**
Returns the last position in the combo control text field.
*/
virtual long GetLastPosition() const;
/**
Returns the margins used by the control. The @c x field of the returned
point is the horizontal margin and the @c y field is the vertical one.
@remarks If given margin cannot be accurately determined, its value
will be set to -1.
@see SetMargins()
@since 2.9.1
*/
wxPoint GetMargins() const;
/**
Returns current popup interface that has been set with
SetPopupControl().
*/
wxComboPopup* GetPopupControl();
/**
Returns popup window containing the popup control.
*/
wxWindow* GetPopupWindow() const;
/**
Get the text control which is part of the combo control.
*/
wxTextCtrl* GetTextCtrl() const;
/**
Returns actual indentation in pixels.
@deprecated Use GetMargins() instead.
*/
wxCoord GetTextIndent() const;
/**
Returns area covered by the text field (includes everything except
borders and the dropdown button).
*/
const wxRect& GetTextRect() const;
/**
Returns text representation of the current value. For writable combo
control it always returns the value in the text field.
*/
virtual wxString GetValue() const;
/**
Dismisses the popup window.
@param generateEvent
Set this to @true in order to generate
wxEVT_COMMAND_COMBOBOX_CLOSEUP event.
*/
virtual void HidePopup(bool generateEvent=false);
/**
Returns @true if the popup is currently shown
*/
bool IsPopupShown() const;
/**
Returns @true if the popup window is in the given state. Possible
values are:
@beginTable
@row2col{wxComboCtrl::Hidden, Popup window is hidden.}
@row2col{wxComboCtrl::Animating, Popup window is being shown, but the
popup animation has not yet finished.}
@row2col{wxComboCtrl::Visible, Popup window is fully visible.}
@endTable
*/
bool IsPopupWindowState(int state) const;
/**
Implement in a derived class to define what happens on dropdown button
click. Default action is to show the popup.
@note If you implement this to do something else than show the popup,
you must then also implement DoSetPopupControl() to always return
@NULL.
*/
virtual void OnButtonClick();
/**
Pastes text from the clipboard to the text field.
*/
virtual void Paste();
/**
Removes the text between the two positions in the combo control text
field.
@param from
The first position.
@param to
The last position.
*/
virtual void Remove(long from, long to);
/**
Replaces the text between two positions with the given text, in the
combo control text field.
@param from
The first position.
@param to
The second position.
@param text
The text to insert.
*/
virtual void Replace(long from, long to, const wxString& text);
/**
Sets custom dropdown button graphics.
@param bmpNormal
Default button image.
@param pushButtonBg
If @true, blank push button background is painted below the image.
@param bmpPressed
Depressed button image.
@param bmpHover
Button image when mouse hovers above it. This should be ignored on
platforms and themes that do not generally draw different kind of
button on mouse hover.
@param bmpDisabled
Disabled button image.
*/
void SetButtonBitmaps(const wxBitmap& bmpNormal,
bool pushButtonBg = false,
const wxBitmap& bmpPressed = wxNullBitmap,
const wxBitmap& bmpHover = wxNullBitmap,
const wxBitmap& bmpDisabled = wxNullBitmap);
/**
Sets size and position of dropdown button.
@param width
Button width. Value = 0 specifies default.
@param height
Button height. Value = 0 specifies default.
@param side
Indicates which side the button will be placed. Value can be wxLEFT
or wxRIGHT.
@param spacingX
Horizontal spacing around the button. Default is 0.
*/
void SetButtonPosition(int width = -1, int height = -1,
int side = wxRIGHT, int spacingX = 0);
/**
Set width, in pixels, of custom painted area in control without
@c wxCB_READONLY style. In read-only wxOwnerDrawnComboBox, this is used
to indicate area that is not covered by the focus rectangle.
*/
void SetCustomPaintWidth(int width);
/**
Sets a hint shown in an empty unfocused combo control.
Notice that hints are known as <em>cue banners</em> under MSW or
<em>placeholder strings</em> under OS X.
@see wxTextEntry::SetHint()
@since 2.9.1
*/
virtual void SetHint(const wxString& hint);
/**
Sets the insertion point in the text field.
@param pos
The new insertion point.
*/
virtual void SetInsertionPoint(long pos);
/**
Sets the insertion point at the end of the combo control text field.
*/
virtual void SetInsertionPointEnd();
//@{
/**
Attempts to set the control margins. When margins are given as wxPoint,
x indicates the left and y the top margin. Use -1 to indicate that
an existing value should be used.
@return
@true if setting of all requested margins was successful.
@since 2.9.1
*/
bool SetMargins(const wxPoint& pt);
bool SetMargins(wxCoord left, wxCoord top = -1);
//@}
/**
Set side of the control to which the popup will align itself. Valid
values are @c wxLEFT, @c wxRIGHT and 0. The default value 0 means that
the most appropriate side is used (which, currently, is always
@c wxLEFT).
*/
void SetPopupAnchor(int anchorSide);
/**
Set popup interface class derived from wxComboPopup. This method should
be called as soon as possible after the control has been created,
unless OnButtonClick() has been overridden.
*/
void SetPopupControl(wxComboPopup* popup);
/**
Extends popup size horizontally, relative to the edges of the combo
control.
@param extLeft
How many pixel to extend beyond the left edge of the control.
Default is 0.
@param extRight
How many pixel to extend beyond the right edge of the control.
Default is 0.
@remarks Popup minimum width may override arguments. It is up to the
popup to fully take this into account.
*/
void SetPopupExtents(int extLeft, int extRight);
/**
Sets preferred maximum height of the popup.
@remarks Value -1 indicates the default.
*/
void SetPopupMaxHeight(int height);
/**
Sets minimum width of the popup. If wider than combo control, it will
extend to the left.
@remarks Value -1 indicates the default. Also, popup implementation may
choose to ignore this.
*/
void SetPopupMinWidth(int width);
/**
Selects the text between the two positions, in the combo control text
field.
@param from
The first position.
@param to
The second position.
*/
virtual void SetSelection(long from, long to);
/**
Sets the text for the text field without affecting the popup. Thus,
unlike SetValue(), it works equally well with combo control using
@c wxCB_READONLY style.
*/
void SetText(const wxString& value);
/**
This will set the space in pixels between left edge of the control and
the text, regardless whether control is read-only or not. Value -1 can
be given to indicate platform default.
@deprecated Use SetMargins() instead.
*/
void SetTextIndent(int indent);
/**
Sets the text for the combo control text field.
@note For a combo control with @c wxCB_READONLY style the string must
be accepted by the popup (for instance, exist in the dropdown
list), otherwise the call to SetValue() is ignored.
*/
virtual void SetValue(const wxString& value);
/**
Same as SetValue(), but also sends wxCommandEvent of type
wxEVT_COMMAND_TEXT_UPDATED if @a withEvent is @true.
*/
void SetValueWithEvent(const wxString& value, bool withEvent = true);
/**
Show the popup.
*/
virtual void ShowPopup();
/**
Undoes the last edit in the text field. Windows only.
*/
virtual void Undo();
/**
Enable or disable usage of an alternative popup window, which
guarantees ability to focus the popup control, and allows common native
controls to function normally. This alternative popup window is usually
a wxDialog, and as such, when it is shown, its parent top-level window
will appear as if the focus has been lost from it.
*/
void UseAltPopupWindow(bool enable = true);
protected:
/**
This member function is not normally called in application code.
Instead, it can be implemented in a derived class to create a custom
popup animation.
The parameters are the same as those for DoShowPopup().
@return @true if animation finishes before the function returns,
@false otherwise. In the latter case you need to manually call
DoShowPopup() after the animation ends.
*/
virtual bool AnimateShow(const wxRect& rect, int flags);
/**
This member function is not normally called in application code.
Instead, it can be implemented in a derived class to return default
wxComboPopup, incase @a popup is @NULL.
@note If you have implemented OnButtonClick() to do something else than
show the popup, then DoSetPopupControl() must always set @a popup
to @NULL.
*/
virtual void DoSetPopupControl(wxComboPopup* popup);
/**
This member function is not normally called in application code.
Instead, it must be called in a derived class to make sure popup is
properly shown after a popup animation has finished (but only if
AnimateShow() did not finish the animation within its function scope).
@param rect
Position to show the popup window at, in screen coordinates.
@param flags
Combination of any of the following:
@beginTable
@row2col{wxComboCtrl::ShowAbove,
Popup is shown above the control instead of below.}
@row2col{wxComboCtrl::CanDeferShow,
Showing the popup can be deferred to happen sometime after
ShowPopup() has finished. In this case, AnimateShow() must
return false.}
@endTable
*/
virtual void DoShowPopup(const wxRect& rect, int flags);
};