///////////////////////////////////////////////////////////////////////////// // 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); /** 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); /** The derived class must implement this to return pointer to the associated control created in Create(). */ virtual wxWindow* GetControl(); /** The derived class must implement this to return string representation of the value. */ virtual wxString GetStringValue() const; /** 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); /** Parent wxComboCtrl. This is parameter has been prepared 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::SetTextIndent() 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 #include 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(); 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 @beginEventTable{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. @endEventTable @library{wxbase} @category{ctrl} @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. @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, const wxString& value = "", 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(); /** 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); /** 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, const wxString& value = "", 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(); /** 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. */ 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); /** 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 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 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. */ 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. */ virtual void HidePopup(); /** 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 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(); /** 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. */ 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); };