implement support for bitmaps for all states in wxGTK wxButton

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61080 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/button.h

@@ -17,7 +17,7 @@
 class WXDLLIMPEXP_CORE wxButton : public wxButtonBase
 {
 public:
-    wxButton() { }
+    wxButton() { Init(); }
     wxButton(wxWindow *parent, wxWindowID id,
            const wxString& label = wxEmptyString,
            const wxPoint& pos = wxDefaultPosition,
@@ -25,6 +25,8 @@ public:
            const wxValidator& validator = wxDefaultValidator,
            const wxString& name = wxButtonNameStr)
     {
+        Init();
+
         Create(parent, id, label, pos, size, style, validator, name);
     }
 
@@ -48,6 +50,13 @@ public:
     // helper to allow access to protected member from GTK callback
     void MoveWindow(int x, int y, int width, int height) { DoMoveWindow(x, y, width, height); }
 
+    // called from GTK callbacks: they update the button state and call
+    // GTKUpdateBitmap()
+    void GTKMouseEnters();
+    void GTKMouseLeaves();
+    void GTKPressed();
+    void GTKReleased();
+
 protected:
     virtual wxSize DoGetBestSize() const;
     virtual void DoApplyWidgetStyle(GtkRcStyle *style);
@@ -59,8 +68,40 @@ protected:
     virtual void DoSetBitmapPosition(wxDirection dir);
 
 private:
+    // common part of all ctors
+    void Init()
+    {
+        m_isCurrent =
+        m_isPressed = false;
+    }
+
+    // focus event handler: calls GTKUpdateBitmap()
+    void GTKOnFocus(wxFocusEvent& event);
+
+    // update the bitmap to correspond to the current button state
+    void GTKUpdateBitmap();
+
+    // return the current button state from m_isXXX flags (which means that it
+    // might not correspond to the real current state as e.g. m_isCurrent will
+    // never be true if we don't have a valid current bitmap)
+    State GTKGetCurrentState() const;
+
+    // show the given bitmap (must be valid)
+    void GTKDoShowBitmap(const wxBitmap& bitmap);
+
+
+    // the bitmaps for the different state of the buttons, all of them may be
+    // invalid and the button only shows a bitmap at all if State_Normal bitmap
+    // is valid
     wxBitmap m_bitmaps[State_Max];
 
+    // true iff mouse is currently over the button
+    bool m_isCurrent;
+
+    // true iff the button is in pressed state
+    bool m_isPressed;
+
+
     DECLARE_DYNAMIC_CLASS(wxButton)
 };