Fix setting "pressed" bitmap for wxToggleButton.

Move wxAnyButton::GetNormalState(), which allows wxToggleButton to override
what "normal" means for it, down to the platform-independent wxAnyButtonBase
class and use it now in wxGTK as well to correctly choose the pressed bitmap
for a toggle button in this state.

Closes #16771.

docs/changes.txt

@@ -121,6 +121,7 @@ wxGTK:
 - Support building wxGTK3 under Windows (Kolya Kosenko).
 - Fix vertical cell alignment in wxDataViewCtrl.
 - Fix clearing of wxComboBox with wxCB_READONLY (Chuddah).
+- Fix setting "pressed" bitmap for wxToggleButton (Kevin B. McCarty).
 - Fix GTK+ warnings for wxFileDialog with wxFD_MULTIPLE style.
 
 wxMSW:

include/wx/anybutton.h

@@ -135,6 +135,13 @@ public:
         State_Max
     };
 
+    // return the current setting for the "normal" state of the button, it can
+    // be different from State_Normal for a wxToggleButton
+    virtual State GetNormalState() const
+    {
+        return State_Normal;
+    }
+
     // return true if this button shouldn't show the text label, either because
     // it doesn't have it or because it was explicitly disabled with wxBU_NOTEXT
     bool DontShowLabel() const

include/wx/msw/anybutton.h

@@ -36,7 +36,6 @@ public:
     virtual WXLRESULT MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam);
 
     virtual bool MSWOnDraw(WXDRAWITEMSTRUCT *item);
-    virtual State GetNormalState() const { return State_Normal; }
 
     // returns true if the platform should explicitly apply a theme border
     virtual bool CanApplyThemeBorder() const { return false; }

include/wx/msw/tglbtn.h

@@ -46,8 +46,6 @@ public:
     virtual bool MSWCommand(WXUINT param, WXWORD id);
     virtual void Command(wxCommandEvent& event);
 
-    virtual State GetNormalState() const;
-
     // returns true if the platform should explicitly apply a theme border
     virtual bool CanApplyThemeBorder() const { return false; }
 

include/wx/tglbtn.h

@@ -36,6 +36,12 @@ public:
     virtual void SetValue(bool state) = 0;
     virtual bool GetValue() const = 0;
 
+    // The current "normal" state for the toggle button depends upon its value.
+    virtual State GetNormalState() const wxOVERRIDE
+    {
+        return GetValue() ? State_Pressed : State_Normal;
+    }
+
     void UpdateWindowUI(long flags) wxOVERRIDE
     {
         wxControl::UpdateWindowUI(flags);

src/gtk/anybutton.cpp

@@ -139,8 +139,12 @@ void wxAnyButton::GTKOnFocus(wxFocusEvent& event)
 wxAnyButton::State wxAnyButton::GTKGetCurrentBitmapState() const
 {
     if ( !IsThisEnabled() )
-        return m_bitmaps[State_Disabled].IsOk() ? State_Disabled : State_Normal;
-
+    {
+        if ( m_bitmaps[State_Disabled].IsOk() )
+            return State_Disabled;
+    }
+    else
+    {
         if ( m_isPressed && m_bitmaps[State_Pressed].IsOk() )
             return State_Pressed;
 
@@ -149,7 +153,18 @@ wxAnyButton::State wxAnyButton::GTKGetCurrentBitmapState() const
 
         if ( HasFocus() && m_bitmaps[State_Focused].IsOk() )
             return State_Focused;
+    }
 
+    // Fall back on the normal state: which still might be different from
+    // State_Normal for the toggle buttons, so the check for bitmap validity is
+    // still needed.
+    const State normalState = GetNormalState();
+    if ( m_bitmaps[normalState].IsOk() )
+        return normalState;
+
+    // And if nothing else can (or should) be used, finally fall back to the
+    // normal state which is the only one guaranteed to have a bitmap (if we're
+    // using bitmaps at all and we're only called in this case).
     return State_Normal;
 }
 

src/msw/tglbtn.cpp

@@ -190,12 +190,4 @@ bool wxToggleButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
     return true;
 }
 
-wxAnyButton::State wxToggleButton::GetNormalState() const
-{
-    if ( GetValue() )
-        return State_Pressed;
-    else
-        return State_Normal;
-}
-
 #endif // wxUSE_TOGGLEBTN