Improve calculating wxSimpleCheckBox rectangle

The code to calculate rectangle occupied by the check box is moved to the shared function GetBoxRect().
Check box rectangle is stored in the data member and this cached position and size are used in the drawing operations and hit tests.

src/propgrid/editors.cpp

@@ -1424,13 +1424,9 @@ enum
 
 const int wxSCB_SETVALUE_CYCLE = 2;
 
-static void DrawSimpleCheckBox( wxWindow* win, wxDC& dc, const wxRect& rect,
-                                int box_h, int state )
+static void DrawSimpleCheckBox(wxWindow* win, wxDC& dc, const wxRect& rect, int state)
 {
 #if wxPG_USE_RENDERER_NATIVE
-    // Box rectangle
-    wxRect r(rect.x+wxPG_XBEFORETEXT, rect.y+((rect.height-box_h)/2),
-             box_h, box_h);
 
     int cbFlags = 0;
     if ( state & wxSCB_STATE_UNSPECIFIED )
@@ -1454,13 +1450,10 @@ static void DrawSimpleCheckBox( wxWindow* win, wxDC& dc, const wxRect& rect,
 #endif
     }
 
-    wxRendererNative::Get().DrawCheckBox(win, dc, r, cbFlags);
+    wxRendererNative::Get().DrawCheckBox(win, dc, rect, cbFlags);
 #else
     wxUnusedVar(win);
 
-    // Box rectangle
-    wxRect r(rect.x+wxPG_XBEFORETEXT, rect.y+((rect.height-box_h)/2),
-             box_h, box_h);
     wxColour useCol = dc.GetTextForeground();
 
     if ( state & wxSCB_STATE_UNSPECIFIED )
@@ -1468,6 +1461,7 @@ static void DrawSimpleCheckBox( wxWindow* win, wxDC& dc, const wxRect& rect,
         useCol = wxColour(220, 220, 220);
     }
 
+    wxRect r(rect);
     // Draw check mark first because it is likely to overdraw the
     // surrounding rectangle.
     if ( state & wxSCB_STATE_CHECKED )
@@ -1529,15 +1523,29 @@ public:
         SetFont( parent->GetFont() );
 
         m_state = 0;
-        m_boxHeight = 12;
-
+        SetBoxHeight(12);
         SetBackgroundStyle( wxBG_STYLE_PAINT );
     }
 
     virtual ~wxSimpleCheckBox();
 
+
+    void SetBoxHeight(int height)
+    {
+        m_boxHeight = height;
+        // Box rectangle
+        wxRect rect(GetClientSize());
+        rect.y += 1;
+        rect.width += 1;
+        m_boxRect = GetBoxRect(rect, m_boxHeight);
+    }
+
+    static wxRect GetBoxRect(const wxRect& r, int box_h)
+    {
+        return wxRect(r.x + wxPG_XBEFORETEXT, r.y + ((r.height - box_h) / 2), box_h, box_h);
+    }
+
     int m_state;
-    int m_boxHeight;
 
 private:
     void OnPaint( wxPaintEvent& event );
@@ -1546,11 +1554,15 @@ private:
 
     void OnResize( wxSizeEvent& event )
     {
+        SetBoxHeight(m_boxHeight); // Recalculate box rectangle
         Refresh();
         event.Skip();
     }
     void OnLeftClickActivate( wxCommandEvent& evt );
 
+    int m_boxHeight;
+    wxRect m_boxRect;
+
     wxDECLARE_EVENT_TABLE();
 };
 
@@ -1571,17 +1583,13 @@ wxSimpleCheckBox::~wxSimpleCheckBox()
 
 void wxSimpleCheckBox::OnPaint( wxPaintEvent& WXUNUSED(event) )
 {
-    wxRect rect(GetClientSize());
     wxAutoBufferedPaintDC dc(this);
-    dc.Clear();
-
-    rect.y += 1;
-    rect.width += 1;
 
     wxColour bgcol = GetBackgroundColour();
+    dc.SetBackground(wxBrush(bgcol));
+    dc.Clear();
     dc.SetBrush( bgcol );
     dc.SetPen( bgcol );
-    dc.DrawRectangle( rect );
 
     dc.SetTextForeground(GetForegroundColour());
 
@@ -1590,13 +1598,12 @@ void wxSimpleCheckBox::OnPaint( wxPaintEvent& WXUNUSED(event) )
          GetFont().GetWeight() == wxFONTWEIGHT_BOLD )
         state |= wxSCB_STATE_BOLD;
 
-    DrawSimpleCheckBox(this, dc, rect, m_boxHeight, state);
+    DrawSimpleCheckBox(this, dc, m_boxRect, state);
 }
 
 void wxSimpleCheckBox::OnLeftClick( wxMouseEvent& event )
 {
-    if ( (event.m_x > (wxPG_XBEFORETEXT-2)) &&
-         (event.m_x <= (wxPG_XBEFORETEXT-2+m_boxHeight)) )
+    if ( m_boxRect.Contains(event.GetPosition()) )
     {
         SetValue(wxSCB_SETVALUE_CYCLE);
     }
@@ -1631,11 +1638,11 @@ void wxSimpleCheckBox::SetValue( int value )
 
 void wxSimpleCheckBox::OnLeftClickActivate( wxCommandEvent& evt )
 {
-    // Construct mouse pseudo-event for initial mouse click
-    wxMouseEvent mouseEvt(wxEVT_LEFT_DOWN);
-    mouseEvt.m_x = evt.GetInt();
-    mouseEvt.m_y = evt.GetExtraLong();
-    OnLeftClick(mouseEvt);
+    wxPoint pt(evt.GetInt(), evt.GetExtraLong());
+    if ( m_boxRect.Contains(pt) )
+    {
+        SetValue(wxSCB_SETVALUE_CYCLE);
+    }
 }
 
 wxPGWindowList wxPGCheckBoxEditor::CreateControls( wxPropertyGrid* propGrid,
@@ -1694,7 +1701,9 @@ void wxPGCheckBoxEditor::DrawValue( wxDC& dc, const wxRect& rect,
         state |= wxSCB_STATE_UNSPECIFIED;
     }
 
-    DrawSimpleCheckBox(property->GetGrid(), dc, rect, dc.GetCharHeight(), state);
+    // Box rectangle
+    wxRect r = wxSimpleCheckBox::GetBoxRect(rect, dc.GetCharHeight());
+    DrawSimpleCheckBox(property->GetGrid(), dc, r, state);
 }
 
 void wxPGCheckBoxEditor::UpdateControl( wxPGProperty* property,
@@ -1709,7 +1718,7 @@ void wxPGCheckBoxEditor::UpdateControl( wxPGProperty* property,
         cb->m_state = wxSCB_STATE_UNSPECIFIED;
 
     wxPropertyGrid* propGrid = property->GetGrid();
-    cb->m_boxHeight = propGrid->GetFontHeight();
+    cb->SetBoxHeight(propGrid->GetFontHeight());
 
     cb->Refresh();
 }