Add support for mouse hover state to wxAuiTabArt

This allows wxAuiNotebook to support drawing its tabs differently depending on
whether the mouse is hovering above them or not.

See https://github.com/wxWidgets/wxWidgets/pull/105

include/wx/aui/auibook.h

@@ -99,6 +99,7 @@ public:
     wxBitmap bitmap;      // tab's bitmap
     wxRect rect;          // tab's hit rectangle
     bool active;          // true if the page is currently active
+    bool hover;           // true if mouse hovering over tab
 };
 
 class WXDLLIMPEXP_AUI wxAuiTabContainerButton
@@ -234,6 +235,8 @@ protected:
     wxAuiTabContainerButton* m_hoverButton;
     wxAuiTabContainerButton* m_pressedButton;
 
+    void SetHoverTab(wxWindow* wnd);
+
 #ifndef SWIG
     wxDECLARE_CLASS(wxAuiTabCtrl);
     wxDECLARE_EVENT_TABLE();

src/aui/auibook.cpp

@@ -186,6 +186,7 @@ bool wxAuiTabContainer::AddPage(wxWindow* page,
     wxAuiNotebookPage page_info;
     page_info = info;
     page_info.window = page;
+    page_info.hover = false;
 
     m_pages.Add(page_info);
 
@@ -205,6 +206,7 @@ bool wxAuiTabContainer::InsertPage(wxWindow* page,
     wxAuiNotebookPage page_info;
     page_info = info;
     page_info.window = page;
+    page_info.hover = false;
 
     if (idx >= m_pages.GetCount())
         m_pages.Add(page_info);
@@ -1233,20 +1235,28 @@ void wxAuiTabCtrl::OnMotion(wxMouseEvent& evt)
         }
     }
 
-#if wxUSE_TOOLTIPS
     wxWindow* wnd = NULL;
     if (evt.Moving() && TabHitTest(evt.m_x, evt.m_y, &wnd))
     {
+        SetHoverTab(wnd);
+
+#if wxUSE_TOOLTIPS
         wxString tooltip(m_pages[GetIdxFromWindow(wnd)].tooltip);
 
         // If the text changes, set it else, keep old, to avoid
         // 'moving tooltip' effect
         if (GetToolTipText() != tooltip)
             SetToolTip(tooltip);
+#endif // wxUSE_TOOLTIPS
     }
     else
+    {
+        SetHoverTab(NULL);
+
+#if wxUSE_TOOLTIPS
         UnsetToolTip();
 #endif // wxUSE_TOOLTIPS
+    }
 
     if (!evt.LeftIsDown() || m_clickPt == wxDefaultPosition)
         return;
@@ -1287,6 +1297,8 @@ void wxAuiTabCtrl::OnLeaveWindow(wxMouseEvent& WXUNUSED(event))
         Refresh();
         Update();
     }
+
+    SetHoverTab(NULL);
 }
 
 void wxAuiTabCtrl::OnButton(wxAuiNotebookEvent& event)
@@ -3450,5 +3462,26 @@ int wxAuiNotebook::DoModifySelection(size_t n, bool events)
     return m_curPage;
 }
 
+void wxAuiTabCtrl::SetHoverTab(wxWindow* wnd)
+{
+    bool hoverChanged = false;
+
+    const size_t page_count = m_pages.GetCount();
+    for ( size_t i = 0; i < page_count; ++i )
+    {
+        wxAuiNotebookPage& page = m_pages.Item(i);
+        bool oldHover = page.hover;
+        page.hover = (page.window == wnd);
+        if ( oldHover != page.hover )
+            hoverChanged = true;
+    }
+
+    if ( hoverChanged )
+    {
+        Refresh();
+        Update();
+    }
+}
+
 
 #endif // wxUSE_AUI