fixing overrelease and out-of-bounds write, fixes #13725

[wxWidgets.git] / src / common / wincmn.cpp

diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index ecc4aa88320254cabed2bb34b32af847d3c00f49..13370f51c630f8e449b635438ae1240d04c2449a 100644 (file)
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -620,20 +620,13 @@ void wxWindowBase::DoCentre(int dir)
 // fits the window around the children
 void wxWindowBase::Fit()
 {
-    if ( !GetChildren().empty() )
-    {
-        SetSize(GetBestSize());
-    }
-    //else: do nothing if we have no children
+    SetSize(GetBestSize());
 }
 
 // fits virtual size (ie. scrolled area etc.) around children
 void wxWindowBase::FitInside()
 {
-    if ( GetChildren().GetCount() > 0 )
-    {
-        SetVirtualSize( GetBestVirtualSize() );
-    }
+    SetVirtualSize( GetBestVirtualSize() );
 }
 
 // On Mac, scrollbars are explicitly children.
@@ -649,7 +642,7 @@ static bool wxHasRealChildren(const wxWindowBase* win)
         wxWindow *win = node->GetData();
         if ( !win->IsTopLevel() && win->IsShown()
 #if wxUSE_SCROLLBAR
-            && !win->IsKindOf(CLASSINFO(wxScrollBar))
+            && !wxDynamicCast(win, wxScrollBar)
 #endif
             )
             realChildCount ++;
@@ -906,26 +899,53 @@ wxSize wxWindowBase::GetBestSize() const
     // it to be used
     wxSize size = DoGetBestClientSize();
     if ( size != wxDefaultSize )
-    {
         size += DoGetBorderSize();
+    else
+        size = DoGetBestSize();
 
-        CacheBestSize(size);
-        return size;
-    }
+    // Ensure that the best size is at least as large as min size.
+    size.IncTo(GetMinSize());
 
-    return DoGetBestSize();
+    // And not larger than max size.
+    size.DecToIfSpecified(GetMaxSize());
+
+    // Finally cache result and return.
+    CacheBestSize(size);
+    return size;
+}
+
+int wxWindowBase::GetBestHeight(int width) const
+{
+    const int height = DoGetBestClientHeight(width);
+
+    return height == wxDefaultCoord
+            ? GetBestSize().y
+            : height + DoGetBorderSize().y;
+}
+
+int wxWindowBase::GetBestWidth(int height) const
+{
+    const int width = DoGetBestClientWidth(height);
+
+    return width == wxDefaultCoord
+            ? GetBestSize().x
+            : width + DoGetBorderSize().x;
 }
 
 void wxWindowBase::SetMinSize(const wxSize& minSize)
 {
     m_minWidth = minSize.x;
     m_minHeight = minSize.y;
+
+    InvalidateBestSize();
 }
 
 void wxWindowBase::SetMaxSize(const wxSize& maxSize)
 {
     m_maxWidth = maxSize.x;
     m_maxHeight = maxSize.y;
+
+    InvalidateBestSize();
 }
 
 void wxWindowBase::SetInitialSize(const wxSize& size)
@@ -1242,9 +1262,27 @@ void wxWindowBase::Thaw()
 }
 
 // ----------------------------------------------------------------------------
-// reparenting the window
+// Dealing with parents and children.
 // ----------------------------------------------------------------------------
 
+bool wxWindowBase::IsDescendant(wxWindowBase* win) const
+{
+    // Iterate until we find this window in the parent chain or exhaust it.
+    while ( win )
+    {
+        if ( win == this )
+            return true;
+
+        // Stop iterating on reaching the top level window boundary.
+        if ( win->IsTopLevel() )
+            break;
+
+        win = win->GetParent();
+    }
+
+    return false;
+}
+
 void wxWindowBase::AddChild(wxWindowBase *child)
 {
     wxCHECK_RET( child, wxT("can't add a NULL child") );
@@ -1402,7 +1440,11 @@ wxEvtHandler *wxWindowBase::PopEventHandler(bool deleteHandler)
         "the first handler of the wxWindow stack should have non-NULL next handler" );
 
     firstHandler->SetNextHandler(NULL);
-    secondHandler->SetPreviousHandler(NULL);
+
+    // It is harmless but useless to unset the previous handler of the window
+    // itself as it's always NULL anyhow, so don't do this.
+    if ( secondHandler != this )
+        secondHandler->SetPreviousHandler(NULL);
 
     // now firstHandler is completely unlinked; set secondHandler as the new window event handler
     SetEventHandler(secondHandler);
@@ -1916,6 +1958,7 @@ wxWindowBase::FindWindowById( long id, const wxWindow* parent )
 // dialog oriented functions
 // ----------------------------------------------------------------------------
 
+#if WXWIN_COMPATIBILITY_2_8
 void wxWindowBase::MakeModal(bool modal)
 {
     // Disable all other windows
@@ -1932,6 +1975,7 @@ void wxWindowBase::MakeModal(bool modal)
         }
     }
 }
+#endif // WXWIN_COMPATIBILITY_2_8
 
 bool wxWindowBase::Validate()
 {
@@ -2705,6 +2749,8 @@ wxSize wxWindowBase::GetDlgUnitBase() const
 {
     const wxWindowBase * const parent = wxGetTopLevelParent((wxWindow*)this);
 
+    wxCHECK_MSG( parent, wxDefaultSize, wxS("Must have TLW parent") );
+
     if ( !parent->m_font.IsOk() )
     {
         // Default GUI font is used. This is the most common case, so
@@ -3468,7 +3514,7 @@ wxAccStatus wxWindowAccessible::GetLocation(wxRect& rect, int elementId)
     if (win)
     {
         rect = win->GetRect();
-        if (win->GetParent() && !win->IsKindOf(CLASSINFO(wxTopLevelWindow)))
+        if (win->GetParent() && !wxDynamicCast(win, wxTopLevelWindow))
             rect.SetPosition(win->GetParent()->ClientToScreen(rect.GetPosition()));
         return wxACC_OK;
     }
@@ -3587,7 +3633,7 @@ wxAccStatus wxWindowAccessible::GetName(int childId, wxString* name)
     // accessible classes, one for each kind of wxWidgets
     // control or window.
 #if wxUSE_BUTTON
-    if (GetWindow()->IsKindOf(CLASSINFO(wxButton)))
+    if (wxDynamicCast(GetWindow(), wxButton))
         title = ((wxButton*) GetWindow())->GetLabel();
     else
 #endif
@@ -3746,14 +3792,14 @@ wxAccStatus wxWindowAccessible::GetRole(int childId, wxAccRole* role)
     if (childId > 0)
         return wxACC_NOT_IMPLEMENTED;
 
-    if (GetWindow()->IsKindOf(CLASSINFO(wxControl)))
+    if (wxDynamicCast(GetWindow(), wxControl))
         return wxACC_NOT_IMPLEMENTED;
 #if wxUSE_STATUSBAR
-    if (GetWindow()->IsKindOf(CLASSINFO(wxStatusBar)))
+    if (wxDynamicCast(GetWindow(), wxStatusBar))
         return wxACC_NOT_IMPLEMENTED;
 #endif
 #if wxUSE_TOOLBAR
-    if (GetWindow()->IsKindOf(CLASSINFO(wxToolBar)))
+    if (wxDynamicCast(GetWindow(), wxToolBar))
         return wxACC_NOT_IMPLEMENTED;
 #endif
 
@@ -3778,15 +3824,15 @@ wxAccStatus wxWindowAccessible::GetState(int childId, long* state)
     if (childId > 0)
         return wxACC_NOT_IMPLEMENTED;
 
-    if (GetWindow()->IsKindOf(CLASSINFO(wxControl)))
+    if (wxDynamicCast(GetWindow(), wxControl))
         return wxACC_NOT_IMPLEMENTED;
 
 #if wxUSE_STATUSBAR
-    if (GetWindow()->IsKindOf(CLASSINFO(wxStatusBar)))
+    if (wxDynamicCast(GetWindow(), wxStatusBar))
         return wxACC_NOT_IMPLEMENTED;
 #endif
 #if wxUSE_TOOLBAR
-    if (GetWindow()->IsKindOf(CLASSINFO(wxToolBar)))
+    if (wxDynamicCast(GetWindow(), wxToolBar))
         return wxACC_NOT_IMPLEMENTED;
 #endif