Don't create multiple parent-less top level frames in layout sample.

[wxWidgets.git] / include / wx / window.h

diff --git a/include/wx/window.h b/include/wx/window.h
index 774be3539d61f03bfd1a7fccfd999c76b8183a71..a5cc6c4fa579de17e8e6f21375df8a1d346fa90a 100644 (file)
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -379,6 +379,13 @@ public:
             *h = s.y;
     }
 
+        // Determine the best size in the other direction if one of them is
+        // fixed. This is used with windows that can wrap their contents and
+        // returns input-independent best size for the others.
+    int GetBestHeight(int width) const;
+    int GetBestWidth(int height) const;
+
+
     void SetScrollHelper( wxScrollHelper *sh )   { m_scrollHelper = sh; }
     wxScrollHelper *GetScrollHelper()            { return m_scrollHelper; }
 
@@ -548,6 +555,43 @@ public:
     // this is the same as SendSizeEventToParent() but using PostSizeEvent()
     void PostSizeEventToParent() { SendSizeEventToParent(wxSEND_EVENT_POST); }
 
+    // These functions should be used before repositioning the children of
+    // this window to reduce flicker or, in MSW case, even avoid display
+    // corruption in some situations (so they're more than just optimization).
+    //
+    // EndRepositioningChildren() should be called if and only if
+    // BeginRepositioningChildren() returns true. To ensure that this is always
+    // done automatically, use ChildrenRepositioningGuard class below.
+    virtual bool BeginRepositioningChildren() { return false; }
+    virtual void EndRepositioningChildren() { }
+
+    // A simple helper which ensures that EndRepositioningChildren() is called
+    // from its dtor if and only if calling BeginRepositioningChildren() from
+    // the ctor returned true.
+    class ChildrenRepositioningGuard
+    {
+    public:
+        // Notice that window can be NULL here, for convenience. In this case
+        // this class simply doesn't do anything.
+        wxEXPLICIT ChildrenRepositioningGuard(wxWindowBase* win)
+            : m_win(win),
+              m_callEnd(win && win->BeginRepositioningChildren())
+        {
+        }
+
+        ~ChildrenRepositioningGuard()
+        {
+            if ( m_callEnd )
+                m_win->EndRepositioningChildren();
+        }
+
+    private:
+        wxWindowBase* const m_win;
+        const bool m_callEnd;
+
+        wxDECLARE_NO_COPY_CLASS(ChildrenRepositioningGuard);
+    };
+
 
     // window state
     // ------------
@@ -740,8 +784,12 @@ public:
         // is this window a top level one?
     virtual bool IsTopLevel() const;
 
+        // is this window a child or grand child of this one (inside the same
+        // TLW)?
+    bool IsDescendant(wxWindowBase* win) const;
+
         // it doesn't really change parent, use Reparent() instead
-    void SetParent( wxWindowBase *parent ) { m_parent = (wxWindow *)parent; }
+    void SetParent( wxWindowBase *parent );
         // change the real parent of this window, return true if the parent
         // was changed, false otherwise (error or newParent == oldParent)
     virtual bool Reparent( wxWindowBase *newParent );
@@ -1500,11 +1548,6 @@ protected:
     // widgets state are necessary
     virtual void DoEnable(bool WXUNUSED(enable)) { }
 
-    // called when the on-screen widget state changes and provides an
-    // an opportunity for the widget to update its visual state (colours,
-    // fonts, anything else) as necessary
-    virtual void OnEnabled(bool WXUNUSED(enabled)) { }
-
 
     // the window id - a number which uniquely identifies a window among
     // its siblings unless it is wxID_ANY
@@ -1683,6 +1726,14 @@ protected:
     // (GetBorderSize() will be used to add them)
     virtual wxSize DoGetBestClientSize() const { return wxDefaultSize; }
 
+    // These two methods can be overridden to implement intelligent
+    // width-for-height and/or height-for-width best size determination for the
+    // window. By default the fixed best size is used.
+    virtual int DoGetBestClientHeight(int WXUNUSED(width)) const
+        { return wxDefaultCoord; }
+    virtual int DoGetBestClientWidth(int WXUNUSED(height)) const
+        { return wxDefaultCoord; }
+
     // this is the virtual function to be overridden in any derived class which
     // wants to change how SetSize() or Move() works - it is called by all
     // versions of these functions in the base class
@@ -1749,7 +1800,7 @@ protected:
     static void NotifyCaptureLost();
 
 private:
-    // recursively call our own and our children OnEnabled() when the
+    // recursively call our own and our children DoEnable() when the
     // enabled/disabled status changed because a parent window had been
     // enabled/disabled
     void NotifyWindowOnEnableChange(bool enabled);