Try harder to set the requester splitter position in wxSplitterWindow.

The code in wxSplitterWindow tried to remember the requested position and set
the real sash position to it later, even if the initial window size was too
small to allow for it, but it didn't work because the requested position was
forgotten after the first size event, even though it was quite possible that
this event didn't really change the window size from the initial, small, one.

Try to make this more robust by ignoring the size events which don't really
change the window size. Also set m_lastSize correctly initially.

Now setting the sash position does work even if the splitter itself is inside
nested sizers (which results in many size events).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68876 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/generic/splitter.cpp b/src/generic/splitter.cpp
index 03abc8baa54c05914bb3ebcf3bd9bee0933a591a..ab5285ba34f5d1c54b82afb30819e5ac77fd25ad 100644 (file)
--- a/src/generic/splitter.cpp
+++ b/src/generic/splitter.cpp
@@ -93,10 +93,7 @@ bool wxSplitterWindow::Create(wxWindow *parent, wxWindowID id,
     if ( !wxWindow::Create(parent, id, pos, size, style, name) )
         return false;
 
-    if (size.x >= 0)
-        m_lastSize.x = size.x;
-    if (size.y >= 0)
-        m_lastSize.y = size.y;
+    m_lastSize = GetClientSize();
 
     m_permitUnsplitAlways = (style & wxSP_PERMIT_UNSPLIT) != 0;
 
@@ -442,16 +439,22 @@ void wxSplitterWindow::OnSize(wxSizeEvent& event)
         int size = m_splitMode == wxSPLIT_VERTICAL ? w : h;
 
         int old_size = m_splitMode == wxSPLIT_VERTICAL ? m_lastSize.x : m_lastSize.y;
-        if ( old_size != 0 )
+
+        // Don't do anything if the size didn't really change. In particular,
+        // it is important that we don't reset our sash position because it's
+        // out of current range in this case as otherwise the really requested
+        // position would be lost and never set. Wait until we get a real size
+        // event with our non-initial size to do it.
+        if ( size == old_size )
+            return;
+
+        int delta = (int) ( (size - old_size)*m_sashGravity );
+        if ( delta != 0 )
         {
-            int delta = (int) ( (size - old_size)*m_sashGravity );
-            if ( delta != 0 )
-            {
-                int newPosition = m_sashPosition + delta;
-                if( newPosition < m_minimumPaneSize )
-                    newPosition = m_minimumPaneSize;
-                SetSashPositionAndNotify(newPosition);
-            }
+            int newPosition = m_sashPosition + delta;
+            if( newPosition < m_minimumPaneSize )
+                newPosition = m_minimumPaneSize;
+            SetSashPositionAndNotify(newPosition);
         }
 
         if ( m_sashPosition >= size - 5 )