+// ----------------------------------------------------------------------------
+// Update locking.
+// ----------------------------------------------------------------------------
+
+// Using WM_SETREDRAW with the native control is a bad idea as it's broken in
+// some Windows versions (see http://support.microsoft.com/kb/130611) and
+// doesn't seem to do anything in other ones (e.g. under Windows 7 the tree
+// control keeps updating its scrollbars while the items are added to it,
+// resulting in horrible flicker when adding even a couple of dozen items).
+// So we resize it to the smallest possible size instead of freezing -- this
+// still flickers, but actually not as badly as it would if we didn't do it.
+
+void wxTreeCtrl::DoFreeze()
+{
+ if ( IsShown() )
+ {
+ RECT rc;
+ ::GetWindowRect(GetHwnd(), &rc);
+ m_thawnSize = wxRectFromRECT(rc).GetSize();
+
+ ::SetWindowPos(GetHwnd(), 0, 0, 0, 1, 1,
+ SWP_NOMOVE | SWP_NOZORDER | SWP_NOREDRAW | SWP_NOACTIVATE);
+ }
+}
+
+void wxTreeCtrl::DoThaw()
+{
+ if ( IsShown() )
+ {
+ if ( m_thawnSize != wxDefaultSize )
+ {
+ ::SetWindowPos(GetHwnd(), 0, 0, 0, m_thawnSize.x, m_thawnSize.y,
+ SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
+ }
+ }
+}
+
+// We also need to override DoSetSize() to ensure that m_thawnSize is reset if
+// the window is resized while being frozen -- in this case, we need to avoid
+// resizing it back to its original, pre-freeze, size when it's thawed.
+void wxTreeCtrl::DoSetSize(int x, int y, int width, int height, int sizeFlags)
+{
+ m_thawnSize = wxDefaultSize;
+
+ wxTreeCtrlBase::DoSetSize(x, y, width, height, sizeFlags);
+}
+
projects / wxWidgets.git / blobdiff