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Use real number of children for reserving deferred sizing space;

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fix apparent bug in Windows doing deferred positioning


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@33908 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Julian Smart 2005-04-28 15:17:02 +00:00
parent 8e44f3caab
commit c3723477cc
1 changed files with 48 additions and 7 deletions
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45
src/msw/window.cpp
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@ -4164,15 +4164,34 @@ bool wxWindowMSW::HandleSize(int WXUNUSED(w), int WXUNUSED(h), WXUINT wParam)
{
// when we resize this window, its children are probably going to be
// repositioned as well, prepare to use DeferWindowPos() for them
const int numChildren = GetChildren().GetCount();
#if USE_DEFERRED_SIZING
// when we resize this window, its children are probably going to be
// repositioned as well, prepare to use DeferWindowPos() for them
int numChildren = 0;
for ( HWND child = ::GetWindow(GetHwndOf(this), GW_CHILD);
child;
child = ::GetWindow(child, GW_HWNDNEXT) )
{
numChildren ++;
}
// Protect against valid m_hDWP being overwritten
bool useDefer = false;
if ( numChildren > 1 )
{
if (!m_hDWP)
{
m_hDWP = (WXHANDLE)::BeginDeferWindowPos(numChildren);
if ( !m_hDWP )
{
wxLogLastError(_T("BeginDeferWindowPos"));
}
if (m_hDWP)
useDefer = true;
}
}
#endif
// update this window size
bool processed = false;
@ -4205,8 +4224,9 @@ bool wxWindowMSW::HandleSize(int WXUNUSED(w), int WXUNUSED(h), WXUINT wParam)
processed = GetEventHandler()->ProcessEvent(event);
}
#if USE_DEFERRED_SIZING
// and finally change the positions of all child windows at once
if ( m_hDWP )
if ( useDefer && m_hDWP )
{
// reset m_hDWP to NULL so that child windows don't try to use our
// m_hDWP after we call EndDeferWindowPos() on it (this shouldn't
@ -4220,7 +4240,28 @@ bool wxWindowMSW::HandleSize(int WXUNUSED(w), int WXUNUSED(h), WXUINT wParam)
{
wxLogLastError(_T("EndDeferWindowPos"));
}
// Seems to be a bug in DeferWindowPos such that going from (a) to (b) to (a)
// doesn't work (omits last position/size). So check if there's a disparity,
// and correct.
for ( wxWindowList::compatibility_iterator node = GetChildren().GetFirst();
node;
node = node->GetNext() )
{
wxWindow *child = node->GetData();
wxExtraWindowData* extraData = (wxExtraWindowData*) child->m_windowReserved;
if (extraData && extraData->m_deferring)
{
wxPoint pos = child->GetPosition();
if (extraData->m_pos != pos)
child->Move(extraData->m_pos);
extraData->m_deferring = false;
}
}
}
#endif
return processed;
}