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Applied patch from Ticket #9563. Use just the rectangle of the widget with the focus when deciding if scrolling is needed, instead of the rect of the parent of the widget/child of the target window. This fixes some flickering when a panel of widgets is used inside the scrolled window, and also a total lack of scrolling if the focused widget is out of view but the upper-left corner of the panel is in view.

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54552 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robin Dunn 2008-07-09 01:37:32 +00:00
parent 6cecf398fb
commit 3ec704b422
1 changed files with 51 additions and 8 deletions
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59
src/generic/scrlwing.cpp
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@ -1341,21 +1341,64 @@ void wxScrollHelper::HandleOnChildFocus(wxChildFocusEvent& event)
if ( win == m_targetWindow )
return; // nothing to do
while ( win->GetParent() != m_targetWindow )
// Fixing ticket: http://trac.wxwidgets.org/ticket/9563
// When a child inside a wxControlContainer receives a focus, the
// wxControlContainer generates an artificial wxChildFocusEvent for
// itself, telling its parent that 'it' received the focus. The effect is
// that this->HandleOnChildFocus is called twice, first with the
// artificial wxChildFocusEvent and then with the original event. We need
// to ignore the artificial event here or otherwise HandleOnChildFocus
// would first scroll the target window to make the entire
// wxControlContainer visible and immediately afterwards scroll the target
// window again to make the child widget visible. This leads to ugly
// flickering when using nested wxPanels/wxScrolledWindows.
//
// Ignore this event if 'win' is derived from wxControlContainer AND its
// parent is the m_targetWindow AND 'win' is not actually reciving the
// focus (win != FindFocus). TODO: This affects all wxControlContainer
// objects, but wxControlContainer is not part of the wxWidgets RTTI and
// so wxDynamicCast(win, wxControlContainer) does not compile. Find a way
// to determine if 'win' derives from wxControlContainer. Until then,
// testing if 'win' derives from wxPanel will probably get >90% of all
// cases.
wxWindow *actual_focus=wxWindow::FindFocus();
if (win != actual_focus &&
wxDynamicCast(win, wxPanel) != 0 &&
win->GetParent() == m_targetWindow)
// if win is a wxPanel and receives the focus, it should not be
// scrolled into view
return;
wxSize view(m_targetWindow->GetClientSize());
// For composite controls such as wxComboCtrl we should try to fit the
// entire control inside the visible area of the target window, not just
// the focused child of the control. Otherwise we'd make only the textctrl
// part of a wxComboCtrl visible and the button would still be outside the
// scrolled area. But do so only if the parent fits *entirely* inside the
// scrolled window. In other situations, such as nested wxPanel or
// wxScrolledWindows, the parent might be way to big to fit inside the
// scrolled window. If that is the case, then make only the focused window
// visible
if ( win->GetParent() != m_targetWindow)
{
win = win->GetParent();
if ( !win )
return; // event is not from a child of the target window
wxWindow *parent=win->GetParent();
wxSize parent_size=parent->GetSize();
if (parent_size.GetWidth() <= view.GetWidth() &&
parent_size.GetHeight() <= view.GetHeight())
// make the immediate parent visible instead of the focused control
win=parent;
}
// if the child is not fully visible, try to scroll it into view:
int stepx, stepy;
GetScrollPixelsPerUnit(&stepx, &stepy);
// NB: we don't call CalcScrolledPosition() on win->GetPosition() here,
// because children' positions are already scrolled
wxRect winrect(win->GetPosition(), win->GetSize());
wxSize view(m_targetWindow->GetClientSize());
// 'win' position coordinates are relative to it's parent
// convert them so that they are relative to the m_targetWindow viewing area
wxRect winrect(m_targetWindow->ScreenToClient(win->GetScreenPosition()),
win->GetSize());
int startx, starty;
GetViewStart(&startx, &starty);