+void wxScrollHelper::HandleOnChildFocus(wxChildFocusEvent& event)
+{
+ // this event should be processed by all windows in parenthood chain,
+ // e.g. so that nested wxScrolledWindows work correctly
+ event.Skip();
+
+ // find the immediate child under which the window receiving focus is:
+ wxWindow *win = event.GetWindow();
+
+ if ( win == m_targetWindow )
+ return; // nothing to do
+
+ while ( win->GetParent() != m_targetWindow )
+ {
+ win = win->GetParent();
+ if ( !win )
+ return; // event is not from a child of the target window
+ }
+
+ // 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());
+
+ int startx, starty;
+ GetViewStart(&startx, &starty);
+
+ // first in vertical direction:
+ if ( stepy > 0 )
+ {
+ int diff = 0;
+
+ if ( winrect.GetTop() < 0 )
+ {
+ diff = winrect.GetTop();
+ }
+ else if ( winrect.GetBottom() > view.y )
+ {
+ diff = winrect.GetBottom() - view.y + 1;
+ // round up to next scroll step if we can't get exact position,
+ // so that the window is fully visible:
+ diff += stepy - 1;
+ }
+
+ starty = (starty * stepy + diff) / stepy;
+ }
+
+ // then horizontal:
+ if ( stepx > 0 )
+ {
+ int diff = 0;
+
+ if ( winrect.GetLeft() < 0 )
+ {
+ diff = winrect.GetLeft();
+ }
+ else if ( winrect.GetRight() > view.x )
+ {
+ diff = winrect.GetRight() - view.x + 1;
+ // round up to next scroll step if we can't get exact position,
+ // so that the window is fully visible:
+ diff += stepx - 1;
+ }
+
+ startx = (startx * stepx + diff) / stepx;
+ }
+
+ Scroll(startx, starty);
+}
+
projects / wxWidgets.git / blobdiff