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Qt: keep track of scrolled offset when viewport is not visible. issue #29239

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git-svn-id: trunk@51003 -
This commit is contained in:
zeljko 2015-12-23 09:17:38 +00:00
parent 654493d96e
commit 6ff3d6e96d
1 changed files with 30 additions and 1 deletions
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31
lcl/interfaces/qt/qtwidgets.pas
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@ -473,9 +473,14 @@ type
{ TQtViewPort }
TQtViewPort = class(TQtWidget)
private
{when our viewport is invisible then we must keep track of scrolling. issue #29239}
FInvisibleX: integer;
FInvisibleY: integer;
public
function CanPaintBackground: Boolean; override;
function EventFilter(Sender: QObjectH; Event: QEventH): Boolean; cdecl; override;
procedure InitializeWidget; override;
procedure scroll(dx, dy: integer; ARect: PRect = nil); override;
procedure stackUnder(AWidget: QWidgetH); override;
end;
@ -16085,6 +16090,18 @@ begin
' Event=', EventTypeToStr(Event),' inUpdate=',inUpdate);
{$endif}
case QEvent_type(Event) of
QEventShow,
QEventShowToParent:
begin
{Qt does not track scrolled offset of widget when it''s not visible.issue #29239}
if (FInvisibleX <> 0) or (FInvisibleY <> 0) then
begin
QWidget_scroll(Widget, FInvisibleX, FInvisibleY);
FInvisibleX := 0;
FInvisibleY := 0;
end;
Result := inherited EventFilter(Sender, Event);
end;
QEventResize:
begin
// immediate update clientRect !
@ -16167,9 +16184,21 @@ begin
end;
end;
procedure TQtViewPort.InitializeWidget;
begin
FInvisibleX := 0;
FInvisibleY := 0;
inherited InitializeWidget;
end;
procedure TQtViewPort.scroll(dx, dy: integer; ARect: PRect = nil);
begin
inherited scroll(dx, dy, ARect);
if not getVisible then
begin
FInvisibleX += dx;
FInvisibleY += dy;
end else
inherited scroll(dx, dy, ARect);
FScrollX := FScrollX + dx;
FScrollY := FScrollY + dy;
end;