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win32: fix regression from r50513 #bd6984dbfd. Issue #26086

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git-svn-id: trunk@50526 -
This commit is contained in:
ondrej 2015-11-29 21:11:25 +00:00
parent 72b8d27401
commit c87a82364e
1 changed files with 9 additions and 5 deletions
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14
lcl/interfaces/win32/win32wscontrols.pp
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@ -587,15 +587,19 @@ begin
SWP_NOSIZE or SWP_NOMOVE or SWP_NOZORDER or SWP_NOACTIVATE or VisibilityToFlag[AWinControl.HandleObjectShouldBeVisible])
end;
function ScrollWindowPtr(hWnd: HWND; dx: longint; dy: longint;
prcScroll: pointer; prcClip: pointer; hrgnUpdate: HRGN; prcUpdate: LPRECT;
flags: UINT): WINBOOL; stdcall; external 'user32' name 'ScrollWindowEx';
class procedure TWin32WSWinControl.ScrollBy(const AWinControl: TWinControl;
DeltaX, DeltaY: integer);
var
ScrollArea, ClipArea: TRect;
ScrollFlags: Integer;
begin
if Windows.IsWindowVisible(AWinControl.Handle) then
ScrollWindowPtr(AWinControl.Handle, DeltaX, DeltaY, nil, nil, 0, nil, 0);
begin
ScrollArea := AWinControl.ClientRect; // the whole area -> client rect
ClipArea := AWinControl.ClientRect; // the scroll area without fixed items (e.g. the header row in grids etc.) - currently not supported by the LCL
ScrollFlags := SW_INVALIDATE or SW_ERASE;
ScrollWindowEx(AWinControl.Handle, DeltaX, DeltaY, @ScrollArea, @ClipArea, 0, nil, ScrollFlags);
end;
end;
{ TWin32WSDragImageList }