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TScrollBox: fix flicker when Form.AutoSizeAll is called. Do not call ShowScrollBar when nothing changed.

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This commit is contained in:
Martin 2023-10-11 19:53:19 +02:00
parent 07025f3b9c
commit 4891f1f0e1
2 changed files with 8 additions and 3 deletions
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1
lcl/forms.pp
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@ -107,6 +107,7 @@ type
FTracking: Boolean; FTracking: Boolean;
FVisible: Boolean; FVisible: Boolean;
FOldScrollInfo: TScrollInfo; FOldScrollInfo: TScrollInfo;
FOldVisible: Boolean;
FOldScrollInfoValid: Boolean; FOldScrollInfoValid: Boolean;
protected protected
FControl: TWinControl; FControl: TWinControl;

10
lcl/include/controlscrollbar.inc
View File

@ -230,14 +230,18 @@ begin
if (not FOldScrollInfoValid) or (not CompareMem(@ScrollInfo, @FOldScrollInfo, SizeOf(TScrollInfo))) then if (not FOldScrollInfoValid) or (not CompareMem(@ScrollInfo, @FOldScrollInfo, SizeOf(TScrollInfo))) then
begin begin
FOldScrollInfo := ScrollInfo; FOldScrollInfo := ScrollInfo;
FOldScrollInfoValid := True;
SetScrollInfo(ControlHandle, IntfBarKind[Kind], ScrollInfo, NewVisible); SetScrollInfo(ControlHandle, IntfBarKind[Kind], ScrollInfo, NewVisible);
// update policy too // update policy too
ScrollInfo.fMask := SIF_UPDATEPOLICY; ScrollInfo.fMask := SIF_UPDATEPOLICY;
ScrollInfo.nTrackPos := TrackToPolicyMap[FTracking]; ScrollInfo.nTrackPos := TrackToPolicyMap[FTracking];
SetScrollInfo(ControlHandle, IntfBarKind[Kind], ScrollInfo, NewVisible); SetScrollInfo(ControlHandle, IntfBarKind[Kind], ScrollInfo, NewVisible);
end; ShowScrollBar(ControlHandle, IntfBarKind[Kind], NewVisible);
ShowScrollBar(ControlHandle, IntfBarKind[Kind], NewVisible); end
else
if (not FOldScrollInfoValid) or (FOldVisible <> NewVisible) then
ShowScrollBar(ControlHandle, IntfBarKind[Kind], NewVisible);
FOldVisible := NewVisible;
FOldScrollInfoValid := True;
{$IFDEF VerboseScrollingWinControl} {$IFDEF VerboseScrollingWinControl}
//if DebugCondition then //if DebugCondition then
DebugLn(['TControlScrollBar.UpdateScrollBar ',DbgSName(FControl),' ',DbgSName(Self),' ',dbgs(Kind),' FVisible=',FVisible,' Range=',FRange,' FPosition=',FPosition,' FPage=',FPage,' FAutoRange=',FAutoRange,' ShouldVisible=',NewVisible,' IsVisible=',IsScrollBarVisible]); DebugLn(['TControlScrollBar.UpdateScrollBar ',DbgSName(FControl),' ',DbgSName(Self),' ',dbgs(Kind),' FVisible=',FVisible,' Range=',FRange,' FPosition=',FPosition,' FPage=',FPage,' FAutoRange=',FAutoRange,' ShouldVisible=',NewVisible,' IsVisible=',IsScrollBarVisible]);