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TAChart: Optimization of chart sources between BeginUpdate/EndUpdate. Issue #35333, patch by Marcin Wiazowski.

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git-svn-id: trunk@60868 -
This commit is contained in:
wp 2019-04-07 17:59:28 +00:00
parent 11e60c45bc
commit db88431d08
2 changed files with 20 additions and 0 deletions
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12
components/tachart/tacustomsource.pas
View File

@ -219,6 +219,7 @@ type
public
procedure AfterDraw; virtual;
procedure BeforeDraw; virtual;
procedure BeginUpdate; override;
procedure EndUpdate; override;
public
class procedure CheckFormat(const AFormat: String);
@ -930,6 +931,17 @@ begin
Notify;
end;
procedure TCustomChartSource.BeginUpdate;
begin
// Caches will be eventually invalidated in a corresponding EndUpdate() call.
// Since, at this moment, we are already sure, that caches will be invalidated,
// it's better to invalidate them immediately - this will prevent useless efforts
// to keep caches coherent between BeginUpdate() and EndUpdate() calls.
if FUpdateCount = 0 then
InvalidateCaches;
Inc(FUpdateCount);
end;
procedure TCustomChartSource.EndUpdate;
begin
Dec(FUpdateCount);

8
components/tachart/tasources.pas
View File

@ -612,6 +612,13 @@ end;
procedure TListChartSource.Delete(AIndex: Integer);
begin
// Optimization
if IsUpdating then begin
Dispose(Item[AIndex]);
FData.Delete(AIndex);
exit;
end;
with Item[AIndex]^ do begin
FBasicExtentIsValid := FBasicExtentIsValid and
(((FBasicExtent.a.X < X) and (X < FBasicExtent.b.X)) or (XCount = 0)) and
@ -873,6 +880,7 @@ end;
procedure TListChartSource.UpdateCachesAfterAdd(AX, AY: Double);
begin
if IsUpdating then exit; // Optimization
if FBasicExtentIsValid then begin
if FXCount > 0 then UpdateMinMax(AX, FBasicExtent.a.X, FBasicExtent.b.X);
if FYCount > 0 then UpdateMinMax(AY, FBasicExtent.a.Y, FBasicExtent.b.Y);