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TAChart: Fix access to cached ChartListSource extents while the source is being updated. Issue #35463, patch by Marcin Wiazowski.

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git-svn-id: trunk@61080 -
This commit is contained in:
wp 2019-04-29 16:34:46 +00:00
parent 0979ae36e8
commit 6c66672e31
2 changed files with 19 additions and 10 deletions
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15
components/tachart/tacustomsource.pas
View File

@ -849,7 +849,8 @@ begin
end;
end;
FBasicExtentIsValid := true;
FBasicExtentIsValid := not IsUpdating; // When updating, we are not allowed
// to set "Valid" for caches - see comment in TListChartSource.ClearCaches()
Result := FBasicExtent;
end;
@ -888,7 +889,8 @@ begin
UpdateMinMax(XList[j], FXListExtent.a.X, FXListExtent.b.X);
end;
FXListExtentIsValid := true;
FXListExtentIsValid := not IsUpdating; // When updating, we are not allowed
// to set "Valid" for caches - see comment in TListChartSource.ClearCaches()
end;
Result.a.X := Min(Result.a.X, FXListExtent.a.X);
@ -915,7 +917,8 @@ begin
UpdateMinMax(YList[j], FYListExtent.a.Y, FYListExtent.b.Y);
end;
FYListExtentIsValid := true;
FYListExtentIsValid := not IsUpdating; // When updating, we are not allowed
// to set "Valid" for caches - see comment in TListChartSource.ClearCaches()
end;
Result.a.Y := Min(Result.a.Y, FYListExtent.a.Y);
@ -1018,7 +1021,8 @@ begin
end;
end;
FCumulativeExtentIsValid := true;
FCumulativeExtentIsValid := not IsUpdating; // When updating, we are not allowed
// to set "Valid" for caches - see comment in TListChartSource.ClearCaches()
end;
Result.a.Y := Min(Result.a.Y, FCumulativeExtent.a.Y);
@ -1499,7 +1503,8 @@ begin
for i := 0 to Count - 1 do
with Item[i]^ do
FValuesTotal += NumberOr(Y);
FValuesTotalIsValid := true;
FValuesTotalIsValid := not IsUpdating; // When updating, we are not allowed
// to set "Valid" for caches - see comment in TListChartSource.ClearCaches()
Result := FValuesTotal;
end;

14
components/tachart/tasources.pas
View File

@ -720,16 +720,20 @@ end;
procedure TListChartSource.ClearCaches;
begin
// When updating, we are not allowed to set "Valid" for caches - cached
// data is not synchronized with real data when updating, so setting "Valid"
// could lead to reading outdated cache contents, when calling methods like
// BasicExtent() when still in update mode
FBasicExtent := EmptyExtent;
FBasicExtentIsValid := true;
FBasicExtentIsValid := not IsUpdating;
FCumulativeExtent := EmptyExtent;
FCumulativeExtentIsValid := true;
FCumulativeExtentIsValid := not IsUpdating;
FXListExtent := EmptyExtent;
FXListExtentIsValid := true;
FXListExtentIsValid := not IsUpdating;
FYListExtent := EmptyExtent;
FYListExtentIsValid := true;
FYListExtentIsValid := not IsUpdating;
FValuesTotal := 0;
FValuesTotalIsValid := true;
FValuesTotalIsValid := not IsUpdating;
end;
procedure TListChartSource.CopyFrom(ASource: TCustomChartSource);