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TAChart: Extract public TChartLegend.MeasureItem function

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git-svn-id: trunk@31332 -
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ask 2011-06-22 13:18:12 +00:00
parent 1ad62b1229
commit 9595273e55
1 changed files with 21 additions and 13 deletions
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34
components/tachart/talegend.pas
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@ -143,6 +143,8 @@ type
ADrawer: IChartDrawer; AItems: TObjectList; const ABounds: TRect);
function Prepare(
ADrawer: IChartDrawer; AItems: TObjectList; var AClipRect: TRect): TRect;
// Not includes the margins around item.
function MeasureItem(ADrawer: IChartDrawer; AItems: TObjectList): TPoint;
published
property Alignment: TLegendAlignment
read FAlignment write SetAlignment default laTopRight;
@ -381,30 +383,36 @@ begin
end;
end;
function TChartLegend.MeasureItem(
ADrawer: IChartDrawer; AItems: TObjectList): TPoint;
var
i: Integer;
begin
ADrawer.Font := Font;
Result := Point(0, 0);
for i := 0 to AItems.Count - 1 do
with ADrawer.TextExtent((AItems[i] as TLegendItem).FText) do begin
Result.X := Max(X, Result.X);
Result.Y := Max(Y, Result.Y);
end;
Result.X += SYMBOL_TEXT_SPACING + SymbolWidth;
end;
function TChartLegend.Prepare(
ADrawer: IChartDrawer; AItems: TObjectList; var AClipRect: TRect): TRect;
var
x, y, i, textHeight: Integer;
x, y: Integer;
sidebar, legendSize: TPoint;
begin
ADrawer.Font := Font;
with MeasureItem(ADrawer, AItems) do
legendSize := Point(X + 2 * Spacing, Spacing + AItems.Count * (Y + Spacing));
// Measure the legend.
legendSize.X := 0;
textHeight := 0;
for i := 0 to AItems.Count - 1 do
with ADrawer.TextExtent((AItems[i] as TLegendItem).FText) do begin
legendSize.X := Max(X, legendSize.X);
textHeight := Max(Y, textHeight);
end;
legendSize.X += 2 * Spacing + SYMBOL_TEXT_SPACING + SymbolWidth;
sidebar.X := 2 * MarginX;
with AClipRect do
legendSize.X := EnsureRange(legendSize.X, 0, Right - Left - sidebar.X);
sidebar.X += legendSize.X;
legendSize.Y := Spacing + AItems.Count * (textHeight + Spacing);
sidebar.Y := 2 * MarginX;
with AClipRect do
legendSize.Y := EnsureRange(legendSize.Y, 0, Bottom - Top - sidebar.Y);