94 lines
2.7 KiB
ObjectPascal
94 lines
2.7 KiB
ObjectPascal
{
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:: X2UtVirtualTree provides a set of functions commonly used with
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:: TVirtualTree (http://www.delphi-gems.com/).
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::
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:: Last changed: $Date$
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:: Revision: $Rev$
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:: Author: $Author$
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}
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unit X2UtVirtualTree;
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interface
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uses
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Graphics,
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VirtualTrees,
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Windows;
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//:$ Applies the sort order on the specified column.
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//:: When a column is already sorted, the sort order is reversed.
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//:: Specify a SortColor to provide the new column with that color
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//:: (similar to Explorer in Windows XP). If you choose to use SortColor,
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//:: the column's Tag property will be used to restore the color when calling
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//:: SortColumn for the second time, so be sure not to rely on that.
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procedure SortColumn(const AHeader: TVTHeader;
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const AColumn: TColumnIndex;
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const ASortColor: TColor = clNone;
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const AApplySort: Boolean = True);
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//:$ Calculates the position of an image in a virtual string tree.
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function CalcImagePos(const ATree: TVirtualStringTree;
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const ANode: PVirtualNode;
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const ACellRect: TRect): TPoint;
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implementation
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procedure SortColumn(const AHeader: TVTHeader;
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const AColumn: TColumnIndex;
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const ASortColor: TColor;
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const AApplySort: Boolean);
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begin
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with AHeader do
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begin
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if (ASortColor <> clNone) and (SortColumn <> -1) then
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with Columns[SortColumn] do
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if Tag <> 0 then
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begin
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Color := TColor(Tag);
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Tag := 0;
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end;
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if AApplySort then
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if SortColumn = AColumn then
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SortDirection := TSortDirection(1 - Integer(SortDirection))
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else begin
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SortColumn := AColumn;
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SortDirection := sdAscending;
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end;
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if ASortColor <> clNone then
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with Columns[SortColumn] do
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begin
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Tag := Color;
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Color := ASortColor;
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end;
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end;
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end;
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function CalcImagePos(const ATree: TVirtualStringTree;
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const ANode: PVirtualNode;
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const ACellRect: TRect): TPoint;
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var
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pNode: PVirtualNode;
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begin
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Result := ACellRect.TopLeft;
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with ATree do
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begin
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pNode := ANode;
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if Assigned(pNode) and not (toShowRoot in ATree.TreeOptions.PaintOptions) then
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pNode := pNode^.Parent;
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while Assigned(pNode) and (pNode <> ATree.RootNode) do
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begin
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Inc(Result.X, Indent);
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pNode := pNode^.Parent;
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end;
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Inc(Result.X, Margin);
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Inc(Result.Y, (Integer(NodeHeight[ANode]) - Images.Height) div 2);
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end;
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end;
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end.
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