Delphi 如何在TVirtualStringTree中绘制特殊级别的背景色
我尝试在VirtualStringTree的所有单独级别中使用背景色绘制高线文本。它看起来像是所有相同级别的选定节点。 下面的代码不起作用。请有人给个方向Delphi 如何在TVirtualStringTree中绘制特殊级别的背景色,delphi,virtualtreeview,tvirtualstringtree,Delphi,Virtualtreeview,Tvirtualstringtree,我尝试在VirtualStringTree的所有单独级别中使用背景色绘制高线文本。它看起来像是所有相同级别的选定节点。 下面的代码不起作用。请有人给个方向 procedure TMainForm.Tree1PaintText(Sender: TBaseVirtualTree; const TargetCanvas: TCanvas; Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType); var Data: PNod
procedure TMainForm.Tree1PaintText(Sender: TBaseVirtualTree; const TargetCanvas: TCanvas; Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType);
var Data: PNodeData;LEVEL:INTEGER; tree1node,tree4Node: PVirtualNode;
begin
Data := Tree1.GetNodeData(Node);
Level := tree1.GetNodeLevel(node);
case column of
0:begin
if Level = 0 then BEGIN
TargetCanvas.Font.Style := TargetCanvas.Font.Style + [fsBold];
TargetCanvas.Font.Color :=CLyellow;
targetcanvas.Brush.Color :=clgreen;//don't work
targetcanvas.Brush.Style :=bssolid;
END;
if Level = 1 then BEGIN
TargetCanvas.Font.Color :=CLaqua;
targetcanvas.Brush.Color :=clgreen;
end;
end;
VT更快地填充单元格背景,在PrepareCell方法中更具体。所以现在尝试设置画布笔刷已经太迟了。尝试从OnBeforeCellPaint事件中填充节点矩形:
procedure TForm1.VirtualStringTree1BeforeCellPaint(Sender: TBaseVirtualTree;
TargetCanvas: TCanvas; Node: PVirtualNode; Column: TColumnIndex;
CellPaintMode: TVTCellPaintMode; CellRect: TRect; var ContentRect: TRect);
var
R: TRect;
begin
if CellPaintMode = cpmPaint then
begin
R := Sender.GetDisplayRect(Node, Column, True, False, True);
R.Offset(0, -R.Top);
case Sender.GetNodeLevel(Node) of
0: TargetCanvas.Brush.Color := $0000F9FF;
1: TargetCanvas.Brush.Color := $0000BFFF;
2: TargetCanvas.Brush.Color := $000086FF;
end;
TargetCanvas.FillRect(R);
end;
end;
预览:
一种方法是在
OnBeforeItemErase
事件中使用eaColor
作为擦除操作:
procedure TMainForm.Tree1BeforeItemErase(Sender: TBaseVirtualTree; TargetCanvas: TCanvas;
Node: PVirtualNode; ItemRect: TRect; var ItemColor: TColor; var EraseAction: TItemEraseAction);
begin
if not Sender.Selected[Node] then begin
case Sender.GetNodeLevel(Node) of
0: ItemColor := clgreen;
1: ItemColor := clAgua;
end;
EraseAction := eaColor;
end;
end;
您好,我测试了代码。它可以在不同的列中显示背景颜色。“itemcolor”似乎仅适用于fillrect所有项目。如果fillrect仅用于项目文本(不包括空格),如何改进?。谢谢,项目擦除用于整行(即所有列),如果您需要更多控制,您可能必须使用自定义绘制。祝贺达到5k代表!:)