根据条件改变TreeView的颜色

在Delphi中使用树形控件TreeView,改变其颜色,使用的是CustomDrawItem方法:

 

procedure TForm1.tv1CustomDrawItem(Sender: TCustomTreeView;
  Node: TTreeNode; State: TCustomDrawState; var DefaultDraw: Boolean);
begin
  if Odd(Node.AbsoluteIndex) then
  begin
    Sender.Canvas.Brush.Color:=clGreen; //改变背景颜色
    Sender.Canvas.Font.Color:=clWhite;  //改变字体颜色
  end
  else
    Sender.Canvas.Font.Color:=clRed;
end;

 在根据内容条件改变时,使用Node判断:

procedure TForm1.tv1CustomDrawItem(Sender: TCustomTreeView;
  Node: TTreeNode; State: TCustomDrawState; var DefaultDraw: Boolean);
begin
  if Length(Node.Text)<5 then
    tv1.Canvas.Brush.Color:=clRed
  else
    tv1.Canvas.Brush.Color:=clWhite;
end;