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Changing header style in a TListView control
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Question:
How can I change the style of the header in a TListView control?Answer:
Delphi's VCL does not provide this. You need to- get the header handle for the listview
- read the current style attributes for the header
- modify a style
- apply the new style
- invalidate the listview (force a redraw)
See the code snipped below. The result is a 'flat' listview as shown in this screenshot on the left side:
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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, ComCtrls;
type
TForm1 = class(TForm)
ListView1: TListView;
ListView2: TListView;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
uses
CommCtrl;
{$R *.DFM}
procedure TForm1.FormCreate(Sender: TObject);
const
LVM_GETHEADER = LVM_FIRST+31;
var
hHeader: THandle;
Style: DWORD;
begin
{ get the header handle for the listview }
hHeader := SendMessage(ListView1.Handle, LVM_GETHEADER, 0, 0);
{ get the current style attributes for the header }
Style := GetWindowLong(hHeader, GWL_STYLE);
{ toggle the HDS_BUTTONS style }
Style := Style xor HDS_BUTTONS;
{ apply the new style }
SetWindowLong(hHeader, GWL_STYLE, Style);
{ invalidate the listview (force a redraw) }
SetWindowPos(ListView1.Handle, Form1.Handle,
0, 0, 0, 0,
SWP_NOZORDER or SWP_NOSIZE or
SWP_NOMOVE or SWP_DRAWFRAME)
end;
end. | ||
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Comments:
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While setting the 'Style' property, is it possible to RIGHT_ALIGN the images in the cloumns header?
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