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How to make the panels of a listview flat?

Posted on 2010-09-12
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Last Modified: 2012-05-10
Hi,

I have found code on the internet for making the panels of a listview flat.
But I don't know how to implement it? (what event etc.. etc...)
Can someone show me how? I have put the code in the code-section.

Greetings,

Peter Kiers


const
  LVM_GETHEADER = LVM_FIRST + 31;
var
  hHeader: THandle;
  style: dWord;
begin
  {to get the header handle for the listview}
  hHeader := SendMessage(ListView1.Handle, LVM_GETHEADER, 0, 0);

  {to get the current style attributes for the header}
  style := GetWindowLong(hHeader, GWL_STYLE);

  {to toggle the HDS_BUTTONS style}
  style := style xor HDS_BUTTONS;

  {to apply the new style}
  SetWindowLong(hHeader, GWL_STYLE, style);

  {to invalidate the listview}
  SetWindowPos(ListView1.Handle, Form1.Handle, 0, 0, 0, 0,
               SWP_NOZORDER or SWP_NOSIZE or SWP_NOMOVE or SWP_DRAWFRAME)
end;

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Question by:peterkiers
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Expert Comment

by:Mechanic_Kharkov
ID: 33658390
That is ready to use code. Just start it on your form's FormCreate method. If it would not work there, then move it to FormShow method, but implement a simple "execute once" mechanism like that:

TForm1 = class()
 ....  
private
  FShownOnce: boolean;
end;

procedure Tform1.FormShow;
begin
  if not FShownOnce then
  begin
     //call mentioned above code
  end;
  FShownOnce := true;
end;

It will prevent code from executing each time form is shown.
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Author Comment

by:peterkiers
ID: 33658407
I what event should i put the code that i have posted.

Peter
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Accepted Solution

by:
Mechanic_Kharkov earned 500 total points
ID: 33658486
In FormCreate.
DoubleClick on form, and Delphi will automatically create template for FormCreate method.
Just put this code there.

You'll get this code

procedure TForm1.FormCreate(Sender: TObject);
const
  LVM_GETHEADER = LVM_FIRST + 31;
var
  hHeader: THandle;
  style: dWord;
begin
  {to get the header handle for the listview}
  hHeader := SendMessage(ListView1.Handle, LVM_GETHEADER, 0, 0);

  {to get the current style attributes for the header}
  style := GetWindowLong(hHeader, GWL_STYLE);

  {to toggle the HDS_BUTTONS style}
  style := style xor HDS_BUTTONS;

  {to apply the new style}
  SetWindowLong(hHeader, GWL_STYLE, style);

  {to invalidate the listview}
  SetWindowPos(ListView1.Handle, Form1.Handle, 0, 0, 0, 0,
               SWP_NOZORDER or SWP_NOSIZE or SWP_NOMOVE or SWP_DRAWFRAME)
end;

And don't forget to add to your Uses clause CommCtrl (there already is CommCtrls but it is a little different).
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Author Comment

by:peterkiers
ID: 33658506
Perfect, it works great.

Greetings,

Peter Kiers
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Expert Comment

by:Mechanic_Kharkov
ID: 33658531
Thank You too for a nice piece of code, Peter. ;-)
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