Question

Execute code on end of resizing Panel - OnEndResizing

Asked by: Delphi_developer

Hi

I have a panel that I draw some content on it's canvas. I execute the drawing on OnResize event, so that even if the form is resized, the panel will re-draw the content based on new size, width and height.

The problem is that the code gets executed even while resizing... obviously, this is the OnResize event. But I would only like it to re-draw when I stop resizing it. If I have panel set aligned as alClient and I start resizing the Form, it will start drawing panel's content on each move I make with a mouse, and the redraw might happen 100 of times before the form is resized as I wanted it to be...

Is there an option to have 'OnEndResize' event on Panel, so that it only redraws when I stop resizing the form, and panel?

Thank you

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Asked On
2009-06-18 at 07:16:02ID24502548
Tags

Turbo Delphi 2006

,

panel

,

resizing

Topic

Delphi Programming

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: SteveBayPosted on 2009-06-18 at 07:55:12ID: 24658062

You could delay the re-draw. While this would not completely prevent multiple re-draws it would significantly reduce them.
It would look something like this:

uses DateUtils
..
..
private
   FLastResizeTime : TTime;
..
..
procedure TForm1.Panel1Resize(Sender: TObject);
begin
     if MilliSecondsBetween(now, FLastResize) > 100 then
          begin
          // perform re-draw here
          end;
     FLastResize := Now;
end;

                                              
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by: SteveBayPosted on 2009-06-18 at 07:57:19ID: 24658081

No not quite right. It does not perform the final re-draw.
Thinking...

 

by: SteveBayPosted on 2009-06-18 at 08:01:15ID: 24658124

Found this:
http://wall.riscom.net/books/delphi/del_faqs/1441.html
Quoted;
The following example demonstrates trapping the WM_EXITSIZEMOVE
message to determine when the user has exited a Window sizing or
moving event. Although the message is documented as available only
under Windows NT, it does work equally as well under Windows 95. Note
that you can also trap the WM_ENTERSIZEMOVE to determine when the user
is initiating a window move or size operation.

Example:

type
  TForm1 = class(TForm)
  private
    { Private declarations }
  public
    procedure WMEXITSIZEMOVE(var Message: TMessage);
       message WM_EXITSIZEMOVE;
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
procedure TForm1.WMEXITSIZEMOVE(var Message: TMessage);
begin
  Form1.Caption := 'Finished Moving and sizing';
end;

 

by: EddieShipmanPosted on 2009-06-18 at 10:01:05ID: 24659404

You may also try handling the WM_WINDOWPOSCHANGED message.

 

by: Delphi_developerPosted on 2009-07-01 at 08:56:38ID: 24755644

Thank you, SteveBay, it works.

Eddie, your suggestion gave me a tip for another issue, I might have. Thank you.

20120131-EE-VQP-002

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