Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Detecting if form minimized

Posted on 1997-06-24
3
Medium Priority
?
309 Views
Last Modified: 2010-04-03
Can anyone tell me how to detect if a form is minimized?  I cannot find any info on this at all.

Ok.  I already had a procedure OnResize, but when the minimize button is pressed, the program does not even trace to this procedure.

I know the OnResize procedure is working, because if the window is moved, this procedure is called perfectly.

I need to know if there is an API which detects when the minimize button is pressed.

Any help would be appreciated.

Stuart
0
Comment
Question by:Stuart_Johnson
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 1

Accepted Solution

by:
CFantin earned 200 total points
ID: 1337743
You can Check the if the WindowState property is wsMinimized.
This property is updated when you form state is changed.
Therefore you can check if the form is Maximized or normal as well with the wsMaximized and wsNormal.

Hope this helps
0
 
LVL 6

Author Comment

by:Stuart_Johnson
ID: 1337744
Edited text of question
0
 
LVL 1

Expert Comment

by:CFantin
ID: 1337745
Here is a bit of code to detect the Minimize, Maximize and restore of a form.

The windows message WM_SYSCOMMAND is captured as well as creating
a message handler for the application.
The message handler for the form needs to be there because when the user right clicks the application button in 95 the windows message for the form is not created but instead the windows message is sent to the application.

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  WINTYPES, WINPROCS, StdCtrls;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
  private
    procedure WMSIZE(var Msg: TMessage); message WM_SYSCOMMAND;
    procedure MyMessage(var Msg: TMSG; var Handled: Boolean);
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WMSIZE(var Msg: TMessage);
begin
  inherited;

  case Msg.WParam of
    SC_MINIMIZE: ShowMessage('Minimize');
    SC_MAXIMIZE: ShowMessage('Maximize');
    SC_RESTORE: ShowMessage('Restore');
  end;
end;

procedure TForm1.MyMessage(var Msg: TMsg; var Handled: Boolean);
begin
  if (Msg.Message = WM_SYSCOMMAND) then
  begin
    case Msg.wParam of
      SC_MINIMIZE: ShowMessage('Minimize');
      SC_MAXIMIZE: ShowMessage('Maximize');
      SC_RESTORE: ShowMessage('Restore');
    end;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnMessage := MyMessage;
end;

end.

Try this out...

Good luck
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question