[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

Hotkey component for form onkeydown event?

Posted on 2001-08-30
7
Medium Priority
?
428 Views
Last Modified: 2010-04-06
Is it possible for a hotkey component to be used to configure the key combinations pressed in a form's onkeydown event?

I would like to create two forms where the first form has the hotkey event that configures the hotkey combination. When the second window is displayed, a hidden component is visible when the user presses the combination keys on the form that's configured in the first form.

I would appreciate source code implemented in the answers, thanks.
0
Comment
Question by:NitroBlaze
[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
  • 4
  • 3
7 Comments
 
LVL 10

Expert Comment

by:Jacco
ID: 6443665
Hi NitroBlaze,

I am not sure I understand completely what you mean.

Just let me know if this is it.

Is it something like this:

  class TForm1(TForm)
    procedure FormCreate(Sender: TObject);
    HotKeyController: THotKeyController; (* your component *)
  end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  HotKeyController.Key := VK_ENTER;
  HotKeyController.Shift := [ssCtrl, ssAlt];
end;

  class TForm2(TForm)
    Form2KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
  end;


procedure Form2KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
  if Form1.HotKeyController.Test(Key, Shift) then
  begin
    MyHiddenControl.Visible := True;
  end;
end;

Regards Jacco
0
 

Author Comment

by:NitroBlaze
ID: 6447203
is it possible to use the pre-installed Hotkey component located in the Advanced components tab in Delphi? It handles different properties like Modifiers for the Shift and Shortcut for the Key property.
0
 
LVL 10

Expert Comment

by:Jacco
ID: 6447208
Delphi 6 right? I don't have it at home.

Regards Jacco
0
Independent Software Vendors: 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!

 

Author Comment

by:NitroBlaze
ID: 6447219
Yes. In that case, what components do you recommend me to check out on this matter? Thanks.
0
 
LVL 10

Accepted Solution

by:
Jacco earned 300 total points
ID: 6450622
Hi NitroBlaze,

In the office I have Delphi six so I've tried to make you a sample. Here is a sample on how to do it.

Good luck and regards Jacco

*** start of code ***
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    HotKey1: THotKey;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses Unit2;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  with TForm2.Create(Self) do
  try
    ShowModal;
  finally
    Free;
  end;
end;

end.
*** end of code ***
*** start of code ***
unit Unit2;

interface

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

type
  TForm2 = class(TForm)
    Memo1: TMemo;
    procedure FormKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

uses
  Unit1, QMenus;

{$R *.dfm}

procedure TForm2.FormKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
  if ShortCut(Key, Shift) = Form1.HotKey1.HotKey then
    Memo1.Visible := True;
end;

end.
*** end of code ***
0
 

Author Comment

by:NitroBlaze
ID: 6451930
The code does not accept common windows keyboard shortcuts like (Ctrl-A : Select All), that's workable by registering the combination beforehand, other than that, it works perfectly.

Thanks.
0
 
LVL 10

Expert Comment

by:Jacco
ID: 6452287
Try setting KeyPreview of the form to True

If you do that the form will see the key first. If you set Key to 0 in FormKeyDown the active control of the form will not handle the key. (It is tricky sometimes though).

And don't forget the HotKey component has a property for not allowing some key combinations.

Regards Jacco

0

Featured Post

What’s Wrong with Your Cloud Strategy ?

Even as many CIOs are embracing a cloud-first strategy, the reality is that moving to the cloud is a lengthy process and the end-state is likely to be a blend of multiple clouds—public and private. Learn why multicloud solutions matter in this webinar by Nimble Storage.

Question has a verified solution.

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

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
Please read the paragraph below before following the instructions in the video — there are important caveats in the paragraph that I did not mention in the video. If your PaperPort 12 or PaperPort 14 is failing to start, or crashing, or hanging, …
Suggested Courses

656 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