Solved

Popup Window Focus

Posted on 2004-05-01
1
812 Views
Last Modified: 2010-04-04
I need to create a small Popup window which will contain a number of controls (not necessarily controls with handles). The Popup Window must be able to overlap the Parent Form border, in a similar manner to a Combobox's drop down portion.

(Note the Popup Window is NOT a ListBox, though, in principle, it could contain a ListBox as one of it's controls).

Now, the part I'm having difficulty with: When you click on a control in the Popup window the Parent Form **must** retain focus. The Popup Window must stay open and on top of the Parent Window until manually closed.

At present I'm using the following code in the CreateParams:

procedure TPopupWindow.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.Style := Params.Style or ES_MULTILINE or WS_POPUP;
end;

And this to return Focus to the main form when a control is pressed:

procedure TPopupWindow.ControlPressed(Sender: TObject);
begin
  FMainForm.SetFocus;

 // ... More code to handle the mouse click or keyboard input ...

end;

When you click on a control in the Popup Window the Parent Form looses focus which causes a "flashing effect" of the Parent Form's border when I programmatically return focus to it.

Other info:

The Popup Window does *not* have a Caption. Does *not* have BorderIcons or in fact a Border. The Popup Window's background must be opaque when both inside and outside the Parent Forms boundaries.
0
Comment
Question by:JQL
1 Comment
 
LVL 12

Accepted Solution

by:
Ivanov_G earned 250 total points
ID: 10967276

   in the constructor you send The form handle.

  constructor TPopupMenu.Create (...your params here...; FormHandle : THandle);
  begin
     ......
  end;

  in the constructor you set FormStyle := FormStyle + [fsStayOnTop];

  procedure TPopupMenu.ShowPopup(....your params here...);
  begin
    Show;
    .....
    // activate the form using it's handle
    SendMessage(FormHandle, WM_ACTIVATE, 0, 0);
  end;
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…

685 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