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on Jun 23rd, 2010Tip: How to detect that a View was Detached

Here is a question that I got on a post about detached views:

“How can I detect that a View has been detached from the main window? I would like to adjust the view’s behavior in that case.”

There is no API to obtain that information directly. However it is possible to do this with a few tricks:

  1. detached views have an empty window title (i.e. shell.getText().length() == 0)
  2. when a view is detached resize events are fired

Armed with that knowledge we can detect that a view is detached / reattached. The snippet below shows how (tested on windows).

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detached view Tip: How to detect that a View was Detached

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    7 responses so far syndicate

    7 Responses to “Tip: How to detect that a View was Detached”

    1. BARON Mickael says:
      June 24, 2010 at 00:00

      It’s a bit of hack, thanks a lot.

      Do you know the reasons why the API does not exist ? OS constraints ?

    2. Jens Kreidler says:
      June 24, 2010 at 09:59

      Thx for this tip! Could come in handy!
      By the way, I’d like to know if and how you can detach a view part programatically! Thx in advance

    3. AEHP says:
      June 24, 2010 at 15:03

      You are the best, I don’t words.
      Thank man, Gad exist for you.

    4. BARON Mickael says:
      June 25, 2010 at 13:27

      @Jens Kreidler

      To detach a view part programatically you need to use internal APIs.

      Look at sample project (https://bugs.eclipse.org/bugs/attachment.cgi?id=133197) from https://bugs.eclipse.org/bugs/show_bug.cgi?id=270212. From the View class, you will find an helping mehod (openDetachedView).

    5. AEHP says:
      June 29, 2010 at 10:01

      I want to resize a RCP view when I resize the window that contains this RCP view.
      Does anyone has ideas?

    6. Jens Kreidler says:
      July 15, 2010 at 07:53

      Thank you Mickael!

    7. AEHP says:
      August 27, 2010 at 14:57

      Hi Elias,

      Thank for your answer.

      Now, I want to share with you this problem, my app show

      Exception in thread “AWT-EventQueue-0″ java.lang.StackOverflowError
      at sun.awt.X11.XlibWrapper.CallErrorHandler(Native Method)
      at sun.awt.X11.XToolkit.SAVED_ERROR_HANDLER(XToolkit.java:125)
      at sun.awt.X11.XToolkit.GlobalErrorHandler(XToolkit.java:136)

      when I attach and detach the views. This is the main code.

      public void createPartControl(Composite parent) {
      this.parent_ = parent;

      parent.addControlListener(new ControlAdapter() {
      @Override
      public void controlResized(ControlEvent e) {
      updateDetached();
      }
      });
      updateDetached();

      composite_ = new Composite( parent, SWT.EMBEDDED );
      display_ = parent.getDisplay();
      display_.asyncExec(new Runnable() {
      public void run() {
      frame_ = SWT_AWT.new_Frame( composite_ );
      }
      });
      }

      I hope to find the solution, it is very important for my project.

      Regards,

      AEHP

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