Examples of org.eclipse.jface.text.IWidgetTokenOwner

org.eclipse.jface.text.IWidgetTokenOwner
In order to display information in a temporary window, a widget token must be acquired. The intent behind this concept is that only one temporary window should be presented at any moment in time and also to avoid overlapping temporary windows. This concept is used by the {@link org.eclipse.jface.text.ITextViewer}.
In order to provide backward compatibility for clients of IWidgetTokenOwner, extension interfaces are used as a means of evolution. The following extension interfaces exist:
- {@link org.eclipse.jface.text.IWidgetTokenOwnerExtension} since version3.0 introducing priorities when requesting a widget token and thus replacing the non-prioritized scheme.
@see org.eclipse.jface.text.IWidgetTokenOwnerExtension @since 2.0

      case PROPOSAL_SELECTOR:
        if (fContentAssistSubjectControl instanceof IWidgetTokenOwnerExtension) {
          IWidgetTokenOwnerExtension extension= (IWidgetTokenOwnerExtension) fContentAssistSubjectControl;
          return extension.requestWidgetToken(this, WIDGET_PRIORITY);
        } else if (fContentAssistSubjectControl instanceof IWidgetTokenOwner) {
          IWidgetTokenOwner owner= (IWidgetTokenOwner) fContentAssistSubjectControl;
          return owner.requestWidgetToken(this);
        } else if (fViewer instanceof IWidgetTokenOwnerExtension) {
          IWidgetTokenOwnerExtension extension= (IWidgetTokenOwnerExtension) fViewer;
          return extension.requestWidgetToken(this, WIDGET_PRIORITY);
        } else if (fViewer instanceof IWidgetTokenOwner) {
          IWidgetTokenOwner owner= (IWidgetTokenOwner) fViewer;
          return owner.requestWidgetToken(this);
        }
    }
    return true;
  }

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   * @param type the listener type
   * @since 2.0
   */
  private void releaseWidgetToken(int type) {
    if (fListeners[CONTEXT_SELECTOR] == null && fListeners[PROPOSAL_SELECTOR] == null) {
      IWidgetTokenOwner owner= null;
      if (fContentAssistSubjectControl instanceof IWidgetTokenOwner)
        owner= (IWidgetTokenOwner) fContentAssistSubjectControl;
      else if (fViewer instanceof IWidgetTokenOwner)
        owner= (IWidgetTokenOwner) fViewer;
      if (owner != null)
        owner.releaseWidgetToken(this);
    }
  }

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    if (fTextViewer instanceof IWidgetTokenOwnerExtension && fTextViewer instanceof IWidgetTokenOwner) {
      IWidgetTokenOwnerExtension extension= (IWidgetTokenOwnerExtension) fTextViewer;
      if (extension.requestWidgetToken(this, WIDGET_PRIORITY))
        super.showInformationControl(subjectArea);
    } else if (fTextViewer instanceof IWidgetTokenOwner) {
      IWidgetTokenOwner owner= (IWidgetTokenOwner) fTextViewer;
      if (owner.requestWidgetToken(this))
        super.showInformationControl(subjectArea);


    } else
      super.showInformationControl(subjectArea);
  }

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  protected void hideInformationControl() {
    try {
      super.hideInformationControl();
    } finally {
      if (fTextViewer instanceof IWidgetTokenOwner) {
        IWidgetTokenOwner owner= (IWidgetTokenOwner) fTextViewer;
        owner.releaseWidgetToken(this);
      }
    }
  }

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  protected void handleInformationControlDisposed() {
    try {
      super.handleInformationControlDisposed();
    } finally {
      if (fTextViewer instanceof IWidgetTokenOwner) {
        IWidgetTokenOwner owner= (IWidgetTokenOwner) fTextViewer;
        owner.releaseWidgetToken(this);
      }
    }
  }

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  private boolean acquireWidgetToken(int type) {
    switch (type) {
      case CONTEXT_SELECTOR:
      case PROPOSAL_SELECTOR:
        if (fViewer instanceof IWidgetTokenOwner) {
          IWidgetTokenOwner owner= (IWidgetTokenOwner) fViewer;
          return owner.requestWidgetToken(this);
        } else if (fViewer instanceof IWidgetTokenOwnerExtension)  {
          IWidgetTokenOwnerExtension extension= (IWidgetTokenOwnerExtension) fViewer;
          return extension.requestWidgetToken(this, WIDGET_PRIORITY);
        }
    }

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   * @since 2.0
   */
  private void releaseWidgetToken(int type) {
    if (fListeners[CONTEXT_SELECTOR] == null && fListeners[PROPOSAL_SELECTOR] == null) {
      if (fViewer instanceof IWidgetTokenOwner) {
        IWidgetTokenOwner owner= (IWidgetTokenOwner) fViewer;
        owner.releaseWidgetToken(this);
      }
    }
  }

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      case PROPOSAL_SELECTOR:
        if (fContentAssistSubjectControl instanceof IWidgetTokenOwnerExtension) {
          IWidgetTokenOwnerExtension extension= (IWidgetTokenOwnerExtension) fContentAssistSubjectControl;
          return extension.requestWidgetToken(this, WIDGET_PRIORITY);
        } else if (fContentAssistSubjectControl instanceof IWidgetTokenOwner) {
          IWidgetTokenOwner owner= (IWidgetTokenOwner) fContentAssistSubjectControl;
          return owner.requestWidgetToken(this);
        } else if (fViewer instanceof IWidgetTokenOwnerExtension) {
          IWidgetTokenOwnerExtension extension= (IWidgetTokenOwnerExtension) fViewer;
          return extension.requestWidgetToken(this, WIDGET_PRIORITY);
        } else if (fViewer instanceof IWidgetTokenOwner) {
          IWidgetTokenOwner owner= (IWidgetTokenOwner) fViewer;
          return owner.requestWidgetToken(this);
        }
    }
    return true;
  }

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   * @param type the listener type
   * @since 2.0
   */
  private void releaseWidgetToken(int type) {
    if (fListeners[CONTEXT_SELECTOR] == null && fListeners[PROPOSAL_SELECTOR] == null) {
      IWidgetTokenOwner owner= null;
      if (fContentAssistSubjectControl instanceof IWidgetTokenOwner)
        owner= (IWidgetTokenOwner) fContentAssistSubjectControl;
      else if (fViewer instanceof IWidgetTokenOwner)
        owner= (IWidgetTokenOwner) fViewer;
      if (owner != null)
        owner.releaseWidgetToken(this);
    }
  }

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            IWidgetTokenOwnerExtension extension = (IWidgetTokenOwnerExtension) fControl;
            if (extension.requestWidgetToken(this, WIDGET_PRIORITY)) {
                super.showInformationControl(subjectArea);
            }
        } else if (fControl instanceof IWidgetTokenOwner) {
            IWidgetTokenOwner owner = (IWidgetTokenOwner) fControl;
            if (owner.requestWidgetToken(this)) {
                super.showInformationControl(subjectArea);
            }


        } else {
            super.showInformationControl(subjectArea);

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