How to use

okToUse

method

in

org.eclipse.jface.internal.text.link.contentassist.Helper2

/**
 * Returns whether this context information popup is active. I.e., either
 * a context selector or context information is displayed.
 *
 * @return <code>true</code> if the context selector is active
 */
public boolean isActive() {
  return (Helper2.okToUse(fContextInfoPopup) || Helper2.okToUse(fContextSelectorShell));
}

/**
 * Returns whether this context information popup is active. I.e., either
 * a context selector or context information is displayed.
 *
 * @return <code>true</code> if the context selector is active
 */
public boolean isActive() {
  return (Helper2.okToUse(fContextInfoPopup) || Helper2.okToUse(fContextSelectorShell));
}

@Override
public boolean verifyKey(VerifyEvent e) {
  if (Helper2.okToUse(fContextSelectorShell))
    return contextSelectorKeyPressed(e);
  if (Helper2.okToUse(fContextInfoPopup))
    return contextInfoPopupKeyPressed(e);
  return true;
}

  /**
   * Requests the proposal shell to take focus.
   *
   * @since 3.0
   */
  public void setFocus() {
    if (Helper2.okToUse(fProposalShell))
      fProposalShell.setFocus();
  }
}

@Override
public boolean verifyKey(VerifyEvent e) {
  if (Helper2.okToUse(fContextSelectorShell))
    return contextSelectorKeyPressed(e);
  if (Helper2.okToUse(fContextInfoPopup))
    return contextInfoPopupKeyPressed(e);
  return true;
}

  /**
   * Requests the proposal shell to take focus.
   *
   * @since 3.0
   */
  public void setFocus() {
    if (Helper2.okToUse(fProposalShell))
      fProposalShell.setFocus();
  }
}

@Override
public void processEvent(VerifyEvent event) {
  if (Helper2.okToUse(fContextSelectorShell))
    contextSelectorProcessEvent(event);
  if (Helper2.okToUse(fContextInfoPopup))
    contextInfoPopupProcessEvent(event);
}

@Override
public void processEvent(VerifyEvent event) {
  if (Helper2.okToUse(fContextSelectorShell))
    contextSelectorProcessEvent(event);
  if (Helper2.okToUse(fContextInfoPopup))
    contextInfoPopupProcessEvent(event);
}

/**
 * Uninstalls this closer if previously installed.
 */
public void uninstall() {
  fContentAssistant= null;
  if (Helper2.okToUse(fShell))
    fShell.removeShellListener(this);
  fShell= null;
  if (Helper2.okToUse(fScrollbar))
    fScrollbar.removeSelectionListener(this);
  if (Helper2.okToUse(fTable))
    fTable.removeFocusListener(this);
}

/**
 * Uninstalls this closer if previously installed.
 */
public void uninstall() {
  fContentAssistant= null;
  if (Helper2.okToUse(fShell))
    fShell.removeShellListener(this);
  fShell= null;
  if (Helper2.okToUse(fScrollbar))
    fScrollbar.removeSelectionListener(this);
  if (Helper2.okToUse(fTable))
    fTable.removeFocusListener(this);
}

  protected void adjustListeners(int type) {
    switch (type) {
      case LAYOUT_PROPOSAL_SELECTOR:
        if (fContextType == LAYOUT_CONTEXT_SELECTOR &&
            Helper2.okToUse(fShells[LAYOUT_CONTEXT_SELECTOR]))
          // Disable event notification to the tip selector.
          removeContentAssistListener((IContentAssistListener2) fPopups[LAYOUT_CONTEXT_SELECTOR], CONTEXT_SELECTOR);
        break;
      case LAYOUT_CONTEXT_SELECTOR:
        if (Helper2.okToUse(fShells[LAYOUT_PROPOSAL_SELECTOR]))
          // Disable event notification to the proposal selector.
          removeContentAssistListener((IContentAssistListener2) fPopups[LAYOUT_PROPOSAL_SELECTOR], PROPOSAL_SELECTOR);
        break;
      case LAYOUT_CONTEXT_INFO_POPUP:
        break;
    }
  }
}

/**
 *Returns whether the context selector has the focus.
 *
 * @return <code>true</code> if teh context selector has the focus
 */
public boolean hasFocus() {
  if (Helper2.okToUse(fContextSelectorShell))
    return (fContextSelectorShell.isFocusControl() || fContextSelectorTable.isFocusControl());
  return false;
}

/**
 *Returns whether the context selector has the focus.
 *
 * @return <code>true</code> if teh context selector has the focus
 */
public boolean hasFocus() {
  if (Helper2.okToUse(fContextSelectorShell))
    return (fContextSelectorShell.isFocusControl() || fContextSelectorTable.isFocusControl());
  return false;
}

/**
 * Returns whether this popup has the focus.
 *
 * @return <code>true</code> if the popup has the focus
 */
public boolean hasFocus() {
  if (Helper2.okToUse(fProposalShell))
    return (fProposalShell.isFocusControl() || fProposalTable.isFocusControl());
  return false;
}

/**
 * Returns whether this popup has the focus.
 *
 * @return <code>true</code> if the popup has the focus
 */
public boolean hasFocus() {
  if (Helper2.okToUse(fProposalShell))
    return (fProposalShell.isFocusControl() || fProposalTable.isFocusControl());
  return false;
}

@Override
public void focusLost(final FocusEvent e) {
  fScrollbarClicked= false;
  Display d= fTable.getDisplay();
  d.asyncExec(() -> {
    if (Helper2.okToUse(fTable) && !fTable.isFocusControl() && !fScrollbarClicked && fContentAssistant != null)
      fContentAssistant.popupFocusLost(e);
  });
}

/**
 * Hodes the context selector.
 */
private void hideContextSelector() {
  if (Helper2.okToUse(fContextSelectorShell)) {
    fContentAssistant.removeContentAssistListener(this, ContentAssistant2.CONTEXT_SELECTOR);
    fPopupCloser.uninstall();
    fContextSelectorShell.setVisible(false);
    fContextSelectorShell.dispose();
    fContextSelectorShell= null;
  }
  if (!Helper2.okToUse(fContextInfoPopup))
    fContentAssistant.contextInformationClosed();
}

/**
 * Hodes the context selector.
 */
private void hideContextSelector() {
  if (Helper2.okToUse(fContextSelectorShell)) {
    fContentAssistant.removeContentAssistListener(this, ContentAssistant2.CONTEXT_SELECTOR);
    fPopupCloser.uninstall();
    fContextSelectorShell.setVisible(false);
    fContextSelectorShell.dispose();
    fContextSelectorShell= null;
  }
  if (!Helper2.okToUse(fContextInfoPopup))
    fContentAssistant.contextInformationClosed();
}

/**
 * Installs a key listener on the text viewer's widget.
 */
private void installKeyListener() {
  if (!fKeyListenerHooked) {
    StyledText text= fViewer.getTextWidget();
    if (Helper2.okToUse(text)) {
      if (fViewer instanceof ITextViewerExtension) {
        ITextViewerExtension e= (ITextViewerExtension) fViewer;
        e.prependVerifyKeyListener(fInternalListener);
      } else {
        text.addVerifyKeyListener(fInternalListener);
      }
      fKeyListenerHooked= true;
    }
  }
}

/**
 * Uninstall the key listener from the text viewer's widget.
 */
private void uninstallKeyListener() {
  if (fKeyListenerHooked) {
    StyledText text= fViewer.getTextWidget();
    if (Helper2.okToUse(text)) {
      if (fViewer instanceof ITextViewerExtension) {
        ITextViewerExtension e= (ITextViewerExtension) fViewer;
        e.removeVerifyKeyListener(fInternalListener);
      } else {
        text.removeVerifyKeyListener(fInternalListener);
      }
      fKeyListenerHooked= false;
    }
  }
}