/**
* Sets the receiver's tool tip text to the argument, which may be null indicating that the
* default tool tip for the control will be shown. For a menu item that has a default tool tip,
* setting the tool tip text to an empty string replaces the default, causing no tool tip text to
* be shown.
*
* <p>The mnemonic indicator (character '&') is not displayed in a tool tip. To display a
* single '&' in the tool tip, the character '&' can be escaped by doubling it in the
* string.
*
* <p>NOTE: Tooltips are currently not shown for top-level menu items in the {@link
* Shell#setMenuBar(Menu) shell menubar} on Windows, Mac, and Ubuntu Unity desktop.
*
* @param toolTip the new tool tip text (or null)
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*
* @since 3.104
*/
public void setToolTipText(String toolTip) {
checkWidget();
if (toolTip == null && itemToolTip != null) {
itemToolTip.setVisible(false);
itemToolTip = null;
}
if (toolTip == null
|| toolTip.trim().length() == 0
|| (itemToolTip != null && toolTip.equals(itemToolTip.getMessage()))) return;
itemToolTip = new MenuItemToolTip(this.getParent().getShell());
itemToolTip.setMessage(toolTip);
itemToolTip.setVisible(false);
}
void hideToolTip() {
if (itemToolTip == null) return;
itemToolTip.setVisible(false);
}
void showTooltip(int x, int y) {
if (itemToolTip == null) return;
itemToolTip.setLocation(x, y);
itemToolTip.setVisible(true);
}