如何通过鼠标左键单击swt显示弹出菜单？ [英] How to display a popup menu by mouse left click in swt?

问题描述

如何通过鼠标左键单击显示弹出菜单？我知道默认是鼠标右键。但是我想通过正常选择一个按钮来扩展（显示）菜单。 （通过正常左键单击）。如何通过正常右键弹出弹出式菜单如下。

How to display a popup menu by mouse left click? I know the default is for mouse right click. But I want to expand(display) the menu just by a normal selection of a button. (by normal left click). How to popup a popup menu by normal right click is as follows.

final Button btnNewgroup = new Button(compositeTextClient, SWT.NONE);
Menu menu = new Menu(btnNewgroup);
btnNewgroup.setMenu(menu);
MenuItem mntmNewItem = new MenuItem(menu, SWT.NONE);
mntmNewItem.setText("New Item");
MenuItem mntmNewItem2 = new MenuItem(menu, SWT.NONE);
mntmNewItem2.setText("New Item2");

推荐答案

在按钮上使用选择监听器：

Use a selection listener on the button:

btnNewgroup.addSelectionListener(new SelectionAdapter() {
  @Override
  public void widgetSelected(final SelectionEvent e)
  {
    Rectangle bounds = btnNewgroup.getBounds();

    Point point = btnNewgroup.getParent().toDisplay(bounds.x, bounds.y + bounds.height);

    menu.setLocation(point);

    menu.setVisible(true);
  }
});

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