zoukankan      html  css  js  c++  java
  • e612. Moving the Focus to the Next or Previous Focusable Component

    The methods to move the focus to the next or to the previous focusable component are Component.transferFocus() and Component.transferFocusBackward().

    This example modifies a component so that pressing the space bar or pressing F2 moves the focus to the next focusable component. Pressing shift space or shift F2 moves the focus to the previous focusable component.

        // Bind space and shift space
        component.getInputMap(JComponent.WHEN_FOCUSED).put(
            KeyStroke.getKeyStroke("SPACE"), nextFocusAction.getValue(Action.NAME));
        component.getInputMap(JComponent.WHEN_FOCUSED).put(
            KeyStroke.getKeyStroke("shift SPACE"), prevFocusAction.getValue(Action.NAME));
        
        // This key binding is required for text components. It hides the
        // default typed space key binding in a text component. If you don't
        // hide this key binding, typing the space key will insert a space into
        // the text component (as well as move the focus).
        // See e1003 覆盖一些和JTextComponent绑定的键 for more details.
        component.getInputMap(JComponent.WHEN_FOCUSED).put(
            KeyStroke.getKeyStroke(new Character(' '), 0), "unbound");
        
        // Bind F2 and shift F2
        component.getInputMap(JComponent.WHEN_FOCUSED).put(
            KeyStroke.getKeyStroke("F2"), nextFocusAction.getValue(Action.NAME));
        component.getInputMap(JComponent.WHEN_FOCUSED).put(
            KeyStroke.getKeyStroke("shift F2"), prevFocusAction.getValue(Action.NAME));
        
        // Add actions
        component.getActionMap().put(nextFocusAction.getValue(Action.NAME), nextFocusAction);
        component.getActionMap().put(prevFocusAction.getValue(Action.NAME), prevFocusAction);
        
        // The actions
        public Action nextFocusAction = new AbstractAction("Move Focus Forwards") {
            public void actionPerformed(ActionEvent evt) {
                ((Component)evt.getSource()).transferFocus();
            }
        };
        public Action prevFocusAction = new AbstractAction("Move Focus Backwards") {
            public void actionPerformed(ActionEvent evt) {
                ((Component)evt.getSource()).transferFocusBackward();
            }
        };
    
    Related Examples
  • 相关阅读:
    UE4_武器4_武器切换(下)
    UE4_武器3_武器切换(上)
    UE4_武器2_矛的攻击与动画
    UE4_武器1_创建武器
    Java知识体系复习笔记
    今日份学习: 毕设。。。。
    笔记:Spring security认证
    一个项目的记录:多人博客
    今日份学习: Spring
    今日份学习:部署?
  • 原文地址:https://www.cnblogs.com/borter/p/9596092.html
Copyright © 2011-2022 走看看