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Question

我想知道如何确定是否触发了控件的KeyCombination（通过Mnemonic构建）。或者为了简单起见，还有助记符的处理方法？

基本上，我正在使用从Labeled及其Behavior类扩展的自定义控件，我想在触发指定的助记符时执行一些额外的操作。

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所以经过一番挖掘后，我想出了一个简单的想法，就是从KeyEvent听取Scene（但请注意，这只是一个想法。无论如何，我和＃39 ;稍后会弄明白其余部分）。以下是：

public CustomLabeledBehavior(CustomLabeled control) {
  super(control, ...);

  /* IMPORTANT PART */
  // Assume that mnemonicParsing is set to true
  TextBinding tb = new TextBinding(control.getText());
  KeyCombination kc = tb.getMnemonicKeyCombination();

  control.getScene().addEventFilter(KeyEvent.KEY_PRESSED, e -> {
    if (kc.match(e)) {
      System.out.println("MATCHED!");
    }
  });
}

Answer 1

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为了使这个答案比以前更有用，我将向您展示我目前用于确定KeyCombination是否被触发的方法的用法。如果可以的话，我会尽力解释每一个细节。

我们只关注使用自定义控件的Mnemonic属性添加MnemonicParsing。我们将此自定义控件称为CustomLabeled，因为基于该问题，它从Labeled类扩展，因此名称基于它。然后我们将在名为Skin的{{1}}类中进行处理。

＃1 初始化控件：

CustomLabeledSkin

＃2 设置我们的 <CustomLabeled text="_Hello World!" mnemonicParsing="true"/>：

MnemonicHandler

＃3 初始化我们的Skin类：

/* These two variables are initialized from the Constructor. */
private KeyCombination kb; // The combination of keys basically, ALT + Shortcut key
private String shortcut; // The shortcut key itself basically, a Letter key

private boolean altDown = false; // Indicator if the user press ALT key

/**
 * This handler is a convenience variable to easily attach
 * and detach to the Scene's event handlers. This is the
 * whole idea to determine whether the KeyCombination is
 * triggered.
 */
private EventHandler<KeyEvent> mnemonicHandler = new EventHandler<KeyEvent>() {
  @Override
  public void handle(KeyEvent event) {
    // The KeyCombination, basically, the ALT + Shortcut key.
    if (kb.match(event) {
      // TODO: Execute command here.
      event.consume(); // Prevent from further propagation.
      return; // Make sure that the rest won't be executed.
    }
    // While these two functions are for separate event.
    // Example, pressing ALT first before the Shortcut key.
    if (event.isAltDown()) altDown = !altDown;
    if (altDown && event.getCode() == KeyCode.getKeyCode(shortcut)) {
      // TODO: Execute command here.
      event.consume();
    }
  }
}

注意： /** * Constructor */ public CustomLabeledSkin(CustomLabeled control) { // Since this is just an example/testing, we will only assume // that MnemonicParsing is enabled and a valid Mnemonic is // registered. So if you want to validate a mnemonic, you // might want to do it here. TextBinding tb = new TextBinding(control.getText()); kc = tb.getMnemonicKeyCombination(); shortcut = tb.getMnemonic(); // Then we can just filter for a KEY_PRESS from the Scene, then // everything else will be handled by our MnemonicHandler. control.getScene().addEventFilter(KeyEvent.KEY_PRESSED, mnemonicHandler); }类不是公共API的一部分，TextBinding节点使用它来处理助记符。

此外，如果没有分配当前的助记符，您可以创建一个分离Labeled的方法（例如，之前有助记符，然后代码已更改......）。

如何确定是否触发了控件的助记符/键组合？

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1 个答案:

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