发送按键到JTextField [英] Sending keypresses to JTextField

问题描述

我正在尝试将文本输入模拟成一个 JTextField 。我有一个1字符长的字符串，包含我要添加的字母，我运行：

I'm trying to simulate text input into a JTextField. I've got a 1 char long string containing the letter I want to add and I run:

receiver.dispatchEvent(new KeyEvent(this,
  KeyEvent.KEY_TYPED, 0,
  this.shifted?KeyEvent.SHIFT_DOWN_MASK:0,
  KeyEvent.VK_UNDEFINED, text.charAt(0)));

但这似乎根本不改变内容。我在这里缺少什么？

But this doesn't seem to change the contents at all. What am I missing here?

推荐答案

看起来像一个虚拟键盘给我： - ）

Looks like a virtual keyboard to me :-)

几乎完全相同的代码对我有用。我会建议以下内容：

Almost the exact same code does work for me. I would suggest the following:

1. 传递目标 JTextField （in您的案例接收者）作为源参数 KeyEvent 构造函数，即：

1. Pass the target JTextField (in your case, receiver) as the source parameter to the KeyEvent constructor, i.e.:

receiver.dispatchEvent(new KeyEvent(receiver,
    KeyEvent.KEY_TYPED, System.currentTimeMillis(),
    modifiers, KeyEvent.VK_UNDEFINED, keyChar);

确保您的目标

Ensure your target JTextField has the focus.

编辑： JTextField

只是为了验证上述建议，我测试了这段代码：

Just to verify the above suggestion, I tested this snippet of code:

Frame frame = new Frame();
TextField text = new TextField();
frame.add(text);
frame.pack();
frame.setVisible(true);

text.dispatchEvent(new KeyEvent(frame,
        KeyEvent.KEY_TYPED, 0,
        0,
        KeyEvent.VK_UNDEFINED, 'H'));

这样做es不工作，但是如果最后一行被修改如下（目标组件作为 source 参数的 KeyEvent 构造函数），它工作正常：

This does not work, however if the last line is modified as follows (target component as the source parameter of the KeyEvent constructor), it works fine:

text.dispatchEvent(new KeyEvent(text,
        KeyEvent.KEY_TYPED, 0,
        0,
        KeyEvent.VK_UNDEFINED, 'H'));

这篇关于发送按键到JTextField的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！