在多显示器环境中保存JFrame位置 [英] Save JFrame location in multi-display environment

问题描述

当用户关闭JFrame时，我想存储它的位置(bounds，extendedState).但是，当用户将框架移到第二屏幕并将其最大化时，如何存储该信息?我的幼稚(和单个显示)实现是这样的:

I want to store a JFrame's location (bounds, extendedState) when the user closes it. However, when the user moves the frame onto the 2nd screen and maximizes it, how can I store that information? My naive (and single display) implementation is like this:

void saveFrame(JFrame frame) throws IOException {
    Properties props = new Properties();
    props.setProperty("State", String.valueOf(frame.getExtendedState()));
    props.setProperty("X", String.valueOf(frame.getX()));
    props.setProperty("Y", String.valueOf(frame.getY()));
    props.setProperty("W", String.valueOf(frame.getWidth()));
    props.setProperty("H", String.valueOf(frame.getHeight()));
    props.storeToXML(new FileOutputStream("config.xml"), null);
}
void loadFrame(JFrame frame) throws IOException {
    Properties props = new Properties();
    props.loadFromXML(new FileInputStream("config.xml"));
    int extendedState = Integer.parseInt(props.getProperty("State", String.valueOf(frame.getExtendedState())));
    if (extendedState != JFrame.MAXIMIZED_BOTH) {
        frame.setBounds(
            Integer.parseInt(props.getProperty("X", String.valueOf(frame.getX()))),
            Integer.parseInt(props.getProperty("Y", String.valueOf(frame.getY()))),
            Integer.parseInt(props.getProperty("W", String.valueOf(frame.getWidth()))),
            Integer.parseInt(props.getProperty("H", String.valueOf(frame.getHeight())))
        );
    } else {
        frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
    }
}

如何找到框架在哪个屏幕上? 如何将框架移动到第二个屏幕并将其最大化?

How can I discover on which screen the frame is located? How can I move a frame to the second screen and maximize it there?

推荐答案

查找使用的图形设备的ID:

To find the ID of the used graphics device:

frame.getGraphicsConfiguration().getDevice().getIDString()

反之，则可以通过以下方式找到图形设备:

Going the other way, you can find the graphics devices with:

 GraphicsEnvironment.getLocalGraphicsEnvironment().getDevices()

然后可以在JFrame构造函数中使用设备中的配置.我不相信您可以在构建后进行设置.

You can then use a configuration from the device in the JFrame constructor. I don't believe you can set it after construction.

当然，您应该小心，例如，不要改变屏幕的框架，因为分辨率已更改.

Of course, you should be careful not to, say, open the frame off screen because the resolution has change.

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