如何在显示之前将虚拟键盘居中放置在底部 - javafx

Question

如何使键盘在屏幕底部居中？在显示板后，我只有 keyboard/PopupWindow 的尺寸。在调用 show() 之前，每个函数 returns 0.0 用于要求的宽度。如果我之前知道宽度，我可以正确设置位置。键盘尺寸稍后可能会改变，这就是为什么我不能用设定的尺寸来做。我正在使用 fx-onscreen-keyboard

我的小服务：

public class KeyboardService {

private double screenWidth = Screen.getPrimary().getVisualBounds().getWidth();
private double screenHight = Screen.getPrimary().getVisualBounds().getHeight();
private double keyboardPosX = 0.0;
private double keyboardPosY = 0.0; 

private KeyBoardPopup keyboardPopup;

public KeyboardService() {
    keyboardPopup = KeyBoardPopupBuilder.create().initLocale(Locale.GERMAN).build();
    keyboardPopup.setAutoHide(true);
    keyboardPopup.setConsumeAutoHidingEvents(false);
    keyboardPopup.getKeyBoard().setScale(2.5);
    keyboardPopup.getKeyBoard().setLayer(DefaultLayer.DEFAULT);

    keyboardPopup.getKeyBoard().setOnKeyboardCloseButton((e) -> {
        keyboardPopup.hide();
    });

}

public void showKeyboard(Node node){
    keyboardPosX = (screenWidth - keyboardPopup.getWidth())/2;
    //keyboardPosX = (screenWidth - keyboardPopup.getKeyBoard().getWidth())/2;
    keyboardPosY = screenHight;
    keyboardPopup.show(node, keyboardPosX, keyboardPosY);
}}

Answer 1

键盘的宽度是在放置它的弹出窗口布局时定义的，调用 show 后会发生什么。

最简单的方法是监听 KeyBoardPopup 的 widthProperty 以获取新值，然后相应地移动弹出窗口的 window。

这样做：

public KeyboardService() {
    keyboardPopup = KeyBoardPopupBuilder.create().initLocale(Locale.GERMAN).build();
    keyboardPopup.setAutoHide(true);
    keyboardPopup.setConsumeAutoHidingEvents(false);
    keyboardPopup.getKeyBoard().setScale(2.5);
    keyboardPopup.getKeyBoard().setLayer(DefaultLayer.DEFAULT);

    keyboardPopup.getKeyBoard().setOnKeyboardCloseButton((e) -> {
        keyboardPopup.hide();
    });

    // listen to width changes and center 
    keyboardPopup.widthProperty().addListener((obs, ov, nv) -> {
        keyboardPosX = (screenWidth - nv.doubleValue()) / 2d;
        keyboardPopup.getScene().getWindow().setX(keyboardPosX);
    });
}

public void showKeyboard(Node node) {
    keyboardPosX = (screenWidth - keyboardPopup.getWidth())/2;
    keyboardPosY = screenHeight;
    keyboardPopup.show(node, keyboardPosX, keyboardPosY);
}

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