java - Vaadin ColorPicker IllegalArgumentException

Question

我已经下载了 Vaadin Colorpicker 插件来尝试一下，如果我点击 colorPicker“按钮”两次，就会出现一个 IllegalArgumentException :

异常

java.lang.IllegalArgumentException: Window was already added to application - it can not be added to another window also.
    at com.vaadin.ui.Window.addWindow(Window.java:1447)
    at com.vaadin.addon.colorpicker.ColorPicker.changeVariables(Unknown Source)
    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariableBurst(AbstractCommunicationManager.java:1299)
    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1219)
    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:735)

另一个问题:

如果我单击菜单中的某个项目，我希望弹出 colorPicker 窗口，就像单击“设置颜色”一样，我会弹出 colorPicker 窗口。在我的 GUI 上放置按钮非常困难:P

编辑:

我像这样添加 ColorPicker :

    colorPicker = new ColorPicker();
    colorPicker.setButtonCaption("Set Color");
    colorPicker.setRGBVisibility(false);
    colorPicker.setHSVVisibility(false);
    colorPicker.setHistoryVisibility(false);
    colorPicker.addListener(this);
    window.addComponent(colorPicker);

Answer 1

我认为您应该在应用程序中尝试此代码:

public class MyApplication extends Application {

    @Override
    public void init() {
        Window mainWindow = new Window("Your Application");

        // Create a color picker
        ColorPicker cp = new ColorPicker("ColorPicker", Color.RED);

        // Add a color change listener to the color picker
        cp.addListener(new ColorPicker.ColorChangeListener() {
            @Override
            public void colorChanged(ColorChangeEvent event) {
                MyApplication.this.getMainWindow()
                .showNotification("Color changed!");
            }
        });

        mainWindow.addComponent(cp);
        setMainWindow(mainWindow);
    }
}

如果它不起作用，则 ColorPicker 存在缺陷(您可以在此处报告缺陷: http://dev.vaadin.com/ )。

如果上面的代码有效，那么问题就出在您的代码中(在这种情况下，请与我们分享更多您的代码 - 您甚至可以共享整个类)。