在 World Wind 中点击时禁用地球运动 [英] Disable globe movement on click in World Wind

问题描述

我试图在 World Wind 中禁用鼠标点击时地球的移动.我希望能够做到:

void disableGlobeDrag(WorldWindowGLCanvas ww) {ww.addMouseMotionListener(new MyMouseMotionListener());}

其中 MyMouseMotionListener 消耗所有鼠标事件.这不起作用，所以我必须这样做:

void disableGlobeDrag(WorldWindowGLCanvas ww) {for(MouseMotionListener l : ww.getMouseMotionListeners()) {if(l.getClass().toString().equals("class gov.nasa.worldwind.awt.AWTInputHandler")) {ww.removeMouseMotionListener(l);}}}

是否预期消耗的鼠标事件仍应到达 gov.nasa.worldwind.awt.AWTInputHandler 侦听器?

更新: WorldWindowGLCanvas 只是在 java.awt.Component 上调用 addMouseMotionListener() 所以显然我不不了解消费事件的工作原理.

更新 2: 尽管与 Swing 共享接口，但使用 AWTInputHandler 作为参数调用 WorldWindowGLCanvas.removeMouseMotionListener() 作为参数将阻止所有其他 MouseMotionListener 来自接收事件.应改用 AWTInputHandler 上的添加和删除方法.

解决方案

不幸的是，按照 @trashgod 的建议删除 MouseMotionListener 不起作用，因为发生了一些 World Wind 特定行为:删除 gov.nasa.worldwind.awt.AWTInputHandler 导致其他 MouseMotionListener 停止接收事件通知.

要禁用地球拖动并仍然在另一个 MouseMotionListener 中接收事件，需要执行以下步骤:

获取对 World Wind 的 AWTInputHandler 的引用:

AWTInputHandler wwHandler = null;//获取 World Wind 的 AWTInputHandler 类:for (MouseMotionListener l : ww.getMouseMotionListeners()) {if(l instanceof AWTInputHandler) {wwHandler = (AWTInputHandler)l;休息;}}

创建一个使用事件的MouseMotionListener:

public class MyMouseMotionListener 实现 MouseMotionListener {@覆盖public void mouseDragged(MouseEvent e) {//消耗事件，所以地球位置不会改变e.consum();if (e.getSource() instanceof WorldWindowGLCanvas) {//获取鼠标位置final WorldWindowGLCanvas canvas = ((WorldWindowGLCanvas) e.getSource());最终位置 p = canvas.getCurrentPosition();//对这里的位置做一些事情}}@覆盖public void mouseMoved(MouseEvent e) {e.consum();}}

在AWTInputHandler中添加鼠标动作监听器:

if(wwHandler != null) {wwHandler.addMouseMotionListener(new MyMouseMotionListener());} 别的 {//我不认为这应该发生，除非 AWTInputHandler//被客户端代码显式删除logger.error("找不到AWTInputHandler");}

也就是说，我不知道为什么 WorldWindowGLCanvas 使用 Component.addMouseMotionListener() 而不是 AWTInputHandler.addMouseMotionListener().>

I am trying to disable movement of the globe on mouse click in World Wind. I expected to be able to do:

void disableGlobeDrag(WorldWindowGLCanvas ww) {
    ww.addMouseMotionListener(new MyMouseMotionListener());
}

where MyMouseMotionListener consumes all of the mouse events. This is not working so instead I have to do:

void disableGlobeDrag(WorldWindowGLCanvas ww) {
    for(MouseMotionListener l : ww.getMouseMotionListeners()) {
        if(l.getClass().toString().equals("class gov.nasa.worldwind.awt.AWTInputHandler")) {
            ww.removeMouseMotionListener(l);
        }
    }
}

Is it expected that consumed mouse events should still reach the gov.nasa.worldwind.awt.AWTInputHandler listener?

Update: WorldWindowGLCanvas is just calling addMouseMotionListener() on java.awt.Component so apparently I don't understand how consuming events works.

Update 2: despite sharing interfaces with Swing, calling WorldWindowGLCanvas.removeMouseMotionListener() with AWTInputHandler as the argument will prevent all other MouseMotionListeners from receiving events. The add and remove methods on AWTInputHandler should be used instead.

解决方案

Unfortunately removing the MouseMotionListener as @trashgod suggested does not work since there is some World Wind specific behavior happening: removing gov.nasa.worldwind.awt.AWTInputHandler causes other MouseMotionListeners to stop receiving event notifications.

To disable globe dragging and still receive events in another MouseMotionListener the following steps were necessary:

Get a reference to World Wind's AWTInputHandler:

AWTInputHandler wwHandler = null;
// get World Wind's AWTInputHandler class:
for (MouseMotionListener l : ww.getMouseMotionListeners()) {
    if(l instanceof AWTInputHandler) {
        wwHandler = (AWTInputHandler)l;
        break;
    }
}

Create a MouseMotionListener which consumes events:

public class MyMouseMotionListener implements MouseMotionListener {
    @Override
    public void mouseDragged(MouseEvent e) {
        // consume the event so the globe position does not change
        e.consume();
        if (e.getSource() instanceof WorldWindowGLCanvas) {
            // get the position of the mouse
            final WorldWindowGLCanvas canvas = ((WorldWindowGLCanvas) e.getSource());
            final Position p = canvas.getCurrentPosition();
            // do something with the position here
        }
    }
    @Override
    public void mouseMoved(MouseEvent e) {
        e.consume();
    }
}

Add the mouse motion listener to the AWTInputHandler:

if(wwHandler != null) {
    wwHandler.addMouseMotionListener(new MyMouseMotionListener());
} else {
    // I don't think this should happen unless the AWTInputHandler
    // is explicitly removed by client code
    logger.error("Couldn't find AWTInputHandler");
}

That said, I have no idea why WorldWindowGLCanvas is using Component.addMouseMotionListener() rather than AWTInputHandler.addMouseMotionListener().

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