bVNC单点触控分析

//触屏模式
SimulatedTouchpadInputHandler.onScroll {
        RemotePointer p = canvas.getPointer();
        final int action = e2.getActionMasked();
        final int meta = e2.getMetaState();

        // TODO: This is a workaround for Android 4.2
        //多手指检测
        boolean twoFingers = false;
        if (e1 != null)
            twoFingers = (e1.getPointerCount() > 1);
        if (e2 != null)
            twoFingers = twoFingers || (e2.getPointerCount() > 1);

        // onScroll called while scaling/swiping gesture is in effect. We ignore the event and pretend it was
        // consumed. This prevents the mouse pointer from flailing around while we are scaling.
        // Also, if one releases one finger slightly earlier than the other when scaling, it causes Android
        // to stick a spiteful onScroll with a MASSIVE delta here.
        // This would cause the mouse pointer to jump to another place suddenly.
        // Hence, we ignore onScroll after scaling until we lift all pointers up.
        // 多手指，滑动模式，缩放模式，缩放模式结束
        if (twoFingers||inSwiping||inScaling||scalingJustFinished)
            return true;

        activity.showZoomer(true);

        // If the gesture has just began, then don't allow a big delta to prevent
        // pointer jumps at the start of scrolling.
        if (!inScrolling) {
            inScrolling = true;
            distanceX = sign(distanceX);
            distanceY = sign(distanceY);
        } else {
            // Make distanceX/Y display density independent.
            distanceX = sensitivity * distanceX / displayDensity;
            distanceY = sensitivity * distanceY / displayDensity;
        }

        // Compute the absolute new mouse position on the remote site.
        int newRemoteX = (int) (p.getX() + getDelta(-distanceX));
        int newRemoteY = (int) (p.getY() + getDelta(-distanceY));
        p.processPointerEvent(newRemoteX, newRemoteY, action, meta, false, false, false, false, 0);
        canvas.panToMouse();
        return true;
    }
//SimulatedTouchpadInputHandler.onScale(IBCScaleGestureDetector) line: 1
//ScaleGestureDetector.onTouchEvent(MotionEvent) line: 258
SimulatedTouchpadInputHandler(AbstractGestureInputHandler).onTouchEvent(MotionEvent)
line: 460 {
        //多点触控手势
        scaleGestures.onTouchEvent(e);
    //单点手势
        return gestures.onTouchEvent(e);
    }
//SimulatedTouchpadInputHandler.onTouchEvent(MotionEvent) line: 1
RemoteCanvasActivity.onTouchEvent(MotionEvent) line: 1217 {
    try {
        //activity检测到TouchEvent
     return inputHandler.onTouchEvent(event);
    } catch (NullPointerException e) { }
    return false;
    }