bVNC多点触控分析

时间：2022-10-20 16:39:07

  1. IBCScaleGestureDetector      多点触控手势接口
  2.     DummyScaleGestureDetector 不支持多点触控
  3.     ScaleGestureDetector      支持多点触控
  1. //触屏模式
  2. //先检测缩放模式，再检测滑动模式
  3. simulatedTouchpadInputHandler(AbstractGestureInputHandler).onScale(IBCScaleGestureDetector)
  4. line: 470 {

  6.         boolean consumed = true;

  8.         // Get the current focus.
  9.         xCurrentFocus = detector.getFocusX();
  10.         yCurrentFocus = detector.getFocusY();
  11.         
  12.         // If we haven't started scaling yet, we check whether a swipe is being performed.
  13.         // The arbitrary fudge factor may not be the best way to set a tolerance...
  14.         if (!inScaling) { //缩放模式
  15.             
  16.             // Start swiping mode only after we've moved away from the initial focal point some distance.
  17.             if (!inSwiping) {//滑动模式，移动距离超过40个像素
  18.                 if ( (yCurrentFocus < (yInitialFocus - baseSwipeDist)) ||
  19.                      (yCurrentFocus > (yInitialFocus + baseSwipeDist)) ||
  20.                      (xCurrentFocus < (xInitialFocus - baseSwipeDist)) ||
  21.                      (xCurrentFocus > (xInitialFocus + baseSwipeDist)) ) {
  22.                     inSwiping = true;
  23.                     xPreviousFocus = xInitialFocus;
  24.                     yPreviousFocus = yInitialFocus;
  25.                 }
  26.             }
  27.             
  28.             // If in swiping mode, indicate a swipe at regular intervals.
  29.             if (inSwiping) {
  30.                 twoFingerSwipeUp = false;
  31.                 twoFingerSwipeDown = false;
  32.                 twoFingerSwipeLeft = false;
  33.                 twoFingerSwipeRight = false;
  34.                 if (yCurrentFocus < (yPreviousFocus - baseSwipeDist)) {
  35.                     twoFingerSwipeDown = true;//向下滑动
  36.                     xPreviousFocus = xCurrentFocus;
  37.                     yPreviousFocus = yCurrentFocus;
  38.                 } else if (yCurrentFocus > (yPreviousFocus + baseSwipeDist)) {
  39.                     twoFingerSwipeUp = true;//向上滑动
  40.                     xPreviousFocus = xCurrentFocus;
  41.                     yPreviousFocus = yCurrentFocus;
  42.                 } else if (xCurrentFocus < (xPreviousFocus - baseSwipeDist)) {
  43.                     twoFingerSwipeRight = true;//向右滑动
  44.                     xPreviousFocus = xCurrentFocus;
  45.                     yPreviousFocus = yCurrentFocus;
  46.                 } else if (xCurrentFocus > (xPreviousFocus + baseSwipeDist)) {
  47.                     twoFingerSwipeLeft = true;//向左滑动
  48.                     xPreviousFocus = xCurrentFocus;
  49.                     yPreviousFocus = yCurrentFocus;
  50.                 } else {
  51.                     consumed = false;
  52.                 }
  53.                 // The faster we swipe, the faster we traverse the screen, and hence, the
  54.                 // smaller the time-delta between consumed events. We take the reciprocal
  55.                 // obtain swipeSpeed. If it goes to zero, we set it to at least one.
  56.                 long elapsedTime = detector.getTimeDelta();
  57.                 if (elapsedTime < 10) elapsedTime = 10;
  58.                 
  59.                 swipeSpeed = baseSwipeTime/elapsedTime;
  60.                 if (swipeSpeed == 0) swipeSpeed = 1;
  61.                 if (consumed) Log.d(TAG,"Current swipe speed: " + swipeSpeed);
  62.             }
  63.         }
  64.         
  65.         if (!inSwiping) {
  66.             
  67.             if ( !inScaling && Math.abs(1.0 - detector.getScaleFactor()) < minScaleFactor ) {
  68.                 Log.i(TAG,"Not scaling due to small scale factor.");
  69.                 consumed = false;
  70.             }

  72.             if (consumed) {
  73.                 inScaling = true;
  74.                 Log.i(TAG,"Adjust scaling " + detector.getScaleFactor());
  75.                 if (canvas != null && canvas.scaling != null)
  76.                     canvas.scaling.adjust(activity, detector.getScaleFactor(), xCurrentFocus, yCurrentFocus);
  77.             }
  78.         }
  79.         return consumed;
  80.     }
  81. //SimulatedTouchpadInputHandler.onScale(IBCScaleGestureDetector) line: 1
  82. //ScaleGestureDetector.onTouchEvent(MotionEvent) line: 258
  83. SimulatedTouchpadInputHandler(AbstractGestureInputHandler).onTouchEvent(MotionEvent)
  84. line: 460 {
  85.         //多点触控手势
  86.         scaleGestures.onTouchEvent(e);
  87.         
  88.     }
  89. //SimulatedTouchpadInputHandler.onTouchEvent(MotionEvent) line: 1
  90. RemoteCanvasActivity.onTouchEvent(MotionEvent) line: 1217 {
  91.     try {
  92.         //activity检测到TouchEvent
  93.      return inputHandler.onTouchEvent(event);
  94.     } catch (NullPointerException e) { }
  95.     return false;
  96.     }
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