要求：主屏在左，副屏在右。这种排列情况下鼠标仅可通过主屏的最右侧移入副屏的最左侧，或从副屏的最左侧移入主屏最右侧。

1.RK默认设计

1.1 RK的代码设计是当sys.mouse.presentation=1时，鼠标在屏幕边缘的时候就会移入另一个屏幕

• frameworks/native/services/inputflinger/reader/mapper/CursorInputMapper.cpp

  void CursorInputMapper::sync(nsecs_t when) {
  	...
  	if (mSource == AINPUT_SOURCE_MOUSE) {
  		if (moved || scrolled || buttonsChanged) {
              mPointerController->setPresentation(PointerControllerInterface::PRESENTATION_POINTER);
              if (moved) {
                  mPointerController->move(deltaX, deltaY);
              }
              if (buttonsChanged) {
                  mPointerController->setButtonState(currentButtonState);
              }
              mPointerController->unfade(PointerControllerInterface::TRANSITION_IMMEDIATE);
          }
          mPointerController->getPosition(&xCursorPosition, &yCursorPosition);
          pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_X, xCursorPosition);
          pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, yCursorPosition);
          pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_RELATIVE_X, deltaX);
          pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_RELATIVE_Y, deltaY);
          
          char mMousePresentation[PROPERTY_VALUE_MAX] = {0};
          property_get("sys.mouse.presentation", mMousePresentation, "0");
          if (strcmp(mMousePresentation, "1") == 0) {
              displayId = mDisplayId;
              float minX, minY, maxX, maxY;
              if (mPointerController->getBounds(&minX, &minY, &maxX, &maxY)) {
              	// 如果鼠标位置在屏幕四周边缘，进入另外的屏幕，重新赋值displayId
                  if (xCursorPosition==minX||xCursorPosition==maxX||yCursorPosition==minY||yCursorPosition==maxY{
                      displayId=getPolicy()->notifyDisplayIdChanged();
                      mDisplayId=displayId;
                  }
              }
           }else{
              displayId = mPointerController->getDisplayId();
           }
       } else {
           pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_X, deltaX);
           pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, deltaY);
           displayId = ADISPLAY_ID_NONE;
       }
  }
  

  1.2 鼠标进入不同屏，默认居中显示

  • frameworks/base/libs/input/PointerController.cpp

    void PointerController::setDisplayViewport(const DisplayViewport& viewport) {
    	...
    	// Reset cursor position to center if size or display changed.
        if (oldViewport.displayId != viewport.displayId
                || oldDisplayWidth != newDisplayWidth
                || oldDisplayHeight != newDisplayHeight) {
            float minX, minY, maxX, maxY;
            if (getBoundsLocked(&minX, &minY, &maxX, &maxY)) {
                mLocked.pointerX = (minX + maxX) * 0.5f;
                mLocked.pointerY = (minY + maxY) * 0.5f;
                // Reload icon resources for density may be changed.
                loadResourcesLocked();
            } else {
                mLocked.pointerX = 0;
                mLocked.pointerY = 0;
            }
            fadeOutAndReleaseAllSpotsLocked();
        } else if (oldViewport.orientation != viewport.orientation) {
    }
    

    2.修改鼠标进入方式

    hdmi接入状态

    • /frameworks/base/services/core/java/com/android/server/WiredAccessoryManager.java

      public Pair parseState(ExtconInfo extconInfo, String status) {
      	...
      	 if (status.contains("HDMI")){
      	 	SystemProperties.set("hdmi.plugged", status.contains("HDMI=1") ? "1":"0");
      	 }
      }
      

      2.1 主屏在左，副屏在右边模式下修改鼠标进入方式

      • frameworks/native/services/inputflinger/reader/mapper/CursorInputMapper.cpp

        void CursorInputMapper::sync(nsecs_t when) {
        	...
        	if (mSource == AINPUT_SOURCE_MOUSE) {
                if (moved || scrolled || buttonsChanged) {
                    mPointerController->setPresentation(PointerControllerInterface::PRESENTATION_POINTER);
                    if (moved) {
                        mPointerController->move(deltaX, deltaY);
                    }
                    if (buttonsChanged) {
                        mPointerController->setButtonState(currentButtonState);
                    }
                    mPointerController->unfade(PointerControllerInterface::TRANSITION_IMMEDIATE);
                }
                mPointerController->getPosition(&xCursorPosition, &yCursorPosition);
                pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_X, xCursorPosition);
                pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, yCursorPosition);
                pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_RELATIVE_X, deltaX);
                pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_RELATIVE_Y, deltaY);
                char mMousePresentation[PROPERTY_VALUE_MAX] = {0};
                property_get("sys.mouse.presentation", mMousePresentation, "0");
                if (strcmp(mMousePresentation, "1") == 0) {
                   //displayId = mDisplayId;
                   char mHdmiPlugged[PROPERTY_VALUE_MAX] = {0};
                   property_get("hdmi.plugged", mHdmiPlugged, "0");
                   if (strcmp(mHdmiPlugged, "1") == 0){
                       displayId = mDisplayId;
                   } else {
                   	   // 鼠标在副屏时，拔掉hdmi导致鼠标没有功能，强制id为主屏0
                       displayId = 0;
                   }  
                   
                   float minX, minY, maxX, maxY;
                   
                   if (mPointerController->getBounds(&minX, &minY, &maxX, &maxY)){
                   		// 鼠标在主屏屏幕右边缘位置，重新赋值displayId，位置改变
                        if (displayId == 0 && xCursorPosition==maxX) {
                            displayId=getPolicy()->notifyDisplayIdChanged();
                            mDisplayId=displayId;
                            // 设置鼠标在副屏左侧显示
                            if ((strcmp(mHdmiPlugged, "1") == 0)){
                                mPointerController->setPosition(minX+10, yCursorPosition);
                            }
                        }
                        
        				// 鼠标在副屏屏幕左边缘位置，重新赋值displayId，位置改变（（主屏id默认为0，副屏id切换后递增））
                        if (displayId != 0 && xCursorPosition==minX){
                            displayId=getPolicy()->notifyDisplayIdChanged();
                            mDisplayId=displayId;
                            // 设置鼠标在主屏右侧显示
                            mPointerController->setPosition(maxX-10, yCursorPosition);
                        }
                   } 
              	}else{
                   displayId = mPointerController->getDisplayId();
                }
            } else {
                pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_X, deltaX);
                pointerCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, deltaY);
                displayId = ADISPLAY_ID_NONE;
            }
        }