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<Integer, Integer> 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;
    }
}