鼠标取色器，取值取色值源码，鼠标全屏幕取点取色。switch(e->type()){caseQEvent::MouseMove:MouseMoveColorPicker((QMouseEvent*)e);break;caseQEvent::MouseButtonPress:m_wid->setCursor(Qt::CrossCursor);break;caseQEvent::MouseButtonRelease:m_wid->setCursor(Qt::ArrowCursor);break;