QGraphicsItem中键按下事件

Question

I'm using Qt 5.3 on Linux. I have a QGraphicsScene and a QGraphicsItem. In my QGraphicsItem I implemented mousePressEvent, mouseReleaseEvent, mouseMoveEvent, to catch mouse events.

It works fine, but I have to double click (with middle button) to get a middle button click event which is quite strange. Also I discovered that I don't get any mouse move event when none of the buttons pressed.

I also implemented sceneEvent in my QGraphicsItem but that also misses the mouse move even unless a button is pressed, and only detect my middle button when I double click. I also have a Wacom Intuos, it has (physical) right and middle buttons, the right button works correctly but I also have to double press the middle button to get any mouse press event.

The middle buttons seems working in other applications, and xev reports the events correctly.

Is there any way to to make the at least the middle mouse button work correctly?

Answer 1

要接收鼠标移动事件，您必须在窗口中启用鼠标跟踪

setMouseTracking(true);