官术网_书友最值得收藏!

How it works...

Qt 5 objects, especially the main window, has a dozen of built-in callbacks that exist as virtual functions. These functions can be overridden to perform your intended behavior when called. Qt 5 may invoke these callback functions when its expected condition has been met, such as a keyboard button has been pressed, the mouse cursor has been moved, the window has been resized, and so on.

The functions that we declared in the mainwindow.h file are virtual functions that are built into the QWidget class. We are just overriding it with our own code to define its new behavior when it's called.

Do take note that you must call setMouseTracking(true) for both MainWindow and centralWidget for the mouseMoveEvent() callback to work.

主站蜘蛛池模板: 萍乡市| 乐都县| 玉门市| 白沙| 健康| 舟山市| 镇坪县| 长春市| 化州市| 华宁县| 阿瓦提县| 栾川县| 罗平县| 云龙县| 太白县| 秀山| 甘德县| 伊春市| 成武县| 台北市| 两当县| 边坝县| 镇康县| 东源县| 松溪县| 饶河县| 额尔古纳市| 宜城市| 耒阳市| 昌乐县| 长海县| 启东市| 新巴尔虎左旗| SHOW| 鄂伦春自治旗| 乌拉特后旗| 新闻| 封丘县| 嘉定区| 台山市| 鄯善县|