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: 奉节县| 塔河县| 南靖县| 普安县| 长乐市| 黎平县| 山阴县| 二手房| 弥渡县| 沧州市| 肇源县| 黄冈市| 平安县| 萨嘎县| 台东市| 嘉定区| 鹰潭市| 阳信县| 金昌市| 皮山县| 镇安县| 遂溪县| 桃江县| 沐川县| 揭西县| 赣州市| 东海县| 苍溪县| 界首市| 诸暨市| 阿拉善右旗| 句容市| 惠水县| 将乐县| 南开区| 石柱| 祁连县| 和林格尔县| 离岛区| 雅江县| 邢台县|