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qwiDgEt showEvEnt

bool QWidget::close() [slot] Closes this widget. Returns true if the widget was closed; otherwise returns false. First it sends the widget a QCloseEvent. The widget is hidden if it accepts the close event. If it ignores the eve...

当调用update(),repaint()的时候,paintEvent()会被调用,当界面有任何改变的时候,paintEvent()也会被调用

A::A(){ //mainwidow=new QMainWindow; // 本身继承了QMainWindow,没必要再new widget=new QWidget; button=new QPushButton; layout=new QHBoxLayout; layout->addWidget(button); widget->setLayout(layout); //mainwidow->setCentralWidget(...

//窗口A #ifndef A_H #define A_H #include #include class A : public QWidget { Q_OBJECT public: explicit A(QWidget *parent = 0); signals: void showB(bool isShow); protected: void mousePressEvent(QMouseEvent *event); public slots:...

关键是这一句setMouseTracking(true);加在构造函数里面,根据qt的帮助文档,mousemoveEvent事件如果mouserTrack为false,那么只有鼠标按下才会执行,而且默认是false,所以需要把窗口事件设置一下 然后就简单了 protected: void mouseMoveEvent(...

你这怎么直接make? 首先确保你的qt装好了,最好通过源直接安装。比如: sudo apt-get install qt4.7 然后 编译一般先: qmake -project qmake make

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