在MainWindow类下有Dialog类和canvasWidget类(继承自QGLWidget类),类声明部分如下:
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
canvasWidget *canvaswidget;
lineDialog *lineDDAdialog;
},
lineDialog类中有个button按钮(私有成员),
请问如何实现点击button按钮后实现canvaswidget的绘图功能(lineDialog类和canvasWidget类没有任何继承的关系)?