我有两个类:
typedef std::shared_ptr<AdaptedWidget> window_ptr;
class WindowManager
{
public:
...
private:
std::stack<window_ptr> m_windowsStack;
}
和
class AdaptedWidget: public QWidget
{
Q_OBJECT
public:
AdaptedWidget(AdaptedWidget *parent = 0);
bool event(QEvent *event);
};
bool AdaptedWidget::event(QEvent *event)
{
if (event->type() == QEvent::NonClientAreaMouseButtonPress ||
event->type() == QEvent::MouseButtonPress)
{
qDebug() << "mainwindwo press";
}
return QWidget::event(event);
}
我需要从我的 WindowManager
对象中获取有关 AdaptedWidget
对象中发生的事件的信息,我该怎么做?
最佳答案
Event filters是完成任务的 Qt 方式。
使您的 WindowManager
类成为 QObject
的子类,并为其提供一个实现 eventFilter()
方法。
之后,每次创建 AdaptedWidget
时使用 installEventFilter()
将您的 WindowManager
实例安装为它的事件过滤器。
class WindowManager : public QObject
{
public:
...
bool eventFilter(QObject* obj, QEvent* ev);
private:
std::stack<window_ptr> m_windowsStack;
}
和
bool WindowManager::eventFilter(QObject* obj, QEvent* ev){
AdaptedWidget* widget= qobject_cast<AdaptedWidget*>(obj);
if(ev->type == /*type of event you are interested in*/){
//you can compare widget against the stack of widgets you have
//if you want to stop widget from receiving the event you can return true
}
return false;
}
并且在创建每个 AdaptedWidget
实例时,安装 WindowManager
作为事件过滤器:
AdaptedWidget* widget= new AdaptedWidget;
widget->installEventFilter(/*your WindowManager instance*/);
关于c++ - 了解其他类(class)发生的事件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41188135/