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Qt事件Event
1.事件函数event
2.鼠标事件
3.键盘事件
4.窗口大小变化事件
5.重绘事件

重载event

1.bool event(QEvent *e);
2.返回true 处理下一个事件
3.返回false本事件的下一个处理函数

QEvent子类

1.QKeyEvent,QMouseEvent
2.QTouchEvent,QWheelEvent

QWidget重载函数

1.virtual void keyPressEvent(QKeyEvent *event);
2.virtual void keyReleaseEvent(QKeyEvent *event);
3.virtual void leaveEvent(QEvent* event);
4.virtual void mouseDoubleClickEvent(QMouseEvent *event);
5.virtual void mouseMoveEvent(QMouseEvent *Event);
6.virtual void mousePressEvent(QMouseEvent *Event);
7.virtual void mouseReleaseEvent(QMouseEvent *Event);
8.virtual void moveEvent(QMoveEvent *event);
9.virtual void resizeEvent(QResizeEvent *event);
10.virtual void showEvent(QShowEvent *event);
11.virtual void wheelEvent(QWheelEvent *event);
12.virtual void paintEvent(QPaintEvent *event);

QMouseEvent坐标
1.x() y() 相对（本地）坐标
2.QPoint windowPos() 程序窗口坐标
3.screenPos() 屏幕坐标
4.QWidget::mapToGlobal(ev->pos()); 屏幕
5.QCursor::pos()屏幕

QMouseEvent按键状态
1.buttons() & Qt::LeftButton
2.Qt::RightButton Qt::MidButton
3.(me->buttons() & Qt::LeftButton)
&&(me->buttons() & Qt::RightButton)

鼠标事件函数的重载

1.virtual void enterEvent(QEvent *event);
2.virtual void leaveEvent(QEvent *event);
3.virtual void mouseDoubleClickEvent(QMouseEvent *event);
4.virtual void mouseMoveEvent(QMouseEvent *event);
5.virtual void mousePressEvent(QMouseEvent *event);
6.virtual void mouseReleaseEvent(QMouseEvent *event);

xlabel.cpp

#include "xlabel.h"
#include <QDebug>
#include <QMouseEvent>XLabel::XLabel(QWidget* parent): QLabel(parent)
{
}XLabel::~XLabel()
{}bool XLabel::event(QEvent *ev)
{if(ev->type() == QEvent::MouseButtonPress){QMouseEvent *me = static_cast<QMouseEvent*> (ev);//相对坐标qDebug()<<"LocalPos "<<me->x()<<":"<<me->y();//程序坐标qDebug()<<"windowPos "<<me->windowPos().x()<<":"<<me->windowPos().y();//屏幕坐标qDebug()<<"windowPos "<<me->screenPos().x()<<":"<<me->screenPos().y();//本地坐标转全局坐标QPoint gpos =  mapToGlobal(me->pos());qDebug()<<"mapToGlobal "<<gpos.x()<<":"<<gpos.y();//获取鼠标屏幕坐标qDebug()<<"QCursor "<<QCursor::pos().x()<<":"<<QCursor::pos().y();//鼠标按键事件if(me->buttons() & Qt::LeftButton){qDebug()<<"LeftButton";}if(me->buttons() & Qt::RightButton){qDebug()<<"RightButton";}if(me->buttons() & Qt::MiddleButton){qDebug()<<"MidButton";}//左右同时按下if((me->buttons() & Qt::LeftButton) && (me->buttons() & Qt::RightButton)){qDebug()<<"LeftButton and RightButton";}}return QWidget::event(ev);
}

光标的样式

QCursor cursor;
QPixmap pixmap("cursor.png");
//-1,-1表示热点取中间
cursor = QCursor(pixmap,-1,-1);
setCursor(cursor);setCursor(Qt::ArrowCursor);

xlabel.cpp

#include "xlabel.h"
#include <QDebug>
#include <QMouseEvent>XLabel::XLabel(QWidget* parent): QLabel(parent)
{setMouseTracking(true);
}XLabel::~XLabel()
{}bool XLabel::event(QEvent *ev)
{if(ev->type() == QEvent::MouseButtonPress){QMouseEvent *me = static_cast<QMouseEvent*> (ev);//相对坐标qDebug()<<"LocalPos "<<me->x()<<":"<<me->y();//程序坐标qDebug()<<"windowPos "<<me->windowPos().x()<<":"<<me->windowPos().y();//屏幕坐标qDebug()<<"windowPos "<<me->screenPos().x()<<":"<<me->screenPos().y();//本地坐标转全局坐标QPoint gpos =  mapToGlobal(me->pos());qDebug()<<"mapToGlobal "<<gpos.x()<<":"<<gpos.y();//获取鼠标屏幕坐标qDebug()<<"QCursor "<<QCursor::pos().x()<<":"<<QCursor::pos().y();//鼠标按键事件if(me->buttons() & Qt::LeftButton){qDebug()<<"LeftButton";setCursor(Qt::ArrowCursor);}if(me->buttons() & Qt::RightButton){qDebug()<<"RightButton";}if(me->buttons() & Qt::MiddleButton){qDebug()<<"MidButton";}//左右同时按下if((me->buttons() & Qt::LeftButton) && (me->buttons() & Qt::RightButton)){qDebug()<<"LeftButton and RightButton";//鼠标图标替换QPixmap pix("vline.png");QCursor cur = QCursor(pix,-1,-1);setCursor(cur);}}return QWidget::event(ev);
}

ui_widget.h

#ifndef UI_WIDGET_H
#define UI_WIDGET_H#include <QtCore/QVariant>
#include <QtWidgets/QApplication>
#include <QtWidgets/QWidget>
#include "xlabel.h"QT_BEGIN_NAMESPACEclass Ui_Widget
{
public:XLabel *label;void setupUi(QWidget *Widget){if (Widget->objectName().isEmpty())Widget->setObjectName(QString::fromUtf8("Widget"));Widget->resize(800, 600);label = new XLabel(Widget);label->setObjectName(QString::fromUtf8("label"));label->setGeometry(QRect(200, 200, 400, 400));label->setStyleSheet(QString::fromUtf8("background-color: rgb(92, 53, 102);"));retranslateUi(Widget);QMetaObject::connectSlotsByName(Widget);} // setupUivoid retranslateUi(QWidget *Widget){Widget->setWindowTitle(QCoreApplication::translate("Widget", "Widget", nullptr));label->setText(QString());} // retranslateUi};namespace Ui {class Widget: public Ui_Widget {};
} // namespace UiQT_END_NAMESPACE#endif // UI_WIDGET_H

窗口大小改变事件

void resizeEvent(QResizeEvent *event);
if(ev->type() == QEvent::Resize)
const QSize &oldSize() const;
const QSize &size() const;

ui_widget.h

#ifndef UI_WIDGET_H
#define UI_WIDGET_H#include <QtCore/QVariant>
#include <QtWidgets/QApplication>
#include <QtWidgets/QLabel>
#include <QtWidgets/QWidget>QT_BEGIN_NAMESPACEclass Ui_Widget
{
public:QLabel *label;void setupUi(QWidget *Widget){if (Widget->objectName().isEmpty())Widget->setObjectName(QString::fromUtf8("Widget"));Widget->resize(800, 600);label = new QLabel(Widget);label->setObjectName(QString::fromUtf8("label"));label->setGeometry(QRect(0, 30, 800, 670));label->setStyleSheet(QString::fromUtf8("background-color: rgb(92, 53, 102);"));retranslateUi(Widget);QMetaObject::connectSlotsByName(Widget);} // setupUivoid retranslateUi(QWidget *Widget){Widget->setWindowTitle(QCoreApplication::translate("Widget", "Widget", nullptr));label->setText(QString());} // retranslateUi};namespace Ui {class Widget: public Ui_Widget {};
} // namespace UiQT_END_NAMESPACE#endif // UI_WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QResizeEvent>Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);
}bool Widget::event(QEvent *e)
{if(e->type() == QEvent::Resize){QResizeEvent *re = static_cast<QResizeEvent *>(e);qDebug()<<"Resize old "<<re->oldSize().width()<<":"<<re->oldSize().height();qDebug()<<"new size"<<re->size().width()<<":"<<re->size().height();}return QWidget::event(e);
}Widget::~Widget()
{delete ui;
}