界面关闭的事件响应

最近使用了窗口关闭事件：void QWidget::closeEvent ( QCloseEvent * event ) [virtual protected]

当用鼠标点击关闭按钮或者在任务栏上右击关闭，都会触发这一事件，实现效果如下：

附上实现代码：

这是主界面的关闭事件（CallTrace为主界面）

 1 void CallTrace::closeEvent(QCloseEvent *e)
 2 {
 3     closeDialog = new CloseDialog;
 4     closeDialog->move((QApplication::desktop()->width() - closeDialog->width())/2,
 5                       (QApplication::desktop()->height() - closeDialog->height())/2);
 6     closeDialog->exec();
 7     if (closeDialog->m_flag)//先判断没有出错
 8     {
 9         if (closeDialog->m_flag == 3)//窗口不关闭
10             {
11             e->ignore();
12         }
13         else if (closeDialog->m_flag == 2)//立即关闭
14             {
15                 //关闭线程
16                 pTaskInstance->m_CDR.StopCdr();
17                 emit mysig();　　　　　　　　//发射信号，记录窗口及线程状态
18         }
19         else if (closeDialog->m_flag == 1)//隐藏到后台
20         {
21             //什么都不用做
22         }
23     }
24 }

 1 CloseDialog::CloseDialog()
 2 {
 3     m_flag = 0;//窗口关闭选项的初始化
 4     QGroupBox *closeSelection = new QGroupBox(tr("关闭选项"));
 5     hide = new QRadioButton(tr("隐藏到后台"));
 6     hide->setChecked(true);
 7     holdOn = new QRadioButton(tr("立即关闭"));
 8
 9     QVBoxLayout *vLayout1 = new QVBoxLayout;
10     vLayout1->addWidget(hide);
11     vLayout1->addWidget(holdOn);
12     closeSelection->setLayout(vLayout1);
13
14     QHBoxLayout *hLayout1 = new QHBoxLayout;
15     okBtn = new QPushButton(tr("确定"));
16     cancelBtn = new QPushButton(tr("取消"));
17     hLayout1->addStretch();
18     hLayout1->addWidget(okBtn);
19     hLayout1->addSpacing(10);
20     hLayout1->addWidget(cancelBtn);
21     hLayout1->addStretch();
22
23     QHBoxLayout *hLayout2 = new QHBoxLayout;
24     closeCbox = new QCheckBox;
25     closeCbox->setText(tr("默认此选项，以后不再提示"));
26     hLayout2->addWidget(closeCbox);
27
28     QVBoxLayout *mainLayout = new QVBoxLayout;
29     mainLayout->addWidget(closeSelection);
30     mainLayout->addLayout(hLayout2);
31     mainLayout->addLayout(hLayout1);
32
33     setLayout(mainLayout);
34     setWindowTitle(tr("提示"));
35     this->resize(400,200);
36
37     connect(okBtn,SIGNAL(clicked()),this,SLOT(ok_PushButton_Clicked()));
38     connect(cancelBtn,SIGNAL(clicked()),this,SLOT(cancel_PushButton_Clicked()));
39 }

1 //弹出小窗口关闭
2 void CloseDialog::closeEvent(QCloseEvent *e)
3 {
4     if (!m_flag)//若直接关闭对话框，m_flag置3
5         {
6         m_flag = 3;//保持原状态，不关闭
7     }
8 }

//确定按钮 1 void CloseDialog::ok_PushButton_Clicked()
 2 {
 3     if (hide->isChecked())
 4         {
 5         m_flag = 1;//隐藏到后台
 6     }
 7     else if (holdOn->isChecked())
 8         {
 9         m_flag = 2;//立即关闭
10     }
11     this->close();
12 }
13
14 //取消按钮
15 void CloseDialog::cancel_PushButton_Clicked()
16 {
17     m_flag = 3;//保持原状态，不关闭
18     this->close();
19 }

//.h文件 1 class CloseDialog : public QDialog
 2 {
 3     Q_OBJECT
 4 public:
 5     CloseDialog();
 6     ~CloseDialog();
 7
 8 public:
 9     QRadioButton *hide;
10     QRadioButton *holdOn;
11     QPushButton *okBtn;
12     QPushButton *cancelBtn;
13     QCheckBox *closeCbox;
14     int m_flag;                         //标志，记录隐藏窗口还是关闭 1隐藏到后台，2立即关闭，3不改变，0错误
15
16 protected:
17     void closeEvent(QCloseEvent *e);//窗口关闭时调用
18 public slots:
19     void ok_PushButton_Clicked();
20     void cancel_PushButton_Clicked();
21 };

主要就是 closeEvent(QCloseEvent *e)和ignore()函数的使用

界面关闭的事件响应