QT --- Qt的lineEdit添加鼠标点击事件

1. #ifndef MYLINEEDIT_H
2. #define MYLINEEDIT_H
3. 
4. #include <QWidget>
5. #include <QLineEdit>
6. #include <QMouseEvent>
7. 
8. class myLineEdit : public QLineEdit
9. {
10.     Q_OBJECT
11. public:
12. explicit myLineEdit(QWidget *parent = nullptr);
13. 
14. void mousePressEvent(QMouseEvent *e);
15. 
16. signals:
17. void clicked();
18. 
19. };
20. 
21. #endif // MYLINEEDIT_H

1. #include "mylineedit.h"
2. 
3. myLineEdit::myLineEdit(QWidget *parent) : QLineEdit(parent)
4. {
5. 
6. }
7. 
8. void myLineEdit::mousePressEvent(QMouseEvent *e)
9. {
10. if(e->button() == Qt::LeftButton)    //鼠标左键点击触发signal
11.     {
12.         emit clicked();            
13.     }
14. 
15. }

1. #ifndef MAINWINDOW_H
2. #define MAINWINDOW_H
3. 
4. #include <QMainWindow>
5. 
6. QT_BEGIN_NAMESPACE
7. namespace Ui { class MainWindow; }
8. QT_END_NAMESPACE
9. 
10. class MainWindow : public QMainWindow
11. {
12.     Q_OBJECT
13. 
14. public:
15. MainWindow(QWidget *parent = nullptr);
16.     ~MainWindow();
17. 
18. private:
19.     Ui::MainWindow *ui;
20. 
21. private slots:
22. void lineEditClicked();
23. 
24. 
25. };
26. #endif // MAINWINDOW_H

1. #include "mainwindow.h"
2. #include "ui_mainwindow.h"
3. 
4. #include "mylineedit.h"
5. 
6. MainWindow::MainWindow(QWidget *parent)
7.     : QMainWindow(parent)
8.     , ui(new Ui::MainWindow)
9. {
10.     ui->setupUi(this);
11. 
12.     ui->lineEdit->setText("1");
13. 
14.     connect(ui->lineEdit, SIGNAL(clicked()), this, SLOT(lineEditClicked()));
15. }
16. 
17. void MainWindow::lineEditClicked()
18. {
19.     int t = ui->lineEdit->text().toInt();
20. if(t == 1)
21.     {
22.         ui->lineEdit->setText("0");
23.         ui->lineEdit->setStyleSheet("background-color:gray");
24.     }
25. if(t == 0)
26.     {
27.         ui->lineEdit->setText("1");
28.         ui->lineEdit->setStyleSheet("background-color:red");
29.     }
30. }
31. 
32. MainWindow::~MainWindow()
33. {
34. delete ui;
35. }
36.