qt 数字输入控件，用于触摸屏的文字输入

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1.概要

qt 数字输入控件，用于触摸屏的文字输入

2.代码

2.1 弹窗控件和输入框

#include <QLineEdit>
#include <QDialog>
#include <QPushButton>
#include <QGridLayout>
#include <QHBoxLayout>
#include <QVBoxLayout>

class CustomDialog : public QDialog {
    Q_OBJECT
public:
    CustomDialog(QLineEdit *lineEdit, QWidget *parent = nullptr) : QDialog(parent), lineEdit(lineEdit) {
        QGridLayout *gridLayout = new QGridLayout;
        for (int i = 0; i < 4; ++i) {
            for (int j = 0; j < 3; ++j) {
                if (i == 3 && j == 2) break; // Skip the last cell for OK button
                int number = i * 3 + j;
                if (number == 9) number = -1; // Use -1 as a sentinel for the backspace button
                QPushButton *button = new QPushButton(number == -1 ? "Backspace" : QString::number(number), this);
                gridLayout->addWidget(button, i, j);
                connect(button, &QPushButton::clicked, this, [this, number]() {
                    if (number == -1) {
                        // Backspace functionality
                        //lineEdit->text();
                        QString text = this->lineEdit->text();
                        if (!text.isEmpty()) {
                            this->lineEdit->setText(text.left(text.length() - 1));
                        }
                    } else {
                        // Append number to the line edit
                        this->lineEdit->setText(this->lineEdit->text() + QString::number(number));
                    }
                });
            }
        }

        QPushButton *okButton = new QPushButton("OK", this);
        gridLayout->addWidget(okButton, 3, 2, 1, 1);
        connect(okButton, &QPushButton::clicked, this, &CustomDialog::accept);

        setLayout(gridLayout);
    }

private:
    QLineEdit *lineEdit;
};

class CustomLineEdit : public QLineEdit {
    Q_OBJECT
public:
    CustomLineEdit(QWidget *parent = nullptr) : QLineEdit(parent) {
        connect(this, &CustomLineEdit::mousePressed, this, &CustomLineEdit::onMousePressed);
    }

protected:
    void mousePressEvent(QMouseEvent *event) override {
        QLineEdit::mousePressEvent(event);
        emit mousePressed();
    }

private slots:
    void onMousePressed() {
        CustomDialog dialog(this);
        dialog.exec();
    }

signals:
    void mousePressed();
};

2.2 窗口代码

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "./ui_mainwindow.h"
#include "NumberDialog.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    CustomLineEdit* my = new CustomLineEdit(this);
    //my->setText("ddddd");
}

MainWindow::~MainWindow()
{
    delete ui;
}

2.3 主函数

#include "mainwindow.h"

#include <QApplication>


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}