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原生对话框

注意在cmake中查找和链接PrintSupport

• MainWindow.h
• MainWindow.cpp

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QColorDialog>
#include <QFileDialog>
#include <QFontDialog>
#include <QMainWindow>
#include <QMessageBox>
#include <QPrintDialog>
#include <QPrintPreviewDialog>
#include <QPrinter>
#include <QProgressBar>
#include <QPushButton>
#include <QTextEdit>
#include <QVBoxLayout>

class MainWindow : public QMainWindow {
  Q_OBJECT

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

private slots:
  void selectColor();
  void selectFile();
  void selectFont();
  void showMessage();
  void printDocument();
  void previewPrint();
  void updateProgress();

private:
  QVBoxLayout *layout;
  QPushButton *colorButton;
  QPushButton *fileButton;
  QPushButton *fontButton;
  QPushButton *messageButton;
  QPushButton *printButton;
  QPushButton *previewButton;
  QProgressBar *progressBar;
  QTextEdit *textEdit;
  int progressValue;
};

#endif // MAINWINDOW_H

#include "MainWindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), progressValue(0) {
  QWidget *centralWidget = new QWidget(this);
  layout = new QVBoxLayout(centralWidget);

  // 添加控件
  colorButton = new QPushButton("选择颜色", this);
  fileButton = new QPushButton("选择文件", this);
  fontButton = new QPushButton("选择字体", this);
  messageButton = new QPushButton("显示消息", this);
  printButton = new QPushButton("打印", this);
  previewButton = new QPushButton("打印预览", this);
  progressBar = new QProgressBar(this);
  textEdit = new QTextEdit(this);

  layout->addWidget(colorButton);
  layout->addWidget(fileButton);
  layout->addWidget(fontButton);
  layout->addWidget(messageButton);
  layout->addWidget(printButton);
  layout->addWidget(previewButton);
  layout->addWidget(progressBar);
  layout->addWidget(textEdit);

  setCentralWidget(centralWidget);

  // 信号与槽
  connect(colorButton, &QPushButton::clicked, this, &MainWindow::selectColor);
  connect(fileButton, &QPushButton::clicked, this, &MainWindow::selectFile);
  connect(fontButton, &QPushButton::clicked, this, &MainWindow::selectFont);
  connect(messageButton, &QPushButton::clicked, this, &MainWindow::showMessage);
  connect(printButton, &QPushButton::clicked, this, &MainWindow::printDocument);
  connect(previewButton, &QPushButton::clicked, this,
          &MainWindow::previewPrint);
  connect(progressBar, &QProgressBar::valueChanged, this,
          &MainWindow::updateProgress);
}

MainWindow::~MainWindow() {}

void MainWindow::selectColor() {
  QColor color = QColorDialog::getColor(Qt::white, this, "选择颜色");
  if (color.isValid()) {
    textEdit->setTextColor(color);
  }
}

void MainWindow::selectFile() {
  QString fileName = QFileDialog::getOpenFileName(
      this, "选择文件", "", "所有文件 (*.*);;文本文件 (*.txt)");
  if (!fileName.isEmpty()) {
    textEdit->setText(fileName);
  }
}

void MainWindow::selectFont() {
  bool ok;
  QFont font = QFontDialog::getFont(&ok, this);
  if (ok) {
    textEdit->setFont(font);
  }
}

void MainWindow::showMessage() {
  QMessageBox::information(this, "消息框", "这是一个消息框示例！");
}

void MainWindow::printDocument() {
  QPrinter printer;
  QPrintDialog printDialog(&printer, this);
  if (printDialog.exec() == QDialog::Accepted) {
    textEdit->print(&printer);
  }
}

void MainWindow::previewPrint() {
  QPrinter printer;
  QPrintPreviewDialog previewDialog(&printer, this);
  connect(&previewDialog, &QPrintPreviewDialog::paintRequested, this,
          [this, &printer]() { textEdit->print(&printer); });
  previewDialog.exec();
}

void MainWindow::updateProgress() {
  progressValue = (progressValue + 10) % 110;
  progressBar->setValue(progressValue);
}

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