添加打印机使用的ｄｅｍｏ

andrewbytecoder · andrewbytecoder · commit 40f0003acc6c · 2023-09-19T20:05:11.000+08:00
diff --git a/qt_print/mainwindow.cpp b/qt_print/mainwindow.cpp
@@ -17,11 +17,12 @@ MainWindow::MainWindow(QWidget *parent) :
     QAction *actionPrintPreview = new QAction(tr("打印预览"), this);
     QAction *actionPdf = new QAction(tr("生成pdf"), this);
 
-    connect(actionPrinter, SIGNAL(triggered()), this, SLOT(doPrint));
-    connect(actionPrintPreview, SIGNAL(triggered()), this, SLOT(doPrintPreview));
-    connect(actionPdf, SIGNAL(triggered()), this, SLOT(createPdf));
-
-
+    connect(actionPrinter, &QAction::triggered, this, &MainWindow::doPrint);
+    connect(actionPrintPreview, &QAction::triggered, this, &MainWindow::doPrintPreview);
+    connect(actionPdf, &QAction::triggered, this, &MainWindow::createPdf);
+    ui->mainToolBar->addAction(actionPrinter);
+    ui->mainToolBar->addAction(actionPrintPreview);
+    ui->mainToolBar->addAction(actionPdf);
 }
 
 MainWindow::~MainWindow()
@@ -31,20 +32,50 @@ MainWindow::~MainWindow()
 
 void MainWindow::doPrint()
 {
+    // 定义一个打印机对象
+    QPrinter printer;
+    // 创建打印机对话框
+    QPrintDialog dlg(&printer, this);
+    // 如果文本编辑器中有选中文本区域，则打印选中的区域
+    if (ui->textEdit->textCursor().hasSelection()) {
+        dlg.addEnabledOption(QAbstractPrintDialog::PrintSelection);
+    }
+
+    // 如果按下了打印按钮
+    if (dlg.exec() == QDialog::Accepted) {
+        ui->textEdit->print(&printer);
+    }
 
 }
 
 void MainWindow::doPrintPreview()
 {
-
+    // 定义一个打印机对象
+    QPrinter printer;
+    // 创建预览对话框
+    QPrintPreviewDialog preview(&printer, this);
+    // 发信号给printPreview生成预览界面
+    connect(&preview, &QPrintPreviewDialog::paintRequested, this, &MainWindow::printPreview);
+    // 等待打印界面返回
+    preview.exec();
 }
 
 void MainWindow::printPreview(QPrinter *printer)
 {
+    ui->textEdit->print(printer);
 
 }
 
 void MainWindow::createPdf()
 {
-
+    QString fileName = QFileDialog::getSaveFileName(this, tr("导出PDF文件"), QString(), "*.pdf");
+    if (!fileName.isEmpty()) {
+        if (QFileInfo(fileName).suffix().isEmpty()) {
+            fileName.append(".pdf");
+        }
+        QPrinter printer;
+        printer.setOutputFormat(QPrinter::PdfFormat);
+        printer.setOutputFileName(fileName);
+        ui->textEdit->print(&printer);
+    }
 }
