feat: v0.5.0 —— 导出 PDF（带预览窗口）

导出 - 文件 → 导出 PDF…（Ctrl+E）先弹出预览窗口，确认后点「保存 PDF…」选路径 - A4 纸、16mm 页边距；预览和导出共用同一个 QTextDocument，页宽一致 - 只用 Qt 自带的 QPrinter / QTextDocument，没有引入外部 PDF 库排版 - 新增 MarkdownRenderer：把 Markdown 解析成排版好的富文本文档 - 支持标题、列表 / 任务列表、引用、围栏代码块、行内代码、粗体 / 斜体 / 删除线、链接；图片输出 alt 文字，表格暂按原文 - 代码块带底色、引用带竖线、分隔线画成横线其它 - 用用户更新后的 logo.png 重新生成了 ico / icns / png - docs/screenshot-export.png 与 README 同步
2026-10-22 17:58:01 +08:00
parent c83b4a239c
commit 8cb0702614
13 changed files with 588 additions and 4 deletions
@@ -0,0 +1,107 @@
+#include "ExportDialog.h"
+
+#include "MarkdownRenderer.h"
+
+#include <QDir>
+#include <QFileDialog>
+#include <QFileInfo>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QMessageBox>
+#include <QPageSize>
+#include <QPrinter>
+#include <QPushButton>
+#include <QTextBrowser>
+#include <QTextDocument>
+#include <QVBoxLayout>
+
+ExportDialog::ExportDialog(const QString &markdown, const QString &documentName,
+                           const QString &startDirectory, QWidget *parent)
+    : QDialog(parent)
+    , m_documentName(documentName)
+    , m_startDirectory(startDirectory)
+{
+    setWindowTitle(tr("导出 PDF — %1")
+                       .arg(documentName.isEmpty() ? tr("未命名") : documentName));
+    resize(900, 840);
+
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    layout->setContentsMargins(16, 16, 16, 12);
+    layout->setSpacing(10);
+
+    m_document = new QTextDocument(this);
+    MarkdownRenderer::render(markdown, m_document);
+    // A4 去掉 16mm 页边距后的正文宽度（96dpi 下的像素）：
+    // 预览和打印用同一个页宽，看到的就是导出的样子。
+    m_document->setPageSize(QSizeF(672.76, 1001.57));
+
+    m_preview = new QTextBrowser(this);
+    m_preview->setFrameShape(QFrame::NoFrame);
+    m_preview->setOpenExternalLinks(true);
+    m_preview->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_preview->setFixedWidth(700);
+    m_preview->setDocument(m_document);
+    m_preview->setStyleSheet(QStringLiteral(
+        "QTextBrowser { background: #ffffff; color: #1f2328;"
+        " border: 1px solid #d8dde3; border-radius: 4px; }"));
+
+    QHBoxLayout *center = new QHBoxLayout;
+    center->addStretch(1);
+    center->addWidget(m_preview);
+    center->addStretch(1);
+    layout->addLayout(center, 1);
+
+    QLabel *hint = new QLabel(tr("A4 纸、16mm 页边距，内容和预览一致。"), this);
+    hint->setForegroundRole(QPalette::PlaceholderText);
+
+    QPushButton *saveButton = new QPushButton(tr("保存 PDF…"), this);
+    saveButton->setDefault(true);
+    QPushButton *closeButton = new QPushButton(tr("关闭"), this);
+
+    QHBoxLayout *buttons = new QHBoxLayout;
+    buttons->addWidget(hint);
+    buttons->addStretch(1);
+    buttons->addWidget(closeButton);
+    buttons->addWidget(saveButton);
+    layout->addLayout(buttons);
+
+    connect(closeButton, &QPushButton::clicked, this, &QDialog::reject);
+    connect(saveButton, &QPushButton::clicked, this, &ExportDialog::savePdf);
+}
+
+void ExportDialog::savePdf()
+{
+    QString suggested = m_documentName.isEmpty()
+                            ? tr("未命名")
+                            : QFileInfo(m_documentName).completeBaseName();
+    suggested += QStringLiteral(".pdf");
+
+    QString target = QFileDialog::getSaveFileName(
+        this, tr("保存 PDF"), QDir(m_startDirectory).filePath(suggested),
+        tr("PDF 文件 (*.pdf)"));
+    if (target.isEmpty())
+        return;
+
+    if (!target.endsWith(QStringLiteral(".pdf"), Qt::CaseInsensitive))
+        target += QStringLiteral(".pdf");
+
+    QPrinter printer(QPrinter::HighResolution);
+    printer.setOutputFormat(QPrinter::PdfFormat);
+    printer.setOutputFileName(target);
+    printer.setPageSize(QPageSize(QPageSize::A4));
+    printer.setPageMargins(QMarginsF(16, 16, 16, 16), QPageLayout::Millimeter);
+    printer.setDocName(QFileInfo(target).completeBaseName());
+
+    m_document->print(&printer);
+
+    if (!QFileInfo::exists(target) || QFileInfo(target).size() <= 0) {
+        QMessageBox::warning(this, tr("导出失败"),
+                             tr("没能写出「%1」，换个位置再试一次。")
+                                 .arg(QDir::toNativeSeparators(target)));
+        return;
+    }
+
+    QMessageBox::information(this, tr("导出完成"),
+                             tr("已保存到\n%1").arg(QDir::toNativeSeparators(target)));
+    accept();
+}