Baseline for wino-mail-dtkqt UI migration

src/ui/maillistview.cpp

@@ -59,6 +59,12 @@ void MailListView::setupUI() {
     m_tableView->setModel(m_proxyModel);
 
     connect(m_tableView, &QTableView::clicked, this, &MailListView::onRowSelected);
+    connect(m_tableView, &QTableView::doubleClicked, this, [this](const QModelIndex &index) {
+        if (!index.isValid()) return;
+        QModelIndex sourceIndex = m_proxyModel->mapToSource(index);
+        int mailId = sourceIndex.data(EmailListModel::IdRole).toInt();
+        emit emailOpenRequested(mailId);
+    });
 
     layout->addWidget(m_tableView);
 }

src/ui/maillistview.h

@@ -21,6 +21,7 @@ public:
 
 signals:
     void emailSelected(int mailId);
+    void emailOpenRequested(int mailId);
     void composeRequested();
 
 private slots:

src/ui/mainmainwindow.cpp

@@ -164,12 +164,21 @@ void MainMainWindow::setupMailPage() {
     m_mailListView = new MailListView();
     connect(m_mailListView, &MailListView::emailSelected, this, &MainMainWindow::onEmailSelected);
     connect(m_mailListView, &MailListView::composeRequested, this, &MainMainWindow::onComposeRequested);
+    connect(m_mailListView, &MailListView::emailOpenRequested, this, [this](int mailId) {
+        openMailInIndependentWindow(mailId);
+    });
     m_folderSplitter->addWidget(m_mailListView);
 
     // Reader
     m_emailViewer = new ReaderView();
     m_emailViewer->setMinimumWidth(350);
     connect(m_emailViewer, &ReaderView::replyRequested, this, &MainMainWindow::onReaderReplyRequested);
+    connect(m_emailViewer, &ReaderView::detachRequested, this, [this]() {
+        std::optional<MailItem> currentItem = MailItemDao::findById(m_emailModel->getCurrentMailId());
+        if (currentItem) {
+            openMailInIndependentWindow(currentItem->id());
+        }
+    });
     m_folderSplitter->addWidget(m_emailViewer);
 
     // Default sizes: folder 240, list 380, reader flex
@@ -248,6 +257,24 @@ void MainMainWindow::onNewMessage() {
     switchToPage(PageCompose);
 }
 
+void MainMainWindow::openMailInIndependentWindow(int mailId) {
+    std::optional<MailItem> item = MailItemDao::findById(mailId);
+    if (!item.has_value()) return;
+
+    QMainWindow *detachedWin = new QMainWindow();
+    detachedWin->setWindowTitle(QString("Mail - %1").arg(item->subject()));
+    
+    ReaderView *detachedReader = new ReaderView();
+    detachedReader->setMailItem(&item.value());
+    
+    detachedWin->setCentralWidget(detachedReader);
+    detachedWin->resize(800, 600);
+    detachedWin->setAttribute(Qt::WA_DeleteOnClose);
+    detachedWin->show();
+    
+    statusBar()->showMessage("Opened mail in independent window", 3000);
+}
+
 void MainMainWindow::createToolBar() {
     m_toolBar = addToolBar("Main Toolbar");
     m_toolBar->setMovable(false);

src/ui/mainmainwindow.h

@@ -34,6 +34,7 @@ private slots:
     void onComposeRequested();
     void onReaderReplyRequested(const MailItem *item);
     void onNewMessage();
+    void openMailInIndependentWindow(int mailId);
 
 private:
     void setupUI();

src/ui/readerview.cpp

@@ -40,9 +40,13 @@ void ReaderView::setupUI() {
     m_forwardButton = new QPushButton("Forward");
     m_deleteButton = new QPushButton("Delete");
     m_deleteButton->setStyleSheet("color: red;");
-
+    
+    QPushButton *m_detachButton = new QPushButton("独立 (Independent)");
+    m_detachButton->setToolTip("Open in separate window");
+    
     actionsLayout->addWidget(m_replyButton);
     actionsLayout->addWidget(m_forwardButton);
+    actionsLayout->addWidget(m_detachButton);
     actionsLayout->addStretch();
     actionsLayout->addWidget(m_deleteButton);
 
@@ -59,6 +63,8 @@ void ReaderView::setupUI() {
     connect(m_replyButton, &QPushButton::clicked, [this]() {
         if (m_bodyViewer->toPlainText().isEmpty()) return;
     });
+
+    connect(m_detachButton, &QPushButton::clicked, this, &ReaderView::detachRequested);
 }
 
 void ReaderView::setMailItem(const MailItem* item) {

src/ui/readerview.h

@@ -21,6 +21,8 @@ signals:
     void replyRequested(const MailItem* item);
     void forwardRequested(const MailItem* item);
     void deleteRequested(const MailItem* item);
+    void detachRequested();
+
 
 private:
     void setupUI();