Accept file drops across the channel footer

tools/chatgui/src/channellist.cpp

@@ -13,6 +13,9 @@
 #include <QMouseEvent>
 #include <QMenu>
 #include <QStyle>
+#include <QDropEvent>
+#include <QMimeData>
+#include <QUrl>
 
 extern "C" {
 #include "../../lib/debug_config.h"
@@ -175,6 +178,7 @@ ChannelList::ChannelList(DbManager* db, QWidget *parent)
     layout->addWidget(m_listView);
 
     auto *footer = new QWidget(this);
+    m_footer = footer; m_footer->setObjectName("channelFooter");
     auto *fl = new QHBoxLayout(footer);
     fl->setContentsMargins(6, 4, 6, 4);
     fl->setSpacing(6);
@@ -240,6 +244,12 @@ ChannelList::ChannelList(DbManager* db, QWidget *parent)
     fl->addWidget(plusBtn);
 
     layout->addWidget(footer);
+    auto targets = footer->findChildren<QWidget*>(); targets.append(footer);
+    for (auto* target : targets) { target->setAcceptDrops(true); target->installEventFilter(this); }
+    m_dropHint = new QLabel(footer); m_dropHint->setObjectName("ownFilesDropHint");
+    m_dropHint->setAttribute(Qt::WA_TransparentForMouseEvents); m_dropHint->setAlignment(Qt::AlignCenter);
+    m_dropHint->setStyleSheet("QLabel { border: 2px dashed palette(highlight); background: palette(window); color: palette(text); }");
+    m_dropHint->hide();
 
     connect(m_listView->selectionModel(), &QItemSelectionModel::currentChanged,
             this, [this](const QModelIndex &current, const QModelIndex &) {
@@ -266,6 +276,46 @@ ChannelList::ChannelList(DbManager* db, QWidget *parent)
     });
 }
 
+bool ChannelList::eventFilter(QObject* target, QEvent* event) {
+    if (event->type() == QEvent::DragLeave) { m_dropHint->hide(); return true; }
+    if (event->type() != QEvent::DragEnter && event->type() != QEvent::DragMove && event->type() != QEvent::Drop)
+        return QWidget::eventFilter(target, event);
+    auto* drop = static_cast<QDropEvent*>(event);
+    QString channel = m_listView->currentIndex().data(ChannelChannelIdRole).toString();
+    QString reason;
+    if (!channel.toULongLong()) reason = QCoreApplication::translate("ChatGui", "Select a group to upload files");
+    else if (!m_db || !m_db->myNodeId() || !gui_bridge_is_uasync_ready())
+        reason = QCoreApplication::translate("ChatGui", "Upload unavailable");
+    else if (!drop->mimeData()->hasUrls() || drop->mimeData()->urls().isEmpty() || !(drop->possibleActions() & Qt::CopyAction))
+        reason = QCoreApplication::translate("ChatGui", "Drop local files to copy");
+    QStringList paths;
+    if (reason.isEmpty()) for (const auto& url : drop->mimeData()->urls()) {
+        if (!url.isLocalFile() || url.toLocalFile().isEmpty()) {
+            reason = QCoreApplication::translate("ChatGui", "Only local files can be uploaded"); break;
+        }
+        paths.append(url.toLocalFile());
+    }
+    if (event->type() == QEvent::Drop) m_dropHint->hide();
+    else {
+        m_dropHint->setGeometry(m_footer->rect());
+        m_dropHint->setText(reason.isEmpty() ? QCoreApplication::translate("ChatGui", "Copy to my files") : reason);
+        m_dropHint->show(); m_dropHint->raise();
+    }
+    if (!reason.isEmpty()) {
+        if (event->type() != QEvent::DragMove)
+            DEBUG_WARN(DEBUG_CATEGORY_MEDIA, "file drop: rejected channel=%s reason=%s", qPrintable(channel), qPrintable(reason));
+        drop->ignore();
+        // После отклонённого DragEnter Qt не гарантирует DragLeave.
+        m_dropHint->hide(); return true;
+    }
+    drop->setDropAction(Qt::CopyAction); drop->accept();
+    if (event->type() == QEvent::Drop) {
+        DEBUG_INFO(DEBUG_CATEGORY_MEDIA, "file drop: accepted channel=%s files=%d", qPrintable(channel), int(paths.size()));
+        QTimer::singleShot(0, this, [this, channel, paths] { emit ownFilesDropped(channel, paths); });
+    }
+    return true;
+}
+
 void ChannelList::refreshDmPresence() {
     if (!m_dmPresenceTimer->isActive()) m_dmPresenceTimer->start();
 }

tools/chatgui/src/channellist.h

@@ -6,11 +6,13 @@
 #include <QListView>
 #include <QStandardItemModel>
 #include <QString>
+#include <QStringList>
 #include <QHash>
 #include <QTimer>
 
 class DbManager;
 class QPushButton;
+class QLabel;
 
 class ChannelList : public QWidget {
     Q_OBJECT
@@ -34,16 +36,22 @@ signals:
     void channelSettingsRequested(const QString& channelId);
     void filesRequested(const QString& channelId);
     void ownFilesRequested(const QString& channelId);
+    void ownFilesDropped(const QString& channelId, const QStringList& paths);
     void joinRequested();
     void createGroupRequested();
     void settingsRequested();
     void connMonitorRequested();
 
+protected:
+    bool eventFilter(QObject* target, QEvent* event) override;
+
 private:
     QListView          *m_listView;
     QStandardItemModel *m_model;
     DbManager          *m_db;
     QPushButton        *m_ownFilesButton;
+    QWidget            *m_footer;
+    QLabel             *m_dropHint;
     bool                m_autoConnectActive = false;
     QHash<QString, bool> m_dmOnline;
     QTimer* m_dmPresenceTimer;

tools/chatgui/src/mainwindow.cpp

@@ -621,6 +621,11 @@ void MainWindow::setupConnects() {
                    qPrintable(channel), (unsigned long long)owner);
         showMemberFiles(channel, owner);
     });
+    connect(m_channelList, &ChannelList::ownFilesDropped, this, [this](const QString& channel, const QStringList& paths) {
+        if (!m_fileBrowser) m_fileBrowser = new MemberFileBrowser(m_db, this);
+        m_fileBrowser->show(); m_fileBrowser->raise(); m_fileBrowser->activateWindow();
+        m_fileBrowser->uploadOwnFiles(channel, paths);
+    });
     connect(m_accountList, &AccountList::callRequested, this, &MainWindow::onCallRequested);
     connect(m_messageList, &MessageList::callRequested, this, &MainWindow::onCallRequested);
     connect(m_accountList, &AccountList::pmRequested, this, &MainWindow::onPmRequested);