GUI: Add macOS shift-click selection handler

PR #22284

src/gui/CMakeLists.txt

@@ -289,6 +289,8 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
         macosdockbadge/badgeview.mm
         macutilities.h
         macutilities.mm
+        macosshiftclickhandler.h
+        macosshiftclickhandler.cpp
     )
     target_link_libraries(qbt_gui PRIVATE objc)
 endif()

src/gui/macosshiftclickhandler.cpp

@@ -0,0 +1,45 @@
+#include "macosshiftclickhandler.h"
+
+#include <QMouseEvent>
+#include "transferlistwidget.h"
+
+MacOSShiftClickHandler::MacOSShiftClickHandler(TransferListWidget *parent)
+    : QObject(parent)
+    , m_treeView(parent)
+{
+    parent->installEventFilter(this);
+}
+
+bool MacOSShiftClickHandler::eventFilter(QObject *watched, QEvent *event)
+{
+    if ((watched == m_treeView) && (event->type() == QEvent::MouseButtonPress))
+    {
+        auto *mouseEvent = static_cast<QMouseEvent *>(event);
+        if (mouseEvent->button() != Qt::LeftButton)
+            return false;
+
+        const QModelIndex clickedIndex = m_treeView->indexAt(mouseEvent->pos());
+        if (!clickedIndex.isValid())
+            return false;
+
+        const Qt::KeyboardModifiers modifiers = mouseEvent->modifiers();
+        const bool shiftPressed = modifiers.testFlag(Qt::ShiftModifier);
+        const bool commandPressed = modifiers.testFlag(Qt::ControlModifier);
+
+        if (shiftPressed && m_lastClickedIndex.isValid())
+        {
+            const QItemSelection selection(m_lastClickedIndex, clickedIndex);
+            if (commandPressed)
+                m_treeView->selectionModel()->select(selection, QItemSelectionModel::Select | QItemSelectionModel::Rows);
+            else
+                m_treeView->selectionModel()->select(selection, QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);
+            m_treeView->selectionModel()->setCurrentIndex(clickedIndex, QItemSelectionModel::NoUpdate);
+            return true;
+        }
+
+        if (!(modifiers & (Qt::AltModifier | Qt::MetaModifier)))
+            m_lastClickedIndex = clickedIndex;
+    }
+
+    return false;
+} 

src/gui/macosshiftclickhandler.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <QObject>
+#include <QPersistentModelIndex>
+
+class TransferListWidget;
+
+// Workaround for QTBUG-115838: Shift-click range selection not working properly on macOS
+class MacOSShiftClickHandler final : public QObject
+{
+    Q_OBJECT
+    Q_DISABLE_COPY_MOVE(MacOSShiftClickHandler)
+
+public:
+    explicit MacOSShiftClickHandler(TransferListWidget *parent);
+
+protected:
+    bool eventFilter(QObject *watched, QEvent *event) override;
+
+private:
+    TransferListWidget *m_treeView;
+    QPersistentModelIndex m_lastClickedIndex;
+}; 

src/gui/transferlistwidget.cpp

@@ -75,6 +75,7 @@
 
 #ifdef Q_OS_MACOS
 #include "macutilities.h"
+#include "macosshiftclickhandler.h"
 #endif
 
 namespace
@@ -158,6 +159,7 @@ TransferListWidget::TransferListWidget(IGUIApplication *app, QWidget *parent)
     setDropIndicatorShown(true);
 #if defined(Q_OS_MACOS)
     setAttribute(Qt::WA_MacShowFocusRect, false);
+    m_shiftClickHandler = new MacOSShiftClickHandler(this);
 #endif
     header()->setFirstSectionMovable(true);
     header()->setStretchLastSection(false);

src/gui/transferlistwidget.h

@@ -52,6 +52,10 @@ enum class CopyInfohashPolicy
     Version2
 };
 
+#ifdef Q_OS_MACOS
+class MacOSShiftClickHandler;  // Forward declaration
+#endif
+
 class TransferListWidget final : public GUIApplicationComponent<QTreeView>
 {
     Q_OBJECT
@@ -137,6 +141,10 @@ private:
     QList<BitTorrent::Torrent *> getVisibleTorrents() const;
     int visibleColumnsCount() const;
 
+#ifdef Q_OS_MACOS
+    MacOSShiftClickHandler *m_shiftClickHandler = nullptr;
+#endif
+
     TransferListModel *m_listModel = nullptr;
     TransferListSortModel *m_sortFilterModel = nullptr;
 };