Reactivate the "Open folders during drag operations" feature

The feature got temporary lost due to the port to the new view
engine.

2 files changed, 97 insertions, 4 deletions

diff --git a/src/kitemviews/kitemlistcontroller.cpp b/src/kitemviews/kitemlistcontroller.cpp
index 60bfef518..746df4d1d 100644
--- a/src/kitemviews/kitemlistcontroller.cpp
+++ b/src/kitemviews/kitemlistcontroller.cpp
@@ -32,6 +32,7 @@
 #include <QEvent>
 #include <QGraphicsSceneEvent>
 #include <QMimeData>
+#include <QTimer>
 
 #include <KGlobalSettings>
 #include <KDebug>
@@ -46,10 +47,16 @@ KItemListController::KItemListController(QObject* parent) :
     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
     m_pressedIndex(-1),
     m_pressedMousePos(),
+    m_autoActivationTimer(0),
     m_oldSelection()
 {
     connect(m_keyboardManager, SIGNAL(changeCurrentItem(QString,bool)),
             this, SLOT(slotChangeCurrentItem(QString,bool)));
+
+    m_autoActivationTimer = new QTimer(this);
+    m_autoActivationTimer->setSingleShot(true);
+    m_autoActivationTimer->setInterval(-1);
+    connect(m_autoActivationTimer, SIGNAL(timeout()), this, SLOT(slotAutoActivationTimeout()));
 }
 
 KItemListController::~KItemListController()
@@ -121,6 +128,16 @@ KItemListController::SelectionBehavior KItemListController::selectionBehavior()
     return m_selectionBehavior;
 }
 
+void KItemListController::setAutoActivationDelay(int delay)
+{
+    m_autoActivationTimer->setInterval(delay);
+}
+
+int KItemListController::autoActivationDelay() const
+{
+    return m_autoActivationTimer->interval();
+}
+
 bool KItemListController::showEvent(QShowEvent* event)
 {
     Q_UNUSED(event);
@@ -217,9 +234,17 @@ bool KItemListController::keyPressEvent(QKeyEvent* event)
         break;
 
     case Qt::Key_Enter:
-    case Qt::Key_Return:
-        emit itemActivated(index);
+    case Qt::Key_Return: {
+        const QSet<int> selectedItems = m_selectionManager->selectedItems();
+        if (selectedItems.count() >= 2) {
+            emit itemsActivated(selectedItems);
+        } else if (selectedItems.count() == 1) {
+            emit itemActivated(selectedItems.toList().first());
+        } else {
+            emit itemActivated(index);
+        }
         break;
+    }
 
     case Qt::Key_Space:
         if (controlPressed) {
@@ -276,6 +301,27 @@ void KItemListController::slotChangeCurrentItem(const QString& text, bool search
     }
 }
 
+void KItemListController::slotAutoActivationTimeout()
+{
+    if (!m_model || !m_view) {
+        return;
+    }
+
+    const int index = m_autoActivationTimer->property("index").toInt();
+    if (index < 0 || index >= m_model->count()) {
+        return;
+    }
+
+    if (m_model->supportsDropping(index)) {
+        if (m_view->supportsItemExpanding() && m_model->isExpandable(index)) {
+            const bool expanded = m_model->isExpanded(index);
+            m_model->setExpanded(index, !expanded);
+        } else {
+            emit itemActivated(index);
+        }
+    }
+}
+
 bool KItemListController::inputMethodEvent(QInputMethodEvent* event)
 {
     Q_UNUSED(event);
@@ -542,8 +588,13 @@ bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, cons
     }
 
     KItemListWidget* oldHoveredWidget = hoveredWidget();
-    KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
+
+    const QPointF pos = transform.map(event->pos());
+    KItemListWidget* newHoveredWidget = widgetForPos(pos);
+
     if (oldHoveredWidget != newHoveredWidget) {
+        m_autoActivationTimer->stop();
+
         if (oldHoveredWidget) {
             oldHoveredWidget->setHovered(false);
             emit itemUnhovered(oldHoveredWidget->index());
@@ -555,6 +606,11 @@ bool KItemListController::dragMoveEvent(QGraphicsSceneDragDropEvent* event, cons
                 newHoveredWidget->setHovered(true);
             }
             emit itemHovered(index);
+
+            if (m_autoActivationTimer->interval() >= 0) {
+                m_autoActivationTimer->setProperty("index", index);
+                m_autoActivationTimer->start();
+            }
         }
     }
 
@@ -568,6 +624,8 @@ bool KItemListController::dropEvent(QGraphicsSceneDragDropEvent* event, const QT
         return false;
     }
 
+    m_autoActivationTimer->stop();
+
     const QPointF pos = transform.map(event->pos());
     const int index = m_view->itemAt(pos);
     emit itemDropEvent(index, event);
@@ -590,7 +648,9 @@ bool KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent* event, const
     }
 
     KItemListWidget* oldHoveredWidget = hoveredWidget();
-    KItemListWidget* newHoveredWidget = widgetForPos(event->pos());
+    const QPointF pos = transform.map(event->pos());
+    KItemListWidget* newHoveredWidget = widgetForPos(pos);
+
     if (oldHoveredWidget != newHoveredWidget) {
         if (oldHoveredWidget) {
             oldHoveredWidget->setHovered(false);
diff --git a/src/kitemviews/kitemlistcontroller.h b/src/kitemviews/kitemlistcontroller.h
index aa2fe2176..29ab6be63 100644
--- a/src/kitemviews/kitemlistcontroller.h
+++ b/src/kitemviews/kitemlistcontroller.h
@@ -86,6 +86,24 @@ public:
     void setSelectionBehavior(SelectionBehavior behavior);
     SelectionBehavior selectionBehavior() const;
 
+    /**
+     * Sets the delay in milliseconds when dragging an object above an item
+     * until the item gets activated automatically. A value of -1 indicates
+     * that no automatic activation will be done at all (= default value).
+     *
+     * The hovered item must support dropping (see KItemModelBase::supportsDropping()),
+     * otherwise the automatic activation is not available.
+     *
+     * After activating the item the signal itemActivated() will be
+     * emitted. If the view supports the expanding of items
+     * (KItemListView::supportsItemExpanding() returns true) and the item
+     * itself is expandable (see KItemModelBase::isExpandable()) then instead
+     * of activating the item it gets expanded instead (see
+     * KItemModelBase::setExpanded()).
+     */
+    void setAutoActivationDelay(int delay);
+    int autoActivationDelay() const;
+
     virtual bool showEvent(QShowEvent* event);
     virtual bool hideEvent(QHideEvent* event);
     virtual bool keyPressEvent(QKeyEvent* event);
@@ -106,7 +124,18 @@ public:
     virtual bool processEvent(QEvent* event, const QTransform& transform);
 
 signals:
+    /**
+     * Is emitted if exactly one item has been activated by e.g. a mouse-click
+     * or by pressing Return/Enter.
+     */
     void itemActivated(int index);
+
+    /**
+     * Is emitted if more than one item has been activated by pressing Return/Enter
+     * when having a selection.
+     */
+    void itemsActivated(const QSet<int>& indexes);
+
     void itemMiddleClicked(int index);
 
     /**
@@ -160,6 +189,8 @@ private slots:
 
     void slotChangeCurrentItem(const QString& text, bool searchFromNextItem);
 
+    void slotAutoActivationTimeout();
+
 private:
     /**
      * Creates a QDrag object and initiates a drag-operation.
@@ -188,6 +219,8 @@ private:
     int m_pressedIndex;
     QPointF m_pressedMousePos;
 
+    QTimer* m_autoActivationTimer;
+
     /**
      * When starting a rubberband selection during a Shift- or Control-key has been
      * pressed the current selection should never be deleted. To be able to restore