If an item is clicked to trigger it, clear the rest of the selection

Note that the clearing is not done on mouse press, but on mouse release.
The reason is that there are situations when multiple items are selected
and pressing the mouse on one of them should not clear the selection
(e.g., drag and drop of multiple items).

BUG: 290854
REVIEW: 103703
FIXED-IN: 4.8.0
(cherry picked from commit 9f711b5f2e1d1fd856cd6b033e6adb96f9b46d8a)

2 files changed, 23 insertions, 0 deletions

diff --git a/src/kitemviews/kitemlistcontroller.cpp b/src/kitemviews/kitemlistcontroller.cpp
index d3365ab85..fedbe61a9 100644
--- a/src/kitemviews/kitemlistcontroller.cpp
+++ b/src/kitemviews/kitemlistcontroller.cpp
@@ -43,6 +43,7 @@ KItemListController::KItemListController(QObject* parent) :
     QObject(parent),
     m_singleClickActivation(KGlobalSettings::singleClick()),
     m_selectionTogglePressed(false),
+    m_clearSelectionIfItemsAreNotDragged(false),
     m_selectionBehavior(NoSelection),
     m_model(0),
     m_view(0),
@@ -413,6 +414,13 @@ bool KItemListController::mousePressEvent(QGraphicsSceneMouseEvent* event, const
                                 (!shiftOrControlPressed && !pressedItemAlreadySelected);
     if (clearSelection) {
         m_selectionManager->clearSelection();
+    } else if (pressedItemAlreadySelected && (event->buttons() & Qt::LeftButton)) {
+        // The user might want to start dragging multiple items, but if he clicks the item
+        // in order to trigger it instead, the other selected items must be deselected.
+        // However, we do not know yet what the user is going to do.
+        // -> remember that the user pressed an item which had been selected already and
+        //    clear the selection in mouseReleaseEvent(), unless the items are dragged.
+        m_clearSelectionIfItemsAreNotDragged = true;
     }
 
     if (!shiftPressed) {
@@ -505,7 +513,12 @@ bool KItemListController::mouseMoveEvent(QGraphicsSceneMouseEvent* event, const
                     // done on the mouse-press event, but when using the selection-toggle on a
                     // selected item the dragged item is not selected yet.
                     m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Toggle);
+                } else {
+                    // A selected item has been clicked to drag all selected items
+                    // -> the selection should not be cleared when the mouse button is released.
+                    m_clearSelectionIfItemsAreNotDragged = false;
                 }
+
                 startDragging();
             }
         }
@@ -579,6 +592,14 @@ bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, con
     if (index >= 0 && index == m_pressedIndex) {
         // The release event is done above the same item as the press event
 
+        if (m_clearSelectionIfItemsAreNotDragged) {
+            // A selected item has been clicked, but no drag operation has been started
+            // -> clear the rest of the selection.
+            m_selectionManager->clearSelection();
+            m_selectionManager->setSelected(m_pressedIndex, 1, KItemListSelectionManager::Select);
+            m_selectionManager->beginAnchoredSelection(m_pressedIndex);
+        }
+
         if (event->button() & Qt::LeftButton) {
             bool emitItemActivated = true;
             if (m_view->isAboveExpansionToggle(index, pos)) {
@@ -603,6 +624,7 @@ bool KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent* event, con
 
     m_pressedMousePos = QPointF();
     m_pressedIndex = -1;
+    m_clearSelectionIfItemsAreNotDragged = false;
     return false;
 }
 
diff --git a/src/kitemviews/kitemlistcontroller.h b/src/kitemviews/kitemlistcontroller.h
index b7efbde74..d0e5f72ec 100644
--- a/src/kitemviews/kitemlistcontroller.h
+++ b/src/kitemviews/kitemlistcontroller.h
@@ -260,6 +260,7 @@ private:
 private:
     bool m_singleClickActivation;
     bool m_selectionTogglePressed;
+    bool m_clearSelectionIfItemsAreNotDragged;
     SelectionBehavior m_selectionBehavior;
     KItemModelBase* m_model;
     KItemListView* m_view;