Enable Event drag&drop in LTMSidebar to allow reordering

Fixes GoldenCheetah#565

src/Core/Season.cpp

@@ -693,3 +693,28 @@ void EditPhaseDialog::nameChanged()
 {
     applyButton->setEnabled(!nameEdit->text().isEmpty());
 }
+
+SeasonEventTreeView::SeasonEventTreeView()
+{
+    setDragDropMode(QAbstractItemView::InternalMove);
+    setDragDropOverwriteMode(true);
+}
+
+void
+SeasonEventTreeView::dropEvent(QDropEvent* event)
+{
+    // get the list of the items that are about to be dropped
+    QTreeWidgetItem* item = selectedItems()[0];
+
+    // row we started on
+    int idx1 = indexFromItem(item).row();
+
+    // the default implementation takes care of the actual move inside the tree
+    QTreeWidget::dropEvent(event);
+
+    // moved to !
+    int idx2 = indexFromItem(item).row();
+
+    // notify subscribers in some useful way
+    Q_EMIT itemMoved(item, idx1, idx2);
+}

src/Core/Season.h

@@ -228,4 +228,17 @@ class EditPhaseDialog : public QDialog
         QDoubleSpinBox *lowEdit;
 };
 
+class SeasonEventTreeView : public QTreeWidget
+{
+    Q_OBJECT
+
+    public:
+        SeasonEventTreeView();
+
+    signals:
+        void itemMoved(QTreeWidgetItem* item, int previous, int actual);
+
+    protected:
+        void dropEvent(QDropEvent* event);
+};
 #endif /* SEASON_H_ */

src/Gui/LTMSidebar.cpp

@@ -103,9 +103,11 @@ LTMSidebar::LTMSidebar(Context *context) : QWidget(context->mainWindow), context
     eventsWidget->addAction(moreEventAct);
     connect(moreEventAct, SIGNAL(triggered(void)), this, SLOT(eventPopup(void)));
 
-    eventTree = new QTreeWidget;
+    eventTree = new SeasonEventTreeView;
     eventTree->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     allEvents = eventTree->invisibleRootItem();
+    // Drop for Events
+    allEvents->setFlags(Qt::ItemIsEnabled | Qt::ItemIsDropEnabled);
     allEvents->setText(0, tr("Events"));
     eventTree->setFrameStyle(QFrame::NoFrame);
     eventTree->setColumnCount(2);
@@ -229,6 +231,7 @@ LTMSidebar::LTMSidebar(Context *context) : QWidget(context->mainWindow), context
 
     // events
     connect(eventTree,SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(eventPopup(const QPoint &)));
+    connect(eventTree,SIGNAL(itemMoved(QTreeWidgetItem *,int, int)), this, SLOT(eventMoved(QTreeWidgetItem*, int, int)));
 
     // presets
     connect(chartTree,SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(presetPopup(const QPoint &)));
@@ -360,6 +363,7 @@ LTMSidebar::dateRangeTreeWidgetSelectionChanged()
         for (i=0; i <dateRange->events.count(); i++) {
             SeasonEvent event = dateRange->events.at(i);
             QTreeWidgetItem *add = new QTreeWidgetItem(allEvents);
+            add->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsDragEnabled);
             add->setText(0, event.name);
             add->setText(1, event.date.toString("MMM d, yyyy"));
         }
@@ -1275,6 +1279,7 @@ LTMSidebar::addEvent()
         seasons->seasons[seasonindex].events.append(myevent);
 
         QTreeWidgetItem *add = new QTreeWidgetItem(allEvents);
+        add->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsDragEnabled);
         add->setText(0, myevent.name);
         add->setText(1, myevent.date.toString("MMM d, yyyy"));
 
@@ -1358,6 +1363,36 @@ LTMSidebar::editEvent()
     active = false;
 }
 
+void
+LTMSidebar::eventMoved(QTreeWidgetItem*item, int oldposition, int newposition)
+{
+    active = true;
+
+    if (dateRangeTree->selectedItems().count()) {
+
+        // if a phase is selected (rather than a season), get the season this phase belongs to
+        QTreeWidgetItem *selectedDateRange = dateRangeTree->selectedItems().first();
+        if (selectedDateRange->parent() != NULL) {
+            selectedDateRange = selectedDateRange->parent();
+        }
+
+        int seasonindex = allDateRanges->indexOfChild(selectedDateRange);
+
+        // report the move in the seasons
+        seasons->seasons[seasonindex].events.move(oldposition, newposition);
+
+        // save changes away
+        seasons->writeSeasons();
+
+        // deselect actual selection
+        eventTree->selectedItems().first()->setSelected(false);
+        // select the move/drop item
+        item->setSelected(true);
+    }
+
+    active = false;
+}
+
 void
 LTMSidebar::addPhase()
 {

src/Gui/LTMSidebar.h

@@ -69,6 +69,7 @@ class LTMSidebar : public QWidget
         void editEvent();
         void deleteEvent();
         void addEvent();
+        void eventMoved(QTreeWidgetItem *, int, int);
 
         void addPhase();
 
@@ -118,7 +119,7 @@ class LTMSidebar : public QWidget
         QTreeWidgetItem *allCharts;
 
         GcSplitterItem *eventsWidget;
-        QTreeWidget *eventTree;
+        SeasonEventTreeView *eventTree;
         QTreeWidgetItem *allEvents;
 
         GcSplitterItem *filtersWidget;