FeedReader: The feed can be moved with drag and drop to a folder

plugins/FeedReader/gui/FeedReaderDialog.cpp

@@ -84,9 +84,16 @@ FeedReaderDialog::FeedReaderDialog(RsFeedReader *feedReader, FeedReaderNotify *n
 	connect(ui->feedAddButton, SIGNAL(clicked()), this, SLOT(newFeed()));
 	connect(ui->feedProcessButton, SIGNAL(clicked()), this, SLOT(processFeed()));
 
+	connect(ui->feedTreeWidget, SIGNAL(feedReparent(QTreeWidgetItem*,QTreeWidgetItem*)), this, SLOT(feedTreeReparent(QTreeWidgetItem*,QTreeWidgetItem*)));
+
 	mFeedCompareRole = new RSTreeWidgetItemCompareRole;
 	mFeedCompareRole->setRole(COLUMN_FEED_NAME, ROLE_FEED_SORT);
 
+	/* enable drag and drop */
+	ui->feedTreeWidget->setAcceptDrops(true);
+	ui->feedTreeWidget->setDragEnabled(true);
+	ui->feedTreeWidget->setDragDropMode(QAbstractItemView::InternalMove);
+
 	/* initialize root item */
 	mRootItem = new QTreeWidgetItem(ui->feedTreeWidget);
 	QString name = tr("Message Folders");
@@ -395,6 +402,9 @@ void FeedReaderDialog::updateFeeds(uint32_t parentId, QTreeWidgetItem *parentIte
 					mOpenFeedIds->removeAt(index);
 				}
 			}
+		} else {
+			/* disable drop */
+			item->setFlags(item->flags() & ~Qt::ItemIsDropEnabled);
 		}
 	}
 
@@ -832,3 +842,30 @@ void FeedReaderDialog::processFeed()
 
 	mFeedReader->processFeed(feedId);
 }
+
+void FeedReaderDialog::feedTreeReparent(QTreeWidgetItem *item, QTreeWidgetItem *newParent)
+{
+	if (!item || ! newParent) {
+		return;
+	}
+
+	uint32_t feedId = item->data(COLUMN_FEED_DATA, ROLE_FEED_ID).toUInt();
+	uint32_t parentId = newParent->data(COLUMN_FEED_DATA, ROLE_FEED_ID).toUInt();
+
+	if (feedId == 0) {
+		return;
+	}
+
+	RsFeedAddResult result = mFeedReader->setParent(feedId, parentId);
+	if (FeedReaderStringDefs::showError(this, result, tr("Move feed"), tr("Cannot move feed."))) {
+		return;
+	}
+
+	bool expanded = item->isExpanded();
+	item->parent()->removeChild(item);
+	newParent->addChild(item);
+	item->setExpanded(expanded);
+	newParent->setExpanded(true);
+
+	calculateFeedItems();
+}

plugins/FeedReader/gui/FeedReaderDialog.h

@@ -61,6 +61,7 @@ private slots:
 	void editFeed();
 	void activateFeed();
 	void processFeed();
+	void feedTreeReparent(QTreeWidgetItem *item, QTreeWidgetItem *newParent);
 
 	void messageTabCloseRequested(int index);
 	void messageTabChanged(int index);

plugins/FeedReader/gui/FeedReaderDialog.ui

@@ -150,7 +150,7 @@
         </widget>
        </item>
        <item row="1" column="0">
-        <widget class="RSTreeWidget" name="feedTreeWidget">
+        <widget class="FeedTreeWidget" name="feedTreeWidget">
          <property name="contextMenuPolicy">
           <enum>Qt::CustomContextMenu</enum>
          </property>
@@ -186,9 +186,9 @@
  </widget>
  <customwidgets>
   <customwidget>
-   <class>RSTreeWidget</class>
+   <class>FeedTreeWidget</class>
    <extends>QTreeWidget</extends>
-   <header>gui/common/RSTreeWidget.h</header>
+   <header>gui/FeedTreeWidget.h</header>
   </customwidget>
   <customwidget>
    <class>RSTabWidget</class>

plugins/FeedReader/gui/FeedTreeWidget.cpp

@@ -0,0 +1,119 @@
+/*******************************************************************************
+ * plugins/FeedReader/gui/FeedTreeWidget.cpp                                   *
+ *                                                                             *
+ * Copyright (C) 2012 RetroShare Team <retroshare.project@gmail.com>           *
+ *                                                                             *
+ * This program is free software: you can redistribute it and/or modify        *
+ * it under the terms of the GNU Affero General Public License as              *
+ * published by the Free Software Foundation, either version 3 of the          *
+ * License, or (at your option) any later version.                             *
+ *                                                                             *
+ * This program is distributed in the hope that it will be useful,             *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of              *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                *
+ * GNU Affero General Public License for more details.                         *
+ *                                                                             *
+ * You should have received a copy of the GNU Affero General Public License    *
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.       *
+ *                                                                             *
+ *******************************************************************************/
+
+#include <QDropEvent>
+#include "FeedTreeWidget.h"
+
+FeedTreeWidget::FeedTreeWidget(QWidget *parent) : RSTreeWidget(parent)
+{
+	mDraggedItem = NULL;
+}
+
+void FeedTreeWidget::dragEnterEvent(QDragEnterEvent *event)
+{
+	mDraggedItem = currentItem();
+	RSTreeWidget::dragEnterEvent(event);
+}
+
+void FeedTreeWidget::dragLeaveEvent(QDragLeaveEvent *event)
+{
+	RSTreeWidget::dragLeaveEvent(event);
+	mDraggedItem = NULL;
+}
+
+bool FeedTreeWidget::canDrop(QDropEvent *event, QTreeWidgetItem **dropItem)
+{
+	if (dropItem) {
+		*dropItem = NULL;
+	}
+
+	if (!mDraggedItem) {
+		/* no drag item */
+		return false;
+	}
+
+	QModelIndex droppedIndex = indexAt(event->pos());
+	if (!droppedIndex.isValid()) {
+		/* no drop target */
+		return false;
+	}
+
+	QTreeWidgetItem *dropItemIntern = itemFromIndex(droppedIndex);
+	if (!dropItemIntern) {
+		/* no drop item */
+		return false;
+	}
+
+	if ((dropItemIntern->flags() & Qt::ItemIsDropEnabled) == 0) {
+		/* drop is disabled */
+		return false;
+	}
+
+	if (dropItemIntern == mDraggedItem->parent()) {
+		/* drag item parent */
+		return false;
+	}
+
+	if (dropItem) {
+		*dropItem = dropItemIntern;
+	}
+
+	return true;
+}
+
+void FeedTreeWidget::dragMoveEvent(QDragMoveEvent *event)
+{
+	if (!canDrop(event)) {
+		event->ignore();
+		return;
+	}
+
+	RSTreeWidget::dragMoveEvent(event);
+}
+
+void FeedTreeWidget::dropEvent(QDropEvent *event)
+{
+	QTreeWidgetItem *dropItem;
+	if (!canDrop(event, &dropItem)) {
+		event->ignore();
+		return;
+	}
+
+	if (!mDraggedItem) {
+		/* no drag item */
+		event->ignore();
+		return;
+	}
+
+	QTreeWidgetItem *draggedParent = mDraggedItem->parent();
+	if (!draggedParent) {
+		/* no drag item parent */
+		event->ignore();
+		return;
+	}
+
+	if (!dropItem) {
+		/* no drop item */
+		event->ignore();
+		return;
+	}
+
+	emit feedReparent(mDraggedItem, dropItem);
+}

plugins/FeedReader/gui/FeedTreeWidget.h

@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * plugins/FeedReader/gui/FeedTreeWidget.h                                     *
+ *                                                                             *
+ * Copyright (C) 2012 by Retroshare Team <retroshare.project@gmail.com>        *
+ *                                                                             *
+ * This program is free software: you can redistribute it and/or modify        *
+ * it under the terms of the GNU Affero General Public License as              *
+ * published by the Free Software Foundation, either version 3 of the          *
+ * License, or (at your option) any later version.                             *
+ *                                                                             *
+ * This program is distributed in the hope that it will be useful,             *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of              *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                *
+ * GNU Affero General Public License for more details.                         *
+ *                                                                             *
+ * You should have received a copy of the GNU Affero General Public License    *
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.       *
+ *                                                                             *
+ *******************************************************************************/
+
+#ifndef _FEEDTREEWIDGET_H
+#define _FEEDTREEWIDGET_H
+
+#include "gui/common/RSTreeWidget.h"
+
+/* Subclassing RSTreeWidget */
+class FeedTreeWidget : public RSTreeWidget
+{
+	Q_OBJECT
+
+public:
+	FeedTreeWidget(QWidget *parent = 0);
+
+Q_SIGNALS:
+	void feedReparent(QTreeWidgetItem *item, QTreeWidgetItem *newParent);
+
+protected:
+	void dragEnterEvent(QDragEnterEvent *event);
+	void dragLeaveEvent(QDragLeaveEvent *event);
+	void dragMoveEvent(QDragMoveEvent *event);
+	void dropEvent(QDropEvent *event);
+
+private:
+	bool canDrop(QDropEvent *event, QTreeWidgetItem **dropItem = NULL);
+
+private:
+	QTreeWidgetItem *mDraggedItem;
+};
+
+#endif