From 186976e2095f3cc13f1a4fe09fcae69facb43974 Mon Sep 17 00:00:00 2001
From: thunder2 <thunder2@users.sourceforge.net>
Date: Thu, 13 Apr 2023 15:53:14 +0200
Subject: [PATCH] FeedReader: The feed can be moved with drag and drop to a
 folder

---
 plugins/FeedReader/FeedReader.pro           |   2 +
 plugins/FeedReader/gui/FeedReaderDialog.cpp |  37 ++++++
 plugins/FeedReader/gui/FeedReaderDialog.h   |   1 +
 plugins/FeedReader/gui/FeedReaderDialog.ui  |   6 +-
 plugins/FeedReader/gui/FeedTreeWidget.cpp   | 119 ++++++++++++++++++++
 plugins/FeedReader/gui/FeedTreeWidget.h     |  50 ++++++++
 plugins/FeedReader/interface/rsFeedReader.h |   1 +
 plugins/FeedReader/lang/FeedReader_en.ts    |  20 +++-
 plugins/FeedReader/services/p3FeedReader.cc |  56 +++++++++
 plugins/FeedReader/services/p3FeedReader.h  |   1 +
 10 files changed, 285 insertions(+), 8 deletions(-)
 create mode 100644 plugins/FeedReader/gui/FeedTreeWidget.cpp
 create mode 100644 plugins/FeedReader/gui/FeedTreeWidget.h

diff --git a/plugins/FeedReader/FeedReader.pro b/plugins/FeedReader/FeedReader.pro
index b5dbbf43a..5c696b5c3 100644
--- a/plugins/FeedReader/FeedReader.pro
+++ b/plugins/FeedReader/FeedReader.pro
@@ -44,6 +44,7 @@ SOURCES =	FeedReaderPlugin.cpp \
 			gui/FeedReaderFeedNotify.cpp \
 			gui/FeedReaderUserNotify.cpp \
 			gui/FeedReaderFeedItem.cpp \
+			gui/FeedTreeWidget.cpp \
 			util/CURLWrapper.cpp \
 			util/XMLWrapper.cpp \
 			util/HTMLWrapper.cpp \
@@ -64,6 +65,7 @@ HEADERS =	FeedReaderPlugin.h \
 			gui/FeedReaderFeedNotify.h \
 			gui/FeedReaderUserNotify.h \
 			gui/FeedReaderFeedItem.h \
+			gui/FeedTreeWidget.h \
 			util/CURLWrapper.h \
 			util/XMLWrapper.h \
 			util/HTMLWrapper.h \
diff --git a/plugins/FeedReader/gui/FeedReaderDialog.cpp b/plugins/FeedReader/gui/FeedReaderDialog.cpp
index abc2f1aa5..4c409a38c 100644
--- a/plugins/FeedReader/gui/FeedReaderDialog.cpp
+++ b/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();
+}
diff --git a/plugins/FeedReader/gui/FeedReaderDialog.h b/plugins/FeedReader/gui/FeedReaderDialog.h
index a221cfe64..d684f1f4b 100644
--- a/plugins/FeedReader/gui/FeedReaderDialog.h
+++ b/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);
diff --git a/plugins/FeedReader/gui/FeedReaderDialog.ui b/plugins/FeedReader/gui/FeedReaderDialog.ui
index 5eed95bc7..b6b004d69 100644
--- a/plugins/FeedReader/gui/FeedReaderDialog.ui
+++ b/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>
diff --git a/plugins/FeedReader/gui/FeedTreeWidget.cpp b/plugins/FeedReader/gui/FeedTreeWidget.cpp
new file mode 100644
index 000000000..37baaf235
--- /dev/null
+++ b/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);
+}
diff --git a/plugins/FeedReader/gui/FeedTreeWidget.h b/plugins/FeedReader/gui/FeedTreeWidget.h
new file mode 100644
index 000000000..e9eb197a9
--- /dev/null
+++ b/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
diff --git a/plugins/FeedReader/interface/rsFeedReader.h b/plugins/FeedReader/interface/rsFeedReader.h
index 7158d29ee..6ff39cdc9 100644
--- a/plugins/FeedReader/interface/rsFeedReader.h
+++ b/plugins/FeedReader/interface/rsFeedReader.h
@@ -216,6 +216,7 @@ public:
 	virtual RsFeedAddResult setFolder(uint32_t feedId, const std::string &name) = 0;
 	virtual RsFeedAddResult addFeed(const FeedInfo &feedInfo, uint32_t &feedId) = 0;
 	virtual RsFeedAddResult setFeed(uint32_t feedId, const FeedInfo &feedInfo) = 0;
+	virtual RsFeedAddResult setParent(uint32_t feedId, uint32_t parentId) = 0;
 	virtual bool            removeFeed(uint32_t feedId) = 0;
 	virtual bool            addPreviewFeed(const FeedInfo &feedInfo, uint32_t &feedId) = 0;
 	virtual void            getFeedList(uint32_t parentId, std::list<FeedInfo> &feedInfos) = 0;
diff --git a/plugins/FeedReader/lang/FeedReader_en.ts b/plugins/FeedReader/lang/FeedReader_en.ts
index f366ccc9c..500c46810 100644
--- a/plugins/FeedReader/lang/FeedReader_en.ts
+++ b/plugins/FeedReader/lang/FeedReader_en.ts
@@ -194,7 +194,7 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="+186"/>
+        <location line="+192"/>
         <location line="+148"/>
         <location line="+15"/>
         <source>Edit feed</source>
@@ -312,7 +312,7 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../gui/FeedReaderDialog.cpp" line="+92"/>
+        <location filename="../gui/FeedReaderDialog.cpp" line="+99"/>
         <source>Message Folders</source>
         <translation type="unfinished"></translation>
     </message>
@@ -362,7 +362,7 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="+195"/>
+        <location line="+198"/>
         <source>No name</source>
         <translation type="unfinished"></translation>
     </message>
@@ -418,6 +418,16 @@
         <source>Please enter a new name for the folder</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <location line="+61"/>
+        <source>Move feed</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <location line="+0"/>
+        <source>Cannot move feed.</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>FeedReaderFeedItem</name>
@@ -520,7 +530,7 @@
     </message>
     <message>
         <location line="+26"/>
-        <location filename="../gui/FeedReaderMessageWidget.cpp" line="+113"/>
+        <location filename="../gui/FeedReaderMessageWidget.cpp" line="+115"/>
         <source>Title</source>
         <translation type="unfinished"></translation>
     </message>
@@ -612,7 +622,7 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location line="+374"/>
+        <location line="+385"/>
         <source>Hide</source>
         <translation type="unfinished"></translation>
     </message>
diff --git a/plugins/FeedReader/services/p3FeedReader.cc b/plugins/FeedReader/services/p3FeedReader.cc
index 4c2eacaaf..5d861710b 100644
--- a/plugins/FeedReader/services/p3FeedReader.cc
+++ b/plugins/FeedReader/services/p3FeedReader.cc
@@ -598,6 +598,62 @@ RsFeedAddResult p3FeedReader::setFeed(uint32_t feedId, const FeedInfo &feedInfo)
 	return RS_FEED_ADD_RESULT_SUCCESS;
 }
 
+RsFeedAddResult p3FeedReader::setParent(uint32_t feedId, uint32_t parentId)
+{
+	bool changed = false;
+
+	{
+		RsStackMutex stack(mFeedReaderMtx); /******* LOCK STACK MUTEX *********/
+
+#ifdef FEEDREADER_DEBUG
+		std::cerr << "p3FeedReader::setParent - set parent " << parentId << std::endl;
+#endif
+
+		std::map<uint32_t, RsFeedReaderFeed*>::iterator feedIt = mFeeds.find(feedId);
+		if (feedIt == mFeeds.end()) {
+#ifdef FEEDREADER_DEBUG
+			std::cerr << "p3FeedReader::setParent - feed id " << feedId << " not found" << std::endl;
+#endif
+			return RS_FEED_ADD_RESULT_FEED_NOT_FOUND;
+		}
+
+		if (parentId) {
+			/* check parent id */
+			std::map<uint32_t, RsFeedReaderFeed*>::iterator parentIt = mFeeds.find(parentId);
+			if (parentIt == mFeeds.end()) {
+#ifdef FEEDREADER_DEBUG
+				std::cerr << "p3FeedReader::setParent - parent id " << parentId << " not found" << std::endl;
+#endif
+				return RS_FEED_ADD_RESULT_PARENT_NOT_FOUND;
+			}
+
+			if ((parentIt->second->flag & RS_FEED_FLAG_FOLDER) == 0) {
+#ifdef FEEDREADER_DEBUG
+				std::cerr << "p3FeedReader::setParent - parent " << parentIt->second->name << " is no folder" << std::endl;
+#endif
+				return RS_FEED_ADD_RESULT_PARENT_IS_NO_FOLDER;
+			}
+		}
+
+		RsFeedReaderFeed *fi = feedIt->second;
+
+		if (fi->parentId != parentId) {
+			fi->parentId = parentId;
+			changed = true;
+		}
+	}
+
+	if (changed) {
+		IndicateConfigChanged();
+
+		if (mNotify) {
+			mNotify->notifyFeedChanged(feedId, NOTIFY_TYPE_MOD);
+		}
+	}
+
+	return RS_FEED_ADD_RESULT_SUCCESS;
+}
+
 void p3FeedReader::deleteAllMsgs_locked(RsFeedReaderFeed *fi)
 {
 	if (!fi) {
diff --git a/plugins/FeedReader/services/p3FeedReader.h b/plugins/FeedReader/services/p3FeedReader.h
index d60b63ca2..d98259a3b 100644
--- a/plugins/FeedReader/services/p3FeedReader.h
+++ b/plugins/FeedReader/services/p3FeedReader.h
@@ -59,6 +59,7 @@ public:
 	virtual RsFeedAddResult setFolder(uint32_t feedId, const std::string &name);
 	virtual RsFeedAddResult addFeed(const FeedInfo &feedInfo, uint32_t &feedId);
 	virtual RsFeedAddResult setFeed(uint32_t feedId, const FeedInfo &feedInfo);
+	virtual RsFeedAddResult setParent(uint32_t feedId, uint32_t parentId);
 	virtual bool            removeFeed(uint32_t feedId);
 	virtual bool            addPreviewFeed(const FeedInfo &feedInfo, uint32_t &feedId);
 	virtual void            getFeedList(uint32_t parentId, std::list<FeedInfo> &feedInfos);