From be7260ad246f033479b0a5e4a84bc94ac2dba604 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <wyskas@gmail.com>
Date: Sat, 12 Sep 2009 20:12:53 +0200
Subject: Lyrics: allow dragging of items.

though nowhere to drop them now
---
 nephilim/common.py          |  3 ++
 nephilim/plugins/Library.py | 72 ++++++++++++++++++++++++++++++++-------------
 2 files changed, 54 insertions(+), 21 deletions(-)

diff --git a/nephilim/common.py b/nephilim/common.py
index a04cc42..5bf562b 100644
--- a/nephilim/common.py
+++ b/nephilim/common.py
@@ -28,6 +28,9 @@ appIcon = ':icons/nephilim_small.png'
 APPNAME = 'nephilim'
 ORGNAME = 'nephilim'
 
+# custom mimetypes used for drag&drop
+MIMETYPES = {'songs' : 'application/x-mpd-songlist', 'plistsongs' : 'application/x-mpd-playlistsonglist'}
+
 def sec2min(secs):
     """Converts seconds to min:sec."""
     min=int(secs/60)
diff --git a/nephilim/plugins/Library.py b/nephilim/plugins/Library.py
index 89573e6..edc59d6 100644
--- a/nephilim/plugins/Library.py
+++ b/nephilim/plugins/Library.py
@@ -19,6 +19,7 @@ from PyQt4 import QtGui, QtCore
 from PyQt4.QtCore import QVariant
 
 from ..plugin import Plugin
+from ..common import MIMETYPES
 
 class Library(Plugin):
     # public, const
@@ -96,6 +97,7 @@ class LibraryWidget(QtGui.QWidget):
     filtered_items = None
     filter         = None
 
+
     class LibrarySongItem(QtGui.QStandardItem):
         # public
         "Song path"
@@ -128,6 +130,31 @@ class LibraryWidget(QtGui.QWidget):
 
             self.sort(0, QtCore.Qt.AscendingOrder)
 
+        def walk_tree(self, indices):
+            """Returns a generator over all songs that are children of indices."""
+            for index in indices:
+                if self.hasChildren(index):
+                    for song in self.walk_tree([self.index(i, 0, index) for i in range(self.rowCount(index))]):
+                        yield song
+                else:
+                    yield self.itemFromIndex(index).path
+
+        def flags(self, index):
+            return (QtCore.Qt.ItemIsDragEnabled if index.isValid() else 0) | QtGui.QStandardItemModel.flags(self, index)
+
+        def mimeTypes(self):
+            return MIMETYPES['songs']
+
+        def mimeData(self, indices):
+            data = SongsMimeData()
+
+            songs = []
+            for song in self.walk_tree(indices):
+                songs.append(song)
+
+            data.set_songs(songs)
+            return data
+
     class LibraryView(QtGui.QTreeView):
         def __init__(self):
             QtGui.QTreeView.__init__(self)
@@ -136,13 +163,7 @@ class LibraryWidget(QtGui.QWidget):
             self.setSelectionMode(QtGui.QAbstractItemView.ExtendedSelection)
             self.setUniformRowHeights(True)
             self.setHeaderHidden(True)
-
-        def selectedItems(self):
-            ret = []
-            for index in self.selectedIndexes():
-                ret.append(self.model().itemFromIndex(index))
-
-            return ret
+            self.setDragEnabled(True)
 
     def __init__(self, plugin):
         QtGui.QWidget.__init__(self)
@@ -166,7 +187,7 @@ class LibraryWidget(QtGui.QWidget):
 
         self.library_view  = self.LibraryView()
         self.library_view.setModel(self.library_model)
-        self.library_view.activated.connect(self.add_selection)
+        self.library_view.activated.connect(lambda : self.add_indices(self.library_view.selectedIndexes()))
 
         self.setLayout(QtGui.QVBoxLayout())
         self.layout().setSpacing(2)
@@ -228,23 +249,32 @@ class LibraryWidget(QtGui.QWidget):
         self.filtered_items = filtered_items
         self.filter         = text
 
+    @QtCore.pyqtSlot()
     def add_filtered(self):
-        self.add_items(self.filtered_items)
+        self.add_indices([self.library_model.indexFromItem(index) for index in self.filtered_items])
         self.search_txt.clear()
 
-    def add_selection(self):
-        self.add_items(self.library_view.selectedItems())
-
-    def add_items(self, items):
+    def add_indices(self, indices):
         paths = []
-        for item in items:
-            self.item_to_playlist(item, paths)
+        for song in self.library_model.walk_tree(indices):
+            paths.append(song)
         self.plugin.mpclient.add(paths)
 
-    def item_to_playlist(self, item, add_queue):
-        if isinstance(item, self.LibrarySongItem):
-            add_queue.append(item.path)
-        else:
-            for i in range(item.rowCount()):
-                self.item_to_playlist(item.child(i), add_queue)
+class SongsMimeData(QtCore.QMimeData):
+    # private
+    __songs = None
+
+    def set_songs(self, songs):
+        self.__songs = songs
+
+    def songs(self):
+        return self.__songs
+
+    def formats(self):
+        types = QtCore.QMimeData.formats(self)
+        return types if not self.__songs else types + [MIMETYPES['songs']]
 
+    def hasFormat(self, format):
+        if format == MIMETYPES['songs'] and self.__songs:
+            return True
+        return QtCore.QMimeData.hasFormat(self, format)
-- 
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