有向非巡回グラフを扱うライブラリliblarchを PyGTK (GTK2) から PyGObject introspection (GTK3) に移植しています。GtkTreeView で問題が発生しました。
liblarch を使用するアプリは、GtkTreeView を列で並べ替える必要がありますが、同時に、ユーザーは行をドラッグ アンド ドロップし、行を別の行の下に移動できます。そのためには手動で処理する必要がありましたがdnd_data_get()、dnd_data_receive()これはまったく問題ありません。
PyGTK で動作する GtkTreeView の最小限のセットアップがあります。行はソートされ、ユーザーは行を移動できます。
#!/usr/bin/python
# -*- coding: utf-8 -*-
import gtk
window = gtk.Window()
window.set_size_request(300, 200)
window.connect('delete_event', lambda w,e: gtk.main_quit())
# Define Liblarch Tree
store = gtk.TreeStore(str, str)
store.insert(None, -1, ["A", "Task A"])
store.insert(None, -1, ["B", "Task B"])
store.insert(None, -1, ["C", "Task C"])
d_parent = store.insert(None, -1, ["D", "Task D"])
store.insert(d_parent, -1, ["E", "Task E"])
# Define TreeView in similar way as it happens in GTG/Liblarch_gtk
tv = gtk.TreeView()
col = gtk.TreeViewColumn()
col.set_title("Title")
render_text = gtk.CellRendererText()
col.pack_start(render_text, expand=True)
col.add_attribute(render_text, 'markup', 1)
col.set_resizable(True)
col.set_expand(True)
col.set_sort_column_id(0)
tv.append_column(col)
tv.set_property("expander-column", col)
treemodel = store
def _sort_func(model, iter1, iter2):
""" Sort two iterators by function which gets node objects.
This is a simple wrapper which prepares node objects and then
call comparing function. In other case return default value -1
"""
node_a = model.get_value(iter1, 0)
node_b = model.get_value(iter2, 0)
if node_a and node_b:
sort = cmp(node_a, node_b)
else:
sort = -1
return sort
treemodel.set_sort_func(1, _sort_func)
tv.set_model(treemodel)
def on_child_toggled(treemodel2, path, iter, param=None):
""" Expand row """
if not tv.row_expanded(path):
tv.expand_row(path, True)
treemodel.connect('row-has-child-toggled', on_child_toggled)
tv.set_search_column(1)
tv.set_property("enable-tree-lines", False)
tv.set_rules_hint(False)
#### Drag and drop stuff
dnd_internal_target = ''
dnd_external_targets = {}
def on_drag_fail(widget, dc, result):
print "Failed dragging", widget, dc, result
def __init_dnd():
""" Initialize Drag'n'Drop support
Firstly build list of DND targets:
* name
* scope - just the same widget / same application
* id
Enable DND by calling enable_model_drag_dest(),
enable_model-drag_source()
It didnt use support from gtk.Widget(drag_source_set(),
drag_dest_set()). To know difference, look in PyGTK FAQ:
http://faq.pygtk.org/index.py?file=faq13.033.htp&req=show
"""
#defer_select = False
if dnd_internal_target == '':
error = 'Cannot initialize DND without a valid name\n'
error += 'Use set_dnd_name() first'
raise Exception(error)
dnd_targets = [(dnd_internal_target, gtk.TARGET_SAME_WIDGET, 0)]
for target in dnd_external_targets:
name = dnd_external_targets[target][0]
dnd_targets.append((name, gtk.TARGET_SAME_APP, target))
tv.enable_model_drag_source( gtk.gdk.BUTTON1_MASK,
dnd_targets, gtk.gdk.ACTION_DEFAULT | gtk.gdk.ACTION_MOVE)
tv.enable_model_drag_dest(\
dnd_targets, gtk.gdk.ACTION_DEFAULT | gtk.gdk.ACTION_MOVE)
def on_drag_data_get(treeview, context, selection, info, timestamp):
""" Extract data from the source of the DnD operation.
Serialize iterators of selected tasks in format
<iter>,<iter>,...,<iter> and set it as parameter of DND """
print "on_drag_data_get(", treeview, context, selection, info, timestamp
treeselection = treeview.get_selection()
model, paths = treeselection.get_selected_rows()
iters = [model.get_iter(path) for path in paths]
iter_str = ','.join([model.get_string_from_iter(iter) for iter in iters])
selection.set(dnd_internal_target, 0, iter_str)
print "Sending", iter_str
def on_drag_data_received(treeview, context, x, y, selection, info,\
timestamp):
""" Handle a drop situation.
First of all, we need to get id of node which should accept
all draged nodes as their new children. If there is no node,
drop to root node.
Deserialize iterators of dragged nodes (see self.on_drag_data_get())
Info parameter determines which target was used:
* info == 0 => internal DND within this TreeView
* info > 0 => external DND
In case of internal DND we just use Tree.move_node().
In case of external DND we call function associated with that DND
set by self.set_dnd_external()
"""
print "on_drag_data_received", treeview, context, x, y, selection, info, timestamp
model = treeview.get_model()
destination_iter = None
destination_tid = None
drop_info = treeview.get_dest_row_at_pos(x, y)
if drop_info:
path, position = drop_info
destination_iter = model.get_iter(path)
if destination_iter:
destination_tid = model.get_value(destination_iter, 0)
# Get dragged iter as a TaskTreeModel iter
# If there is no selected task (empty selection.data),
# explictly skip handling it (set to empty list)
if selection.data == '':
iters = []
else:
iters = selection.data.split(',')
dragged_iters = []
for iter in iters:
print "Info", info
if info == 0:
try:
dragged_iters.append(model.get_iter_from_string(iter))
except ValueError:
#I hate to silently fail but we have no choice.
#It means that the iter is not good.
#Thanks shitty gtk API for not allowing us to test the string
print "Shitty iter", iter
dragged_iter = None
elif info in dnd_external_targets and destination_tid:
f = dnd_external_targets[info][1]
src_model = context.get_source_widget().get_model()
dragged_iters.append(src_model.get_iter_from_string(iter))
for dragged_iter in dragged_iters:
if info == 0:
if dragged_iter and model.iter_is_valid(dragged_iter):
dragged_tid = model.get_value(dragged_iter, 0)
try:
row = []
for i in range(model.get_n_columns()):
row.append(model.get_value(dragged_iter, i))
#tree.move_node(dragged_tid, new_parent_id=destination_tid)
print "move_after(%s, %s) ~ (%s, %s)" % (dragged_iter, destination_iter, dragged_tid, destination_tid)
#model.move_after(dragged_iter, destination_iter)
model.insert(destination_iter, -1, row)
model.remove(dragged_iter)
except Exception, e:
print 'Problem with dragging: %s' % e
elif info in dnd_external_targets and destination_tid:
source = src_model.get_value(dragged_iter,0)
# Handle external Drag'n'Drop
f(source, destination_tid)
dnd_internal_target = 'gtg/task-iter-str'
__init_dnd()
tv.connect('drag_data_get', on_drag_data_get)
tv.connect('drag_data_received', on_drag_data_received)
tv.connect('drag_failed', on_drag_fail)
window.add(tv)
window.show_all()
tv.expand_all()
gtk.main()
# vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
このスクリプトを PyGObject (GTK3) に移植しました。私のコード:
#!/usr/bin/python
# -*- coding: utf-8 -*-
from gi.repository import Gtk, Gdk
window = Gtk.Window()
window.set_size_request(300, 200)
window.connect('delete_event', lambda w,e: Gtk.main_quit())
# Define Liblarch Tree
store = Gtk.TreeStore(str, str)
store.insert(None, -1, ["A", "Task A"])
store.insert(None, -1, ["B", "Task B"])
store.insert(None, -1, ["C", "Task C"])
d_parent = store.insert(None, -1, ["D", "Task D"])
store.insert(d_parent, -1, ["E", "Task E"])
# Define TreeView in similar way as it happens in GTG/Liblarch_gtk
tv = Gtk.TreeView()
col = Gtk.TreeViewColumn()
col.set_title("Title")
render_text = Gtk.CellRendererText()
col.pack_start(render_text, expand=True)
col.add_attribute(render_text, 'markup', 1)
col.set_resizable(True)
col.set_expand(True)
col.set_sort_column_id(0)
tv.append_column(col)
tv.set_property("expander-column", col)
treemodel = store
def _sort_func(model, iter1, iter2):
""" Sort two iterators by function which gets node objects.
This is a simple wrapper which prepares node objects and then
call comparing function. In other case return default value -1
"""
node_a = model.get_value(iter1, 0)
node_b = model.get_value(iter2, 0)
if node_a and node_b:
sort = cmp(node_a, node_b)
else:
sort = -1
return sort
treemodel.set_sort_func(1, _sort_func)
tv.set_model(treemodel)
def on_child_toggled(treemodel2, path, iter, param=None):
""" Expand row """
if not tv.row_expanded(path):
tv.expand_row(path, True)
treemodel.connect('row-has-child-toggled', on_child_toggled)
tv.set_search_column(1)
tv.set_property("enable-tree-lines", False)
tv.set_rules_hint(False)
#### Drag and drop stuff
dnd_internal_target = ''
dnd_external_targets = {}
def on_drag_fail(widget, dc, result):
print "Failed dragging", widget, dc, result
def __init_dnd():
""" Initialize Drag'n'Drop support
Firstly build list of DND targets:
* name
* scope - just the same widget / same application
* id
Enable DND by calling enable_model_drag_dest(),
enable_model-drag_source()
It didnt use support from Gtk.Widget(drag_source_set(),
drag_dest_set()). To know difference, look in PyGTK FAQ:
http://faq.pygtk.org/index.py?file=faq13.033.htp&req=show
"""
#defer_select = False
if dnd_internal_target == '':
error = 'Cannot initialize DND without a valid name\n'
error += 'Use set_dnd_name() first'
raise Exception(error)
dnd_targets = [(dnd_internal_target, Gtk.TargetFlags.SAME_WIDGET, 0)]
for target in dnd_external_targets:
name = dnd_external_targets[target][0]
dnd_targets.append((name, Gtk.TARGET_SAME_APP, target))
tv.enable_model_drag_source( Gdk.ModifierType.BUTTON1_MASK,
dnd_targets, Gdk.DragAction.DEFAULT | Gdk.DragAction.MOVE)
tv.enable_model_drag_dest(\
dnd_targets, Gdk.DragAction.DEFAULT | Gdk.DragAction.MOVE)
def on_drag_data_get(treeview, context, selection, info, timestamp):
""" Extract data from the source of the DnD operation.
Serialize iterators of selected tasks in format
<iter>,<iter>,...,<iter> and set it as parameter of DND """
print "on_drag_data_get(", treeview, context, selection, info, timestamp
treeselection = treeview.get_selection()
model, paths = treeselection.get_selected_rows()
iters = [model.get_iter(path) for path in paths]
iter_str = ','.join([model.get_string_from_iter(iter) for iter in iters])
selection.set(dnd_internal_target, 0, iter_str)
print "Sending", iter_str
def on_drag_data_received(treeview, context, x, y, selection, info,\
timestamp):
""" Handle a drop situation.
First of all, we need to get id of node which should accept
all draged nodes as their new children. If there is no node,
drop to root node.
Deserialize iterators of dragged nodes (see self.on_drag_data_get())
Info parameter determines which target was used:
* info == 0 => internal DND within this TreeView
* info > 0 => external DND
In case of internal DND we just use Tree.move_node().
In case of external DND we call function associated with that DND
set by self.set_dnd_external()
"""
print "on_drag_data_received", treeview, context, x, y, selection, info, timestamp
model = treeview.get_model()
destination_iter = None
destination_tid = None
drop_info = treeview.get_dest_row_at_pos(x, y)
if drop_info:
path, position = drop_info
destination_iter = model.get_iter(path)
if destination_iter:
destination_tid = model.get_value(destination_iter, 0)
# Get dragged iter as a TaskTreeModel iter
# If there is no selected task (empty selection.data),
# explictly skip handling it (set to empty list)
if selection.data == '':
iters = []
else:
iters = selection.data.split(',')
dragged_iters = []
for iter in iters:
print "Info", info
if info == 0:
try:
dragged_iters.append(model.get_iter_from_string(iter))
except ValueError:
#I hate to silently fail but we have no choice.
#It means that the iter is not good.
#Thanks shitty Gtk API for not allowing us to test the string
print "Shitty iter", iter
dragged_iter = None
elif info in dnd_external_targets and destination_tid:
f = dnd_external_targets[info][1]
src_model = context.get_source_widget().get_model()
dragged_iters.append(src_model.get_iter_from_string(iter))
for dragged_iter in dragged_iters:
if info == 0:
if dragged_iter and model.iter_is_valid(dragged_iter):
dragged_tid = model.get_value(dragged_iter, 0)
try:
row = []
for i in range(model.get_n_columns()):
row.append(model.get_value(dragged_iter, i))
#tree.move_node(dragged_tid, new_parent_id=destination_tid)
print "move_after(%s, %s) ~ (%s, %s)" % (dragged_iter, destination_iter, dragged_tid, destination_tid)
#model.move_after(dragged_iter, destination_iter)
model.insert(destination_iter, -1, row)
model.remove(dragged_iter)
except Exception, e:
print 'Problem with dragging: %s' % e
elif info in dnd_external_targets and destination_tid:
source = src_model.get_value(dragged_iter,0)
# Handle external Drag'n'Drop
f(source, destination_tid)
dnd_internal_target = 'gtg/task-iter-str'
__init_dnd()
tv.connect('drag_data_get', on_drag_data_get)
tv.connect('drag_data_received', on_drag_data_received)
tv.connect('drag_failed', on_drag_fail)
window.add(tv)
window.show_all()
tv.expand_all()
Gtk.main()
# vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
dnd_data_receive()呼び出されていないか、データが受信されていない場合、正しく処理できません。次のコールバック + そのパラメーターで常に失敗します。
Failed dragging <TreeView object at 0xeb4370 (GtkTreeView at 0xf742a0)> <gtk.gdk.X11DragContext object at 0xf351e0 (GdkX11DragContext at 0xf96ca0)> <enum GTK_DRAG_RESULT_NO_TARGET of type GtkDragResult>
私の質問:最初のスクリプトを PyGObject (GTK3) に移植して、GtkTreeView をソートし、同時に行をドラッグ アンド ドロップできるようにする方法を教えてください。ドラッグ アンド ドロップ コールバックの処理を変更して、ドラッグ アンド ドロップを正しく処理するにはどうすればよいですか?