Como arrastar e soltar e ordenar o GtkTreeView no GTK3?
Eu estou portandoliblarch, uma biblioteca para lidar com gráficos acíclicos direcionados, do PyGTK (GTK2) à introspecção do PyGObject (GTK3). Eu corri para o problema com o GtkTreeView.
O aplicativo que usa o liblarch precisa classificar o GtkTreeView por uma coluna, mas, ao mesmo tempo, o usuário pode arrastar e soltar linhas, mover uma linha para outra linha. Para isso eu tive que processar manualmentednd_data_get() ednd_data_receive() que está perfeitamente bem.
Existe a configuração mínima para o GtkTreeView que funciona no PyGTK. As linhas são classificadas e o usuário pode mover as linhas ao redor.
#!/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
Eu portei este script para o PyGObject (GTK3). Meu código:
#!/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
Eu não sou capaz de lidardnd_data_receive() corretamente onde não é evocado ou nenhum dado é recebido. Ele sempre falha com o seguinte retorno de chamada + seus parâmetros:
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>
Minha pergunta:Como portar o primeiro script para o PyGObject (GTK3) para que o GtkTreeView possa ser classificado e no mesmo tempo as linhas possam ser arrastadas e soltas? Como alterar o tratamento de chamadas de retorno de arrastar e soltar para processar corretamente arrastar e soltar?