我正在将用于处理有向无环图的库liblarch从 PyGTK (GTK2) 移植到 PyGObject 内省 (GTK3)。我遇到了 GtkTreeView 的问题。
使用 liblarch 的应用程序需要按列对 GtkTreeView 进行排序，但同时，用户可以拖放行，将一行移动到另一行下。为此，我必须手动处理dnd_data_get()，dnd_data_receive()这完全可以。
在 PyGTK 下工作的 GtkTreeView 有最小的设置。行已排序，用户可以移动行。
#!/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
我将此脚本移植到 PyGObject (GTK3) 中。我的代码：
#!/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
我无法dnd_data_receive()正确处理未引发或未收到数据的情况。它总是因以下回调+其参数而失败：
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>
我的问题：如何将第一个脚本移植到 PyGObject (GTK3) 以便可以对 GtkTreeView 进行排序并同时拖放行？如何更改处理拖放回调以正确处理拖放？