def move(self, pos):
"""
Move the item. x and y are in view coordinates.
"""
super(DropZoneInMotion, self).move(pos)
item = self.item
view = self.view
x, y = pos
current_parent = view.canvas.get_parent(item)
over_item = view.get_item_at_point((x, y), selected=False)
if not over_item:
view.dropzone_item = None
view.window.set_cursor(None)
return
if current_parent and not over_item: # are we going to remove from parent?
adapter = Group(current_parent, item)
if adapter:
view.window.set_cursor(OUT_CURSOR)
view.dropzone_item = current_parent
current_parent.request_update(matrix=False)
if over_item:
# are we going to add to parent?
adapter = Group(over_item, item)
if adapter and adapter.can_contain():
view.dropzone_item = over_item
view.window.set_cursor(IN_CURSOR)
over_item.request_update(matrix=False)
def on_motion_notify(self, event):
"""
Change parent item to dropzone state if it can accept diagram item
object to be created.
"""
view = self.view
if view.focused_item:
view.unselect_item(view.focused_item)
view.focused_item = None
try:
parent = view.get_item_at_point((event.x, event.y))
except KeyError:
parent = None
if parent:
# create dummy adapter
adapter = Group(parent, self._factory.item_class())
if adapter and adapter.can_contain():
view.dropzone_item = parent
cursor = Gdk.Cursor.new_for_display(
view.get_window().get_display(), IN_CURSOR_TYPE)
view.get_window().set_cursor(cursor)
self._parent = parent
else:
view.dropzone_item = None
view.get_window().set_cursor(None)
self._parent = None
parent.request_update(matrix=False)
else:
if view.dropzone_item:
view.dropzone_item.request_update(matrix=False)
view.dropzone_item = None
view.get_window().set_cursor(None)
def stop_move(self):
"""Motion stops: drop!"""
super().stop_move()
item = self.item
view = self.view
canvas = view.canvas
old_parent = view.canvas.get_parent(item)
new_parent = view.dropzone_item
try:
if new_parent is old_parent:
if old_parent is not None:
old_parent.request_update(matrix=False)
return
if old_parent:
canvas.reparent(item, None)
adapter = Group(old_parent, item)
if adapter:
adapter.ungroup()
old_parent.request_update()
if new_parent:
canvas.reparent(item, new_parent)
adapter = Group(new_parent, item)
if adapter and adapter.can_contain():
adapter.group()
new_parent.request_update()
finally:
view.dropzone_item = None
def on_motion_notify(self, event):
"""Change parent item to dropzone state if it can accept diagram item
object to be created."""
if self.grabbed_handle:
return self.handle_tool.on_motion_notify(event)
view = self.view
try:
parent = view.get_item_at_point((event.x, event.y))
except KeyError:
parent = None
if parent:
# create dummy adapter
adapter = Group(parent, self._factory.item_class())
if adapter and adapter.can_contain():
view.dropzone_item = parent
self._parent = parent
else:
view.dropzone_item = None
self._parent = None
parent.request_update(matrix=False)
else:
if view.dropzone_item:
view.dropzone_item.request_update(matrix=False)
view.dropzone_item = None
def move(self, pos):
"""Move the item.
x and y are in view coordinates.
"""
super().move(pos)
item = self.item
view = self.view
x, y = pos
current_parent = view.canvas.get_parent(item)
over_item = view.get_item_at_point((x, y), selected=False)
if not over_item:
view.dropzone_item = None
return
if current_parent and not over_item:
# are we going to remove from parent?
group = Group(current_parent, item)
if group:
view.dropzone_item = current_parent
current_parent.request_update(matrix=False)
if over_item:
# are we going to add to parent?
group = Group(over_item, item)
if group and group.can_contain():
view.dropzone_item = over_item
over_item.request_update(matrix=False)
def stop_move(self, pos):
"""Motion stops: drop!"""
super().stop_move(pos)
item = self.item
view = self.view
old_parent = item.parent
new_parent = view.selection.dropzone_item
try:
if new_parent is old_parent:
if old_parent is not None:
old_parent.request_update(matrix=False)
return
if old_parent:
item.parent = None
adapter = Group(old_parent, item)
if adapter:
adapter.ungroup()
old_parent.request_update()
if new_parent:
item.parent = new_parent
adapter = Group(new_parent, item)
if adapter and adapter.can_contain():
adapter.group()
new_parent.request_update()
finally:
view.selection.dropzone_item = None
def item_factory(diagram, parent=None):
if subject_class:
element_factory = diagram.model
subject = element_factory.create(subject_class)
else:
subject = None
item = diagram.create(item_class, subject=subject)
if config_func:
config_func(item)
adapter = Group(parent, item)
if parent and adapter.can_contain():
adapter.group()
diagram.canvas.reparent(item, parent=parent)
return item
def stop_move(self):
"""
Motion stops: drop!
"""
super(DropZoneInMotion, self).stop_move()
item = self.item
view = self.view
canvas = view.canvas
old_parent = view.canvas.get_parent(item)
new_parent = view.dropzone_item
try:
if new_parent is old_parent:
if old_parent is not None:
old_parent.request_update(matrix=False)
return
if old_parent:
adapter = Group(old_parent, item)
if adapter:
adapter.ungroup()
canvas.reparent(item, None)
m = canvas.get_matrix_i2c(old_parent)
item.matrix *= m
old_parent.request_update()
if new_parent:
adapter = Group(new_parent, item)
if adapter and adapter.can_contain():
adapter.group()
canvas.reparent(item, new_parent)
m = canvas.get_matrix_c2i(new_parent)
item.matrix *= m
new_parent.request_update()
finally:
view.dropzone_item = None
view.get_window().set_cursor(None)
def on_motion(controller, x, y, item_class):
view: GtkView = controller.get_widget()
model = view.model
try:
parent = item_at_point(view, (x, y))
except KeyError:
parent = None
if parent:
# create dummy adapter
connections = Connections()
adapter = Group(parent, item_class(connections))
if adapter and adapter.can_contain():
view.selection.dropzone_item = parent
else:
view.selection.dropzone_item = None
model.request_update(parent, matrix=False)
else:
if view.selection.dropzone_item:
model.request_update(view.selection.dropzone_item)
view.selection.dropzone_item = None
def move(self, pos):
"""
Move the item. x and y are in view coordinates.
"""
super().move(pos)
item = self.item
view = self.view
x, y = pos
current_parent = view.canvas.get_parent(item)
over_item = view.get_item_at_point((x, y), selected=False)
if not over_item:
view.dropzone_item = None
view.get_window().set_cursor(None)
return
if current_parent and not over_item:
# are we going to remove from parent?
group = Group(current_parent, item)
if group:
cursor = Gdk.Cursor.new_for_display(
view.get_window().get_display(), OUT_CURSOR_TYPE
)
view.get_window().set_cursor(cursor)
view.dropzone_item = current_parent
current_parent.request_update(matrix=False)
if over_item:
# are we going to add to parent?
group = Group(over_item, item)
if group and group.can_contain():
cursor = Gdk.Cursor.new_for_display(
view.get_window().get_display(), IN_CURSOR_TYPE
)
view.get_window().set_cursor(cursor)
view.dropzone_item = over_item
over_item.request_update(matrix=False)
def _create_item(self, pos):
"""
Create diagram item and place it within parent's boundaries.
"""
parent = self._parent
view = self.view
try:
adapter = Group(parent, self._factory.item_class())
if parent and adapter and adapter.can_contain():
item = super()._create_item(pos, parent=parent)
else:
item = super()._create_item(pos)
adapter = Group(parent, item)
if parent and item and adapter:
adapter.group()
parent.request_update(matrix=False)
finally:
self._parent = None
view.dropzone_item = None
view.get_window().set_cursor(None)
return item
def _create_item(self, pos, **kw):
"""
Create diagram item and place it within parent's boundaries.
"""
parent = self._parent
view = self.view
try:
adapter = Group(parent, self._factory.item_class())
if parent and adapter and adapter.can_contain():
kw["parent"] = parent
item = super(GroupPlacementTool, self)._create_item(pos, **kw)
adapter = Group(parent, item)
if parent and item and adapter:
adapter.group()
canvas = view.canvas
parent.request_update(matrix=False)
finally:
self._parent = None
view.dropzone_item = None
view.window.set_cursor(None)
return item
def can_group(self, parent, item):
"""
Check if an item can be grouped by parent.
"""
adapter = Group(parent, item)
return adapter.can_contain()
