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import gi
gi.require_version("Gdk", "4.0")
gi.require_version("Gtk", "4.0")
from gi.repository import Gdk, GObject, Gtk
class DragDropWindow(Gtk.ApplicationWindow):
def __init__(self, *args, **kargs):
super().__init__(*args, **kargs, title="Drag and Drop Example")
self.set_default_size(500, 400)
views_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
views_box.props.vexpand = True
self.set_child(views_box)
flow_box = Gtk.FlowBox()
views_box.append(flow_box)
flow_box.props.selection_mode = Gtk.SelectionMode.NONE
flow_box.append(SourceFlowBoxChild("Item 1", "image-missing"))
flow_box.append(SourceFlowBoxChild("Item 2", "help-about"))
flow_box.append(SourceFlowBoxChild("Item 3", "edit-copy"))
views_box.append(Gtk.Separator())
self.target_view = TargetView(vexpand=True)
views_box.append(self.target_view)
class SourceFlowBoxChild(Gtk.FlowBoxChild):
def __init__(self, name, icon_name):
super().__init__()
self.name = name
self.icon_name = icon_name
box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)
self.set_child(box)
icon = Gtk.Image(icon_name=self.icon_name)
label = Gtk.Label(label=self.name)
box.append(icon)
box.append(label)
drag_controller = Gtk.DragSource()
drag_controller.connect("prepare", self.on_drag_prepare)
drag_controller.connect("drag-begin", self.on_drag_begin)
self.add_controller(drag_controller)
def on_drag_prepare(self, _ctrl, _x, _y):
item = Gdk.ContentProvider.new_for_value(self)
string = Gdk.ContentProvider.new_for_value(self.name)
return Gdk.ContentProvider.new_union([item, string])
def on_drag_begin(self, ctrl, _drag):
icon = Gtk.WidgetPaintable.new(self)
ctrl.set_icon(icon, 0, 0)
class TargetView(Gtk.Box):
def __init__(self, **kargs):
super().__init__(**kargs)
self.stack = Gtk.Stack(hexpand=True)
self.append(self.stack)
empty_label = Gtk.Label(label="Drag some item, text, or files here.")
self.stack.add_named(empty_label, "empty")
self.stack.set_visible_child_name("empty")
box = Gtk.Box(
orientation=Gtk.Orientation.VERTICAL,
vexpand=True,
valign=Gtk.Align.CENTER,
)
self.stack.add_named(box, "item")
self.icon = Gtk.Image()
box.append(self.icon)
self.label = Gtk.Label()
box.append(self.label)
self.text = Gtk.Label()
self.stack.add_named(self.text, "other")
drop_controller = Gtk.DropTarget.new(
type=GObject.TYPE_NONE, actions=Gdk.DragAction.COPY
)
drop_controller.set_gtypes([SourceFlowBoxChild, Gdk.FileList, str])
drop_controller.connect("drop", self.on_drop)
self.add_controller(drop_controller)
def on_drop(self, _ctrl, value, _x, _y):
if isinstance(value, SourceFlowBoxChild):
self.label.props.label = value.name
self.icon.props.icon_name = value.icon_name
self.stack.set_visible_child_name("item")
elif isinstance(value, Gdk.FileList):
files = value.get_files()
names = ""
for file in files:
names += f"Loaded file {file.get_basename()}\n"
self.text.props.label = names
self.stack.set_visible_child_name("other")
elif isinstance(value, str):
self.text.props.label = value
self.stack.set_visible_child_name("other")
def on_activate(app):
win = DragDropWindow(application=app)
win.present()
app = Gtk.Application(application_id="com.example.App")
app.connect("activate", on_activate)
app.run(None)
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