updated examples for how to drag an undecorated viewport

window/drag_menu_bar.py

@@ -1,5 +1,6 @@
 # Inspired by https://github.com/bandit-masked/raccoon/blob/main/src/gui/gui.py#L231
 # and credit to @Atlamillias on Discord.
+# see also drag_undecorated_viewport.py
 import dearpygui.dearpygui as dpg
 dpg.create_context()
 

window/drag_undecorated_viewport.py

@@ -0,0 +1,41 @@
+# Credit @v-ein - see https://discord.com/channels/736279277242417272/1191409079025930340/1191409079025930340
+# see also drag_menu_bar.py
+import dearpygui.dearpygui as dpg
+
+dpg.create_context()
+
+def drag_viewport(sender, app_data):
+    FRAME_PADDING_Y = 3
+    _, drag_dx, drag_dy = app_data
+
+    # Note: at this point, the mouse has already moved off the starting point,
+    # but to do a hit-test on the title bar, we need the starting point so we go
+    # back to it.
+    drag_start_y = dpg.get_mouse_pos(local=False)[1] - drag_dy
+    title_bar_height = 2*FRAME_PADDING_Y + dpg.get_text_size("")[1]
+    if drag_start_y < title_bar_height:  # only drag the viewport when dragging the title bar
+        x_pos, y_pos = dpg.get_viewport_pos()
+
+        # We're limiting the y position so that the viewport doesn't go off the top of the screen
+        dpg.set_viewport_pos((x_pos + drag_dx, max(0, y_pos + drag_dy)))
+
+with dpg.handler_registry():
+    dpg.add_mouse_drag_handler(button=0, threshold=0.0, callback=drag_viewport)
+
+window_title = "Test title bar"
+
+with dpg.window(label=window_title, on_close=lambda: dpg.stop_dearpygui()) as wnd:
+    dpg.add_text("Window contents goes here")
+
+# Need the same title here as the title on dpg.window (otherwise the task bar
+# will show a different... this can be used as a feature - to control the task bar
+# separately :)).
+dpg.create_viewport(title=window_title, width=400, height=300)
+dpg.set_primary_window(wnd, True)
+dpg.configure_item(wnd, no_title_bar=False)
+dpg.set_viewport_decorated(False)
+
+dpg.setup_dearpygui()
+dpg.show_viewport()
+dpg.start_dearpygui()
+dpg.destroy_context()