Editor viewport global_canvas_transform auto reset when mouse hover on viewport

[yikescloud]

Godot version

3.4.2 stable[45eaa2d] steam version

System information

windows 10

Issue description

When use set_global_canvas_transform() on editor viewport, the editor viewport transform immediately

But when any input(keyboard pressed, or mouse hovered on canvas editor), it will be reset as before. And the transform only change the item on canvas but not the hints( grids, axis..etc)

Steps to reproduce

Add a tool script then call
get_tree().edited_scene_root.get_viewport().set_global_canvas_transform()

Minimal reproduction project

EditorCanvasTransform.zip

[yikescloud]

Finally I figure it out that you cannot change canvas item editor position by set the viewport's global_canvas_transform. I think the document should be point it out maybe.

Canvas Item Editor hierarchy

• Control
  • ViewportContainer
    • Viewport(edit_scene_root viewport)
  • CanvasItemEditorViewport
    • HScrollBar(CanvasItem Editor scrollbar)
    • VScrollBar(CanvasItem Editor scrollbar)
    • VBoxContainer
  • VBoxContainer

For anyone who wants change editor center by code:

func set_editor_centor(var _center: Vector2):#set editor 2d center
	var v = get_tree().edited_scene_root.get_viewport()
	var t = v.global_canvas_transform
	var s = t.get_scale()
	var _center_offset = (v.size/s.x)/2#canvas editor center offset
	_center = _center - _center_offset
	
	var p = v.get_parent().get_parent()
	for i in p.get_children():
		print(i.get_class())
		if i.get_class() == "CanvasItemEditorViewport":
			for j in i.get_children():
				if j.get_class() == "HScrollBar":
					j.set_value(_center.x)
				elif j.get_class() == "VScrollBar":
					j.set_value(_center.y)

[Calinou]

See also godotengine/godot-proposals#1302.

[KoBeWi]

Reopening. #68696 was merged and changing global_canvas_transform is supposedly the recommended way to access canvas transform (and modify it). However this issue still persists.

Not sure how it should be solved.

[KoBeWi]

In the meantime, here's a more robust solution for setting both zoom and position:

var editor = EditorInterface.get_base_control().find_child("@CanvasItemEditorViewport*", true, false)

var zoomer = editor.find_child("@EditorZoomWidget*", true, false)
zoomer.set_zoom(zoom)
zoomer.zoom_changed.emit(zoom)

var scroll = editor.find_child("@HScrollBar*", true, false)
scroll.value = pos.x
scroll = editor.find_child("@VScrollBar*", true, false)
scroll.value = pos.y