Added a clipboard pattern button

It starts empty and gets updated every time the user copies something.

src/Tools/Bucket.gd

@@ -37,11 +37,11 @@ func _on_FillWithOptions_item_selected(index: int) -> void:
 	save_config()
 
 
-func _on_PatternType_pressed():
+func _on_PatternType_pressed() -> void:
-	Global.patterns_popup.connect(
+	var popup: Popup = Global.patterns_popup
-		"pattern_selected", self, "_on_Pattern_selected", [], CONNECT_ONESHOT
+	if !popup.is_connected("pattern_selected", self, "_on_Pattern_selected"):
-	)
+		popup.connect("pattern_selected", self, "_on_Pattern_selected", [], CONNECT_ONESHOT)
-	Global.patterns_popup.popup(Rect2($FillPattern/Type.rect_global_position, Vector2(226, 72)))
+	popup.popup(Rect2($FillPattern/Type.rect_global_position, Vector2(226, 72)))
 
 
 func _on_Pattern_selected(pattern: Patterns.Pattern) -> void:
@@ -101,7 +101,8 @@ func update_pattern() -> void:
 		else:
 			_pattern = Global.patterns_popup.default_pattern
 	var tex := ImageTexture.new()
-	tex.create_from_image(_pattern.image, 0)
+	if !_pattern.image.is_empty():
+		tex.create_from_image(_pattern.image, 0)
 	$FillPattern/Type/Texture.texture = tex
 	var size := _pattern.image.get_size()
 	$FillPattern/XOffset/OffsetX.max_value = size.x - 1
@@ -232,8 +233,10 @@ func _set_pixel(image: Image, x: int, y: int, color: Color) -> void:
 	if _fill_with == 0 or _pattern == null:
 		image.set_pixel(x, y, color)
 	else:
-		_pattern.image.lock()
 		var size := _pattern.image.get_size()
+		if size.x == 0 or size.y == 0:
+			return
+		_pattern.image.lock()
 		var px := int(x + _offset_x) % int(size.x)
 		var py := int(y + _offset_y) % int(size.y)
 		var pc := _pattern.image.get_pixel(px, py)

src/UI/Canvas/Selection.gd

@@ -672,6 +672,14 @@ func copy() -> void:
 	clipboard.big_bounding_rectangle = big_bounding_rectangle
 	clipboard.selection_offset = project.selection_offset
 
+	if !to_copy.is_empty():
+		var pattern: Patterns.Pattern = Global.patterns_popup.get_pattern(0)
+		pattern.image = to_copy
+		var tex := ImageTexture.new()
+		tex.create_from_image(to_copy, 0)
+		var container = Global.patterns_popup.get_node("ScrollContainer/PatternContainer")
+		container.get_child(0).get_child(0).texture = tex
+
 
 func paste() -> void:
 	if clipboard.image.is_empty():

src/UI/PatternsPopup.gd

@@ -11,25 +11,30 @@ class Pattern:
 	var index: int
 
 
+func _ready() -> void:
+	add(Image.new(), "Clipboard")
+
+
 func select_pattern(pattern: Pattern) -> void:
 	emit_signal("pattern_selected", pattern)
 	hide()
 
 
-static func create_button(image: Image) -> Node:
+func create_button(image: Image) -> Node:
 	var button: BaseButton = preload("res://src/UI/PatternButton.tscn").instance()
 	var tex := ImageTexture.new()
-	tex.create_from_image(image, 0)
+	if !image.is_empty():
+		tex.create_from_image(image, 0)
 	button.get_child(0).texture = tex
 	button.mouse_default_cursor_shape = Control.CURSOR_POINTING_HAND
 	return button
 
 
-static func add(image: Image, hint := "") -> void:
+func add(image: Image, hint := "") -> void:
 	var button = create_button(image)
 	button.pattern.image = image
 	button.hint_tooltip = hint
-	var container = Global.patterns_popup.get_node("ScrollContainer/PatternContainer")
+	var container = get_node("ScrollContainer/PatternContainer")
 	container.add_child(button)
 	button.pattern.index = button.get_index()