Use Control + Wheel to change brush size - implements #776

This is not editable in the shortcut settings and it is temporary way of doing this and it will change in Godot 4.x.

src/Tools/Draw.tscn

@@ -60,6 +60,7 @@ value = 1.0
 allow_greater = true
 prefix = "Size:"
 suffix = "px"
+is_global = true
 
 [node name="ColorInterpolation" parent="." index="3" instance=ExtResource( 1 )]
 visible = false

src/UI/Canvas/CameraMovement.gd

@@ -115,9 +115,9 @@ func _input(event: InputEvent) -> void:
 		drag = true
 	elif event.is_action_released("pan"):
 		drag = false
-	elif event.is_action_pressed("zoom_in"):  # Wheel Up Event
+	elif event.is_action_pressed("zoom_in", false, true):  # Wheel Up Event
 		zoom_camera(-1)
-	elif event.is_action_pressed("zoom_out"):  # Wheel Down Event
+	elif event.is_action_pressed("zoom_out", false, true):  # Wheel Down Event
 		zoom_camera(1)
 
 	elif event is InputEventMagnifyGesture:  # Zoom Gesture on a Laptop touchpad

src/UI/Nodes/ValueSlider.gd

@@ -21,6 +21,10 @@ export var snap_by_default := false
 export var show_progress := true
 export var show_arrows := true setget _show_arrows_changed
 export var echo_arrow_time := 0.075
+# This will be replaced with input action strings in Godot 4.x
+# Right now this is only used for changing the brush size with Control + Wheel
+# In Godot 4.x, the shortcut will be editable
+export var is_global := false
 
 var state := NORMAL
 var arrow_is_held := 0  # Used for arrow button echo behavior. Is 1 for ValueUp, -1 for ValueDown.
@@ -30,6 +34,7 @@ onready var timer: Timer = $Timer
 
 
 func _ready() -> void:
+	set_process_input(is_global)
 	_reset_display()
 	if not Engine.editor_hint:  # Pixelorama specific code
 		$ValueUp.modulate = Global.modulate_icon_color
@@ -41,6 +46,30 @@ func _notification(what: int) -> void:
 		_reset_display()
 
 
+func _input(event: InputEvent) -> void:
+	if not editable:
+		return
+	# Hardcode Control + Wheel as a global shortcut, if is_global is true
+	# In Godot 4.x this will change into two is_action() checks for incrementing
+	# and decrementing
+	if not event is InputEventMouseButton:
+		return
+	if not event.pressed:
+		return
+	if not event.control:
+		return
+	if event.button_index == BUTTON_WHEEL_UP:
+		if snap_by_default:
+			value += step if event.control else snap_step
+		else:
+			value += snap_step if event.control else step
+	elif event.button_index == BUTTON_WHEEL_DOWN:
+		if snap_by_default:
+			value -= step if event.control else snap_step
+		else:
+			value -= snap_step if event.control else step
+
+
 func _gui_input(event: InputEvent) -> void:
 	if not editable:
 		return