godot-xterm/addons/gut/gui/ResizeHandle.gd

@tool
extends ColorRect
# #############################################################################
# Resize Handle control.  Place onto a control.  Set the orientation, then
# set the control that this should resize.  Then you can resize the control
# by dragging this thing around.  It's pretty neat.
# #############################################################################
enum ORIENTATION { LEFT, RIGHT }

@export var orientation := ORIENTATION.RIGHT:
	get:
		return orientation
	set(val):
		orientation = val
		queue_redraw()
@export var resize_control: Control = null
@export var vertical_resize := true

var _line_width = .5
var _line_color = Color(.4, .4, .4)
var _active_line_color = Color(.3, .3, .3)
var _invalid_line_color = Color(1, 0, 0)

var _grab_margin = 2
var _line_space = 3
var _num_lines = 8

var _mouse_down = false
# Called when the node enters the scene tree for the first time.


func _draw():
	var c = _line_color
	if resize_control == null:
		c = _invalid_line_color
	elif _mouse_down:
		c = _active_line_color

	if orientation == ORIENTATION.LEFT:
		_draw_resize_handle_left(c)
	else:
		_draw_resize_handle_right(c)


func _gui_input(event):
	if resize_control == null:
		return

	if orientation == ORIENTATION.LEFT:
		_handle_left_input(event)
	else:
		_handle_right_input(event)


# Draw the lines in the corner to show where you can
# drag to resize the dialog
func _draw_resize_handle_right(color):
	var br = size

	for i in range(_num_lines):
		var start = br - Vector2(i * _line_space, 0)
		var end = br - Vector2(0, i * _line_space)
		draw_line(start, end, color, _line_width, true)


func _draw_resize_handle_left(color):
	var bl = Vector2(0, size.y)

	for i in range(_num_lines):
		var start = bl + Vector2(i * _line_space, 0)
		var end = bl - Vector2(0, i * _line_space)
		draw_line(start, end, color, _line_width, true)


func _handle_right_input(event: InputEvent):
	if event is InputEventMouseMotion:
		if (
			_mouse_down
			and event.global_position.x > 0
			and event.global_position.y < DisplayServer.window_get_size().y
		):
			if vertical_resize:
				resize_control.size.y += event.relative.y
			resize_control.size.x += event.relative.x
	elif event is InputEventMouseButton:
		if event.button_index == MOUSE_BUTTON_LEFT:
			_mouse_down = event.pressed
			queue_redraw()


func _handle_left_input(event: InputEvent):
	if event is InputEventMouseMotion:
		if (
			_mouse_down
			and event.global_position.x > 0
			and event.global_position.y < DisplayServer.window_get_size().y
		):
			var start_size = resize_control.size
			resize_control.size.x -= event.relative.x
			if resize_control.size.x != start_size.x:
				resize_control.global_position.x += event.relative.x

			if vertical_resize:
				resize_control.size.y += event.relative.y
	elif event is InputEventMouseButton:
		if event.button_index == MOUSE_BUTTON_LEFT:
			_mouse_down = event.pressed
			queue_redraw()