Funkin/source/funkin/util/MouseUtil.hx

package funkin.util;

import flixel.math.FlxPoint;

/**
 * Utility functions related to the mouse.
 */
class MouseUtil
{
  static var oldCamPos:FlxPoint = new FlxPoint();
  static var oldMousePos:FlxPoint = new FlxPoint();

  /**
   * Used to be for general camera middle click dragging, now generalized for any click and drag type shit!
   * Listen I don't make the rules here
   * @param target what you want to be dragged, defaults to CAMERA SCROLL
   * @param jusPres the "justPressed", should be a button of some sort
   * @param pressed the "pressed", which should be the same button as `jusPres`
   */
  public static function mouseCamDrag(?target:FlxPoint, ?jusPres:Bool, ?pressed:Bool):Void
  {
    if (target == null) target = FlxG.camera.scroll;

    if (jusPres == null) jusPres = FlxG.mouse.justPressedMiddle;

    if (pressed == null) pressed = FlxG.mouse.pressedMiddle;

    if (jusPres)
    {
      oldCamPos.set(target.x, target.y);
      oldMousePos.set(FlxG.mouse.screenX, FlxG.mouse.screenY);
    }

    if (pressed)
    {
      target.x = oldCamPos.x - (FlxG.mouse.screenX - oldMousePos.x);
      target.y = oldCamPos.y - (FlxG.mouse.screenY - oldMousePos.y);
    }
  }

  /**
   * Increment the zoom level of the current camera by the mouse wheel scroll value.
   */
  public static function mouseWheelZoom():Void
  {
    if (FlxG.mouse.wheel != 0) FlxG.camera.zoom += FlxG.mouse.wheel * (0.1 * FlxG.camera.zoom);
  }
}