display manager step event

//Window Drag
if !window_get_fullscreen()
{
    if !global.os_mobile
    {
        if mouse_check_button_pressed(mb_left)
        {
            mX = window_mouse_get_x();
            mY = window_mouse_get_y();
        }

        if mouse_check_button(mb_left)
        {
            posX -= mX - window_mouse_get_x();
            posY -= mY - window_mouse_get_y();
            window_set_position(window_get_x() + posX, window_get_y() + posY);
            mX = window_mouse_get_x();
            mY = window_mouse_get_y();
        }
    }
}
else if zoom != max_zoom
{
    zoom = max_zoom;
    show_debug_message("Zoom");
    window_set_size(ideal_width*zoom, ideal_height*zoom);
    surface_resize(application_surface, ideal_width*zoom, ideal_height*zoom);
    alarm[0]=1;

    ini_open("options.ini");
    ini_write_real("Camera", "Zoom", obj_display_manager.zoom);
    ini_close();
    show_debug_message("Zoom saved!");
}
//Zoom Window
if keyboard_check_pressed(vk_f11) || global.switchWindowMode
{
    ini_open("options.ini");
    ini_write_real("Window", "Mode", !window_get_fullscreen());
    ini_close();
    window_set_fullscreen(!window_get_fullscreen());
    show_debug_message("Window mode saved!");
    window_set_size(ideal_width*zoom, ideal_height*zoom);
    global.switchWindowMode = false;
}
if  keyboard_check_pressed(vk_f12) || global.changeScale// || keyboard_check_pressed(ord("Z"))
{
    if !window_get_fullscreen()
    {
	show_debug_message("Zoom");
        if keyboard_check(vk_shift)
            zoom--;
        else
            zoom++;

	if(zoom > max_zoom)
            zoom=1;
        else if zoom < 1
            zoom = max_zoom

        ideal_width=round(ideal_height*aspect_ratio);
        if display_get_width() % ideal_width != 0
        {
            var _d = round(display_get_width()/ideal_width);
            ideal_width = display_get_width()/_d;
        }
        if display_get_height() % ideal_height != 0
        {
            var _d = round(display_get_height()/ideal_height);
            ideal_height = display_get_height()/_d;
        }
        if(ideal_width & 1)
          ideal_width++;
        if(ideal_height & 1)
          ideal_height++;

	window_set_size(ideal_width*zoom, ideal_height*zoom);
	surface_resize(application_surface, ideal_width*zoom, ideal_height*zoom);
	alarm[0]=1;

        ini_open("options.ini");
        ini_write_real("Camera", "Zoom", obj_display_manager.zoom);
        ini_close();
        show_debug_message("Zoom saved!");
    }
    global.changeScale = false;
}
//Set Cursor
if window_get_fullscreen()
    window_set_cursor(cr_none);
else
    window_set_cursor(cr_default);