godot/doc/classes/Timer.xml

<?xml version="1.0" encoding="UTF-8" ?>
<class name="Timer" inherits="Node" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
	<brief_description>
		A countdown timer.
	</brief_description>
	<description>
		The [Timer] node is a countdown timer and is the simplest way to handle time-based logic in the engine. When a timer reaches the end of its [member wait_time], it will emit the [signal timeout] signal.
		After a timer enters the tree, it can be manually started with [method start]. A timer node is also started automatically if [member autostart] is [code]true[/code].
		Without requiring much code, a timer node can be added and configured in the editor. The [signal timeout] signal it emits can also be connected through the Node dock in the editor:
		[codeblock]
		func _on_timer_timeout():
		    print("Time to attack!")
		[/codeblock]
		[b]Note:[/b] To create a one-shot timer without instantiating a node, use [method SceneTree.create_timer].
		[b]Note:[/b] Timers are affected by [member Engine.time_scale]. The higher the time scale, the sooner timers will end. How often a timer processes may depend on the framerate or [member Engine.physics_ticks_per_second].
	</description>
	<tutorials>
		<link title="2D Dodge The Creeps Demo">https://godotengine.org/asset-library/asset/515</link>
	</tutorials>
	<methods>
		<method name="is_stopped" qualifiers="const">
			<return type="bool" />
			<description>
				Returns [code]true[/code] if the timer is stopped or has not started.
			</description>
		</method>
		<method name="start">
			<return type="void" />
			<param index="0" name="time_sec" type="float" default="-1" />
			<description>
				Starts the timer, if it was not started already. Fails if the timer is not inside the tree. If [param time_sec] is greater than [code]0[/code], this value is used for the [member wait_time].
				[b]Note:[/b] This method does not resume a paused timer. See [member paused].
			</description>
		</method>
		<method name="stop">
			<return type="void" />
			<description>
				Stops the timer.
			</description>
		</method>
	</methods>
	<members>
		<member name="autostart" type="bool" setter="set_autostart" getter="has_autostart" default="false">
			If [code]true[/code], the timer will start immediately when it enters the scene tree.
			[b]Note:[/b] After the timer enters the tree, this property is automatically set to [code]false[/code].
		</member>
		<member name="one_shot" type="bool" setter="set_one_shot" getter="is_one_shot" default="false">
			If [code]true[/code], the timer will stop after reaching the end. Otherwise, as by default, the timer will automatically restart.
		</member>
		<member name="paused" type="bool" setter="set_paused" getter="is_paused">
			If [code]true[/code], the timer is paused. A paused timer does not process until this property is set back to [code]false[/code], even when [method start] is called.
		</member>
		<member name="process_callback" type="int" setter="set_timer_process_callback" getter="get_timer_process_callback" enum="Timer.TimerProcessCallback" default="1">
			Specifies when the timer is updated during the main loop (see [enum TimerProcessCallback]).
		</member>
		<member name="time_left" type="float" setter="" getter="get_time_left">
			The timer's remaining time in seconds. This is always [code]0[/code] if the timer is stopped.
			[b]Note:[/b] This property is read-only and cannot be modified. It is based on [member wait_time].
		</member>
		<member name="wait_time" type="float" setter="set_wait_time" getter="get_wait_time" default="1.0">
			The time required for the timer to end, in seconds. This property can also be set every time [method start] is called.
			[b]Note:[/b] Timers can only process once per physics or process frame (depending on the [member process_callback]). An unstable framerate may cause the timer to end inconsistently, which is especially noticeable if the wait time is lower than roughly [code]0.05[/code] seconds. For very short timers, it is recommended to write your own code instead of using a [Timer] node. Timers are also affected by [member Engine.time_scale].
		</member>
	</members>
	<signals>
		<signal name="timeout">
			<description>
				Emitted when the timer reaches the end.
			</description>
		</signal>
	</signals>
	<constants>
		<constant name="TIMER_PROCESS_PHYSICS" value="0" enum="TimerProcessCallback">
			Update the timer every physics process frame (see [constant Node.NOTIFICATION_INTERNAL_PHYSICS_PROCESS]).
		</constant>
		<constant name="TIMER_PROCESS_IDLE" value="1" enum="TimerProcessCallback">
			Update the timer every process (rendered) frame (see [constant Node.NOTIFICATION_INTERNAL_PROCESS]).
		</constant>
	</constants>
</class>