fgdata/gui/dialogs/stopwatch.xml

<?xml version="1.0"?>

<PropertyList>
	<name>stopwatch-dialog</name>
	<layout>vbox</layout>
	<modal>false</modal>
	<default-padding>8</default-padding>
	<x>-5</x>
	<y>5</y>
	<color>
		<alpha>0.7</alpha>
	</color>

	<nasal>
		<open>
			var p = "/sim/gui/dialogs/stopwatch-dialog/";
			var display = props.globals.getNode(p ~ "display", 1);
			var time = props.globals.getNode("/sim/time/elapsed-sec");

			var start_time = props.globals.getNode(p ~ "start-time", 1).getValue();
			var accu = props.globals.getNode(p ~ "accu", 1).getValue();
			if (start_time == nil)
				start_time = 0;
			if (accu == nil)
				accu = 0;

			var r = props.globals.getNode(p ~ "running");
			var running = r != nil ? r.getBoolValue() : 0;

			var start = func {
				if (!running) {
					start_time = time.getValue();
					running = 1;
					loop();
				}
			}

			var stop = func {
				if (running) {
					running = 0;
					show(accu += time.getValue() - start_time);
				}
			}

			var reset = func {
				accu = 0;
				if (running)
					start_time = time.getValue();
				else
					show(0);
			}

			var loop = func {
				if (running) {
					show(time.getValue() - start_time + accu);
					settimer(loop, 0.02);
				}
			}

			var show = func(s) {
				var hours = s / 3600;
				var minutes = int(math.mod(s / 60, 60));
				var seconds = int(math.mod(s, 60));
				var msec = int(math.mod(s * 1000, 1000) / 100);
				var d = sprintf("%3d : %02d : %02d.%d", hours, minutes, seconds, msec);
				display.setValue(d);
			}

			if (running) {
				loop();
			} else {
				if (accu == nil)
					accu = 0;
				show(accu);
			}
		</open>

		<close>
			props.globals.getNode(p ~ "start-time", 1).setDoubleValue(start_time);
			props.globals.getNode(p ~ "running", 1).setBoolValue(running);
			props.globals.getNode(p ~ "accu", 1).setDoubleValue(accu);
			running = 0;	# stop display loop
		</close>
	</nasal>

	<text>
		<label>xxxxx000 : 00 : 00.0</label>
		<halign>center</halign>
		<live>true</live>
		<property>/sim/gui/dialogs/stopwatch-dialog/display</property>
		<font>
            <property>sim/gui/selected-style/fonts/gui-large</property>
        </font>
		<color>
			<red>1</red>
			<green>0.9</green>
			<blue>0</blue>
			<alpha>1</alpha>
		</color>
	</text>

	<group>
		<layout>hbox</layout>
		<default-padding>2</default-padding>

		<button>
			<legend>Start</legend>
			<equal>true</equal>
			<color>
				<alpha type="float">0.8</alpha>
			</color>
			<binding>
				<command>nasal</command>
				<script>start()</script>
			</binding>
		</button>

		<button>
			<legend>Stop</legend>
			<default>true</default>
			<color>
				<alpha type="float">0.8</alpha>
			</color>
			<binding>
				<command>nasal</command>
				<script>stop()</script>
			</binding>
		</button>

		<button>
			<legend>Reset</legend>
			<key>Delete</key>
			<color>
				<alpha type="float">0.8</alpha>
			</color>
			<binding>
				<command>nasal</command>
				<script>reset()</script>
			</binding>
		</button>

		<button>
			<legend>Close</legend>
			<color>
				<alpha type="float">0.8</alpha>
			</color>
			<key>Esc</key>
			<binding>
				<command>dialog-close</command>
			</binding>
		</button>
	</group>
</PropertyList>