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add null-safety to FlxTouchManager #3440

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Jul 1, 2025
Merged

add null-safety to FlxTouchManager #3440

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67 changes: 23 additions & 44 deletions flixel/input/touch/FlxTouchManager.hx
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package flixel.input.touch;

#if FLX_TOUCH
import flixel.util.FlxDestroyUtil;
import openfl.Lib;
import openfl.events.TouchEvent;
import openfl.ui.Multitouch;
Expand All @@ -9,49 +10,43 @@ import openfl.ui.MultitouchInputMode;
/**
* @author Zaphod
*/
@:nullSafety(Strict)
class FlxTouchManager implements IFlxInputManager
{
/**
* The maximum number of concurrent touch points supported by the current device.
*/
public static var maxTouchPoints:Int = 0;
public static var maxTouchPoints(default, null):Int = 0;

/**
* All active touches including just created, moving and just released.
*/
public var list:Array<FlxTouch>;
public final list:Array<FlxTouch> = [];

/**
* Storage for inactive touches (some sort of cache for them).
*/
var _inactiveTouches:Array<FlxTouch>;
final _inactiveTouches:Array<FlxTouch> = [];

/**
* Helper storage for active touches (for faster access)
*/
var _touchesCache:Map<Int, FlxTouch>;
final _touchesCache:Map<Int, FlxTouch> = [];

/**
* WARNING: can be null if no active touch with the provided ID could be found
*/
public inline function getByID(TouchPointID:Int):FlxTouch
public inline function getByID(TouchPointID:Int):Null<FlxTouch>
{
return _touchesCache.get(TouchPointID);
}

/**
* Return the first touch if there is one, beware of null
*/
public function getFirst():FlxTouch
public function getFirst():Null<FlxTouch>
{
if (list[0] != null)
{
return list[0];
}
else
{
return null;
}
return list[0];
}

/**
Expand All @@ -60,19 +55,9 @@ class FlxTouchManager implements IFlxInputManager
@:noCompletion
public function destroy():Void
{
for (touch in list)
{
touch.destroy();
}
list = null;

for (touch in _inactiveTouches)
{
touch.destroy();
}
_inactiveTouches = null;

_touchesCache = null;
_touchesCache.clear();
FlxDestroyUtil.destroyArray(list);
FlxDestroyUtil.destroyArray(_inactiveTouches);
}

/**
Expand All @@ -88,11 +73,10 @@ class FlxTouchManager implements IFlxInputManager
TouchArray = new Array<FlxTouch>();
}

var touchLen:Int = TouchArray.length;

final touchLen:Int = TouchArray.length;
if (touchLen > 0)
{
TouchArray.splice(0, touchLen);
TouchArray.resize(0);
}

for (touch in list)
Expand All @@ -119,10 +103,10 @@ class FlxTouchManager implements IFlxInputManager
TouchArray = new Array<FlxTouch>();
}

var touchLen:Int = TouchArray.length;
final touchLen:Int = TouchArray.length;
if (touchLen > 0)
{
TouchArray.splice(0, touchLen);
TouchArray.resize(0);
}

for (touch in list)
Expand All @@ -141,26 +125,20 @@ class FlxTouchManager implements IFlxInputManager
*/
public function reset():Void
{
for (key in _touchesCache.keys())
{
_touchesCache.remove(key);
}
_touchesCache.clear();

for (touch in list)
{
touch.input.reset();
_inactiveTouches.push(touch);
}

list.splice(0, list.length);
list.resize(0);
}

@:allow(flixel.FlxG)
function new()
{
list = new Array<FlxTouch>();
_inactiveTouches = new Array<FlxTouch>();
_touchesCache = new Map<Int, FlxTouch>();
maxTouchPoints = Multitouch.maxTouchPoints;
Multitouch.inputMode = MultitouchInputMode.TOUCH_POINT;

Expand All @@ -174,7 +152,7 @@ class FlxTouchManager implements IFlxInputManager
*/
function handleTouchBegin(FlashEvent:TouchEvent):Void
{
var touch:FlxTouch = _touchesCache.get(FlashEvent.touchPointID);
var touch:Null<FlxTouch> = _touchesCache.get(FlashEvent.touchPointID);
if (touch != null)
{
touch.setXY(Std.int(FlashEvent.stageX), Std.int(FlashEvent.stageY));
Expand All @@ -192,7 +170,7 @@ class FlxTouchManager implements IFlxInputManager
*/
function handleTouchEnd(FlashEvent:TouchEvent):Void
{
var touch:FlxTouch = _touchesCache.get(FlashEvent.touchPointID);
final touch:Null<FlxTouch> = _touchesCache.get(FlashEvent.touchPointID);

if (touch != null)
{
Expand All @@ -205,7 +183,7 @@ class FlxTouchManager implements IFlxInputManager
*/
function handleTouchMove(FlashEvent:TouchEvent):Void
{
var touch:FlxTouch = _touchesCache.get(FlashEvent.touchPointID);
final touch:Null<FlxTouch> = _touchesCache.get(FlashEvent.touchPointID);

if (touch != null)
{
Expand Down Expand Up @@ -239,7 +217,8 @@ class FlxTouchManager implements IFlxInputManager
{
if (_inactiveTouches.length > 0)
{
var touch:FlxTouch = _inactiveTouches.pop();
@:nullSafety(Off)
final touch:FlxTouch = _inactiveTouches.pop();
touch.recycle(X, Y, PointID, pressure);
return add(touch);
}
Expand Down