Fixes #2062 and forward-support for pointer modes

Impact:
  - *none for touch devices*
  - *low* / 'expected behavior' for mouse devices

Adds a PointerMode enumeration value for better simple input
discrimination in the future.

The added Button#justReleasedPreventsOver controls if a just-release event
on a pointer prevents it from being able to trigger an over event.

The default value is PointerMode.CONTACT which means this 'release guard'
applies only to touch inputs.

It should fix #2062 as Mouse (PointerMode.CURSOR) input is not caught in the default.

Also expands Button#forceOut to accept a PointerMode value such that it
can be controlled per-input mode.

This is a configurable partial revert of a possibly rogue commit in 2.1.3
and the behavior persists through 2.4.3.

src/gameobjects/Button.js

@@ -166,11 +166,21 @@ Phaser.Button = function (game, x, y, key, callback, callbackContext, overFrame,
     /**
     * If true then onOver events (such as onOverSound) will only be triggered if the Pointer object causing them was the Mouse Pointer.
     * The frame will still be changed as applicable.
+    *
     * @property {boolean} onOverMouseOnly
     * @default
     */
     this.onOverMouseOnly = false;
 
+    /**
+    * Suppresse the over event if a pointer was just released and it matches the given {@link Phaser.PointerModer pointer mode bitmask}.
+    *
+    * This behavior was introduced in Phaser 2.3.1; this property is a soft-revert of the change.
+    *
+    * @property {Phaser.PointerMode?} justReleasedPreventsOver=ACTIVE_CURSOR
+    */
+    this.justReleasedPreventsOver = Phaser.PointerMode.TOUCH;
+    
     /**
     * When true the the texture frame will not be automatically switched on up/down/over/out events.
     * @property {boolean} freezeFrames
@@ -180,7 +190,10 @@ Phaser.Button = function (game, x, y, key, callback, callbackContext, overFrame,
 
     /**
     * When the Button is touched / clicked and then released you can force it to enter a state of "out" instead of "up".
-    * @property {boolean} forceOut
+    *
+    * This can also accept a {@link Phaser.PointerModer pointer mode bitmask} for more refined control.
+    *
+    * @property {boolean|Phaser.PointerMode} forceOut=false
     * @default
     */
     this.forceOut = false;
@@ -472,9 +485,10 @@ Phaser.Button.prototype.setUpSound = function (sound, marker) {
 */
 Phaser.Button.prototype.onInputOverHandler = function (sprite, pointer) {
 
-    //  If the Pointer was only just released then we don't fire an over event
-    if (pointer.justReleased())
+    if (pointer.justReleased() &&
+        (this.justReleasedPreventsOver & pointer.pointerMode) === pointer.pointerMode)
     {
+        //  If the Pointer was only just released then we don't fire an over event
         return;
     }
 
@@ -557,7 +571,7 @@ Phaser.Button.prototype.onInputUpHandler = function (sprite, pointer, isOver) {
         return;
     }
 
-    if (this.forceOut)
+    if (this.forceOut === true || (this.forceOut & pointer.pointerMode) === pointer.pointerMode)
     {
         this.changeStateFrame(STATE_OUT);
     }

src/input/Input.js

@@ -374,7 +374,7 @@ Phaser.Input.prototype = {
     */
     boot: function () {
 
-        this.mousePointer = new Phaser.Pointer(this.game, 0);
+        this.mousePointer = new Phaser.Pointer(this.game, 0, Phaser.PointerMode.CURSOR);
         this.addPointer();
         this.addPointer();
 
@@ -517,7 +517,7 @@ Phaser.Input.prototype = {
         }
 
         var id = this.pointers.length + 1;
-        var pointer = new Phaser.Pointer(this.game, id);
+        var pointer = new Phaser.Pointer(this.game, id, Phaser.PointerMode.TOUCH);
 
         this.pointers.push(pointer);
         this['pointer' + id] = pointer;

src/input/Pointer.js

@@ -11,8 +11,9 @@
 * @constructor
 * @param {Phaser.Game} game - A reference to the currently running game.
 * @param {number} id - The ID of the Pointer object within the game. Each game can have up to 10 active pointers.
+* @param {Phaser.PointerMode} pointerMode=(CURSOR|CONTACT) - The operational mode of this pointer, eg. CURSOR or TOUCH.
 */
-Phaser.Pointer = function (game, id) {
+Phaser.Pointer = function (game, id, pointerMode) {
 
     /**
     * @property {Phaser.Game} game - A reference to the currently running game.
@@ -48,6 +49,11 @@ Phaser.Pointer = function (game, id) {
     */
     this.pointerId = null;
 
+    /**
+    * @property {Phaser.PointerMode} pointerMode - The operational mode of this pointer.
+    */
+    this.pointerMode = pointerMode || (Phaser.PointerMode.CURSOR | Phaser.PointerMode.CONTACT);
+
     /**
     * @property {any} target - The target property of the Pointer as set by the DOM event when this Pointer is started.
     * @default
@@ -1189,3 +1195,32 @@ Object.defineProperty(Phaser.Pointer.prototype, "worldY", {
     }
 
 });
+
+/**
+* Enumeration categorizing operational modes of pointers.
+*
+* PointerType values represent valid bitmasks.
+* For example, a value representing both Mouse and Touch devices
+* can be expressed as `PointerMode.CURSOR | PointerMode.CONTACT`.
+*
+* Values may be added for future mode categorizations.
+* @class Phaser.PointerMode
+*/
+Phaser.PointerMode = {
+
+    /**
+    * A 'CURSOR' is a pointer with a *passive cursor* such as a mouse, touchpad, watcom stylus, or even TV-control arrow-pad.
+    *
+    * It has the property that a cursor is passively moved without activating the input.
+    * This currently corresponds with {@link Phaser.Pointer#isMouse} property.
+    * @constant
+    */
+    CURSOR: 1 << 0,
+
+    /**
+    * A 'CONTACT' pointer has an *active cursor* that only tracks movement when actived; notably this is a touch-style input.
+    * @constant
+    */
+    CONTACT: 1 << 1
+
+};