initial commit

node_modules/hammerjs/src/input/touch.js

@@ -0,0 +1,98 @@
+var TOUCH_INPUT_MAP = {
+    touchstart: INPUT_START,
+    touchmove: INPUT_MOVE,
+    touchend: INPUT_END,
+    touchcancel: INPUT_CANCEL
+};
+
+var TOUCH_TARGET_EVENTS = 'touchstart touchmove touchend touchcancel';
+
+/**
+ * Multi-user touch events input
+ * @constructor
+ * @extends Input
+ */
+function TouchInput() {
+    this.evTarget = TOUCH_TARGET_EVENTS;
+    this.targetIds = {};
+
+    Input.apply(this, arguments);
+}
+
+inherit(TouchInput, Input, {
+    handler: function MTEhandler(ev) {
+        var type = TOUCH_INPUT_MAP[ev.type];
+        var touches = getTouches.call(this, ev, type);
+        if (!touches) {
+            return;
+        }
+
+        this.callback(this.manager, type, {
+            pointers: touches[0],
+            changedPointers: touches[1],
+            pointerType: INPUT_TYPE_TOUCH,
+            srcEvent: ev
+        });
+    }
+});
+
+/**
+ * @this {TouchInput}
+ * @param {Object} ev
+ * @param {Number} type flag
+ * @returns {undefined|Array} [all, changed]
+ */
+function getTouches(ev, type) {
+    var allTouches = toArray(ev.touches);
+    var targetIds = this.targetIds;
+
+    // when there is only one touch, the process can be simplified
+    if (type & (INPUT_START | INPUT_MOVE) && allTouches.length === 1) {
+        targetIds[allTouches[0].identifier] = true;
+        return [allTouches, allTouches];
+    }
+
+    var i,
+        targetTouches,
+        changedTouches = toArray(ev.changedTouches),
+        changedTargetTouches = [],
+        target = this.target;
+
+    // get target touches from touches
+    targetTouches = allTouches.filter(function(touch) {
+        return hasParent(touch.target, target);
+    });
+
+    // collect touches
+    if (type === INPUT_START) {
+        i = 0;
+        while (i < targetTouches.length) {
+            targetIds[targetTouches[i].identifier] = true;
+            i++;
+        }
+    }
+
+    // filter changed touches to only contain touches that exist in the collected target ids
+    i = 0;
+    while (i < changedTouches.length) {
+        if (targetIds[changedTouches[i].identifier]) {
+            changedTargetTouches.push(changedTouches[i]);
+        }
+
+        // cleanup removed touches
+        if (type & (INPUT_END | INPUT_CANCEL)) {
+            delete targetIds[changedTouches[i].identifier];
+        }
+        i++;
+    }
+
+    if (!changedTargetTouches.length) {
+        return;
+    }
+
+    return [
+        // merge targetTouches with changedTargetTouches so it contains ALL touches, including 'end' and 'cancel'
+        uniqueArray(targetTouches.concat(changedTargetTouches), 'identifier', true),
+        changedTargetTouches
+    ];
+}