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POUnable to detect "cross slide" gesture when element is scrollable
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  1. POUnable to detect "cross slide" gesture when element is scrollable
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    copied!<p>I'm currently trying to detect a cross-slide gesture on a <code>div</code> using the <code>Windows.UI.Input.GestureRecognizer</code> class.</p> <p>I have been able to successfully achieve the detection of this gesture <em>except</em> when the element is in a scrollable region.</p> <p>Specifically, when it <em>is</em> in a scrollable region, I receive an <code>MSPointerCancel</code> event almost immediately after the <code>MSPointerDown</code> event -- if I move the touch interaction slowly, I do see <em>some</em> <code>MSPointerMove</code> events, but then it goes off and cancels it.</p> <p>Digging into the <code>WinJS.UI.ListView</code> implementation, I'm pretty much doing the same things. That behavior <em>does</em> work, so I don't believe this is an issue with drivers or the simulator.</p> <p>To see this code cross sliding, change the CSS as follows:</p> <p><code>.container</code>: Change <code>width: 3000px</code> to <code>width: 300px</code></p> <p><strong>Sample Code</strong></p> <p>This code can be tested by creating a Blank JavaScript application in Visual Studio, and pasting the code in where discussed below.</p> <p><em>JavaScript, end of Default.js</em></p> <pre><code>WinJS.Namespace.define("Sample", { Swiper: WinJS.Class.define(function (el, options) { this.element = el; WinJS.UI.setOptions(options); this.mouseUp = this.mouseUp.bind(this); this.keyPress = this.keyPress.bind(this); //el.addEventListener("mouseup", this.mouseUp, true); el.addEventListener("keypress", this.keyPress); // Gesture events this.pointerDown = this.pointerDown.bind(this); this.pointerMove = this.pointerMove.bind(this); this.pointerUp = this.pointerUp.bind(this); this.pointerCancel = this.pointerCancel.bind(this); el.addEventListener("MSPointerDown", this.pointerDown, true); el.addEventListener("MSPointerMove", this.pointerMove, true); el.addEventListener("MSPointerUp", this.pointerUp, true); el.addEventListener("MSPointerCancel", this.pointerCancel, true); }, { element: null, _recognizer: null, wasSelected: false, currentTarget: null, pointer: null, mouseUp: function (e) { if(!e) { return; } if(e.button !== Sample.Swiper.RIGHT_MOUSE) { return; } if (!WinJS.Utilities.hasClass(e.srcElement, "swipeable")) { return; } this._toggleSelection(e.srcElement); }, keyPress: function (e) { if (!e) { return; } if (e.keyCode !== WinJS.Utilities.Key.space) { return; } if (!WinJS.Utilities.hasClass(e.srcElement, "swipeable")) { return; } this._toggleSelection(e.srcElement); }, pointerDown: function (e) { console.log("Pointer: Down"); if (!WinJS.Utilities.hasClass(e.srcElement, "swipeable")) { return; } var p = Windows.UI.Input.PointerPoint.getCurrentPoint(e.pointerId); var touch = (e.pointerType === Sample.Swiper.TOUCH); var pointerProperties = p.properties; this.pointer = e.pointerId; if (!touch) { this.mouseUp(e); return; } this.currentTarget = e.srcElement; window.proxy.msSetPointerCapture(p.pointerId); this._getRecognizer().processDownEvent(p); //e.stopImmediatePropagation(); e.preventDefault(); }, pointerMove: function (e) { if (e.pointerId !== this.pointer) { return; } console.log("Pointer: Move"); var ips = Windows.UI.Input.PointerPoint.getIntermediatePoints(e.pointerId); this._getRecognizer().processMoveEvents(ips); //e.stopImmediatePropagation(); }, pointerUp: function (e) { if (e.pointerId !== this.pointer) { return; } console.log("Pointer: Up"); var p = Windows.UI.Input.PointerPoint.getCurrentPoint(e.pointerId); this._getRecognizer().processUpEvent(p); //e.stopImmediatePropagation(); }, pointerCancel: function (e) { if (e.pointerId !== this.pointer) { return; } console.log("Pointer: Canceled"); this._getRecognizer().completeGesture(); e.stopImmediatePropagation(); }, _toggleSelection: function (el) { WinJS.Utilities.toggleClass(el, "selected"); }, _getRecognizer: function () { if (this._recognizer) { return this._recognizer; } var gr = new Windows.UI.Input.GestureRecognizer(); gr.showGestureFeedback = false; var thresholds = gr.crossSlideThresholds; thresholds.selectionStart = WinJS.UI._VERTICAL_SWIPE_SELECTION_THRESHOLD; thresholds.speedBumpStart = WinJS.UI._VERTICAL_SWIPE_SPEED_BUMP_START; thresholds.speedBumpEnd = WinJS.UI._VERTICAL_SWIPE_SPEED_BUMP_END; thresholds.rearrangeStart = null; gr.crossSlideThresholds = thresholds; gr.crossSlideHorizontally = false; var settings = Windows.UI.Input.GestureSettings; gr.gestureSettings = settings.crossSlide; gr.addEventListener("crosssliding", function (e) { var el = this.currentTarget || document.createElement("div"); console.log("CrossSlide State: " + e.crossSlidingState); switch (e.crossSlidingState) { case Windows.UI.Input.CrossSlidingState.selecting: this.wasSelected = true; break; case Windows.UI.Input.CrossSlidingState.completed: if (this.wasSelected) { this._toggleSelection(this.currentTarget); } this.wasSelected = false; this.currentTarget = false; break; default: this.wasSelected = false; break; } }.bind(this)); gr.addEventListener("manipulationstarted", function (e) { debugger; }); this._recognizer = gr; return gr; } }, { RIGHT_MOUSE: 2, TOUCH: 2, }), }); </code></pre> <p><em>HTML, replace body in default.html</em></p> <pre><code>&lt;body&gt; &lt;div class="scroller" data-win-control="Sample.Swiper"&gt; &lt;div id="proxy"&gt;&lt;/div&gt; &lt;div class="container"&gt; &lt;div class="item swipeable" tabindex="0"&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/body&gt; </code></pre> <p><em>CSS, add to default.css</em></p> <pre><code>.scroller { width: 100vw; height: 100vh; overflow-x: auto; -ms-touch-action: auto; } .container { width: 3000px; height: 100vh; display: -ms-grid; -ms-grid-columns: 1fr 100px 1fr; -ms-grid-rows: 1fr 100px 1fr; } .item { background-color: red; -ms-grid-column: 2; -ms-grid-row: 2; } .selected { outline-color: white; outline-style: solid; outline-width: 3px; } </code></pre>
 

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