mirror of
https://git.sindominio.net/estibadores/wordpress.git
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249 lines
9.7 KiB
JavaScript
249 lines
9.7 KiB
JavaScript
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var pdfembGrabToPan = (function GrabToPanClosure() {
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/**
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* Construct a GrabToPan instance for a given HTML element.
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* @param options.element {Element}
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* @param options.ignoreTarget {function} optional. See `ignoreTarget(node)`
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* @param options.onActiveChanged {function(boolean)} optional. Called
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* when grab-to-pan is (de)activated. The first argument is a boolean that
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* shows whether grab-to-pan is activated.
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*/
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function GrabToPan(options) {
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this.element = options.element;
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this.document = options.element.ownerDocument;
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if (typeof options.ignoreTarget === 'function') {
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this.ignoreTarget = options.ignoreTarget;
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}
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this.onActiveChanged = options.onActiveChanged;
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// Bind the contexts to ensure that `this` always points to
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// the GrabToPan instance.
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this.activate = this.activate.bind(this);
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this.deactivate = this.deactivate.bind(this);
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this.toggle = this.toggle.bind(this);
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this._onmousedown = this._onmousedown.bind(this);
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this._onmousemove = this._onmousemove.bind(this);
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this._onmousewheel = this._onmousewheel.bind(this);
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this._endPan = this._endPan.bind(this);
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// This overlay will be inserted in the document when the mouse moves during
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// a grab operation, to ensure that the cursor has the desired appearance.
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var overlay = this.overlay = document.createElement('div');
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overlay.className = 'grab-to-pan-grabbing';
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}
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GrabToPan.prototype = {
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/**
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* Class name of element which can be grabbed
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*/
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CSS_CLASS_GRAB: 'grab-to-pan-grab',
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/**
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* Bind a mousedown event to the element to enable grab-detection.
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*/
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activate: function GrabToPan_activate() {
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if (!this.active) {
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this.active = true;
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this.element.addEventListener('mousedown', this._onmousedown, true);
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this.element.addEventListener('mousewheel', this._onmousewheel);
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this.element.addEventListener('wheel', this._onmousewheel);
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this.element.addEventListener('DOMMouseScroll', this._onmousewheel);
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this.element.classList.add(this.CSS_CLASS_GRAB);
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if (this.onActiveChanged) {
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this.onActiveChanged(true);
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}
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}
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},
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/**
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* Removes all events. Any pending pan session is immediately stopped.
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*/
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deactivate: function GrabToPan_deactivate() {
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if (this.active) {
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this.active = false;
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this.element.removeEventListener('mousedown', this._onmousedown, true);
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this._endPan();
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this.element.classList.remove(this.CSS_CLASS_GRAB);
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if (this.onActiveChanged) {
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this.onActiveChanged(false);
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}
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}
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},
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toggle: function GrabToPan_toggle() {
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if (this.active) {
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this.deactivate();
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} else {
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this.activate();
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}
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},
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/**
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* Whether to not pan if the target element is clicked.
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* Override this method to change the default behaviour.
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*
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* @param node {Element} The target of the event
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* @return {boolean} Whether to not react to the click event.
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*/
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ignoreTarget: function GrabToPan_ignoreTarget(node) {
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// Use matchesSelector to check whether the clicked element
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// is (a child of) an input element / link
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return node[matchesSelector](
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'a[href], a[href] *, input, textarea, button, button *, select, option'
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);
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},
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/**
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* @private
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*/
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_onmousedown: function GrabToPan__onmousedown(event) {
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if (event.button !== 0 || this.ignoreTarget(event.target)) {
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return;
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}
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if (event.originalTarget) {
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try {
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/* jshint expr:true */
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var ottn = event.originalTarget.tagName;
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} catch (e) {
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// Mozilla-specific: element is a scrollbar (XUL element)
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return;
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}
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}
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this.scrollLeftStart = this.element.scrollLeft;
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this.scrollTopStart = this.element.scrollTop;
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this.clientXStart = event.clientX;
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this.clientYStart = event.clientY;
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this.document.addEventListener('mousemove', this._onmousemove, true);
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this.document.addEventListener('mouseup', this._endPan, true);
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// When a scroll event occurs before a mousemove, assume that the user
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// dragged a scrollbar (necessary for Opera Presto, Safari and IE)
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// (not needed for Chrome/Firefox)
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this.element.addEventListener('scroll', this._endPan, true);
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event.preventDefault();
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event.stopPropagation();
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this.document.documentElement.classList.add(this.CSS_CLASS_GRABBING);
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var focusedElement = document.activeElement;
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if (focusedElement && !focusedElement.contains(event.target)) {
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focusedElement.blur();
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}
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},
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/**
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* @private
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*/
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_onmousemove: function GrabToPan__onmousemove(event) {
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this.element.removeEventListener('scroll', this._endPan, true);
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if (isLeftMouseReleased(event)) {
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this._endPan();
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return;
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}
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var xDiff = event.clientX - this.clientXStart;
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var yDiff = event.clientY - this.clientYStart;
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this.element.scrollTop = this.scrollTopStart - yDiff;
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this.element.scrollLeft = this.scrollLeftStart - xDiff;
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if (!this.overlay.parentNode) {
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document.body.appendChild(this.overlay);
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}
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},
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/**
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* @private
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*/
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_onmousewheel: function GrabToPan__onmousewheel(event) {
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this.element.removeEventListener('scroll', this._endPan, true);
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var MOUSE_WHEEL_DELTA_FACTOR = 0.5;
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if (event.deltaMode) {
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// if 0, means measured in pixels
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if (event.deltaMode == 1) { //Measured in lines
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MOUSE_WHEEL_DELTA_FACTOR = 10;
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}
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if (event.deltaMode == 2) { // Measured in pages
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MOUSE_WHEEL_DELTA_FACTOR = 1000;
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}
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}
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var ticks = event.deltaY ? -event.deltaY // 'wheel'
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: ( event.wheelDelta ? event.wheelDelta // 'mousewheel'
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: -event.detail // 'DOMMouseScroll'
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);
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this.scrollLeftStart = this.element.scrollLeft;
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this.scrollTopStart = this.element.scrollTop;
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var yDiff = ticks * MOUSE_WHEEL_DELTA_FACTOR;
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this.element.scrollTop = this.scrollTopStart - yDiff;
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if (!this.overlay.parentNode) {
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document.body.appendChild(this.overlay);
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}
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if (this.element.scrollTop != this.scrollTopStart || yDiff == 0) {
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event.preventDefault();
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return false;
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}
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},
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/**
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* @private
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*/
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_endPan: function GrabToPan__endPan() {
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this.element.removeEventListener('scroll', this._endPan, true);
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this.document.removeEventListener('mousemove', this._onmousemove, true);
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this.document.removeEventListener('mouseup', this._endPan, true);
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if (this.overlay.parentNode) {
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this.overlay.parentNode.removeChild(this.overlay);
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}
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}
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};
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// Get the correct (vendor-prefixed) name of the matches method.
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var matchesSelector;
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['webkitM', 'mozM', 'msM', 'oM', 'm'].some(function(prefix) {
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var name = prefix + 'atches';
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if (name in document.documentElement) {
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matchesSelector = name;
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}
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name += 'Selector';
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if (name in document.documentElement) {
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matchesSelector = name;
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}
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return matchesSelector; // If found, then truthy, and [].some() ends.
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});
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// Browser sniffing because it's impossible to feature-detect
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// whether event.which for onmousemove is reliable
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var isNotIEorIsIE10plus = !document.documentMode || document.documentMode > 9;
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var chrome = window.chrome;
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var isChrome15OrOpera15plus = chrome && (chrome.webstore || chrome.app);
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// ^ Chrome 15+ ^ Opera 15+
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var isSafari6plus = /Apple/.test(navigator.vendor) &&
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/Version\/([6-9]\d*|[1-5]\d+)/.test(navigator.userAgent);
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/**
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* Whether the left mouse is not pressed.
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* @param event {MouseEvent}
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* @return {boolean} True if the left mouse button is not pressed.
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* False if unsure or if the left mouse button is pressed.
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*/
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function isLeftMouseReleased(event) {
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if ('buttons' in event && isNotIEorIsIE10plus) {
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// http://www.w3.org/TR/DOM-Level-3-Events/#events-MouseEvent-buttons
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// Firefox 15+
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// Internet Explorer 10+
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return !(event.buttons | 1);
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}
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if (isChrome15OrOpera15plus || isSafari6plus) {
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// Chrome 14+
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// Opera 15+
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// Safari 6.0+
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return event.which === 0;
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}
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}
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return GrabToPan;
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})();
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