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