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180 lines
5.2 KiB
180 lines
5.2 KiB
/** |
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* @licstart The following is the entire license notice for the |
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* Javascript code in this page |
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* |
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* Copyright 2019 Mozilla Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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* @licend The above is the entire license notice for the |
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* Javascript code in this page |
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*/ |
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"use strict"; |
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Object.defineProperty(exports, "__esModule", { |
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value: true |
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}); |
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exports.GrabToPan = GrabToPan; |
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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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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._endPan = this._endPan.bind(this); |
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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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CSS_CLASS_GRAB: 'grab-to-pan-grab', |
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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.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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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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ignoreTarget: function GrabToPan_ignoreTarget(node) { |
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return node[matchesSelector]('a[href], a[href] *, input, textarea, button, button *, select, option'); |
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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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event.originalTarget.tagName; |
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} catch (e) { |
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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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this.element.addEventListener('scroll', this._endPan, true); |
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event.preventDefault(); |
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event.stopPropagation(); |
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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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_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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var scrollTop = this.scrollTopStart - yDiff; |
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var scrollLeft = this.scrollLeftStart - xDiff; |
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if (this.element.scrollTo) { |
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this.element.scrollTo({ |
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top: scrollTop, |
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left: scrollLeft, |
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behavior: 'instant' |
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}); |
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} else { |
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this.element.scrollTop = scrollTop; |
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this.element.scrollLeft = scrollLeft; |
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} |
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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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_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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this.overlay.remove(); |
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} |
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}; |
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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; |
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}); |
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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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var isSafari6plus = /Apple/.test(navigator.vendor) && /Version\/([6-9]\d*|[1-5]\d+)/.test(navigator.userAgent); |
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function isLeftMouseReleased(event) { |
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if ('buttons' in event && isNotIEorIsIE10plus) { |
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return !(event.buttons & 1); |
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} |
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if (isChrome15OrOpera15plus || isSafari6plus) { |
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return event.which === 0; |
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} |
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return false; |
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} |