1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 | 1× 3× 1× 1× 1× 1× 26× 26× 26× 26× 26× 26× 26× 26× 26× 26× 1× 1× 4× 1× 1× 44× 44× 44× 23× 23× 1× 8× 1× 7× 7× 7× 7× 7× 7× 3× 4× 7× 3× 3× 3× 3× 4× 1× 3× 4× 1× 19× 19× 1× 42× 42× 42× 42× 42× 42× 42× 1× 29× 29× 29× 29× 1× 29× 24× 29× 29× 1× 26× | import { event as domEvent, closest as domClosest } from 'min-dom'; import { getStepSize, cap } from './ZoomUtil'; import { log10 } from '../../util/Math'; import { bind } from 'min-dash'; var sign = Math.sign || function(n) { return n >= 0 ? 1 : -1; }; var RANGE = { min: 0.2, max: 4 }, NUM_STEPS = 10; var DELTA_THRESHOLD = 0.1; var DEFAULT_SCALE = 0.75; /** * An implementation of zooming and scrolling within the * {@link Canvas} via the mouse wheel. * * Mouse wheel zooming / scrolling may be disabled using * the {@link toggle(enabled)} method. * * @param {Object} [config] * @param {Boolean} [config.enabled=true] default enabled state * @param {Number} [config.scale=.75] scroll sensivity * @param {EventBus} eventBus * @param {Canvas} canvas */ export default function ZoomScroll(config, eventBus, canvas) { config = config || {}; this._enabled = false; this._canvas = canvas; this._container = canvas._container; this._handleWheel = bind(this._handleWheel, this); this._totalDelta = 0; this._scale = config.scale || DEFAULT_SCALE; var self = this; eventBus.on('canvas.init', function(e) { self._init(config.enabled !== false); }); } ZoomScroll.$inject = [ 'config.zoomScroll', 'eventBus', 'canvas' ]; ZoomScroll.prototype.scroll = function scroll(delta) { this._canvas.scroll(delta); }; ZoomScroll.prototype.reset = function reset() { this._canvas.zoom('fit-viewport'); }; /** * Zoom depending on delta. * * @param {number} delta * @param {Object} position */ ZoomScroll.prototype.zoom = function zoom(delta, position) { // zoom with half the step size of stepZoom var stepSize = getStepSize(RANGE, NUM_STEPS * 2); // add until threshold reached this._totalDelta += delta; if (Math.abs(this._totalDelta) > DELTA_THRESHOLD) { this._zoom(delta, position, stepSize); // reset this._totalDelta = 0; } }; ZoomScroll.prototype._handleWheel = function handleWheel(event) { // event is already handled by '.djs-scrollable' if (domClosest(event.target, '.djs-scrollable', true)) { return; } var element = this._container; event.preventDefault(); // pinch to zoom is mapped to wheel + ctrlKey = true // in modern browsers (!) var isZoom = event.ctrlKey; var isHorizontalScroll = event.shiftKey; var factor = -1 * this._scale, delta; if (isZoom) { factor *= event.deltaMode === 0 ? 0.020 : 0.32; } else { factor *= event.deltaMode === 0 ? 1.0 : 16.0; } if (isZoom) { var elementRect = element.getBoundingClientRect(); var offset = { x: event.clientX - elementRect.left, y: event.clientY - elementRect.top }; delta = ( Math.sqrt( Math.pow(event.deltaY, 2) + Math.pow(event.deltaX, 2) ) * sign(event.deltaY) * factor ); // zoom in relative to diagram {x,y} coordinates this.zoom(delta, offset); } else { if (isHorizontalScroll) { delta = { dx: factor * event.deltaY, dy: 0 }; } else { delta = { dx: factor * event.deltaX, dy: factor * event.deltaY }; } this.scroll(delta); } }; /** * Zoom with fixed step size. * * @param {number} delta - Zoom delta (1 for zooming in, -1 for out). * @param {Object} position */ ZoomScroll.prototype.stepZoom = function stepZoom(delta, position) { var stepSize = getStepSize(RANGE, NUM_STEPS); this._zoom(delta, position, stepSize); }; /** * Zoom in/out given a step size. * * @param {number} delta * @param {Object} position * @param {number} stepSize */ ZoomScroll.prototype._zoom = function(delta, position, stepSize) { var canvas = this._canvas; var direction = delta > 0 ? 1 : -1; var currentLinearZoomLevel = log10(canvas.zoom()); // snap to a proximate zoom step var newLinearZoomLevel = Math.round(currentLinearZoomLevel / stepSize) * stepSize; // increase or decrease one zoom step in the given direction newLinearZoomLevel += stepSize * direction; // calculate the absolute logarithmic zoom level based on the linear zoom level // (e.g. 2 for an absolute x2 zoom) var newLogZoomLevel = Math.pow(10, newLinearZoomLevel); canvas.zoom(cap(RANGE, newLogZoomLevel), position); }; /** * Toggle the zoom scroll ability via mouse wheel. * * @param {Boolean} [newEnabled] new enabled state */ ZoomScroll.prototype.toggle = function toggle(newEnabled) { var element = this._container; var handleWheel = this._handleWheel; var oldEnabled = this._enabled; if (typeof newEnabled === 'undefined') { newEnabled = !oldEnabled; } // only react on actual changes if (oldEnabled !== newEnabled) { // add or remove wheel listener based on // changed enabled state domEvent[newEnabled ? 'bind' : 'unbind'](element, 'wheel', handleWheel, false); } this._enabled = newEnabled; return newEnabled; }; ZoomScroll.prototype._init = function(newEnabled) { this.toggle(newEnabled); }; |