114 lines
2.1 KiB
JavaScript
114 lines
2.1 KiB
JavaScript
/**
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* Move collapsed subprocesses into view when drilling down.
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*
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* Zoom and scroll are saved in a session.
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*
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* @param {eventBus} eventBus
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* @param {canvas} canvas
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*/
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export default function DrilldownCentering(eventBus, canvas) {
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var currentRoot = null;
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var positionMap = new Map();
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eventBus.on('root.set', function(event) {
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var currentViewbox = canvas.viewbox();
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positionMap.set(currentRoot, {
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x: currentViewbox.x,
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y: currentViewbox.y,
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zoom: currentViewbox.scale
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});
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var newRoot = event.element;
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var storedViewbox = positionMap.get(newRoot) || { x: 0, y: 0, zoom: 1 };
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var dx = (currentViewbox.x - storedViewbox.x) * currentViewbox.scale,
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dy = (currentViewbox.y - storedViewbox.y) * currentViewbox.scale;
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if (dx !== 0 || dy !== 0) {
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canvas.scroll({
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dx: dx,
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dy: dy
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});
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}
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if (storedViewbox.zoom !== currentViewbox.scale) {
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canvas.zoom(storedViewbox.zoom, { x: 0, y: 0 });
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}
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currentRoot = newRoot;
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});
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eventBus.on('root.remove', function(event) {
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positionMap.remove(event.element);
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});
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eventBus.on('diagram.clear', function() {
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positionMap.clear();
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currentRoot = null;
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});
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}
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DrilldownCentering.$inject = [ 'eventBus', 'canvas' ];
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/**
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* ES5 Map implementation. Works.
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*/
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function Map() {
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this._entries = [];
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this.set = function(key, value) {
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var found = false;
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for (var k in this._entries) {
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if (this._entries[k][0] === key) {
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this._entries[k][1] = value;
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found = true;
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break;
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}
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}
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if (!found) {
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this._entries.push([ key, value ]);
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}
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};
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this.get = function(key) {
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for (var k in this._entries) {
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if (this._entries[k][0] === key) {
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return this._entries[k][1];
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}
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}
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return null;
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};
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this.clear = function() {
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this._entries.length = 0;
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};
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this.remove = function(key) {
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var idx = -1;
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for (var k in this._entries) {
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if (this._entries[k][0] === key) {
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idx = k;
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break;
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}
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}
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if (idx !== -1) {
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this._entries.splice(idx, 1);
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}
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};
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} |