@antv/x6
Version:
JavaScript diagramming library that uses SVG and HTML for rendering.
149 lines • 6.49 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
import JQuery from 'jquery';
import { ModifierKey } from '../types';
import { Dom, NumberExt, Platform } from '../util';
import { Disposable } from '../common';
export class MouseWheel extends Disposable {
constructor(options) {
super();
this.options = options;
this.cumulatedFactor = 1;
const scroller = this.graph.scroller.widget;
this.container = scroller ? scroller.container : this.graph.container;
this.target = this.options.global ? document : this.container;
this.eventName = Platform.isEventSupported('wheel') ? 'wheel' : 'mousewheel';
this.handler = this.onMouseWheel.bind(this);
if (this.options.enabled) {
this.enable(true);
}
}
get graph() {
return this.options.graph;
}
get disabled() {
return this.options.enabled !== true;
}
enable(force) {
if (this.disabled || force) {
this.options.enabled = true;
this.graph.options.mousewheel.enabled = true;
if (Platform.SUPPORT_PASSIVE) {
this.target.addEventListener(this.eventName, this.handler, {
passive: false,
});
}
else {
JQuery(this.target).on('mousewheel', this.handler);
}
}
}
disable() {
if (!this.disabled) {
this.options.enabled = false;
this.graph.options.mousewheel.enabled = false;
if (Platform.SUPPORT_PASSIVE) {
this.target.removeEventListener(this.eventName, this.handler);
}
else {
JQuery(this.target).off('mousewheel');
}
}
}
onMouseWheel(evt) {
const e = (evt.originalEvent || evt);
const guard = this.options.guard;
if ((guard == null || guard.call(this.graph, e)) &&
ModifierKey.isMatch(e, this.options.modifiers)) {
evt.preventDefault();
evt.stopPropagation();
if (this.frameId) {
Dom.cancelAnimationFrame(this.frameId);
this.frameId = null;
}
const factor = this.options.factor || 1.2;
if (this.currentScale == null) {
this.startPos = { x: evt.clientX, y: evt.clientY };
this.currentScale = this.graph.scroller.widget
? this.graph.scroller.widget.zoom()
: this.graph.transform.getScale().sx;
}
const delta = evt.deltaY;
if (delta < 0) {
// zoomin
// ------
// Switches to 1% zoom steps below 15%
if (this.currentScale * this.cumulatedFactor < 0.15) {
this.cumulatedFactor = (this.currentScale + 0.01) / this.currentScale;
}
else {
// Uses to 5% zoom steps for better grid rendering in
// webkit and to avoid rounding errors for zoom steps
this.cumulatedFactor *= factor;
}
}
else {
// zoomout
// -------
// Switches to 1% zoom steps below 15%
if (this.currentScale * this.cumulatedFactor <= 0.15) {
this.cumulatedFactor = (this.currentScale - 0.01) / this.currentScale;
}
else {
// Uses to 5% zoom steps for better grid rendering in
// webkit and to avoid rounding errors for zoom steps
this.cumulatedFactor /= factor;
}
}
this.cumulatedFactor =
Math.round(this.currentScale * this.cumulatedFactor * 20) /
20 /
this.currentScale;
this.cumulatedFactor = Math.max(0.01, Math.min(this.currentScale * this.cumulatedFactor, 160) /
this.currentScale);
this.frameId = Dom.requestAnimationFrame(() => {
const scroller = this.graph.scroller.widget;
const currentScale = this.currentScale;
let targetScale = this.graph.transform.clampScale(currentScale * this.cumulatedFactor);
const minScale = this.options.minScale || Number.MIN_SAFE_INTEGER;
const maxScale = this.options.maxScale || Number.MAX_SAFE_INTEGER;
targetScale = NumberExt.clamp(targetScale, minScale, maxScale);
if (targetScale !== currentScale) {
if (scroller) {
if (this.options.zoomAtMousePosition) {
const origin = this.graph.coord.clientToLocalPoint(this.startPos);
scroller.zoom(targetScale, {
absolute: true,
center: origin.clone(),
});
}
else {
scroller.zoom(targetScale, { absolute: true });
}
}
else {
if (this.options.zoomAtMousePosition) {
const origin = this.graph.coord.clientToLocalPoint(this.startPos);
this.graph.translate(origin.x * (1 - targetScale), origin.y * (1 - targetScale));
}
this.graph.scale(targetScale, targetScale);
}
}
this.frameId = null;
this.currentScale = null;
this.cumulatedFactor = 1;
});
}
}
dispose() {
this.disable();
}
}
__decorate([
Disposable.dispose()
], MouseWheel.prototype, "dispose", null);
//# sourceMappingURL=mousewheel.js.map