@mapaxe/ngx-pinch-zoom
Version:
Pinch zoom component for Angular 16.
328 lines • 41.5 kB
JavaScript
export class Touches {
properties;
element;
elementPosition;
eventType = undefined;
handlers = {};
startX = 0;
startY = 0;
lastTap = 0;
doubleTapTimeout;
doubleTapMinTimeout = 300;
tapMinTimeout = 200;
touchstartTime = 0;
i = 0;
isMousedown = false;
_touchListeners = {
touchstart: 'handleTouchstart',
touchmove: 'handleTouchmove',
touchend: 'handleTouchend',
};
_mouseListeners = {
mousedown: 'handleMousedown',
mousemove: 'handleMousemove',
mouseup: 'handleMouseup',
wheel: 'handleWheel',
};
_otherListeners = {
resize: 'handleResize',
};
get touchListeners() {
return this.properties.touchListeners ? this.properties.touchListeners : this._touchListeners;
}
get mouseListeners() {
return this.properties.mouseListeners ? this.properties.mouseListeners : this._mouseListeners;
}
get otherListeners() {
return this.properties.otherListeners ? this.properties.otherListeners : this._otherListeners;
}
constructor(properties) {
this.properties = properties;
this.element = this.properties.element;
this.elementPosition = this.getElementPosition();
this.toggleEventListeners('addEventListener');
}
destroy() {
this.toggleEventListeners('removeEventListener');
}
toggleEventListeners(action) {
let listeners;
if (this.properties.listeners === 'mouse and touch') {
listeners = Object.assign(this.touchListeners, this.mouseListeners);
}
else {
listeners = this.detectTouchScreen() ? this.touchListeners : this.mouseListeners;
}
if (this.properties.resize) {
listeners = Object.assign(listeners, this.otherListeners);
}
for (var listener in listeners) {
const handler = listeners[listener];
// Window
if (listener === 'resize') {
if (action === 'addEventListener') {
window.addEventListener(listener, this[handler], false);
}
if (action === 'removeEventListener') {
window.removeEventListener(listener, this[handler], false);
}
// Document
}
else if (listener === 'mouseup' || listener === 'mousemove') {
if (action === 'addEventListener') {
document.addEventListener(listener, this[handler], false);
}
if (action === 'removeEventListener') {
document.removeEventListener(listener, this[handler], false);
}
// Element
}
else {
if (action === 'addEventListener') {
this.element.addEventListener(listener, this[handler], false);
}
if (action === 'removeEventListener') {
this.element.removeEventListener(listener, this[handler], false);
}
}
}
}
addEventListeners(listener) {
const handler = this._mouseListeners[listener];
window.addEventListener(listener, this[handler], false);
}
removeEventListeners(listener) {
const handler = this._mouseListeners[listener];
window.removeEventListener(listener, this[handler], false);
}
/*
* Listeners
*/
/* Touchstart */
handleTouchstart = (event) => {
this.elementPosition = this.getElementPosition();
this.touchstartTime = new Date().getTime();
if (this.eventType === undefined) {
this.getTouchstartPosition(event);
}
this.runHandler('touchstart', event);
};
/* Touchmove */
handleTouchmove = (event) => {
const touches = event.touches;
// Pan
if (this.detectPan(touches)) {
this.runHandler('pan', event);
}
// Pinch
if (this.detectPinch(event)) {
this.runHandler('pinch', event);
}
};
handleLinearSwipe(event) {
//event.preventDefault();
this.i++;
if (this.i > 3) {
this.eventType = this.getLinearSwipeType(event);
}
if (this.eventType === 'horizontal-swipe') {
this.runHandler('horizontal-swipe', event);
}
if (this.eventType === 'vertical-swipe') {
this.runHandler('vertical-swipe', event);
}
}
/* Touchend */
handleTouchend = (event) => {
const touches = event.touches;
// Double Tap
if (this.detectDoubleTap()) {
this.runHandler('double-tap', event);
}
// Tap
this.detectTap();
this.runHandler('touchend', event);
this.eventType = 'touchend';
if (touches && touches.length === 0) {
this.eventType = undefined;
this.i = 0;
}
};
/* Mousedown */
handleMousedown = (event) => {
this.isMousedown = true;
this.elementPosition = this.getElementPosition();
this.touchstartTime = new Date().getTime();
if (this.eventType === undefined) {
this.getMousedownPosition(event);
}
this.runHandler('mousedown', event);
};
/* Mousemove */
handleMousemove = (event) => {
//event.preventDefault();
if (!this.isMousedown) {
return;
}
// Pan
this.runHandler('pan', event);
// Linear swipe
switch (this.detectLinearSwipe(event)) {
case 'horizontal-swipe':
event.swipeType = 'horizontal-swipe';
this.runHandler('horizontal-swipe', event);
break;
case 'vertical-swipe':
event.swipeType = 'vertical-swipe';
this.runHandler('vertical-swipe', event);
break;
}
// Linear swipe
if (this.detectLinearSwipe(event) || this.eventType === 'horizontal-swipe' || this.eventType === 'vertical-swipe') {
this.handleLinearSwipe(event);
}
};
/* Mouseup */
handleMouseup = (event) => {
// Tap
this.detectTap();
this.isMousedown = false;
this.runHandler('mouseup', event);
this.eventType = undefined;
this.i = 0;
};
/* Wheel */
handleWheel = (event) => {
this.runHandler('wheel', event);
};
/* Resize */
handleResize = (event) => {
this.runHandler('resize', event);
};
runHandler(eventName, response) {
if (this.handlers[eventName]) {
this.handlers[eventName](response);
}
}
/*
* Detection
*/
detectPan(touches) {
return (touches.length === 1 && !this.eventType) || this.eventType === 'pan';
}
detectDoubleTap() {
if (this.eventType != undefined) {
return;
}
const currentTime = new Date().getTime();
const tapLength = currentTime - this.lastTap;
clearTimeout(this.doubleTapTimeout);
if (tapLength < this.doubleTapMinTimeout && tapLength > 0) {
return true;
}
else {
this.doubleTapTimeout = setTimeout(() => {
clearTimeout(this.doubleTapTimeout);
}, this.doubleTapMinTimeout);
}
this.lastTap = currentTime;
return undefined;
}
detectTap() {
if (this.eventType != undefined) {
return;
}
const currentTime = new Date().getTime();
const tapLength = currentTime - this.touchstartTime;
if (tapLength > 0) {
if (tapLength < this.tapMinTimeout) {
this.runHandler('tap', {});
}
else {
this.runHandler('longtap', {});
}
}
}
detectPinch(event) {
const touches = event.touches;
return (touches.length === 2 && this.eventType === undefined) || this.eventType === 'pinch';
}
detectLinearSwipe(event) {
const touches = event.touches;
if (touches) {
if ((touches.length === 1 && !this.eventType) || this.eventType === 'horizontal-swipe' || this.eventType === 'vertical-swipe') {
return this.getLinearSwipeType(event);
}
}
else {
if (!this.eventType || this.eventType === 'horizontal-swipe' || this.eventType === 'vertical-swipe') {
return this.getLinearSwipeType(event);
}
}
return undefined;
}
getLinearSwipeType(event) {
if (this.eventType !== 'horizontal-swipe' && this.eventType !== 'vertical-swipe') {
const movementX = Math.abs(this.moveLeft(0, event) - this.startX);
const movementY = Math.abs(this.moveTop(0, event) - this.startY);
if (movementY * 3 > movementX) {
return 'vertical-swipe';
}
else {
return 'horizontal-swipe';
}
}
else {
return this.eventType;
}
}
getElementPosition() {
return this.element.getBoundingClientRect();
}
getTouchstartPosition(event) {
this.startX = event.touches[0].clientX - this.elementPosition.left;
this.startY = event.touches[0].clientY - this.elementPosition.top;
}
getMousedownPosition(event) {
this.startX = event.clientX - this.elementPosition.left;
this.startY = event.clientY - this.elementPosition.top;
}
moveLeft(index, event) {
const touches = event.touches;
if (touches) {
return touches[index].clientX - this.elementPosition.left;
}
else {
return event.clientX - this.elementPosition.left;
}
}
moveTop(index, event) {
const touches = event.touches;
if (touches) {
return touches[index].clientY - this.elementPosition.top;
}
else {
return event.clientY - this.elementPosition.top;
}
}
detectTouchScreen() {
var prefixes = ' -webkit- -moz- -o- -ms- '.split(' ');
var mq = function (query) {
return window.matchMedia(query).matches;
};
if ('ontouchstart' in window) {
return true;
}
// include the 'heartz' as a way to have a non matching MQ to help terminate the join
// https://git.io/vznFH
var query = ['(', prefixes.join('touch-enabled),('), 'heartz', ')'].join('');
return mq(query);
}
/* Public properties and methods */
on(event, handler) {
if (event) {
this.handlers[event] = handler;
}
}
}
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interface Properties {\r\n    element: HTMLElement;\r\n    listeners?: 'auto' | 'mouse and touch';\r\n    touchListeners?: any;\r\n    mouseListeners?: any;\r\n    otherListeners?: any;\r\n    resize?: boolean;\r\n}\r\n\r\nexport type EventType = undefined | 'touchend' | 'pan' | 'pinch' | 'horizontal-swipe' | 'vertical-swipe' | 'tap' | 'longtap';\r\nexport type TouchHandler = 'handleTouchstart' | 'handleTouchmove' | 'handleTouchend';\r\nexport type MouseHandler = 'handleMousedown' | 'handleMousemove' | 'handleMouseup';\r\n\r\nexport class Touches {\r\n    properties: Properties;\r\n    element: HTMLElement;\r\n    elementPosition: ClientRect;\r\n    eventType: EventType = undefined;\r\n    handlers: any = {};\r\n    startX = 0;\r\n    startY = 0;\r\n    lastTap = 0;\r\n    doubleTapTimeout: any;\r\n    doubleTapMinTimeout = 300;\r\n    tapMinTimeout = 200;\r\n    touchstartTime = 0;\r\n    i: number = 0;\r\n    isMousedown = false;\r\n\r\n    _touchListeners: any = {\r\n        touchstart: 'handleTouchstart',\r\n        touchmove: 'handleTouchmove',\r\n        touchend: 'handleTouchend',\r\n    };\r\n    _mouseListeners: any = {\r\n        mousedown: 'handleMousedown',\r\n        mousemove: 'handleMousemove',\r\n        mouseup: 'handleMouseup',\r\n        wheel: 'handleWheel',\r\n    };\r\n    _otherListeners: any = {\r\n        resize: 'handleResize',\r\n    };\r\n\r\n    get touchListeners() {\r\n        return this.properties.touchListeners ? this.properties.touchListeners : this._touchListeners;\r\n    }\r\n\r\n    get mouseListeners() {\r\n        return this.properties.mouseListeners ? this.properties.mouseListeners : this._mouseListeners;\r\n    }\r\n\r\n    get otherListeners() {\r\n        return this.properties.otherListeners ? this.properties.otherListeners : this._otherListeners;\r\n    }\r\n\r\n    constructor(properties: Properties) {\r\n        this.properties = properties;\r\n        this.element = this.properties.element;\r\n        this.elementPosition = this.getElementPosition();\r\n\r\n        this.toggleEventListeners('addEventListener');\r\n    }\r\n\r\n    destroy() {\r\n        this.toggleEventListeners('removeEventListener');\r\n    }\r\n\r\n    toggleEventListeners(action: 'addEventListener' | 'removeEventListener') {\r\n        let listeners;\r\n\r\n        if (this.properties.listeners === 'mouse and touch') {\r\n            listeners = Object.assign(this.touchListeners, this.mouseListeners);\r\n        } else {\r\n            listeners = this.detectTouchScreen() ? this.touchListeners : this.mouseListeners;\r\n        }\r\n\r\n        if (this.properties.resize) {\r\n            listeners = Object.assign(listeners, this.otherListeners);\r\n        }\r\n\r\n        for (var listener in listeners) {\r\n            const handler: MouseHandler = listeners[listener];\r\n\r\n            // Window\r\n            if (listener === 'resize') {\r\n                if (action === 'addEventListener') {\r\n                    window.addEventListener(listener, this[handler], false);\r\n                }\r\n                if (action === 'removeEventListener') {\r\n                    window.removeEventListener(listener, this[handler], false);\r\n                }\r\n                // Document\r\n            } else if (listener === 'mouseup' || listener === 'mousemove') {\r\n                if (action === 'addEventListener') {\r\n                    document.addEventListener(listener, this[handler], false);\r\n                }\r\n                if (action === 'removeEventListener') {\r\n                    document.removeEventListener(listener, this[handler], false);\r\n                }\r\n                // Element\r\n            } else {\r\n                if (action === 'addEventListener') {\r\n                    this.element.addEventListener(listener, this[handler], false);\r\n                }\r\n                if (action === 'removeEventListener') {\r\n                    this.element.removeEventListener(listener, this[handler], false);\r\n                }\r\n            }\r\n        }\r\n    }\r\n\r\n    addEventListeners(listener: string) {\r\n        const handler: MouseHandler = this._mouseListeners[listener];\r\n        window.addEventListener(listener, this[handler], false);\r\n    }\r\n\r\n    removeEventListeners(listener: string) {\r\n        const handler: MouseHandler = this._mouseListeners[listener];\r\n        window.removeEventListener(listener, this[handler], false);\r\n    }\r\n\r\n    /*\r\n     * Listeners\r\n     */\r\n\r\n    /* Touchstart */\r\n\r\n    handleTouchstart = (event: any) => {\r\n        this.elementPosition = this.getElementPosition();\r\n        this.touchstartTime = new Date().getTime();\r\n\r\n        if (this.eventType === undefined) {\r\n            this.getTouchstartPosition(event);\r\n        }\r\n\r\n        this.runHandler('touchstart', event);\r\n    };\r\n\r\n    /* Touchmove */\r\n\r\n    handleTouchmove = (event: any) => {\r\n        const touches = event.touches;\r\n\r\n        // Pan\r\n        if (this.detectPan(touches)) {\r\n            this.runHandler('pan', event);\r\n        }\r\n\r\n        // Pinch\r\n        if (this.detectPinch(event)) {\r\n            this.runHandler('pinch', event);\r\n        }\r\n    };\r\n\r\n    handleLinearSwipe(event: any) {\r\n        //event.preventDefault();\r\n\r\n        this.i++;\r\n\r\n        if (this.i > 3) {\r\n            this.eventType = this.getLinearSwipeType(event);\r\n        }\r\n\r\n        if (this.eventType === 'horizontal-swipe') {\r\n            this.runHandler('horizontal-swipe', event);\r\n        }\r\n\r\n        if (this.eventType === 'vertical-swipe') {\r\n            this.runHandler('vertical-swipe', event);\r\n        }\r\n    }\r\n\r\n    /* Touchend */\r\n\r\n    handleTouchend = (event: any) => {\r\n        const touches = event.touches;\r\n\r\n        // Double Tap\r\n        if (this.detectDoubleTap()) {\r\n            this.runHandler('double-tap', event);\r\n        }\r\n\r\n        // Tap\r\n        this.detectTap();\r\n\r\n        this.runHandler('touchend', event);\r\n        this.eventType = 'touchend';\r\n\r\n        if (touches && touches.length === 0) {\r\n            this.eventType = undefined;\r\n            this.i = 0;\r\n        }\r\n    };\r\n\r\n    /* Mousedown */\r\n\r\n    handleMousedown = (event: any) => {\r\n        this.isMousedown = true;\r\n        this.elementPosition = this.getElementPosition();\r\n        this.touchstartTime = new Date().getTime();\r\n\r\n        if (this.eventType === undefined) {\r\n            this.getMousedownPosition(event);\r\n        }\r\n\r\n        this.runHandler('mousedown', event);\r\n    };\r\n\r\n    /* Mousemove */\r\n\r\n    handleMousemove = (event: any) => {\r\n        //event.preventDefault();\r\n\r\n        if (!this.isMousedown) {\r\n            return;\r\n        }\r\n\r\n        // Pan\r\n        this.runHandler('pan', event);\r\n\r\n        // Linear swipe\r\n        switch (this.detectLinearSwipe(event)) {\r\n            case 'horizontal-swipe':\r\n                event.swipeType = 'horizontal-swipe';\r\n                this.runHandler('horizontal-swipe', event);\r\n                break;\r\n            case 'vertical-swipe':\r\n                event.swipeType = 'vertical-swipe';\r\n                this.runHandler('vertical-swipe', event);\r\n                break;\r\n        }\r\n\r\n        // Linear swipe\r\n        if (this.detectLinearSwipe(event) || this.eventType === 'horizontal-swipe' || this.eventType === 'vertical-swipe') {\r\n            this.handleLinearSwipe(event);\r\n        }\r\n    };\r\n\r\n    /* Mouseup */\r\n\r\n    handleMouseup = (event: any) => {\r\n        // Tap\r\n        this.detectTap();\r\n\r\n        this.isMousedown = false;\r\n        this.runHandler('mouseup', event);\r\n        this.eventType = undefined;\r\n        this.i = 0;\r\n    };\r\n\r\n    /* Wheel */\r\n\r\n    handleWheel = (event: any) => {\r\n        this.runHandler('wheel', event);\r\n    };\r\n\r\n    /* Resize */\r\n\r\n    handleResize = (event: any) => {\r\n        this.runHandler('resize', event);\r\n    };\r\n\r\n    runHandler(eventName: any, response: any) {\r\n        if (this.handlers[eventName]) {\r\n            this.handlers[eventName](response);\r\n        }\r\n    }\r\n\r\n    /*\r\n     * Detection\r\n     */\r\n\r\n    detectPan(touches: any) {\r\n        return (touches.length === 1 && !this.eventType) || this.eventType === 'pan';\r\n    }\r\n\r\n    detectDoubleTap() {\r\n        if (this.eventType != undefined) {\r\n            return;\r\n        }\r\n\r\n        const currentTime = new Date().getTime();\r\n        const tapLength = currentTime - this.lastTap;\r\n\r\n        clearTimeout(this.doubleTapTimeout);\r\n\r\n        if (tapLength < this.doubleTapMinTimeout && tapLength > 0) {\r\n            return true;\r\n        } else {\r\n            this.doubleTapTimeout = setTimeout(() => {\r\n                clearTimeout(this.doubleTapTimeout);\r\n            }, this.doubleTapMinTimeout);\r\n        }\r\n        this.lastTap = currentTime;\r\n\r\n        return undefined;\r\n    }\r\n\r\n    detectTap(): void {\r\n        if (this.eventType != undefined) {\r\n            return;\r\n        }\r\n\r\n        const currentTime = new Date().getTime();\r\n        const tapLength = currentTime - this.touchstartTime;\r\n\r\n        if (tapLength > 0) {\r\n            if (tapLength < this.tapMinTimeout) {\r\n                this.runHandler('tap', {});\r\n            } else {\r\n                this.runHandler('longtap', {});\r\n            }\r\n        }\r\n    }\r\n\r\n    detectPinch(event: any) {\r\n        const touches = event.touches;\r\n        return (touches.length === 2 && this.eventType === undefined) || this.eventType === 'pinch';\r\n    }\r\n\r\n    detectLinearSwipe(event: any) {\r\n        const touches = event.touches;\r\n\r\n        if (touches) {\r\n            if ((touches.length === 1 && !this.eventType) || this.eventType === 'horizontal-swipe' || this.eventType === 'vertical-swipe') {\r\n                return this.getLinearSwipeType(event);\r\n            }\r\n        } else {\r\n            if (!this.eventType || this.eventType === 'horizontal-swipe' || this.eventType === 'vertical-swipe') {\r\n                return this.getLinearSwipeType(event);\r\n            }\r\n        }\r\n\r\n        return undefined;\r\n    }\r\n\r\n    getLinearSwipeType(event: any) {\r\n        if (this.eventType !== 'horizontal-swipe' && this.eventType !== 'vertical-swipe') {\r\n            const movementX = Math.abs(this.moveLeft(0, event) - this.startX);\r\n            const movementY = Math.abs(this.moveTop(0, event) - this.startY);\r\n\r\n            if (movementY * 3 > movementX) {\r\n                return 'vertical-swipe';\r\n            } else {\r\n                return 'horizontal-swipe';\r\n            }\r\n        } else {\r\n            return this.eventType;\r\n        }\r\n    }\r\n\r\n    getElementPosition() {\r\n        return this.element.getBoundingClientRect();\r\n    }\r\n\r\n    getTouchstartPosition(event: any) {\r\n        this.startX = event.touches[0].clientX - this.elementPosition.left;\r\n        this.startY = event.touches[0].clientY - this.elementPosition.top;\r\n    }\r\n\r\n    getMousedownPosition(event: any) {\r\n        this.startX = event.clientX - this.elementPosition.left;\r\n        this.startY = event.clientY - this.elementPosition.top;\r\n    }\r\n\r\n    moveLeft(index: any, event: any) {\r\n        const touches = event.touches;\r\n\r\n        if (touches) {\r\n            return touches[index].clientX - this.elementPosition.left;\r\n        } else {\r\n            return event.clientX - this.elementPosition.left;\r\n        }\r\n    }\r\n\r\n    moveTop(index: any, event: any) {\r\n        const touches = event.touches;\r\n\r\n        if (touches) {\r\n            return touches[index].clientY - this.elementPosition.top;\r\n        } else {\r\n            return event.clientY - this.elementPosition.top;\r\n        }\r\n    }\r\n\r\n    detectTouchScreen() {\r\n        var prefixes = ' -webkit- -moz- -o- -ms- '.split(' ');\r\n        var mq = function (query: any) {\r\n            return window.matchMedia(query).matches;\r\n        };\r\n\r\n        if ('ontouchstart' in window) {\r\n            return true;\r\n        }\r\n\r\n        // include the 'heartz' as a way to have a non matching MQ to help terminate the join\r\n        // https://git.io/vznFH\r\n        var query = ['(', prefixes.join('touch-enabled),('), 'heartz', ')'].join('');\r\n        return mq(query);\r\n    }\r\n\r\n    /* Public properties and methods */\r\n    on(event: EventType, handler: Function) {\r\n        if (event) {\r\n            this.handlers[event] = handler;\r\n        }\r\n    }\r\n}\r\n"]}