1 line
9 KiB
JavaScript
1 line
9 KiB
JavaScript
!function(){"use strict";!function(){class t{constructor(t){this.id=-1,this.nativePointer=t,this.pageX=t.pageX,this.pageY=t.pageY,this.clientX=t.clientX,this.clientY=t.clientY,self.Touch&&t instanceof Touch?this.id=t.identifier:e(t)&&(this.id=t.pointerId)}getCoalesced(){return"getCoalescedEvents"in this.nativePointer?this.nativePointer.getCoalescedEvents().map(e=>new t(e)):[this]}}const e=t=>self.PointerEvent&&t instanceof PointerEvent,n=()=>{};class i{constructor(t,e){this._element=t,this.startPointers=[],this.currentPointers=[];const{start:i=(()=>!0),move:s=n,end:r=n}=e;this._startCallback=i,this._moveCallback=s,this._endCallback=r,this._pointerStart=this._pointerStart.bind(this),this._touchStart=this._touchStart.bind(this),this._move=this._move.bind(this),this._triggerPointerEnd=this._triggerPointerEnd.bind(this),this._pointerEnd=this._pointerEnd.bind(this),this._touchEnd=this._touchEnd.bind(this),self.PointerEvent?this._element.addEventListener("pointerdown",this._pointerStart):(this._element.addEventListener("mousedown",this._pointerStart),this._element.addEventListener("touchstart",this._touchStart),this._element.addEventListener("touchmove",this._move),this._element.addEventListener("touchend",this._touchEnd))}_triggerPointerStart(t,e){return!!this._startCallback(t,e)&&(this.currentPointers.push(t),this.startPointers.push(t),!0)}_pointerStart(n){0===n.button&&this._triggerPointerStart(new t(n),n)&&(e(n)?(this._element.setPointerCapture(n.pointerId),this._element.addEventListener("pointermove",this._move),this._element.addEventListener("pointerup",this._pointerEnd)):(window.addEventListener("mousemove",this._move),window.addEventListener("mouseup",this._pointerEnd)))}_touchStart(e){for(const n of Array.from(e.changedTouches))this._triggerPointerStart(new t(n),e)}_move(e){const n=this.currentPointers.slice(),i="changedTouches"in e?Array.from(e.changedTouches).map(e=>new t(e)):[new t(e)],s=[];for(const t of i){const e=this.currentPointers.findIndex(e=>e.id===t.id);-1!==e&&(s.push(t),this.currentPointers[e]=t)}0!==s.length&&this._moveCallback(n,s,e)}_triggerPointerEnd(t,e){const n=this.currentPointers.findIndex(e=>e.id===t.id);return-1!==n&&(this.currentPointers.splice(n,1),this.startPointers.splice(n,1),this._endCallback(t,e),!0)}_pointerEnd(n){if(this._triggerPointerEnd(new t(n),n))if(e(n)){if(this.currentPointers.length)return;this._element.removeEventListener("pointermove",this._move),this._element.removeEventListener("pointerup",this._pointerEnd)}else window.removeEventListener("mousemove",this._move),window.removeEventListener("mouseup",this._pointerEnd)}_touchEnd(e){for(const n of Array.from(e.changedTouches))this._triggerPointerEnd(new t(n),e)}}!function(t,e){void 0===e&&(e={});var n=e.insertAt;if(t&&"undefined"!=typeof document){var i=document.head||document.getElementsByTagName("head")[0],s=document.createElement("style");s.type="text/css","top"===n&&i.firstChild?i.insertBefore(s,i.firstChild):i.appendChild(s),s.styleSheet?s.styleSheet.cssText=t:s.appendChild(document.createTextNode(t))}}("pinch-zoom {\n display: block;\n overflow: hidden;\n touch-action: none;\n --scale: 1;\n --x: 0;\n --y: 0;\n}\n\npinch-zoom > * {\n transform: translate(var(--x), var(--y)) scale(var(--scale));\n transform-origin: 0 0;\n will-change: transform;\n}\n");const s="min-scale",r="allow-pan-min-scale",o="reset-to-min-scale-limit",a="reach-min-scale-strategy",h="stop-propagate-handled",l="none";function c(t,e){return e?Math.sqrt((e.clientX-t.clientX)**2+(e.clientY-t.clientY)**2):0}function d(t,e){return e?{clientX:(t.clientX+e.clientX)/2,clientY:(t.clientY+e.clientY)/2}:t}function u(t,e){return"number"==typeof t?t:t.trimRight().endsWith("%")?e*parseFloat(t)/100:parseFloat(t)}let g;function p(){return g||(g=document.createElementNS("http://www.w3.org/2000/svg","svg"))}function m(){return p().createSVGMatrix()}function _(){return p().createSVGPoint()}const f=.01,v=-1,E=-1,P=(t,e)=>Math.round(100*t)-Math.round(100*e);class y extends HTMLElement{constructor(){super(),this._transform=m(),new MutationObserver(()=>this._stageElChange()).observe(this,{childList:!0});const t=new i(this,{start:(e,n)=>{if(2===t.currentPointers.length||!this._positioningEl)return!1;const i=t.currentPointers.length+1===1;return!(i&&!this._allowPan())&&(this._maybeStopPropagate(n),i||this._maybeEmitCancel([e,...t.currentPointers])),n.preventDefault(),!0},move:(e,n,i)=>{this._onPointerMove(e,t.currentPointers,i)},end:(e,n)=>{this._onPointerEnd(e,t.currentPointers,n)}});this.addEventListener("wheel",t=>this._onWheel(t))}static get observedAttributes(){return[s]}attributeChangedCallback(t,e,n){t===s&&this.scale<this.minScale&&this.setTransform({scale:this.minScale})}get minScale(){const t=this.getAttribute(s);if(!t)return f;const e=parseFloat(t);return Number.isFinite(e)?Math.max(f,e):f}set minScale(t){this.setAttribute(s,String(t))}get reachMinScaleStrategy(){return this.getAttribute(a)||l}set reachMinScaleStrategy(t){this.setAttribute(a,t)}get allowPanMinScale(){const t=this.getAttribute(r);if(!t)return v;const e=parseFloat(t);return Number.isFinite(e)?Math.max(v,e):v}set allowPanMinScale(t){this.setAttribute(r,String(t))}get resetToMinScaleLimit(){const t=this.getAttribute(o);if(!t)return E;const e=parseFloat(t);return Number.isFinite(e)?Math.max(E,e):E}set resetToMinScaleLimit(t){this.setAttribute(o,String(t))}get stopPropagateHandled(){return this.hasAttribute(h)}set stopPropagateHandled(t){t?this.setAttribute(h,""):this.removeAttribute(h)}connectedCallback(){this._stageElChange()}get x(){return this._transform.e}get y(){return this._transform.f}get scale(){return this._transform.a}scaleTo(t,e={}){let{originX:n=0,originY:i=0}=e;const{relativeTo:s="content",allowChangeEvent:r=!1}=e,o="content"===s?this._positioningEl:this;if(!o||!this._positioningEl)return void this.setTransform({scale:t,allowChangeEvent:r});const a=o.getBoundingClientRect();if(n=u(n,a.width),i=u(i,a.height),"content"===s)n+=this.x,i+=this.y;else{const t=this._positioningEl.getBoundingClientRect();n-=t.left,i-=t.top}this._applyChange({allowChangeEvent:r,originX:n,originY:i,scaleDiff:t/this.scale})}setTransform(t={}){const{scale:e=this.scale,allowChangeEvent:n=!1}=t;let{x:i=this.x,y:s=this.y}=t;if(!this._positioningEl)return void this._updateTransform(e,i,s,n);const r=this.getBoundingClientRect(),o=this._positioningEl.getBoundingClientRect();if(!r.width||!r.height)return void this._updateTransform(e,i,s,n);let a=_();a.x=o.left-r.left,a.y=o.top-r.top;let h=_();h.x=o.width+a.x,h.y=o.height+a.y;const l=m().translate(i,s).scale(e).multiply(this._transform.inverse());a=a.matrixTransform(l),h=h.matrixTransform(l),a.x>r.width?i+=r.width-a.x:h.x<0&&(i+=-h.x),a.y>r.height?s+=r.height-a.y:h.y<0&&(s+=-h.y),this._updateTransform(e,i,s,n)}_updateTransform(t,e,n,i){if(!(t<this.minScale)&&(t!==this.scale||e!==this.x||n!==this.y)&&(this._transform.e=e,this._transform.f=n,this._transform.d=this._transform.a=t,this.style.setProperty("--x",this.x+"px"),this.style.setProperty("--y",this.y+"px"),this.style.setProperty("--scale",this.scale+""),i)){const t=new Event("change",{bubbles:!0});this.dispatchEvent(t)}}_stageElChange(){this._positioningEl=void 0,0!==this.children.length&&(this._positioningEl=this.children[0],this.children.length>1&&console.warn("<pinch-zoom> must not have more than one child."),this.setTransform({allowChangeEvent:!0}))}_onWheel(t){if(!this._positioningEl)return;t.preventDefault();const e=this._positioningEl.getBoundingClientRect();let{deltaY:n}=t;const{ctrlKey:i,deltaMode:s}=t;1===s&&(n*=15);const r=1-n/(i?100:300),o=r<1;this._applyChange({scaleDiff:r,originX:t.clientX-e.left,originY:t.clientY-e.top,allowChangeEvent:!0}),o&&this._maybeResetScale()}_onPointerMove(t,e,n){if(!this._positioningEl)return;if(t.length<2&&!this._allowPan())return;const i=this._positioningEl.getBoundingClientRect(),s=d(t[0],t[1]),r=d(e[0],e[1]),o=s.clientX-i.left,a=s.clientY-i.top,h=c(t[0],t[1]),l=c(e[0],e[1]),u=h?l/h:1;this._applyChange({originX:o,originY:a,scaleDiff:u,panX:r.clientX-s.clientX,panY:r.clientY-s.clientY,allowChangeEvent:!0}),this._maybeStopPropagate(n)}_maybeResetScale(){P(this.scale,this.resetToMinScaleLimit)<=0&&this._resetToMinScale()}_onPointerEnd(t,e,n){if(!this._positioningEl)return;const i=1+e.length,s=1==i;i>=2&&this._maybeResetScale(),s&&!this._allowPan()||this._maybeStopPropagate(n)}_resetToMinScale(){"reset"===this.reachMinScaleStrategy?this.setTransform({scale:this.minScale,x:0,y:0}):this.setTransform({scale:this.minScale})}_applyChange(t={}){const{panX:e=0,panY:n=0,originX:i=0,originY:s=0,scaleDiff:r=1,allowChangeEvent:o=!1}=t,a=m().translate(e,n).translate(i,s).translate(this.x,this.y).scale(r).translate(-i,-s).scale(this.scale);this.setTransform({allowChangeEvent:o,scale:a.a,x:a.e,y:a.f})}_maybeStopPropagate(t){this.stopPropagateHandled&&t.stopPropagation()}_allowPan(){return this.allowPanMinScale>0&&P(this.scale,this.allowPanMinScale)>0}_maybeEmitCancel(t){this.stopPropagateHandled&&t.forEach(t=>{this.parentElement&&"function"==typeof this.parentElement.dispatchEvent&&this.parentElement.dispatchEvent((t=>new PointerEvent("pointercancel",{pointerId:t.id,clientX:t.clientX,clientY:t.clientY}))(t))})}}customElements.define("pinch-zoom",y)}()}();
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