ng-cw-v12
Version:
Angular UI component library
100 lines • 13.4 kB
JavaScript
import { Directive, Input, HostListener } from '@angular/core';
import * as i0 from "@angular/core";
export class ImgZoomDirective {
constructor(el, renderer) {
this.el = el;
this.renderer = renderer;
this.ncMinScale = 0.5;
this.ncMaxScale = 5;
this.ncObjectFit = 'contain';
this.scale = 1;
this.position = { x: 0, y: 0 };
this.isDragging = false;
this.lastPosition = { x: 0, y: 0 };
}
ngOnInit() {
this.initializeStyles();
}
initializeStyles() {
//设置父元素overflow:hidden。一方面是隐藏溢出,另一方面是当父元素是flex:1时(没有设置具体的width和height),img的object-fit才能生效
this.renderer.setStyle(this.renderer.parentNode(this.el.nativeElement), 'overflow', 'hidden');
this.renderer.setStyle(this.el.nativeElement, 'width', '100%');
this.renderer.setStyle(this.el.nativeElement, 'height', '100%');
this.renderer.setStyle(this.el.nativeElement, 'object-fit', this.ncObjectFit);
this.renderer.setStyle(this.el.nativeElement, 'transform-origin', 'center center');
this.renderer.setStyle(this.el.nativeElement, 'cursor', 'grab');
}
onWheel(event) {
event.preventDefault();
const delta = event.deltaY > 0 ? -0.1 : 0.1;
this.scale = Math.max(this.ncMinScale, Math.min(this.ncMaxScale, this.scale + delta));
this.updateTransform();
}
onMouseDown(event) {
event.preventDefault();
this.isDragging = true;
this.lastPosition = {
x: event.clientX - this.position.x,
y: event.clientY - this.position.y
};
// 在按下时立即更新cursor样式
this.renderer.setStyle(this.el.nativeElement, 'cursor', 'grabbing');
}
onMouseMove(event) {
if (!this.isDragging)
return;
this.position = {
x: event.clientX - this.lastPosition.x,
y: event.clientY - this.lastPosition.y
};
this.updateTransform();
}
onMouseUp() {
this.isDragging = false;
// 在释放时立即更新cursor样式
this.renderer.setStyle(this.el.nativeElement, 'cursor', 'grab');
}
onMouseLeave() {
this.isDragging = false;
this.renderer.setStyle(this.el.nativeElement, 'cursor', 'grab');
}
resetView() {
this.scale = 1;
this.position = { x: 0, y: 0 };
this.updateTransform();
}
updateTransform() {
this.renderer.setStyle(this.el.nativeElement, 'transform', `scale(${this.scale}) translate(${this.position.x}px, ${this.position.y}px)`);
}
}
ImgZoomDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.1.5", ngImport: i0, type: ImgZoomDirective, deps: [{ token: i0.ElementRef }, { token: i0.Renderer2 }], target: i0.ɵɵFactoryTarget.Directive });
ImgZoomDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "12.1.5", type: ImgZoomDirective, selector: "[ncImgZoom]", inputs: { ncMinScale: "ncMinScale", ncMaxScale: "ncMaxScale", ncObjectFit: "ncObjectFit" }, host: { listeners: { "wheel": "onWheel($event)", "mousedown": "onMouseDown($event)", "mousemove": "onMouseMove($event)", "mouseup": "onMouseUp($event)", "mouseleave": "onMouseLeave($event)" } }, exportAs: ["ncImgZoom"], ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.1.5", ngImport: i0, type: ImgZoomDirective, decorators: [{
type: Directive,
args: [{
selector: '[ncImgZoom]',
exportAs: 'ncImgZoom'
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.Renderer2 }]; }, propDecorators: { ncMinScale: [{
type: Input
}], ncMaxScale: [{
type: Input
}], ncObjectFit: [{
type: Input
}], onWheel: [{
type: HostListener,
args: ['wheel', ['$event']]
}], onMouseDown: [{
type: HostListener,
args: ['mousedown', ['$event']]
}], onMouseMove: [{
type: HostListener,
args: ['mousemove', ['$event']]
}], onMouseUp: [{
type: HostListener,
args: ['mouseup', ['$event']]
}], onMouseLeave: [{
type: HostListener,
args: ['mouseleave', ['$event']]
}] } });
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-0.1 : 0.1;\r\n\t\tthis.scale = Math.max(this.ncMinScale, Math.min(this.ncMaxScale, this.scale + delta));\r\n\t\tthis.updateTransform();\r\n\t}\r\n\r\n\t@HostListener('mousedown', ['$event'])\r\n\tprivate onMouseDown(event: MouseEvent) {\r\n\t\tevent.preventDefault();\r\n\t\tthis.isDragging = true;\r\n\t\tthis.lastPosition = {\r\n\t\t\tx: event.clientX - this.position.x,\r\n\t\t\ty: event.clientY - this.position.y\r\n\t\t};\r\n\t\t// 在按下时立即更新cursor样式\r\n\t\tthis.renderer.setStyle(this.el.nativeElement, 'cursor', 'grabbing');\r\n\t}\r\n\r\n\t@HostListener('mousemove', ['$event'])\r\n\tprivate onMouseMove(event: MouseEvent) {\r\n\t\tif (!this.isDragging) return;\r\n\r\n\t\tthis.position = {\r\n\t\t\tx: event.clientX - this.lastPosition.x,\r\n\t\t\ty: event.clientY - this.lastPosition.y\r\n\t\t};\r\n\t\tthis.updateTransform();\r\n\t}\r\n\r\n\t@HostListener('mouseup', ['$event'])\r\n\tprivate onMouseUp() {\r\n\t\tthis.isDragging = false;\r\n\t\t// 在释放时立即更新cursor样式\r\n\t\tthis.renderer.setStyle(this.el.nativeElement, 'cursor', 'grab');\r\n\t}\r\n\r\n\t@HostListener('mouseleave', ['$event'])\r\n\tprivate onMouseLeave() {\r\n\t\tthis.isDragging = false;\r\n\t\tthis.renderer.setStyle(this.el.nativeElement, 'cursor', 'grab');\r\n\t}\r\n\r\n\tresetView() {\r\n\t\tthis.scale = 1;\r\n\t\tthis.position = { x: 0, y: 0 };\r\n\t\tthis.updateTransform();\r\n\t}\r\n\r\n\tprivate updateTransform() {\r\n\t\tthis.renderer.setStyle(this.el.nativeElement, 'transform', `scale(${this.scale}) translate(${this.position.x}px, ${this.position.y}px)`);\r\n\t}\r\n}"]}