Angular.js 实现带手柄自由调整页面大小的功能

因为目前是处于在angular项目中，所以下面分别一个记录简易的angular.js和在angular项目中使用的版本，仅供大家参考。

Angular.js

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Resizable Element with Angular Directive</title><style>.resizable {width: 200px;height: 200px;background-color: lightgray;border: 1px solid #ccc;overflow: auto;position: relative;}.resize-handle {width: 10px;height: 10px;background-color: #000;position: absolute;bottom: 0;right: 0;cursor: nwse-resize;}</style>
</head>
<body><div ng-app="resizableApp"><div ng-controller="ResizableController"><div resizable></div></div></div><script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js"></script><script>angular.module('resizableApp', []).controller('ResizableController', function($scope) {// 可以在这里添加控制器逻辑}).directive('resizable', function() {return {restrict: 'A',link: function(scope, element) {const resizableElement = element[0];const resizeHandle = document.createElement('div');resizeHandle.classList.add('resize-handle');resizableElement.appendChild(resizeHandle);let isResizing = false;let initialX;let initialY;let originalWidth;let originalHeight;resizeHandle.addEventListener('mousedown', function(event) {event.preventDefault();isResizing = true;initialX = event.clientX;initialY = event.clientY;originalWidth = parseFloat(getComputedStyle(resizableElement, null).getPropertyValue('width'));originalHeight = parseFloat(getComputedStyle(resizableElement, null).getPropertyValue('height'));document.addEventListener('mousemove', resize);document.addEventListener('mouseup', stopResize);});function resize(event) {if (isResizing) {const width = originalWidth + (event.clientX - initialX);const height = originalHeight + (event.clientY - initialY);resizableElement.style.width = width + 'px';resizableElement.style.height = height + 'px';}}function stopResize() {isResizing = false;document.removeEventListener('mousemove', resize);document.removeEventListener('mouseup', stopResize);}}};});</script>
</body>
</html>

在Angular项目中

在 Angular 项目中可以将上述功能作为 Angular 指令在组件中使用。

首先，创建一个名为 `resizable` 的自定义指令

import { Directive, ElementRef, HostListener } from '@angular/core';@Directive({selector: '[resizable]'
})
export class ResizableDirective {private isResizing = false;private initialX: number;private initialY: number;private originalWidth: number;private originalHeight: number;constructor(private elementRef: ElementRef) {}@HostListener('document:mousemove', ['$event'])onMouseMove(event: MouseEvent) {if (this.isResizing) {const width = this.originalWidth + (event.clientX - this.initialX);const height = this.originalHeight + (event.clientY - this.initialY);this.elementRef.nativeElement.style.width = width + 'px';this.elementRef.nativeElement.style.height = height + 'px';}}@HostListener('document:mouseup')onMouseUp() {this.isResizing = false;}@HostListener('mousedown', ['$event'])onMouseDown(event: MouseEvent) {event.preventDefault();this.isResizing = true;this.initialX = event.clientX;this.initialY = event.clientY;this.originalWidth = parseFloat(getComputedStyle(this.elementRef.nativeElement).getPropertyValue('width'));this.originalHeight = parseFloat(getComputedStyle(this.elementRef.nativeElement).getPropertyValue('height'));}
}

在组件模板中使用该指令

<div resizable class="resizable"></div>

最后，将 `ResizableDirective` 添加到您的 Angular 模块中

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ResizableDirective } from './resizable.directive';
import { AppComponent } from './app.component';@NgModule({declarations: [AppComponent,ResizableDirective],imports: [BrowserModule],providers: [],bootstrap: [AppComponent]
})
export class AppModule { }

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