18xchat/assets/Scripts/chat18x/ui/uiTool/SpriteResize.ts

import {
  _decorator,
  Component,
  Sprite,
  UITransform,
  view,
  Size,
  isValid,
} from "cc";
import { logger } from "db://assets/Scripts/Main/Common/Logger";

const { ccclass } = _decorator;

/**
 * 精灵自动调整组件
 * 功能：使精灵保持原始宽高比并覆盖整个屏幕
 * 触发时机：GameObject 激活时、屏幕尺寸变化时
 */
@ccclass("SpriteResize")
export class SpriteResize extends Component {
  private sprite: Sprite = null;
  private uiTransform: UITransform = null;
  private lastScreenSize: Size = new Size();

  onLoad() {
    // 获取必要组件
    this.sprite = this.getComponent(Sprite);
    this.uiTransform = this.getComponent(UITransform);

    if (!this.sprite) {
      logger.warn("SpriteResize: 未找到 Sprite 组件");
      return;
    }

    if (!this.uiTransform) {
      logger.warn("SpriteResize: 未找到 UITransform 组件");
      return;
    }
  }

  onEnable() {
    // 激活时立即调整尺寸
    this.adjustSize();
  }

  /**
   * 调整精灵尺寸以覆盖整个屏幕
   * 保持原始宽高比，使用 cover 策略
   */
  private adjustSize() {
    if (!isValid(this.sprite) || !isValid(this.uiTransform)) {
      return;
    }

    const spriteFrame = this.sprite.spriteFrame;
    if (!spriteFrame) {
      return;
    }

    // 获取屏幕尺寸
    const screenSize = view.getVisibleSize();

    // 获取精灵原始尺寸
    const originalSize = spriteFrame.originalSize;
    if (!originalSize || originalSize.width <= 0 || originalSize.height <= 0) {
      return;
    }

    // 计算缩放比例（使用较大值以确保覆盖全屏）
    const scaleX = screenSize.width / originalSize.width;
    const scaleY = screenSize.height / originalSize.height;
    const scale = Math.max(scaleX, scaleY);

    // 计算新的尺寸
    const newWidth = originalSize.width * scale;
    const newHeight = originalSize.height * scale;

    // 应用新尺寸
    this.uiTransform.setContentSize(newWidth, newHeight);
  }

  /**
   * 手动触发尺寸调整
   * 可在外部调用，例如当 SpriteFrame 改变时
   */
  public forceResize() {
    this.adjustSize();
  }
}