接入画布

src/component/Canvas/CanvasEditor/commands/NonUndoableCommands.js

@@ -0,0 +1,103 @@
+/**
+ * 查询类命令示例 - 不需要撤销
+ */
+export class GetCanvasInfoCommand {
+  constructor(options) {
+    this.canvas = options.canvas;
+    this.layerManager = options.layerManager;
+    this.undoable = false; // 明确标记为不可撤销
+  }
+
+  execute() {
+    return {
+      width: this.canvas.getWidth(),
+      height: this.canvas.getHeight(),
+      zoom: this.canvas.getZoom(),
+      layers: this.layerManager?.getLayers()?.length || 0,
+      objects: this.canvas.getObjects().length,
+    };
+  }
+
+  // 查询类命令不需要实现 undo 方法
+}
+
+/**
+ * 导出类命令示例 - 不需要撤销
+ */
+export class ExportCanvasCommand {
+  constructor(options) {
+    this.canvas = options.canvas;
+    this.format = options.format || "png";
+    this.quality = options.quality || 1;
+    this.undoable = false;
+  }
+
+  execute() {
+    return this.canvas.toDataURL(`image/${this.format}`, this.quality);
+  }
+}
+
+/**
+ * 验证类命令示例 - 不需要撤销
+ */
+export class ValidateCanvasCommand {
+  constructor(options) {
+    this.canvas = options.canvas;
+    this.undoable = false;
+  }
+
+  execute() {
+    const objects = this.canvas.getObjects();
+    const errors = [];
+
+    objects.forEach((obj, index) => {
+      if (!obj.left || !obj.top) {
+        errors.push(`对象 ${index} 位置无效`);
+      }
+      if (obj.width <= 0 || obj.height <= 0) {
+        errors.push(`对象 ${index} 尺寸无效`);
+      }
+    });
+
+    return {
+      isValid: errors.length === 0,
+      errors,
+      objectCount: objects.length,
+    };
+  }
+}
+
+/**
+ * 系统清理命令示例 - 不可逆操作，不需要撤销
+ */
+export class CleanupTempDataCommand {
+  constructor(options) {
+    this.canvas = options.canvas;
+    this.undoable = false;
+  }
+
+  execute() {
+    // 清理临时数据
+    const cleaned = [];
+
+    // 移除无效对象
+    const objects = this.canvas.getObjects();
+    objects.forEach((obj, index) => {
+      if (obj._isTemp || obj._invalid) {
+        this.canvas.remove(obj);
+        cleaned.push(`临时对象 ${index}`);
+      }
+    });
+
+    // 清理缓存
+    if (this.canvas._clearCache) {
+      this.canvas._clearCache();
+      cleaned.push("画布缓存");
+    }
+
+    return {
+      cleaned,
+      count: cleaned.length,
+    };
+  }
+}