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