Xiaohan-Tian
46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
/**
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* Base command interface for the command pattern implementation
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* All undoable operations in KGSP should extend this class
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*/
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export abstract class KGCommand {
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/**
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* Execute the command (perform the operation)
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*/
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abstract execute(): void;
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/**
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* Undo the command (reverse the operation)
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*/
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abstract undo(): void;
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/**
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* Get a human-readable description of what the command does
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* Used for UI feedback and debugging
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*/
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abstract getDescription(): string;
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/**
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* Check if this command can be merged with another command
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* Used for continuous operations like dragging or resizing
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* @param other The other command to potentially merge with
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*/
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canMergeWith(other: KGCommand): boolean {
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return false; // Default: commands cannot be merged
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}
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/**
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* Merge this command with another command
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* Only called if canMergeWith returns true
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* @param other The other command to merge with
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* @returns A new merged command, or null if merge fails
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*/
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mergeWith(other: KGCommand): KGCommand | null {
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return null; // Default: no merging implemented
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}
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/**
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* Get the timestamp when this command was created
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* Used for command history management
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*/
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public readonly timestamp: number = Date.now();
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} |