Created
December 11, 2019 07:45
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Save connecttobn/cf97889d8d69a944780314a217981965 to your computer and use it in GitHub Desktop.
JS Bin // source https://jsbin.com/hilefat
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <script id="jsbin-javascript"> | |
| var UndoAPI = function(updateService){ | |
| this._ll = []; | |
| this._re = updateService; | |
| this._curr = -1; | |
| this._max =5; | |
| } | |
| UndoAPI.prototype = { | |
| canRedo: function(){ | |
| var l = this._ll.length | |
| return ( l !== 0 && this._curr !== l-1); | |
| }, | |
| canUndo:function(){ | |
| var l = this._ll.length | |
| return ( l !== 0 && this._curr !== -1); | |
| }, | |
| register:function(data){ | |
| if(this._max == this._ll.length) | |
| this._ll.shift();//remove oldest item | |
| this._ll.push(data); | |
| this._curr = this._ll.length-1; | |
| return this._re(data); | |
| }, | |
| undo:function(){ | |
| if(this.canUndo()){ | |
| this._curr--; | |
| this._re(this._ll[this._curr]); | |
| } | |
| else | |
| console.log("Can't UNDO"); | |
| }, | |
| redo:function(){ | |
| if(this.canRedo()){ | |
| this._curr++; | |
| this._re(this._ll[this._curr]); | |
| }else | |
| console.log("Can't REDO"); | |
| }, | |
| clear: function(){ | |
| this._ll = [] | |
| this._curr =-1; | |
| } | |
| }; | |
| var print = function(d){ | |
| console.log("Current state:" + d.toString()); | |
| } | |
| var tasksAPI = new UndoAPI(print) | |
| tasksAPI.register(["a"]); | |
| tasksAPI.register(["a", "b"]); | |
| console.log("Can redo: "+tasksAPI.canRedo()); | |
| console.log("Can undo: "+tasksAPI.canUndo()); | |
| tasksAPI.register(["a", "b", "c"]); | |
| tasksAPI.register(["a", "b", "c","d"]); | |
| tasksAPI.undo(); | |
| tasksAPI.redo(); | |
| tasksAPI.register(["a", "b", "c","d", "e"]); | |
| tasksAPI.register(["a", "b", "c","d", "e", "f"]); | |
| tasksAPI.undo(); | |
| </script> | |
| <script id="jsbin-source-javascript" type="text/javascript">var UndoAPI = function(updateService){ | |
| this._ll = []; | |
| this._re = updateService; | |
| this._curr = -1; | |
| this._max =5; | |
| } | |
| UndoAPI.prototype = { | |
| canRedo: function(){ | |
| var l = this._ll.length | |
| return ( l !== 0 && this._curr !== l-1); | |
| }, | |
| canUndo:function(){ | |
| var l = this._ll.length | |
| return ( l !== 0 && this._curr !== -1); | |
| }, | |
| register:function(data){ | |
| if(this._max == this._ll.length) | |
| this._ll.shift();//remove oldest item | |
| this._ll.push(data); | |
| this._curr = this._ll.length-1; | |
| return this._re(data); | |
| }, | |
| undo:function(){ | |
| if(this.canUndo()){ | |
| this._curr--; | |
| this._re(this._ll[this._curr]); | |
| } | |
| else | |
| console.log("Can't UNDO"); | |
| }, | |
| redo:function(){ | |
| if(this.canRedo()){ | |
| this._curr++; | |
| this._re(this._ll[this._curr]); | |
| }else | |
| console.log("Can't REDO"); | |
| }, | |
| clear: function(){ | |
| this._ll = [] | |
| this._curr =-1; | |
| } | |
| }; | |
| var print = function(d){ | |
| console.log("Current state:" + d.toString()); | |
| } | |
| var tasksAPI = new UndoAPI(print) | |
| tasksAPI.register(["a"]); | |
| tasksAPI.register(["a", "b"]); | |
| console.log("Can redo: "+tasksAPI.canRedo()); | |
| console.log("Can undo: "+tasksAPI.canUndo()); | |
| tasksAPI.register(["a", "b", "c"]); | |
| tasksAPI.register(["a", "b", "c","d"]); | |
| tasksAPI.undo(); | |
| tasksAPI.redo(); | |
| tasksAPI.register(["a", "b", "c","d", "e"]); | |
| tasksAPI.register(["a", "b", "c","d", "e", "f"]); | |
| tasksAPI.undo(); | |
| </script></body> | |
| </html> |
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| var UndoAPI = function(updateService){ | |
| this._ll = []; | |
| this._re = updateService; | |
| this._curr = -1; | |
| this._max =5; | |
| } | |
| UndoAPI.prototype = { | |
| canRedo: function(){ | |
| var l = this._ll.length | |
| return ( l !== 0 && this._curr !== l-1); | |
| }, | |
| canUndo:function(){ | |
| var l = this._ll.length | |
| return ( l !== 0 && this._curr !== -1); | |
| }, | |
| register:function(data){ | |
| if(this._max == this._ll.length) | |
| this._ll.shift();//remove oldest item | |
| this._ll.push(data); | |
| this._curr = this._ll.length-1; | |
| return this._re(data); | |
| }, | |
| undo:function(){ | |
| if(this.canUndo()){ | |
| this._curr--; | |
| this._re(this._ll[this._curr]); | |
| } | |
| else | |
| console.log("Can't UNDO"); | |
| }, | |
| redo:function(){ | |
| if(this.canRedo()){ | |
| this._curr++; | |
| this._re(this._ll[this._curr]); | |
| }else | |
| console.log("Can't REDO"); | |
| }, | |
| clear: function(){ | |
| this._ll = [] | |
| this._curr =-1; | |
| } | |
| }; | |
| var print = function(d){ | |
| console.log("Current state:" + d.toString()); | |
| } | |
| var tasksAPI = new UndoAPI(print) | |
| tasksAPI.register(["a"]); | |
| tasksAPI.register(["a", "b"]); | |
| console.log("Can redo: "+tasksAPI.canRedo()); | |
| console.log("Can undo: "+tasksAPI.canUndo()); | |
| tasksAPI.register(["a", "b", "c"]); | |
| tasksAPI.register(["a", "b", "c","d"]); | |
| tasksAPI.undo(); | |
| tasksAPI.redo(); | |
| tasksAPI.register(["a", "b", "c","d", "e"]); | |
| tasksAPI.register(["a", "b", "c","d", "e", "f"]); | |
| tasksAPI.undo(); |
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