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Commond_2.js
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63 lines (63 loc) · 1.95 KB
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/**
* Commond Pattern：invoker通过将行为委托给Commond，commond再委托给具体实现类。将Commond抽离出来方便历史管理，以及回退操作；
* 与Memonto相比，记录的是命令而不是snapshot，更加节省内存。
*/
var MakeBoldCommond = /** @class */ (function () {
function MakeBoldCommond(htmlEditor, history) {
this.htmlEditor = htmlEditor;
this.history = history;
}
MakeBoldCommond.prototype.excute = function () {
this.prevContent = this.htmlEditor.getContent();
this.htmlEditor.makeBold();
this.history.push(this);
};
MakeBoldCommond.prototype.unexcute = function () {
this.htmlEditor.setContent(this.prevContent);
};
return MakeBoldCommond;
}());
var UndoCommond = /** @class */ (function () {
function UndoCommond(history) {
this.history = history;
}
UndoCommond.prototype.excute = function () {
var last = this.history.pop();
last.unexcute();
};
return UndoCommond;
}());
var EditHistory = /** @class */ (function () {
function EditHistory() {
this.history = [];
}
EditHistory.prototype.push = function (commond) {
this.history.push(commond);
};
EditHistory.prototype.pop = function () {
return this.history.pop();
};
return EditHistory;
}());
var HtmlEditor = /** @class */ (function () {
function HtmlEditor() {
}
HtmlEditor.prototype.setContent = function (content) {
this.content = content;
};
HtmlEditor.prototype.getContent = function () {
return this.content;
};
HtmlEditor.prototype.makeBold = function () {
this.content = "<b>".concat(this.content, "<b/>");
};
return HtmlEditor;
}());
var editor = new HtmlEditor();
editor.setContent("hello world");
var h = new EditHistory();
var c = new MakeBoldCommond(editor, h);
c.excute();
var undo = new UndoCommond(h);
undo.excute();
console.log(editor.getContent());