实施撤消 [英] Implementing undo
问题描述
我正在创建一个地图编辑Web应用程序，我们可以在其中创建和编辑折线，多边形等.我在查找有关Web上撤消实施的信息时遇到了一些麻烦，我对我们需要撤消"产生了抱怨.和这是我的使用闭包的命令模式"但我认为在这和完整的撤消/重做界面之间，还有相当长的路要走.
I'm creating a map editing webapp where we can create and edit polylines, polygons etc. I've some trouble finding informations on undo implementation on the web, I find whining about "we need undo" and "here is my Command pattern using closures" but I think between that and a full undo/redo interface there is quite some road.
所以，这是我的问题(我认为是Wiki的不错的候选人):
So, here are my questions (good candidate for wiki I think):
- 我应该管理堆栈，还是可以将命令发送到浏览器的堆栈?(以及如何处理本机命令，例如在这种情况下在textifields中进行文本编辑)
- 我该如何处理命令压缩"?(命令分组)，当某些命令是浏览器本地的
- 如何检测撤消( ctrl + z )击键?
- 如果我注册了按键事件，如何确定是否阻止默认事件?
- 如果没有，我可以在某个地方注册一些撤消事件处理程序吗?
- 用户不习惯在网络上撤消操作，我该如何训练"操作者?他们来探索/撤消我的应用程序?
- Should I manage the stack, or is there a way to send my commands to the browser's stack ? (and how do I handle native commands, like text edits in textifields in this case)
- how do I handle "command compression" (command grouping) when some commands are browser native
- How do I detect the undo (ctrl+z) keystroke?
- If I register a keyup event, how do I decide if I prevent default or not?
- If not, can I register some undoevent handler somewhere ?
- Users are not used to undo on the web, how can I "train" them to explore/undo on my application ?
推荐答案
您需要具有用于对象创建和删除的功能.然后将这些功能传递给撤消管理器.请参阅我的javascript撤消管理器的演示文件: https://github.com/ArthurClemens/Javascript-Undo-经理
You need to have functions for object creation and deletion. Then pass those functions to the undo manager. See the demo file of my javascript undo manager: https://github.com/ArthurClemens/Javascript-Undo-Manager
演示代码显示画布，但该代码不可知.
The demo code shows canvas, but the code is agnostic.
它不包含键绑定，但是可以帮助您完成第一步.
It doesn't contain key bindings, but may help you with the first steps.
我本人已在Web应用程序中使用此按钮，并在保存旁边带有用于撤消和重做的按钮.
Myself I have used this in a web application with buttons for undo and redo, next to save.
这篇关于实施撤消的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
