undo | 易学教程

Undofile independent of the Vim version

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问题 I'm using the Vim 7.3 feature undofile the following way: if version >= 703 set undofile set undodir=$HOME/.vim/undo set undolevels=1000 set undoreload=10000 endif I am using the same .vimrc and the same files (within a cloud storage) on different machines which do not support Vim 7.3 but use the old 7.2 version which does not support undofile out of box. Is there a solution for the 7.2 version compatible with the 7.3 undofile? 回答1: version check Because persistent undo was introduced with

Preventing a RichTextBox operation from being added to the control's Undo stack

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问题 Editing a RichTextBox control's text (more specifically, modifying selection font/color) programmatically seems to be tracked in the control's built in undo stack. Is there a way, short of writing my own undo/redo "manager", to prevent certain actions/operations from being added to the undo stack ? 回答1: No cando. At best you can flush the undo stack completely by sending EM_SETUNDOLIMIT twice. EM_SETTEXTEX offers the same option with the ST_DEFAULT flag. Surely not what you want. Look at

Eclipse reverts all changes to file on key press, undo not possible?

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问题 Somehow I just pressed some key or key combination in eclipse (android development) and eclipse suddenly restored the previous version of the file I was working on. CTRL Z/Y does not help. Do I have to do all my changes to the file again!?? And WHAT could I have just done? I don't want that to happen anymore. How could I possible continue working with eclipse knowing this could happen again sometime. Thanks, 回答1: I think I had the same problem and figured it out after a few minutes. Eclipse

WPF快速入门系列(5)——深入解析WPF命令

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WPF快速入门系列(5)——深入解析WPF命令一、引言　　WPF命令相对来说是一个崭新的概念，因为命令对于之前的WinForm根本没有实现这个概念，但是这并不影响我们学习WPF命令，因为设计模式中有命令模式，关于命令模式可以参考我设计模式的博文： http://www.cnblogs.com/zhili/p/CommandPattern.html 。命令模式的要旨在于把命令的发送者与命令的执行者之间的依赖关系分割开了。对此，WPF中的命令也是一样的， WPF命令使得命令源(即命令发送者，也称调用程序)和命令目标（即命令执行者，也称处理程序）分离。现在是不是感觉命令是不是亲切了点了呢？下面就详细分享下我对WPF命令的理解。二、命令是什么呢？　　上面通过命令模式引出了WPF命令的要旨，那在WPF中，命令是什么呢？对于程序来说，命令就是一个个任务，例如保存，复制，剪切这些操作都可以理解为一个个命令。即当我们点击一个复杂按钮时，此时就相当于发出了一个复制的命令，即告诉文本框执行一个复杂选中内容的操作，然后由文本框控件去完成复制的操作。在这里，复杂按钮就相当于一个命令发送者，而文本框就是命令的执行者。它们之间通过命令对象分割开了。如果采用事件处理机制的话，此时调用程序与处理程序就相互引用了。　　所以对于命令只是从不同角度理解问题的一个词汇，之前理解点击一个按钮，触发了一个点击事件

How can I “undo” the programmatic insertion of text into a textarea?

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问题 I have a textarea and a button. Clicking the button causes text to be inserted into the textarea. Is there a way to allow a user to press Ctrl/Cmd+z to undo the insertion of text and revert the textarea to its previous state? 回答1: I think the easiest approach to leverage browser's undo stack instead of capturing events. To do this you need to use different codes for different browsers. Luckily out of all major browsers only Firefox has a different approach. // http://stackoverflow.com/a

GitHub undo a discard

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问题 I was working on some files and accidentally discarded all the files from github. I know that as soon as you discard there is an undo button at the bottom. But I restarted my gitub and now I do not have the undo button anymore. Is there any way I can undo my discard and get back my files? I hope there is, pls let me know if you have any ideas. Thanks! 回答1: The discard (that you can see in "Undo Button in GitHub for Windows") is available to reset files added to the index. That means you added

Prevent Vim from updating its undo tree

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问题 I have a Vimscript function which is called on BufWritePre to check the integrity of the file. Typically this involves trimming whitespace and checking that the fold structure is "valid" (according to my company's conventions). My problem is that if I edit a file and then save it, the undo tree contains the edits made by the checking function. Is there a simple way to say that I don't want a function to modify the undo tree? Or can I save its state at the start of the function and restore it

How to undo / redo selective parts of code?

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问题 I am using Eclipse. It happens a lot when we develop code like this (assume it is developed sequentially, from top to bottom): Part 1 (*) Part 2 Part 3 Part 4 (*) Part 5 But we just figured out that parts 1 and 4 (marked with (*)) are wrong and the others are just fine. The question is that how we can undo just those two parts (1 and 4) without undoing the rest? If we could undo selectively, it was great. Note that simply reverting the code to the version 1 loses parts 2, 3 and 5 which are

Undo previously seeded data in Rails

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问题 I have seeded a row of data to my table by editing db/seed.rb file and executing rake db:seed command. Unknowingly, I put some wrong information in to that row. So I want to remove the previously added row of data. Is there any rake command for the same like rake db:rollback for rake db:migrate . 回答1: There are a couple of aspects to this: 1: You want to change the seed data when no other data is present in the database: You should simply redo the rake db:seed after updating the seed.rb file.

How do I make a DataGridView immediately commit edits?

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问题 I have a master-detail layout with a section of popup menus (the Details) and a section with a DataGridView which holds the rows. The popup-menu state is updated when the selected row in the DataGridView changes and the state in the DGV's selected row should update when the popup-menu changes. All of this works except the row in the DataGridView doesn't immediately update when I change the value of the popup-menu. I have to select a different row in order to see my edits. I'm assuming this is