undo

How to utilize sqlite for undo/redo features?

由 不问归期 提交于 2019-12-09 13:36:36
问题 I'm writing a desktop application to do vector drawing in C++, and considering using sqlite to back my undo/redo feature. Has anybody used sqlite for undo/redo features? How does it work out for you? Clarification: I was aware of the stack approach, I have even implemented one application with that approach. The problem I encountered was that it becomes hard to maintain after a while. What I meant by utilizing sqlite is that I will map my entire in-memory data structure into a sqlite database

How to undo 'exclude from project' in Visual Studio 2008 [duplicate]

由 坚强是说给别人听的谎言 提交于 2019-12-08 21:01:09
问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Undo VS 'Exclude from project'? I mistakenly chose the Exclude From Project menu item thinking I could choose what to exclude but it excluded the currently opened file. I did not notice what file that was and there is no undo enabled. How can I undo this operation? How can I detect what file was excluded? Is there some kind of log file? 回答1: Choose "Add > Existing Item..." then add the files you have excluded 来源

How to use Ctrl+Z and Ctrl+Y with all Text Components?

由 北战南征 提交于 2019-12-08 15:55:50
问题 In fact i know how to implement using CTRL + Z (Undo) and CTRL + Y (Redo) with one JTextField. But i have hundreds of Text Components in my Swing application, so is there a way to apply this for all Text Components in my application, so when i click CTRL + Z in any Text Component it would undo the last entry in that Field ? I have tried to implement it in EventQueue, but it did not work ! 回答1: you can gel list of built_in KeyBindings short_cuts implemented in the API's notice you have to

How to undo a line stroke ios

由 旧城冷巷雨未停 提交于 2019-12-08 09:41:53
问题 Im developing a colouring app, however I cant manage to implement an UNDO button. I am unsure of the approach, I have tried implementing NSUndoManager, but I could not get it to work effectively. My approach is possibly incorrect. Im would greatly appreciate an answer that uses code, based on my example. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = NO; UITouch *touch = [touches anyObject]; lastPoint = [touch locationInView:self.view]; } - (void)touchesMoved

How to implement an undo()-Method for a List-Class in Python

由 你说的曾经没有我的故事 提交于 2019-12-08 07:22:40
问题 Im kinda new with python and I got a task to create a class "UndoList" (type list) with an undo()-method. This method should undo typical list-operations like, append, insert, remove... >>> ul = UndoList([1,2,3]) >>> ul.append(4), print(ul), undo(ul), print(ul) [1,2,3,4] [1,2,3] >>> ul.remove(3), print(ul), undo(ul), print(ul) [1,2] [1,2,3] ... This undo()-method should only undo one operation (as u can see in the example). My teacher gave me the hint, to save the value of the list in the

Git: temporarily reverting pushed commit(s)

由 天涯浪子 提交于 2019-12-08 05:06:23
问题 Say, you've pushed some commits and pulled them into production, in your server's webroot, for example. And then something goes wrong. Clearly, most often what you want to do is temporarily revert the files in the webroot to some previous state, then go back to your local development place, fix what is broken, test it, commit on top of commits that broke something and push these new fixing commits to the master branch. And then just go to the production webroot again and pull everything to

Don't add changes made via VBA to the undo history

由 懵懂的女人 提交于 2019-12-07 06:34:56
问题 I have a set of Word macro's that format documents that are sent to from an external source. Usually there are a lot of changes made to the document, all of which are recorded in the undo history, which I don't want. Is there a way to not add all of these changes to the undo history, but rather just add one undo action that will undo everything the macros have done? Thanks. 回答1: This is not available for Word 2007 or earlier. The UndoRecord object was added in Word 2010 and lets you "clump"

redo和undo

由 一曲冷凌霜 提交于 2019-12-06 13:50:19
重做日记文件分为：在线重做日记文件和归档重做日记文件。当硬盘坏掉时，可以利用归档日记，掉电时可以利用在线日记。 数据缓存区：数据块 逻辑结构和物理结构 多层体系结构：应用服务器 1.连接数据库服务器，验证用户身份，代替用户对oracle数据进行操作； 控制文件： 数据库名 数据文件、重做日志文件的名称和位置 数据库创建的时间戳 Oracle数据库的 实例 每次启动时，通过控制文件中的内容来确定哪些数据库文件和重做日志文件是执行数据库操作所必需的 逻辑数据库结构概述: 1.1.4.2 Oracle数据块 在Oracle数据库中，最精细的数据存储粒度是 数据块 （data blocks）。一个数据块相当于磁盘上一段连续的物理存储空间。数据块分配的默认容量由初始化参数 DB_BLOCK_SIZE 决定。除了这个参数，管理员还可以额外设定5个数据块容量参数。Oracle数据库在数据块中分配、利用存储空间。 Oracle实时应用集群（RAC，Oracle Real Application Clusters）可以使一个数据库运行在网格中多个集群节点上，即把多个计算机的处理能力作为池。 实例包含内存和后台进程，系统全局区sga包含数据和控制信息内存，sga可以分为数据库缓存区 重做日志缓冲区，共享池。 重做缓存区中的重做条目被写入练级重做日记。 数据库管理员在执行这些步骤时，可以使用SQL

acl的基础知识以及工作原理配置

由 吃可爱长大的小学妹 提交于 2019-12-06 10:07:02
实验名称：acl基础配置 -作用： 匹配感兴趣的流量。 实验拓扑： 实验要求:pc1能ping通所有网络，其余网络都不同 实验目的：熟悉acl的应用 实验步骤： 第一：先使所有网络都能相互ping通 sw1 <Huawei>undo terminal monitor Info: Current terminal monitor is off. <Huawei>sys Enter system view, return user view with Ctrl+Z. [Huawei]vlan batch 10 20 50 Info: This operation may take a few seconds. Please wait for a moment...done. [Huawei]inter Ethernet0/0/1 [Huawei-Ethernet0/0/1]undo shutdown [Huawei-Ethernet0/0/1]port link-type access [Huawei-Ethernet0/0/1]port default vlan 10 [Huawei-Ethernet0/0/1]inter eth0/0/2 [Huawei-Ethernet0/0/2]undo shutdown Info: Interface Ethernet0/0/2 is not

Undo changes in an arrayList

由 ＊爱你＆永不变心＊ 提交于 2019-12-06 07:58:21
I've an ArrayList of Line Objects called 'lines'. I made my own line class to draw lines with some constraints. It involves selecting two points in a panel and a line is drawn connecting the two points. Everytime a line is created, it is added to the 'lines'. The lines are drawn in a panel. The paint function in my panel looks like this: public void paintComponent(Graphics g){ super.paintComponent(g); for(final Line r:lines){ r.paint((Graphics2D)g); } } And everytime two points are clicked on the panel, a new line is created. class Board extends JPanel{ public void placeLine(){ Point p1,p2;
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