kandi X-RAY | UndoManager Summary
kandi X-RAY | UndoManager Summary
UndoManager
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Top functions reviewed by kandi - BETA
- Called when the button is clicked
- Adds an UndoOperation to the current state
- Start an undo state
- Sets the current working state
- Override this method to handle the menu item selection
- Performs a redo operation
- Perform a undo operation
- Attempt to undo the state of the current state
- Finds the next state in the given state list
- Set the new undo label
- Returns the number of undo states on the undo stack
- Handle text change
- Unregister the listener
- Redo the number
- This method is called after a resume activity is executed
- Writes the contents of this object to a Parcel object
- Returns true if there is an operation in the current undo state
- Set the size of undo state
- Suggests a new label for a new undo state
- Writes this object to a Parcel object
- Writes this item to a Parcel object
- SaveInstanceState Method
- Restores the state of the instance
- Create menu menu item
- Commits the current undo state
- Initializes this instance
UndoManager Key Features
UndoManager Examples and Code Snippets
Community Discussions
Trending Discussions on UndoManager
QUESTION
I was integrating gojs with react and was successfully able to integrated the nodes array and links array and was able to see the nodes in my page.
But the toughest thing , integrated ReactOverview (minimap) but i can see only small rectangle box on the page with no diagram in it.
Will share my code here
...ANSWER
Answered 2022-Jan-28 at 13:45The problem is that your component only renders once for the given props (any interactive diagram changes are handled internally by GoJS and React is oblivious to that). When it renders the first and only time, this.diagramRef.current is still null. You can see this if you log it in the render method.
You need to use state to keep the "observed diagram" for the overview. Then when the overview component initializes, the diagram should be all set up and you can set the new state to cause re-render:
- Add the state with the value of the diagram you want to observe in the overview:
QUESTION
I am using gojs-angular npm package and I created a diagram as below. I need to specifically centralize my parent node but I am unable to do that. Problem is how can I centeralize AWS node
State will be like
...ANSWER
Answered 2021-Oct-03 at 17:31For any node, once you have a reference to that node, you can call:
QUESTION
I want to implement undo/redo operations in my app. The undo/redo actions need to be recorded for every document rather than at UIViewController level. So I will need to put UndoManager in the class implementing custom document. But one of the requirement is that undo/redo should be possible even when the app is restarted, which means UndoManager must be persistent. How do we make UndoManager state persistent?
...ANSWER
Answered 2021-Sep-07 at 18:50As far as I know, The UndoManager does not directly relate to your data model, hence does not directly relate to your app state - i.e the data model state. It merely allows you to register some actions that will alter your data model in an undo/redo fashion. To achieve persistency, while using the UndoManager, you will have to use some persistent store (a DB like Core Data or Realm, or for a very simple state you can use UserDefaults). You will have to make the actions you register with your UndoManager to update the persistent store you choose to use. In addition, you will have to somehow keep track of the changes in the DB so you can restore and register them back between application launches.
An example I found online that describes the Undo/Redo actions registrations - taken from this example - https://medium.com/flawless-app-stories/undomanager-in-swift-5-with-simple-example-8c791e231b87
QUESTION
Run this example:
...ANSWER
Answered 2021-Jun-09 at 23:13Undo/Redo should restore the state of the component not alter the state.
I would suggest that when you change the filter you should:
- Save the current text,
- clear the text in the text field
- invoke
discardAllEdits()on theUndoManager. - iterate through the old text one character at a time and insert the character back into the Document. This will allow the text to be filtered while rebuilding the undo/redo as if the text was entered using the current filter.
QUESTION
I have been stuck on this for a while. There are similar problems on stack overflow but none have led me to the solution I'm looking for. Also, can't seem to find any info in the official docs.
I am building a macOS application programatically. I have set up my own menu bar programmatically. I have an NSTextView and some NSTextfields which I have set up perfectly fine as subviews of another view. Everything working except the undo/redo functionality, which I have read is supported in these classes. I have myTextView.allowsUndo = true but it just does not work. Why is the undo manager not automatically doing stuff like I'm pretty sure it is supposed to?
Here is the relevant part of my menu code:
...ANSWER
Answered 2021-May-03 at 02:13This works on my system:
QUESTION
I have a nodes diagram in table layout.
In case I have some nodes in cell I got this table:
Image: https://ibb.co/554y9ck
(behind Q2 there are Q0 and Q1.. they are overlapped)
How can I arrange them nicely? :)
Here is my nodesTemplate:
...ANSWER
Answered 2021-Jan-16 at 14:16If you start from the Table Layout sample, you can just add this line in the Group template:
QUESTION
I made a basic text editor. When I close the window I get an error in the execution of the command, whether I have saved the text file or not.
...ANSWER
Answered 2020-Dec-11 at 14:37System.exit(1);
QUESTION
I am using a TextView UIViewRepresentable as outlined here https://www.appcoda.com/swiftui-textview-uiviewrepresentable/.
It’s working as expected, apart from one issue concerning line spacing. SwiftUI’s lineSpacing modifier seems to have no effect on it. So, I have worked around it by adding the following to the UIViewRepresentable’s
func updateUIView(_ uiView: UITextView, context: Context) :
ANSWER
Answered 2020-Dec-09 at 16:34I may have stumbled across the correct approach thanks to Ivan’s answer in https://stackoverflow.com/a/44414510/698971.
Inside func makeUIView(context: Context) -> UITextView for the TextView UIViewRepresentable I needed to add:
QUESTION
I'm learning about PencilKit.
I have a canvas, and I want to set a background image that we can draw on it.
When I save my canvas, I want my background image to be visible
But I have an error : Cannot convert value of type 'Image' to expected argument type 'UIImage?'
Image("badmintoncourt") is an image from my assets I can't find out how to solve it, but I maybe not in the right way to add a background image to my canvas
...ANSWER
Answered 2020-Dec-03 at 10:29The Image is not a UIView, you have to use UIImageView for this case
QUESTION
I want to be able to access the UndoManager from inside my document model, so I can register undo actions from within the model:
...ANSWER
Answered 2020-Sep-21 at 18:31I have found a solution to this - although it doesn't feel right. At the top level of the View I pass the undoManager to a property I hold on the document:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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No vulnerabilities reported
Install UndoManager
You can use UndoManager like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the UndoManager component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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