MVVM | Model View View-Model in Python

 by   davidcorne Python Version: Current License: No License

kandi X-RAY | MVVM Summary

kandi X-RAY | MVVM Summary

MVVM is a Python library. MVVM has no bugs, it has no vulnerabilities and it has low support. However MVVM build file is not available. You can download it from GitHub.

A project I started working on a while ago using the Model, View, View-Model design pattern in python with TKinter. This is an email GUI for use with an smtp server. It shows two way bindings and property changed functions to update the view. It also has the ability to use a style defined in a xml file.
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            kandi-support Support

              MVVM has a low active ecosystem.
              It has 7 star(s) with 1 fork(s). There are 2 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              MVVM has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of MVVM is current.

            kandi-Quality Quality

              MVVM has no bugs reported.

            kandi-Security Security

              MVVM has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              MVVM does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              MVVM releases are not available. You will need to build from source code and install.
              MVVM has no build file. You will be need to create the build yourself to build the component from source.

            Top functions reviewed by kandi - BETA

            kandi has reviewed MVVM and discovered the below as its top functions. This is intended to give you an instant insight into MVVM implemented functionality, and help decide if they suit your requirements.
            • Set authentication property
            • Called when all properties have changed
            • Called when a property has changed
            • Send a message to the server
            • Validate the credentials
            • Reads a style file
            • Return the style node for the given style
            • Applies style to widget
            • Configure widget style
            • Set email address
            • The error
            • Set the server s value
            • Set password
            • Set the recipient s recipient
            • Set username
            • Sets the recipient label
            • Validate the credentials
            • Return the error of the model
            Get all kandi verified functions for this library.

            MVVM Key Features

            No Key Features are available at this moment for MVVM.

            MVVM Examples and Code Snippets

            No Code Snippets are available at this moment for MVVM.

            Community Discussions

            QUESTION

            MVVM WPF - How to update DataGrid bound to ObservableCollection
            Asked 2021-Jun-15 at 17:35
            What I'm trying to do:

            I have a WPF app, linked to a SQL-server. I am using the MVVM-light package (I do actually have Prism.Core installed, but I'm not sure if I'm using it or not.... new to MVVM).

            There's a DataGrid, bound to an ObservableCollection. I have been trying to implement the PropertyChangedEventHandler, but I can't seem to get it to work.

            I have a Delete button bound, and I am able to remove rows, but when I re-open the form, the changes does not carry over.

            I tried to change the binding-mode for the DataGrid from OneWay to TwoWay. With OneWay, the changes does not carry over when I re-open the form. With TwoWay, I get this error message when opening the child form (which contains the DataGrid):

            System.InvalidOperationException: 'A TwoWay or OneWayToSource binding cannot work on the read->only property 'licenseHolders' of type 'Ridel.Hub.ViewModel.LicenseHoldersViewModel'.'

            So, If I then add a set; to my public ObservableCollection licenseHolders { get; }, the program runs, but the previous problem persists, like it did when there was a OneWay mode configuration on the DataGrid.

            What do I need to do to get this to work without communicating directly with the Sql-server, which would defy the whole point of using this methodology in the first place?

            ViewModel: ...

            ANSWER

            Answered 2021-Jun-15 at 13:26

            You are confusing topics. The VM needs InotifyPropertyChanged events, which you have but are not using, to notify the Xaml in the front-end that a VMs property has changed and to bind to the new data reference.

            This is needed for Lists or ObservableCollections. Once that is done, the ObservableCollection will then send notifications on changes to the list as items are added or removed.

            Because you miss the first step:

            Source https://stackoverflow.com/questions/67986693

            QUESTION

            Delete selected row in DataGrid bound to an ObservableCollection
            Asked 2021-Jun-15 at 12:02

            I'm writing an app in WPF, trying to use the MVVM-design pattern (which is new to me). I have a DataGrid bound to an ObservableCollection.

            What I'm trying to achieve:

            Delete the currently selected DataGrid-row using a 'Delete'-button. I've tried a plethora of forum-posts and videos to find a solution. The solution has probably stared me right in the face several times, but at this point I'm more confused than I was when I first started.

            Any assistance would be appreciated.

            ViewModel (updated with working code, thanks to EldHasp):

            ...

            ANSWER

            Answered 2021-Jun-14 at 20:15

            You can use Prism. Intall package Prism.Core then Install-Package Microsoft.Xaml.Behaviors.Wpf -Version 1.1.31 packages in your project, in your xaml declare namespace as - xmlns:i="http://schemas.microsoft.com/xaml/behaviors"

            Source https://stackoverflow.com/questions/67976219

            QUESTION

            Exposing business classes from business library in Google Apps Script
            Asked 2021-Jun-15 at 10:30

            So, I am working on an MVVM-based core SDK for use any time I am developing some Google Apps Script based software, called OpenSourceSDK. It contain core business logic, including base classes to extend. For example, the file Models/BaseModel.gs in it is defined to be:

            ...

            ANSWER

            Answered 2021-Jun-13 at 22:53

            I was able to get it resolved, but the solution is...hacky.

            So, apparently, Google Apps Script exports only what is in globalThis of a project: just the functions and variables. No classes, no constants, ...

            Probably has a lot to do with how ES6 works, with its globalThis behavior. One can see that in action, by creating a dummy function, a dummy variable, and a dummy class in their local developer console:

            Source https://stackoverflow.com/questions/67954208

            QUESTION

            In AvaloniaUI, how to display an image from a web URL?
            Asked 2021-Jun-14 at 22:06

            I'm developing an Avalonia App using ReactiveUI and MVVM. I want to display an image from a web URL, what would be the best course of action to achieve this ? I have setup the following Binding :

            ...

            ANSWER

            Answered 2021-May-22 at 09:34

            You can download and store the Image in your ViewModel asynchronously, or using the download complete event for example like this:

            Source https://stackoverflow.com/questions/67536123

            QUESTION

            Is it possible to implement a module that is not a WPF module (a standard class library, no screens)?
            Asked 2021-Jun-14 at 18:20

            I am developing a modular WPF application with Prism in .Net Core 5.0 (using MVVM, DryIoc) and I would like to have a module that is not a WPF module, i.e., a module with functionality that can be used by any other module. I don't want any project reference, because I want to keep the loosely coupled idea of the modules. My first question is: is it conceptually correct? Or is it mandatory that a module has a screen? I guess it should be ok.

            The second and more important (for me) is, what would be the best way to create the instance?

            This is the project (I know I should review the names in this project):

            HotfixSearcher is the main class, the one I need to get instantiated. In this class, for example, I subscribe to some events. And this is the class that implements the IModule interface (the module class):

            ...

            ANSWER

            Answered 2021-Jun-14 at 18:20

            Or is it mandatory that a module has a screen?

            No, of course not, modules have nothing to do with views or view models. They are just a set of registrations with the container.

            what would be the best way to create the instance?

            Let the container do the work. Normally, you have (at least) one assembly that only contains public interfaces (and the associated enums), but no modules. You reference that from the module and register the module's implementations of the relevant interfaces withing the module's Initialize method. Some other module (or the main app) can then have classes that get the interfaces as constructor parameters, and the container will resolve (i.e. create) the concrete types registered in the module, although they are internal or even private and completely unknown outside the module.

            This is as loose a coupling as it gets if you don't want to sacrifice strong typing.

            is there a way to get rid of that var searcher = containerProvider.Resolve(); and a better way to achieve this?

            You can skip the var searcher = part :-) But if the HotfixSearcher is never injected anywhere, it won't be created unless you do it yourself. OnInitialized is the perfect spot for this, because it runs after all modules had their chance to RegisterTypes so all dependencies should be registered.

            If HotfixSearcher is not meant to be injected, you can also drop IHotfixSearcher and resolve HotfixSearcher directly:

            Source https://stackoverflow.com/questions/67973835

            QUESTION

            What is the best way to create window from ViewModel?
            Asked 2021-Jun-14 at 15:28

            As i title suggests, i want to know what is the best and simplest method to create window from ViewModel in MVVM pattern.

            ...

            ANSWER

            Answered 2021-Jun-14 at 15:28

            i want to know what is the best and simplest method to create window from ViewModel in MVVM pattern

            "The best", "the simplest" are very subjective concepts.
            For some, a simple implementation may be considered difficult by someone.

            This topic is very large, and for a detailed answer to such a question, you will need to write a thick textbook.
            Therefore, in short, general concepts, and an example of a possible implementation.

            From the ViewModel's point of view, it cannot "know" what a Window is. So asking the question "How should a VM create a Window?" - it is not correct.
            The question should be asked like this: "How does the VM call an external dialogue?".
            How this dialog will be implemented (WPF Window, Form or Console Input) for the VM does not matter.
            A dialog is, in fact, a delegate to a method that returns a dialog result.
            In the simplest case, the diaolog's result is just a bool (success / failure).
            Let's say OpenFileDialog.ShowDialog returns Nullable .
            In more complex cases, an enumeration is returned. Sample MessageBox.
            What kind of dialogue result you need depends on the conditions of your task.

            Suppose if this is an element editing dialog, then it receives an element for editing in its parameters, and it can return bool: true - editing is completed and its results need to be saved, false - editing cancellation.

            Gets the ViewModel delegate, usually at the time of its creation. This is called dependency injection.
            A typical place for Dependency Injection is App.

            An example will link to your previous topic WPF MVVM binding command to Datacontext inside Datagrid

            Source https://stackoverflow.com/questions/67969092

            QUESTION

            WPF MVVM binding command to Datacontext inside Datagrid
            Asked 2021-Jun-14 at 09:42

            I'm creating a WPF Molds app that contains 2 windows: MainWindow with DataGrid, and AddEditWindow which allows to Add/Edit Molds.

            I have a EditButton which located in a TemplateColumn of DataGrid:

            ...

            ANSWER

            Answered 2021-Jun-14 at 08:37

            In a Code-Behind, I could done something like this:

            Take a closer look at your XAML.
            You have a binding set in the CommanParameter property.
            The binding instance is empty - this means that the binding occurs to the DataContext of the element in which it is specified.
            Hence, in the command parameter, you will get this Data Context.

            Source https://stackoverflow.com/questions/67959671

            QUESTION

            MVVM with Retrofit - How to deal with a lot of LiveData in Repository?
            Asked 2021-Jun-14 at 06:34

            I'm following this tutorial on using MVVM with Retrofit

            https://medium.com/@ronkan26/viewmodel-using-retrofit-mvvm-architecture-f759a0291b49

            where the user places MutableLiveData inside the Repository class:

            ...

            ANSWER

            Answered 2021-Mar-23 at 18:00

            The solution you're looking for depends on how your app is designed. There are several things you can try out:

            • Keep your app modularized - as @ADM mentioned split your repository into smaller
            • Move live data out of repository - it is unnecessary to keep live data in a repository (in your case singleton) for the entire app lifecycle while there might be only few screens that need different data.
            • That's being said - keep your live data in view models - this is the most standard way of doing. You can take a look at this article that explains Retrofit-ViewModel-LiveData repository pattern
            • If you end up with complicated screen and many live data objects you can still map entities into screen data representation with events / states /commands (call it as you want) which are pretty well described here. This way you have single LiveData and you just have to map your entities.

            Additionaly you could use coroutines with retrofit as coroutines are recomended way now for handling background operations and have Kotlin support if you wanted to give it a try.

            Also these links might halpe you when exploring different architectures or solutions for handling your problem architecture-components-samples or architecture-samples (mostly using kotlin though).

            Source https://stackoverflow.com/questions/66467435

            QUESTION

            Prevent tableview from being reused (MVVM )
            Asked 2021-Jun-13 at 11:07

            I know how to preserve the action we have done on UITableView, after scrolling back and forth.

            Now Iam doing a simple UITableView on MVVM which has a Follow button . like this. Follow button changes to Unfollow after click and resets after scrolling. Where and How to add the code to prevent this?

            Here is the tableview Code

            ...

            ANSWER

            Answered 2021-Jun-13 at 11:07

            I guess your main issue is with Button title getting changed on scroll, so i am posting a solution for that.

            Note-: Below code doesn’t follow MVVM.

            Controller-:

            Source https://stackoverflow.com/questions/67956268

            QUESTION

            Custom Delegate causing errors on button tap
            Asked 2021-Jun-11 at 20:13

            I'am working on a simple tableView project on swift with MVVM architecture. But when I tap a button on that tableView I'am getting an error like this:

            Thread 1: Simultaneous accesses to 0x7faf490331c8, but modification requires exclusive access

            I have defined a model like this

            ...

            ANSWER

            Answered 2021-Jun-11 at 20:13

            Modify your @objc private func didTapButton(). Instead of

            Source https://stackoverflow.com/questions/67939750

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install MVVM

            You can download it from GitHub.
            You can use MVVM like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

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            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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