contextmenu | A dead simple React contextmenu | Frontend Framework library
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kandi X-RAY | contextmenu Summary
A dead simple React contextmenu.
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QUESTION
I'm trying to have an MVVM architecture while Models are EF Models too.
In Code :
Model:
...ANSWER
Answered 2021-Jun-07 at 14:12This is a very large topic and I doubt that it will fit the format adopted here.
Therefore, I will briefly outline only the main points.
It is customary to implement WPF using the MVVM pattern.
It is a strict 3-tier architecture: View (WPF) -> ViewModel -> Model.
The Model is responsible for working with "real" data - this is the so-called Business Logic.
View is responsible for creating the GUI.
The peculiarity of WPF is that the UI elements themselves request the data they need through the bindings.
Bindings are created (mostly) to the DataContext.
Therefore, it is necessary to put some special custom type there, which is responsible for the links between the View and the Model.
This type is called ViewModel.
In a typical implementation, the Model basically receives / returns data via methods.
And bindings need properties.
Therefore, one of the main functions of the ViewModel is to provide all the data necessary for the View in its properties.
When an application works with a database, it is customary in Sharpe to implement this in the Repository (Data) pattern.
From the MVVM point of view, such a Repository is part of the Model.
But, for a simpler understanding, to facilitate software maintenance, the Repository is usually implemented in a separate layer.
As a result, we get a four-tier architecture: View -> ViewModel -> Model -> Repository.
According to the rules and principles of OOP, SOLID in a layered architecture, each layer "knows" (has information) only about the underlying layer.
And all non-public information must be encapsulated inside the layer.
EF entities reflect database data, they are mutable, and can have corresponding attributes.
When changing the source, these types can change.
Let's say you, at some point, want to use a set of XML files instead of a database.
And they need entities of a different type.
Therefore, such entities are the internal implementation of the Repository.
And to exchange data with the Model, the Repository must be either Model types or generic DTO types.
At the next level, the ViewModel must also receive data from the Model.
But Model types cannot be used here, since they can be implicitly associated with Business Logic and there is a possibility of creating parasitic connections leading to unpredictable bugs.
At this level (ViewMode-> Model), exclusively DTO types are used for data exchange.
They are preferably immutable.
The next level of exchange of View with ViewModel.
First, the GUI often needs mutable properties. And to auto-update the property view, the type MUST implement INotifyPropertyChanged.
Secondly, to call actions from the GUI, the ViewModel must provide COMMANDS in its properties - this is the ICommand implementation.
For my answers here, I am using the BaseInpc and RelayCommand classes.
Thirdly, in types for View, additional properties are often needed to ensure the logic of the GUI operation: a selected element, an expanded element, instead of the Id of the record, an element reflecting it, etc.
For these reasons, at the ViewModel level, you already need your own types with an implementation other than DTO.
As a result of the above, we can get four different implementations for the type reflecting some record in the database.
The area of use of each type will be in one or two layers.
In order not to get confused in all this, it is better to do each layer in a separate project.
Types used only within the layer are implemented in this project.
The types used by several layers (for example, DTO) are implemented in separate libraries (maybe for simple tasks and one common library).
To maintain abstraction, it is desirable to do all implementations through the preliminary declaration of interfaces.
And transfer information between layers through these interfaces.
QUESTION
Everytime the route changes (recordTab.Id changes) I have to construct a new grid with five columns and output it. The following code generates the grid every route change
...ANSWER
Answered 2021-Jun-07 at 18:28You should take a look at trackBy. It will tell your ngFor to only rerender what changed based on what you are tracking. It's hard to tell if it can work in your case but there is no other solution since as soon as the array changes, angular loose track of what's going on and needs to render the *ngFor again.
It would look like that:
QUESTION
I was able to scale in scale out x axis and y axis , Its working very good with arrow keys , I want to do that with touchpad aswel.I tried this below code ,its working but its not smooth .Sometimes when i zoom in X , its even zooming in Y and vice versa. window.addEventListener('mousewheel', function(e) {
...ANSWER
Answered 2021-Jun-06 at 20:15I found a quite interesting example of multi-touch trackpad gestures in JavaScript.
The code snippet below utilizes this for overriding LCJS chart interactions for trackpad. To me it seems to perform in a surprisingly intuitive manner for zooming in/out on pinch interaction (2 fingers, move to opposite directions) and panning with dragging 2 fingers in same direction.
I did not find any way to differentiate pinch interaction along X and Y separately, it seems that the JS events just get a single value for both, which is assigned to deltaY
.
QUESTION
On right click on the blue section there will show a div element but if height and width from the cursor to right and bottom end are smaller than 100px, then the div should not shown there. But it is showing.
In the JavaScript parent.addEventListener
I've created an if statement to do this and provided conditions are false as I also have logged that in the console, whether it is showing false but code inside the if statement got executed.
ANSWER
Answered 2021-Jun-04 at 16:28Part of the issue here is that your code is checking against an offset of 300, not 100 as described in the question text -- which means it's impossible to trigger a false condition (because the element is 300px square.)
Changing your code to check an offset of 100px instead shows it mostly working... but the test for showing the menu also compares against the menu's offsetWidth
and offsetHeight
, both of which change to zero when the element is display:none
, which throws off your calculation.
Finally, you're adding the offsetHeight
instead of subtracting it as intended (the only reason this appeared to work was when what you were adding was actually zero.)
Here's the result of correcting the math, and using visibility
instead of display
to control whether the child is shown (visibility
keeps the element's original size intact):
QUESTION
i added two functions in two different pushButtons. for both function i used a common qtableView.
i created two contextmenu, whenever user clicked pushButton1
func1
is called and result set will be shown in qtableView
and user can select items from contextmenu1 and same like pushButton2
,where contextMenu2
will appear . but in my code context menu is not showing correctly.
for ex:
if user hit pushbutton1 then for both dataset context menu is same. so context menu is depends on which pushButton hit first.
also menu is not close quickly after selected the item ,why!
main.py
...ANSWER
Answered 2021-Jun-03 at 16:42Every signal connection triggers the target slot (function). If you connect the same signal to two functions, both functions get called, even if you connect twice to the same function. In fact, when you say "menu is not close[d] quickly after select[ing] the item", the truth is that the menu is opened multiple times. You can easily check that if you just add a print
statement to each function.
There are different solutions depending on the situation (unfortunately, your code and function namings aren't very verbose, so we cannot really know what every function does).
Disconnect from all other slotsThis can be done by calling a simple disconnect()
on the signal, which disconnects from all other (already) connected slots. Note that this would raise an exception if no connection exists, so it should be done inside a try/except block:
QUESTION
I have to apply styling on a ContextMenu item in wpf, the menu is dynamically created based on some input.
...ANSWER
Answered 2021-Jun-02 at 20:19Maybe something like this?
Style style = new Style(typeof (ContextMenu));
style.Setters.Add(new Setter(ContextMenu.CornerRadius, 5));
QUESTION
I have written a simple extension for a company website that reads the array of projects, and alerts the title of the project when I hover over it. This works perfectly, but it is not what I'm looking for:
...ANSWER
Answered 2021-May-31 at 08:45If you want that the menù displays an items with the title of selected project I think you are out of luck. I don't believe there is a way to do it.
But If you want the menù displays an items with your selection try this.
QUESTION
So I already have it so that when I click on a MenuItem field on my last button ContextMenu, the content is automatically adopted as the content for the button. Here is the code:
...ANSWER
Answered 2021-May-28 at 09:35This should work:
QUESTION
I've created a Context menu with a tree structure (added Menu items, then added Checkboxes within those menu items as sub-menu items). This works just fine in terms of adding/removing items manually. However, when it comes to programmatically resetting items there is a conflict in terms of a general Component vs. specific component (in this case, a Checkbox).
...ANSWER
Answered 2021-May-28 at 07:57What Hawk said:
If you've created the menu item something like menuItem.getSubMenu().addItem(new Checkbox("My option"))
, then you can iterate through the child components and deselect them:
QUESTION
I am currently working with Reality Capture API. I'm developing on a Mac and using Unity3D as my primary development tool. When adding images to my PhotoScene, I'm seeing that each file size results in the size being 0. I'm also seeing that only a single image is being processed per request via the return response
in the documentation below
https://forge.autodesk.com/en/docs/reality-capture/v1/tutorials/create-3d-mesh-from-photos/
On step 3, adding images to the API, you are able to upload via a path. Currently my path looks like the following with the total images incrementing up to 350. As the API states, you are limited to 20 images per request.
...ANSWER
Answered 2021-May-28 at 14:28It looks like the problem is at code level. If the file shows in photoscene, but has a zero filesize, it means that the file was allocated, but the "upload protocol" is wrong. From my humble experience, it is usually due to wrong content-type or file upload.
I am not very "tech savvy" in Unity, nor in C#, but my suggestion would be to try uploading it not as "multipart/form-data", but rather as "application/x-www-form-urlencoded".
Just try something like this outside Unity in vanilla C# env:
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