DragDrop | JavaScript micro-framework for adding drag | Widget library

Everything seems to be simple and there are quite a few tutorials, but I cannot transfer data (in my case, an image) to a wpf window element. I was able to implement the transfer of an image from one element to another. But when I capture an image (for example, a desktop), when I transfer it to the desired element, the transfer option does not even appear, only a crossed-out circle and does not work out more than one event associated with drop (as if AllowDrop = false)

My code:

XAML

Every dialog in my app looks more or less like this:

I am trying to create a custom control in WPF that is an ItemsControl (with a customizable data template) that supports dragging items from one container to another. The dragging logic is pretty straight forward and I have managed to get that working.

The problem is that I'm trying to show a simple drag adorner (that's essentially a screenshot of the item/datatemplate being dragged). While I have managed to display the adorner and get it to follow the mouse cursor, it is extremely laggy. I have played around with two methods of building the adorner - first one would be attaching a content presenter to my custom adorner; the second would be actually overriding the OnRender method and drawing it myself. Both methods feature really poor performance.

This is how I've implemented my adorner:

I'm trying to make a collaborative whiteboard, where multiple clients connect to the server and each can see what everyone is drawing on the board. The way that it is run is first you have to type in the terminal node server.js to execute the server.js file, which runs on localhost:5000. After that you open a new terminal and then type npm start and it opens the React app on localhost:3000. Now the problem is that my other device tells me GET http://localhost:5000/user net:ERR_CONNECTION_REFUSED when I click on inspect. This is the link to show me JSON data of pictures from the MySQL database. So I cannot see pictures from the database on the whiteboard on different devices. Only on my own device. But the weird thing is that I can only see the JSON data when I explicitly type the IP address and then the port and /user in a different tab. But on the whiteboard itself, it tells me this error and shows me no pictures from the database.

This is the server.js code:

I have embedded plotly dash with highchart . My requirement is when I press the Apply button the graph should be displayed . But when I run the code itself the graph is displaying .

I'm trying to learn how to implement Drag and Drop to model/view settings in Qt. As an exercise, I attempted to do that to the Editable Tree Model example available at the Qt web site:

To extend it with Drag and Drop, I followed the instructions in Qt's documentation on "Using Drag and Drop with View Items", more specifically "Using model/view classes".

I placed the code for my attempt at a GitHub repository. The main modifications are below but there are other important ones; here are the full changes according to the documentation.

I am attempting to drag and drop an image created by a for loop from one div (called here sideDiv) to another (called dropZone here). With the current code I have I am getting an Uncaught DOMException: Failed to execute 'append' on 'Element': The new child element contains the parent and am a bit lost as to why I am getting this. I am a JavaScript noobie and have done a bit of googling and haven't come up much with an answer as to how I can solve this. I have seen videos of where the element that is appended is appended by using a variable that is stored globally, however since these images are generated by a for loop in a function I don't seem to be able to access them. Any help with this would be greatly appreciated! Attached is the relevant Javascript.

JS fiddle here : https://jsfiddle.net/h9e6034s/

Sorry of the above statement of the question isn't clear I don't know exactly how to frame it.

My query is I have some buttons which have same functionality but they are repeated Hence i want to redice the code so i want to call the function with object name and get values / do any operation on that object

Here is a sample code.

I have a QListView where items can be reordered with drag-and-drop by setting dragDropMode to DragDrop and defaultDropAction to MoveAction. How can I intercept the drop event, to find out what is trying to be moved where in relation to the rest of the list, so that I can cancel this action under certain conditions? E.g. I want to forbid moving some items behind other.