[FEATURE] Support Drag and Drop

[ShaMan123]

Description

Add support to dragstart event so that the mathlive data will be available on drop event similarly to copy event. I am willing to PR, wanted to see if I'm I in the right direction.

Is this the place to add the functionality?https://github.com/arnog/mathlive/blob/59c3091896053bd7c2e328f9c785270f9d748847/src/editor/keyboard.ts#L299

Something like:

target.addEventListener('dragstart', (ev) => handlers.copy(ev), true);

I believe this is the source of the copy logic: https://github.com/arnog/mathlive/blob/59c3091896053bd7c2e328f9c785270f9d748847/src/editor-mathfield/mode-editor.ts#L26 Simply replacing all ev.clipboardData occurrences into a variable should do the job.

static onCopy(mathfield: MathfieldPrivate, ev: ClipboardEvent): void {
   ModeEditor.handleDataTransfer(ev.clipboardData)
}
static onDragStart(mathfield: MathfieldPrivate, ev: DragEvent): void {
   ModeEditor.handleDataTransfer(ev.dataTransfer)
}
static handleDataTransfer(mathfield: MathfieldPrivate, dataTransfer: DataTransfer): void {
   //  handle the logic, it is exactly the same for both events so it remains unchanged
}

[arnog]

That sounds great!

Since the event is not related to the keyboard, I would add the event listener in mathfield-private.ts, probably around where there's a event listener for the wheel event.

Factoring handleDataTransfer makes sense, and probably does belong inmode-editor.ts.

[ShaMan123]

Great! I'll get to it in the upcoming days. How do I test/dev mathlive? I'm not working on linux. I see the scripts are linux scripts

[arnog]

There's some information here: https://github.com/arnog/mathlive/blob/master/documentation/CONTRIBUTOR_GUIDE.md

The scripts use the Bash shell, but it should work on any operating system (macOS, Windows, Linux).

After npm install use npm run start to build and launch a test environment. Run npm test to run the full test suite. The full test suite will also be run automatically (as well as linting) when you push to the repo.

[arnog]

It's been a couple of years, so I'm assuming this has been abandonned.

[ShaMan123]

Yes, sorry