Scheduler drag and drop with mobile support

[V45370]

All issues should be resolved now. Tested touch support on Android and on Chrome dev tools for mobile.
Had to use DragDropTouch.js with a little modification described here
It is currently added as a separate DragDropTouch.js file, but you might want to integrate it inside Radzen.Blazor.js

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[akorchev]

Had to use DragDropTouch.js with a little modification described Postlagerkarte/blazor-dragdrop#147 (comment)

I am afraid we can't accept a PR that introduces a third party js dependency. And just including the file in Radzen.Blazor.js isn't an option either - both license wise and size-wise. Radzen already includes drag and drop implementations and we don't want another one - RadzenSlider, RadzenColorPicker and RadzenDialog use drag and drop.

[V45370]

In this case, I will investigate further

[akorchev]

I think HTML5 drag and drop works out of the box on latest mobile devices. That's what this page claims https://caniuse.com/dragndrop

Perhaps the implementation you suggested needs a little tweaking to make it work on a mobile device (without a polyfil or a brand new drag and drop implementation).

[V45370]

Thanks for the suggestion. I will look into it. However the reason I decided to use the third-party implementation was because, it fixes the ontouchend event firing and the dragging animation.
Does it mean that I need to figure a way without modifying the Radzen.Blazor.js or I can add a method or two if needed?

[akorchev]

You can add a method or two if needed to Radzen.Blazor.js. Also check if some of the existing code would help - there is drag and drop in the splitter, datagrid, slider, dialog etc.

[akorchev]

I think I've completed the implementation - removed touch events and the polyfill. It seems setting ondragstart as a string was the only thing required to enable drag and drop on mobile devices.