File upload component
Usage examples:
<class name="App.Example">
<use name="Runtime.Widget.UploadFileButton" component="true" />
<template>
<UploadFileButton @event:file="this.onUploadFileClick(event.value)">
Click
</UploadFileButton>
</template>
<script>
void onUploadFileClick(var file)
{
var_dump(file);
}
</script>
</class>