# Class to show how to handle drop events in the bin view
from hiero.core.events import *

class BinViewDropHandler:
    kTextMimeType = "text/plain"

    def __init__(self):
        # Hiero doesn't deal with drag and drop for text/plain data, so tell it to allow it.
        hiero.ui.registerBinViewCustomMimeDataType(BinViewDropHandler.kTextMimeType)

        # Register interest in the drop event now.
        registerInterest((EventType.kDrop, EventType.kBin), self.dropHandler)

    def dropHandler(self, event):
        # Get the mime data.
        print('mimeData: {}'.format(event.mimeData))

        # Fast and easy way to get text data.
        if event.mimeData.hasText():
            print('mimeData as text: ', event.mimeData.text())

        # More complicated way of getting text data.
        if event.mimeData.hasFormat(BinViewDropHandler.kTextMimeType):
            byteArray = event.mimeData.data(BinViewDropHandler.kTextMimeType)
            print('mimeData data as a string: {}'.format(byteArray.data().decode('utf-8')))

            # Signal that we've handled the event here.
            event.dropEvent.accept()

        # Get custom Hiero objects if drag from one view to another.
        # Ths is only present if the drop was from one Hiero view to another.
        if hasattr(event, "items"):
            print('mimeData has items: {}'.format(event.items))

        # Figure out which item it was dropped onto.
        print('mimeData drop item: {}'.format(event.dropItem))

        # Get the widget that the drop happened in.
        print('mimeData drop widget: {}'.format(event.dropWidget))

        # Get the higher level container widget (for the Bin View, this will be the Bin View widget).
        print('mimeData container widget: {}'.format(event.containerWidget))

        # Can also get the sender.
        print('mimeData event sender: {}'.format(event.sender))

    def unregister(self):
        unregisterInterest((EventType.kDrop, EventType.kBin), self.dropHandler)
        hiero.ui.unregisterBinViewCustomMimeDataType(BinViewDropHandler.kTextMimeType)


# Instantiate the handler to get it to register itself.
dropHandler = BinViewDropHandler()