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| 1 | +#!/usr/bin/env python3 |
| 2 | +import asyncio |
| 3 | +from dataclasses import dataclass |
| 4 | +from functools import partial |
| 5 | +from typing import Optional, Tuple |
| 6 | + |
| 7 | +from nicegui import app, ui |
| 8 | + |
| 9 | + |
| 10 | +@dataclass |
| 11 | +class ToDo: |
| 12 | + title: str |
| 13 | + |
| 14 | + |
| 15 | +@ui.page('/') |
| 16 | +def main(): |
| 17 | + def make_droppable_column(name: str) -> ui.column: |
| 18 | + col = ui.column().classes('bg-blue-grey-2 w-60 p-4 rounded shadow-2') |
| 19 | + with col: |
| 20 | + ui.label(name).classes('text-bold ml-1') |
| 21 | + col.on('dragover.prevent', partial(on_dragover, col)) |
| 22 | + col.on('dragleave', partial(on_dragleave, col)) |
| 23 | + col.on('drop', partial(on_drop, col, name)) |
| 24 | + return col |
| 25 | + |
| 26 | + def make_draggable_card(todo: ToDo) -> ui.card: |
| 27 | + card = ui.card().props('draggable').classes('w-full cursor-pointer bg-grey-1') |
| 28 | + with card: |
| 29 | + ui.label(todo.title) |
| 30 | + card.on('dragstart', partial(on_dragstart, card, todo)) |
| 31 | + return card |
| 32 | + |
| 33 | + def on_dragstart(card: ui.card, todo: ToDo) -> None: |
| 34 | + app.storage.tab['dragging-todo'] = (card, todo) |
| 35 | + |
| 36 | + def on_dragover(col: ui.column) -> None: |
| 37 | + col.classes(remove='bg-blue-grey-2', add='bg-blue-grey-3') |
| 38 | + |
| 39 | + def on_dragleave(col: ui.column) -> None: |
| 40 | + col.classes(remove='bg-blue-grey-3', add='bg-blue-grey-2') |
| 41 | + |
| 42 | + async def on_drop(tgt_col: ui.column, col_name: str) -> None: |
| 43 | + dragging: Optional[Tuple[ui.card, ToDo]] = app.storage.tab.get( |
| 44 | + 'dragging-todo', None |
| 45 | + ) |
| 46 | + if not dragging: |
| 47 | + return |
| 48 | + (card, todo) = dragging |
| 49 | + del app.storage.tab['dragging-todo'] |
| 50 | + tgt_col.classes(remove='bg-blue-grey-3', add='bg-blue-grey-2') |
| 51 | + if not card.parent_slot: |
| 52 | + return |
| 53 | + src_col = card.parent_slot.parent |
| 54 | + if tgt_col == src_col: |
| 55 | + # no change, nothing to do |
| 56 | + return |
| 57 | + src_skel = ui.skeleton().classes('w-full') |
| 58 | + if False: |
| 59 | + # This might benefit from a new ui.column.replace(old_element, new_element) |
| 60 | + src_col.replace(card, src_skel) |
| 61 | + else: |
| 62 | + src_idx = card.parent_slot.children.index(card) |
| 63 | + src_skel.move(src_col, src_idx) |
| 64 | + card.parent_slot.children.remove(card) |
| 65 | + tgt_skel = ui.skeleton().classes('w-full') |
| 66 | + tgt_skel.move(tgt_col) |
| 67 | + |
| 68 | + await asyncio.sleep(1.0) |
| 69 | + |
| 70 | + src_col.remove(src_skel) |
| 71 | + if False: |
| 72 | + # This might benefit from a new ui.column.replace(old_element, new_element) |
| 73 | + tgt_col.replace(tgt_skel, card) |
| 74 | + else: |
| 75 | + tgt_idx = tgt_col.default_slot.children.index(tgt_skel) |
| 76 | + tgt_col.remove(tgt_skel) |
| 77 | + tgt_col.default_slot.children.insert(tgt_idx, card) |
| 78 | + card.parent_slot = tgt_col.default_slot |
| 79 | + ui.notify(f'"{todo.title}" is now in {col_name}') |
| 80 | + |
| 81 | + with ui.row(): |
| 82 | + with make_droppable_column('Next'): |
| 83 | + make_draggable_card(ToDo('Provide Deployment')) |
| 84 | + with make_droppable_column('Doing'): |
| 85 | + make_draggable_card(ToDo('Improve Documentation')) |
| 86 | + with make_droppable_column('Done'): |
| 87 | + make_draggable_card(ToDo('Invent NiceGUI')) |
| 88 | + make_draggable_card(ToDo('Test in own Projects')) |
| 89 | + make_draggable_card(ToDo('Publish as Open Source')) |
| 90 | + make_draggable_card(ToDo('Release Native-Mode')) |
| 91 | + |
| 92 | + |
| 93 | +ui.run() |
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