feat: custom ReorderableListView drag handle listeners

[ndonkoHenri]

Test Code

import flet as ft


def main(page: ft.Page):
    page.title = "ReorderableListView Demo"

    # the primary color is the color of the reorder handle
    page.theme = page.dark_theme = ft.Theme(
        color_scheme=ft.ColorScheme(primary=ft.Colors.BLUE)
    )
    get_color = (
        lambda i: ft.Colors.ERROR if i % 2 == 0 else ft.Colors.ON_ERROR_CONTAINER
    )

    page.add(
        ft.ReorderableListView(
            expand=True,
            build_controls_on_demand=False,
            on_reorder=lambda e: print(f"Reordered from {e.old_index} to {e.new_index}"),
            show_default_drag_handles=True,
            controls=[
                ft.ReorderableDraggable(
                    index=i,
                    content=ft.ListTile(
                        title=ft.Text(f"Item {i}", color=ft.Colors.BLACK),
                        leading=ft.Icon(ft.Icons.CHECK, color=ft.Colors.RED),
                        bgcolor=get_color(i),
                    ),
                )
                for i in range(10)
            ],
        )
    )


ft.app(main)

Summary by Sourcery

Adds the ability to customize drag handles in the ReorderableListView control by introducing the show_default_drag_handles and mouse_cursor properties.

New Features:

• Adds the ability to hide default drag handles in ReorderableListView.
• Adds the ability to customize the mouse cursor when hovering over drag handles in ReorderableListView.

Summary by Sourcery

Adds the ability to customize drag handles in the ReorderableListView control by introducing the show_default_drag_handles and mouse_cursor properties.

New Features:

• Adds the ability to hide default drag handles in ReorderableListView.
• Adds the ability to customize the mouse cursor when hovering over drag handles in ReorderableListView.