fix: WindowDragArea dragging delays

[ndonkoHenri]

Fix #5193

Example

import time

import flet as ft


def main(page: ft.Page):
    page.window.title_bar_hidden = True
    page.horizontal_alignment = page.vertical_alignment = "center"

    def handle_click(e: ft.Event[ft.Button]):
        start = time.time()
        page.window.maximized = not page.window.maximized
        page.update()
        print(f"{e.control.content}: {time.time() - start:.5f}")

    page.add(
        ft.WindowDragArea(ft.Button(content="With WDA", on_click=handle_click)),
        ft.Button(content="Without WDA", on_click=handle_click),
    )


ft.run(main)

Summary by Sourcery

Improve WindowDragAreaControl responsiveness by separating dragging from double-tap detection, implement custom pointer‐based double-tap maximize/unmaximize, and add a utility distance method to Offset in the Python SDK.

New Features:

• Add manual double-tap detection to WindowDragAreaControl to toggle window maximization

Enhancements:

• Convert WindowDragAreaControl to a StatefulWidget and separate drag and pointer listeners for smoother dragging
• Trigger drag_start and drag_end events consistently via the updated GestureDetector

Chores:

• Introduce a distance property on the Python Offset class for magnitude calculation

[sourcery-ai]

We've reviewed this pull request using the Sourcery rules engine

[Copilot]

Pull Request Overview

This PR refactors the WindowDragArea control to use manual double-tap detection and adds a distance property to Python's Offset class for calculating Euclidean distance.

• Replaced GestureDetector.onDoubleTap with custom double-tap detection using Listener and pointer events
• Converted WindowDragAreaControl from StatelessWidget to StatefulWidget to track tap timing and position
• Added distance property to Python's Offset class to provide parity with Flutter's Offset API

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/python/packages/flet/src/flet/controls/transform.py	Adds a distance property to the Offset class that calculates the Euclidean distance from the origin using the standard formula (x² + y²)^0.5
packages/flet/lib/src/controls/window_drag_area.dart	Refactors WindowDragArea to use StatefulWidget with manual double-tap detection via Listener, tracking tap timing and position to determine when maximize/unmaximize should trigger based on Flutter's double-tap thresholds

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