Codestin Search App

ndonkoHenri · 2026-02-11T10:50:39Z

Test code

import flet as ft


def main(page: ft.Page):
    page.padding = 0

    page.add(
        ft.PageView(
            expand=True,
            viewport_fraction=0.9,
            on_change=lambda e: print(f"Currently viewing page {int(e.data)}"),
            selected_index=1,
            horizontal=True,
            controls=[
                ft.Container(
                    bgcolor=ft.Colors.INDIGO_400,
                    content=ft.Column(
                        alignment=ft.MainAxisAlignment.CENTER,
                        horizontal_alignment=ft.CrossAxisAlignment.CENTER,
                        controls=[
                            ft.Text("Welcome", size=40, weight=ft.FontWeight.BOLD),
                            ft.Text("Swipe to see what PageView can do."),
                        ],
                    ),
                ),
                ft.Container(
                    bgcolor=ft.Colors.PINK_300,
                    content=ft.Column(
                        alignment=ft.MainAxisAlignment.CENTER,
                        horizontal_alignment=ft.CrossAxisAlignment.CENTER,
                        controls=[
                            ft.Icon(ft.Icons.ANIMATION, size=72),
                            ft.Text(
                                "Viewport fraction lets you peek at the next slide."
                            ),
                        ],
                    ),
                ),
                ft.Container(
                    bgcolor=ft.Colors.TEAL_300,
                    content=ft.Column(
                        alignment=ft.MainAxisAlignment.CENTER,
                        horizontal_alignment=ft.CrossAxisAlignment.CENTER,
                        controls=[
                            ft.Icon(ft.Icons.TOUCH_APP, size=72),
                            ft.Text("Use on_change to respond to page swipes."),
                        ],
                    ),
                ),
            ],
        ),
    )


if __name__ == "__main__":
    ft.run(main)

Summary by Sourcery

Introduce a new PageView control for swipable, paginated content and wire it into the Flutter and Python Flet runtimes.

New Features:

Add a PageView layout control to the Python SDK with paging configuration and programmatic navigation APIs.
Implement the corresponding Flutter PageViewControl widget and register it in the Flet core extension for runtime support.

Enhancements:

Expose PageView from the Python flet package and add its user documentation page to the mkdocs navigation.
Provide basic and programmatic-swipe PageView examples and an integration screenshot test to validate rendering.
Fix a small formatting issue in the Badge control documentation string.

…ults

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Pull request overview

Introduces a new PageView control to the Flet Python SDK with corresponding Flutter (Dart) implementation, documentation, examples, and an integration golden test.

Changes:

Added PageView control implementation in Python and registered it in the public API.
Added Flutter-side PageViewControl and wired it into the control factory.
Added docs, examples, and an integration test with a golden screenshot.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sdk/python/packages/flet/src/flet/controls/material/badge.py	Minor docstring formatting fix.
sdk/python/packages/flet/src/flet/controls/core/page_view.py	New Python `PageView` control API, validation, and invoke methods.
sdk/python/packages/flet/src/flet/init.py	Exposes `PageView` from the top-level `flet` package.
sdk/python/packages/flet/mkdocs.yml	Adds `PageView` to the documentation navigation.
sdk/python/packages/flet/integration_tests/controls/core/test_page_view.py	Adds an integration screenshot test for `PageView`.
sdk/python/packages/flet/integration_tests/controls/core/golden/macos/page_view/basic.png	Adds macOS golden image for the integration test.
sdk/python/packages/flet/docs/controls/pageview.md	Adds `PageView` documentation page and example includes.
sdk/python/examples/controls/page_view/basic.py	Adds a basic usage example for `PageView`.
sdk/python/examples/controls/page_view/programmatic_swipe.py	Adds an example demonstrating programmatic page changes.
packages/flet/lib/src/flet_core_extension.dart	Registers the new `PageView` control in the Dart control factory.
packages/flet/lib/src/controls/page_view.dart	Implements the Flutter `PageViewControl` widget and method handling.

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Copilot · 2026-02-11T11:00:29Z

packages/flet/lib/src/controls/page_view.dart

+    } else if (newSelectedIndex != _selectedIndex &&
+        _pageController.hasClients) {
+      _selectedIndex = newSelectedIndex;
+      _pageController.jumpToPage(newSelectedIndex);


In didUpdateWidget(), when selected_index changes but _pageController.hasClients is false, the new index is ignored and _selectedIndex is not updated. This can leave the widget displaying a different page than the control property if selected_index is updated before the controller attaches. Consider always updating _selectedIndex and either (a) recreating the controller when hasClients is false, or (b) scheduling a jumpToPage() in a post-frame callback once the controller attaches.

Suggested change

} else if (newSelectedIndex != _selectedIndex &&

_pageController.hasClients) {

_selectedIndex = newSelectedIndex;

_pageController.jumpToPage(newSelectedIndex);

} else if (newSelectedIndex != _selectedIndex) {

_selectedIndex = newSelectedIndex;

if (_pageController.hasClients) {

_pageController.jumpToPage(newSelectedIndex);

} else {

WidgetsBinding.instance.addPostFrameCallback((_) {

if (!mounted || !_pageController.hasClients) {

return;

}

_pageController.jumpToPage(_selectedIndex);

});

}

Copilot · 2026-02-11T11:00:29Z

sdk/python/packages/flet/src/flet/controls/core/page_view.py

+__all__ = ["PageView"]
+
+
+DEFAULT_ANIMATION_DURATION = Duration(seconds=1)


DEFAULT_ANIMATION_DURATION is a mutable Duration instance that’s reused as the default argument value in go_to_page(), next_page(), and previous_page(). Mutable default arguments can be modified accidentally and then affect subsequent calls. Prefer using None defaults (and assigning Duration(seconds=1) inside the method) or using an immutable default such as an int milliseconds value.

Suggested change

DEFAULT_ANIMATION_DURATION = Duration(seconds=1)

DEFAULT_ANIMATION_DURATION: DurationValue = 1000 # 1 second in milliseconds

sdk/python/packages/flet/docs/controls/pageview.md

cloudflare-workers-and-pages · 2026-02-11T14:52:51Z

Deploying flet-docs with Cloudflare Pages

Latest commit:	`10167db`
Status:	⚡️ Build in progress...

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cloudflare-workers-and-pages · 2026-02-11T14:54:29Z

Deploying flet-examples with Cloudflare Pages

Latest commit:	`10167db`
Status:	✅ Deploy successful!
Preview URL:	https://2766d227.flet-examples.pages.dev
Branch Preview URL:	https://pageview.flet-examples.pages.dev

View logs

Switch page view animations to ft.AnimationCurve.BOUNCE_OUT and shorten animation_duration from 3s to 1s for both show_previous_page and show_next_page in sdk/python/examples/controls/page_view/programmatic_swipe.py to make transitions quicker and use a bounce-out easing.

ndonkoHenri added 8 commits November 23, 2025 05:37

initial commit

1dd642e

tests

c60e36c

docs

758b740

example

1a15339

replace current_page and initial_page by selected_index

0fe4602

Merge branch 'main' into pageview

085d451

refactor: Simplify page navigation methods and improve animation defa…

77479be

…ults

Merge branch 'main' into pageview

9879389

ndonkoHenri requested review from FeodorFitsner and Copilot February 11, 2026 10:50

ndonkoHenri linked an issue Feb 11, 2026 that may be closed by this pull request

feature: PageView control #5248

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Copilot started reviewing on behalf of ndonkoHenri February 11, 2026 10:51 View session

sourcery-ai bot reviewed Feb 11, 2026

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Copilot AI reviewed Feb 11, 2026

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chore: Add dependency override for flet in pubspec

4681c39

FeodorFitsner approved these changes Feb 12, 2026

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FeodorFitsner merged commit cf8f743 into main Feb 12, 2026
43 of 48 checks passed

FeodorFitsner deleted the pageview branch February 12, 2026 22:04

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feat: `PageView` control#6158

feat: `PageView` control#6158
FeodorFitsner merged 10 commits intomainfrom
pageview

ndonkoHenri commented Feb 11, 2026 •

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		__all__ = ["PageView"]


		DEFAULT_ANIMATION_DURATION = Duration(seconds=1)

	DEFAULT_ANIMATION_DURATION = Duration(seconds=1)
	DEFAULT_ANIMATION_DURATION: DurationValue = 1000 # 1 second in milliseconds

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Pull request overview

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ndonkoHenri commented Feb 11, 2026 •

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