Page transition animations in Flutter - UI Render Trace

Component - Page transition animations

This UI component shows how one screen smoothly changes to another using animations. It helps users see the change clearly and makes the app feel lively and natural.

Widget Tree

MaterialApp
└── Navigator
    ├── Page1 (Scaffold)
    │   ├── AppBar
    │   └── Center
    │       └── ElevatedButton
    └── Page2 (Scaffold)
        ├── AppBar
        └── Center
            └── Text

The app starts with a MaterialApp that manages navigation. The Navigator holds two pages: Page1 and Page2. Page1 has a button in the center. When pressed, it triggers a transition animation to Page2, which shows a simple text message.

Render Trace - 4 Steps

Step 1: MaterialApp

Step 2: ElevatedButton

Step 3: Navigator.push with PageRouteBuilder

Step 4: Page2 Scaffold

State Change - Re-render

Trigger:User taps the 'Go to Page 2' button on Page1.

Before

Page1 is visible with button.

→

After

Page2 is visible after sliding animation.

Re-renders:The Navigator rebuilds to show Page2 with animation; Page1 remains in the background until transition ends.

UI Quiz - 3 Questions

What happens when the button on Page1 is tapped?

A Page1 fades out and disappears immediately.

B Page2 appears instantly without animation.

C Page2 slides in from the right over Page1.

D The app closes.

Key Insight

Using animated page transitions helps users understand navigation flow and makes the app feel smooth and polished. Flutter's Navigator with PageRouteBuilder allows easy customization of these animations.