Flutter-widget Questions

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Child Property in Stateful Widget

I've made some test widgets to illustrate a point that i'm having difficulty with in a much more complicated widget. i have the following
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Class to Class Access Data

I have a problem with classes. i keep the user data in user_info_screen with google auth. how can i pull this user data in a class that has this

How to get size of a child Widget

I have a special requirement to allow for a header widget, usually containing static content to appear at the top of a scroll view. the scroll

Widget isn't a type

When i create a new widget then uper widget shows error. widget isn't a type.
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How to create a wave widget?

How to create a widget for displaying waves with custom color and blur effect in flutter? i want something like this:
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Flutter popup widget

I have a flutter app screen where i'm listing search results, on the right top i have a search icon when clicked on it i want to open a popup

Stateless Vs Stateful rebuild

When a stateless widget is inside a stateful widget it will redraw or not? now the stateless widget can't be redrawn at run time but stateful can.
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Flutter Text Widget

I have a simple screen with three text widgets and when the user click on one of these text widget that text should turn black font text color and
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How do I align these widgets?

I am making a practice app in flutter and stuck on this: how can i align widgets such that; 1. an icon stays at extreme left of appbar 2. text
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