How to set Flutter default elevations - flutter

How can I set default elevations to zero for all flutter widgets e.g. including DropdownButton and RaisedButton?
I want to create a flat color app.

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Change contrast with slider in flutter

I want centralise contrast theme with change according to slider value.
I want do as like

Flutter Custom Horizontal Slider

I want to make a Slider with customized lines with Flutter.
In a section where users choose distance,
It should have lines 0-15-50-500. Is there a way to this?

how to add Alternate labels in Flutter Stepper?

Is there a way to add alternate labels to the stepper in flutter, as shown below.
https://material.io/archive/guidelines/components/steppers.html#steppers-types-of-steppers

Is there any Possibility to customize a Flutter Slider?

I want to Add Flutter slider in My Cricket App(App For Live Score Cricket). Is there any Possibility to customize a Flutter Slider?
if then what will be?
There are several things that can easily be customized in Slider. I would suggest playing around with in on DartPad and try the activeColor and inactiveColorproperties, and wrapping it with a SliderTheme. The SliderTheme allows you to define custom SliderThemeData:
This theme is for both the Slider and the RangeSlider. The properties that are only for the Slider are: tickMarkShape, thumbShape, trackShape, and valueIndicatorShape.

Change value of a Text widget (NOT TextField)

I am trying to set up a text widget in my flutter app, and have the value change based on other widgets.
I can only find tips on how to change a TextField, but I don't want this to be editable by the user, only by code.
I can't set the data value of the widget, because it's final.
Is there any way to make this work in Flutter?