Flutter Tutorial - How To Enable and Disable Button

How to enable and disable a button after first click in Flutter, also disable any Flutter button if the textfield is empty. Finally, set the disabled button color in Flutter.
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TIMELINE
0:00 Introduction Enable / Disable Button
0:11 Disable Button
0:21 Set Disabled Button Color
0:34 Disable Button After First Click
1:17 Enable/Disable Button If TextField Is Empty
2:42 Disable TextButton / Disable Elevated Button

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