Скачать или смотреть How to Prevent TextField Focus on Long Press in Flutter

Discover how to control `TextField` focus behavior in Flutter, allowing for seamless drag-and-drop functionality without unnecessary keyboard interruptions.
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This video is based on the question https://stackoverflow.com/q/71481680/ asked by the user 'Andrew' ( https://stackoverflow.com/u/18472049/ ) and on the answer https://stackoverflow.com/a/71481992/ provided by the user 'Taqi Tahmid Tanzil' ( https://stackoverflow.com/u/6748623/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing TextField Focus Behavior in Flutter

As a Flutter developer, you might encounter scenarios where you need to control the focus behavior of a TextField. For instance, suppose you're building an application that allows users to reorder elements by long-pressing and drag-dropping them. Having a TextField focused and the keyboard appearing during a long press can disrupt the reordering process. In this guide, we will explore a solution to ensure that the TextField only gets focused on a simple tap, preventing it from focusing on a long press.

The Problem Context

You want to implement functionality where:

Users can long-press an element to initiate a drag-and-drop action.

Avoid the TextField gaining focus, which consequently brings up the keyboard, during the long press.

Ensure that the TextField only receives focus when it is tapped normally.

This can be a common issue in user interface design, especially in mobile applications where multiple gestures can occur simultaneously.

The Solution

To solve this problem, we can use the GestureDetector widget in Flutter, which allows us to listen to various gestures for a widget. Here's how you can implement this functionality step-by-step.

Step 1: Set Up State Management

You need a way to track whether the TextField should be focused or not. You can achieve this using a boolean variable.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Wrap TextField in GestureDetector

Next, you will wrap your TextField in a GestureDetector. This allows you to define behavior for tap and long press gestures.

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code

GestureDetector: This widget recognizes various gestures and allows us to execute specific actions on those gestures.

onTap: When the user taps the TextField, it sets isFocused to true, which makes the TextField editable.

onLongPress: When the user long-presses, it sets isFocused to false, preventing the TextField from being editable and avoiding the keyboard from popping up.

TextFormField: This is your actual text input field. By setting readOnly to isFocused, we can control its editable state based on the gestures.

Step 3: Take Full Advantage of Flutter State Management

Make sure your isFocused state is declared in a StatefulWidget to allow for reactivity. When the state changes (due to tap or long press), the widget rebuilds accordingly.

Conclusion

By wrapping your TextField in a GestureDetector and controlling the isFocused state, you can easily circumvent the problematic keyboard appearance while enabling a smooth long press functionality for dragging and dropping elements.

This technique not only enhances the user interface experience but also maintains the intended design of your application. Implement this change to finely control the focus behavior of your TextField, allowing for more intuitive user interactions.

Feel free to experiment with this solution and adapt it to your own application needs!