Flutter Gestures

Syntax

GestureDetector(
  child: // child widget,
  onTap: () { // action on tap },
  onDoubleTap: () { // action on double tap },
  onLongPress: () { // action on long press },
  onVerticalDragUpdate: (details) { // action on vertical drag update },
  onHorizontalDragUpdate: (details) { // action on horizontal drag update },
  // other gesture event callbacks
);

Example

GestureDetector(
  child: Container(
    height: 50,
    decoration: BoxDecoration(
      color: Colors.blue,
      borderRadius: BorderRadius.circular(10),
    ),
    child: Center(child: Text("Tap me!")),
  ),
  onTap: () {
    print("Tapped!"); // prints "Tapped!" on tap
  },
);

Output

Explanation

Flutter gestures are used to detect and respond to user gestures such as taps, double taps, drags, and long presses. The GestureDetector widget is used to detect these gestures and can be configured with various callback functions to handle the detected events. In the example above, we create a simple container with text inside and configure the onTap callback to print "Tapped!" to the console when the user taps on the container.

Use

Flutter gestures are useful when creating interactive user interfaces that require responses to user actions. They can be used for anything from simple button presses to complex drag and drop interactions. The GestureDetector widget is a core component in detecting these gestures and should be utilized whenever user interaction is required.

Important Points

• The GestureDetector widget can detect a variety of gestures including taps, double taps, drags, and long presses.
• Gesture callbacks can be added to the GestureDetector widget to handle detected events.
• Flutter gestures are essential for creating interactive user interfaces.

Summary

Flutter gestures provide a means of detecting and responding to user actions in a Flutter application. The GestureDetector widget is used to detect these gestures and can be configured with various callbacks to handle the detected events. They are essential for creating interactive user interfaces that require user input.