October 2019
Beginner
528 pages
12h 37m
English
Content preview from Beginning Flutter
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11Applying Interactivity
WHAT YOU WILL LEARN IN THIS CHAPTER
- How to use
GestureDetector, which recognizes gestures such as tap, double tap, long press, pan, vertical drag, horizontal drag, and scale. - How to use the
Draggablewidget that is dragged to aDragTarget. - How to use the
DragTargetwidget that receives data from aDraggable. - How to use the
InkWellandInkResponsewidgets. You will learn thatInkWellis a rectangular area that responds to touch and clips splashes within its area. You'll learn thatInkResponseresponds to touch and that splashes expand outside its area. - How to use the
Dismissiblewidget that is dismissed by dragging.
In this chapter, you'll learn how to add interactivity to an app by using gestures. In a mobile application, gestures are the heart of listening to user interaction. Making use of gestures can define an app with a great UX. Overusing gestures when they don't add value or convey an action creates a poor UX. You'll take a closer look at how to find a balance by using the correct gesture for the task at hand.
SETTING UP GESTUREDETECTOR: THE BASICS
The GestureDetector widget detects gestures such as tap, double tap, long press, pan, vertical drag, horizontal drag, and scale. It has an optional child property, and if a child widget is specified, the gestures apply only to the child widget. If the child widget is omitted, then the GestureDetector fills the entire parent instead. If you need to catch vertical drag and horizontal drag at the same ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.