If I create a home screen with a GridView of widgets containing images and descriptions, how could I make it so that when a user clicks on one of the widgets, the image in that widget animates over to the next screen? For example, if I have a chat app where users could chat with any other user they select in the GridView, the image from that selected widget would animate to the top of a chat screen for them to chat. I thought maybe this could be accomplished with a hero animation but I am not able to figure it out since the image widget would be nested inside a widget and then inside a GridView. It would be easy to pass the image URL through to the chat screen, which I may have to do, but I think the animation would make the UI flow much better. Any ideas?
You can do it, just make sure the hero tags between the two routes/pages match and that on any given page all the hero tags are unique. I have the same where the hero animates from a grid view into the next page's app bar.
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For ListView builder there is seperator to put ads in between the list of data. How do I do the same thing for PageView. While I scroll horizontally through this PageView, I want to show a native ad in between, how do I do it? Any links to implementation will be appreciated.
At first — I have a widget, it contains and plays a specific animation which state cannot be saved or interrupted because animation data comes from a web server permanently and this stream is important.
Second — I have a ListView.builder with 'infinite' list of Cards (simple cards, doesn't important in this situation, app's screen contains 5 of them at the same time).
The problem is: is it possible to set given animated widget on every 10-th position of the ListView using the same instance of it in order to save it's animation state and not recreate animated widget every time? It must be the same widget, the animation must continue — one widget's instance on the screen at the time.
I tried to use a Stack with the animated widget wrapped with Offstage widget on the upper layer and the ListView with 'gaps' on every 10-th position. So Animated widget lives permanently and when it goes out of the screen I 'turn it off' with Offstage. And when it should appear on scroll I 'switch it on' with Offstage. But it is very difficult to position animated widget and synchronize its position with a scroll position of the ListView. For this purpose I use a GlobalKey for every 'gap' in the ListView, define it's Render Rectangle to position my Animated widget on/in the given gap.
Any ideas to solve this task more elegant? Maybe it is possible to make some 'deep copy' or 'singleton' or keep it alive (somehow) in the ListView or use some slivers, and reuse the same instance of it again and again when it appears?
Here is an example from a mockup I made of what I am trying to achieve.
Right now in code, these are 2 separate screens, but they are simply using a regular built-in animation between screens. Where would I even start to begin achieving an animation like the mockup example? Could I use a Stack that has a circle as a background with a hero tag, and then change its radius? How could I guarantee it would fill the size of any screen?
Thank you!
It's quite simple, you can do it in 1 page, follow this:
Layer a full page popup menu widget (let's say the widgets on pink)
on the page 1 with Stack, hide it at initial.
Scale animation to the top left circle when pressing it
Show the hidden menu widget after scale animation
Hide and reverse the scale animation when pressing closing or back button
When you swipe vertically, image is dragged towards the swipe, with fading out animation of black background.
And after release, it smoothly returns to it's previous position on the screen, like Hero animation does.
How is it possible to recreate such an effect using Flutter? The same scenario, in fullscreen photo view.
photo_view package is desired for fullscreen, so it shouldn't interfere with zooming.
What you need is actually an out-of-the-box widget, and it's surprisingly easy to use. It's called Hero. Basically, you wrap the widget you want to animate like that in a Hero widget, with a specific tag string, and, when you navigate to another screen, you wrap the destination widget in another Hero with the same tag. An effect like the one you shared can be achieved by wrapping two widgets with the same photo with Heroes in different PageRoutes.
Check out this Flutter widget of the week video to get you started, and this Flutter.dev article for a more detailed explanation on Hero widgets.
Edit: I see you are looking for a more specific image-viewer behavior. Then, I suggest you use the photo_view package, which includes many functionalities to visualize images, including the hero transition with swipe-dow-to-dismiss behaviors, pinching to zoom, etc.
I found the solution.
To create such an animation, you should use extended_image package, which has SlideOutPage widget for creation of such transitions.
Basically I'm trying to build a game to learn flutter more.
Right now I'm just trying to get a Text widget to move from the top of the phone screen, towards the bottom of the phone screen... I'm building a Space Invaders type of game with just Text.
From what I've read by googling the problem, should I use Flame? Or can everything be done by just using the base Flutter framework (collision detection, moving widgets, etc...)? Thanks.
You can use Draggable class for dragging the item.
A simple way to solve this problem is to have the moving Text widget a child of the Stack() widget. Actually, the child of the Stack() widget is a Positioned() widget, which has left and top properties, which you can update periodically with a Timer.periodic function to move the widget down by incrementing top property. So, your Text widget is a child of the Positioned() widget, that you use for, well, positioning.
I have a working example of this in my slowly_moving_widgets_field project, where I have a bunch of arbitrary widgets moving about the screen every X seconds as you desire.