I want to know to the best way in order to develop a widget/view which can work as instagram, snapchat stories which illustrated in image below. There are many depndencies for android, but can't find any for flutter.
I'm thinking to use carousal/viewpager to move between stories of different users, but I'm unable to get how to move backward and forward in between stories of single user(either image or video) with progress bar on top of it which will move automatically to next when progress bar completes.
Try to create a custom ViewPager perhaps using Stack + Transform and use GestureDetector to switch between pages/stories.
I know this question has been asked for a long time, but for those who still ask the same question, you can use this library: https://pub.dev/packages/story_view or look at it's source to implement the same thing.
Not sure if you also want to give the user a chance to manually switch to the next image.
Here are some basic ingredients you want to use for an animated "story":
AnimationController with duration depending on the number of images in the story. Start the animation to go through the images and to animate the progress bar. The animation controller usually has a range from 0.0 to 1.0. Let's say you have 5 images. You would display the first image from 0.0 to 0.2, the second image from 0.2 to 0.4...
AnimatedBuilder that listens to the animation controller. The content inside the animation builder will be rebuilt every frame while the animation runs. Inside of the builder, calculate which image must be shown.
CustomPaint to manually draw a progress bar with sections for the single image. Pass the current animation value and the number of images to your CustomPainter.
Image widget to draw the image.
Related
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
I have an image in one page of the PageView. I want to animate this image to the next page when i go to it, sort of like when you use Hero animations in navigator page transitions. Any ideas how this can be achieved?
In order to achieve an animation similar to the hero animation. Basically what we will implement is this, you will need 5 elements:
The initial global coordinates
The final coordinates
Initial widget size
Final widget size
The widget you want to animate
Now in order to create this animation that spans the 2 screens we will need to use the overlay that is present in flutter. link
Add to the Overlay the widget that is to be animated (Not the widget present on the screen, a new instance).
Position this overlay entry to be in the starting coordinate of the animation (The original widget's position).
Hide the original widget.
Create an animation that changes the x and y coordinates to the create the custom motion, this can be any curve, the simplest being a simple tween between the starting coordinate and the end coordinate.
Another animation that animates size change between the start and end size. This animation can be combined with the previous one. (One tween animation but the values are calculated manually)
After the animation is done, remove the overlay entry, and show the new widget. (This can be done as a timed operation or as a call back operation)
This is the most flexible between all of the available options since you have access to the widget in all of its states. However you must be very careful when using this method as it might cause a slowdown if not properly implemented.
This packages does what you want https://pub.dev/packages/coast
It is essentially taking the same approach as Flutter’s Hero and HeroController: Detect when a transition is started, search through the element trees of the source and target pages for the widgets marked for animation (heroes, crabs), pair them up based on their tags, and finally create an entry in an Overlay whose position and size is the interpolation between those on the source and target pages.
Hello all I am building Tinder like swipe in Flutter. So far so good I have made the stack of cards together with the gesture detector when the user swipes left/right. However my issue come when I try to animate on click of a button. Under the stack of cards there are 2 buttons which you can like or dislike on button click. I would like to get an advice how I can approach the animation when the user clicks on either button. Below is my code for displaying the stack. Best wishes
There are several options to animate the card off screen. Since you're already using a Stack, AnimatedPosition is probably the best option.
You could also use Transform.translate to set the transform property of an AnimatedContainer. Or, if you want more control over the animation you could use a SlideTransition.
For a good overview of how to decide which animations you need, see this video from two days ago: https://www.youtube.com/watch?v=GXIJJkq_H8g
There's also https://pub.dev/packages/animations for more pre-packed options.
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.
What would be the best way to accomplish the home screen folder roll-open effect with views in Objective C?
I tried something similar to what MaxFish has described. You can check it here iOS Open Folder Animation Sample Code
If you take a look at the images inside the Springboard.app in your iPhone in "/System/Library/CoreServices" you can have an idea of how the animation works.
A simple version of the effect can be done this way:
Take a screenshot of the screen you want to "cut" and save it in an image
Create two imageviews each of which has a part of the screenshot (e.g. the first has the first upper part of the image as background, the second the rest), you could alternative use the same background image for both views, you have only to play with content alignments.
Place the two views on the original screen in the exact position to make them seem like one entire image perfectly aligned with the original screen.
Create a view (folder content) with its own background and whatever you want to put inside, place it at the same Y of the bottom imageview but beneath it.
Make the bottom image view scroll down for the entire size of the content view, you will see the folder content appear.
iOS version put on the sliding images some nice borders and applies fade effect which make the overall animation really cool. You can sure try and make it nice looking.
Hope this helps