Taking the two icons volume_up and volume_down from https://material.io/resources/icons/?style=baseline
I want to achieve the same effect as the gif below in flutter.
To note, I am using bloc architecture so pretty much everything is Stateless and would prefer avoiding Stateful widgets.
The animation should be infinite duration.
I cannot figure out a simple way to essentially swap between two icons on an infinite loop using animations (and a plus would be for a nice fade in/out effect).
I thought about using a Timer and swapping between the two icons but that seems a rather basic hack for what should be a tried and tested functionality.
Does anyone have a code solution to achieve what the gif shows or can point me to an example doing the same thing?
Thanks.
Simply use AnimatedSwitcher switch between images and control the duration by Timer
AnimatedSwitcher
Related
I'm looking for a way to do frame-by-frame programmatically drawn animations in a MacOs application (not keyframe property animation). I have tried drawing to CALayers using the drawLayer:inContext: delegate method, calling setNeedsDisplay to draw each frame, however I'm getting poor performance doing it this way. Is there a recommended way to do this type of animation in Cocoa?
A good way to do entirely custom animations is by using CADisplayLink (iOS) or CVDisplayLink (macOS). CVDisplayLink is basically a timer that fires as often as the display refreshes.
You can then calculate your own timing functions based on the values you get off CVDisplayLink. The API is still C so it is a bit cumbersome to use, especially in Swift, but once you get how it functions it works like a charm.
I have only had good experiences with CVDisplayLink, especially with layers. They are really performant. I was able to animate 1000+ layers CVDisplayLink driven at 60fps without any problems.
If you need any help in using the API, feel free to ask!
Alternative:
If you want to use a more modern API, I can recommend SpriteKit. There are some nice animation APIs as well. And they perform really good. Apple uses it itself to draw more complex views (like the Memory Debugger in Xcode).
I would like to create a image and content slider in Flex. There are many jquery plugings available
(cfr. Flexslider http://flex.madebymufffin.com/) but i can't find an alternative for Flex.
Can anyone explain me how i can implement this?
Thanks!
Ah it just so happens I already made this... a long time ago so it's Flex 3 but I believe it works as is in Flex 4, I've integrated this with other Flex 4 projects and have since made some performance improvements (mainly opting for Group over Canvas and did some deferred instantation since we decided to use it as the backbone for a pretty complex site).
http://www.shaunhusain.com/ImageSlider/
http://www.shaunhusain.com/ImageSlider/srcview/index.html
Should allow you to drag and snaps to the tile with it's top left corner nearest the top left of the container itself, also can use keyboard navigation left right up down so long as it has focus, and I made those buttons on top that can be used to trigger the movements. Basically I tried to overload that example with all possible options so I can just copy it and strip off what I don't want. It also turns out this translates pretty well to touch screens even though I didn't own one when I wrote it, the snap to nearest thing works alright on an android (even with that version which is totally not optimized for mobile). Oh yeah and you can use - and + on the keyboard or the scroll wheel to zoom, doubt if that's really ever necessary but it seemed like a cool idea at the time.
I have been looking around to see css3 animations have some kind of callback, I.e is possible to animate an element, and once the element is finished animating, animate another?
Been bashing around google for hours to no avail, maybe my terminology is wrong?
CSS3 animations are not meant to replace JavaScript.
CSS is made purely for styling purposes with very minimal logic that does not "look back" (you cannot select a parent). CSS is handled on the spot and is triggered using a few browser triggers like :hover, :active, and :link.
CSS is supposed to be lightning fast, as it has no confusing or time-consuming logic that will slow down the browser.
That being said, callbacks aren't supported for the above reasons.
Take a Look at Apple's talk "CSS Effects, Part 2: Galleries and 3D Effects from WWDC 2010":
https://developer.apple.com/videos/archive/
You can provide a startdelay for your animation and there is some kind of transitionEndListener for webkit-based browser.
Coming from the iOS world where we have UIImageView and the property animationImages:
http://developer.apple.com/library/ios/documentation/UIKit/Reference/UIImageView_Class/Reference/Reference.html#//apple_ref/occ/instp/UIImageView/animationImages
Where animationImages is just an array of arbitrary animation frames. You specify the images (maybe 15), then set the total animation time (maybe 4 seconds) in one of the other properties, then just start the anim and the images in animationImages will play sequentially over the specified time with an even frame rate.
How would I do the same with WP7/Silverlight? This all Expression Blend seems wonderful, but I just can't find a way to animate the image source (I'm guessing it might be impossible). How would I do the same? Should I add a unique image object for each frame in the animation, then play around with visibility/opacity properties and manually have to create all the spaced out key frames? That sounds like a lot of extra work + overhead and not a nice way to go...
http://www.windowsphonegeek.com/articles/WP7-Animations-in-depthndash-Overview-and-Getting-Started
http://www.wearerighteous.com/wp7-development/xaml-animation-in-silverlight-for-windows-phone-7/
http://www.windowspresentationfoundation.com/?p=712
Try out these links. Especially the first one, I think the first one resolve all you doubts. In wp7 we can go for two options either XAML based (static) animations / or with the help of C# code. By using blend u can create all sot of static animation with out any issue. Here the animation is working on the basis of page frames. If u are interested in learning more about Animation try this too;
http://msdn.microsoft.com/en-us/library/cc189019(v=vs.95).aspx
You can actually animate the Image.Source property here's a tutorial.
Animating Images in WP7
I would like to create an effect than an image zooms up from a thumbnail size to full screen.
I am not sure what's the right steps to achieve this. Should I create a transparent full screen window and animate a layer on top of it?
Take a look at this CoreGraphics example. Specifically, take a look at the "grow" and "shrink" animations. That's how Apple does it, and that's what you'll want to do too.
Your solution of a transparent window with a CALayer inside is probably the best supported way to do it.
One thing that seems like it should be a good solution (at least it's the first thing I thought of when I wanted to do this) but isn't is NSView's enterFullScreenMode:withOptions:. If memory serves, it was originally meant to do what you're talking about here, but the animation was taken out and it generally doesn't work that well now.