To avoid spurious flailing of things "in the morning" of my list, I used a ref that switches to false after the first processing run.įlipper and Flipped are the foundational components of react-flip-toolkit.įlipper serves as your FLIP animation container. An example to the contrary would be a landing page with a beautifully orchestrated opening sequence. For me animation must enhance the experience and not slow you down from getting the information you want. This depends on the situation and is a matter of personal taste, but usually I don't like things to transition on first render. In theory useEffect can be used here too, but it's unreliable, especially in situations when things are being added/removed from lists. You can see how this hook lets you access to the DOM in a perfect moment for the Invert step. Updates scheduled inside useLayoutEffect will be flushed synchronously, before the browser has a chance to paint. Use this to read layout from the DOM and synchronously re-render. The signature is identical to useEffect, but it fires synchronously after all DOM mutations. To keep the code short, I focused on handling only a case of a list. So how to implement this? I gave it a shot using React hooks. The element movement can be achieved in multiple ways, e.g.: We use this to compute the differences as shown.įinally, we make the element move and let the browser paint. That means getting the boundingClientRect of the element will give us the information about its final state. In this stage, we need to be after browser layout but before browser paint. We need to store the boundingClientRect of the element and resize and/or reposition it to the target location. The First is the element before the transition and Last is where we want it to go. The stepsĪ short illustration of how the process goes: First and Last To achieve all this, we get the boundingClientRects of the element's initial and final state, apply a CSS transform to it and run the whole thing by applying a transition on the transform. To avoid that, we pre-calculate the transition that needs to happen before the browser has a chance to paint and then let it run smoothly. Using a transition on dimensional properties ( width, height, margin, padding, top, left etc.) with CSS comes with a penalty, since the browser has to recalculate the layout on every frame. Not all transitions have been created equal. They reduce the cognitive load on the user, help avoid change blindness and guide focus to what's important Problems and solutions Purposefully designed animations also help with usability. It's a delight to see the contents of an application behave as they would in the real world. Even lightning arcs and branches along a beautiful path dictated by conductivity, looking for the easiest route to connect the ground with the sky. To illustrate to yourself the importance of purposeful transitions, consider that nothing in nature changes state discretely. In my experience they are often underestimated as an integral part of a design. If you watched it, you can skip to the code section.Īnimations bring an application to life. LICENSEĬode taken directly from SDL2 and SDL2_ttf should keep the same License with SDL2 and SDL2_ttf.Ĭode modified by myself should use Apache-2.0.I made a short video introducing the topic: Paying extra thousands of dollars (for buying a Mac) to gain the right for developing apps for my own mobile device is ridiculous. Wanna an iOS version? Just buy your closed-source Tesla! I am not interested in users of closed-source systems. So I just write some Android.mk files for building. The original FlipClock uses Meson, but we cannot use Meson when building Android APP. The original FlipClock was used as a git submodule here to keep code clean, because we need to build SDL2 and SDL2_ttf's source inside this project (that's bad, but it's the only way). Java shim was taken directly from SDL2's android-project subdir and I won't modify them to keep consistnt with upstream. When the APP started, 2 fingers touch/double tap to switch between 12/24-hour clock format, 3 fingers touch to toggle second, rotate your phone to switch between landscape and portrait, don't forget to enable your phone's auto-rotate option. Open this project with Android Studio and try to build by yourself. Modern phones with non-square screens use OLED, and displaying similar patterns (FlipClock is one of those) will leave permanent mark on OLED screen.Ĭlone this repo, then run git submodule update -init to get FlipClock, then the font symlink under assets should work, if not, run ln -s app/jni/flipclock/dists/flipclock.ttf app/src/main/assets/flipclock.ttf. FlipClock Android The Android wrapper for FlipClock.įliqlo, the closed-source app for macOS has an iOS version, so I tried to make an Android version.
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