I'm using a List inside of InfiniteLoader. Is it possible to animate the scroll to a specific element that's been loaded?
I think the animation is important as it gives the list time to calculate the height of each row.
I've tried using scrollToPosition on the list but it doesn't calculate the rows above. So when the use scroll up, the items jump about.
Related
I am using React Transition Group to animate in/out some list items, example: https://codesandbox.io/s/43v5wj62q9?file=/styles.css
However I need to smoothly animate the list height whenever a list item is added/deleted, right now it just snaps to its intrinsic height without a smooth transition.
Is there a way to achieve this?
I'm implementing a carousel and I want to target the element at the center of the slider. So, I can make it pop a little.
How can I target this component? I have found ways to know if the element is inside the viewport or not but I want to know if it's horizontally centered.
Original Problem
Horizontal scroll and set state
Since you have no code my answer will be more theoretically how to do it.
So first off you should have a boolean state that you can toggle for the active state. This state should be controlled by the container. That way you can only activate one at a time.
Next you should get 2 values, the X scroll position of the container and the center point of the visible area of the gallery.
Then you can just calculate an offset on mount and then X scroll of the gallery.
So in theory it starts at 0 and your container is 500px you know that the active slide is at the 250px mark so you can calculate that with the position of the slide, it should be the last slide that passed that point. then just recalculate this value on scroll. (maybe throttle)
Possibly able to use react-hook-inview
I've used this react hook before on the Y axis. I'm not 100% sure that it works on the X scroll. But it can be a great way to trigger a state change on each of the slides. The only issue is that you'll be adding a event listener to each of your slides (possible performance hit).
You can see that lib here
This one lets each slide control it's own inView state.
I have a bunch of div elements and in want to know if the scroll is at a particular element I am using a custom scrollbar implementation(react-custom-scrollbars).
Here's the working code.
https://codesandbox.io/s/7j28kmoy86
Referring to this question and answer by Shai Almog:
Rebuild list of containers without scrolling the list
I have a form with one container (TableLayout), which contains several rows with labels and buttons. Clicking a button changes the order of the rows and rebuilds the whole form (after myForm.removeAll() ). After myForm.revalidate() the form jumps to the top.
I am trying to implement this exact behaviour, to return to the same point (scroll position Y) after revalidating/changing the container contents.
I subclassed the Container-class to make setScrollY(int) visible. Using this with an arbitrary value does not scroll to the position, so it seems that the setScrollY method is not changing the scroll position of the content pane overall.
And myContainer.getScrollY() always returns "0". I only get the scroll position by calling getContentPane().getScrollY().
But it is obviously not possible to call the setScrollY()-method on the content pane - as it is not possible to subclass the content pane - to scroll back to the same position after revalidating the form.
Thanks for any advice!
Use border layout which disables the scrolling of the form/content pane.
Place your container (where you exposed setScroll) in the center and make sure to invoke setScrollableY(true) on that Container.
I have a basic plunker which shows the problem: http://plnkr.co/edit/L3rhEIdrnTucG0M7yGhO?p=preview. When you click on the button the first element is shown/hidden with a bouncy animation. This works fine, but the problem is that the items below it just jump to the new place which is quite ugly and jarring.
So, if you click on the button, item One slides away and then a second later items Two and Three jump up. I'd like everything to slide up while item One slides away. How can this be done? Do I need to drop animate.css and write my own custom animations? How would that work? (I don't really care about the bouncy animation, it should just slide away / back into view.)
The current bouncy animation that you have is using a transform property which isn't going to effect sibling elements. If you did something like animate the margin, other elements would move as well.
You could either change the animation method on your target element, or leave it and additionally animate the target's adjacent sibling. I modified your Plunker demonstrating the latter:
http://plnkr.co/edit/hMaPgRDYC8Z0EeCs6SHQ?p=preview
*This also demonstrations using transitions on the hide and keyframes on the show.
To select the adjacent sibling next to the one being effected by ng-hide, make a css selector with the + symbol:
.item.ng-hide-add + .item {...}
Then by transitioning/animating margin-top, the remaining item elements will get pushed around too.