Infinite scrollable list.

InfiniteScrollableView.js

/**
 * We're going to create an infinite scrollable list. In this case, we're going to show a date. When you swipe left,
 * you'll see yesterday. Then the day before yesterday, and so on. Swiping right shows you tomorrow, and so on.
 */
var win = Ti.UI.createWindow({ backgroundColor: '#fff' });
var isAndroid = Ti.Platform.osname === 'android';
/**
 * Track where we are in the infinite scrollable views, and define how large of a step goes between each view.
 */
var currentDate = new Date(), msIntervalBetweenViews = 1000/*ms*/ * 60/*s*/ * 60/*m*/ * 24/*h*/;

/**
 * Create our UI elements.
 */
var scrollable = Ti.UI.createScrollableView({ currentPage: 1, showPagingControls: true, pagingControlHeight: 30 }),
        containers = [
            Ti.UI.createView({ backgroundColor:'#fdd', top: 0, right: 0, bottom: 0, left: 0 }),
            Ti.UI.createView({ backgroundColor:'#dfd', top: 0, right: 0, bottom: 0, left: 0 }),
            Ti.UI.createView({ backgroundColor:'#ddf', top: 0, right: 0, bottom: 0, left: 0 })
        ];
win.add(scrollable);
scrollable.views = containers;

/**
 * Loads data into the specified view based on the specified date.
 * @param view
 * @param date
 */
function loadView(view, date) {
    // empty out any children
    if (view.children) {
        for (var c = view.children.length - 1; c >= 0; c--) {
            view.remove(view.children[c]);
        }
    }
    // add new children
    var label = Ti.UI.createLabel({
        text: date.toLocaleDateString(),
        color: '#000',
        width:'auto',
        height:'auto'
    });
    view.add(label);
}

/**
 * Whenever we scroll, manipulate our views so that the user is back to viewing the "middle" view with a buffer view on
 * either side, then make sure the buffer views are actually loaded and ready to go.
 */
function scrollListener(evt) {
    // what is our current page?
    switch (evt.currentPage) {
        case 0: // scrolled to the left
            // so pop a view off the end, and put it at the start
            containers.unshift(containers.pop());
            if (isAndroid) {
                // temporarily remove our event listener (for Android's sake...)
                scrollable.removeEventListener('scroll', scrollListener);
            }
            // reset the counter so we are back in the middle
            scrollable.currentPage = 1;
            // reset our views array
            scrollable.views = containers;
            if (isAndroid) {
                // now we can add the event listener again
                scrollable.addEventListener('scroll', scrollListener);
            }
            // take a day from our currentDate
            currentDate.setDate(currentDate.getDate() - 1);
            // and now buffer load the view we reset
            loadView(containers[0], new Date(currentDate.getTime() - msIntervalBetweenViews));
            break;
        case 1:
            // they didn't go anywhere; should only happen the first time around
            break;
        case 2: // scrolled to the right
            // so shift a view off the start, and put it at the end
            containers.push(containers.shift());
            if (isAndroid) {
                // temporarily remove our event listener (for Android's sake...)
                scrollable.removeEventListener('scroll', scrollListener);
            }
            // reset the counter so we are back in the middle
            scrollable.currentPage = 1;
            // reset our views array
            scrollable.views = containers;
            if (isAndroid) {
                // now we can add the event listener again
                scrollable.addEventListener('scroll', scrollListener);
            }
            // add a day to our currentDate
            currentDate.setDate(currentDate.getDate() + 1);
            // and now buffer load the view we reset
            loadView(containers[2], new Date(currentDate.getTime() + msIntervalBetweenViews));
            break;
    }
}
scrollable.addEventListener('scroll', scrollListener);

/**
 * Set up our initial views.
 */
loadView(containers[0], new Date(currentDate.getTime() - msIntervalBetweenViews));
loadView(containers[1], currentDate);
loadView(containers[2], new Date(currentDate.getTime() + msIntervalBetweenViews));

/**
 * That's it, we just need to open the window! Hope you enjoyed this.
 */
win.open();

superb. There is though one issue. my views are fairly complicated with lots of child views. I have also changed the eventlistener from scroll to scrollend -> seems to make more sense.

now the issue is the following:

• slide right -> view n-1 shows up
• scrollable.currentPage = 1; -> this causes a very quick flickr

Reason: inserting a new view after scrolling -> since current page is then 0 it will go to the newly inserted page and setting it back to currentPage=1 causes that small flickr.

Any ideas, inputs on this?

did you find a solution for the flicker problem? @rapsli

I also have the same problem! Did you have any solution?

hell yeah, looks like general problem with scrollable view on droid, flickers after adding views, seems to be ok on ios