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// -----------------------------------------------------------------------------
// File: carousel.ss
// Description: carousel UI component (Debug Mode)
// Author: Alexandre Martins <http://opensurge2d.org>
// License: MIT
// -----------------------------------------------------------------------------
/*
This UI component lets you pick items in a Carousel.
*/
using SurgeEngine.Video.Screen;
using SurgeEngine.Transform;
using SurgeEngine.Vector2;
using SurgeEngine;
object "Debug Mode - Carousel" is "debug-mode-ui-component", "iterable", "detached", "private", "entity"
{
public readonly transform = Transform();
itemContainers = [];
itemHeight = 32;
itemWidth = 32;
uiScroller = spawn("Debug Mode - UI Scroller");
zindex = 0;
state "main"
{
// update the position and the size of the scroller
uiScroller.setActiveArea(0, transform.position.y, Screen.width, itemHeight);
// scroll the items
if(Math.abs(uiScroller.dx) > 0.1) {
transform.translateBy(uiScroller.dx, 0);
// keep the scroll within the boundaries of the carousel
width = itemWidth * itemContainers.length - Screen.width;
if(transform.localPosition.x > 0 || width <= 0)
transform.translateBy(-transform.localPosition.x, 0);
else if(width > 0 && transform.localPosition.x < -width)
transform.translateBy(-transform.localPosition.x - width, 0);
}
}
fun add(itemBuilder)
{
itemContainer = spawn("Debug Mode - Carousel Item Container");
item = itemBuilder.build(itemContainer);
itemContainer.init(item, itemContainers.length, itemWidth, itemHeight, zindex, this);
itemContainers.push(itemContainer);
return this;
}
fun clear()
{
foreach(container in itemContainers)
container.destroy();
itemContainers.clear();
return this;
}
fun get_width()
{
return itemWidth * itemContainers.length;
}
fun get_height()
{
return itemHeight;
}
fun iterator()
{
return spawn("Debug Mode - Carousel Iterator").setItemContainers(itemContainers);
}
fun setItemSize(width, height)
{
itemWidth = width;
itemHeight = height;
return this;
}
fun onLoad(debugMode)
{
tapDetector = debugMode.plugin("Debug Mode - Tap Detector");
tapDetector.subscribe(this);
uiSettings = debugMode.plugin("Debug Mode - UI Settings");
zindex = uiSettings.zindex + 500;
}
fun onUnload(debugMode)
{
tapDetector = debugMode.plugin("Debug Mode - Tap Detector");
tapDetector.unsubscribe(this);
}
fun onTapScreen(position)
{
// pick an item
if(uiScroller.isInActiveArea(position)) {
itemIndex = Math.floor((position.x - transform.localPosition.x) / itemWidth);
if(itemIndex >= 0 && itemIndex < itemContainers.length) {
// get the picked item
pickedCarouselItem = itemContainers[itemIndex].item;
// dehighlight all items
foreach(item in this)
item.highlighted = false;
// highlight the picked item
pickedCarouselItem.highlighted = true;
// callback
parent.onPickCarouselItem(pickedCarouselItem);
}
}
}
}
object "Debug Mode - Carousel Item" is "debug-mode-carousel-item", "detached", "private", "entity"
{
public carousel = null;
public zindex = 0;
public highlighted = false;
public readonly naturalWidth = 1;
public readonly naturalHeight = 1;
}
object "Debug Mode - Carousel Item Builder" is "debug-mode-carousel-item-builder"
{
fun build(itemContainer)
{
return null;
//return itemContainer.spawn("...");
}
}
object "Debug Mode - Carousel Item Container" is "detached", "private", "entity"
{
transform = Transform();
item = null; // another carousel item
fun get_item()
{
return item;
}
fun init(itemReference, itemIndex, itemWidth, itemHeight, itemZindex, carousel)
{
item = itemReference;
item.highlighted = false;
item.zindex = itemZindex;
item.carousel = carousel;
sx = itemWidth / item.naturalWidth;
sy = itemHeight / item.naturalHeight;
scale = Math.min(sx, sy);
transform.localScale = Vector2(scale, scale);
transform.localPosition = Vector2(itemWidth * itemIndex, 0);
return this;
}
}
object "Debug Mode - Carousel Iterator" is "iterator"
{
itemContainers = null;
index = 0;
fun setItemContainers(array)
{
itemContainers = array;
return this;
}
fun hasNext()
{
return index < itemContainers.length;
}
fun next()
{
if(!hasNext())
return null;
return itemContainers[index++].item;
}
}
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