EZScroller show a subset of items on gui elements

EZScroller is a vertical slider that allows displaying different subsets of a

dynamically changing list of objects on a fixed number of views by scrolling.

EZScroller is used JITLib guis like NodeProxyEditor, ProxyMixer,

TdefAllGui, and PdefAllGui.

(

w = Window.new("EZScroller test", Rect(100, 400,200, 100)).front;

// 5 displays

v = { |i| DragBoth.new(w, Rect(0, i * 20, 100, 20)) }.dup(5);

// 12 items

a = (1..12);

e = EZScroller(w, Rect(100,0,14,100), v.size, a.size, { |sc|

var startIndex = sc.value.asInteger.postcs;

v.do { |drag, i| drag.object_( a[ (startIndex) + i] ? ""); };

e.visible_(sc.numItems > sc.maxItems); // hide when not useful

});

e.doAction;

)

// change list a, update ezscroller

a = (1..4); e.numItems_(a.size); e.doAction;

a = (1..8); e.numItems_(a.size); e.doAction;