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 = GUI.window.new("EZScroller test", Rect(100, 400,200, 100)).front;

// 5 displays

v = { |i| GUI.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;