ScalableImageView #titanium

ScalableImageView.js

var ScalableImageView = function(params) {
  var self = Ti.UI.createImageView(params);
	if (params.scaleType != 'aspectFit') {
		self.addEventListener('load', function(e) {
			var image = self.toBlob();
			var selfBlob = self.toImage();

			if (params.scaleType == 'aspectFill') {
				var imageWidth = image.width;
				var imageHeight = image.height;
				var crop = maxCenter(selfBlob, {
					x : 0,
					y : 0,
					width : imageWidth,
					height : imageHeight,
				});
				self.image = image.imageAsCropped(crop);
			} else if (params.scaleType == 'fill') {
				var w, h;
				w = selfBlob.width;
				h = selfBlob.height;
				self.image = image.imageAsResized(w, h);
			}
		});
	}

	var maxCenter = function(s, ir) {
		var result = {};
		if (ir.height / ir.width > s.height / s.width) {
			result.width = ir.width;
			result.height = s.height * ir.width / s.width;
			result.x = ir.x;
			result.y = ir.y + (ir.height - result.height) / 2;
		} else {
			result.height = ir.height;
			result.width = s.width * ir.height / s.height;
			result.y = ir.y;
			result.x = ir.x + (ir.width - result.width) / 2;
		}
		return result;
	}

	return self;
};