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Zoom Image on mouse scroll #539

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Zoom Image on mouse scroll #539

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74 changes: 73 additions & 1 deletion src/js/lightbox.js
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Original file line number Diff line number Diff line change
Expand Up @@ -135,8 +135,80 @@
self.end();
return false;
});
//bind event to mouse scroll
this.img = this.$container.find('.lb-image');
this.label = this.$lightbox.find('.lb-dataContainer');
$([this.$overlay[0], this.$lightbox[0]]).bind("mousewheel",
function(e) {
var flag = e.originalEvent.wheelDelta < 0;
var imgH = self.img.height();
var imgW = self.img.width();
var imgY = self.img.offset().top;
var imgX = self.img.offset().left;
var nw = Math.round(20 * imgW / imgH);
var ctH = self.$outerContainer.height();
var ctW = self.$outerContainer.width();
var layH = self.$overlay.height() - 20;
var layW = self.$overlay.width() - nw - 20;
var layY = self.$overlay.offset().top;
var layX = self.$overlay.offset().left;
if (flag && imgH > 20 && imgW > 20) {// scroll down
self.img.css('height', imgH - 20);
self.img.css('width', imgW - nw);
self.$outerContainer.css('height', ctH - 20);
self.$outerContainer.css('width', ctW - nw);
if (ctW - nw > 240) {
self.label.css('width', ctW - nw);
}
} else if (!flag && (imgH) < layH && (imgW) < layW) {//scroll up
if (imgY + imgH + 20 > layY + layH) {
self.$overlay.height(self.$overlay.height() + 20);
}
self.img.css('height', imgH + 20);
self.img.css('width', imgW + nw);
self.$outerContainer.css('height', ctH + 20);
self.$outerContainer.css('width', ctW + nw);
self.label.css('width', ctW + nw);
}
e.stopPropagation();
return false;
});
$([this.$overlay[0], this.$lightbox[0]]).bind("DOMMouseScroll",
function(e) {
var flag = e.originalEvent.detail > 0;
var imgH = self.img.height();
var imgW = self.img.width();
var imgY = self.img.offset().top;
var imgX = self.img.offset().left;
var nw = Math.round(20 * imgW / imgH);
var ctH = self.$outerContainer.height();
var ctW = self.$outerContainer.width();
var layH = self.$overlay.height() - 20;
var layW = self.$overlay.width() - nw - 20;
var layY = self.$overlay.offset().top;
var layX = self.$overlay.offset().left;
if (flag && imgH > 20 && imgW > 20) {// scroll down
self.img.css('height', imgH - 20);
self.img.css('width', imgW - nw);
self.$outerContainer.css('height', ctH - 20);
self.$outerContainer.css('width', ctW - nw);
if (ctW - nw > 240) {
self.label.css('width', ctW - nw);
}
} else if (!flag && (imgH) < layH && (imgW) < layW) {//scroll up
if (imgY + imgH + 20 > layY + layH) {
self.$overlay.height(self.$overlay.height() + 20);
}
self.img.css('height', imgH + 20);
self.img.css('width', imgW + nw);
self.$outerContainer.css('height', ctH + 20);
self.$outerContainer.css('width', ctW + nw);
self.label.css('width', ctW + nw);
}
e.stopPropagation();
return false;
});
};

// Show overlay and lightbox. If the image is part of a set, add siblings to album array.
Lightbox.prototype.start = function($link) {
var self = this;
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