From da4c7aa204db9d5ea7d83bfb010dc30e1001fa1f Mon Sep 17 00:00:00 2001
From: warenix <warenix@gmail.com>
Date: Mon, 17 Dec 2018 15:40:51 +0800
Subject: [PATCH] Add zoomFactor option to control max zoom

numeric, 1.0 means actual size, 2.0 means double the width and height

There's no zoom allowed if actual image size fits into the visible area.
Sometimes we need to zoom in to see details such as seeing floor plan
image.

Added $.fancybox.defaults.zoomFactor option to adjust maximum allowed zoom.
---
 src/js/core.js | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/js/core.js b/src/js/core.js
index 637a545e..96bea136 100644
--- a/src/js/core.js
+++ b/src/js/core.js
@@ -148,6 +148,9 @@
     // If opacity is "auto", then opacity will be changed if image and thumbnail have different aspect ratios
     zoomOpacity: "auto",
 
+    // maximum zoom factor
+    zoomFactor: 1.0,
+
     // Transition effect between slides
     //
     // Possible values:
@@ -1242,12 +1245,13 @@
 
     scaleToActual: function(x, y, duration) {
       var self = this,
+        opts = self.current ? self.current.opts : self.opts,
         current = self.current,
         $content = current.$content,
         canvasWidth = $.fancybox.getTranslate(current.$slide).width,
         canvasHeight = $.fancybox.getTranslate(current.$slide).height,
-        newImgWidth = current.width,
-        newImgHeight = current.height,
+        newImgWidth = current.width * opts.zoomFactor,
+        newImgHeight = current.height * opts.zoomFactor,
         imgPos,
         posX,
         posY,
@@ -1594,6 +1598,7 @@
 
     isZoomable: function() {
       var self = this,
+        opts = self.current ? self.current.opts : self.opts,
         current = self.current,
         fitPos;
 
@@ -1607,7 +1612,7 @@
 
         fitPos = self.getFitPos(current);
 
-        if (fitPos && (current.width > fitPos.width || current.height > fitPos.height)) {
+        if (fitPos && (current.width * opts.zoomFactor > fitPos.width || current.height * opts.zoomFactor > fitPos.height)) {
           return true;
         }
       }
@@ -1620,15 +1625,16 @@
 
     isScaledDown: function(nextWidth, nextHeight) {
       var self = this,
+        opts = self.current ? self.current.opts : self.opts,
         rez = false,
         current = self.current,
         $content = current.$content;
 
       if (nextWidth !== undefined && nextHeight !== undefined) {
-        rez = nextWidth < current.width && nextHeight < current.height;
+        rez = nextWidth < current.width * opts.zoomFactor && nextHeight < current.height * opts.zoomFactor;
       } else if ($content) {
         rez = $.fancybox.getTranslate($content);
-        rez = rez.width < current.width && rez.height < current.height;
+        rez = rez.width < current.width * opts.zoomFactor && rez.height < current.height * opts.zoomFactor;
       }
 
       return rez;