From 9c31391d2f855e2904b50404923d3d54a7947b96 Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Sat, 29 Nov 2014 01:18:37 +0100
Subject: [PATCH] Disabling zoom if image viewer is open

---
 wcfsetup/install/files/js/WCF.ImageViewer.js |  4 ++
 wcfsetup/install/files/js/WCF.js             | 44 ++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/wcfsetup/install/files/js/WCF.ImageViewer.js b/wcfsetup/install/files/js/WCF.ImageViewer.js
index 19a9b068e9..7b5150b4c4 100644
--- a/wcfsetup/install/files/js/WCF.ImageViewer.js
+++ b/wcfsetup/install/files/js/WCF.ImageViewer.js
@@ -317,6 +317,7 @@ $.widget('ui.wcfImageViewer', {
 			this._isOpen = true;
 			
 			WCF.System.DisableScrolling.disable();
+			WCF.System.DisableZoom.disable();
 			
 			// switch to fullscreen mode on smartphones
 			if ($.browser.touch) {
@@ -341,6 +342,7 @@ $.widget('ui.wcfImageViewer', {
 				this._isOpen = true;
 			
 				WCF.System.DisableScrolling.disable();
+				WCF.System.DisableZoom.disable();
 			}
 		}
 		
@@ -371,6 +373,7 @@ $.widget('ui.wcfImageViewer', {
 		this._isOpen = false;
 		
 		WCF.System.DisableScrolling.enable();
+		WCF.System.DisableZoom.enable();
 		
 		return true;
 	},
@@ -1198,6 +1201,7 @@ $.widget('ui.wcfImageViewer', {
 			this._isOpen = true;
 		
 			WCF.System.DisableScrolling.disable();
+			WCF.System.DisableZoom.disable();
 		}
 	}
 });
diff --git a/wcfsetup/install/files/js/WCF.js b/wcfsetup/install/files/js/WCF.js
index ed8e801ece..b1f60721c5 100755
--- a/wcfsetup/install/files/js/WCF.js
+++ b/wcfsetup/install/files/js/WCF.js
@@ -7420,6 +7420,50 @@ WCF.System.DisableScrolling = {
 	}
 };
 
+/**
+ * Disables the ability to zoom the page.
+ */
+WCF.System.DisableZoom = {
+	/**
+	 * number of times zoom was disabled (nested calls)
+	 * @var	integer
+	 */
+	_depth: 0,
+	
+	/**
+	 * old viewport settings in meta[name=viewport]
+	 * @var	string
+	 */
+	_oldViewportSettings: null,
+	
+	/**
+	 * Disables zooming.
+	 */
+	disable: function () {
+		if (this._depth === 0) {
+			var $meta = $('meta[name=viewport]');
+			this._oldViewportSettings = $meta.attr('content');
+			$meta.attr('content', this._oldViewportSettings + ',maximum-scale=1');
+		}
+		
+		this._depth++;
+	},
+	
+	/**
+	 * Enables scrolling again.
+	 * Must be called the same number of times disable() was called to enable scrolling.
+	 */
+	enable: function () {
+		if (this._depth === 0) return;
+		
+		this._depth--;
+		
+		if (this._depth === 0) {
+			$('meta[name=viewport]').attr('content', this._oldViewportSettings);
+		}
+	}
+};
+
 /**
  * Puts an element into HTML 5 fullscreen mode.
  */
-- 
2.20.1