From aa5d871b5a643c1157afaa4dbe58e06ec71834ab Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Fri, 21 Aug 2020 21:31:37 +0200
Subject: [PATCH] Experimental single finger pan

---
 .../java/eu/faircode/email/AdapterMessage.java |  5 +++--
 .../main/java/eu/faircode/email/WebViewEx.java | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/eu/faircode/email/AdapterMessage.java b/app/src/main/java/eu/faircode/email/AdapterMessage.java
index 65c1efb53c..17dd3390dc 100644
--- a/app/src/main/java/eu/faircode/email/AdapterMessage.java
+++ b/app/src/main/java/eu/faircode/email/AdapterMessage.java
@@ -2764,8 +2764,9 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                 } else
                     return false;
             } else {
-                view.getParent().requestDisallowInterceptTouchEvent(false);
-                return (view.getId() == R.id.wvBody && ev.getAction() == MotionEvent.ACTION_MOVE);
+                boolean intercept = (view.getId() == R.id.wvBody && ((WebViewEx) wvBody).isZoomed());
+                view.getParent().requestDisallowInterceptTouchEvent(intercept);
+                return false;
             }
         }
 
diff --git a/app/src/main/java/eu/faircode/email/WebViewEx.java b/app/src/main/java/eu/faircode/email/WebViewEx.java
index 0d1d71030c..9be748a836 100644
--- a/app/src/main/java/eu/faircode/email/WebViewEx.java
+++ b/app/src/main/java/eu/faircode/email/WebViewEx.java
@@ -183,6 +183,24 @@ public class WebViewEx extends WebView implements DownloadListener, View.OnLongC
         return super.onGenericMotionEvent(event);
     }
 
+    public boolean isZoomed() {
+        int xtend = computeHorizontalScrollExtent();
+        if (xtend != 0) {
+            float xscale = computeHorizontalScrollRange() / (float) xtend;
+            if (xscale > 1.2)
+                return true;
+        }
+
+        int ytend = computeVerticalScrollExtent();
+        if (ytend != 0) {
+            float yscale = computeVerticalScrollRange() / (float) ytend;
+            if (yscale > 1.2)
+                return true;
+        }
+
+        return false;
+    }
+
     interface IWebView {
         void onSizeChanged(int w, int h, int ow, int oh);