Pinch zoom text size

FAQ.md

@@ -54,12 +54,12 @@ For authorizing:
 * ~~Pinch zoom~~ (not reliably possible in a scrolling list; the full message view can be zoomed instead)
 * ~~More compact folder view~~
 * ~~Compose lists and tables~~ (this requires a rich text editor, see [this FAQ](#user-content-faq99))
+* ~~Pinch zoom text size~~
 * Send as attachment
 * Themes
 * Search for settings
 * Select any day for time conditions
 * Widget for selected account
-* Pinch zoom
 
 Anything on this list is in random order and *might* be added in the near future.
 

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -66,6 +66,7 @@ import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.MotionEvent;
+import android.view.ScaleGestureDetector;
 import android.view.TouchDelegate;
 import android.view.View;
 import android.view.ViewAnimationUtils;
@@ -227,7 +228,11 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     ));
 
     public class ViewHolder extends RecyclerView.ViewHolder implements
-            View.OnClickListener, View.OnLongClickListener, BottomNavigationView.OnNavigationItemSelectedListener, View.OnKeyListener {
+            View.OnKeyListener,
+            View.OnClickListener,
+            View.OnLongClickListener,
+            View.OnTouchListener,
+            BottomNavigationView.OnNavigationItemSelectedListener {
         private View card;
         private View view;
 
@@ -331,6 +336,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         private boolean hasJunk;
         private boolean delete;
 
+        private ScaleGestureDetector gestureDetector;
+
         ViewHolder(final View itemView) {
             super(itemView);
 
@@ -508,9 +515,25 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                 ibImages.setOnClickListener(this);
                 ibDecrypt.setOnClickListener(this);
 
+                tvBody.setOnTouchListener(this);
+
                 btnCalendarAccept.setOnClickListener(this);
                 btnCalendarDecline.setOnClickListener(this);
                 btnCalendarMaybe.setOnClickListener(this);
+
+                gestureDetector = new ScaleGestureDetector(context, new ScaleGestureDetector.SimpleOnScaleGestureListener() {
+                    @Override
+                    public boolean onScale(ScaleGestureDetector detector) {
+                        TupleMessageEx message = getMessage();
+                        if (message != null) {
+                            float factor = detector.getScaleFactor();
+                            float size = tvBody.getTextSize() * factor;
+                            properties.setSize(message.id, size);
+                            tvBody.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
+                        }
+                        return true;
+                    }
+                });
             }
         }
 
@@ -540,6 +563,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                 ibImages.setOnClickListener(null);
                 ibDecrypt.setOnClickListener(null);
 
+                tvBody.setOnTouchListener(null);
+
                 btnCalendarAccept.setOnClickListener(null);
                 btnCalendarDecline.setOnClickListener(null);
                 btnCalendarMaybe.setOnClickListener(null);
@@ -950,8 +975,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             ibFull.setVisibility(View.GONE);
             ibImages.setVisibility(View.GONE);
 
-            if (textSize != 0)
+            if (textSize != 0) {
-                tvBody.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
+                float size = properties.getSize(message.id, textSize);
+                tvBody.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
+            }
 
             tvBody.setTextColor(contrast ? textColorPrimary : textColorSecondary);
             tvBody.setTypeface(monospaced ? Typeface.MONOSPACE : Typeface.DEFAULT);
@@ -1417,6 +1444,27 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
         private boolean firstClick = false;
 
+        @Override
+        public boolean onTouch(View view, MotionEvent ev) {
+            if (ev.getPointerCount() > 1 &&
+                    textSize != 0 && gestureDetector != null) {
+                switch (ev.getAction()) {
+                    case MotionEvent.ACTION_DOWN:
+                    case MotionEvent.ACTION_MOVE:
+                        view.getParent().requestDisallowInterceptTouchEvent(true);
+                        gestureDetector.onTouchEvent(ev);
+                        break;
+
+                    case MotionEvent.ACTION_UP:
+                        view.getParent().requestDisallowInterceptTouchEvent(false);
+                        gestureDetector.onTouchEvent(ev);
+                        break;
+                }
+                return true;
+            }
+            return false;
+        }
+
         @Override
         public void onClick(View view) {
             final TupleMessageEx message = getMessage();
@@ -3477,6 +3525,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
         boolean getValue(String name, long id);
 
+        void setSize(long id, float size);
+
+        float getSize(long id, float defaultSize);
+
         void setBody(long id, Spanned body);
 
         Spanned getBody(long id);

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -232,6 +232,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
     private int autoCloseCount = 0;
     private boolean autoExpanded = true;
     private Map<String, List<Long>> values = new HashMap<>();
+    private LongSparseArray<Float> sizes = new LongSparseArray<>();
     private LongSparseArray<Spanned> bodies = new LongSparseArray<>();
     private LongSparseArray<List<EntityAttachment>> attachments = new LongSparseArray<>();
     private LongSparseArray<TupleAccountSwipes> accountSwipes = new LongSparseArray<>();
@@ -1179,6 +1180,16 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             return false;
         }
 
+        @Override
+        public void setSize(long id, float size) {
+            sizes.put(id, size);
+        }
+
+        @Override
+        public float getSize(long id, float defaultSize) {
+            return sizes.get(id, defaultSize);
+        }
+
         @Override
         public void setBody(long id, Spanned value) {
             if (value == null)