improve swipe gesture

src/main/java/eu/siacs/conversations/ui/ConversationFragment.java

@@ -1482,11 +1482,27 @@ public class ConversationFragment extends XmppFragment
         };
         messageListAdapter.setMessageEmptyPartLongClickListener(messageClickListener);
         messageListAdapter.setSelectionStatusProvider(provider);
-        messageListAdapter.setOnMessageBoxSwiped(message -> {
+        messageListAdapter.setOnMessageBoxSwiped(
+                new MessageAdapter.MessageBoxSwipedListener() {
+                    @Override
+                    public void onMessageBoxReleasedAfterSwipe(Message message) {
                         if (selectionActionMode == null) {
                             quoteMessage(message);
                         }
-        });
+                    }
+
+                    @Override
+                    public void onMessageBoxSwipedEnough() {
+                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                            vibrator.vibrate(VibrationEffect.createPredefined(VibrationEffect.EFFECT_TICK));
+                        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                            vibrator.vibrate(VibrationEffect.createOneShot(10L, 127));
+                        } else {
+                            vibrator.vibrate(10L);
+                        }
+                    }
+                }
+        );
         messageListAdapter.setReplyClickListener(this::scrollToReply);
 
         binding.messagesView.setAdapter(messageListAdapter);
@@ -1568,10 +1584,6 @@ public class ConversationFragment extends XmppFragment
 
 
         showKeyboard(binding.textinput);
-
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-            vibrator.vibrate(VibrationEffect.createPredefined(VibrationEffect.EFFECT_TICK));
-        }
     }
 
     private void scrollToReply(Message message) {

src/main/java/eu/siacs/conversations/ui/DraggableListView.kt

@@ -31,7 +31,7 @@ class DraggableListView : ListView {
         }
 
         dragHelper = if (dragHelperCallback != null) {
-            ViewDragHelper.create(this, dragHelperCallback)
+            ViewDragHelper.create(this, 0.8f, dragHelperCallback)
         } else {
             null
         }

src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java

@@ -45,7 +45,6 @@ import com.google.common.base.Strings;
 
 import java.lang.ref.WeakReference;
 import java.net.URI;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
 import java.util.regex.Matcher;
@@ -117,11 +116,21 @@ public class MessageAdapter extends ArrayAdapter<Message> implements DraggableLi
 
     private ViewDragHelper dragHelper = null;
     private final ViewDragHelper.Callback dragCallback = new ViewDragHelper.Callback() {
+        private int horizontalOffset = 0;
+        private boolean swipedEnoughFirstTime = true;
+
         @Override
         public boolean tryCaptureView(@NonNull View child, int pointerId) {
             return child.getTag(R.id.TAG_DRAGGABLE) != null;
         }
 
+        @Override
+        public void onViewCaptured(@NonNull View capturedChild, int activePointerId) {
+            horizontalOffset = 0;
+            swipedEnoughFirstTime = true;
+            super.onViewCaptured(capturedChild, activePointerId);
+        }
+
         @Override
         public void onViewReleased(@NonNull View releasedChild, float xvel, float yvel) {
             if (dragHelper != null) {
@@ -129,19 +138,29 @@ public class MessageAdapter extends ArrayAdapter<Message> implements DraggableLi
                 ViewCompat.postOnAnimation(releasedChild, new SettleRunnable(releasedChild));
                 ViewHolder viewHolder = (ViewHolder) releasedChild.getTag();
 
-                if (viewHolder != null && viewHolder.position >= 0 && viewHolder.position < getCount()) {
+                if (viewHolder != null && viewHolder.position >= 0 && viewHolder.position < getCount() && horizontalOffset < -releasedChild.getWidth()/6) {
                     Message m = getItem(viewHolder.position);
                     if (messageBoxSwipedListener != null) {
-                        messageBoxSwipedListener.onMessageBoxSwiped(m);
+                        messageBoxSwipedListener.onMessageBoxReleasedAfterSwipe(m);
                     }
                 }
             }
+            horizontalOffset = 0;
+            swipedEnoughFirstTime = true;
             super.onViewReleased(releasedChild, xvel, yvel);
         }
 
         @Override
         public int clampViewPositionHorizontal(@NonNull View child, int left, int dx) {
-            return Math.max(-child.getWidth()/4, Math.min(left, 0));
+            int fixedLeft = Math.min(left, 0);
+            horizontalOffset = fixedLeft;
+
+            if (horizontalOffset < -child.getWidth()/6 && swipedEnoughFirstTime) {
+                swipedEnoughFirstTime = false;
+                messageBoxSwipedListener.onMessageBoxSwipedEnough();
+            }
+
+            return Math.max(-child.getWidth()/4, fixedLeft);
         }
 
 
@@ -1234,7 +1253,8 @@ public class MessageAdapter extends ArrayAdapter<Message> implements DraggableLi
     }
 
     public interface MessageBoxSwipedListener {
-        void onMessageBoxSwiped(Message message);
+        void onMessageBoxReleasedAfterSwipe(Message message);
+        void onMessageBoxSwipedEnough();
     }
 
     public interface ReplyClickListener {