Hide toolbar improvements

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

@@ -847,8 +847,11 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
             else
                 ab.hide();
         } else {
+            int height = Helper.getActionBarHeight(this);
+            int current = abv.getLayoutParams().height;
+            int target = (show ? height : 0);
             if (abAnimator == null) {
-                abAnimator = ValueAnimator.ofInt(0, Helper.getActionBarHeight(this));
+                abAnimator = ValueAnimator.ofInt(current, target);
                 abAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                     @Override
                     public void onAnimationUpdate(ValueAnimator anim) {
@@ -860,18 +863,13 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
                         }
                     }
                 });
-                abAnimator.setDuration(250L);
-            } else
+            } else {
                 abAnimator.cancel();
+                abAnimator.setIntValues(current, target);
+            }
 
-            int target = (show ? Helper.getActionBarHeight(this) : 0);
-            if (abv.getLayoutParams().height == target)
-                return;
-
-            if (show)
-                abAnimator.start();
-            else
-                abAnimator.reverse();
+            abAnimator.setDuration(250L * Math.abs(current - target) / height);
+            abAnimator.start();
         }
     }
 

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

@@ -124,6 +124,7 @@ public class FragmentFolders extends FragmentBase {
     private boolean primary;
     private boolean show_hidden = false;
     private boolean show_flagged = false;
+    private boolean hide_toolbar = false;
     private String searching = null;
     private AdapterFolder adapter;
 
@@ -155,6 +156,7 @@ public class FragmentFolders extends FragmentBase {
         compact = prefs.getBoolean("compact_folders", true);
         show_hidden = false; // prefs.getBoolean("hidden_folders", false);
         show_flagged = prefs.getBoolean("flagged_folders", false);
+        hide_toolbar = prefs.getBoolean("hide_toolbar", true);
 
         if (BuildConfig.DEBUG) {
             ViewModelSelected selectedModel =
@@ -308,6 +310,26 @@ public class FragmentFolders extends FragmentBase {
             rvFolder.addItemDecoration(categoryDecorator);
         }
 
+        rvFolder.addOnScrollListener(new RecyclerView.OnScrollListener() {
+            private boolean show = true;
+
+            @Override
+            public void onScrolled(@NonNull RecyclerView rv, int dx, int dy) {
+                if (hide_toolbar && dy != 0) {
+                    int range = rv.computeVerticalScrollRange();
+                    int extend = rv.computeVerticalScrollExtent();
+                    boolean canScrollVertical = (range > extend);
+                    show = (!canScrollVertical || (rv.computeVerticalScrollOffset() == 0 || dy < 0));
+                }
+            }
+
+            @Override
+            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
+                if (hide_toolbar && newState != RecyclerView.SCROLL_STATE_DRAGGING)
+                    showActionBar(show);
+            }
+        });
+
         adapter = new AdapterFolder(this, account, unified, primary, compact, show_hidden, show_flagged, null);
         rvFolder.setAdapter(adapter);
 

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

@@ -27,7 +27,6 @@ import static android.text.format.DateUtils.FORMAT_SHOW_WEEKDAY;
 import static android.view.KeyEvent.ACTION_DOWN;
 import static android.view.KeyEvent.ACTION_UP;
 import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
-import static androidx.recyclerview.widget.RecyclerView.SCROLL_STATE_IDLE;
 import static org.openintents.openpgp.OpenPgpSignatureResult.RESULT_KEY_MISSING;
 import static org.openintents.openpgp.OpenPgpSignatureResult.RESULT_NO_SIGNATURE;
 import static org.openintents.openpgp.OpenPgpSignatureResult.RESULT_VALID_KEY_CONFIRMED;
@@ -1123,17 +1122,18 @@ public class FragmentMessages extends FragmentBase
                     }
                 }
 
-                if (hide_toolbar) {
+                if (hide_toolbar && dy != 0) {
                     int range = rv.computeVerticalScrollRange();
                     int extend = rv.computeVerticalScrollExtent();
+                    int offset = rv.computeVerticalScrollOffset();
                     boolean canScrollVertical = (range > extend);
-                    show = (!canScrollVertical || (rv.computeVerticalScrollOffset() == 0 || dy < 0));
+                    show = (!canScrollVertical || (offset == 0 || dy < 0));
                 }
             }
 
             @Override
             public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
-                if (hide_toolbar && newState == SCROLL_STATE_IDLE)
+                if (hide_toolbar && newState != RecyclerView.SCROLL_STATE_DRAGGING)
                     showActionBar(show);
             }
         });