Three column layout - proof of concept

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

@@ -88,7 +88,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
     private View content_separator;
     private View content_pane;
 
-    private DrawerLayout drawerLayout;
+    private DrawerLayoutEx drawerLayout;
     private ActionBarDrawerToggle drawerToggle;
     private ScrollView drawerContainer;
     private RecyclerView rvAccount;
@@ -154,7 +154,8 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
         content_pane = findViewById(R.id.content_pane);
 
         drawerLayout = findViewById(R.id.drawer_layout);
-        drawerLayout.setScrimColor(Helper.resolveColor(this, R.attr.colorDrawerScrim));
+        drawerLayout.setup(getResources().getConfiguration());
+        // drawerLayout.setScrimColor(Helper.resolveColor(this, R.attr.colorDrawerScrim));
 
         drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.app_name, R.string.app_name) {
             public void onDrawerClosed(View view) {
@@ -541,6 +542,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
     @Override
     public void onConfigurationChanged(Configuration newConfig) {
         super.onConfigurationChanged(newConfig);
+        drawerLayout.setup(newConfig);
         drawerToggle.onConfigurationChanged(newConfig);
     }
 

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

@@ -0,0 +1,87 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2019 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.Context;
+import android.content.res.Configuration;
+import android.graphics.Color;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.drawerlayout.widget.DrawerLayout;
+
+public class DrawerLayoutEx extends DrawerLayout {
+    private boolean locked;
+
+    public DrawerLayoutEx(@NonNull Context context) {
+        super(context);
+    }
+
+    public DrawerLayoutEx(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public DrawerLayoutEx(@NonNull Context context, @Nullable AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    void setup(Configuration config) {
+        Log.i("Drawer setup orientation=" + config.orientation);
+        ViewGroup childContent = (ViewGroup) getChildAt(0);
+        ViewGroup childDrawer = (ViewGroup) getChildAt(1);
+        if (config.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            locked = true;
+            setDrawerLockMode(LOCK_MODE_LOCKED_OPEN);
+            setScrimColor(Color.TRANSPARENT);
+            childContent.setPaddingRelative(childDrawer.getLayoutParams().width, 0, 0, 0);
+        } else {
+            locked = false;
+            setDrawerLockMode(LOCK_MODE_UNLOCKED);
+            setScrimColor(Helper.resolveColor(getContext(), R.attr.colorDrawerScrim));
+            childContent.setPaddingRelative(0, 0, 0, 0);
+            closeDrawers();
+        }
+    }
+
+    @Override
+    public boolean isDrawerOpen(@NonNull View drawer) {
+        return (!locked && super.isDrawerOpen(drawer));
+    }
+
+    @Override
+    public boolean isDrawerOpen(int drawerGravity) {
+        return (!locked && super.isDrawerOpen(drawerGravity));
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(final MotionEvent ev) {
+        return (!locked && super.onInterceptTouchEvent(ev));
+    }
+
+    @Override
+    public void closeDrawer(@NonNull View drawerView) {
+        if (!locked)
+            super.closeDrawer(drawerView);
+    }
+}

app/src/main/res/layout/activity_view_landscape.xml

@@ -1,4 +1,4 @@
-<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<eu.faircode.email.DrawerLayoutEx xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/drawer_layout"
     android:layout_width="match_parent"
@@ -42,4 +42,4 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content" />
     </ScrollView>
-</androidx.drawerlayout.widget.DrawerLayout>
+</eu.faircode.email.DrawerLayoutEx>

app/src/main/res/layout/activity_view_portrait.xml

@@ -1,4 +1,4 @@
-<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<eu.faircode.email.DrawerLayoutEx xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/drawer_layout"
     android:layout_width="match_parent"
@@ -23,4 +23,4 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content" />
     </ScrollView>
-</androidx.drawerlayout.widget.DrawerLayout>
+</eu.faircode.email.DrawerLayoutEx>