Allow to change number of columns

app/src/main/java/eu/kanade/mangafeed/data/preference/PreferencesHelper.java

@@ -91,6 +91,14 @@ public class PreferencesHelper {
         return Integer.parseInt(prefs.getString(getKey(R.string.pref_default_viewer_key), "1"));
     }
 
+    public Preference<Integer> portraitColumns() {
+        return rxPrefs.getInteger(getKey(R.string.pref_library_columns_portrait_key), 0);
+    }
+
+    public Preference<Integer> landscapeColumns() {
+        return rxPrefs.getInteger(getKey(R.string.pref_library_columns_landscape_key), 0);
+    }
+
     public String getSourceUsername(Source source) {
         return prefs.getString(SOURCE_ACCOUNT_USERNAME + source.getId(), "");
     }

app/src/main/java/eu/kanade/mangafeed/injection/component/AppComponent.java

@@ -14,6 +14,7 @@ import eu.kanade.mangafeed.injection.module.AppModule;
 import eu.kanade.mangafeed.injection.module.DataModule;
 import eu.kanade.mangafeed.ui.catalogue.CataloguePresenter;
 import eu.kanade.mangafeed.ui.download.DownloadPresenter;
+import eu.kanade.mangafeed.ui.library.LibraryCategoryFragment;
 import eu.kanade.mangafeed.ui.library.LibraryPresenter;
 import eu.kanade.mangafeed.ui.manga.MangaActivity;
 import eu.kanade.mangafeed.ui.manga.MangaPresenter;
@@ -48,6 +49,8 @@ public interface AppComponent {
     void inject(SettingsAccountsFragment settingsAccountsFragment);
     void inject(SettingsActivity settingsActivity);
 
+    void inject(LibraryCategoryFragment libraryCategoryFragment);
+
     void inject(Source source);
 
     void inject(MyAnimeList myAnimeList);

app/src/main/java/eu/kanade/mangafeed/ui/library/LibraryCategoryFragment.java

@@ -1,41 +1,52 @@
 package eu.kanade.mangafeed.ui.library;
 
 import android.content.Intent;
+import android.content.res.Configuration;
 import android.os.Bundle;
 import android.support.v7.view.ActionMode;
-import android.support.v7.widget.GridLayoutManager;
-import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
+import com.f2prateek.rx.preferences.Preference;
+
 import java.util.List;
 
+import javax.inject.Inject;
+
 import butterknife.Bind;
 import butterknife.ButterKnife;
+import eu.kanade.mangafeed.App;
 import eu.kanade.mangafeed.R;
 import eu.kanade.mangafeed.data.database.models.Category;
 import eu.kanade.mangafeed.data.database.models.Manga;
+import eu.kanade.mangafeed.data.preference.PreferencesHelper;
 import eu.kanade.mangafeed.event.LibraryMangasEvent;
 import eu.kanade.mangafeed.ui.base.activity.BaseActivity;
 import eu.kanade.mangafeed.ui.base.adapter.FlexibleViewHolder;
 import eu.kanade.mangafeed.ui.base.fragment.BaseFragment;
 import eu.kanade.mangafeed.ui.manga.MangaActivity;
 import eu.kanade.mangafeed.util.EventBusHook;
+import eu.kanade.mangafeed.widget.AutofitRecyclerView;
 import icepick.Icepick;
 import icepick.State;
+import rx.Subscription;
 
 public class LibraryCategoryFragment extends BaseFragment implements
         ActionMode.Callback, FlexibleViewHolder.OnListItemClickListener {
 
-    @Bind(R.id.library_mangas) RecyclerView recycler;
+    @Inject PreferencesHelper preferences;
+
+    @Bind(R.id.library_mangas) AutofitRecyclerView recycler;
 
     @State Category category;
     private LibraryCategoryAdapter adapter;
     private ActionMode actionMode;
 
+    private Subscription numColumnsSubscription;
+
     private static final int INVALID_POSITION = -1;
 
     public static LibraryCategoryFragment newInstance(Category category) {
@@ -44,6 +55,12 @@ public class LibraryCategoryFragment extends BaseFragment implements
         return fragment;
     }
 
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        App.get(getActivity()).getComponent().inject(this);
+    }
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
         // Inflate the layout for this fragment
@@ -52,14 +69,27 @@ public class LibraryCategoryFragment extends BaseFragment implements
         Icepick.restoreInstanceState(this, savedState);
 
         recycler.setHasFixedSize(true);
-        recycler.setLayoutManager(new GridLayoutManager(getActivity(), 4));
 
         adapter = new LibraryCategoryAdapter(this);
         recycler.setAdapter(adapter);
 
+        Preference<Integer> columnsPref = getResources().getConfiguration()
+                .orientation == Configuration.ORIENTATION_PORTRAIT ?
+                preferences.portraitColumns() :
+                preferences.landscapeColumns();
+
+        numColumnsSubscription = columnsPref.asObservable()
+                .subscribe(recycler::setSpanCount);
+
         return view;
     }
 
+    @Override
+    public void onDestroyView() {
+        numColumnsSubscription.unsubscribe();
+        super.onDestroyView();
+    }
+
     @Override
     public void onResume() {
         super.onResume();

app/src/main/java/eu/kanade/mangafeed/ui/setting/SettingsActivity.java

@@ -48,6 +48,10 @@ public class SettingsActivity extends BaseActivity {
             super.onCreate(savedInstanceState);
             addPreferencesFromResource(R.xml.pref_main);
 
+            registerSubpreference(R.string.pref_category_general_key,
+                    SettingsGeneralFragment.newInstance(
+                            R.xml.pref_general, R.string.pref_category_general));
+
             registerSubpreference(R.string.pref_category_reader_key,
                     SettingsNestedFragment.newInstance(
                             R.xml.pref_reader, R.string.pref_category_reader));

app/src/main/java/eu/kanade/mangafeed/ui/setting/SettingsGeneralFragment.java

@@ -0,0 +1,36 @@
+package eu.kanade.mangafeed.ui.setting;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import eu.kanade.mangafeed.R;
+import eu.kanade.mangafeed.data.preference.PreferencesHelper;
+import eu.kanade.mangafeed.ui.setting.preference.LibraryColumnsDialog;
+
+public class SettingsGeneralFragment extends SettingsNestedFragment {
+
+    private LibraryColumnsDialog columnsDialog;
+
+    public static SettingsNestedFragment newInstance(int resourcePreference, int resourceTitle) {
+        SettingsNestedFragment fragment = new SettingsGeneralFragment();
+        fragment.setArgs(resourcePreference, resourceTitle);
+        return fragment;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
+        View view = super.onCreateView(inflater, container, savedState);
+
+        PreferencesHelper preferences = getSettingsActivity().preferences;
+
+        columnsDialog = (LibraryColumnsDialog) findPreference(
+                getString(R.string.pref_library_columns_dialog_key));
+
+        columnsDialog.setPreferencesHelper(preferences);
+
+        return view;
+    }
+
+}

app/src/main/java/eu/kanade/mangafeed/ui/setting/preference/LibraryColumnsDialog.java

@@ -0,0 +1,80 @@
+package eu.kanade.mangafeed.ui.setting.preference;
+
+import android.content.Context;
+import android.preference.DialogPreference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.NumberPicker;
+
+import butterknife.Bind;
+import butterknife.ButterKnife;
+import eu.kanade.mangafeed.R;
+import eu.kanade.mangafeed.data.preference.PreferencesHelper;
+
+public class LibraryColumnsDialog extends DialogPreference {
+
+    private Context context;
+    private PreferencesHelper preferences;
+
+    @Bind(R.id.portrait_columns) NumberPicker portraitColumns;
+    @Bind(R.id.landscape_columns) NumberPicker landscapeColumns;
+
+    public LibraryColumnsDialog(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    public LibraryColumnsDialog(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context);
+    }
+
+    private void init(Context context) {
+        this.context = context;
+        setDialogLayoutResource(R.layout.pref_library_columns);
+    }
+
+    @Override
+    protected void onBindDialogView(View view) {
+        super.onBindDialogView(view);
+        ButterKnife.bind(this, view);
+
+        portraitColumns.setValue(preferences.portraitColumns().get());
+        landscapeColumns.setValue(preferences.landscapeColumns().get());
+    }
+
+    @Override
+    protected void onDialogClosed(boolean positiveResult) {
+        super.onDialogClosed(positiveResult);
+
+        if (positiveResult) {
+            preferences.portraitColumns().set(portraitColumns.getValue());
+            preferences.landscapeColumns().set(landscapeColumns.getValue());
+            updateSummary();
+        }
+    }
+
+    private void updateSummary() {
+        setSummary(getColumnsSummary());
+    }
+
+    private String getColumnsSummary() {
+        return String.format("%s: %s, %s: %s",
+                context.getString(R.string.portrait),
+                getColumnValue(preferences.portraitColumns().get()),
+                context.getString(R.string.landscape),
+                getColumnValue(preferences.landscapeColumns().get()));
+    }
+
+    private String getColumnValue(int value) {
+        return value == 0 ? context.getString(R.string.default_columns) : value + "";
+    }
+
+    public void setPreferencesHelper(PreferencesHelper preferences) {
+        this.preferences = preferences;
+
+        // Set initial summary when the preferences helper is provided
+        updateSummary();
+    }
+
+}

app/src/main/java/eu/kanade/mangafeed/widget/AutofitRecyclerView.java

@@ -0,0 +1,60 @@
+package eu.kanade.mangafeed.widget;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.util.AttributeSet;
+
+public class AutofitRecyclerView extends RecyclerView {
+
+    private GridLayoutManager manager;
+    private int columnWidth = -1;
+    private int spanCount = 0;
+
+    public AutofitRecyclerView(Context context) {
+        super(context);
+        init(context, null);
+    }
+
+    public AutofitRecyclerView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs);
+    }
+
+    public AutofitRecyclerView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context, attrs);
+    }
+
+    private void init(Context context, AttributeSet attrs) {
+        if (attrs != null) {
+            int[] attrsArray = {
+                    android.R.attr.columnWidth
+            };
+            TypedArray array = context.obtainStyledAttributes(attrs, attrsArray);
+            columnWidth = array.getDimensionPixelSize(0, -1);
+            array.recycle();
+        }
+
+        manager = new GridLayoutManager(getContext(), 1);
+        setLayoutManager(manager);
+    }
+
+    @Override
+    protected void onMeasure(int widthSpec, int heightSpec) {
+        super.onMeasure(widthSpec, heightSpec);
+        if (spanCount == 0 && columnWidth > 0) {
+            int spanCount = Math.max(1, getMeasuredWidth() / columnWidth);
+            manager.setSpanCount(spanCount);
+        }
+    }
+
+    public void setSpanCount(int spanCount) {
+        this.spanCount = spanCount;
+        if (spanCount > 0) {
+            manager.setSpanCount(spanCount);
+        }
+    }
+
+}