Add preferences ui for the library categories setting

app/src/main/java/com/kabouzeid/gramophone/preferences/LibraryPreference.java

@@ -0,0 +1,24 @@
+package com.kabouzeid.gramophone.preferences;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import com.kabouzeid.appthemehelper.common.prefs.supportv7.ATEDialogPreference;
+
+public class LibraryPreference extends ATEDialogPreference {
+    public LibraryPreference(Context context) {
+        super(context);
+    }
+
+    public LibraryPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public LibraryPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public LibraryPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+}

app/src/main/java/com/kabouzeid/gramophone/preferences/LibraryPreferenceDialog.java

@@ -0,0 +1,108 @@
+package com.kabouzeid.gramophone.preferences;
+
+import android.app.Dialog;
+import android.content.res.ColorStateList;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v4.app.DialogFragment;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+import android.view.LayoutInflater;
+import android.view.View;
+
+import com.afollestad.materialdialogs.DialogAction;
+import com.afollestad.materialdialogs.MaterialDialog;
+import com.afollestad.materialdialogs.util.DialogUtils;
+import com.kabouzeid.appthemehelper.ThemeStore;
+import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.adapter.CategoryAdapter;
+import com.kabouzeid.gramophone.model.Category;
+import com.kabouzeid.gramophone.util.PreferenceUtil;
+import com.kabouzeid.gramophone.util.SwipeAndDragHelper;
+
+import java.util.ArrayList;
+
+
+public class LibraryPreferenceDialog extends DialogFragment {
+    public static LibraryPreferenceDialog newInstance() {
+        return new LibraryPreferenceDialog();
+    }
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        LayoutInflater inflater = getActivity().getLayoutInflater();
+        View view = inflater.inflate(R.layout.preference_dialog_library_categories, null);
+
+        final ArrayList<Category> categories = PreferenceUtil.getInstance(getContext()).getLibraryCategories();
+        RecyclerView categoriesView = view.findViewById(R.id.recycler_view);
+        categoriesView.setLayoutManager(new LinearLayoutManager(getActivity()));
+        final CategoryAdapter adapter = new CategoryAdapter(categories, getCheckboxColors());
+        SwipeAndDragHelper swipeAndDragHelper = new SwipeAndDragHelper(adapter);
+        ItemTouchHelper touchHelper = new ItemTouchHelper(swipeAndDragHelper);
+        adapter.setTouchHelper(touchHelper);
+        categoriesView.setAdapter(adapter);
+        touchHelper.attachToRecyclerView(categoriesView);
+
+        MaterialDialog dialog = new MaterialDialog.Builder(getContext())
+                .title(R.string.library_categories)
+                .customView(view, false)
+                .positiveText(android.R.string.ok)
+                .negativeText(android.R.string.cancel)
+                .neutralText(R.string.reset_action)
+                .autoDismiss(false)
+                .onNeutral((dialog1, action) -> {
+                    adapter.setCategories(PreferenceUtil.getInstance(getContext()).getDefaultLibraryCategories());
+                })
+                .onNegative((dialog12, action) -> dismiss())
+                .onPositive((dialog13, action) -> {
+                    if (!updateCategories(adapter.getCategories())) {
+                        new MaterialDialog.Builder(getContext())
+                            .title(R.string.edit_categories)
+                            .content(R.string.at_least_one_category_must_be_enabled)
+                            .positiveText(android.R.string.ok)
+                            .show();
+                    } else {
+                        dismiss();
+                    }
+                })
+                .build();
+
+        return dialog;
+    }
+
+    private boolean updateCategories(ArrayList<Category> categories) {
+        if (getSelected(categories) == 0) return false;
+
+        PreferenceUtil.getInstance(getContext()).setLibraryCategories(categories);
+
+        return true;
+    }
+
+    private int getSelected(ArrayList<Category> categories) {
+        int selected = 0;
+        for (Category category : categories) {
+            if (category.visible)
+                selected ++;
+        }
+        return selected;
+    }
+
+    private ColorStateList getCheckboxColors() {
+        int disabledColor = DialogUtils.getDisabledColor(getContext());
+        return new ColorStateList(
+                new int[][] {
+                    new int[] {android.R.attr.state_enabled, -android.R.attr.state_checked},
+                    new int[] {android.R.attr.state_enabled, android.R.attr.state_checked},
+                    new int[] {-android.R.attr.state_enabled, -android.R.attr.state_checked},
+                    new int[] {-android.R.attr.state_enabled, android.R.attr.state_checked}
+                },
+                new int[] {
+                    DialogUtils.resolveColor(getContext(), R.attr.colorControlNormal),
+                    ThemeStore.accentColor(getContext()),
+                    disabledColor,
+                    disabledColor
+                });
+    }
+}