xref: /frameworks/support/design/src/android/support/design/internal/BottomNavigationPresenter.java

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.support.design.internal;

import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;

import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.annotation.NonNull;
import android.support.annotation.RestrictTo;
import android.support.v7.view.menu.MenuBuilder;
import android.support.v7.view.menu.MenuItemImpl;
import android.support.v7.view.menu.MenuPresenter;
import android.support.v7.view.menu.MenuView;
import android.support.v7.view.menu.SubMenuBuilder;
import android.view.ViewGroup;

/**
 * @hide
 */
@RestrictTo(LIBRARY_GROUP)
public class BottomNavigationPresenter implements MenuPresenter {
    private MenuBuilder mMenu;
    private BottomNavigationMenuView mMenuView;
    private boolean mUpdateSuspended = false;
    private int mId;

    public void setBottomNavigationMenuView(BottomNavigationMenuView menuView) {
        mMenuView = menuView;
    }

    @Override
    public void initForMenu(Context context, MenuBuilder menu) {
        mMenuView.initialize(mMenu);
        mMenu = menu;
    }

    @Override
    public MenuView getMenuView(ViewGroup root) {
        return mMenuView;
    }

    @Override
    public void updateMenuView(boolean cleared) {
        if (mUpdateSuspended) return;
        if (cleared) {
            mMenuView.buildMenuView();
        } else {
            mMenuView.updateMenuView();
        }
    }

    @Override
    public void setCallback(Callback cb) {}

    @Override
    public boolean onSubMenuSelected(SubMenuBuilder subMenu) {
        return false;
    }

    @Override
    public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {}

    @Override
    public boolean flagActionItems() {
        return false;
    }

    @Override
    public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) {
        return false;
    }

    @Override
    public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) {
        return false;
    }

    public void setId(int id) {
        mId = id;
    }

    @Override
    public int getId() {
        return mId;
    }

    @Override
    public Parcelable onSaveInstanceState() {
        SavedState savedState = new SavedState();
        savedState.selectedItemId = mMenuView.getSelectedItemId();
        return savedState;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        if (state instanceof SavedState) {
            mMenuView.tryRestoreSelectedItemId(((SavedState) state).selectedItemId);
        }
    }

    public void setUpdateSuspended(boolean updateSuspended) {
        mUpdateSuspended = updateSuspended;
    }

    static class SavedState implements Parcelable {
        int selectedItemId;

        SavedState() {}

        SavedState(Parcel in) {
            selectedItemId = in.readInt();
        }

        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(@NonNull Parcel out, int flags) {
            out.writeInt(selectedItemId);
        }

        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }
}