org.tigase.mobile.MyFragmentPageAdapter.java Source code

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Here is the source code for org.tigase.mobile.MyFragmentPageAdapter.java

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/*
 * Tigase Mobile Messenger for Android
 * Copyright (C) 2011-2013 "Artur Hefczyc" <artur.hefczyc@tigase.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, version 3 of the License.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. Look for COPYING file in the top folder.
 * If not, see http://www.gnu.org/licenses/.
 */
package org.tigase.mobile;

import org.tigase.mobile.roster.RosterFragment;

import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

public abstract class MyFragmentPageAdapter extends FragmentStatePagerAdapter {

    private static final boolean DEBUG = false;

    private static final String TAG = "MyFragmentPageAdapter";

    private Fragment mCurrentPrimaryItem = null;

    private FragmentTransaction mCurTransaction = null;
    private final FragmentManager mFragmentManager;
    protected boolean refreshRoster;

    public MyFragmentPageAdapter(FragmentManager fm) {
        super(fm);
        this.mFragmentManager = fm;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        if (mCurTransaction == null) {
            mCurTransaction = mFragmentManager.beginTransaction();
        }
        if (DEBUG)
            Log.v(TAG, "Detaching item #" + position + ": f=" + object + " v=" + ((Fragment) object).getView());
        mCurTransaction.detach((Fragment) object);
        mCurTransaction.remove((Fragment) object);
    }

    @Override
    public void finishUpdate(ViewGroup container) {
        if (mCurTransaction != null) {
            mCurTransaction.commitAllowingStateLoss();
            mCurTransaction = null;
            mFragmentManager.executePendingTransactions();
        }
    }

    /**
     * Return the Fragment associated with a specified position.
     */
    @Override
    public abstract Fragment getItem(int position);

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        if (mCurTransaction == null) {
            mCurTransaction = mFragmentManager.beginTransaction();
        }

        // Do we already have this fragment?
        String name = makeFragmentName(container.getId(), position);
        Fragment fragment = mFragmentManager.findFragmentByTag(name);

        if (refreshRoster && fragment instanceof RosterFragment) {
            refreshRoster = false;
            mCurTransaction.detach(fragment);
            fragment = null;
        }

        if (fragment != null) {
            if (DEBUG)
                Log.v(TAG, "Attaching item #" + position + ": f=" + fragment);
            mCurTransaction.attach(fragment);
        } else {
            fragment = getItem(position);
            if (DEBUG)
                Log.v(TAG, "Adding item #" + position + ": f=" + fragment);
            int containerId = container.getId();
            String fragmentName = makeFragmentName(container.getId(), position);
            mCurTransaction.add(containerId, fragment, fragmentName);
        }
        if (fragment != mCurrentPrimaryItem) {
            fragment.setMenuVisibility(false);
            fragment.setUserVisibleHint(false);
        }

        return fragment;
    }

    public boolean isRefreshRoster() {
        return refreshRoster;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return ((Fragment) object).getView() == view;
    }

    protected String makeFragmentName(int viewId, int index) {
        return "android:switcher:" + viewId + ":" + index;
    }

    @Override
    public void restoreState(Parcelable state, ClassLoader loader) {
    }

    @Override
    public Parcelable saveState() {
        return null;
    }

    @Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        Fragment fragment = (Fragment) object;
        if (fragment != mCurrentPrimaryItem) {
            if (mCurrentPrimaryItem != null) {
                mCurrentPrimaryItem.setMenuVisibility(false);
                mCurrentPrimaryItem.setUserVisibleHint(false);
            }
            if (fragment != null) {
                fragment.setMenuVisibility(true);
                fragment.setUserVisibleHint(true);
            }
            mCurrentPrimaryItem = fragment;
        }
    }

    public void setRefreshRoster(boolean refreshRoster) {
        this.refreshRoster = refreshRoster;
    }

    @Override
    public void startUpdate(ViewGroup container) {
    }
}