src/com/android/email/activity/setup/GeneralPreferences.java

/*
 * Copyright (C) 2010 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 com.android.email.activity.setup;

import android.content.ContentResolver;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceScreen;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import com.android.email.Preferences;
import com.android.email.R;
import com.android.email.provider.EmailProvider;
import com.android.mail.preferences.MailPrefs;
import com.android.mail.ui.settings.ClearPictureApprovalsDialogFragment;

public class GeneralPreferences extends EmailPreferenceFragment implements
        OnPreferenceChangeListener {

    private static final String PREFERENCE_KEY_AUTO_ADVANCE = "auto_advance";
    private static final String PREFERENCE_KEY_TEXT_ZOOM = "text_zoom";
    private static final String PREFERENCE_KEY_CONFIRM_DELETE = "confirm_delete";
    private static final String PREFERENCE_KEY_CONFIRM_SEND = "confirm_send";
    private static final String PREFERENCE_KEY_CONV_LIST_ICON = "conversation_list_icon";
    private static final String PREFERENCE_KEY_CONV_LIST_ATTACHMENT_PREVIEWS
            = "conversation_list_attachment_previews";

    private MailPrefs mMailPrefs;
    private Preferences mPreferences;
    private ListPreference mAutoAdvance;
    /**
     * TODO: remove this when we've decided for certain that an app setting is unnecessary
     * (b/5287963)
     */
    @Deprecated
    private ListPreference mTextZoom;
    private CheckBoxPreference mConfirmDelete;
    private CheckBoxPreference mConfirmSend;
    private ListPreference mConvListIcon;
    private CheckBoxPreference mConvListAttachmentPreviews;
    private CheckBoxPreference mSwipeDelete;

    private boolean mSettingsChanged = false;

    CharSequence[] mSizeSummaries;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mMailPrefs = MailPrefs.get(getActivity());
        getPreferenceManager().setSharedPreferencesName(Preferences.PREFERENCES_FILE);

        // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.general_preferences);

        final PreferenceScreen ps = getPreferenceScreen();
        // Merely hide app pref for font size until we're sure it's unnecessary (b/5287963)
        ps.removePreference(findPreference(PREFERENCE_KEY_TEXT_ZOOM));
    }

    @Override
    public void onResume() {
        loadSettings();
        mSettingsChanged = false;
        super.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        if (mSettingsChanged) {
            // Notify the account list that we have changes
            ContentResolver resolver = getActivity().getContentResolver();
            resolver.notifyChange(EmailProvider.UIPROVIDER_ALL_ACCOUNTS_NOTIFIER, null);
        }
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        String key = preference.getKey();
        // Indicate we need to send notifications to UI
        mSettingsChanged = true;
        if (PREFERENCE_KEY_AUTO_ADVANCE.equals(key)) {
            mPreferences.setAutoAdvanceDirection(mAutoAdvance.findIndexOfValue((String) newValue));
            return true;
        } else if (PREFERENCE_KEY_TEXT_ZOOM.equals(key)) {
            mPreferences.setTextZoom(mTextZoom.findIndexOfValue((String) newValue));
            reloadDynamicSummaries();
            return true;
        } else if (MailPrefs.PreferenceKeys.DEFAULT_REPLY_ALL.equals(key)) {
            mMailPrefs.setDefaultReplyAll((Boolean) newValue);
            return true;
        } else if (PREFERENCE_KEY_CONV_LIST_ICON.equals(key)) {
            // TODO: Fix this to use a checkbox, instead of a list
            mMailPrefs.setShowSenderImages(
                    TextUtils.equals((String)newValue, Preferences.CONV_LIST_ICON_SENDER_IMAGE));
            return true;
        } else if (PREFERENCE_KEY_CONV_LIST_ATTACHMENT_PREVIEWS.equals(key)) {
            mMailPrefs.setShowAttachmentPreviews((Boolean) newValue);
            return true;
        }
        return false;
    }

    @Override
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
        if (getActivity() == null) {
            // Guard against monkeys.
            return false;
        }
        mSettingsChanged = true;
        String key = preference.getKey();
        if (PREFERENCE_KEY_CONFIRM_DELETE.equals(key)) {
            mPreferences.setConfirmDelete(mConfirmDelete.isChecked());
            return true;
        } else if (PREFERENCE_KEY_CONFIRM_SEND.equals(key)) {
            mPreferences.setConfirmSend(mConfirmSend.isChecked());
            return true;
        } else if (MailPrefs.PreferenceKeys.CONVERSATION_LIST_SWIPE.equals(key)) {
            mMailPrefs.setConversationListSwipeEnabled(mSwipeDelete.isChecked());
            return true;
        }
        return false;
    }

    private void loadSettings() {
        mPreferences = Preferences.getPreferences(getActivity());
        mAutoAdvance = (ListPreference) findPreference(PREFERENCE_KEY_AUTO_ADVANCE);
        mAutoAdvance.setValueIndex(mPreferences.getAutoAdvanceDirection());
        mAutoAdvance.setOnPreferenceChangeListener(this);

        mTextZoom = (ListPreference) findPreference(PREFERENCE_KEY_TEXT_ZOOM);
        if (mTextZoom != null) {
            mTextZoom.setValueIndex(mPreferences.getTextZoom());
            mTextZoom.setOnPreferenceChangeListener(this);
        }

        mConvListIcon = (ListPreference) findPreference(PREFERENCE_KEY_CONV_LIST_ICON);
        if (mConvListIcon != null) {
            // TODO: Fix this to use a checkbox, instead of a list
            final boolean showSenderImage = mMailPrefs.getShowSenderImages();
            mConvListIcon.setValue(showSenderImage ?
                    Preferences.CONV_LIST_ICON_SENDER_IMAGE : Preferences.CONV_LIST_ICON_NONE);
            mConvListIcon.setOnPreferenceChangeListener(this);
        }

        mConvListAttachmentPreviews = (CheckBoxPreference) findPreference(
                PREFERENCE_KEY_CONV_LIST_ATTACHMENT_PREVIEWS);
        mConvListAttachmentPreviews.setChecked(mMailPrefs.getShowAttachmentPreviews());
        mConvListAttachmentPreviews.setOnPreferenceChangeListener(this);

        mConfirmDelete = (CheckBoxPreference) findPreference(PREFERENCE_KEY_CONFIRM_DELETE);
        mConfirmSend = (CheckBoxPreference) findPreference(PREFERENCE_KEY_CONFIRM_SEND);
        mSwipeDelete = (CheckBoxPreference)
                findPreference(MailPrefs.PreferenceKeys.CONVERSATION_LIST_SWIPE);
        mSwipeDelete.setChecked(mMailPrefs.getIsConversationListSwipeEnabled());

        final CheckBoxPreference replyAllPreference =
                (CheckBoxPreference) findPreference(MailPrefs.PreferenceKeys.DEFAULT_REPLY_ALL);
        replyAllPreference.setChecked(mMailPrefs.getDefaultReplyAll());
        replyAllPreference.setOnPreferenceChangeListener(this);

        reloadDynamicSummaries();
    }

    /**
     * Reload any preference summaries that are updated dynamically
     */
    private void reloadDynamicSummaries() {
        if (mTextZoom != null) {
            int textZoomIndex = mPreferences.getTextZoom();
            // Update summary - but only load the array once
            if (mSizeSummaries == null) {
                mSizeSummaries = getActivity().getResources()
                        .getTextArray(R.array.general_preference_text_zoom_summary_array);
            }
            CharSequence summary = null;
            if (textZoomIndex >= 0 && textZoomIndex < mSizeSummaries.length) {
                summary = mSizeSummaries[textZoomIndex];
            }
            mTextZoom.setSummary(summary);
        }
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        menu.clear();
        inflater.inflate(R.menu.general_prefs_fragment_menu, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.clear_picture_approvals_menu_item:
                clearDisplayImages();
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void clearDisplayImages() {
        final ClearPictureApprovalsDialogFragment fragment =
                ClearPictureApprovalsDialogFragment.newInstance();
        fragment.show(getActivity().getFragmentManager(),
                ClearPictureApprovalsDialogFragment.FRAGMENT_TAG);
    }

}