Merge "Add AvailableVirtualKeyboardFragment to TV" into oc-dev

         [CHAR LIMIT=35] -->

    <string name="use_system_language_to_select_input_method_subtypes">Use system languages</string>

    <!-- Toast that settings for an application is failed to open. -->

    <string name="failed_to_open_app_settings_toast">Failed to open settings for <xliff:g id="spell_application_name">%1$s</xliff:g></string>

    <!-- Warning message about security implications of enabling an input method, displayed as a dialog

         message when the user selects to enable an IME. -->

    <string name="ime_security_warning">This input method may be able to collect

        all the text you type, including personal data like passwords and credit

        card numbers.  It comes from the app

        <xliff:g id="ime_application_name">%1$s</xliff:g>.

        Use this input method?</string>

    <!-- [CHAR LIMIT=NONE] Dialog body explaining that the app just selected by the user will not work after a reboot until until after the user enters their credentials, such as a PIN or password. -->

    <string name="direct_boot_unaware_dialog_message">Note: After a reboot, this app can\'t start until you unlock your phone</string>

</resources>

/*

 * Copyright (C) 2017 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.settingslib.inputmethod;

import static com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;

import android.app.AlertDialog;

import android.content.ActivityNotFoundException;

import android.content.Context;

import android.content.Intent;

import android.content.res.Configuration;

import android.os.UserHandle;

import android.support.v7.preference.Preference;

import android.support.v7.preference.Preference.OnPreferenceChangeListener;

import android.support.v7.preference.Preference.OnPreferenceClickListener;

import android.text.TextUtils;

import android.util.Log;

import android.view.inputmethod.InputMethodInfo;

import android.view.inputmethod.InputMethodManager;

import android.view.inputmethod.InputMethodSubtype;

import android.widget.Toast;

import com.android.internal.inputmethod.InputMethodUtils;

import com.android.settingslib.R;

import com.android.settingslib.RestrictedLockUtils;

import com.android.settingslib.RestrictedSwitchPreference;

import java.text.Collator;

import java.util.List;

/**

 * Input method preference.

 *

 * This preference represents an IME. It is used for two purposes. 1) An instance with a switch

 * is used to enable or disable the IME. 2) An instance without a switch is used to invoke the

 * setting activity of the IME.

 */

public class InputMethodPreference extends RestrictedSwitchPreference implements OnPreferenceClickListener,

        OnPreferenceChangeListener {

    private static final String TAG = InputMethodPreference.class.getSimpleName();

    private static final String EMPTY_TEXT = "";

    private static final int NO_WIDGET = 0;

    public interface OnSavePreferenceListener {

        /**

         * Called when this preference needs to be saved its state.

         *

         * Note that this preference is non-persistent and needs explicitly to be saved its state.

         * Because changing one IME state may change other IMEs' state, this is a place to update

         * other IMEs' state as well.

         *

         * @param pref This preference.

         */

        void onSaveInputMethodPreference(InputMethodPreference pref);

    }

    private final InputMethodInfo mImi;

    private final boolean mHasPriorityInSorting;

    private final OnSavePreferenceListener mOnSaveListener;

    private final InputMethodSettingValuesWrapper mInputMethodSettingValues;

    private final boolean mIsAllowedByOrganization;

    private AlertDialog mDialog = null;

    /**

     * A preference entry of an input method.

     *

     * @param context The Context this is associated with.

     * @param imi The {@link InputMethodInfo} of this preference.

     * @param isImeEnabler true if this preference is the IME enabler that has enable/disable

     *     switches for all available IMEs, not the list of enabled IMEs.

     * @param isAllowedByOrganization false if the IME has been disabled by a device or profile

     *     owner.

     * @param onSaveListener The listener called when this preference has been changed and needs

     *     to save the state to shared preference.

     */

    public InputMethodPreference(final Context context, final InputMethodInfo imi,

            final boolean isImeEnabler, final boolean isAllowedByOrganization,

            final OnSavePreferenceListener onSaveListener) {

        super(context);

        setPersistent(false);

        mImi = imi;

        mIsAllowedByOrganization = isAllowedByOrganization;

        mOnSaveListener = onSaveListener;

        if (!isImeEnabler) {

            // Remove switch widget.

            setWidgetLayoutResource(NO_WIDGET);

        }

        // Disable on/off switch texts.

        setSwitchTextOn(EMPTY_TEXT);

        setSwitchTextOff(EMPTY_TEXT);

        setKey(imi.getId());

        setTitle(imi.loadLabel(context.getPackageManager()));

        final String settingsActivity = imi.getSettingsActivity();

        if (TextUtils.isEmpty(settingsActivity)) {

            setIntent(null);

        } else {

            // Set an intent to invoke settings activity of an input method.

            final Intent intent = new Intent(Intent.ACTION_MAIN);

            intent.setClassName(imi.getPackageName(), settingsActivity);

            setIntent(intent);

        }

        mInputMethodSettingValues = InputMethodSettingValuesWrapper.getInstance(context);

        mHasPriorityInSorting = InputMethodUtils.isSystemIme(imi)

                && mInputMethodSettingValues.isValidSystemNonAuxAsciiCapableIme(imi, context);

        setOnPreferenceClickListener(this);

        setOnPreferenceChangeListener(this);

    }

    public InputMethodInfo getInputMethodInfo() {

        return mImi;

    }

    private boolean isImeEnabler() {

        // If this {@link SwitchPreference} doesn't have a widget layout, we explicitly hide the

        // switch widget at constructor.

        return getWidgetLayoutResource() != NO_WIDGET;

    }

    @Override

    public boolean onPreferenceChange(final Preference preference, final Object newValue) {

        // Always returns false to prevent default behavior.

        // See {@link TwoStatePreference#onClick()}.

        if (!isImeEnabler()) {

            // Prevent disabling an IME because this preference is for invoking a settings activity.

            return false;

        }

        if (isChecked()) {

            // Disable this IME.

            setCheckedInternal(false);

            return false;

        }

        if (InputMethodUtils.isSystemIme(mImi)) {

            // Enable a system IME. No need to show a security warning dialog,

            // but we might need to prompt if it's not Direct Boot aware.

            // TV doesn't doesn't need to worry about this, but other platforms should show

            // a warning.

            if (mImi.getServiceInfo().directBootAware || isTv()) {

                setCheckedInternal(true);

            } else if (!isTv()){

                showDirectBootWarnDialog();

            }

        } else {

            // Once security is confirmed, we might prompt if the IME isn't

            // Direct Boot aware.

            showSecurityWarnDialog();

        }

        return false;

    }

    @Override

    public boolean onPreferenceClick(final Preference preference) {

        // Always returns true to prevent invoking an intent without catching exceptions.

        // See {@link Preference#performClick(PreferenceScreen)}/

        if (isImeEnabler()) {

            // Prevent invoking a settings activity because this preference is for enabling and

            // disabling an input method.

            return true;

        }

        final Context context = getContext();

        try {

            final Intent intent = getIntent();

            if (intent != null) {

                // Invoke a settings activity of an input method.

                context.startActivity(intent);

            }

        } catch (final ActivityNotFoundException e) {

            Log.d(TAG, "IME's Settings Activity Not Found", e);

            final String message = context.getString(

                    R.string.failed_to_open_app_settings_toast,

                    mImi.loadLabel(context.getPackageManager()));

            Toast.makeText(context, message, Toast.LENGTH_LONG).show();

        }

        return true;

    }

    public void updatePreferenceViews() {

        final boolean isAlwaysChecked = mInputMethodSettingValues.isAlwaysCheckedIme(

                mImi, getContext());

        // When this preference has a switch and an input method should be always enabled,

        // this preference should be disabled to prevent accidentally disabling an input method.

        // This preference should also be disabled in case the admin does not allow this input

        // method.

        if (isAlwaysChecked && isImeEnabler()) {

            setDisabledByAdmin(null);

            setEnabled(false);

        } else if (!mIsAllowedByOrganization) {

            EnforcedAdmin admin =

                    RestrictedLockUtils.checkIfInputMethodDisallowed(getContext(),

                            mImi.getPackageName(), UserHandle.myUserId());

            setDisabledByAdmin(admin);

        } else {

            setEnabled(true);

        }

        setChecked(mInputMethodSettingValues.isEnabledImi(mImi));

        if (!isDisabledByAdmin()) {

            setSummary(getSummaryString());

        }

    }

    private InputMethodManager getInputMethodManager() {

        return (InputMethodManager)getContext().getSystemService(Context.INPUT_METHOD_SERVICE);

    }

    private String getSummaryString() {

        final InputMethodManager imm = getInputMethodManager();

        final List<InputMethodSubtype> subtypes = imm.getEnabledInputMethodSubtypeList(mImi, true);

        return InputMethodAndSubtypeUtil.getSubtypeLocaleNameListAsSentence(

                subtypes, getContext(), mImi);

    }

    private void setCheckedInternal(boolean checked) {

        super.setChecked(checked);

        mOnSaveListener.onSaveInputMethodPreference(InputMethodPreference.this);

        notifyChanged();

    }

    private void showSecurityWarnDialog() {

        if (mDialog != null && mDialog.isShowing()) {

            mDialog.dismiss();

        }

        final Context context = getContext();

        final AlertDialog.Builder builder = new AlertDialog.Builder(context);

        builder.setCancelable(true /* cancelable */);

        builder.setTitle(android.R.string.dialog_alert_title);

        final CharSequence label = mImi.getServiceInfo().applicationInfo.loadLabel(

                context.getPackageManager());

        builder.setMessage(context.getString(R.string.ime_security_warning, label));

        builder.setPositiveButton(android.R.string.ok, (dialog, which) -> {

            // The user confirmed to enable a 3rd party IME, but we might

            // need to prompt if it's not Direct Boot aware.

            // TV doesn't doesn't need to worry about this, but other platforms should show

            // a warning.

            if (mImi.getServiceInfo().directBootAware || isTv()) {

                setCheckedInternal(true);

            } else {

                showDirectBootWarnDialog();

            }

        });

        builder.setNegativeButton(android.R.string.cancel, (dialog, which) -> {

            // The user canceled to enable a 3rd party IME.

            setCheckedInternal(false);

        });

        mDialog = builder.create();

        mDialog.show();

    }

    private boolean isTv() {

        return (getContext().getResources().getConfiguration().uiMode

                & Configuration.UI_MODE_TYPE_MASK) == Configuration.UI_MODE_TYPE_TELEVISION;

    }

    private void showDirectBootWarnDialog() {

        if (mDialog != null && mDialog.isShowing()) {

            mDialog.dismiss();

        }

        final Context context = getContext();

        final AlertDialog.Builder builder = new AlertDialog.Builder(context);

        builder.setCancelable(true /* cancelable */);

        builder.setMessage(context.getText(R.string.direct_boot_unaware_dialog_message));

        builder.setPositiveButton(android.R.string.ok, (dialog, which) -> setCheckedInternal(true));

        builder.setNegativeButton(android.R.string.cancel,

                (dialog, which) -> setCheckedInternal(false));

        mDialog = builder.create();

        mDialog.show();

    }

    public int compareTo(final InputMethodPreference rhs, final Collator collator) {

        if (this == rhs) {

            return 0;

        }

        if (mHasPriorityInSorting == rhs.mHasPriorityInSorting) {

            final CharSequence t0 = getTitle();

            final CharSequence t1 = rhs.getTitle();

            if (TextUtils.isEmpty(t0)) {

                return 1;

            }

            if (TextUtils.isEmpty(t1)) {

                return -1;

            }

            return collator.compare(t0.toString(), t1.toString());

        }

        // Prefer always checked system IMEs

        return mHasPriorityInSorting ? -1 : 1;

    }

}