rooms-android/app/src/main/java/com/nextcloud/talk/models/TakePictureViewModel.java

/*
 * Nextcloud Talk application
 *
 * @author Andy Scherzinger
 * @author Stefan Niedermann
 * Copyright (C) 2021 Andy Scherzinger <info@andy-scherzinger.de>
 * Copyright (C) 2021 Stefan Niedermann <info@niedermann.it>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.nextcloud.talk.models;

import com.nextcloud.talk.R;

import androidx.annotation.NonNull;
import androidx.camera.core.CameraSelector;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.Transformations;
import androidx.lifecycle.ViewModel;

import static androidx.camera.core.CameraSelector.DEFAULT_BACK_CAMERA;
import static androidx.camera.core.CameraSelector.DEFAULT_FRONT_CAMERA;

public class TakePictureViewModel extends ViewModel {

    @NonNull
    private CameraSelector cameraSelector = DEFAULT_BACK_CAMERA;
    @NonNull
    private final MutableLiveData<Integer> cameraSelectorToggleButtonImageResource =
        new MutableLiveData<>(R.drawable.ic_baseline_camera_front_24);
    @NonNull
    private final MutableLiveData<Boolean> torchEnabled = new MutableLiveData<>(false);

    @NonNull
    public CameraSelector getCameraSelector() {
        return this.cameraSelector;
    }

    public LiveData<Integer> getCameraSelectorToggleButtonImageResource() {
        return this.cameraSelectorToggleButtonImageResource;
    }

    public void toggleCameraSelector() {
        if (this.cameraSelector == DEFAULT_BACK_CAMERA) {
            this.cameraSelector = DEFAULT_FRONT_CAMERA;
            this.cameraSelectorToggleButtonImageResource.postValue(R.drawable.ic_baseline_camera_rear_24);
        } else {
            this.cameraSelector = DEFAULT_BACK_CAMERA;
            this.cameraSelectorToggleButtonImageResource.postValue(R.drawable.ic_baseline_camera_front_24);
        }
    }

    public void toggleTorchEnabled() {
        //noinspection ConstantConditions
        this.torchEnabled.postValue(!this.torchEnabled.getValue());
    }

    public LiveData<Boolean> isTorchEnabled() {
        return this.torchEnabled;
    }

    public LiveData<Integer> getTorchToggleButtonImageResource() {
        return Transformations.map(isTorchEnabled(), enabled -> enabled
            ? R.drawable.ic_baseline_flash_off_24
            : R.drawable.ic_baseline_flash_on_24);
    }
}