GifView.java

package br.com.catbag.gifreduxsample.ui.views;

import android.content.Context;
import android.support.v4.content.ContextCompat;
import android.util.AttributeSet;

import br.com.catbag.gifreduxsample.R;
import br.com.catbag.gifreduxsample.actions.GifActionCreator;
import br.com.catbag.gifreduxsample.models.AppState;
import br.com.catbag.gifreduxsample.models.Gif;
import br.com.catbag.gifreduxsample.models.ImmutableGif;
import pl.droidsonroids.gif.GifDrawable;

import static br.com.catbag.gifreduxsample.models.Gif.Status.DOWNLOADING;
import static br.com.catbag.gifreduxsample.models.Gif.Status.DOWNLOAD_FAILED;
import static br.com.catbag.gifreduxsample.models.Gif.Status.LOOPING;
import static br.com.catbag.gifreduxsample.models.Gif.Status.NOT_DOWNLOADED;
import static trikita.anvil.BaseDSL.visibility;
import static trikita.anvil.BaseDSL.withId;
import static trikita.anvil.BaseDSL.xml;
import static trikita.anvil.DSL.backgroundColor;
import static trikita.anvil.DSL.imageDrawable;
import static trikita.anvil.DSL.onClick;

/**
 Copyright 26/10/2016
 Felipe Piñeiro (fpbitencourt@gmail.com),
 Nilton Vasques (nilton.vasques@gmail.com) and
 Raul Abreu (raulccabreu@gmail.com)

 Be free to ask for help, email us!

 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.
 **/

public class GifView extends ReactiveView {

    private Gif mGif;
    private GifDrawable mGifDrawable;
    private boolean mHasRequestedDownload = false;

    public GifView(Context context) {
        super(context);
    }

    public GifView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public GifView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public GifView withGif(Gif gif) {
        if (gif != null) {
            if (!gif.getUuid().equals(mGif.getUuid())) mHasRequestedDownload = false;
            mGif = gif;
        }
        return this;
    }

    public GifView withGifDrawable(GifDrawable gifDrawable) {
        mGifDrawable = gifDrawable;
        return this;
    }

    public Gif getGif() {
        return mGif;
    }

    @Override
    public void view() {
        xml(R.layout.gif_item, () -> {
            setBackground();
            withId(R.id.gif_image, () -> {
                imageDrawable(mGifDrawable);
                requestContent();
                defineBehavior();
            });
            withId(R.id.gif_loading, () -> visibility(mGif.getStatus() == DOWNLOADING));
        });
        onAnvilRendered();
    }

    @Override
    public boolean hasStateChanged(AppState newState, AppState oldState) {
        Gif newGif = newState.getGifs().get(mGif.getUuid());
        return newGif != null && !newGif.equals(mGif);
    }

    @Override
    public void onStateChanged(AppState appState) {
        withGif(appState.getGifs().get(mGif.getUuid()));

        if (mGif.getStatus() == DOWNLOAD_FAILED) {
            mHasRequestedDownload = false;
        }
    }

    @Override
    protected void initialState() {
        super.initialState();
        mGif = ImmutableGif.builder().url("").path("").title("").uuid("")
                .build();
    }

    private void setBackground() {
        if (mGif.getStatus() == DOWNLOAD_FAILED) {
            backgroundColor(ContextCompat.getColor(getContext(), R.color.error));
            return;
        }

        if (mGif.getWatched()) {
            backgroundColor(ContextCompat.getColor(getContext(), R.color.watched));
        } else {
            backgroundColor(ContextCompat.getColor(getContext(), R.color.notWatched));
        }
    }

    private void requestContent() {
        if (mGif.getStatus() == NOT_DOWNLOADED && !mHasRequestedDownload) {
            mHasRequestedDownload = true;
            GifActionCreator.getInstance().gifDownloadStart(mGif);
        }
    }

    private void defineBehavior() {
        if (mGifDrawable != null) {
            if (mGif.getStatus() == LOOPING) {
                mGifDrawable.start();
            } else {

                mGifDrawable.stop();
            }
            onClick(v -> GifActionCreator.getInstance().gifClick(mGif));
        }
    }
}