ScoreActivity.java

package com.xenoage.zong.android;

import static com.xenoage.utils.PlatformUtils.platformUtils;
import static com.xenoage.utils.kernel.Range.range;
import static com.xenoage.utils.log.Log.log;
import static com.xenoage.utils.log.Report.error;

import java.io.IOException;

import android.app.Activity;
import android.os.Bundle;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ZoomControls;

import com.github.ysamlan.horizontalpager.HorizontalPager;
import com.xenoage.utils.log.Log;
import com.xenoage.utils.log.Report;
import com.xenoage.utils.math.geom.Size2i;
import com.xenoage.zong.android.scoreview.ScreenViewBitmaps;
import com.xenoage.zong.documents.ScoreDoc;
import com.xenoage.zong.android.R;

/**
 * This activity displays a given score.
 * 
 * @author Andreas Wenger
 */
public class ScoreActivity
	extends Activity {

	private ScoreDoc scoreDoc = null;
	private ScreenViewBitmaps bitmaps = null;

	private boolean playing = false;

	private float[] scalings = { 0.1f, 0.2f, 0.4f, 0.7f, 1.1f, 1.5f, 2f, 3f, 5f };
	private int currentScalingIndex = 4;


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

		//layout and listeners
		setContentView(R.layout.score);
		registerListeners();

		//load score
		try {
			scoreDoc = App.load(getIntent().getStringExtra("filename"));
			App.getMidiPlayer().open(scoreDoc.getScore(), ScoreActivity.this);
			updateBitmaps();
		} catch (OutOfMemoryError ex) {
			showError("Not enough memory to load this score.");
		} catch (IOException ex) {
			showError("Could not load score.");
		} catch (Throwable t) {
			showError(platformUtils().getStackTraceString(t));
		}

		/*
		//load document in background thread, meanwhile show waiting text
		TextView tv = new TextView(this);
		tv.setText("Score is loaded...");
		setContentView(tv);

		new Thread()
		{

			@Override public void run()
			{
				//load document
				try {
					scoreDoc = App.load(getIntent().getStringExtra("filename"));
					App.getMidiPlayer().open(scoreDoc.getScore(), ScoreActivity.this);
					runOnUiThread(new Runnable()
					{
						@Override public void run()
						{
							View view = View.inflate(ScoreActivity.this, R.layout.score, null);
							//replace placeholder by real score view
							ScoreScreenView scoreView = new ScoreScreenView(ScoreActivity.this);
							scoreView.setLayoutParams(new LayoutParams(
								LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
							ViewGroup container = (ViewGroup) view.findViewById(R.id.score_container);
							container.removeAllViews();
							container.addView(scoreView);
							//register listeners
							registerListeners(view, scoreView);
							setContentView(view);
							scoreView.setScoreDoc(scoreDoc);
							scoreView.updateLayout();
						}
					});
				} catch (OutOfMemoryError ex) {
					showError("Not enough memory to load this score.");
				} catch (IOException ex) {
					showError("Could not load score.");
				} catch (Throwable t) {
					showError(ThrowableUtils.getStackTrace(t));
				}
			}
		}.start();
		*/

	}

	private void registerListeners() {
		//page switcher
		final HorizontalPager pager = (HorizontalPager) findViewById(R.id.score_pager);
		pager.setOnScreenSwitchListener(screen -> {
			int activePageIndex = screen;
			bitmaps.setActivePageIndex(activePageIndex);
			updatePager();
		});
		//zoom buttons
		final ZoomControls zoomControls = (ZoomControls) findViewById(R.id.score_zoom);
		zoomControls.setOnZoomInClickListener(view -> {
			if (currentScalingIndex + 1 < scalings.length) {
				currentScalingIndex++;
				updateBitmaps();
				//enable/disable buttons
				zoomControls.setIsZoomInEnabled(currentScalingIndex + 1 < scalings.length);
				zoomControls.setIsZoomOutEnabled(true);
			}
		});
		zoomControls.setOnZoomOutClickListener(view -> {
			if (currentScalingIndex > 0) {
				currentScalingIndex--;
				updateBitmaps();
				//enable/disable buttons
				zoomControls.setIsZoomInEnabled(true);
				zoomControls.setIsZoomOutEnabled(currentScalingIndex > 0);
			}
		});
		//play button
		final Button playbackButton = (Button) findViewById(R.id.score_playback);
		playbackButton.setOnClickListener(view -> {
			playback();
			playbackButton.setText(playing ? "Stop" : "Play");
		});
	}

	private void updateBitmaps() {
		bitmaps = new ScreenViewBitmaps(scoreDoc, getScreenSize(), scalings[currentScalingIndex],
			getResources());
		//fill pager
		HorizontalPager pager = (HorizontalPager) findViewById(R.id.score_pager);
		pager.removeAllViews();
		for (int iPage : range(bitmaps.getPagesCount())) {
			ImageView pageView = new ImageView(this);
			pageView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
				LayoutParams.MATCH_PARENT));
			pager.addView(pageView);
		}
		updatePager();
	}

	private void updatePager() {
		final HorizontalPager pager = (HorizontalPager) findViewById(R.id.score_pager);
		if (bitmaps != null) {
			int activePageIndex = pager.getCurrentScreen();
			for (int iPage : range(bitmaps.getPagesCount())) {
				ImageView pageView = (ImageView) pager.getChildAt(iPage);
				if (iPage < activePageIndex - 2 || iPage > activePageIndex + 1) {
					pageView.setImageBitmap(null);
				}
				else {
					pageView.setImageBitmap(bitmaps.getPageBitmap(iPage));
				}
			}
		}
	}

	private void playback() {
		if (!playing)
			App.getMidiPlayer().start();
		else
			App.getMidiPlayer().pause();
		playing = !playing;
	}

	private void showError(String text) {
		//show error in log
		log(error(text));
		//show error in text view
		final TextView tv = new TextView(ScoreActivity.this);
		tv.setText(text);
		runOnUiThread(() -> setContentView(tv));
	}

	@Override protected void onStop() {
		App.getMidiPlayer().stop();
		super.onStop();
	}

	private Size2i getScreenSize() {
		Display display = getWindowManager().getDefaultDisplay();
		return new Size2i(display.getWidth(), display.getHeight());
	}

}