SliderNewModuleActivity.java

package edu.mit.mitmobile2;

import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.View;
import edu.mit.mitmobile2.MITSliderTitleBar.OnPreviousNextListener;
import edu.mit.mitmobile2.SliderView.Adapter;
import edu.mit.mitmobile2.SliderView.OnSeekListener;

public abstract class SliderNewModuleActivity extends NewModuleActivity {
	protected Context ctx;

	protected MITSliderTitleBar mSliderTitleBar;
	protected SliderView mSliderView;

	abstract protected SliderView.Adapter getSliderAdapter();

	protected int mStartPosition;
	protected int mLastSavedPosition;

	public static String KEY_POSITION = "start_position";
	public static final String KEY_POSITION_SAVED = "saved_start_position";

	protected String getCurrentHeaderTitle() {
		return "";
	}

	protected void onSliderSeek() {
		// default implementation does nothing
	}

	/****************************************************/
	@Override
	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);
		setContentView(R.layout.new_slider);
		mSliderTitleBar = new MITSliderTitleBar(this);
		getTitleBar().addSliderBar(mSliderTitleBar);

		mSliderView = (SliderView) findViewById(R.id.newSliderMainContent);

		ctx = this;

		mSliderView.setOnSeekListener(new OnSeekListener() {
			@Override
			public void onSeek(SliderView view, Adapter adapter) {
				mSliderTitleBar.enablePreviousButton(!view.isAtBeginning());
				mSliderTitleBar.enableNextButton(!view.isAtEnd());

				if (!view.isAtEnd() || !view.isAtBeginning()) {
					mSliderTitleBar.showPreviousNext();
					mSliderTitleBar.setVisibility(View.VISIBLE);
				} else {
					mSliderTitleBar.setVisibility(View.GONE);
				}

				mSliderTitleBar.setAllTitles(getPreviousTitle(),
						getCurrentHeaderTitle(), getNextTitle());

				onSliderSeek();
			}
		});

		reloadAdapter();

		mSliderTitleBar.setPreviousNextListener(new OnPreviousNextListener() {
			@Override
			public void onPreviousClicked() {
				mSliderView.slideLeft();
			}

			@Override
			public void onNextClicked() {
				mSliderView.slideRight();
			}
		});
	}

	protected void reloadAdapter() {
		Adapter adapter = getSliderAdapter();
		if (adapter != null) {
			mSliderView.setAdapter(getSliderAdapter());
		}
	}

	@Override
	public boolean dispatchKeyEvent(KeyEvent event) {
		if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
			mSliderView.slideLeft();
			return true;
		}

		if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_RIGHT) {
			mSliderView.slideRight();
			return true;
		}

		return super.dispatchKeyEvent(event);
	}

	@Override
	protected void onDestroy() {
		mSliderView.destroy();
		System.gc();
		super.onDestroy();
	}

	// protected void useSubtitles(String mainTitle) {
	// mSliderTitleBar.useSubtitleBar();
	// mSliderTitleBar.setTitle(mainTitle);
	// }

	@Override
	protected void onResume() {
		super.onResume();

		// not sure why, but sometimes when activities
		// are resumed it scrolls to the previous FrameLayout
		// this is a fix for that
		final int scrollX = mSliderView.getScrollX();
		final int scrollY = mSliderView.getScrollY();

		new Handler().postAtFrontOfQueue(new Runnable() {
			@Override
			public void run() {
				mSliderView.scrollTo(scrollX, scrollY);
			}
		});

	}

	protected void showLoading(String title) {
		FullScreenLoader loader = (FullScreenLoader) findViewById(R.id.newSliderActivityLoader);
		loader.setVisibility(View.VISIBLE);
		loader.showLoading();
		mSliderView.setVisibility(View.GONE);
		// mSliderTitleBar.setTitle(title);
	}

	protected void showLoadingError() {
		FullScreenLoader loader = (FullScreenLoader) findViewById(R.id.newSliderActivityLoader);
		loader.setVisibility(View.VISIBLE);
		loader.showError();
		mSliderView.setVisibility(View.GONE);
	}

	protected void showLoadingCompleted() {
		FullScreenLoader loader = (FullScreenLoader) findViewById(R.id.newSliderActivityLoader);
		loader.setVisibility(View.GONE);
		mSliderView.setVisibility(View.VISIBLE);
	}

	@Override
	public final boolean isScrollable() {
		return false;
	}

	public void refreshScreens() {
		mSliderView.refreshScreens();
	}

	protected String getPreviousTitle() {
		return "PREVIOUS";
	}

	protected String getNextTitle() {
		return "NEXT";
	}

	protected int getPositionValue() {
		if (mLastSavedPosition > 0) {
			return mLastSavedPosition;
		}

		Bundle extras = getIntent().getExtras();

		if (extras != null) {
			return extras.getInt(KEY_POSITION);
		} else {
			return 0;
		}
	}

}