SimpleButton.java

/*
 * Copyright (C) 2010 Geometer Plus <contact@geometerplus.com>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.android.fbreader.buttons;

import java.io.InputStream;

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.StateListDrawable;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;

abstract class SimpleButton extends AbstractButton {

	protected abstract String getImageId();

	private Drawable createDrawable(Context context, String id) {
		final String fileName = id + ".png";
		try {
			final String locale = context.getResources().getConfiguration().locale.getLanguage();
			final InputStream image = context.getAssets().open("buttons-" + locale + "/" + fileName);
			return BitmapDrawable.createFromStream(image, fileName);
		} catch (Exception e) {
		}
		try {
			final InputStream image = context.getAssets().open("buttons/" + fileName);
			return BitmapDrawable.createFromStream(image, fileName);
		} catch (Exception e) {
		}
		return null;
	}

	private Drawable createDrawableNormal(Context context) {
		final String id = getImageId();
		if (id == null) {
			return null;
		}
		return createDrawable(context, id);
	}

	private Drawable createDrawablePressed(Context context) {
		final String id = getImageId();
		if (id == null) {
			return null;
		}
		return createDrawable(context, id + "_focus");
	}

	private Drawable getImageDrawable(Context context) {
		final Drawable normal = createDrawableNormal(context);
		if (normal == null) {
			return null;
		}
		final Drawable pressed = createDrawablePressed(context);
		if (pressed == null) {
			return null;
		}
		android.graphics.drawable.StateListDrawable image = new StateListDrawable();
		image.addState(new int[]{-android.R.attr.state_pressed}, normal);
		image.addState(new int[]{android.R.attr.state_pressed}, pressed);
		return image;
	}

	protected View createViewInternal(final Context context) {
		final Drawable image = getImageDrawable(context);
		if (image == null) {
			return null;
		}
		final ImageButton view = new ImageButton(context);
		view.setImageDrawable(image);
		setDefaultListeners(view, context);
		return view;
	}

	private View myView;

	@Override
	public View createView(final Context context) {
		if (myView == null) {
			myView = createViewInternal(context);
			if (myView == null) {
				final Button view = new Button(context);
				view.setText(getCaption());
				setDefaultListeners(view, context);
				myView = view;
			}
			myView.setPadding(0, 0, 0, 0);
			myView.setLayoutParams(new ViewGroup.LayoutParams(96, 144));
		}
		return myView;
	}

	protected void updateView() {
		if (myView == null) {
			return;
		}
		if (myView instanceof ImageButton) {
			final Drawable image = getImageDrawable(myView.getContext());
			if (image != null) {
				((ImageButton)myView).setImageDrawable(image);
			}
		} else if (myView instanceof Button) {
			((Button)myView).setText(getCaption());
		}
		myView.invalidate();
	}
}