Android Open Source - RetroTimer Timer Set View

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Back to project page RetroTimer.
License

The source code is released under:
GNU General Public License
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Java Source Code

/*
 * Copyright (C) 2010-2014  Eric Hansander
 */*from w ww .j av a 2 s .  com*/
 *  This file is part of Retro Timer.
 *
 *  Retro Timer 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.
 *
 *  Retro Timer 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 Retro Timer.  If not, see <http://www.gnu.org/licenses/>.
 */

package se.erichansander.retrotimer;

import android.content.Context;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;

/**
 * Special view for displaying a timer, and for receiving touch events to turn
 * the timer dial.
 */
public class TimerSetView extends TimerView {

    private TimerSetListener mListener;
    private GestureDetector mGestures;

    private boolean mBeingChanged = false;
    private long mMillisLeftBefore = 0;

    public interface TimerSetListener {
        abstract void onTimerTempValue(long millis);

        abstract void onTimerSetValue(long millis);
    }

    public TimerSetView(Context context, AttributeSet attrs) {
        super(context, attrs);

        mGestures = new GestureDetector(context, new TimerGestureListener(this));
        mGestures.setIsLongpressEnabled(false);
    }

    public void setTimerSetListener(TimerSetListener listener) {
        mListener = listener;
    }

    private void onTurn(float dx) {
        final float scale = getContext().getResources().getDisplayMetrics().density;

        float w = this.getWidth() * scale;
        dx *= scale;

        if (mBeingChanged == false) {
            mMillisLeftBefore = mMillisLeft;
            mBeingChanged = true;
        }

        mMillisLeft = mMillisLeftBefore + Math.round((-dx / w) * 15f * 60000f);

        // Round to the closest full minute
        mMillisLeft = Math.round(mMillisLeft / 60000f) * 60000;

        if (mMillisLeft <= 0) {
            mMillisLeft = 0;
        } else if (mMillisLeft > TIMER_MAX_MINS * 60000) {
            mMillisLeft = TIMER_MAX_MINS * 60000;
        }

        mListener.onTimerTempValue(mMillisLeft);
    }

    private void onSet() {
        mListener.onTimerSetValue(mMillisLeft);
        mBeingChanged = false;
        mMillisLeftBefore = 0;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean retVal = mGestures.onTouchEvent(event);

        int action = event.getAction();
        if (action == MotionEvent.ACTION_UP
                || action == MotionEvent.ACTION_CANCEL) {
            // Helper method to detect when scrolling is finished
            onSet();
            retVal = true;
        }

        return retVal;
    }

    private class TimerGestureListener extends
            GestureDetector.SimpleOnGestureListener {

        private TimerSetView mView;

        public TimerGestureListener(TimerSetView view) {
            this.mView = view;
        }

        // For some reason, this method must return true for onScroll to be
        // called?!
        @Override
        public boolean onDown(MotionEvent e) {
            return true;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2,
                final float velocityX, final float velocityY) {
            return true;
        }

        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2,
                float distanceX, float distanceY) {
            mView.onTurn(e2.getX() - e1.getX());
            return true;
        }
    }
}
Java Source Code List
