Android Open Source - bitfynd-wallet-android Currency Calculator Link

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2013-2014 the original author or authors.
 */*ww  w  .  j  a v  a 2 s  . co  m*/
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

package de.schildbach.wallet.ui;

import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import org.bitcoinj.core.Coin;
import org.bitcoinj.utils.ExchangeRate;
import org.bitcoinj.utils.Fiat;

import android.view.View;
import de.schildbach.wallet.ui.CurrencyAmountView.Listener;

/**
 * @author Andreas Schildbach
 */
public final class CurrencyCalculatorLink
{
  private final CurrencyAmountView btcAmountView;
  private final CurrencyAmountView localAmountView;

  private Listener listener = null;
  private boolean enabled = true;
  private ExchangeRate exchangeRate = null;
  private boolean exchangeDirection = true;

  private final CurrencyAmountView.Listener btcAmountViewListener = new CurrencyAmountView.Listener()
  {
    @Override
    public void changed()
    {
      if (btcAmountView.getAmount() != null)
        setExchangeDirection(true);
      else
        localAmountView.setHint(null);

      if (listener != null)
        listener.changed();
    }

    @Override
    public void focusChanged(final boolean hasFocus)
    {
      if (listener != null)
        listener.focusChanged(hasFocus);
    }
  };

  private final CurrencyAmountView.Listener localAmountViewListener = new CurrencyAmountView.Listener()
  {
    @Override
    public void changed()
    {
      if (localAmountView.getAmount() != null)
        setExchangeDirection(false);
      else
        btcAmountView.setHint(null);

      if (listener != null)
        listener.changed();
    }

    @Override
    public void focusChanged(final boolean hasFocus)
    {
      if (listener != null)
        listener.focusChanged(hasFocus);
    }
  };

  public CurrencyCalculatorLink(@Nonnull final CurrencyAmountView btcAmountView, @Nonnull final CurrencyAmountView localAmountView)
  {
    this.btcAmountView = btcAmountView;
    this.btcAmountView.setListener(btcAmountViewListener);

    this.localAmountView = localAmountView;
    this.localAmountView.setListener(localAmountViewListener);

    update();
  }

  public void setListener(@Nullable final Listener listener)
  {
    this.listener = listener;
  }

  public void setEnabled(final boolean enabled)
  {
    this.enabled = enabled;

    update();
  }

  public void setExchangeRate(@Nonnull final ExchangeRate exchangeRate)
  {
    this.exchangeRate = exchangeRate;

    update();
  }

  @CheckForNull
  public Coin getAmount()
  {
    if (exchangeDirection)
    {
      return (Coin) btcAmountView.getAmount();
    }
    else if (exchangeRate != null)
    {
      final Fiat localAmount = (Fiat) localAmountView.getAmount();
      try
      {
        return localAmount != null ? exchangeRate.fiatToCoin(localAmount) : null;
      }
      catch (ArithmeticException x)
      {
        return null;
      }
    }
    else
    {
      return null;
    }
  }

  public boolean hasAmount()
  {
    return getAmount() != null;
  }

  private void update()
  {
    btcAmountView.setEnabled(enabled);

    if (exchangeRate != null)
    {
      localAmountView.setEnabled(enabled);
      localAmountView.setCurrencySymbol(exchangeRate.fiat.currencyCode);

      if (exchangeDirection)
      {
        final Coin btcAmount = (Coin) btcAmountView.getAmount();
        if (btcAmount != null)
        {
          localAmountView.setAmount(null, false);
          localAmountView.setHint(exchangeRate.coinToFiat(btcAmount));
          btcAmountView.setHint(null);
        }
      }
      else
      {
        final Fiat localAmount = (Fiat) localAmountView.getAmount();
        if (localAmount != null)
        {
          localAmountView.setHint(null);
          btcAmountView.setAmount(null, false);
          try
          {
            btcAmountView.setHint(exchangeRate.fiatToCoin(localAmount));
          }
          catch (final ArithmeticException x)
          {
            btcAmountView.setHint(null);
          }
        }
      }
    }
    else
    {
      localAmountView.setEnabled(false);
      localAmountView.setHint(null);
      btcAmountView.setHint(null);
    }
  }

  public void setExchangeDirection(final boolean exchangeDirection)
  {
    this.exchangeDirection = exchangeDirection;

    update();
  }

  public boolean getExchangeDirection()
  {
    return exchangeDirection;
  }

  public View activeTextView()
  {
    if (exchangeDirection)
      return btcAmountView.getTextView();
    else
      return localAmountView.getTextView();
  }

  public void requestFocus()
  {
    activeTextView().requestFocus();
  }

  public void setBtcAmount(@Nonnull final Coin amount)
  {
    final Listener listener = this.listener;
    this.listener = null;

    btcAmountView.setAmount(amount, true);

    this.listener = listener;
  }

  public void setNextFocusId(final int nextFocusId)
  {
    btcAmountView.setNextFocusId(nextFocusId);
    localAmountView.setNextFocusId(nextFocusId);
  }
}

Java Source Code List

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