MainPanel.java

package co.forsaken.projectindigo.gui;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

import javax.swing.JPanel;
import javax.swing.Timer;

import co.forsaken.projectindigo.IndigoLauncher;
import co.forsaken.projectindigo.gui.components.Image;
import co.forsaken.projectindigo.utils.Utils;
import co.forsaken.projectindigo.utils.Utils.OS;

@SuppressWarnings("serial") public class MainPanel extends JPanel {

  public static final Color         BORDER_COLOUR    = new Color(45, 45, 45, 130);
  public static final Color         HIGHLIGHT_COLOUR = new Color(13, 86, 166, 200);

  public static final int           PADDING          = 10;
  public static final Dimension     BTN_SIZE         = new Dimension(110, 24);
  private static final int          PLAY_TIME        = 300;

  protected final IndigoLauncher    _launcher;

  protected Map<Integer, BasePanel> _panels          = new HashMap<Integer, BasePanel>();

  private int                       _startX;
  private int                       _targetX;
  private int                       _currentPage     = -1;
  private long                      _startTime;
  private int                       _width;
  private int                       _height;

  public MainPanel(IndigoLauncher launcher, int width, int height) {
    _launcher = launcher;
    setLayout(null);
    setOpaque(false);
    if (Utils.getCurrentOS() == OS.MACOSX) {
      height -= 20;
    } else if (Utils.getCurrentOS() == OS.WINDOWS) {
      height -= 25;
    }
    _width = width;
    _height = height;
    setFont(IndigoLauncher.getMinecraftFont(14));
    Dimension dim = new Dimension(_width, _height);
    setSize(dim);
    setPreferredSize(dim);
    setBounds(0, 0, _width, _height);
    setupLook();
  }

  public BasePanel getPanel(int id) {
    return _panels.get(id);
  }

  public void setupLook() {
    setLayout(null);
    _panels.put(-1, new ProgressPanel(this));
    _panels.put(0, new LoginPanel(this));
    _panels.put(1, new ServerBasePanel(this));
    _panels.put(3, new SettingsPanel(this));

    for (BasePanel p : _panels.values()) {
      add(p);
    }
    ((LoginPanel) _panels.get(0)).loadUserManager();

    add(new Image("bg", getWidth(), getHeight()));
  }

  private Timer currentTimer = null;

  public void switchPage(final int pageTo) {
    _startX = _panels.get(pageTo).getX();
    _targetX = 0;
    int dist = _targetX - _startX;
    final double accel = 2 * dist * Math.pow(PLAY_TIME, -2);
    if (currentTimer != null) {
      currentTimer.stop();
      currentTimer = null;
    }
    currentTimer = new Timer(15, new ActionListener() {
      double location = _startX;
      double velocity = 0;
      long   lastTime = 0;

      public void actionPerformed(ActionEvent e) {
        if (lastTime == 0) {
          lastTime = System.currentTimeMillis();
        }
        long deltaTime = lastTime - System.currentTimeMillis();
        velocity += (accel * (double) deltaTime);
        location += (velocity * (double) deltaTime);

        lastTime = System.currentTimeMillis();
        if (!_panels.get(pageTo).isVisible()) {
          _panels.get(pageTo).setVisible(true);
        }
        _panels.get(pageTo).setLocation((int) location, 0);
        if (pageTo == -1 || (pageTo > _currentPage && _currentPage != -1)) {
          _panels.get(_currentPage).setLocation((int) (Math.round(location) - _width), 0);
        } else {
          _panels.get(_currentPage).setLocation(getWidth() + (int) Math.round(location), 0);
        }
        if (System.currentTimeMillis() - _startTime > PLAY_TIME) {
          _panels.get(pageTo).setLocation(_targetX, 0);

          if (pageTo == -1 || (pageTo > _currentPage && _currentPage != -1)) {
            _panels.get(_currentPage).setLocation(0 - _width, 0);
          } else {
            _panels.get(_currentPage).setLocation(_width, 0);
          }
          _panels.get(_currentPage).setVisible(false);

          _panels.get(pageTo).onSwitch();
          _currentPage = pageTo;
          currentTimer.stop();
          currentTimer = null;
        }
      }
    });
    _startTime = System.currentTimeMillis();
    currentTimer.start();
  }
}