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/****************************************************************************
Copyright 2006, Colorado School of Mines and others.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
****************************************************************************/
package edu.mines.jtk.mosaic;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import edu.mines.jtk.awt.Mode;
import edu.mines.jtk.awt.ModeManager;

/**
 * A mode for tracking the mouse location. When this mode is active,
 * then mouse movement within any tile is highlighted in any tile axes
 * in that tile's row and column. This mode is not exclusive.
 * @author Dave Hale, Colorado School of Mines
 * @version 2006.01.01
 */
public class MouseTrackMode extends Mode {
  private static final long serialVersionUID = 1L;

  /**
   * Constructs a mouse track mode with specified manager.
   * @param modeManager the mode manager for this mode.
   */
  public MouseTrackMode(ModeManager modeManager) {
    super(modeManager);
    setName("Track");
    setIcon(loadIcon(MouseTrackMode.class,"Track24.gif"));
    setMnemonicKey(KeyEvent.VK_Z);
    setAcceleratorKey(KeyStroke.getKeyStroke(KeyEvent.VK_T,0));
    setShortDescription("Track mouse in tile");
  }

  /**
   * Returns false, to indicate that mouse track mode is not exclusive.
   * @return false.
   */
  public boolean isExclusive() {
    return false;
  }

  ///////////////////////////////////////////////////////////////////////////
  // protected
  
  protected void setActive(Component component, boolean active) {
    if ((component instanceof Tile)) {
      if (active) {
        component.addMouseListener(_ml);
      } else {
        component.removeMouseListener(_ml);
      }
    }
  }

  ///////////////////////////////////////////////////////////////////////////
  // private

  private Tile _tile; // tile in which tracking; null, if not tracking.
  private int _xmouse; // x coordinate where mouse last tracked
  private int _ymouse; // y coordinate where mouse last tracked

  private MouseListener _ml = new MouseAdapter() {
    public void mouseEntered(MouseEvent e) {
      beginTracking(e);
    }
    public void mouseExited(MouseEvent e) {
      endTracking();
    }
  };

  private MouseMotionListener _mml = new MouseMotionAdapter() {
    public void mouseDragged(MouseEvent e) {
      duringTracking(e);
    }
    public void mouseMoved(MouseEvent e) {
      duringTracking(e);
    }
  };

  private void beginTracking(MouseEvent e) {
    _xmouse = e.getX();
    _ymouse = e.getY();
    _tile = (Tile)e.getSource();
    beginTracking(_tile.getTileAxisTop(),_xmouse,_ymouse);
    beginTracking(_tile.getTileAxisLeft(),_xmouse,_ymouse);
    beginTracking(_tile.getTileAxisBottom(),_xmouse,_ymouse);
    beginTracking(_tile.getTileAxisRight(),_xmouse,_ymouse);
    fireTrack();
    _tile.addMouseMotionListener(_mml);
  }
  private void beginTracking(TileAxis ta, int x, int y) {
    if (ta!=null)
      ta.beginTracking(x,y);
  }

  private void duringTracking(MouseEvent e) {
    _xmouse = e.getX();
    _ymouse = e.getY();
    _tile = (Tile)e.getSource();
    duringTracking(_tile.getTileAxisTop(),_xmouse,_ymouse);
    duringTracking(_tile.getTileAxisLeft(),_xmouse,_ymouse);
    duringTracking(_tile.getTileAxisBottom(),_xmouse,_ymouse);
    duringTracking(_tile.getTileAxisRight(),_xmouse,_ymouse);
    fireTrack();
  }
  private void duringTracking(TileAxis ta, int x, int y) {
    if (ta!=null)
      ta.duringTracking(x,y);
  }

  private void endTracking() {
    _tile.removeMouseMotionListener(_mml);
    endTracking(_tile.getTileAxisTop());
    endTracking(_tile.getTileAxisLeft());
    endTracking(_tile.getTileAxisBottom());
    endTracking(_tile.getTileAxisRight());
    fireTrack();
    _tile = null;
  }
  private void endTracking(TileAxis ta) {
    if (ta!=null)
      ta.endTracking();
  }

  // Someday this might fire mouse track events to any listeners.
  // Currently, this method does nothing.
  private void fireTrack() {
    /*
    if (_tile==null) {
    } else {
      Projector hp = _tile.getHorizontalProjector();
      Projector vp = _tile.getVerticalProjector();
      Transcaler ts = _tile.getTranscaler();
      double ux = ts.x(_xmouse);
      double uy = ts.y(_ymouse);
      double vx = hp.v(ux);
      double vy = vp.v(uy);
    }
    */
  }
}