/* Copyright 1996 Matthew Freedman and University of Washington
              mattf@cac.washington.edu

   This program may be freely used, modified, or redistributed for
   any non-commercial purpose as long as credit is given.

   This file contains the ColorFrame, ColorFrameRow, WideScroll,
   and WideLabel classes.
 */
import java.awt.*;
import java.util.*;

/* A simple HSB color picker in a pop-up frame. It uses a hard-wired Nina 
   figure to show the current color. 
 */
public class ColorFrame extends Frame {
  Nina nina = new Nina();
  NinaParams p = new NinaParams();
  Panel lpanel, rpanel, btn_panel;
  ColorFrameRow hue, sat, bright;
  Button ok, cancel;
  Color cur_color;
  float[] HSB;
  PaletteController parent;
  int which_button;

  /* Constructor, need a title string an initial color, a parent,
     and a handle to the button on the parent that needs to be
     changed. */
  public ColorFrame(String s, Color color, PaletteController parent,
		    int which_button) {
    super(s);
    cur_color = color;
    this.parent = parent;
    this.which_button = which_button;
    setLayout(null);

    /* Set up a small nina-draw-er */
    p.num_colors = 1;
    p.ran_colors = false;
    p.palette[0] = color;
    p.ran_palette = false;
    p.ran_lines = p.ran_a_pulse = p.ran_b_pulse = false;
    p.num_lines = 38;
    p.a_pulse = 27;
    p.b_pulse = 22;
    p.show_lines = false;
    p.setup();

    lpanel = new Panel();
    lpanel.setLayout(new GridLayout(1, 1));
    lpanel.resize(190, 190);
    lpanel.add(nina);
    add(lpanel);
    lpanel.move(10, 50);

    rpanel = new Panel();
    rpanel.resize(300, 150);
    rpanel.setLayout(new GridLayout(5, 1));
    rpanel.add(hue = new ColorFrameRow("Hue", 1, 360, this));
    rpanel.add(sat = new ColorFrameRow("Saturation", 0, 100, this));
    rpanel.add(bright = new ColorFrameRow("Brightness", 0, 100, this));
    rpanel.add(new Panel()); /* Just a spacer */
    rpanel.add(btn_panel = new Panel());
    btn_panel.setFont(new Font("Helvetica", Font.BOLD, 14));
    btn_panel.add(ok = new Button("Ok"));
    btn_panel.add(cancel = new Button("Cancel"));
    add(rpanel);
    rpanel.move(190, 75);
    resize(500, 250);
    show();
    nina.drawFig(p);
    
    /* Initialize the HSB displays */
    HSB = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), 
			 (new float[3]));
    hue.setVal((int)(HSB[0] * 360));
    sat.setVal((int)(HSB[1] * 100));
    bright.setVal((int)(HSB[2] * 100));
  }

  /* Called from row-controllers when something changed */
  void do_update() {
    cur_color = 
      Color.getHSBColor((hue.getVal() == 360 ? 359 : hue.getVal()) / 360f,
			sat.getVal() / 100f,
			bright.getVal() / 100f);
    p.palette[0] = cur_color;
    nina.drawFig(p);
  }

  public boolean action(Event e, Object arg) {
    if (e.target instanceof Button) {
      if (e.target == ok)
	parent.set_color(cur_color, which_button);

      nina.die();
      nina = null;
      hide();
      dispose();
      return(true);
    }
    return(false);
  }
  /* Make hitting return act like Ok button */
  public boolean handleEvent(Event e) {
    if (e.id == e.KEY_RELEASE)
      if (e.key == '\n') {
	e.target = ok;
	return(action(e, e));
      }
    return(super.handleEvent(e));
  }
}

/* A row in the color frame, contains a label, scrollbar, and
   value */
class ColorFrameRow extends Panel {
  WideScroll scroll;
  TextField text;
  WideLabel name;
  String prev_text;
  int max, val;
  ColorFrame creator;

  ColorFrameRow(String label, int min, int max, ColorFrame creator) {
    this.max = max;
    this.creator = creator;
    add(name = new WideLabel(label, Label.RIGHT));
    name.resize(30, 10);
    scroll = new WideScroll(Scrollbar.HORIZONTAL, 1, 10, min, max);
    add(scroll);
    add(text = new TextField(String.valueOf(max)));
  }
  
  public void setVal(int val) {
    scroll.setValue(val);
    text.setText(String.valueOf(val));
    this.val = val;
  }

  public int getVal() {
    return(val);
  }

  public boolean handleEvent(Event e) {
    int new_val;
    String new_text;

    if (e.target == scroll) {
      val = scroll.getValue();
      text.setText(String.valueOf(val));
      creator.do_update();
      return(false);
    }
    /* Handle typing into text */
    if (e.target == text) {
      if (e.id == e.KEY_PRESS) {
	prev_text = text.getText();
	return(false);
      }
      if (e.id == e.KEY_RELEASE) {
	new_text = text.getText();
	try { new_val = Integer.parseInt(new_text); }
	catch (NumberFormatException err) {
	  /* We must allow empty strings for backspace case */
	  if (new_text.length() > 0)
	    text.setText(prev_text);
	  return(false);
	}
	if (new_val > max) {
	  text.setText(prev_text);
	  return(false);
	}
	/* New value checks out ok, so make scrollbar match */
	val = new_val;
	scroll.setValue(val);
	creator.do_update();
	return(false);
      }
    }
    return(false);
  }
}

/* A scrollbar subclass that has a reasonable width. Need this because
   I can not get Scrollbar.resize to work */
class WideScroll extends Scrollbar {
  WideScroll(int a, int b, int c, int d, int e) {
    super(a, b, c, d, e);
  }

  public Dimension preferredSize() {
    return(new Dimension(150, 20));
  }
}

/* A Label subclass that has a reasonable width. Need this because
   I can not get Label.resize to work either */
class WideLabel extends Label {
  WideLabel(String label, int align) {
    super(label, align);
  }

  public Dimension preferredSize() {
    return(new Dimension(75, 20));
  }
}