/*
   NSSliderCell.m

   Copyright (C) 1996 Free Software Foundation, Inc.

   Author: Ovidiu Predescu <ovidiu@net-community.com>
   Date: September 1997
   
   This file is part of the GNUstep GUI Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <Foundation/NSString.h>

#include <AppKit/NSSliderCell.h>
#include <AppKit/NSControl.h>
#include <AppKit/NSImage.h>
#include <AppKit/NSTextFieldCell.h>

#define ASSIGN(a, b) \
  [b retain]; \
  [a release]; \
  a = b;

@implementation NSSliderCell

- init
{
  [self initImageCell:nil];
  _altIncrementValue = -1;
  _isVertical = -1;
  _minValue = 0;
  _maxValue = 1;
  _floatValue = 0;
  [self setBordered:YES];
  [self setBezeled:YES];

  _knobCell = [NSCell new];

  return self;
}

- (void)dealloc
{
  [_titleCell release];
  [_knobCell release];
  [super dealloc];
}

- (void)setFloatValue:(float)aFloat
{
  if (aFloat < _minValue)
    _floatValue = _minValue;
  else if (aFloat > _maxValue)
    _floatValue = _maxValue;
  else
    _floatValue = aFloat;
}

- (void)drawBarInside:(NSRect)aRect flipped:(BOOL)flipped
{
  if ([self image])
    return;

  /* We should now draw the bar. Since this code depends on backend this method
     should be overwritten in backend. */
}

- (NSRect)knobRectFlipped:(BOOL)flipped
{
  NSImage* image = [_knobCell image];
  NSSize size;
  NSPoint origin;
  float floatValue;

  if (_isVertical && flipped)
    _floatValue = _maxValue + _minValue - _floatValue;

  floatValue = (_floatValue - _minValue) / (_maxValue - _minValue);

  size = [image size];

  if (_isVertical) {
    origin.x = 0;
    origin.y = (_trackRect.size.height - size.height) * floatValue;
  }
  else {
    origin.x = (_trackRect.size.width - size.width) * floatValue;
    origin.y = 0;
  }

  return NSMakeRect (origin.x, origin.y, size.width, size.height);  
}

- (void)drawKnob
{
  [self drawKnob:[self knobRectFlipped:[[self controlView] isFlipped]]];
}

- (void)drawKnob:(NSRect)knobRect
{
  [_knobCell drawInteriorWithFrame:knobRect inView:[self controlView]];
}

- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView*)controlView
{
  BOOL vertical = (cellFrame.size.height > cellFrame.size.width);
  NSImage* image;
  NSSize size;

  if (vertical != _isVertical) {
    if (vertical) {
      image = [NSImage imageNamed:@"common_SliderVert"];
      size = [image size];
      [_knobCell setImage:image];
      [image setSize:NSMakeSize (cellFrame.size.width, size.height)];
    }
    else {
      image = [NSImage imageNamed:@"common_SliderHoriz"];
      size = [image size];
      [_knobCell setImage:image];
      [image setSize:NSMakeSize (size.width, cellFrame.size.height)];
    }
  }
  _isVertical = vertical;

  _trackRect = cellFrame;

  if (_titleCell)
    [_titleCell drawInteriorWithFrame:cellFrame inView:controlView];

  [self drawBarInside:cellFrame flipped:[controlView isFlipped]];
  [self drawKnob];
}

- (float)knobThickness
{
  NSImage* image = [_knobCell image];
  NSSize size = [image size];

  return _isVertical ? size.height : size.width;
}

- (void)setKnobThickness:(float)thickness
{
  NSImage* image = [_knobCell image];
  NSSize size = [image size];

  if (_isVertical)
    size.height = thickness;
  else
    size.width = thickness;

  [image setSize:size];
}

- (void)setAltIncrementValue:(double)increment
{
  _altIncrementValue = increment;
}

- (void)setMinValue:(double)aDouble
{
  _minValue = aDouble;
  if (_floatValue < _minValue)
    _floatValue = _minValue;
}

- (void)setMaxValue:(double)aDouble
{
  _maxValue = aDouble;
  if (_floatValue > _maxValue)
    _floatValue = _maxValue;
}

- (id)titleCell				{ return _titleCell; }
- (NSColor*)titleColor			{ return [_titleCell textColor]; }
- (NSFont*)titleFont			{ return [_titleCell font]; }
- (void)setTitle:(NSString*)title	{ [_titleCell setStringValue:title]; }
- (NSString*)title			{ return [_titleCell stringValue]; }
- (void)setTitleCell:(NSCell*)aCell	{ ASSIGN(_titleCell, aCell); }
- (void)setTitleColor:(NSColor*)color	{ [_titleCell setTextColor:color]; }
- (void)setTitleFont:(NSFont*)font	{ [_titleCell setFont:font]; }
- (int)isVertical			{ return _isVertical; }
- (double)altIncrementValue		{ return _altIncrementValue; }
+ (BOOL)prefersTrackingUntilMouseUp	{ return YES; }
- (NSRect)trackRect			{ return _trackRect; }
- (double)minValue			{ return _minValue; }
- (double)maxValue			{ return _maxValue; }
- (float)floatValue			{ return _floatValue; }

- (id)initWithCoder:(NSCoder*)decoder
{
  self = [super initWithCoder:decoder];
  [decoder decodeValuesOfObjCTypes:"ffff",
	      &_minValue, &_maxValue, &_floatValue, &_altIncrementValue];
  return self;
}

- (void)encodeWithCoder:(NSCoder*)coder
{
  [coder encodeValuesOfObjCTypes:"ffff",
	      _minValue, _maxValue, _floatValue, _altIncrementValue];
}

@end