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/*

 *  R.app : a Cocoa front end to: "R A Computer Language for Statistical Data Analysis"

 *  

 *  R.app Copyright notes:

 *                     Copyright (C) 2004-5  The R Foundation

 *                     written by Stefano M. Iacus and Simon Urbanek

 *

 *                  

 *  R Copyright notes:

 *                     Copyright (C) 1995-1996   Robert Gentleman and Ross Ihaka

 *                     Copyright (C) 1998-2001   The R Development Core Team

 *                     Copyright (C) 2002-2004   The R Foundation

 *

 *  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 2 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.

 *

 *  A copy of the GNU General Public License is available via WWW at

 *  http://www.gnu.org/copyleft/gpl.html.  You can also obtain it by

 *  writing to the Free Software Foundation, Inc., 59 Temple Place,

 *  Suite 330, Boston, MA  02111-1307  USA.

 *

 *  Added by Rob Goedman on 2/3/05 based on an example by

 *  Carl Sziebert on Thu May 13 2004

 *  inspired by LineNumbering example authored by Koen van der Drift.

 */

#import "RRulerView.h"

#import "RGUI.h"

@interface RRulerView (PrivateMethods)

- (void)drawEmptyMargin:(NSRect)aRect;

- (void)drawNumbersInMargin:(NSRect)aRect;

- (void)drawOneNumberInMargin:(unsigned) aNumber inRect:(NSRect)r;

@end

@implementation RRulerView

- (id)initWithScrollView:(NSScrollView *)aScrollView orientation:(NSRulerOrientation)orientation showLineNumbers:(BOOL) use textView:(NSTextView *) tv {

	SLog(@"RRulerView.initWithScrollView setting up line No ruler");

	showLineNos = use;

    if (self = [super initWithScrollView: aScrollView orientation: orientation]) 

    {

        unsigned textViewFontSize = [[tv font] pointSize];

        if (textViewFontSize <= 10.0) {

            fontSize = 8.0;

        } else {

            fontSize = 9.0;

        }

		[self updatePreferences];

		[[Preferences sharedPreferences] addDependent:self];

        marginAttributes = [[NSMutableDictionary alloc] init];

        [marginAttributes setObject:[NSFont boldSystemFontOfSize: fontSize] forKey: NSFontAttributeName];

        [marginAttributes setObject:[NSColor disabledControlTextColor] forKey: NSForegroundColorAttributeName];

        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

        [paragraphStyle setAlignment: NSRightTextAlignment];

        [marginAttributes setObject:[[paragraphStyle copy] autorelease] forKey: NSParagraphStyleAttributeName];

        NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];

        [nc addObserver:self selector:@selector(windowDidUpdate:) name: NSWindowDidUpdateNotification object: myTextView];

    }

	myTextView = tv;

	SLog(@" - line No ruler is done");

    return self;

}

- (void)dealloc

{

	[[Preferences sharedPreferences] removeDependent:self];

    [[NSNotificationCenter defaultCenter] removeObserver: self];

    [marginAttributes release];

    [super dealloc];

}

 - (void)windowDidUpdate:(NSNotification *)notification

{

    if (showLineNos && (myTextView == [[[NSDocumentController sharedDocumentController] currentDocument] textView]))

		[self updateView];		

}

- (void)updateView

{

	[self setNeedsDisplay: YES];

}

// Ruler callback to actually draw

- (void)drawHashMarksAndLabelsInRect:(NSRect)aRect

{

	[self drawEmptyMargin: aRect];        

	[self drawNumbersInMargin: aRect];

}

-(void)drawEmptyMargin:(NSRect)aRect

{

    [self setRuleThickness: gutterThickness];

    [[NSColor controlHighlightColor] set];

    [NSBezierPath fillRect: aRect]; 

    NSPoint top = NSMakePoint(aRect.size.width, [self bounds].size.height);

    NSPoint bottom = NSMakePoint(aRect.size.width, 0);

    [[NSColor controlShadowColor] set];

    [NSBezierPath setDefaultLineWidth: 1.0];

    [NSBezierPath strokeLineFromPoint:top toPoint:bottom];

}

-(void)drawNumbersInMargin:(NSRect)aRect

{

    unsigned		index, numberOfLines, numberOfGlyphs, rLineNumber;

    NSRange		lineRange;

    NSLayoutManager	*lm;

    NSRect              docRect, lineRect, numRect;

	BOOL displayNextLineNumber;

    //SLog(@"RRulerView.drawNumbersInMargin: %f:%f %f:%f", aRect.origin.x, aRect.origin.y, aRect.size.width, aRect.size.height);

    docRect = [[self scrollView] documentVisibleRect];

    id textView = [[[NSDocumentController sharedDocumentController] currentDocument] textView];

    lm = [textView layoutManager];    

    numberOfGlyphs = [lm numberOfGlyphs];

	NSTextStorage *ts = [textView textStorage];

	NSString *s = [ts string];

	unichar c;

	displayNextLineNumber = YES;

    for ( rLineNumber = 1, numberOfLines = 1, index = 0; index < numberOfGlyphs; numberOfLines++ )

    {

        lineRect = [lm lineFragmentRectForGlyphAtIndex:index effectiveRange:&lineRange];

		// This offsets the margin of our rulerView so that it scrolls with the textView properly.

		lineRect = NSOffsetRect(lineRect, -docRect.origin.x, -docRect.origin.y);

		numRect = NSMakeRect(aRect.origin.x, lineRect.origin.y, aRect.size.width, lineRect.size.height);

		index = NSMaxRange( lineRange );

		//SLog(@" - draw rect %f:%f %f:%f", numRect.origin.x, numRect.origin.y, numRect.size.width, numRect.size.height);

		c = [s characterAtIndex:lineRange.location + lineRange.length - 1];

		{

			BOOL drawIt = lineRect.origin.y+lineRect.size.height>=aRect.origin.y && lineRect.origin.y<=aRect.origin.y+aRect.size.height;

			if (displayNextLineNumber) {

				if (drawIt) [self drawOneNumberInMargin: rLineNumber inRect: numRect];

				rLineNumber++;

				if (!(c=='\n')) {

					displayNextLineNumber = NO;	

				} 

			} else {

				if (drawIt) [self drawOneNumberInMargin: 0 inRect: numRect];

				if (c=='\n') {

					displayNextLineNumber = YES;			

				} else {

					displayNextLineNumber = NO;

				}			

			}

		}

    }

    lineRect = [lm extraLineFragmentRect];

	// This offsets the margin of our rulerView so that it scrolls with the textView properly.

    lineRect = NSOffsetRect(lineRect, -docRect.origin.x, -docRect.origin.y);

    numRect = NSMakeRect(aRect.origin.x, lineRect.origin.y, aRect.size.width, lineRect.size.height);

	if (lineRect.origin.y+lineRect.size.height>=aRect.origin.y && lineRect.origin.y<=aRect.origin.y+aRect.size.height)

		[self drawOneNumberInMargin: rLineNumber inRect: numRect];

	//SLog(@" - done drawing numbers");

}

-(void)drawOneNumberInMargin:(unsigned) aNumber inRect:(NSRect)r

{

    NSString    *s;

    NSSize      stringSize;

    if (aNumber == 0)

		s = [NSString stringWithFormat:@"."];

	else

		s = [NSString stringWithFormat:@"%d", aNumber, nil];

    stringSize = [s sizeWithAttributes:marginAttributes];

    [s drawInRect: NSMakeRect(r.origin.x, r.origin.y + ((r.size.height / 2) - (stringSize.height / 2)), [self ruleThickness] - 2, r.size.height) withAttributes: marginAttributes];

}

- (void) updatePreferences {

	gutterThickness = [[Preferences stringForKey:lineNumberGutterWidthKey withDefault: @"16.0"] floatValue];

}

@end