MFLogViewerTableCell.m

//
//  MFLogViewerTableCell.m
//  MacFusion2
//
//  Created by Michael Gorbach on 3/24/08.
//  Copyright 2008 Michael Gorbach. All rights reserved.
//
// 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.

#import "MFLogViewerTableCell.h"
#import "MFLogReader.h"
#import <math.h>
#import "MFLogging.h"
#import "MFClient.h"


#define Y_PADDING = 5.0;

@interface MFLogViewerTableCell(PrivateAPI)
- (NSDictionary *)textAttributesWithControlView:(NSView *)view;
- (NSDictionary *)headerAttributesWithControlView:(NSView *)controlView;

- (NSAttributedString *)headerForMessage:(NSDictionary *)messageDict controlView:(NSView *)controlView;
- (NSAttributedString *)textForMessage:(NSDictionary *)messageDict controlView:(NSView *)controlView;
@end

@implementation MFLogViewerTableCell
- (id)init {
	if (self = [super init]) {
		[NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehavior10_4];
		_formatter = [NSDateFormatter new];
		[_formatter  setDateStyle:NSDateFormatterShortStyle];
		[_formatter setTimeStyle:NSDateFormatterShortStyle];
		_heightCache = [NSMapTable mapTableWithStrongToStrongObjects];
	}
	
	return self;
}

- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
	if (![controlView inLiveResize]) {
		NSDictionary *messageDict = [self representedObject];
		NSAttributedString *headerText = [self headerForMessage:messageDict controlView:controlView];
		NSAttributedString *messageText = [self textForMessage:messageDict controlView: controlView];
		[headerText drawAtPoint:NSMakePoint(cellFrame.origin.x, cellFrame.origin.y)];
		NSRect messageRect = NSMakeRect(cellFrame.origin.x, cellFrame.origin.y + [headerText size].height, 
										cellFrame.size.width, cellFrame.size.height - [headerText size].height);
		[messageText drawWithRect:messageRect options:NSStringDrawingUsesLineFragmentOrigin];
	}
}

- (NSAttributedString *)headerForMessage:(NSDictionary *)messageDict controlView:(NSView *)controlView {
	NSString *header = headerStringForASLMessageDict(messageDict);
	NSAttributedString *headerAttributed = [[NSAttributedString alloc] initWithString:header attributes:[self headerAttributesWithControlView:controlView]];
	return headerAttributed;
}

- (NSAttributedString *)textForMessage:(NSDictionary *)messageDict controlView:(NSView  *)controlView {
	NSString *message = [messageDict objectForKey:kMFLogKeyMessage];
	NSAttributedString *messageAttributed = [[NSAttributedString alloc] initWithString:message attributes:[self textAttributesWithControlView:controlView]];
	return messageAttributed;
}

- (NSDictionary *)headerAttributesWithControlView:(NSView *)controlView {
	NSDictionary* attributes = [self textAttributesWithControlView:controlView];
	NSMutableDictionary* dict = [NSMutableDictionary dictionaryWithDictionary:attributes];
	[dict setObject:[NSFont boldSystemFontOfSize: 11.0] forKey:NSFontAttributeName];
	return [dict copy];
}

- (NSDictionary *)textAttributesWithControlView:(NSView *)controlView {
	BOOL current = ([[controlView window] firstResponder] == controlView && [[controlView window] isKeyWindow]);
	
	NSMutableParagraphStyle *par = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
	[par setLineBreakMode:NSLineBreakByCharWrapping];
	NSColor* color = current && [self isHighlighted] ? [NSColor whiteColor] : [NSColor blackColor];
	return [NSDictionary dictionaryWithObjectsAndKeys:color, NSForegroundColorAttributeName,
			[NSFont systemFontOfSize:11.0], NSFontAttributeName,[par copy], NSParagraphStyleAttributeName,
			nil];
}

- (CGFloat)heightForCellInWidth:(CGFloat)width {
	NSDictionary *messageDict = [self representedObject];
	NSString *key = [NSString stringWithFormat: @"%d",messageDict];
	if ([_heightCache objectForKey: key]) {
		return [[_heightCache objectForKey: key] floatValue];
	} else {
		NSAttributedString *header = [self headerForMessage:messageDict controlView:[self controlView]];
		
		CGFloat textHeight = 0;
		textHeight += [header size].height;
		
		NSDictionary *attributes = [self textAttributesWithControlView: [self controlView]];
		NSArray *lines = [[messageDict objectForKey: kMFLogKeyMessage] componentsSeparatedByString:@"\n"];
		for (NSString *line in lines) {
			NSSize lineSize = [[line stringByTrimmingCharactersInSet: [NSCharacterSet newlineCharacterSet]] sizeWithAttributes: attributes];
			float numLines = ceilf(lineSize.width / width);
			textHeight += lineSize.height * numLines;
		}
		
		[_heightCache setObject: [NSNumber numberWithFloat: textHeight] forKey: key];
		return textHeight;
	}
}

@end