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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<!-- BEGIN META TAG INFO -->
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="home" href="http://developer.apple.com/">
<link rel="find" href="http://developer.apple.com/search/">
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<script language="JavaScript" src="../../documentation/js/adc.js" type="text/javascript"></script>
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<!-- BEGIN TITLE -->
<title>PhotoSearch - /DateCell.m</title>
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</script>
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<body>
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<!-- START CENTER OPEN -->
<center>
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<!-- BEGIN LOGO AND SEARCH -->
<!--#include virtual="/includes/adcnavbar"-->
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<!-- START BREADCRUMB -->
<div id="breadcrumb">
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr>
<td scope="row"><img width="340" height="10" src="images/1dot.gif" alt=""></td>
<td><img width="340" height="10" src="images/1dot.gif" alt=""></td>
</tr>
<tr valign="middle">
<td align="left" colspan="2">
<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/Cocoa/index.html">Cocoa</a> > <a href="../../samplecode/Cocoa/idxUserExperience-date.html">User Experience</a> > <A HREF="javascript:location.replace('index.html');">PhotoSearch</A> >
</td>
</tr>
<tr>
<td colspan="2" scope="row"><img width="680" height="35" src="images/1dot.gif" alt=""></td>
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</div>
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<!-- START MAIN CONTENT -->
<!-- START TITLE GRAPHIC AND INTRO-->
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr align="left" valign="top">
<td><h1><div id="pagehead">PhotoSearch</div></h1></td>
</tr>
</table>
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<tr align="left" valign="top">
<td id="scdetails">
<h2>/DateCell.m</h2>
<form name="scpopupmenu" onSubmit="return false;" method=post>
<p><strong>View Source Code:</strong>
<select name="gotop" onChange="JumpToNewPage();" style="width:340px"><option selected value="ingnore">Select File</option>
<option value="listing1.html">/CaseInsensitivePredicateTemplate.h</option>
<option value="listing2.html">/CaseInsensitivePredicateTemplate.m</option>
<option value="listing3.html">/CellTrackingRect.h</option>
<option value="listing4.html">/DateCell.h</option>
<option value="listing5.html">/DateCell.m</option>
<option value="listing6.html">/GameView.h</option>
<option value="listing7.html">/GameView.m</option>
<option value="listing8.html">/ImagePreviewCell.h</option>
<option value="listing9.html">/ImagePreviewCell.m</option>
<option value="listing10.html">/main.m</option>
<option value="listing11.html">/MainWindowController.h</option>
<option value="listing12.html">/MainWindowController.m</option>
<option value="listing13.html">/MenuController.h</option>
<option value="listing14.html">/MenuController.m</option>
<option value="listing15.html">/ReadMe.txt</option>
<option value="listing16.html">/SearchItem.h</option>
<option value="listing17.html">/SearchItem.m</option>
<option value="listing18.html">/SearchQuery.h</option>
<option value="listing19.html">/SearchQuery.m</option>
<option value="listing20.html">/TrackableOutlineView.h</option>
<option value="listing21.html">/TrackableOutlineView.m</option></select>
</p>
</form>
<p><strong><a href="PhotoSearch.zip">Download Sample</a></strong> (“PhotoSearch.zip”, 4.49M)<BR>
<strong><a href="PhotoSearch.dmg">Download Sample</a></strong> (“PhotoSearch.dmg”, 4.83M)</p>
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<p><strong><a href="#">Download Sample</a></strong> (“filename.sit”, 500K)</p>
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<td scope="row">
<!--googleon: index -->
<pre class="sourcecodebox">/*
File: DateCell.m
Abstract: Provides a cell implementation that automatically truncates
the date shown based on the cell size. It uses NSDateFormatter and
properly respects the user's date settings.
Version: 1.0
Disclaimer: IMPORTANT: This Apple software is supplied to you by
Apple Inc. ("Apple") in consideration of your agreement to the
following terms, and your use, installation, modification or
redistribution of this Apple software constitutes acceptance of these
terms. If you do not agree with these terms, please do not use,
install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc.
may be used to endorse or promote products derived from the Apple
Software without specific prior written permission from Apple. Except
as expressly stated in this notice, no other rights or licenses, express
or implied, are granted by Apple herein, including but not limited to
any patent rights that may be infringed by your derivative works or by
other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2006-2008 Apple Inc. All Rights Reserved.
*/
#import "DateCell.h"
#define EXPANSION_FRAME_SUPPORT 1
@implementation DateCell
+ (void)initialize {
// We want to use the new formatting behavior. This allows the user to change the date settings in the Intl Preferences and have it work in our app.
[NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehavior10_4];
}
- (NSMutableDictionary *)textAttributes {
NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
NSColor *textColor = [self textColor];
if ([self interiorBackgroundStyle] == NSBackgroundStyleDark) {
textColor = [NSColor alternateSelectedControlTextColor];
}
[attributes setObject:textColor forKey:NSForegroundColorAttributeName];
NSFont *font = [self font];
if (font != nil) {
[attributes setObject:font forKey:NSFontAttributeName];
}
NSMutableParagraphStyle *paraStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[paraStyle setAlignment:[self alignment]];
[paraStyle setLineBreakMode:[self lineBreakMode]];
[paraStyle setBaseWritingDirection:[self baseWritingDirection]];
[attributes setObject:paraStyle forKey:NSParagraphStyleAttributeName];
[paraStyle release];
return attributes;
}
- (NSDateFormatter *)timeDateFormatter {
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
[dateFormatter setDateStyle:NSDateFormatterNoStyle];
return dateFormatter;
}
- (NSDateFormatter *)dateFormatterForDetailLevel:(DateCellDetailLevel)detailLevel {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSDateFormatterStyle timeStyle = NSDateFormatterShortStyle;
NSDateFormatterStyle dateStyle;
switch (detailLevel) {
case DateCellDetailFullDateAndTime: dateStyle = NSDateFormatterFullStyle; break;
case DateCellDetailLongDateAndTime: dateStyle = NSDateFormatterLongStyle; break;
case DateCellDetailMediumDateAndTime: dateStyle = NSDateFormatterMediumStyle; break;
case DateCellDetailShortDateAndTime: dateStyle = NSDateFormatterShortStyle; break;
case DateCellDetailShortDate: dateStyle = NSDateFormatterShortStyle; timeStyle = NSDateFormatterNoStyle; break;
case DateCellDetailNumberOfDateFormats: NSAssert(NO, @"shouldn't get called");
}
[dateFormatter setDateStyle:dateStyle];
[dateFormatter setTimeStyle:timeStyle];
return [dateFormatter autorelease];
}
- (CGFloat)widthOfLongestDateStringWithLevel:(DateCellDetailLevel)detailLevel {
CGFloat result = 0;
NSTimeZone *timeZone = [NSTimeZone localTimeZone];
NSDateFormatter *dateFormatter = [self dateFormatterForDetailLevel:detailLevel];
// This code is rather tied to the gregorian date. We pick an arbitrary date, and iterate through each of the days of the week and each of the months to find the longest string for the given detail level. Because a person can customize (via the intl prefs) the string, we need to iterate through each level for each item.
NSInteger weekDayCount = [[dateFormatter weekdaySymbols] count];
if (weekDayCount == 0) weekDayCount= 7;
// Find the longest week day
NSInteger longestWeekDay = 1;
for (NSInteger dayOfWeek = 1; dayOfWeek <= weekDayCount; dayOfWeek++) {
NSDate *date = [NSCalendarDate dateWithYear:2006 month:1 day:dayOfWeek hour:12 minute:12 second:12 timeZone:timeZone];
NSString *str = [dateFormatter stringFromDate:date];
CGFloat length = [str sizeWithAttributes:[self textAttributes]].width;
if (length > result) {
result = length;
longestWeekDay = dayOfWeek;
}
}
NSInteger monthCount = [[dateFormatter monthSymbols] count];
if (monthCount == 0) monthCount = 12;
for (NSInteger month = 1; month <= monthCount; month++) {
NSDate *date = [NSCalendarDate dateWithYear:2006 month:month day:longestWeekDay hour:12 minute:12 second:12 timeZone:timeZone];
NSString *str = [dateFormatter stringFromDate:date];
CGFloat length = [str sizeWithAttributes:[self textAttributes]].width;
result = MAX(result, length);
}
return result;
}
- (NSString *)todayString {
return NSLocalizedString(@"Today", @"Today title string");
}
- (NSString *)yesterdayString {
return NSLocalizedString(@"Yesterday", @"Yesterday title string");
}
static BOOL gCalculatedDetailLevelWidths = NO;
static CGFloat gDetailLevelWidths[DateCellDetailNumberOfDateFormats];
static CGFloat gDetailNaturalWidths[DateCellDetailNumberOfTodayAndYesterdays];
- (void)updateDetailLevelWidths
{
if (gCalculatedDetailLevelWidths) {
return;
}
for (NSInteger i = 0; i < DateCellDetailNumberOfDateFormats; i++) {
gDetailLevelWidths[i] = [self widthOfLongestDateStringWithLevel:i];
}
// Fill out the yesterday/today strings with some sample times.
NSDateFormatter *dateFormatter = [self timeDateFormatter];
NSString *timeSample = [dateFormatter stringFromDate:[NSDate date]];
NSString *todayString = [self todayString];
NSString *yesterdayString = [self yesterdayString];
NSString *yesterdayWithTime = [NSString stringWithFormat:@"%@, %@", yesterdayString, timeSample];
NSString *todayWithTime = [NSString stringWithFormat:@"%@, %@", todayString, timeSample];
gDetailNaturalWidths[DateCellDetailYesterdayAndTime] = [yesterdayWithTime sizeWithAttributes:[self textAttributes]].width;
gDetailNaturalWidths[DateCellDetailYesterday] = [yesterdayString sizeWithAttributes:[self textAttributes]].width;
gDetailNaturalWidths[DateCellDetailTodayAndTime] = [todayWithTime sizeWithAttributes:[self textAttributes]].width;
gDetailNaturalWidths[DateCellDetailToday] = [todayString sizeWithAttributes:[self textAttributes]].width;
gCalculatedDetailLevelWidths = YES;
}
- (void)updateDetailLevel {
[self updateDetailLevelWidths];
// Find something that fits well for our current width..
iDateDetailLevel = DateCellDetailNumberOfDateFormats - 1;
for (DateCellDetailLevel i = 0; i < DateCellDetailNumberOfDateFormats; i++) {
if (gDetailLevelWidths[i] <= iLastWidth) {
iDateDetailLevel = i;
break;
}
}
// Check to see if we can use the yesterday/today option
iTodayAndYesterdayLevel = DateCellDetailNumberOfTodayAndYesterdays;
for (DateCellDetailTodayAndYesterdays i = 0; i < DateCellDetailNumberOfTodayAndYesterdays; i++) {
// If we have one greater than it, then we can't use it
if (gDetailNaturalWidths[i] > iLastWidth) {
break;
} else {
iTodayAndYesterdayLevel = i;
}
}
}
- (NSString *)dateStringToDraw {
NSString *stringToDraw = nil;
NSDate *date = [self objectValue];
// Check to see if we should use today/yesterday
if (iTodayAndYesterdayLevel != DateCellDetailNumberOfTodayAndYesterdays) {
NSCalendarDate *calendarDate = [NSCalendarDate dateWithTimeIntervalSinceReferenceDate:[date timeIntervalSinceReferenceDate]];
NSCalendarDate *todaysDate = [NSCalendarDate calendarDate];
if ([calendarDate yearOfCommonEra] == [todaysDate yearOfCommonEra]) {
if ([calendarDate dayOfYear] == [todaysDate dayOfYear]) {
if (iLastWidth >= gDetailNaturalWidths[DateCellDetailTodayAndTime]) {
stringToDraw = [NSString stringWithFormat:@"%@, %@", [self todayString], [[self timeDateFormatter] stringFromDate:date]];
} else if (iLastWidth >= gDetailNaturalWidths[DateCellDetailToday]) {
stringToDraw = [self todayString];
}
} else if ([calendarDate dayOfYear] == ([todaysDate dayOfYear] - 1)) {
if (iLastWidth >= gDetailNaturalWidths[DateCellDetailYesterdayAndTime]) {
stringToDraw = [NSString stringWithFormat:@"%@, %@", [self yesterdayString], [[self timeDateFormatter] stringFromDate:date]];
} else if (iLastWidth >= gDetailNaturalWidths[DateCellDetailYesterday]) {
stringToDraw = [self yesterdayString];
}
}
}
}
if (stringToDraw == nil) {
stringToDraw = [[self dateFormatterForDetailLevel:iDateDetailLevel] stringFromDate:date];
}
return stringToDraw;
}
- (void)drawInteriorWithFrame:(NSRect)bounds inView:(NSView *)controlView {
if (iLastWidth != NSWidth(bounds)) {
iLastWidth = NSWidth(bounds);
[self updateDetailLevel];
}
bounds = NSInsetRect(bounds, 2, 2);
// First, if we don't have a valid date, then draw "---", like what finder does
if (![[self objectValue] isKindOfClass:[NSDate class]])
{
NSAttributedString *unknownDateString = [[NSMutableAttributedString alloc] initWithString:@"---" attributes:[self textAttributes]];
[unknownDateString drawInRect:bounds];
[unknownDateString release];
return;
}
NSString *stringToDraw = [self dateStringToDraw];
[stringToDraw drawInRect:bounds withAttributes:[self textAttributes]];
}
#if EXPANSION_FRAME_SUPPORT
// Expansion tool tip support
- (NSRect)expansionFrameWithFrame:(NSRect)cellFrame inView:(NSView *)view {
// Always use the "full size" level
iDateDetailLevel = DateCellDetailFullDateAndTime;
iTodayAndYesterdayLevel = DateCellDetailNumberOfTodayAndYesterdays;
iLastWidth = 0; // Force a recalc of the above values when really drawing
NSString *stringToDraw = [self dateStringToDraw];
NSSize stringSize = [stringToDraw sizeWithAttributes:[self textAttributes]];
if (stringSize.width > NSWidth(cellFrame)) {
// It isn't big enough, so return a modified rect that will contain the right size.
cellFrame.size = stringSize;
cellFrame.size.width += 4;
cellFrame.size.height += 4;
} else {
cellFrame = NSZeroRect;
}
return cellFrame;
}
- (void)drawWithExpansionFrame:(NSRect)cellFrame inView:(NSView *)view {
iDateDetailLevel = DateCellDetailFullDateAndTime;
iTodayAndYesterdayLevel = DateCellDetailNumberOfTodayAndYesterdays;
iLastWidth = NSWidth(cellFrame);
[super drawWithExpansionFrame:cellFrame inView:view];
iLastWidth = 0;
}
#endif
@end
</pre>
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