我有一个NSTextView,可以显示一些带有一些格式选项的文本.其中之一是能够为选择或当前行打开/关闭子弹列表(最简单的一个).
我知道在NSTextView上有一个orderFrontListPanel:方法打开窗口,其中包含可供选择和编辑的可用列表参数(例如,当您按Menu-> Format-> List …时在TextView中).
我已经想出并实现了手动添加项目符号,NSTextView似乎几乎正确地使用它们.通过说几乎我的意思是它保留标签位置,继续“输入”列表,等等.但是有一些小故障不适合我,不同于标准实施.
我试图找到以编程方式设置列表的默认方式,就像通过“列表…”菜单完成一样没有运气.
我请求帮助,每一点点的信息都会受到赞赏:).
P.S.:我已经查看了TextView源代码,发现了很多有趣但没有迹象或线索如何以编程方式启用列表.
更新
还在调查.我发现当你发送orderFrontListPanel:到你的NSTextView然后选择项目符号并按回车键时,没有特殊的消息被发送到NSTextView.这意味着可以在弹出式面板中的某处构建项目符号列表,并直接设置为TextView的文本容器…
解决方法
方法1:
以下链接引导我使用第一种方法,但除非您想为子弹使用一些特殊的非Unicode字形,否则它将不必要地转向:
> Display hidden characters in NSTextView
> How to draw one NSGlyph,that hasn’t unicode representation?
> appendBezierPathWithGlyph fails in [NSBezierPath currentPoint]
这需要:(1)子类化布局管理器,用子弹字形替换某些任意字符; (2)带有firstLineHeadIndent的段落样式,比该缩进略大的制表位,以及用于组合两者的包裹线的headIndent.
布局管理器如下所示:
- #import <Foundation/Foundation.h>
- @interface TickerLayoutManager : NSLayoutManager {
- // Might as well let this class hold all the fonts used by the progress ticker.
- // That way they're all defined in one place,the init method.
- NSFont *fontNormal;
- NSFont *fontIndent; // smaller,for indented lines
- NSFont *fontBold;
- NSGlyph glyphBullet;
- CGFloat fWidthGlyPHPlusSpace;
- }
- @property (nonatomic,retain) NSFont *fontNormal;
- @property (nonatomic,retain) NSFont *fontIndent;
- @property (nonatomic,retain) NSFont *fontBold;
- @property NSGlyph glyphBullet;
- @property CGFloat fWidthGlyPHPlusSpace;
- @end
- #import "TickerLayoutManager.h"
- @implementation TickerLayoutManager
- @synthesize fontNormal;
- @synthesize fontIndent;
- @synthesize fontBold;
- @synthesize glyphBullet;
- @synthesize fWidthGlyPHPlusSpace;
- - (id)init {
- self = [super init];
- if (self) {
- self.fontNormal = [NSFont fontWithName:@"Baskerville" size:14.0f];
- self.fontIndent = [NSFont fontWithName:@"Baskerville" size:12.0f];
- self.fontBold = [NSFont fontWithName:@"Baskerville Bold" size:14.0f];
- // Get the bullet glyph.
- self.glyphBullet = [self.fontIndent glyphWithName:@"bullet"];
- // To determine its point size,put it in a Bezier path and take its bounds.
- NSBezierPath *bezierPath = [NSBezierPath bezierPath];
- [bezierPath moveToPoint:NSMakePoint(0.0f,0.0f)]; // prevents "No current point for line" exception
- [bezierPath appendBezierPathWithGlyph:self.glyphBullet inFont:self.fontIndent];
- NSRect rectGlyphOutline = [bezierPath bounds];
- // The bullet should be followed with a space,so get the combined size...
- NSSize sizeSpace = [@" " sizeWithAttributes:[NSDictionary dictionaryWithObject:self.fontIndent forKey:NSFontAttributeName]];
- self.fWidthGlyPHPlusSpace = rectGlyphOutline.size.width + sizeSpace.width;
- // ...which is for some reason inexact. If this number is too low,your bulleted text will be thrown to the line below,so add some boost.
- self.fWidthGlyPHPlusSpace *= 1.5; //
- }
- return self;
- }
- - (void)drawGlyphsForGlyphRange:(NSRange)range
- atPoint:(NSPoint)origin {
- // The following prints only once,even though the textview's string is set 4 times,so this implementation is not too expensive.
- printf("\nCalling TickerLayoutManager's drawGlyphs method.");
- NSString *string = [[self textStorage] string];
- for (int i = range.location; i < range.length; i++) {
- // Replace all occurrences of the ">" char with the bullet glyph.
- if ([string characterAtIndex:i] == '>')
- [self replaceGlyphAtIndex:i withGlyph:self.glyphBullet];
- }
- [super drawGlyphsForGlyphRange:range atPoint:origin];
- }
- @end
将布局管理器分配给窗口/视图控制器的awakeFromNib中的textview,如下所示:
- - (void) awakeFromNib {
- // regular setup...
- // Give the ticker display NSTextView its subclassed layout manager.
- TickerLayoutManager *newLayoutMgr = [[TickerLayoutManager alloc] init];
- NSTextContainer *textContainer = [self.txvProgressTicker textContainer];
- // Use "replaceLM" rather than "setLM," in order to keep shared relnshps intact.
- [textContainer replaceLayoutManager:newLayoutMgr];
- [newLayoutMgr release];
- // (Note: It is possible that all text-displaying controls in this class’s window will share this text container,as they would a field editor (a textview),although the fact that the ticker display is itself a textview might isolate it. Apple's "Text System Overview" is not clear on this point.)
- }
- - (void) addProgressTickerLine:(NSString *)string
- inStyle:(uint8_t)uiStyle {
- // Null check.
- if (!string)
- return;
- // Prepare the font.
- // (As noted above,TickerLayoutManager holds all 3 ticker display fonts.)
- NSFont *font = nil;
- TickerLayoutManager *tickerLayoutMgr = (TickerLayoutManager *)[self.txvProgressTicker layoutManager];
- switch (uiStyle) {
- case kTickerStyleNormal:
- font = tickerLayoutMgr.fontNormal;
- break;
- case kTickerStyleIndent:
- font = tickerLayoutMgr.fontIndent;
- break;
- case kTickerStyleBold:
- font = tickerLayoutMgr.fontBold;
- break;
- default:
- font = tickerLayoutMgr.fontNormal;
- break;
- }
- // Prepare the paragraph style,to govern indentation.
- // CAUTION: If you propertize it for re-use,make sure you don't mutate it once it has been assigned to an attributed string. (See warning in class ref.)
- // At the same time,add the initial line break and,if indented,the tab.
- NSMutableParagraphStyle *paragStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy]; // ALLOC
- [paragStyle setAlignment:NSLeftTextAlignment]; // default,but just in case
- if (uiStyle == kTickerStyleIndent) {
- // (The custom layout mgr will replace ‘>’ char with a bullet,so it should be followed with an extra space.)
- string = [@"\n>\t" stringByAppendingString:string];
- // Indent the first line up to where the bullet should appear.
- [paragStyle setFirstLineHeadIndent:15.0f];
- // Define a tab stop to the right of the bullet glyph.
- NSTextTab *textTabFllwgBullet = [[NSTextTab alloc] initWithType:NSLeftTabStopType location:15.0f + tickerLayoutMgr.fWidthGlyPHPlusSpace];
- [paragStyle setTabStops:[NSArray arrayWithObject:textTabFllwgBullet]];
- [textTabFllwgBullet release];
- // Set the indentation for the wrapped lines to the same place as the tab stop.
- [paragStyle setHeadIndent:15.0f + tickerLayoutMgr.fWidthGlyPHPlusSpace];
- }
- else {
- string = [@"\n" stringByAppendingString:string];
- }
- // PUT IT ALL TOGETHER.
- // Combine the above into a dictionary of attributes.
- NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
- font,NSFontAttributeName,paragStyle,NSParagraphStyleAttributeName,nil];
- // Use the attributes dictionary to make an attributed string out of the plain string.
- NSAttributedString *attrs = [[NSAttributedString alloc] initWithString:string attributes:dict]; // ALLOC
- // Append the attributed string to the ticker display.
- [[self.txvProgressTicker textStorage] appendAttributedString:attrs];
- // RELEASE
- [attrs release];
- [paragStyle release];
- }
测试出来:
- NSString *sTicker = NSLocalizedString(@"First normal line of ticker should wrap to left margin",@"First normal line of ticker should wrap to left margin");
- [self addProgressTickerLine:sTicker inStyle:kTickerStyleNormal];
- sTicker = NSLocalizedString(@"Indented ticker line should have bullet point and should wrap farther to right.",@"Indented ticker line should have bullet point and should wrap farther to right.");
- [self addProgressTickerLine:sTicker inStyle:kTickerStyleIndent];
- sTicker = NSLocalizedString(@"Try a second indented line,to make sure both line up.",@"Try a second indented line,to make sure both line up.");
- [self addProgressTickerLine:sTicker inStyle:kTickerStyleIndent];
- sTicker = NSLocalizedString(@"Final bold line",@"Final bold line");
- [self addProgressTickerLine:sTicker inStyle:kTickerStyleBold];
你得到这个:
方法2:
但子弹是一个常规的Unicode字符,在十六进制2022.所以你可以直接把它放在字符串中,并得到一个精确的测量,如下所示:
- NSString *stringWithGlyph = [NSString stringWithUTF8String:"\u2022"];
- NSString *stringWithGlyPHPlusSpace = [stringWithGlyph stringByAppendingString:@" "];
- NSSize sizeGlyPHPlusSpace = [stringWithGlyPHPlusSpace sizeWithAttributes:[NSDictionary dictionaryWithObject:self.fontIndent forKey:NSFontAttributeName]];
- self.fWidthGlyPHPlusSpace = sizeGlyPHPlusSpace.width;
因此不需要自定义布局管理器.只需像上面一样设置paragStyle缩进,并将文本字符串附加到一个字符串,该字符串包含行返回项目符号空格(或选项卡,在这种情况下,您仍然希望该制表符停止).
使用空格,这产生了更严格的结果:
想要使用子弹以外的角色吗?这是一个很好的Unicode图表:http://www.danshort.com/unicode/