问Cocoa:如何像在Mail.app中一样绘制插图文本？

EN

@implementation DMEmbossedTextFieldCell

#pragma mark NSCell

- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView;
{
    /* This method copies the three-layer method used by Safari's error page. That's accessible by forcing an
     * error (e.g. visiting <foo://>) and opening the web inspector. */

    // I tried to use NSBaselineOffsetAttributeName instead of shifting the frame, but that didn't seem to work
    const NSRect onePixelUpFrame = NSOffsetRect(cellFrame, 0.0, [NSGraphicsContext currentContext].isFlipped ? -1.0 : 1.0);
    const NSRange fullRange = NSMakeRange(0, self.attributedStringValue.length);

    NSMutableAttributedString *scratchString = [self.attributedStringValue mutableCopy];

    BOOL overDark = (self.backgroundStyle == NSBackgroundStyleDark);
    CGFloat (^whenLight)(CGFloat) = ^(CGFloat b) { return overDark ? 1.0 - b : b; };

    // Layer 1
    [scratchString addAttribute:NSForegroundColorAttributeName value:[NSColor colorWithCalibratedWhite:whenLight(1.0) alpha:1.0] range:fullRange];
    [scratchString drawInRect:cellFrame];

    // Layer 2
    BOOL useGradient = NO; // Safari 5.2 preview has switched to a lighter, solid color look for the detail text. Since we use the same class, use bold-ness to decide
    if (self.attributedStringValue.length > 0) {
        NSFont *font = [self.attributedStringValue attribute:NSFontAttributeName atIndex:0 effectiveRange:NULL];
        if ([[NSFontManager sharedFontManager] traitsOfFont:font] & NSBoldFontMask)
            useGradient = YES;
    }

    NSColor *solidShade = [NSColor colorWithCalibratedHue:200/360.0 saturation:0.03 brightness:whenLight(0.41) alpha:1.0];
    [scratchString addAttribute:NSForegroundColorAttributeName value:solidShade range:fullRange];
    [scratchString drawInRect:onePixelUpFrame];

    // Layer 3 (Safari uses alpha of 0.25)
    [scratchString addAttribute:NSForegroundColorAttributeName value:[NSColor colorWithCalibratedWhite:whenLight(1.0) alpha:0.25] range:fullRange];
    [scratchString drawInRect:cellFrame];
}

@end

// InnerShadowTextFieldCell.h
#import <Cocoa/Cocoa.h>
@interface InnerShadowTextFieldCell : NSTextFieldCell
@property (strong) NSShadow *innerShadow;
@end

// InnerShadowTextFieldCell.m
#import "InnerShadowTextFieldCell.h"
// This class needs the NSString category -bezierWithFont: from,
// https://developer.apple.com/library/mac/samplecode/SpeedometerView/Listings/SpeedyCategories_m.html

@implementation InnerShadowTextFieldCell


- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {

    //// Shadow Declarations
    if (_innerShadow == nil) {
        /* Inner shadow has not been set, override here with default shadow.
           You may or may not want this behaviour. */
        _innerShadow = [[NSShadow alloc] init];
        [_innerShadow setShadowColor: [NSColor darkGrayColor]];
        [_innerShadow setShadowOffset: NSMakeSize(0.1, 0.1)];
        /* Trying to find a default shadow radius which will look good for
           a label of any size, let's get a rough estimate based on the
           hypotenuse of the cell frame. */
        [_innerShadow setShadowBlurRadius: 0.0075 * hypot(NSWidth(cellFrame), NSHeight(cellFrame)) ];
    }

    /* Because we are using the -bezierWithFont: we get a slightly 
       different path than had we used the superclass to drawn the 
       text path. This means that the background colour and text 
       colour looks odd if we use call the superclass's,
            -drawInteriorWithFrame:inView: method let's do that 
       drawing here. Not making the call to super might cause 
       problems for general use (?) but for a simple label is seems 
       to work OK */
    [self.backgroundColor setFill];
    NSRectFill(cellFrame);

    NSBezierPath *bezierPath = [self.title bezierWithFont:self.font];
    [self.textColor setFill];
    [bezierPath fill];


    /* The following is inner shadow drawing method is taken from Paint Code */

    ////// Bezier Inner Shadow
    NSShadow *shadow = _innerShadow;
    NSRect bezierBorderRect = NSInsetRect([bezierPath bounds], -shadow.shadowBlurRadius, -shadow.shadowBlurRadius);
    bezierBorderRect = NSOffsetRect(bezierBorderRect, -shadow.shadowOffset.width, shadow.shadowOffset.height);
    bezierBorderRect = NSInsetRect(NSUnionRect(bezierBorderRect, [bezierPath bounds]), -1, -1);

    NSBezierPath* bezierNegativePath = [NSBezierPath bezierPathWithRect: bezierBorderRect];
    [bezierNegativePath appendBezierPath: bezierPath];
    [bezierNegativePath setWindingRule: NSEvenOddWindingRule];

    [NSGraphicsContext saveGraphicsState];
    {
        NSShadow* shadowWithOffset = [shadow copy];
        CGFloat xOffset = shadowWithOffset.shadowOffset.width + round(bezierBorderRect.size.width);
        CGFloat yOffset = shadowWithOffset.shadowOffset.height;
        shadowWithOffset.shadowOffset = NSMakeSize(xOffset + copysign(0.0, xOffset), yOffset + copysign(0.1, yOffset));
        [shadowWithOffset set];
        [[NSColor grayColor] setFill];
        [bezierPath addClip];
        NSAffineTransform* transform = [NSAffineTransform transform];
        [transform translateXBy: -round(bezierBorderRect.size.width) yBy: 0];
        [[transform transformBezierPath: bezierNegativePath] fill];
    }
    [NSGraphicsContext restoreGraphicsState];


}
@end