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// GTMFadeTruncatingTextFieldCell.m
//
// Copyright 2009 Google Inc.
//
// 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 "GTMFadeTruncatingTextFieldCell.h"
#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
@implementation GTMFadeTruncatingTextFieldCell
- (void)awakeFromNib {
// Force to clipping
[self setLineBreakMode:NSLineBreakByClipping];
}
- (id)initTextCell:(NSString *)aString {
self = [super initTextCell:aString];
if (self) {
// Force to clipping
[self setLineBreakMode:NSLineBreakByClipping];
}
return self;
}
- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
NSSize size = [[self attributedStringValue] size];
// Don't complicate drawing unless we need to clip
if (size.width <= NSWidth(cellFrame)) {
[super drawInteriorWithFrame:cellFrame inView:controlView];
return;
}
// Gradient is about twice our line height long
CGFloat gradientWidth = MIN(size.height * 2, NSWidth(cellFrame) / 4);
NSRect solidPart, gradientPart;
NSDivideRect(cellFrame, &gradientPart, &solidPart, gradientWidth, NSMaxXEdge);
// Draw non-gradient part without transparency layer, as light text on a dark
// background looks bad with a gradient layer.
[[NSGraphicsContext currentContext] saveGraphicsState];
[NSBezierPath clipRect:solidPart];
[super drawInteriorWithFrame:cellFrame inView:controlView];
[[NSGraphicsContext currentContext] restoreGraphicsState];
// Draw the gradient part with a transparency layer. This makes the text look
// suboptimal, but since it fades out, that's ok.
[[NSGraphicsContext currentContext] saveGraphicsState];
[NSBezierPath clipRect:gradientPart];
CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
CGContextBeginTransparencyLayerWithRect(context,
NSRectToCGRect(gradientPart), 0);
[super drawInteriorWithFrame:cellFrame inView:controlView];
// TODO(alcor): switch this to GTMLinearRGBShading if we ever need on 10.4
NSColor *color = [self textColor];
NSColor *alphaColor = [color colorWithAlphaComponent:0.0];
NSGradient *mask = [[NSGradient alloc] initWithStartingColor:color
endingColor:alphaColor];
// Draw the gradient mask
CGContextSetBlendMode(context, kCGBlendModeDestinationIn);
[mask drawFromPoint:NSMakePoint(NSMaxX(cellFrame) - gradientWidth,
NSMinY(cellFrame))
toPoint:NSMakePoint(NSMaxX(cellFrame),
NSMinY(cellFrame))
options:NSGradientDrawsBeforeStartingLocation];
[mask release];
CGContextEndTransparencyLayer(context);
[[NSGraphicsContext currentContext] restoreGraphicsState];
}
@end
#endif
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