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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "chrome/browser/ui/cocoa/hover_close_button.h"
#include "base/memory/scoped_nsobject.h"
#include "grit/generated_resources.h"
#import "third_party/molokocacao/NSBezierPath+MCAdditions.h"
#include "ui/base/l10n/l10n_util.h"
namespace {
const CGFloat kCircleRadius = 0.415 * 16;
const CGFloat kCircleHoverWhite = 0.565;
const CGFloat kCircleClickWhite = 0.396;
const CGFloat kXShadowAlpha = 0.75;
const CGFloat kXShadowCircleAlpha = 0.1;
} // namespace
@interface HoverCloseButton(Private)
- (void)updatePaths;
- (void)setUpDrawingPaths;
@end
@implementation HoverCloseButton
- (id)initWithFrame:(NSRect)frameRect {
if ((self = [super initWithFrame:frameRect])) {
[self commonInit];
}
return self;
}
- (void)awakeFromNib {
[super awakeFromNib];
[self commonInit];
}
- (void)drawRect:(NSRect)rect {
if (!circlePath_.get() || !xPath_.get())
[self setUpDrawingPaths];
// Only call updatePaths if the size changed.
if (!NSEqualSizes(oldSize_, [self bounds].size))
[self updatePaths];
// If the user is hovering over the button, a light/dark gray circle is drawn
// behind the 'x'.
if (hoverState_ != kHoverStateNone) {
// Adjust the darkness of the circle depending on whether it is being
// clicked.
CGFloat white = (hoverState_ == kHoverStateMouseOver) ?
kCircleHoverWhite : kCircleClickWhite;
[[NSColor colorWithCalibratedWhite:white alpha:1.0] set];
[circlePath_ fill];
}
[[NSColor whiteColor] set];
[xPath_ fill];
// Give the 'x' an inner shadow for depth. If the button is in a hover state
// (circle behind it), then adjust the shadow accordingly (not as harsh).
NSShadow* shadow = [[[NSShadow alloc] init] autorelease];
CGFloat alpha = (hoverState_ != kHoverStateNone) ?
kXShadowCircleAlpha : kXShadowAlpha;
[shadow setShadowColor:[NSColor colorWithCalibratedWhite:0.15
alpha:alpha]];
[shadow setShadowOffset:NSMakeSize(0.0, 0.0)];
[shadow setShadowBlurRadius:2.5];
[xPath_ fillWithInnerShadow:shadow];
}
- (void)commonInit {
// Set accessibility description.
NSString* description = l10n_util::GetNSStringWithFixup(IDS_ACCNAME_CLOSE);
[[self cell]
accessibilitySetOverrideValue:description
forAttribute:NSAccessibilityDescriptionAttribute];
// Add a tooltip.
[self setToolTip:l10n_util::GetNSStringWithFixup(IDS_TOOLTIP_CLOSE_TAB)];
}
- (void)setUpDrawingPaths {
// Keep the paths centered around the origin in this function. It is then
// translated in -updatePaths.
NSPoint xCenter = NSZeroPoint;
circlePath_.reset([[NSBezierPath bezierPath] retain]);
[circlePath_ moveToPoint:xCenter];
CGFloat radius = kCircleRadius;
[circlePath_ appendBezierPathWithArcWithCenter:xCenter
radius:radius
startAngle:0.0
endAngle:365.0];
// Construct an 'x' by drawing two intersecting rectangles in the shape of a
// cross and then rotating the path by 45 degrees.
xPath_.reset([[NSBezierPath bezierPath] retain]);
[xPath_ appendBezierPathWithRect:NSMakeRect(3.5, 7.0, 9.0, 2.0)];
[xPath_ appendBezierPathWithRect:NSMakeRect(7.0, 3.5, 2.0, 9.0)];
NSRect pathBounds = [xPath_ bounds];
NSPoint pathCenter = NSMakePoint(NSMidX(pathBounds), NSMidY(pathBounds));
NSAffineTransform* transform = [NSAffineTransform transform];
[transform translateXBy:xCenter.x yBy:xCenter.y];
[transform rotateByDegrees:45.0];
[transform translateXBy:-pathCenter.x yBy:-pathCenter.y];
[xPath_ transformUsingAffineTransform:transform];
}
- (void)updatePaths {
oldSize_ = [self bounds].size;
// Revert the current transform for the two points.
if (transform_.get()) {
[transform_.get() invert];
[circlePath_.get() transformUsingAffineTransform:transform_.get()];
[xPath_.get() transformUsingAffineTransform:transform_.get()];
}
// Create the new transform. [self bounds] is prefered in case aRect wasn't
// literally taken as bounds (e.g. cropped).
NSPoint xCenter = NSMakePoint(8, oldSize_.height / 2.0f);
// Retain here, as scoped_* don't retain.
transform_.reset([[NSAffineTransform transform] retain]);
[transform_.get() translateXBy:xCenter.x yBy:xCenter.y];
[circlePath_.get() transformUsingAffineTransform:transform_.get()];
[xPath_.get() transformUsingAffineTransform:transform_.get()];
}
@end
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