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// Copyright (c) 2010 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/cocoa/hover_close_button.h"
#include "app/l10n_util.h"
#include "base/scoped_nsobject.h"
#import "chrome/browser/cocoa/third_party/NSBezierPath+MCAdditions.h"
#include "grit/generated_resources.h"
namespace {
// Convenience function to return the middle point of the given |rect|.
static NSPoint MidRect(NSRect rect) {
return NSMakePoint(NSMidX(rect), NSMidY(rect));
}
const CGFloat kCircleRadiusPercentage = 0.45;
const CGFloat kCircleHoverWhite = 0.565;
const CGFloat kCircleClickWhite = 0.396;
const CGFloat kXShadowAlpha = 0.6;
const CGFloat kXShadowCircleAlpha = 0.1;
} // namespace
@interface HoverCloseButton(Private)
- (void)setUpDrawingPaths;
@end
@implementation HoverCloseButton
- (id)initWithFrame:(NSRect)frameRect {
if ((self = [super initWithFrame:frameRect])) {
[self commonInit];
}
return self;
}
- (void)awakeFromNib {
[self commonInit];
}
- (void)drawRect:(NSRect)rect {
if (!circlePath_.get() || !xPath_.get())
[self setUpDrawingPaths];
// 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];
CGFloat alpha = (hoverState_ != kHoverStateNone) ?
kXShadowCircleAlpha : kXShadowAlpha;
[shadow setShadowColor:[NSColor colorWithCalibratedWhite:0.0
alpha:alpha]];
[shadow setShadowOffset:NSMakeSize(0.0, -1.0)];
[shadow setShadowBlurRadius:2.0];
[xPath_ fillWithInnerShadow:shadow];
}
- (void)commonInit {
[self setTrackingEnabled:YES];
hoverState_ = kHoverStateNone;
[self updateTrackingAreas];
// Set accessibility description.
NSString* description = l10n_util::GetNSStringWithFixup(IDS_ACCNAME_CLOSE);
[[self cell]
accessibilitySetOverrideValue:description
forAttribute:NSAccessibilityDescriptionAttribute];
}
- (void)setUpDrawingPaths {
NSPoint viewCenter = MidRect([self bounds]);
circlePath_.reset([[NSBezierPath bezierPath] retain]);
[circlePath_ moveToPoint:viewCenter];
CGFloat radius = kCircleRadiusPercentage * NSWidth([self bounds]);
[circlePath_ appendBezierPathWithArcWithCenter:viewCenter
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)];
NSPoint pathCenter = MidRect([xPath_ bounds]);
NSAffineTransform* transform = [NSAffineTransform transform];
[transform translateXBy:viewCenter.x yBy:viewCenter.y];
[transform rotateByDegrees:45.0];
[transform translateXBy:-pathCenter.x yBy:-pathCenter.y];
[xPath_ transformUsingAffineTransform:transform];
}
- (void)dealloc {
[self setTrackingEnabled:NO];
[super dealloc];
}
- (void)mouseEntered:(NSEvent*)theEvent {
hoverState_ = kHoverStateMouseOver;
[self setNeedsDisplay:YES];
}
- (void)mouseExited:(NSEvent*)theEvent {
hoverState_ = kHoverStateNone;
[self setNeedsDisplay:YES];
}
- (void)mouseDown:(NSEvent*)theEvent {
hoverState_ = kHoverStateMouseDown;
[self setNeedsDisplay:YES];
// The hover button needs to hold onto itself here for a bit. Otherwise,
// it can be freed while |super mouseDown:| is in it's loop, and the
// |checkImageState| call will crash.
// http://crbug.com/28220
scoped_nsobject<HoverCloseButton> myself([self retain]);
[super mouseDown:theEvent];
// We need to check the image state after the mouseDown event loop finishes.
// It's possible that we won't get a mouseExited event if the button was
// moved under the mouse during tab resize, instead of the mouse moving over
// the button.
// http://crbug.com/31279
[self checkImageState];
}
- (void)setTrackingEnabled:(BOOL)enabled {
if (enabled) {
closeTrackingArea_.reset(
[[NSTrackingArea alloc] initWithRect:[self bounds]
options:NSTrackingMouseEnteredAndExited |
NSTrackingActiveAlways
owner:self
userInfo:nil]);
[self addTrackingArea:closeTrackingArea_.get()];
// If you have a separate window that overlaps the close button, and you
// move the mouse directly over the close button without entering another
// part of the tab strip, we don't get any mouseEntered event since the
// tracking area was disabled when we entered.
[self checkImageState];
} else {
if (closeTrackingArea_.get()) {
[self removeTrackingArea:closeTrackingArea_.get()];
closeTrackingArea_.reset(nil);
}
}
}
- (void)updateTrackingAreas {
[super updateTrackingAreas];
[self checkImageState];
}
- (void)checkImageState {
if (!closeTrackingArea_.get())
return;
// Update the close buttons if the tab has moved.
NSPoint mouseLoc = [[self window] mouseLocationOutsideOfEventStream];
mouseLoc = [self convertPoint:mouseLoc fromView:nil];
hoverState_ = NSPointInRect(mouseLoc, [self bounds]) ?
kHoverStateMouseOver : kHoverStateNone;
[self setNeedsDisplay:YES];
}
@end
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