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// Copyright (c) 2012 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/history_overlay_controller.h"
#include "base/logging.h"
#import "chrome/browser/ui/cocoa/browser_window_controller.h"
#include "grit/theme_resources.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/image/image.h"
#import <QuartzCore/QuartzCore.h>
#include <cmath>
// Constants ///////////////////////////////////////////////////////////////////
// The radius of the circle drawn in the shield.
const CGFloat kShieldRadius = 70;
// The diameter of the circle and the width of its bounding box.
const CGFloat kShieldWidth = kShieldRadius * 2;
// The height of the shield.
const CGFloat kShieldHeight = 140;
// Additional height that is added to kShieldHeight when the gesture is
// considered complete.
const CGFloat kShieldHeightCompletionAdjust = 10;
// HistoryOverlayView //////////////////////////////////////////////////////////
// The content view that draws the semicircle and the arrow.
@interface HistoryOverlayView : NSView {
@private
HistoryOverlayMode mode_;
CGFloat shieldAlpha_;
}
@property(nonatomic) CGFloat shieldAlpha;
- (id)initWithMode:(HistoryOverlayMode)mode
image:(NSImage*)image;
@end
@implementation HistoryOverlayView
@synthesize shieldAlpha = shieldAlpha_;
- (id)initWithMode:(HistoryOverlayMode)mode
image:(NSImage*)image {
NSRect frame = NSMakeRect(0, 0, kShieldWidth, kShieldHeight);
if ((self = [super initWithFrame:frame])) {
mode_ = mode;
// If going backward, the arrow needs to be in the right half of the circle,
// so offset the X position.
CGFloat offset = mode_ == kHistoryOverlayModeBack ? kShieldRadius : 0;
NSRect arrowRect = NSMakeRect(offset, 0, kShieldRadius, kShieldHeight);
arrowRect = NSInsetRect(arrowRect, 10, 0); // Give a little padding.
base::scoped_nsobject<NSImageView> imageView(
[[NSImageView alloc] initWithFrame:arrowRect]);
[imageView setImage:image];
[imageView setAutoresizingMask:NSViewMinYMargin | NSViewMaxYMargin];
[self addSubview:imageView];
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect {
NSBezierPath* path = [NSBezierPath bezierPathWithOvalInRect:self.bounds];
NSColor* fillColor = [NSColor colorWithCalibratedWhite:0 alpha:shieldAlpha_];
[fillColor set];
[path fill];
}
@end
// HistoryOverlayController ////////////////////////////////////////////////////
@implementation HistoryOverlayController
- (id)initForMode:(HistoryOverlayMode)mode {
if ((self = [super init])) {
mode_ = mode;
DCHECK(mode == kHistoryOverlayModeBack ||
mode == kHistoryOverlayModeForward);
}
return self;
}
- (void)loadView {
const gfx::Image& image =
ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
mode_ == kHistoryOverlayModeBack ? IDR_SWIPE_BACK
: IDR_SWIPE_FORWARD);
contentView_.reset(
[[HistoryOverlayView alloc] initWithMode:mode_
image:image.ToNSImage()]);
self.view = contentView_;
}
- (void)setProgress:(CGFloat)gestureAmount finished:(BOOL)finished {
NSRect parentFrame = [parent_ frame];
// When tracking the gesture, the height is constant and the alpha value
// changes from [0.25, 0.65].
CGFloat height = kShieldHeight;
CGFloat shieldAlpha = std::min(static_cast<CGFloat>(0.65),
std::max(gestureAmount,
static_cast<CGFloat>(0.25)));
// When the gesture is very likely to be completed (90% in this case), grow
// the semicircle's height and lock the alpha to 0.75.
if (finished) {
height += kShieldHeightCompletionAdjust;
shieldAlpha = 0.75;
}
// Compute the new position based on the progress.
NSRect frame = self.view.frame;
frame.size.height = height;
frame.origin.y = (NSHeight(parentFrame) / 2) - (height / 2);
CGFloat width = std::min(kShieldRadius * gestureAmount, kShieldRadius);
if (mode_ == kHistoryOverlayModeForward)
frame.origin.x = NSMaxX(parentFrame) - width;
else if (mode_ == kHistoryOverlayModeBack)
frame.origin.x = NSMinX(parentFrame) - kShieldWidth + width;
self.view.frame = frame;
[contentView_ setShieldAlpha:shieldAlpha];
[contentView_ setNeedsDisplay:YES];
}
- (void)showPanelForView:(NSView*)view {
parent_.reset([view retain]);
[self setProgress:0 finished:NO]; // Set initial view position.
[parent_ addSubview:self.view];
}
- (void)dismiss {
const CGFloat kFadeOutDurationSeconds = 0.4;
[NSAnimationContext beginGrouping];
[NSAnimationContext currentContext].duration = kFadeOutDurationSeconds;
NSView* overlay = self.view;
base::scoped_nsobject<CAAnimation> animation(
[[overlay animationForKey:@"alphaValue"] copy]);
[animation setDelegate:self];
[animation setDuration:kFadeOutDurationSeconds];
NSMutableDictionary* dictionary =
[NSMutableDictionary dictionaryWithCapacity:1];
[dictionary setObject:animation forKey:@"alphaValue"];
[overlay setAnimations:dictionary];
[[overlay animator] setAlphaValue:0.0];
[NSAnimationContext endGrouping];
}
- (void)animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)finished {
[self.view removeFromSuperview];
// Destroy the CAAnimation and its strong reference to its delegate (this
// class).
[self.view setAnimations:nil];
}
@end
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