Mac: Add tabpose window

chrome/browser/cocoa/tabpose_window.mm

+// 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/tabpose_window.h"
+
+#import <QuartzCore/QuartzCore.h>
+
+const int kTopGradientHeight  = 15;
+
+// CAGradientLayer is 10.6-only -- roll our own.
+@interface DarkGradientLayer : CALayer
+- (void)drawInContext:(CGContextRef)context;
+@end
+
+@implementation DarkGradientLayer
+- (void)drawInContext:(CGContextRef)context {
+  scoped_cftyperef<CGColorSpaceRef> grayColorSpace(
+      CGColorSpaceCreateWithName(kCGColorSpaceGenericGray));
+  CGFloat grays[] = { 0.277, 1.0, 0.39, 1.0 };
+  CGFloat locations[] = { 0, 1 };
+  scoped_cftyperef<CGGradientRef> gradient(CGGradientCreateWithColorComponents(
+      grayColorSpace.get(), grays, locations, arraysize(locations)));
+  CGPoint topLeft = CGPointMake(0.0, kTopGradientHeight);
+  CGContextDrawLinearGradient(context, gradient.get(), topLeft, CGPointZero, 0);
+}
+@end
+
+@interface TabposeWindow (Private)
+- (id)initForWindow:(NSWindow*)parent rect:(NSRect)rect slomo:(BOOL)slomo;
+- (void)setUpLayers:(NSRect)bgLayerRect;
+@end
+
+@implementation TabposeWindow
+
++ (id)openTabposeFor:(NSWindow*)parent rect:(NSRect)rect slomo:(BOOL)slomo {
+  // Releases itself when closed.
+  return [[TabposeWindow alloc] initForWindow:parent rect:rect slomo:slomo];
+}
+
+- (id)initForWindow:(NSWindow*)parent rect:(NSRect)rect slomo:(BOOL)slomo {
+  NSRect frame = [parent frame];
+  if ((self = [super initWithContentRect:frame
+                               styleMask:NSBorderlessWindowMask
+                                 backing:NSBackingStoreBuffered
+                                   defer:NO])) {
+    [self setReleasedWhenClosed:YES];
+    [self setOpaque:NO];
+    [self setBackgroundColor:[NSColor clearColor]];
+    [self setUpLayers:rect];
+    [parent addChildWindow:self ordered:NSWindowAbove];
+    [self makeKeyAndOrderFront:self];
+  }
+  return self;
+}
+
+- (void)setUpLayers:(NSRect)bgLayerRect {
+  // Root layer -- covers whole window.
+  rootLayer_ = [CALayer layer];
+  [[self contentView] setLayer:rootLayer_];
+  [[self contentView] setWantsLayer:YES];
+
+  // Background layer -- the visible part of the window.
+  gray_.reset(CGColorCreateGenericGray(0.39, 1.0));
+  bgLayer_ = [CALayer layer];
+  bgLayer_.backgroundColor = gray_;
+  bgLayer_.frame = NSRectToCGRect(bgLayerRect);
+  bgLayer_.masksToBounds = YES;
+  [rootLayer_ addSublayer:bgLayer_];
+
+  // Top gradient.
+  CALayer* gradientLayer = [DarkGradientLayer layer];
+  gradientLayer.frame = CGRectMake(
+      0,
+      NSHeight(bgLayerRect) - kTopGradientHeight,
+      NSWidth(bgLayerRect),
+      kTopGradientHeight);
+  [gradientLayer setNeedsDisplay];  // Draw once.
+  [bgLayer_ addSublayer:gradientLayer];
+}
+
+- (BOOL)canBecomeKeyWindow {
+ return YES;
+}
+
+- (void)keyDown:(NSEvent*)event {
+  // Overridden to prevent beeps.
+}
+
+- (void)keyUp:(NSEvent*)event {
+  NSString* characters = [event characters];
+  if ([characters length] < 1)
+    return;
+
+  unichar character = [characters characterAtIndex:0];
+  switch (character) {
+    case NSEnterCharacter:
+    case NSNewlineCharacter:
+    case NSCarriageReturnCharacter:
+    case ' ':
+    case '\e':  // Escape
+      [self close];
+      break;
+  }
+}
+
+- (void)mouseDown:(NSEvent*)event {
+ [self close];
+}
+
+- (void)swipeWithEvent:(NSEvent*)event {
+  if ([event deltaY] > 0.5)  // Swipe up
+    [self close];
+}
+
+- (void)close {
+  // Prevent parent window from disappearing.
+  [[self parentWindow] removeChildWindow:self];
+  [super close];
+}
+
+- (void)commandDispatch:(id)sender {
+  // Without this, -validateUserInterfaceItem: is not called.
+}
+
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {
+  // Disable all browser-related menu items.
+  return NO;
+}
+
+@end