src/chrome/browser/ui/cocoa/custom_frame_view.mm

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import "chrome/browser/ui/cocoa/custom_frame_view.h"
   6
   7 #import <objc/runtime.h>
   8 #import <Carbon/Carbon.h>
   9
  10 #include "base/logging.h"
  11 #include "base/mac/mac_util.h"
  12 #include "base/mac/scoped_nsautorelease_pool.h"
  13
  14 namespace {
  15 BOOL gCanDrawTitle = NO;
  16 BOOL gCanGetCornerRadius = NO;
  17 }  // namespace
  18
  19 @interface NSView (Swizzles)
  20 - (void)drawRectOriginal:(NSRect)rect;
  21 - (NSPoint)_fullScreenButtonOriginOriginal;
  22 @end
  23
  24 @interface NSWindow (FramedBrowserWindow)
  25 - (NSPoint)fullScreenButtonOriginAdjustment;
  26 @end
  27
  28 @implementation NSWindow (CustomFrameView)
  29 - (void)drawCustomFrameRect:(NSRect)rect forView:(NSView*)view {
  30   [view drawRectOriginal:rect];
  31 }
  32 @end
  33
  34 @interface CustomFrameView : NSView
  35
  36 @end
  37
  38 @implementation CustomFrameView
  39
  40 // This is where we swizzle drawRect, and add in two methods that we
  41 // need. If any of these fail it shouldn't affect the functionality of the
  42 // others. If they all fail, we will lose window frame theming and
  43 // roll overs for our close widgets, but things should still function
  44 // correctly.
  45 + (void)load {
  46   base::mac::ScopedNSAutoreleasePool pool;
  47
  48   // On 10.8+ the background for textured windows are no longer drawn by
  49   // NSGrayFrame, and NSThemeFrame is used instead <http://crbug.com/114745>.
  50   Class borderViewClass = NSClassFromString(
  51       base::mac::IsOSMountainLionOrLater() ? @"NSThemeFrame" : @"NSGrayFrame");
  52   DCHECK(borderViewClass);
  53   if (!borderViewClass) return;
  54
  55   // Exchange draw rect.
  56   Method m0 = class_getInstanceMethod([self class], @selector(drawRect:));
  57   DCHECK(m0);
  58   if (m0) {
  59     BOOL didAdd = class_addMethod(borderViewClass,
  60                                   @selector(drawRectOriginal:),
  61                                   method_getImplementation(m0),
  62                                   method_getTypeEncoding(m0));
  63     DCHECK(didAdd);
  64     if (didAdd) {
  65       Method m1 = class_getInstanceMethod(borderViewClass,
  66                                           @selector(drawRect:));
  67       Method m2 = class_getInstanceMethod(borderViewClass,
  68                                           @selector(drawRectOriginal:));
  69       DCHECK(m1 && m2);
  70       if (m1 && m2) {
  71         method_exchangeImplementations(m1, m2);
  72       }
  73     }
  74   }
  75
  76   // Swizzle the method that sets the origin for the Lion fullscreen button. Do
  77   // nothing if it cannot be found.
  78   m0 = class_getInstanceMethod([self class],
  79                                @selector(_fullScreenButtonOrigin));
  80   if (m0) {
  81     BOOL didAdd = class_addMethod(borderViewClass,
  82                                   @selector(_fullScreenButtonOriginOriginal),
  83                                   method_getImplementation(m0),
  84                                   method_getTypeEncoding(m0));
  85     if (didAdd) {
  86       Method m1 = class_getInstanceMethod(borderViewClass,
  87                                           @selector(_fullScreenButtonOrigin));
  88       Method m2 = class_getInstanceMethod(borderViewClass,
  89           @selector(_fullScreenButtonOriginOriginal));
  90       if (m1 && m2) {
  91         method_exchangeImplementations(m1, m2);
  92       }
  93     }
  94   }
  95 }
  96
  97 + (BOOL)canDrawTitle {
  98   return gCanDrawTitle;
  99 }
 100
 101 + (BOOL)canGetCornerRadius {
 102   return gCanGetCornerRadius;
 103 }
 104
 105 - (id)initWithFrame:(NSRect)frame {
 106   // This class is not for instantiating.
 107   [self doesNotRecognizeSelector:_cmd];
 108   return nil;
 109 }
 110
 111 - (id)initWithCoder:(NSCoder*)coder {
 112   // This class is not for instantiating.
 113   [self doesNotRecognizeSelector:_cmd];
 114   return nil;
 115 }
 116
 117 // Here is our custom drawing for our frame.
 118 - (void)drawRect:(NSRect)rect {
 119   // Delegate drawing to the window, whose default implementation (above) is to
 120   // call into the original implementation.
 121   [[self window] drawCustomFrameRect:rect forView:self];
 122 }
 123
 124 // Override to move the fullscreen button to the left of the profile avatar.
 125 - (NSPoint)_fullScreenButtonOrigin {
 126   NSWindow* window = [self window];
 127   NSPoint offset = NSZeroPoint;
 128
 129   if ([window respondsToSelector:@selector(fullScreenButtonOriginAdjustment)])
 130     offset = [window fullScreenButtonOriginAdjustment];
 131
 132   NSPoint origin = [self _fullScreenButtonOriginOriginal];
 133   origin.x += offset.x;
 134   origin.y += offset.y;
 135   return origin;
 136 }
 137
 138 @end