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// Copyright (c) 2009 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/browser_frame_view.h"
#import <objc/runtime.h>
#import <Carbon/Carbon.h>
#include "base/logging.h"
#include "base/scoped_nsautorelease_pool.h"
#import "chrome/browser/browser_theme_provider.h"
#import "chrome/browser/cocoa/chrome_browser_window.h"
#import "chrome/browser/cocoa/themed_window.h"
#include "grit/theme_resources.h"
@interface NSView (Swizzles)
- (void)drawRectOriginal:(NSRect)rect;
- (BOOL)_mouseInGroup:(NSButton*)widget;
- (void)updateTrackingAreas;
@end
@implementation BrowserFrameView
+ (void)load {
// This is where we swizzle drawRect, and add in two methods that we
// need. If any of these fail it shouldn't affect the functionality of the
// others. If they all fail, we will lose window frame theming and
// roll overs for our close widgets, but things should still function
// correctly.
base::ScopedNSAutoreleasePool pool;
Class grayFrameClass = NSClassFromString(@"NSGrayFrame");
DCHECK(grayFrameClass);
if (!grayFrameClass) return;
// Exchange draw rect
Method m0 = class_getInstanceMethod([self class], @selector(drawRect:));
DCHECK(m0);
if (m0) {
BOOL didAdd = class_addMethod(grayFrameClass,
@selector(drawRectOriginal:),
method_getImplementation(m0),
method_getTypeEncoding(m0));
DCHECK(didAdd);
if (didAdd) {
Method m1 = class_getInstanceMethod(grayFrameClass, @selector(drawRect:));
Method m2 = class_getInstanceMethod(grayFrameClass,
@selector(drawRectOriginal:));
DCHECK(m1 && m2);
if (m1 && m2) {
method_exchangeImplementations(m1, m2);
}
}
}
// Add _mouseInGroup
m0 = class_getInstanceMethod([self class], @selector(_mouseInGroup:));
DCHECK(m0);
if (m0) {
BOOL didAdd = class_addMethod(grayFrameClass,
@selector(_mouseInGroup:),
method_getImplementation(m0),
method_getTypeEncoding(m0));
DCHECK(didAdd);
}
// Add updateTrackingArea
m0 = class_getInstanceMethod([self class], @selector(updateTrackingAreas));
DCHECK(m0);
if (m0) {
BOOL didAdd = class_addMethod(grayFrameClass,
@selector(updateTrackingAreas),
method_getImplementation(m0),
method_getTypeEncoding(m0));
DCHECK(didAdd);
}
}
- (id)initWithFrame:(NSRect)frame {
// This class is not for instantiating.
[self doesNotRecognizeSelector:_cmd];
return nil;
}
- (id)initWithCoder:(NSCoder*)coder {
// This class is not for instantiating.
[self doesNotRecognizeSelector:_cmd];
return nil;
}
// Here is our custom drawing for our frame.
- (void)drawRect:(NSRect)rect {
[self drawRectOriginal:rect];
// If this isn't the window class we expect, then pass it on to the
// original implementation.
if (![[self window] isKindOfClass:[ChromeBrowserWindow class]]) {
return;
}
// Set up our clip.
NSWindow* window = [self window];
NSRect windowRect = [window frame];
windowRect.origin = NSMakePoint(0, 0);
[[NSBezierPath bezierPathWithRoundedRect:windowRect
xRadius:4
yRadius:4] addClip];
[[NSBezierPath bezierPathWithRect:rect] addClip];
// Do the theming.
[BrowserFrameView drawWindowThemeInDirtyRect:rect
forView:self
bounds:windowRect];
}
+ (void)drawWindowThemeInDirtyRect:(NSRect)dirtyRect
forView:(NSView*)view
bounds:(NSRect)bounds {
ThemeProvider* themeProvider = [[view window] themeProvider];
if (!themeProvider)
return;
BOOL active = [[view window] isMainWindow];
BOOL incognito = [[view window] themeIsIncognito];
// Find a theme image.
NSImage* themeImage = nil;
int themeImageID;
if (active && incognito)
themeImageID = IDR_THEME_FRAME_INCOGNITO;
else if (active && !incognito)
themeImageID = IDR_THEME_FRAME;
else if (!active && incognito)
themeImageID = IDR_THEME_FRAME_INCOGNITO_INACTIVE;
else
themeImageID = IDR_THEME_FRAME_INACTIVE;
if (themeProvider->HasCustomImage(IDR_THEME_FRAME))
themeImage = themeProvider->GetNSImageNamed(themeImageID, true);
// If no theme image, use a gradient if incognito.
NSGradient* gradient = nil;
if (!themeImage && incognito)
gradient = themeProvider->GetNSGradient(
active ? BrowserThemeProvider::GRADIENT_FRAME_INCOGNITO :
BrowserThemeProvider::GRADIENT_FRAME_INCOGNITO_INACTIVE);
if (themeImage) {
NSColor* themeImageColor = [NSColor colorWithPatternImage:themeImage];
// The titlebar/tabstrip header on the mac is slightly smaller than on
// Windows. To keep the window background lined up with the tab and toolbar
// patterns, we have to shift the pattern slightly, rather than simply
// drawing it from the top left corner. The offset below was empirically
// determined in order to line these patterns up.
//
// This will make the themes look slightly different than in Windows/Linux
// because of the differing heights between window top and tab top, but this
// has been approved by UI.
static const NSPoint kBrowserFrameViewPatternPhaseOffset = { -5, 3 };
NSPoint phase = kBrowserFrameViewPatternPhaseOffset;
phase.y += NSHeight(bounds);
phase = [view convertPoint:phase toView:nil];
[[NSGraphicsContext currentContext] setPatternPhase:phase];
[themeImageColor set];
NSRectFill(dirtyRect);
} else if (gradient) {
// Only paint the gradient at the top of the window. (This is at the maximum
// when fullscreening; before adjusting check this case.)
static const CGFloat kBrowserFrameViewGradientHeight = 52.0;
NSRect gradientRect = bounds;
gradientRect.origin.y = NSMaxY(gradientRect) -
kBrowserFrameViewGradientHeight;
gradientRect.size.height = kBrowserFrameViewGradientHeight;
[gradient drawInRect:gradientRect angle:270];
}
// Check to see if we have an overlay image.
NSImage* overlayImage =
themeProvider->GetNSImageNamed(active ? IDR_THEME_FRAME_OVERLAY :
IDR_THEME_FRAME_OVERLAY_INACTIVE,
false);
if (overlayImage) {
// Anchor to top-left and don't scale.
NSSize overlaySize = [overlayImage size];
NSRect imageFrame = NSMakeRect(0, 0, overlaySize.width, overlaySize.height);
[overlayImage drawAtPoint:NSMakePoint(0, NSHeight(bounds) -
overlaySize.height)
fromRect:imageFrame
operation:NSCompositeSourceOver
fraction:1.0];
}
}
// Check to see if the mouse is currently in one of our window widgets.
- (BOOL)_mouseInGroup:(NSButton*)widget {
BOOL mouseInGroup = NO;
if ([[self window] isKindOfClass:[ChromeBrowserWindow class]]) {
ChromeBrowserWindow* window =
static_cast<ChromeBrowserWindow*>([self window]);
mouseInGroup = [window mouseInGroup:widget];
} else if ([super respondsToSelector:@selector(_mouseInGroup:)]) {
mouseInGroup = [super _mouseInGroup:widget];
}
return mouseInGroup;
}
// Let our window handle updating the window widget tracking area.
- (void)updateTrackingAreas {
[super updateTrackingAreas];
if ([[self window] isKindOfClass:[ChromeBrowserWindow class]]) {
ChromeBrowserWindow* window =
static_cast<ChromeBrowserWindow*>([self window]);
[window updateTrackingAreas];
}
}
@end
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