renderthememac.mm

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#import "config.h"
#import "RenderThemeMac.h"

#import "BitmapImage.h"
#import "CSSStyleSelector.h"
#import "CSSValueKeywords.h"
#import "Document.h"
#import "Element.h"
#import "FrameView.h"
#import "GraphicsContext.h"
#import "HTMLInputElement.h"
#import "HTMLMediaElement.h"
#import "HTMLNames.h"
#import "Image.h"
#import "LocalCurrentGraphicsContext.h"
#import "MediaControlElements.h"
#import "RenderSlider.h"
#import "RenderView.h"
#import "SharedBuffer.h"
#import "WebCoreSystemInterface.h"
#import "UserAgentStyleSheets.h"
#import <Carbon/Carbon.h>
#import <Cocoa/Cocoa.h>
#import <wtf/RetainPtr.h>
#import <wtf/StdLibExtras.h>
#import <math.h>

#ifdef BUILDING_ON_TIGER
typedef int NSInteger;
typedef unsigned NSUInteger;
#endif

using std::min;

// The methods in this file are specific to the Mac OS X platform.

// FIXME: The platform-independent code in this class should be factored out and merged with RenderThemeSafari. 

@interface WebCoreRenderThemeNotificationObserver : NSObject
{
    WebCore::RenderTheme *_theme;
}

- (id)initWithTheme:(WebCore::RenderTheme *)theme;
- (void)systemColorsDidChange:(NSNotification *)notification;

@end

@implementation WebCoreRenderThemeNotificationObserver

- (id)initWithTheme:(WebCore::RenderTheme *)theme
{
    [super init];
    _theme = theme;
    
    return self;
}

- (void)systemColorsDidChange:(NSNotification *)unusedNotification
{
    ASSERT_UNUSED(unusedNotification, [[unusedNotification name] isEqualToString:NSSystemColorsDidChangeNotification]);
    _theme->platformColorsDidChange();
}

@end

namespace WebCore {

using namespace HTMLNames;

enum {
    topMargin,
    rightMargin,
    bottomMargin,
    leftMargin
};

enum {
    topPadding,
    rightPadding,
    bottomPadding,
    leftPadding
};

RenderTheme* theme()
{
    static RenderThemeMac* macTheme = new RenderThemeMac;
    return macTheme;
}

RenderThemeMac::RenderThemeMac()
    : m_isSliderThumbHorizontalPressed(false)
    , m_isSliderThumbVerticalPressed(false)
    , m_notificationObserver(AdoptNS, [[WebCoreRenderThemeNotificationObserver alloc] initWithTheme:this])
{
    [[NSNotificationCenter defaultCenter] addObserver:m_notificationObserver.get()
                                                        selector:@selector(systemColorsDidChange:)
                                                            name:NSSystemColorsDidChangeNotification
                                                          object:nil];
}

RenderThemeMac::~RenderThemeMac()
{
    [[NSNotificationCenter defaultCenter] removeObserver:m_notificationObserver.get()];
}

Color RenderThemeMac::platformActiveSelectionBackgroundColor() const
{
    NSColor* color = [[NSColor selectedTextBackgroundColor] colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    return Color(static_cast<int>(255.0 * [color redComponent]), static_cast<int>(255.0 * [color greenComponent]), static_cast<int>(255.0 * [color blueComponent]));
}

Color RenderThemeMac::platformInactiveSelectionBackgroundColor() const
{
    NSColor* color = [[NSColor secondarySelectedControlColor] colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    return Color(static_cast<int>(255.0 * [color redComponent]), static_cast<int>(255.0 * [color greenComponent]), static_cast<int>(255.0 * [color blueComponent]));
}

Color RenderThemeMac::platformActiveListBoxSelectionBackgroundColor() const
{
    NSColor* color = [[NSColor alternateSelectedControlColor] colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    return Color(static_cast<int>(255.0 * [color redComponent]), static_cast<int>(255.0 * [color greenComponent]), static_cast<int>(255.0 * [color blueComponent]));
}

Color RenderThemeMac::platformActiveListBoxSelectionForegroundColor() const
{
    return Color::white;
}

Color RenderThemeMac::platformInactiveListBoxSelectionForegroundColor() const
{
    return Color::black;
}

Color RenderThemeMac::platformInactiveListBoxSelectionBackgroundColor() const
{
    return platformInactiveSelectionBackgroundColor();
}

static FontWeight toFontWeight(NSInteger appKitFontWeight)
{
    ASSERT(appKitFontWeight > 0 && appKitFontWeight < 15);
    if (appKitFontWeight > 14)
        appKitFontWeight = 14;
    else if (appKitFontWeight < 1)
        appKitFontWeight = 1;

    static FontWeight fontWeights[] = {
        FontWeight100,
        FontWeight100,
        FontWeight200,
        FontWeight300,
        FontWeight400,
        FontWeight500,
        FontWeight600,
        FontWeight600,
        FontWeight700,
        FontWeight800,
        FontWeight800,
        FontWeight900,
        FontWeight900,
        FontWeight900
    };
    return fontWeights[appKitFontWeight - 1];
}

void RenderThemeMac::systemFont(int cssValueId, FontDescription& fontDescription) const
{
    DEFINE_STATIC_LOCAL(FontDescription, systemFont, ());
    DEFINE_STATIC_LOCAL(FontDescription, smallSystemFont, ());
    DEFINE_STATIC_LOCAL(FontDescription, menuFont, ());
    DEFINE_STATIC_LOCAL(FontDescription, labelFont, ());
    DEFINE_STATIC_LOCAL(FontDescription, miniControlFont, ());
    DEFINE_STATIC_LOCAL(FontDescription, smallControlFont, ());
    DEFINE_STATIC_LOCAL(FontDescription, controlFont, ());

    FontDescription* cachedDesc;
    NSFont* font = nil;
    switch (cssValueId) {
        case CSSValueSmallCaption:
            cachedDesc = &smallSystemFont;
            if (!smallSystemFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
            break;
        case CSSValueMenu:
            cachedDesc = &menuFont;
            if (!menuFont.isAbsoluteSize())
                font = [NSFont menuFontOfSize:[NSFont systemFontSize]];
            break;
        case CSSValueStatusBar:
            cachedDesc = &labelFont;
            if (!labelFont.isAbsoluteSize())
                font = [NSFont labelFontOfSize:[NSFont labelFontSize]];
            break;
        case CSSValueWebkitMiniControl:
            cachedDesc = &miniControlFont;
            if (!miniControlFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSMiniControlSize]];
            break;
        case CSSValueWebkitSmallControl:
            cachedDesc = &smallControlFont;
            if (!smallControlFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSSmallControlSize]];
            break;
        case CSSValueWebkitControl:
            cachedDesc = &controlFont;
            if (!controlFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSRegularControlSize]];
            break;
        default:
            cachedDesc = &systemFont;
            if (!systemFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSize]];
    }

    if (font) {
        NSFontManager *fontManager = [NSFontManager sharedFontManager];
        cachedDesc->setIsAbsoluteSize(true);
        cachedDesc->setGenericFamily(FontDescription::NoFamily);
        cachedDesc->firstFamily().setFamily([font familyName]);
        cachedDesc->setSpecifiedSize([font pointSize]);
        cachedDesc->setWeight(toFontWeight([fontManager weightOfFont:font]));
        cachedDesc->setItalic([fontManager traitsOfFont:font] & NSItalicFontMask);
    }
    fontDescription = *cachedDesc;
}

static RGBA32 convertNSColorToColor(NSColor *color)
{
    NSColor *colorInColorSpace = [color colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    if (colorInColorSpace) {
        static const double scaleFactor = nextafter(256.0, 0.0);
        return makeRGB(static_cast<int>(scaleFactor * [colorInColorSpace redComponent]),
            static_cast<int>(scaleFactor * [colorInColorSpace greenComponent]),
            static_cast<int>(scaleFactor * [colorInColorSpace blueComponent]));
    }

    // This conversion above can fail if the NSColor in question is an NSPatternColor 
    // (as many system colors are). These colors are actually a repeating pattern
    // not just a solid color. To work around this we simply draw a 1x1 image of
    // the color and use that pixel's color. It might be better to use an average of
    // the colors in the pattern instead.
    NSBitmapImageRep *offscreenRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:nil
                                                                             pixelsWide:1
                                                                             pixelsHigh:1
                                                                          bitsPerSample:8
                                                                        samplesPerPixel:4
                                                                               hasAlpha:YES
                                                                               isPlanar:NO
                                                                         colorSpaceName:NSDeviceRGBColorSpace
                                                                            bytesPerRow:4
                                                                           bitsPerPixel:32];

    [NSGraphicsContext saveGraphicsState];
    [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithBitmapImageRep:offscreenRep]];
    NSEraseRect(NSMakeRect(0, 0, 1, 1));
    [color drawSwatchInRect:NSMakeRect(0, 0, 1, 1)];
    [NSGraphicsContext restoreGraphicsState];

    NSUInteger pixel[4];
    [offscreenRep getPixel:pixel atX:0 y:0];

    [offscreenRep release];

    return makeRGB(pixel[0], pixel[1], pixel[2]);
}

static RGBA32 menuBackgroundColor()
{
    NSBitmapImageRep *offscreenRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:nil
                                                                             pixelsWide:1
                                                                             pixelsHigh:1
                                                                          bitsPerSample:8
                                                                        samplesPerPixel:4
                                                                               hasAlpha:YES
                                                                               isPlanar:NO
                                                                         colorSpaceName:NSDeviceRGBColorSpace
                                                                            bytesPerRow:4
                                                                           bitsPerPixel:32];

    CGContextRef context = static_cast<CGContextRef>([[NSGraphicsContext graphicsContextWithBitmapImageRep:offscreenRep] graphicsPort]);
    CGRect rect = CGRectMake(0, 0, 1, 1);
    HIThemeMenuDrawInfo drawInfo;
    drawInfo.version =  0;
    drawInfo.menuType = kThemeMenuTypePopUp;
    HIThemeDrawMenuBackground(&rect, &drawInfo, context, kHIThemeOrientationInverted);

    NSUInteger pixel[4];
    [offscreenRep getPixel:pixel atX:0 y:0];

    [offscreenRep release];

    return makeRGB(pixel[0], pixel[1], pixel[2]);
}

void RenderThemeMac::platformColorsDidChange()
{
    m_systemColorCache.clear();
    RenderTheme::platformColorsDidChange();
}

Color RenderThemeMac::systemColor(int cssValueId) const
{
    if (m_systemColorCache.contains(cssValueId))
        return m_systemColorCache.get(cssValueId);
    
    Color color;
    switch (cssValueId) {
        case CSSValueActiveborder:
            color = convertNSColorToColor([NSColor keyboardFocusIndicatorColor]);
            break;
        case CSSValueActivecaption:
            color = convertNSColorToColor([NSColor windowFrameTextColor]);
            break;
        case CSSValueAppworkspace:
            color = convertNSColorToColor([NSColor headerColor]);
            break;
        case CSSValueBackground: