renderthemechromiumwin.cpp

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

/*
 * This file is part of the WebKit project.
 *
 * Copyright (C) 2006 Apple Computer, Inc.
 * Copyright (C) 2008, 2009 Google, Inc.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

#include "config.h"
#include "RenderThemeChromiumWin.h"

#include <windows.h>
#include <uxtheme.h>
#include <vssym32.h>

#include "ChromiumBridge.h"
#include "CSSStyleSheet.h"
#include "CSSValueKeywords.h"
#include "Document.h"
#include "FontSelector.h"
#include "FontUtilsChromiumWin.h"
#include "GraphicsContext.h"
#include "RenderBox.h"
#include "ScrollbarTheme.h"
#include "SkiaUtils.h"
#include "TransparencyWin.h"
#include "UserAgentStyleSheets.h"
#include "WindowsVersion.h"

// FIXME: This dependency should eventually be removed.
#include <skia/ext/skia_utils_win.h>

#define SIZEOF_STRUCT_WITH_SPECIFIED_LAST_MEMBER(structName, member) \
    offsetof(structName, member) + \
    (sizeof static_cast<structName*>(0)->member)
#define NONCLIENTMETRICS_SIZE_PRE_VISTA \
    SIZEOF_STRUCT_WITH_SPECIFIED_LAST_MEMBER(NONCLIENTMETRICS, lfMessageFont)

namespace WebCore {

namespace {

bool canvasHasMultipleLayers(const SkCanvas* canvas)
{
    SkCanvas::LayerIter iter(const_cast<SkCanvas*>(canvas), false);
    iter.next();  // There is always at least one layer.
    return !iter.done();  // There is > 1 layer if the the iterator can stil advance.
}

class ThemePainter : public TransparencyWin {
public:
    ThemePainter(GraphicsContext* context, const IntRect& r)
    {
        TransformMode transformMode = getTransformMode(context->getCTM());
        init(context, getLayerMode(context, transformMode), transformMode, r);
    }

private:
    static LayerMode getLayerMode(GraphicsContext* context, TransformMode transformMode)
    {
        if (context->platformContext()->isDrawingToImageBuffer())  // Might have transparent background.
            return WhiteLayer;
        else if (canvasHasMultipleLayers(context->platformContext()->canvas()))  // Needs antialiasing help.
            return OpaqueCompositeLayer;
        else  // Nothing interesting.
            return transformMode == KeepTransform ? NoLayer : OpaqueCompositeLayer;
    }

    static TransformMode getTransformMode(const TransformationMatrix& matrix)
    {
        if (matrix.b() != 0 || matrix.c() != 0)  // Skew.
            return Untransform;
        else if (matrix.a() != 1.0 || matrix.d() != 1.0)  // Scale.
            return ScaleTransform;
        else  // Nothing interesting.
            return KeepTransform;
    }
};

}  // namespace

static void getNonClientMetrics(NONCLIENTMETRICS* metrics) {
    static UINT size = WebCore::isVistaOrNewer() ?
        sizeof(NONCLIENTMETRICS) : NONCLIENTMETRICS_SIZE_PRE_VISTA;
    metrics->cbSize = size;
    bool success = !!SystemParametersInfo(SPI_GETNONCLIENTMETRICS, size, metrics, 0);
    ASSERT(success);
}

enum PaddingType {
    TopPadding,
    RightPadding,
    BottomPadding,
    LeftPadding
};

static const int styledMenuListInternalPadding[4] = { 1, 4, 1, 4 };

// The default variable-width font size.  We use this as the default font
// size for the "system font", and as a base size (which we then shrink) for
// form control fonts.
static float defaultFontSize = 16.0;

static FontDescription smallSystemFont;
static FontDescription menuFont;
static FontDescription labelFont;

bool RenderThemeChromiumWin::m_findInPageMode = false;

// Internal static helper functions.  We don't put them in an anonymous
// namespace so they have easier access to the WebCore namespace.

static bool supportsFocus(ControlPart appearance)
{
    switch (appearance) {
    case PushButtonPart:
    case ButtonPart:
    case DefaultButtonPart:
    case TextFieldPart:
    case TextAreaPart:
        return true;
    }
    return false;
}

static void setFixedPadding(RenderStyle* style, const int padding[4])
{
    style->setPaddingLeft(Length(padding[LeftPadding], Fixed));
    style->setPaddingRight(Length(padding[RightPadding], Fixed));
    style->setPaddingTop(Length(padding[TopPadding], Fixed));
    style->setPaddingBottom(Length(padding[BottomPadding], Fixed));
}

// Return the height of system font |font| in pixels.  We use this size by
// default for some non-form-control elements.
static float systemFontSize(const LOGFONT& font)
{
    float size = -font.lfHeight;
    if (size < 0) {
        HFONT hFont = CreateFontIndirect(&font);
        if (hFont) {
            HDC hdc = GetDC(0);  // What about printing?  Is this the right DC?
            if (hdc) {
                HGDIOBJ hObject = SelectObject(hdc, hFont);
                TEXTMETRIC tm;
                GetTextMetrics(hdc, &tm);
                SelectObject(hdc, hObject);
                ReleaseDC(0, hdc);
                size = tm.tmAscent;
            }
            DeleteObject(hFont);
        }
    }

    // The "codepage 936" bit here is from Gecko; apparently this helps make
    // fonts more legible in Simplified Chinese where the default font size is
    // too small.
    //
    // FIXME: http://b/1119883 Since this is only used for "small caption",
    // "menu", and "status bar" objects, I'm not sure how much this even
    // matters.  Plus the Gecko patch went in back in 2002, and maybe this
    // isn't even relevant anymore.  We should investigate whether this should
    // be removed, or perhaps broadened to be "any CJK locale".
    //
    return ((size < 12.0f) && (GetACP() == 936)) ? 12.0f : size;
}

// We aim to match IE here.
// -IE uses a font based on the encoding as the default font for form controls.
// -Gecko uses MS Shell Dlg (actually calls GetStockObject(DEFAULT_GUI_FONT),
// which returns MS Shell Dlg)
// -Safari uses Lucida Grande.
//
// FIXME: The only case where we know we don't match IE is for ANSI encodings.
// IE uses MS Shell Dlg there, which we render incorrectly at certain pixel
// sizes (e.g. 15px). So, for now we just use Arial.
static wchar_t* defaultGUIFont(Document* document)
{
    UScriptCode dominantScript = document->dominantScript();
    const wchar_t* family = NULL;

    // FIXME: Special-casing of Latin/Greeek/Cyrillic should go away once
    // GetFontFamilyForScript is enhanced to support GenericFamilyType for
    // real. For now, we make sure that we use Arial to match IE for those
    // scripts.
    if (dominantScript != USCRIPT_LATIN &&
        dominantScript != USCRIPT_CYRILLIC &&
        dominantScript != USCRIPT_GREEK &&
        dominantScript != USCRIPT_INVALID_CODE) {
        family = getFontFamilyForScript(dominantScript, FontDescription::NoFamily);
        if (family)
            return const_cast<wchar_t*>(family);
    }
    return L"Arial";
}

// Converts |points| to pixels.  One point is 1/72 of an inch.
static float pointsToPixels(float points)
{
    static float pixelsPerInch = 0.0f;
    if (!pixelsPerInch) {
        HDC hdc = GetDC(0);  // What about printing?  Is this the right DC?
        if (hdc) {  // Can this ever actually be NULL?
            pixelsPerInch = GetDeviceCaps(hdc, LOGPIXELSY);
            ReleaseDC(0, hdc);
        } else {
            pixelsPerInch = 96.0f;
        }
    }

    static const float pointsPerInch = 72.0f;
    return points / pointsPerInch * pixelsPerInch;
}

static void setSizeIfAuto(RenderStyle* style, const IntSize& size)
{
    if (style->width().isIntrinsicOrAuto())
        style->setWidth(Length(size.width(), Fixed));
    if (style->height().isAuto())
        style->setHeight(Length(size.height(), Fixed));
}

static double querySystemBlinkInterval(double defaultInterval)
{
    UINT blinkTime = GetCaretBlinkTime();
    if (blinkTime == 0)
        return defaultInterval;
    if (blinkTime == INFINITE)
        return 0;
    return blinkTime / 1000.0;
}

// Implement WebCore::theme() for getting the global RenderTheme.
RenderTheme* theme()
{
    static RenderThemeChromiumWin winTheme;
    return &winTheme;
}

String RenderThemeChromiumWin::extraDefaultStyleSheet()
{
    return String(themeWinUserAgentStyleSheet, sizeof(themeWinUserAgentStyleSheet));
}

String RenderThemeChromiumWin::extraQuirksStyleSheet()
{
    return String(themeWinQuirksUserAgentStyleSheet, sizeof(themeWinQuirksUserAgentStyleSheet));
}

bool RenderThemeChromiumWin::supportsFocusRing(const RenderStyle* style) const
{
   // Let webkit draw one of its halo rings around any focused element,
   // except push buttons. For buttons we use the windows PBS_DEFAULTED
   // styling to give it a blue border.
   return style->appearance() == ButtonPart
       || style->appearance() == PushButtonPart;
}

Color RenderThemeChromiumWin::platformActiveSelectionBackgroundColor() const
{
    if (ChromiumBridge::layoutTestMode())
        return Color("#0000FF");  // Royal blue.
    if (m_findInPageMode)
        return Color(255, 150, 50, 200);  // Orange.
    COLORREF color = GetSysColor(COLOR_HIGHLIGHT);
    return Color(GetRValue(color), GetGValue(color), GetBValue(color), 255);
}

Color RenderThemeChromiumWin::platformInactiveSelectionBackgroundColor() const
{
    if (ChromiumBridge::layoutTestMode())
        return Color("#999999");  // Medium gray.
    if (m_findInPageMode)
        return Color(255, 150, 50, 200);  // Orange.
    COLORREF color = GetSysColor(COLOR_GRAYTEXT);
    return Color(GetRValue(color), GetGValue(color), GetBValue(color), 255);
}

Color RenderThemeChromiumWin::platformActiveSelectionForegroundColor() const
{
    if (ChromiumBridge::layoutTestMode())
        return Color("#FFFFCC");  // Pale yellow.
    COLORREF color = GetSysColor(COLOR_HIGHLIGHTTEXT);
    return Color(GetRValue(color), GetGValue(color), GetBValue(color), 255);
}

Color RenderThemeChromiumWin::platformInactiveSelectionForegroundColor() const
{
    return Color::white;
}

Color RenderThemeChromiumWin::platformTextSearchHighlightColor() const
{
    return Color(255, 255, 150);
}

double RenderThemeChromiumWin::caretBlinkInterval() const
{
    // Disable the blinking caret in layout test mode, as it introduces
    // a race condition for the pixel tests. http://b/1198440
    if (ChromiumBridge::layoutTestMode())
        return 0;

    // This involves a system call, so we cache the result.
    static double blinkInterval = querySystemBlinkInterval(RenderTheme::caretBlinkInterval());
    return blinkInterval;
}

void RenderThemeChromiumWin::systemFont(int propId, Document* document, FontDescription& fontDescription) const
{
    // This logic owes much to RenderThemeSafari.cpp.
    FontDescription* cachedDesc = NULL;
    wchar_t* faceName = 0;
    float fontSize = 0;
    switch (propId) {
    case CSSValueSmallCaption:
        cachedDesc = &smallSystemFont;
        if (!smallSystemFont.isAbsoluteSize()) {
            NONCLIENTMETRICS metrics;
            getNonClientMetrics(&metrics);
            faceName = metrics.lfSmCaptionFont.lfFaceName;