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* This file is part of the theme implementation for form controls in WebCore.
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Computer, 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
* 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.
#ifndef LayoutTheme_h
#define LayoutTheme_h
#include "core/CoreExport.h"
#include "core/layout/LayoutObject.h"
#include "platform/ThemeTypes.h"
#include "platform/scroll/ScrollTypes.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/text/WTFString.h"
namespace blink {
class ComputedStyle;
class Element;
class FileList;
class HTMLInputElement;
class LayoutMeter;
class Theme;
class ThemePainter;
class CORE_EXPORT LayoutTheme : public RefCounted<LayoutTheme> {
explicit LayoutTheme(Theme*);
virtual ~LayoutTheme() { }
static LayoutTheme& theme();
virtual ThemePainter& painter() = 0;
static void setSizeIfAuto(ComputedStyle&, const IntSize&);
// This method is called whenever style has been computed for an element and the appearance
// property has been set to a value other than "none". The theme should map in all of the appropriate
// metrics and defaults given the contents of the style. This includes sophisticated operations like
// selection of control size based off the font, the disabling of appearance when certain other properties like
// "border" are set, or if the appearance is not supported by the theme.
void adjustStyle(ComputedStyle&, Element*);
// The remaining methods should be implemented by the platform-specific portion of the theme, e.g.,
// LayoutThemeMac.cpp for Mac OS X.
// These methods return the theme's extra style sheets rules, to let each platform
// adjust the default CSS rules in html.css, quirks.css or mediaControls.css.
virtual String extraDefaultStyleSheet();
virtual String extraQuirksStyleSheet() { return String(); }
virtual String extraMediaControlsStyleSheet() { return String(); }
virtual String extraFullScreenStyleSheet() { return String(); }
// A method to obtain the baseline position for a "leaf" control. This will only be used if a baseline
// position cannot be determined by examining child content. Checkboxes and radio buttons are examples of
// controls that need to do this.
virtual int baselinePosition(const LayoutObject*) const;
// A method for asking if a control is a container or not. Leaf controls have to have some special behavior (like
// the baseline position API above).
bool isControlContainer(ControlPart) const;
// Whether or not the control has been styled enough by the author to disable the native appearance.
virtual bool isControlStyled(const ComputedStyle&) const;
// Some controls may spill out of their containers (e.g., the check on an OSX 10.9 checkbox). Add this
// "visual overflow" to the object's border box rect.
virtual void addVisualOverflow(const LayoutObject&, IntRect& borderBox);
// This method is called whenever a control state changes on a particular themed object, e.g., the mouse becomes pressed
// or a control becomes disabled. The ControlState parameter indicates which state has changed (from having to not having,
// or vice versa).
bool controlStateChanged(LayoutObject&, ControlState) const;
bool shouldDrawDefaultFocusRing(const LayoutObject&) const;
// A method asking if the theme's controls actually care about redrawing when hovered.
virtual bool supportsHover(const ComputedStyle&) const { return false; }
// A method asking if the platform is able to show a calendar picker for a given input type.
virtual bool supportsCalendarPicker(const AtomicString&) const;
// Text selection colors.
Color activeSelectionBackgroundColor() const;
Color inactiveSelectionBackgroundColor() const;
Color activeSelectionForegroundColor() const;
Color inactiveSelectionForegroundColor() const;
// List box selection colors
Color activeListBoxSelectionBackgroundColor() const;
Color activeListBoxSelectionForegroundColor() const;
Color inactiveListBoxSelectionBackgroundColor() const;
Color inactiveListBoxSelectionForegroundColor() const;
// Highlight and text colors for TextMatches.
Color platformTextSearchHighlightColor(bool activeMatch) const;
Color platformTextSearchColor(bool activeMatch) const;
Color focusRingColor() const;
virtual Color platformFocusRingColor() const { return Color(0, 0, 0); }
void setCustomFocusRingColor(const Color&);
static Color tapHighlightColor();
virtual Color platformTapHighlightColor() const { return LayoutTheme::defaultTapHighlightColor; }
virtual Color platformDefaultCompositionBackgroundColor() const { return defaultCompositionBackgroundColor; }
virtual void platformColorsDidChange();
virtual double caretBlinkInterval() const { return 0.5; }
// System fonts and colors for CSS.
virtual void systemFont(CSSValueID systemFontID, FontStyle&, FontWeight&, float& fontSize, AtomicString& fontFamily) const = 0;
void systemFont(CSSValueID systemFontID, FontDescription&);
virtual Color systemColor(CSSValueID) const;
// Whether the default system font should have its average character width
// adjusted to match MS Shell Dlg.
virtual bool needsHackForTextControlWithFontFamily(const AtomicString&) const { return false; }
virtual int minimumMenuListSize(const ComputedStyle&) const { return 0; }
virtual void adjustSliderThumbSize(ComputedStyle&) const;
virtual int popupInternalPaddingLeft(const ComputedStyle&) const { return 0; }
virtual int popupInternalPaddingRight(const ComputedStyle&) const { return 0; }
virtual int popupInternalPaddingTop(const ComputedStyle&) const { return 0; }
virtual int popupInternalPaddingBottom(const ComputedStyle&) const { return 0; }
virtual bool popupOptionSupportsTextIndent() const { return false; }
virtual ScrollbarControlSize scrollbarControlSizeForPart(ControlPart) { return RegularScrollbar; }
// Returns the repeat interval of the animation for the progress bar.
virtual double animationRepeatIntervalForProgressBar() const;
// Returns the duration of the animation for the progress bar.
virtual double animationDurationForProgressBar() const;
// Media controls
String formatMediaControlsTime(float time) const;
String formatMediaControlsCurrentTime(float currentTime, float duration) const;
virtual IntSize meterSizeForBounds(const LayoutMeter&, const IntRect&) const;
virtual bool supportsMeter(ControlPart) const;
// Returns size of one slider tick mark for a horizontal track.
// For vertical tracks we rotate it and use it. i.e. Width is always length along the track.
virtual IntSize sliderTickSize() const = 0;
// Returns the distance of slider tick origin from the slider track center.
virtual int sliderTickOffsetFromTrackCenter() const = 0;
virtual bool shouldHaveSpinButton(HTMLInputElement*) const;
// Functions for <select> elements.
virtual bool delegatesMenuListRendering() const { return false; }
virtual bool popsMenuByArrowKeys() const { return false; }
virtual bool popsMenuBySpaceKey() const { return false; }
virtual bool popsMenuByReturnKey() const { return false; }
virtual bool popsMenuByAltDownUpOrF4Key() const { return false; }
virtual String fileListNameForWidth(Locale&, const FileList*, const Font&, int width) const;
virtual bool shouldOpenPickerWithF4Key() const;
virtual bool supportsSelectionForegroundColors() const { return true; }
virtual bool isModalColorChooser() const { return true; }
virtual bool shouldUseFallbackTheme(const ComputedStyle&) const;
// The platform selection color.
virtual Color platformActiveSelectionBackgroundColor() const;
virtual Color platformInactiveSelectionBackgroundColor() const;
virtual Color platformActiveSelectionForegroundColor() const;
virtual Color platformInactiveSelectionForegroundColor() const;
virtual Color platformActiveListBoxSelectionBackgroundColor() const;
virtual Color platformInactiveListBoxSelectionBackgroundColor() const;
virtual Color platformActiveListBoxSelectionForegroundColor() const;
virtual Color platformInactiveListBoxSelectionForegroundColor() const;
virtual bool themeDrawsFocusRing(const ComputedStyle&) const = 0;
// Methods for each appearance value.
virtual void adjustCheckboxStyle(ComputedStyle&) const;
virtual void setCheckboxSize(ComputedStyle&) const { }
virtual void adjustRadioStyle(ComputedStyle&) const;
virtual void setRadioSize(ComputedStyle&) const { }
virtual void adjustButtonStyle(ComputedStyle&) const;
virtual void adjustInnerSpinButtonStyle(ComputedStyle&) const;
virtual void adjustMenuListStyle(ComputedStyle&, Element*) const;
virtual void adjustMenuListButtonStyle(ComputedStyle&, Element*) const;
virtual void adjustSliderThumbStyle(ComputedStyle&) const;
virtual void adjustSearchFieldStyle(ComputedStyle&) const;
virtual void adjustSearchFieldCancelButtonStyle(ComputedStyle&) const;
virtual void adjustSearchFieldDecorationStyle(ComputedStyle&) const;
virtual void adjustSearchFieldResultsDecorationStyle(ComputedStyle&) const;
void adjustStyleUsingFallbackTheme(ComputedStyle&);
void adjustCheckboxStyleUsingFallbackTheme(ComputedStyle&) const;
void adjustRadioStyleUsingFallbackTheme(ComputedStyle&) const;
bool hasPlatformTheme() const { return m_platformTheme; }
// Methods for state querying
static ControlStates controlStatesForLayoutObject(const LayoutObject&);
static bool isActive(const LayoutObject&);
static bool isChecked(const LayoutObject&);
static bool isIndeterminate(const LayoutObject&);
static bool isEnabled(const LayoutObject&);
static bool isFocused(const LayoutObject&);
static bool isPressed(const LayoutObject&);
static bool isSpinUpButtonPartPressed(const LayoutObject&);
static bool isHovered(const LayoutObject&);
static bool isSpinUpButtonPartHovered(const LayoutObject&);
static bool isReadOnlyControl(const LayoutObject&);
// This function is to be implemented in your platform-specific theme implementation to hand back the
// appropriate platform theme.
static LayoutTheme& nativeTheme();
Color m_customFocusRingColor;
bool m_hasCustomFocusRingColor;
// This color is expected to be drawn on a semi-transparent overlay,
// making it more transparent than its alpha value indicates.
static const RGBA32 defaultTapHighlightColor = 0x66000000;
static const RGBA32 defaultCompositionBackgroundColor = 0xFFFFDD55;
Theme* m_platformTheme; // The platform-specific theme.
} // namespace blink
#endif // LayoutTheme_h