/* * Copyright (C) 2008 Apple Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef Theme_h #define Theme_h #include "Color.h" #include "Font.h" #include "IntRect.h" #include "LengthBox.h" #include "LengthSize.h" #include "PlatformString.h" #include "ThemeTypes.h" namespace WebCore { class GraphicsContext; class ScrollView; // Unlike other platform classes, Theme does extensively use virtual functions. This design allows a platform to switch between multiple themes at runtime. class Theme { public: Theme() { } virtual ~Theme() { } // A method to obtain the baseline position adjustment 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. The adjustment is an offset that adds to the baseline, e.g., marginTop() + height() + |offset|. // The offset is not zoomed. virtual int baselinePositionAdjustment(ControlPart) const { return 0; } // A method asking if the control changes its appearance when the window is inactive. virtual bool controlHasInactiveAppearance(ControlPart) const { return false; } // General methods for whether or not any of the controls in the theme change appearance when the window is inactive or // when hovered over. virtual bool controlsCanHaveInactiveAppearance() const { return false; } virtual bool controlsCanHaveHoveredAppearance() const { return false; } // Used by RenderTheme::isControlStyled to figure out if the native look and feel should be turned off. virtual bool controlDrawsBorder(ControlPart) const { return true; } virtual bool controlDrawsBackground(ControlPart) const { return true; } virtual bool controlDrawsFocusOutline(ControlPart) const { return true; } // Methods for obtaining platform-specific colors. virtual Color selectionColor(ControlPart, ControlState, SelectionPart) const { return Color(); } virtual Color textSearchHighlightColor() const { return Color(); } // CSS system colors and fonts virtual Color systemColor(ThemeColor) const { return Color(); } virtual Font systemFont(ThemeFont, FontDescription&) const { return Font(); } // How fast the caret blinks in text fields. virtual double caretBlinkInterval() const { return 0.5; } // Notification when the theme has changed virtual void themeChanged() { } // Methods used to adjust the RenderStyles of controls. // The font description result should have a zoomed font size. virtual FontDescription controlFont(ControlPart, const Font& font, float /*zoomFactor*/) const { return font.fontDescription(); } // The size here is in zoomed coordinates already. If a new size is returned, it also needs to be in zoomed coordinates. virtual LengthSize controlSize(ControlPart, const Font&, const LengthSize& zoomedSize, float /*zoomFactor*/) const { return zoomedSize; } // Returns the minimum size for a control in zoomed coordinates. virtual LengthSize minimumControlSize(ControlPart, const Font&, float /*zoomFactor*/) const { return LengthSize(Length(0, Fixed), Length(0, Fixed)); } // Allows the theme to modify the existing padding/border. virtual LengthBox controlPadding(ControlPart, const Font&, const LengthBox& zoomedBox, float zoomFactor) const; virtual LengthBox controlBorder(ControlPart, const Font&, const LengthBox& zoomedBox, float zoomFactor) const; // Whether or not whitespace: pre should be forced on always. virtual bool controlRequiresPreWhiteSpace(ControlPart) const { return false; } // Method for painting a control. The rect is in zoomed coordinates. virtual void paint(ControlPart, ControlStates, GraphicsContext*, const IntRect& /*zoomedRect*/, float /*zoomFactor*/, ScrollView*) const { } // Some controls may spill out of their containers (e.g., the check on an OS X checkbox). When these controls repaint, // the theme needs to communicate this inflated rect to the engine so that it can invalidate the whole control. // The rect passed in is in zoomed coordinates, so the inflation should take that into account and make sure the inflation // amount is also scaled by the zoomFactor. virtual void inflateControlPaintRect(ControlPart, ControlStates, IntRect& /*zoomedRect*/, float /*zoomFactor*/) const { } // This method is called once, from RenderTheme::adjustDefaultStyleSheet(), to let each platform adjust // the default CSS rules in html.css. static String defaultStyleSheet(); private: mutable Color m_activeSelectionColor; mutable Color m_inactiveSelectionColor; }; // Function to obtain the theme. This is implemented in the platform-specific subclasses. Theme* platformTheme(); } // namespace WebCore #endif // Theme_h