| /* |
| * 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 "platform/LengthBox.h" |
| #include "platform/LengthSize.h" |
| #include "platform/PlatformExport.h" |
| #include "platform/ThemeTypes.h" |
| #include "platform/fonts/FontDescription.h" |
| #include "platform/geometry/IntRect.h" |
| #include "platform/graphics/Color.h" |
| #include "wtf/Allocator.h" |
| #include "wtf/Forward.h" |
| #include "wtf/Noncopyable.h" |
| |
| namespace blink { |
| |
| class GraphicsContext; |
| class ScrollableArea; |
| |
| // Unlike other platform classes, Theme does extensively use virtual functions. |
| // This design allows a platform to switch between multiple themes at runtime. |
| class PLATFORM_EXPORT Theme { |
| USING_FAST_MALLOC(Theme); |
| WTF_MAKE_NONCOPYABLE(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 LayoutTheme::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(); } |
| |
| // How fast the caret blinks in text fields. |
| virtual double caretBlinkInterval() const { return 0.5; } |
| |
| // Methods used to adjust the ComputedStyles of controls. |
| |
| // The font description result should have a zoomed font size. |
| virtual FontDescription controlFont(ControlPart, |
| const FontDescription& fontDescription, |
| float /*zoomFactor*/) const { |
| return 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 FontDescription&, |
| const LengthSize& zoomedSize, |
| float /*zoomFactor*/) const { |
| return zoomedSize; |
| } |
| |
| // Returns the minimum size for a control in zoomed coordinates. |
| virtual LengthSize minimumControlSize(ControlPart, |
| const FontDescription&, |
| 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 FontDescription&, |
| const LengthBox& zoomedBox, |
| float zoomFactor) const; |
| virtual LengthBox controlBorder(ControlPart, |
| const FontDescription&, |
| 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*/, |
| ScrollableArea*) const {} |
| |
| // Add visual overflow (e.g., the check on an OS X checkbox). 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 addVisualOverflow(ControlPart, |
| ControlStates, |
| float zoomFactor, |
| IntRect& borderBox) const {} |
| |
| private: |
| mutable Color m_activeSelectionColor; |
| mutable Color m_inactiveSelectionColor; |
| }; |
| |
| PLATFORM_EXPORT Theme* platformTheme(); |
| |
| } // namespace blink |
| |
| #endif // Theme_h |