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-/*
- * 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