external/webkit r30707

1 files changed, 216 insertions, 0 deletions

diff --git a/WebCore/rendering/RenderTheme.h b/WebCore/rendering/RenderTheme.h
new file mode 100644
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--- /dev/null
+++ b/WebCore/rendering/RenderTheme.h
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+/*
+ * This file is part of the theme implementation for form controls in WebCore.
+ *
+ * Copyright (C) 2005, 2006, 2007, 2008 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
+ * 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., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef RenderTheme_h
+#define RenderTheme_h
+
+#include "RenderObject.h"
+
+namespace WebCore {
+
+class Element;
+class PopupMenu;
+class RenderMenuList;
+
+enum ControlState {
+    HoverState,
+    PressedState,
+    FocusState,
+    EnabledState,
+    CheckedState,
+    ReadOnlyState
+};
+
+class RenderTheme {
+public:
+    RenderTheme() { }
+    virtual ~RenderTheme() { }
+
+    // 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(CSSStyleSelector*, RenderStyle*, Element*,  bool UAHasAppearance,
+                     const BorderData&, const BackgroundLayer&, const Color& backgroundColor);
+
+    // This method is called to paint the widget as a background of the RenderObject.  A widget's foreground, e.g., the
+    // text of a button, is always rendered by the engine itself.  The boolean return value indicates
+    // whether the CSS border/background should also be painted.
+    bool paint(RenderObject*, const RenderObject::PaintInfo&, const IntRect&);
+    bool paintBorderOnly(RenderObject*, const RenderObject::PaintInfo&, const IntRect&);
+    bool paintDecorations(RenderObject*, const RenderObject::PaintInfo&, const IntRect&);
+
+    // The remaining methods should be implemented by the platform-specific portion of the theme, e.g.,
+    // RenderThemeMac.cpp for Mac OS X.
+
+    // 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 short baselinePosition(const RenderObject*) 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).
+    virtual bool isControlContainer(EAppearance) const;
+
+    // A method asking if the control changes its tint when the window has focus or not.
+    virtual bool controlSupportsTints(const RenderObject*) const { return false; }
+
+    // Whether or not the control has been styled enough by the author to disable the native appearance.
+    virtual bool isControlStyled(const RenderStyle*, const BorderData&, const BackgroundLayer&, const Color& backgroundColor) const;
+
+    // A general method asking if any control tinting is supported at all.
+    virtual bool supportsControlTints() const { return false; }
+
+    // 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.
+    virtual void adjustRepaintRect(const RenderObject*, IntRect&) { }
+
+    // This method is called whenever a relevant state changes on a particular themed object, e.g., the mouse becomes pressed
+    // or a control becomes disabled.
+    virtual bool stateChanged(RenderObject*, ControlState) const;
+
+    // This method is called whenever the theme changes on the system in order to flush cached resources from the
+    // old theme.
+    virtual void themeChanged() { }
+
+    // A method asking if the theme is able to draw the focus ring.
+    virtual bool supportsFocusRing(const RenderStyle*) const;
+
+    // A method asking if the theme's controls actually care about redrawing when hovered.
+    virtual bool supportsHover(const RenderStyle*) const { return false; }
+
+    // The selection color.
+    Color activeSelectionBackgroundColor() const;
+    Color inactiveSelectionBackgroundColor() const;
+
+    virtual Color platformTextSearchHighlightColor() const;
+
+    // The platform selection color.
+    virtual Color platformActiveSelectionBackgroundColor() const;
+    virtual Color platformInactiveSelectionBackgroundColor() const;
+    virtual Color platformActiveSelectionForegroundColor() const;
+    virtual Color platformInactiveSelectionForegroundColor() const;
+
+    // List Box selection color
+    virtual Color activeListBoxSelectionBackgroundColor() const;
+    virtual Color activeListBoxSelectionForegroundColor() const;
+    virtual Color inactiveListBoxSelectionBackgroundColor() const;
+    virtual Color inactiveListBoxSelectionForegroundColor() const;
+
+    virtual void platformColorsDidChange();
+
+    virtual double caretBlinkFrequency() const { return 0.5; }
+
+    // System fonts and colors for CSS.
+    virtual void systemFont(int cssValueId, FontDescription&) const = 0;
+    virtual Color systemColor(int cssValueId) const;
+
+    virtual int minimumMenuListSize(RenderStyle*) const { return 0; }
+
+    virtual void adjustSliderThumbSize(RenderObject*) const;
+
+    // Methods for state querying
+    bool isActive(const RenderObject*) const;
+    bool isChecked(const RenderObject*) const;
+    bool isIndeterminate(const RenderObject*) const;
+    bool isEnabled(const RenderObject*) const;
+    bool isFocused(const RenderObject*) const;
+    bool isPressed(const RenderObject*) const;
+    bool isHovered(const RenderObject*) const;
+    bool isReadOnlyControl(const RenderObject*) const;
+    
+    virtual int popupInternalPaddingLeft(RenderStyle*) const { return 0; }
+    virtual int popupInternalPaddingRight(RenderStyle*) const { return 0; }
+    virtual int popupInternalPaddingTop(RenderStyle*) const { return 0; }
+    virtual int popupInternalPaddingBottom(RenderStyle*) const { return 0; }
+    
+    // Method for painting the caps lock indicator
+    virtual bool paintCapsLockIndicator(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return 0; };
+
+protected:
+    // Methods for each appearance value.
+    virtual void adjustCheckboxStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintCheckbox(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual void setCheckboxSize(RenderStyle*) const { }
+
+    virtual void adjustRadioStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintRadio(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual void setRadioSize(RenderStyle*) const { }
+
+    virtual void adjustButtonStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual void setButtonSize(RenderStyle*) const { }
+
+    virtual void adjustTextFieldStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintTextField(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustTextAreaStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintTextArea(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustMenuListStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintMenuList(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustMenuListButtonStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintMenuListButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustSliderTrackStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintSliderTrack(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustSliderThumbStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintSliderThumb(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustSearchFieldStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintSearchField(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustSearchFieldCancelButtonStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintSearchFieldCancelButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustSearchFieldDecorationStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintSearchFieldDecoration(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustSearchFieldResultsDecorationStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintSearchFieldResultsDecoration(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual void adjustSearchFieldResultsButtonStyle(CSSStyleSelector*, RenderStyle*, Element*) const;
+    virtual bool paintSearchFieldResultsButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+    virtual bool paintMediaFullscreenButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual bool paintMediaPlayButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual bool paintMediaMuteButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual bool paintMediaSeekBackButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual bool paintMediaSeekForwardButton(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual bool paintMediaSliderTrack(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+    virtual bool paintMediaSliderThumb(RenderObject*, const RenderObject::PaintInfo&, const IntRect&) { return true; }
+
+private:
+    mutable Color m_activeSelectionColor;
+    mutable Color m_inactiveSelectionColor;
+};
+
+// Function to obtain the theme.  This is implemented in your platform-specific theme implementation to hand
+// back the appropriate platform theme.
+RenderTheme* theme();
+
+} // namespace WebCore
+
+#endif // RenderTheme_h