1 /* 2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef Theme_h 27 #define Theme_h 28 29 #include "core/platform/LengthBox.h" 30 #include "core/platform/LengthSize.h" 31 #include "core/platform/ThemeTypes.h" 32 #include "core/platform/graphics/Color.h" 33 #include "core/platform/graphics/Font.h" 34 #include "core/platform/graphics/IntRect.h" 35 #include "wtf/Forward.h" 36 37 namespace WebCore { 38 39 class GraphicsContext; 40 class ScrollView; 41 42 // Unlike other platform classes, Theme does extensively use virtual functions. This design allows a platform to switch between multiple themes at runtime. 43 class Theme { 44 public: 45 Theme() { } 46 virtual ~Theme() { } 47 48 // A method to obtain the baseline position adjustment for a "leaf" control. This will only be used if a baseline 49 // position cannot be determined by examining child content. Checkboxes and radio buttons are examples of 50 // controls that need to do this. The adjustment is an offset that adds to the baseline, e.g., marginTop() + height() + |offset|. 51 // The offset is not zoomed. 52 virtual int baselinePositionAdjustment(ControlPart) const { return 0; } 53 54 // A method asking if the control changes its appearance when the window is inactive. 55 virtual bool controlHasInactiveAppearance(ControlPart) const { return false; } 56 57 // General methods for whether or not any of the controls in the theme change appearance when the window is inactive or 58 // when hovered over. 59 virtual bool controlsCanHaveInactiveAppearance() const { return false; } 60 virtual bool controlsCanHaveHoveredAppearance() const { return false; } 61 62 // Used by RenderTheme::isControlStyled to figure out if the native look and feel should be turned off. 63 virtual bool controlDrawsBorder(ControlPart) const { return true; } 64 virtual bool controlDrawsBackground(ControlPart) const { return true; } 65 virtual bool controlDrawsFocusOutline(ControlPart) const { return true; } 66 67 // Methods for obtaining platform-specific colors. 68 virtual Color selectionColor(ControlPart, ControlState, SelectionPart) const { return Color(); } 69 virtual Color textSearchHighlightColor() const { return Color(); } 70 71 // CSS system colors and fonts 72 virtual Color systemColor(ThemeColor) const { return Color(); } 73 virtual Font systemFont(ThemeFont, FontDescription&) const { return Font(); } 74 75 // How fast the caret blinks in text fields. 76 virtual double caretBlinkInterval() const { return 0.5; } 77 78 // Notification when the theme has changed 79 virtual void themeChanged() { } 80 81 // Methods used to adjust the RenderStyles of controls. 82 83 // The font description result should have a zoomed font size. 84 virtual FontDescription controlFont(ControlPart, const Font& font, float /*zoomFactor*/) const { return font.fontDescription(); } 85 86 // The size here is in zoomed coordinates already. If a new size is returned, it also needs to be in zoomed coordinates. 87 virtual LengthSize controlSize(ControlPart, const Font&, const LengthSize& zoomedSize, float /*zoomFactor*/) const { return zoomedSize; } 88 89 // Returns the minimum size for a control in zoomed coordinates. 90 virtual LengthSize minimumControlSize(ControlPart, const Font&, float /*zoomFactor*/) const { return LengthSize(Length(0, Fixed), Length(0, Fixed)); } 91 92 // Allows the theme to modify the existing padding/border. 93 virtual LengthBox controlPadding(ControlPart, const Font&, const LengthBox& zoomedBox, float zoomFactor) const; 94 virtual LengthBox controlBorder(ControlPart, const Font&, const LengthBox& zoomedBox, float zoomFactor) const; 95 96 // Whether or not whitespace: pre should be forced on always. 97 virtual bool controlRequiresPreWhiteSpace(ControlPart) const { return false; } 98 99 // Method for painting a control. The rect is in zoomed coordinates. 100 virtual void paint(ControlPart, ControlStates, GraphicsContext*, const IntRect& /*zoomedRect*/, float /*zoomFactor*/, ScrollView*) const { } 101 102 // Some controls may spill out of their containers (e.g., the check on an OS X checkbox). When these controls repaint, 103 // the theme needs to communicate this inflated rect to the engine so that it can invalidate the whole control. 104 // The rect passed in is in zoomed coordinates, so the inflation should take that into account and make sure the inflation 105 // amount is also scaled by the zoomFactor. 106 virtual void inflateControlPaintRect(ControlPart, ControlStates, IntRect& /*zoomedRect*/, float /*zoomFactor*/) const { } 107 108 // This method is called once, from RenderTheme::adjustDefaultStyleSheet(), to let each platform adjust 109 // the default CSS rules in html.css. 110 static String defaultStyleSheet(); 111 112 private: 113 mutable Color m_activeSelectionColor; 114 mutable Color m_inactiveSelectionColor; 115 }; 116 117 // Function to obtain the theme. This is implemented in the platform-specific subclasses. 118 Theme* platformTheme(); 119 120 } // namespace WebCore 121 122 #endif // Theme_h 123
