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 ScrollbarTheme_h |
27 | #define ScrollbarTheme_h |
28 | |
29 | #include "GraphicsContext.h" |
30 | #include "IntRect.h" |
31 | #include "ScrollTypes.h" |
32 | |
33 | namespace WebCore { |
34 | |
35 | class PlatformMouseEvent; |
36 | class Scrollbar; |
37 | class ScrollView; |
38 | |
39 | #if ENABLE(RUBBER_BANDING) |
40 | class GraphicsLayer; |
41 | #endif |
42 | |
43 | class ScrollbarTheme { |
44 | WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED; |
45 | public: |
46 | ScrollbarTheme() = default; |
47 | virtual ~ScrollbarTheme() {}; |
48 | |
49 | virtual void updateEnabledState(Scrollbar&) { } |
50 | |
51 | virtual bool paint(Scrollbar&, GraphicsContext&, const IntRect& /*damageRect*/) { return false; } |
52 | virtual ScrollbarPart hitTest(Scrollbar&, const IntPoint&) { return NoPart; } |
53 | |
54 | virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar, ScrollbarExpansionState = ScrollbarExpansionState::Expanded) { return 0; } |
55 | |
56 | virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; } |
57 | |
58 | virtual bool supportsControlTints() const { return false; } |
59 | virtual bool usesOverlayScrollbars() const { return false; } |
60 | virtual void usesOverlayScrollbarsChanged() { } |
61 | virtual void updateScrollbarOverlayStyle(Scrollbar&) { } |
62 | |
63 | virtual void themeChanged() {} |
64 | |
65 | virtual bool invalidateOnMouseEnterExit() { return false; } |
66 | |
67 | void invalidateParts(Scrollbar& scrollbar, ScrollbarControlPartMask mask) |
68 | { |
69 | if (mask & BackButtonStartPart) |
70 | invalidatePart(scrollbar, BackButtonStartPart); |
71 | if (mask & ForwardButtonStartPart) |
72 | invalidatePart(scrollbar, ForwardButtonStartPart); |
73 | if (mask & BackTrackPart) |
74 | invalidatePart(scrollbar, BackTrackPart); |
75 | if (mask & ThumbPart) |
76 | invalidatePart(scrollbar, ThumbPart); |
77 | if (mask & ForwardTrackPart) |
78 | invalidatePart(scrollbar, ForwardTrackPart); |
79 | if (mask & BackButtonEndPart) |
80 | invalidatePart(scrollbar, BackButtonEndPart); |
81 | if (mask & ForwardButtonEndPart) |
82 | invalidatePart(scrollbar, ForwardButtonEndPart); |
83 | } |
84 | |
85 | virtual void invalidatePart(Scrollbar&, ScrollbarPart) { } |
86 | |
87 | virtual void paintScrollCorner(GraphicsContext& context, const IntRect& cornerRect) { defaultPaintScrollCorner(context, cornerRect); } |
88 | static void defaultPaintScrollCorner(GraphicsContext& context, const IntRect& cornerRect) { context.fillRect(cornerRect, Color::white); } |
89 | |
90 | virtual void paintTickmarks(GraphicsContext&, Scrollbar&, const IntRect&) { } |
91 | virtual void paintOverhangAreas(ScrollView&, GraphicsContext&, const IntRect&, const IntRect&, const IntRect&) { } |
92 | |
93 | #if ENABLE(RUBBER_BANDING) |
94 | virtual void setUpOverhangAreasLayerContents(GraphicsLayer*, const Color&) { } |
95 | virtual void setUpContentShadowLayer(GraphicsLayer*) { } |
96 | #endif |
97 | |
98 | virtual ScrollbarButtonPressAction handleMousePressEvent(Scrollbar&, const PlatformMouseEvent&, ScrollbarPart); |
99 | virtual bool shouldSnapBackToDragOrigin(Scrollbar&, const PlatformMouseEvent&) { return false; } |
100 | virtual bool shouldDragDocumentInsteadOfThumb(Scrollbar&, const PlatformMouseEvent&) { return false; } |
101 | virtual int thumbPosition(Scrollbar&) { return 0; } // The position of the thumb relative to the track. |
102 | virtual int thumbLength(Scrollbar&) { return 0; } // The length of the thumb along the axis of the scrollbar. |
103 | virtual int trackPosition(Scrollbar&) { return 0; } // The position of the track relative to the scrollbar. |
104 | virtual int trackLength(Scrollbar&) { return 0; } // The length of the track along the axis of the scrollbar. |
105 | |
106 | virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); } |
107 | |
108 | virtual Seconds initialAutoscrollTimerDelay() { return 250_ms; } |
109 | virtual Seconds autoscrollTimerDelay() { return 50_ms; } |
110 | |
111 | virtual void registerScrollbar(Scrollbar&) { } |
112 | virtual void unregisterScrollbar(Scrollbar&) { } |
113 | |
114 | virtual bool isMockTheme() const { return false; } |
115 | |
116 | WEBCORE_EXPORT static ScrollbarTheme& theme(); |
117 | |
118 | private: |
119 | static ScrollbarTheme& nativeTheme(); // Must be implemented to return the correct theme subclass. |
120 | }; |
121 | |
122 | } |
123 | #endif |
124 | |