1/*
2 * Copyright (C) 2010 Google 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef WebThemeEngine_h
32#define WebThemeEngine_h
33
34#include "../WebCanvas.h"
35#include "../WebColor.h"
36#include "../WebSize.h"
37
38namespace blink {
39
40struct WebRect;
41
42class WebThemeEngine {
43public:
44    // The UI part which is being accessed.
45    enum Part {
46        // ScrollbarTheme parts
47        PartScrollbarDownArrow,
48        PartScrollbarLeftArrow,
49        PartScrollbarRightArrow,
50        PartScrollbarUpArrow,
51        PartScrollbarHorizontalThumb,
52        PartScrollbarVerticalThumb,
53        PartScrollbarHorizontalTrack,
54        PartScrollbarVerticalTrack,
55
56        // RenderTheme parts
57        PartCheckbox,
58        PartRadio,
59        PartButton,
60        PartTextField,
61        PartMenuList,
62        PartSliderTrack,
63        PartSliderThumb,
64        PartInnerSpinButton,
65        PartProgressBar
66    };
67
68    // The current state of the associated Part.
69    enum State {
70        StateDisabled,
71        StateHover,
72        StateNormal,
73        StatePressed,
74        StateFocused,
75        StateReadonly,
76    };
77
78    // Extra parameters for drawing the PartScrollbarHorizontalTrack and
79    // PartScrollbarVerticalTrack.
80    struct ScrollbarTrackExtraParams {
81        bool isBack; // Whether this is the 'back' part or the 'forward' part.
82
83        // The bounds of the entire track, as opposed to the part being painted.
84        int trackX;
85        int trackY;
86        int trackWidth;
87        int trackHeight;
88    };
89
90    // Extra parameters for PartCheckbox, PartPushButton and PartRadio.
91    struct ButtonExtraParams {
92        bool checked;
93        bool indeterminate; // Whether the button state is indeterminate.
94        bool isDefault; // Whether the button is default button.
95        bool hasBorder;
96        WebColor backgroundColor;
97    };
98
99    // Extra parameters for PartTextField
100    struct TextFieldExtraParams {
101        bool isTextArea;
102        bool isListbox;
103        WebColor backgroundColor;
104    };
105
106    // Extra parameters for PartMenuList
107    struct MenuListExtraParams {
108        bool hasBorder;
109        bool hasBorderRadius;
110        int arrowX;
111        int arrowY;
112        int arrowHeight;
113        WebColor backgroundColor;
114        bool fillContentArea;
115    };
116
117    // Extra parameters for PartSliderTrack and PartSliderThumb
118    struct SliderExtraParams {
119        bool vertical;
120        bool inDrag;
121    };
122
123    // Extra parameters for PartInnerSpinButton
124    struct InnerSpinButtonExtraParams {
125        bool spinUp;
126        bool readOnly;
127    };
128
129    // Extra parameters for PartProgressBar
130    struct ProgressBarExtraParams {
131        bool determinate;
132        int valueRectX;
133        int valueRectY;
134        int valueRectWidth;
135        int valueRectHeight;
136    };
137
138    union ExtraParams {
139        ScrollbarTrackExtraParams scrollbarTrack;
140        ButtonExtraParams button;
141        TextFieldExtraParams textField;
142        MenuListExtraParams menuList;
143        SliderExtraParams slider;
144        InnerSpinButtonExtraParams innerSpin;
145        ProgressBarExtraParams progressBar;
146    };
147
148    // Gets the size of the given theme part. For variable sized items
149    // like vertical scrollbar thumbs, the width will be the required width of
150    // the track while the height will be the minimum height.
151    virtual WebSize getSize(Part) { return WebSize(); }
152    // Paint the given the given theme part.
153    virtual void paint(WebCanvas*, Part, State, const WebRect&, const ExtraParams*) { }
154};
155
156} // namespace blink
157
158#endif
159