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 WebFallbackThemeEngine_h
32#define WebFallbackThemeEngine_h
33
34#include "WebCanvas.h"
35#include "WebColor.h"
36#include "WebSize.h"
37
38namespace blink {
39
40struct WebRect;
41
42class WebFallbackThemeEngine {
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        PartScrollbarCorner,
56
57        // RenderTheme parts
58        PartCheckbox,
59        PartRadio,
60        PartButton,
61        PartTextField,
62        PartMenuList,
63        PartSliderTrack,
64        PartSliderThumb,
65        PartInnerSpinButton,
66        PartProgressBar
67    };
68
69    // The current state of the associated Part.
70    enum State {
71        StateDisabled,
72        StateHover,
73        StateNormal,
74        StatePressed,
75    };
76
77    // Extra parameters for drawing the PartScrollbarHorizontalTrack and
78    // PartScrollbarVerticalTrack.
79    struct ScrollbarTrackExtraParams {
80        // The bounds of the entire track, as opposed to the part being painted.
81        int trackX;
82        int trackY;
83        int trackWidth;
84        int trackHeight;
85    };
86
87    // Extra parameters for PartCheckbox, PartPushButton and PartRadio.
88    struct ButtonExtraParams {
89        bool checked;
90        bool indeterminate; // Whether the button state is indeterminate.
91        bool isDefault; // Whether the button is default button.
92        bool hasBorder;
93        WebColor backgroundColor;
94    };
95
96    // Extra parameters for PartTextField
97    struct TextFieldExtraParams {
98        bool isTextArea;
99        bool isListbox;
100        WebColor backgroundColor;
101    };
102
103    // Extra parameters for PartMenuList
104    struct MenuListExtraParams {
105        bool hasBorder;
106        bool hasBorderRadius;
107        int arrowX;
108        int arrowY;
109        WebColor backgroundColor;
110    };
111
112    // Extra parameters for PartSliderTrack and PartSliderThumb
113    struct SliderExtraParams {
114        bool vertical;
115        bool inDrag;
116    };
117
118    // Extra parameters for PartInnerSpinButton
119    struct InnerSpinButtonExtraParams {
120        bool spinUp;
121        bool readOnly;
122    };
123
124    // Extra parameters for PartProgressBar
125    struct ProgressBarExtraParams {
126        bool determinate;
127        int valueRectX;
128        int valueRectY;
129        int valueRectWidth;
130        int valueRectHeight;
131    };
132
133    union ExtraParams {
134        ScrollbarTrackExtraParams scrollbarTrack;
135        ButtonExtraParams button;
136        TextFieldExtraParams textField;
137        MenuListExtraParams menuList;
138        SliderExtraParams slider;
139        InnerSpinButtonExtraParams innerSpin;
140        ProgressBarExtraParams progressBar;
141    };
142
143    // Gets the size of the given theme part. For variable sized items
144    // like vertical scrollbar thumbs, the width will be the required width of
145    // the track while the height will be the minimum height.
146    virtual WebSize getSize(Part) { return WebSize(); }
147    // Paint the given the given theme part.
148    virtual void paint(WebCanvas*, Part, State, const WebRect&, const ExtraParams*) { }
149};
150
151} // namespace blink
152
153#endif
154