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      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 
     38 namespace blink {
     39 
     40 struct WebRect;
     41 
     42 class WebFallbackThemeEngine {
     43 public:
     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