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