third_party/WebKit/public/platform/WebFallbackThemeEngine.h

   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         // LayoutTheme 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