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      1 /*
      2  * Copyright (c) 2008, 2009, 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 #include "config.h"
     32 #include "ScrollbarThemeChromiumLinux.h"
     33 
     34 #include "PlatformBridge.h"
     35 #include "PlatformMouseEvent.h"
     36 #include "Scrollbar.h"
     37 
     38 namespace WebCore {
     39 
     40 ScrollbarTheme* ScrollbarTheme::nativeTheme()
     41 {
     42     static ScrollbarThemeChromiumLinux theme;
     43     return &theme;
     44 }
     45 
     46 int ScrollbarThemeChromiumLinux::scrollbarThickness(ScrollbarControlSize controlSize)
     47 {
     48     // Horiz and Vert scrollbars are the same thickness.
     49     IntSize scrollbarSize = PlatformBridge::getThemePartSize(PlatformBridge::PartScrollbarVerticalTrack);
     50     return scrollbarSize.width();
     51 }
     52 
     53 void ScrollbarThemeChromiumLinux::paintTrackPiece(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart partType)
     54 {
     55     PlatformBridge::ThemePaintState state = scrollbar->hoveredPart() == partType ? PlatformBridge::StateHover : PlatformBridge::StateNormal;
     56     IntRect alignRect = trackRect(scrollbar, false);
     57     PlatformBridge::ThemePaintExtraParams extraParams;
     58     extraParams.scrollbarTrack.trackX = alignRect.x();
     59     extraParams.scrollbarTrack.trackY = alignRect.y();
     60     extraParams.scrollbarTrack.trackWidth = alignRect.width();
     61     extraParams.scrollbarTrack.trackHeight = alignRect.height();
     62     PlatformBridge::paintThemePart(
     63         gc,
     64         scrollbar->orientation() == HorizontalScrollbar ? PlatformBridge::PartScrollbarHorizontalTrack : PlatformBridge::PartScrollbarVerticalTrack,
     65         state,
     66         rect,
     67         &extraParams);
     68 }
     69 
     70 void ScrollbarThemeChromiumLinux::paintButton(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart part)
     71 {
     72     PlatformBridge::ThemePart paintPart;
     73     PlatformBridge::ThemePaintState state = PlatformBridge::StateNormal;
     74     bool checkMin = false;
     75     bool checkMax = false;
     76     if (scrollbar->orientation() == HorizontalScrollbar) {
     77         if (part == BackButtonStartPart) {
     78             paintPart = PlatformBridge::PartScrollbarLeftArrow;
     79             checkMin = true;
     80         } else {
     81             paintPart = PlatformBridge::PartScrollbarRightArrow;
     82             checkMax = true;
     83         }
     84     } else {
     85         if (part == BackButtonStartPart) {
     86             paintPart = PlatformBridge::PartScrollbarUpArrow;
     87             checkMin = true;
     88         } else {
     89             paintPart = PlatformBridge::PartScrollbarDownArrow;
     90             checkMax = true;
     91         }
     92     }
     93     if ((checkMin && (scrollbar->currentPos() <= 0))
     94         || (checkMax && scrollbar->currentPos() == scrollbar->maximum())) {
     95         state = PlatformBridge::StateDisabled;
     96     } else {
     97         if (part == scrollbar->pressedPart())
     98             state = PlatformBridge::StatePressed;
     99         else if (part == scrollbar->hoveredPart())
    100             state = PlatformBridge::StateHover;
    101     }
    102     PlatformBridge::paintThemePart(gc, paintPart, state, rect, 0);
    103 }
    104 
    105 void ScrollbarThemeChromiumLinux::paintThumb(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect)
    106 {
    107     PlatformBridge::ThemePaintState state;
    108 
    109     if (scrollbar->pressedPart() == ThumbPart)
    110         state = PlatformBridge::StatePressed;
    111     else if (scrollbar->hoveredPart() == ThumbPart)
    112         state = PlatformBridge::StateHover;
    113     else
    114         state = PlatformBridge::StateNormal;
    115     PlatformBridge::paintThemePart(
    116         gc,
    117         scrollbar->orientation() == HorizontalScrollbar ? PlatformBridge::PartScrollbarHorizontalThumb : PlatformBridge::PartScrollbarVerticalThumb,
    118         state,
    119         rect,
    120         0);
    121 }
    122 
    123 bool ScrollbarThemeChromiumLinux::shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent& evt)
    124 {
    125     return (evt.shiftKey() && evt.button() == LeftButton) || (evt.button() == MiddleButton);
    126 }
    127 
    128 IntSize ScrollbarThemeChromiumLinux::buttonSize(Scrollbar* scrollbar)
    129 {
    130     if (scrollbar->orientation() == VerticalScrollbar) {
    131         IntSize size = PlatformBridge::getThemePartSize(PlatformBridge::PartScrollbarUpArrow);
    132         return IntSize(size.width(), scrollbar->height() < 2 * size.height() ? scrollbar->height() / 2 : size.height());
    133     }
    134 
    135     // HorizontalScrollbar
    136     IntSize size = PlatformBridge::getThemePartSize(PlatformBridge::PartScrollbarLeftArrow);
    137     return IntSize(scrollbar->width() < 2 * size.width() ? scrollbar->width() / 2 : size.width(), size.height());
    138 }
    139 
    140 int ScrollbarThemeChromiumLinux::minimumThumbLength(Scrollbar* scrollbar)
    141 {
    142     if (scrollbar->orientation() == VerticalScrollbar) {
    143         IntSize size = PlatformBridge::getThemePartSize(PlatformBridge::PartScrollbarVerticalThumb);
    144         return size.height();
    145     }
    146 
    147     IntSize size = PlatformBridge::getThemePartSize(PlatformBridge::PartScrollbarHorizontalThumb);
    148     return size.width();
    149 }
    150 
    151 } // namespace WebCore
    152