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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
      3  * Copyright (C) 2008, 2009 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "platform/scroll/ScrollbarThemeNonMacCommon.h"
     29 
     30 #include "platform/PlatformMouseEvent.h"
     31 #include "platform/graphics/GraphicsContextStateSaver.h"
     32 #include "platform/scroll/ScrollableArea.h"
     33 #include "platform/scroll/ScrollbarThemeClient.h"
     34 
     35 namespace WebCore {
     36 
     37 bool ScrollbarThemeNonMacCommon::hasThumb(ScrollbarThemeClient* scrollbar)
     38 {
     39     // This method is just called as a paint-time optimization to see if
     40     // painting the thumb can be skipped. We don't have to be exact here.
     41     return thumbLength(scrollbar) > 0;
     42 }
     43 
     44 IntRect ScrollbarThemeNonMacCommon::backButtonRect(ScrollbarThemeClient* scrollbar, ScrollbarPart part, bool)
     45 {
     46     // Windows and Linux just have single arrows.
     47     if (part == BackButtonEndPart)
     48         return IntRect();
     49 
     50     IntSize size = buttonSize(scrollbar);
     51     return IntRect(scrollbar->x(), scrollbar->y(), size.width(), size.height());
     52 }
     53 
     54 IntRect ScrollbarThemeNonMacCommon::forwardButtonRect(ScrollbarThemeClient* scrollbar, ScrollbarPart part, bool)
     55 {
     56     // Windows and Linux just have single arrows.
     57     if (part == ForwardButtonStartPart)
     58         return IntRect();
     59 
     60     IntSize size = buttonSize(scrollbar);
     61     int x, y;
     62     if (scrollbar->orientation() == HorizontalScrollbar) {
     63         x = scrollbar->x() + scrollbar->width() - size.width();
     64         y = scrollbar->y();
     65     } else {
     66         x = scrollbar->x();
     67         y = scrollbar->y() + scrollbar->height() - size.height();
     68     }
     69     return IntRect(x, y, size.width(), size.height());
     70 }
     71 
     72 IntRect ScrollbarThemeNonMacCommon::trackRect(ScrollbarThemeClient* scrollbar, bool)
     73 {
     74     IntSize bs = buttonSize(scrollbar);
     75     int thickness = scrollbarThickness(scrollbar->controlSize());
     76     if (scrollbar->orientation() == HorizontalScrollbar) {
     77         // Once the scrollbar becomes smaller than the size of the
     78         // two buttons with a 1 pixel gap, the track disappears.
     79         if (scrollbar->width() <= 2 * bs.width() + 1)
     80             return IntRect();
     81         return IntRect(scrollbar->x() + bs.width(), scrollbar->y(), scrollbar->width() - 2 * bs.width(), thickness);
     82     }
     83     if (scrollbar->height() <= 2 * bs.height() + 1)
     84         return IntRect();
     85     return IntRect(scrollbar->x(), scrollbar->y() + bs.height(), thickness, scrollbar->height() - 2 * bs.height());
     86 }
     87 
     88 void ScrollbarThemeNonMacCommon::paintTrackBackground(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
     89 {
     90     // Just assume a forward track part. We only paint the track as a single piece when there is no thumb.
     91     if (!hasThumb(scrollbar))
     92         paintTrackPiece(context, scrollbar, rect, ForwardTrackPart);
     93 }
     94 
     95 void ScrollbarThemeNonMacCommon::paintTickmarks(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
     96 {
     97     if (scrollbar->orientation() != VerticalScrollbar)
     98         return;
     99 
    100     if (rect.height() <= 0 || rect.width() <= 0)
    101         return;
    102 
    103     // Get the tickmarks for the frameview.
    104     Vector<IntRect> tickmarks;
    105     scrollbar->getTickmarks(tickmarks);
    106     if (!tickmarks.size())
    107         return;
    108 
    109     GraphicsContextStateSaver stateSaver(*context);
    110     context->setShouldAntialias(false);
    111 
    112     for (Vector<IntRect>::const_iterator i = tickmarks.begin(); i != tickmarks.end(); ++i) {
    113         // Calculate how far down (in %) the tick-mark should appear.
    114         const float percent = static_cast<float>(i->y()) / scrollbar->totalSize();
    115 
    116         // Calculate how far down (in pixels) the tick-mark should appear.
    117         const int yPos = rect.y() + (rect.height() * percent);
    118 
    119         context->setFillColor(Color(0xCC, 0xAA, 0x00, 0xFF));
    120         FloatRect tickRect(rect.x(), yPos, rect.width(), 3);
    121         context->fillRect(tickRect);
    122 
    123         context->setFillColor(Color(0xFF, 0xDD, 0x00, 0xFF));
    124         FloatRect tickStroke(rect.x(), yPos + 1, rect.width(), 1);
    125         context->fillRect(tickStroke);
    126     }
    127 }
    128 
    129 } // namespace WebCore
    130