| /* |
| * Copyright (C) 2008 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "third_party/blink/renderer/core/paint/custom_scrollbar_theme.h" |
| |
| #include "third_party/blink/renderer/core/layout/custom_scrollbar.h" |
| #include "third_party/blink/renderer/core/layout/layout_custom_scrollbar_part.h" |
| #include "third_party/blink/renderer/core/paint/object_painter.h" |
| #include "third_party/blink/renderer/core/paint/paint_info.h" |
| #include "third_party/blink/renderer/core/scroll/scrollbar.h" |
| #include "third_party/blink/renderer/platform/graphics/graphics_context.h" |
| #include "third_party/blink/renderer/platform/graphics/paint/drawing_recorder.h" |
| #include "third_party/blink/renderer/platform/wtf/std_lib_extras.h" |
| |
| namespace blink { |
| |
| CustomScrollbarTheme* CustomScrollbarTheme::GetCustomScrollbarTheme() { |
| DEFINE_STATIC_LOCAL(CustomScrollbarTheme, theme, ()); |
| return &theme; |
| } |
| |
| ScrollbarPart CustomScrollbarTheme::HitTest(const Scrollbar& scrollbar, |
| const IntPoint& test_position) { |
| auto result = ScrollbarTheme::HitTest(scrollbar, test_position); |
| if (result == kScrollbarBGPart) { |
| // The ScrollbarTheme knows nothing about the double buttons. |
| if (ButtonRect(scrollbar, kBackButtonEndPart).Contains(test_position)) |
| return kBackButtonEndPart; |
| if (ButtonRect(scrollbar, kForwardButtonStartPart).Contains(test_position)) |
| return kForwardButtonStartPart; |
| } |
| return result; |
| } |
| |
| void CustomScrollbarTheme::ButtonSizesAlongTrackAxis(const Scrollbar& scrollbar, |
| int& before_size, |
| int& after_size) { |
| IntRect first_button = ButtonRect(scrollbar, kBackButtonStartPart); |
| IntRect second_button = ButtonRect(scrollbar, kForwardButtonStartPart); |
| IntRect third_button = ButtonRect(scrollbar, kBackButtonEndPart); |
| IntRect fourth_button = ButtonRect(scrollbar, kForwardButtonEndPart); |
| if (scrollbar.Orientation() == kHorizontalScrollbar) { |
| before_size = first_button.Width() + second_button.Width(); |
| after_size = third_button.Width() + fourth_button.Width(); |
| } else { |
| before_size = first_button.Height() + second_button.Height(); |
| after_size = third_button.Height() + fourth_button.Height(); |
| } |
| } |
| |
| bool CustomScrollbarTheme::HasButtons(const Scrollbar& scrollbar) { |
| int start_size; |
| int end_size; |
| ButtonSizesAlongTrackAxis(scrollbar, start_size, end_size); |
| return (start_size + end_size) <= |
| (scrollbar.Orientation() == kHorizontalScrollbar ? scrollbar.Width() |
| : scrollbar.Height()); |
| } |
| |
| bool CustomScrollbarTheme::HasThumb(const Scrollbar& scrollbar) { |
| return TrackLength(scrollbar) - ThumbLength(scrollbar) >= 0; |
| } |
| |
| int CustomScrollbarTheme::MinimumThumbLength(const Scrollbar& scrollbar) { |
| return To<CustomScrollbar>(scrollbar).MinimumThumbLength(); |
| } |
| |
| IntRect CustomScrollbarTheme::ButtonRect(const Scrollbar& scrollbar, |
| ScrollbarPart part_type) { |
| return To<CustomScrollbar>(scrollbar).ButtonRect(part_type); |
| } |
| |
| IntRect CustomScrollbarTheme::BackButtonRect(const Scrollbar& scrollbar) { |
| return ButtonRect(scrollbar, kBackButtonStartPart); |
| } |
| |
| IntRect CustomScrollbarTheme::ForwardButtonRect(const Scrollbar& scrollbar) { |
| return ButtonRect(scrollbar, kForwardButtonEndPart); |
| } |
| |
| IntRect CustomScrollbarTheme::TrackRect(const Scrollbar& scrollbar) { |
| if (!HasButtons(scrollbar)) |
| return scrollbar.FrameRect(); |
| |
| int start_length; |
| int end_length; |
| ButtonSizesAlongTrackAxis(scrollbar, start_length, end_length); |
| |
| return To<CustomScrollbar>(scrollbar).TrackRect(start_length, end_length); |
| } |
| |
| IntRect CustomScrollbarTheme::ConstrainTrackRectToTrackPieces( |
| const Scrollbar& scrollbar, |
| const IntRect& rect) { |
| IntRect back_rect = To<CustomScrollbar>(scrollbar).TrackPieceRectWithMargins( |
| kBackTrackPart, rect); |
| IntRect forward_rect = |
| To<CustomScrollbar>(scrollbar).TrackPieceRectWithMargins( |
| kForwardTrackPart, rect); |
| IntRect result = rect; |
| if (scrollbar.Orientation() == kHorizontalScrollbar) { |
| result.SetX(back_rect.X()); |
| result.SetWidth(forward_rect.MaxX() - back_rect.X()); |
| } else { |
| result.SetY(back_rect.Y()); |
| result.SetHeight(forward_rect.MaxY() - back_rect.Y()); |
| } |
| return result; |
| } |
| |
| void CustomScrollbarTheme::PaintScrollCorner( |
| GraphicsContext& context, |
| const Scrollbar* vertical_scrollbar, |
| const DisplayItemClient& display_item_client, |
| const IntRect& corner_rect, |
| WebColorScheme color_scheme) { |
| if (DrawingRecorder::UseCachedDrawingIfPossible(context, display_item_client, |
| DisplayItem::kScrollCorner)) |
| return; |
| |
| DrawingRecorder recorder(context, display_item_client, |
| DisplayItem::kScrollCorner, corner_rect); |
| // FIXME: Implement. |
| context.FillRect(corner_rect, Color::kWhite); |
| } |
| |
| void CustomScrollbarTheme::PaintTrackAndButtons(GraphicsContext& context, |
| const Scrollbar& scrollbar, |
| const IntPoint& offset) { |
| // Custom scrollbars are always painted in their original coordinate space, |
| // i.e. the space of Scrollbar::FrameRect() and ScrollbarTheme::XXXRect() |
| // which is |context|'s current space. |
| DCHECK_EQ(offset, IntPoint()); |
| |
| PaintPart(context, scrollbar, scrollbar.FrameRect(), kScrollbarBGPart); |
| |
| if (HasButtons(scrollbar)) { |
| PaintButton(context, scrollbar, ButtonRect(scrollbar, kBackButtonStartPart), |
| kBackButtonStartPart); |
| PaintButton(context, scrollbar, ButtonRect(scrollbar, kBackButtonEndPart), |
| kBackButtonEndPart); |
| PaintButton(context, scrollbar, |
| ButtonRect(scrollbar, kForwardButtonStartPart), |
| kForwardButtonStartPart); |
| PaintButton(context, scrollbar, |
| ButtonRect(scrollbar, kForwardButtonEndPart), |
| kForwardButtonEndPart); |
| } |
| |
| IntRect track_rect = TrackRect(scrollbar); |
| PaintPart(context, scrollbar, track_rect, kTrackBGPart); |
| |
| if (HasThumb(scrollbar)) { |
| IntRect start_track_rect; |
| IntRect thumb_rect; |
| IntRect end_track_rect; |
| SplitTrack(scrollbar, track_rect, start_track_rect, thumb_rect, |
| end_track_rect); |
| PaintPart(context, scrollbar, start_track_rect, kBackTrackPart); |
| PaintPart(context, scrollbar, end_track_rect, kForwardTrackPart); |
| } |
| } |
| |
| void CustomScrollbarTheme::PaintButton(GraphicsContext& context, |
| const Scrollbar& scrollbar, |
| const IntRect& rect, |
| ScrollbarPart part) { |
| PaintPart(context, scrollbar, rect, part); |
| } |
| |
| void CustomScrollbarTheme::PaintThumb(GraphicsContext& context, |
| const Scrollbar& scrollbar, |
| const IntRect& rect) { |
| PaintPart(context, scrollbar, rect, kThumbPart); |
| } |
| |
| void CustomScrollbarTheme::PaintTickmarks(GraphicsContext& context, |
| const Scrollbar& scrollbar, |
| const IntRect& rect) { |
| GetTheme().PaintTickmarks(context, scrollbar, rect); |
| } |
| |
| void CustomScrollbarTheme::PaintIntoRect( |
| const LayoutCustomScrollbarPart& layout_custom_scrollbar_part, |
| GraphicsContext& graphics_context, |
| const PhysicalRect& rect) { |
| PaintInfo paint_info(graphics_context, PixelSnappedIntRect(rect), |
| PaintPhase::kForeground, kGlobalPaintNormalPhase, |
| kPaintLayerNoFlag); |
| ObjectPainter(layout_custom_scrollbar_part) |
| .PaintAllPhasesAtomically(paint_info); |
| } |
| |
| void CustomScrollbarTheme::PaintPart(GraphicsContext& context, |
| const Scrollbar& scrollbar, |
| const IntRect& rect, |
| ScrollbarPart part) { |
| const auto& custom_scrollbar = To<CustomScrollbar>(scrollbar); |
| const auto* part_layout_object = custom_scrollbar.GetPart(part); |
| if (!part_layout_object) |
| return; |
| PaintIntoRect(*part_layout_object, context, PhysicalRect(rect)); |
| } |
| |
| } // namespace blink |
