| /* |
| * Copyright (C) 2011 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 "config.h" |
| #include "platform/scroll/ScrollbarTheme.h" |
| |
| #include "platform/PlatformMouseEvent.h" |
| #include "platform/RuntimeEnabledFeatures.h" |
| #include "platform/graphics/Color.h" |
| #include "platform/graphics/GraphicsContext.h" |
| #include "platform/graphics/paint/CullRect.h" |
| #include "platform/graphics/paint/DrawingDisplayItem.h" |
| #include "platform/graphics/paint/DrawingRecorder.h" |
| #include "platform/graphics/paint/PaintController.h" |
| #include "platform/scroll/ScrollbarThemeClient.h" |
| #include "platform/scroll/ScrollbarThemeMock.h" |
| #include "platform/scroll/ScrollbarThemeOverlayMock.h" |
| #include "public/platform/Platform.h" |
| #include "public/platform/WebPoint.h" |
| #include "public/platform/WebRect.h" |
| #include "public/platform/WebScrollbarBehavior.h" |
| |
| #if !OS(MACOSX) |
| #include "public/platform/WebRect.h" |
| #include "public/platform/WebThemeEngine.h" |
| #endif |
| |
| namespace blink { |
| |
| bool ScrollbarTheme::gMockScrollbarsEnabled = false; |
| |
| static inline bool shouldPaintScrollbarPart(const IntRect& partRect, const CullRect& cullRect) |
| { |
| return (!partRect.isEmpty()) || cullRect.intersectsCullRect(partRect); |
| } |
| |
| bool ScrollbarTheme::paint(const ScrollbarThemeClient* scrollbar, GraphicsContext* graphicsContext, const CullRect& cullRect) |
| { |
| // Create the ScrollbarControlPartMask based on the cullRect |
| ScrollbarControlPartMask scrollMask = NoPart; |
| |
| IntRect backButtonStartPaintRect; |
| IntRect backButtonEndPaintRect; |
| IntRect forwardButtonStartPaintRect; |
| IntRect forwardButtonEndPaintRect; |
| if (hasButtons(scrollbar)) { |
| backButtonStartPaintRect = backButtonRect(scrollbar, BackButtonStartPart, true); |
| if (shouldPaintScrollbarPart(backButtonStartPaintRect, cullRect)) |
| scrollMask |= BackButtonStartPart; |
| backButtonEndPaintRect = backButtonRect(scrollbar, BackButtonEndPart, true); |
| if (shouldPaintScrollbarPart(backButtonEndPaintRect, cullRect)) |
| scrollMask |= BackButtonEndPart; |
| forwardButtonStartPaintRect = forwardButtonRect(scrollbar, ForwardButtonStartPart, true); |
| if (shouldPaintScrollbarPart(forwardButtonStartPaintRect, cullRect)) |
| scrollMask |= ForwardButtonStartPart; |
| forwardButtonEndPaintRect = forwardButtonRect(scrollbar, ForwardButtonEndPart, true); |
| if (shouldPaintScrollbarPart(forwardButtonEndPaintRect, cullRect)) |
| scrollMask |= ForwardButtonEndPart; |
| } |
| |
| IntRect startTrackRect; |
| IntRect thumbRect; |
| IntRect endTrackRect; |
| IntRect trackPaintRect = trackRect(scrollbar, true); |
| scrollMask |= TrackBGPart; |
| bool thumbPresent = hasThumb(scrollbar); |
| if (thumbPresent) { |
| IntRect track = trackRect(scrollbar); |
| splitTrack(scrollbar, track, startTrackRect, thumbRect, endTrackRect); |
| if (shouldPaintScrollbarPart(thumbRect, cullRect)) |
| scrollMask |= ThumbPart; |
| if (shouldPaintScrollbarPart(startTrackRect, cullRect)) |
| scrollMask |= BackTrackPart; |
| if (shouldPaintScrollbarPart(endTrackRect, cullRect)) |
| scrollMask |= ForwardTrackPart; |
| } |
| |
| // Paint the scrollbar background (only used by custom CSS scrollbars). |
| paintScrollbarBackground(graphicsContext, scrollbar); |
| |
| // Paint the back and forward buttons. |
| if (scrollMask & BackButtonStartPart) |
| paintButton(graphicsContext, scrollbar, backButtonStartPaintRect, BackButtonStartPart); |
| if (scrollMask & BackButtonEndPart) |
| paintButton(graphicsContext, scrollbar, backButtonEndPaintRect, BackButtonEndPart); |
| if (scrollMask & ForwardButtonStartPart) |
| paintButton(graphicsContext, scrollbar, forwardButtonStartPaintRect, ForwardButtonStartPart); |
| if (scrollMask & ForwardButtonEndPart) |
| paintButton(graphicsContext, scrollbar, forwardButtonEndPaintRect, ForwardButtonEndPart); |
| |
| if (scrollMask & TrackBGPart) |
| paintTrackBackground(graphicsContext, scrollbar, trackPaintRect); |
| |
| if ((scrollMask & ForwardTrackPart) || (scrollMask & BackTrackPart)) { |
| // Paint the track pieces above and below the thumb. |
| if (scrollMask & BackTrackPart) |
| paintTrackPiece(graphicsContext, scrollbar, startTrackRect, BackTrackPart); |
| if (scrollMask & ForwardTrackPart) |
| paintTrackPiece(graphicsContext, scrollbar, endTrackRect, ForwardTrackPart); |
| |
| paintTickmarks(graphicsContext, scrollbar, trackPaintRect); |
| } |
| |
| // Paint the thumb. |
| if (scrollMask & ThumbPart) |
| paintThumb(graphicsContext, scrollbar, thumbRect); |
| |
| return true; |
| } |
| |
| ScrollbarPart ScrollbarTheme::hitTest(const ScrollbarThemeClient* scrollbar, const IntPoint& position) |
| { |
| ScrollbarPart result = NoPart; |
| if (!scrollbar->enabled()) |
| return result; |
| |
| IntPoint testPosition = scrollbar->convertFromContainingWindow(position); |
| testPosition.move(scrollbar->x(), scrollbar->y()); |
| |
| if (!scrollbar->frameRect().contains(testPosition)) |
| return NoPart; |
| |
| result = ScrollbarBGPart; |
| |
| IntRect track = trackRect(scrollbar); |
| if (track.contains(testPosition)) { |
| IntRect beforeThumbRect; |
| IntRect thumbRect; |
| IntRect afterThumbRect; |
| splitTrack(scrollbar, track, beforeThumbRect, thumbRect, afterThumbRect); |
| if (thumbRect.contains(testPosition)) |
| result = ThumbPart; |
| else if (beforeThumbRect.contains(testPosition)) |
| result = BackTrackPart; |
| else if (afterThumbRect.contains(testPosition)) |
| result = ForwardTrackPart; |
| else |
| result = TrackBGPart; |
| } else if (backButtonRect(scrollbar, BackButtonStartPart).contains(testPosition)) { |
| result = BackButtonStartPart; |
| } else if (backButtonRect(scrollbar, BackButtonEndPart).contains(testPosition)) { |
| result = BackButtonEndPart; |
| } else if (forwardButtonRect(scrollbar, ForwardButtonStartPart).contains(testPosition)) { |
| result = ForwardButtonStartPart; |
| } else if (forwardButtonRect(scrollbar, ForwardButtonEndPart).contains(testPosition)) { |
| result = ForwardButtonEndPart; |
| } |
| return result; |
| } |
| |
| void ScrollbarTheme::invalidatePart(ScrollbarThemeClient* scrollbar, ScrollbarPart part) |
| { |
| if (part == NoPart) |
| return; |
| |
| IntRect result; |
| switch (part) { |
| case BackButtonStartPart: |
| result = backButtonRect(scrollbar, BackButtonStartPart, true); |
| break; |
| case BackButtonEndPart: |
| result = backButtonRect(scrollbar, BackButtonEndPart, true); |
| break; |
| case ForwardButtonStartPart: |
| result = forwardButtonRect(scrollbar, ForwardButtonStartPart, true); |
| break; |
| case ForwardButtonEndPart: |
| result = forwardButtonRect(scrollbar, ForwardButtonEndPart, true); |
| break; |
| case TrackBGPart: |
| result = trackRect(scrollbar, true); |
| break; |
| case ScrollbarBGPart: |
| result = scrollbar->frameRect(); |
| break; |
| default: { |
| IntRect beforeThumbRect, thumbRect, afterThumbRect; |
| splitTrack(scrollbar, trackRect(scrollbar), beforeThumbRect, thumbRect, afterThumbRect); |
| if (part == BackTrackPart) |
| result = beforeThumbRect; |
| else if (part == ForwardTrackPart) |
| result = afterThumbRect; |
| else |
| result = thumbRect; |
| } |
| } |
| result.moveBy(-scrollbar->location()); |
| scrollbar->invalidateRect(result); |
| } |
| |
| void ScrollbarTheme::paintScrollCorner(GraphicsContext* context, const DisplayItemClientWrapper& displayItemClient, const IntRect& cornerRect) |
| { |
| if (cornerRect.isEmpty()) |
| return; |
| |
| if (DrawingRecorder::useCachedDrawingIfPossible(*context, displayItemClient, DisplayItem::ScrollbarCorner)) |
| return; |
| |
| DrawingRecorder recorder(*context, displayItemClient, DisplayItem::ScrollbarCorner, cornerRect); |
| #if OS(MACOSX) |
| context->fillRect(cornerRect, Color::white); |
| #else |
| Platform::current()->themeEngine()->paint(context->canvas(), WebThemeEngine::PartScrollbarCorner, WebThemeEngine::StateNormal, WebRect(cornerRect), 0); |
| #endif |
| } |
| |
| bool ScrollbarTheme::shouldCenterOnThumb(const ScrollbarThemeClient* scrollbar, const PlatformMouseEvent& evt) |
| { |
| return Platform::current()->scrollbarBehavior()->shouldCenterOnThumb(static_cast<WebScrollbarBehavior::Button>(evt.button()), evt.shiftKey(), evt.altKey()); |
| } |
| |
| bool ScrollbarTheme::shouldSnapBackToDragOrigin(const ScrollbarThemeClient* scrollbar, const PlatformMouseEvent& evt) |
| { |
| IntPoint mousePosition = scrollbar->convertFromContainingWindow(evt.position()); |
| mousePosition.move(scrollbar->x(), scrollbar->y()); |
| return Platform::current()->scrollbarBehavior()->shouldSnapBackToDragOrigin(mousePosition, trackRect(scrollbar), scrollbar->orientation() == HorizontalScrollbar); |
| } |
| |
| int ScrollbarTheme::thumbPosition(const ScrollbarThemeClient* scrollbar) |
| { |
| if (scrollbar->enabled()) { |
| float size = scrollbar->totalSize() - scrollbar->visibleSize(); |
| // Avoid doing a floating point divide by zero and return 1 when usedTotalSize == visibleSize. |
| if (!size) |
| return 0; |
| float pos = std::max(0.0f, scrollbar->currentPos()) * (trackLength(scrollbar) - thumbLength(scrollbar)) / size; |
| return (pos < 1 && pos > 0) ? 1 : pos; |
| } |
| return 0; |
| } |
| |
| int ScrollbarTheme::thumbLength(const ScrollbarThemeClient* scrollbar) |
| { |
| if (!scrollbar->enabled()) |
| return 0; |
| |
| float overhang = fabsf(scrollbar->elasticOverscroll()); |
| float proportion = 0.0f; |
| float totalSize = scrollbar->totalSize(); |
| if (totalSize > 0.0f) { |
| proportion = (scrollbar->visibleSize() - overhang) / totalSize; |
| } |
| int trackLen = trackLength(scrollbar); |
| int length = round(proportion * trackLen); |
| length = std::max(length, minimumThumbLength(scrollbar)); |
| if (length > trackLen) |
| length = 0; // Once the thumb is below the track length, it just goes away (to make more room for the track). |
| return length; |
| } |
| |
| int ScrollbarTheme::trackPosition(const ScrollbarThemeClient* scrollbar) |
| { |
| IntRect constrainedTrackRect = constrainTrackRectToTrackPieces(scrollbar, trackRect(scrollbar)); |
| return (scrollbar->orientation() == HorizontalScrollbar) ? constrainedTrackRect.x() - scrollbar->x() : constrainedTrackRect.y() - scrollbar->y(); |
| } |
| |
| int ScrollbarTheme::trackLength(const ScrollbarThemeClient* scrollbar) |
| { |
| IntRect constrainedTrackRect = constrainTrackRectToTrackPieces(scrollbar, trackRect(scrollbar)); |
| return (scrollbar->orientation() == HorizontalScrollbar) ? constrainedTrackRect.width() : constrainedTrackRect.height(); |
| } |
| |
| IntRect ScrollbarTheme::thumbRect(const ScrollbarThemeClient* scrollbar) |
| { |
| if (!hasThumb(scrollbar)) |
| return IntRect(); |
| |
| IntRect track = trackRect(scrollbar); |
| IntRect startTrackRect; |
| IntRect thumbRect; |
| IntRect endTrackRect; |
| splitTrack(scrollbar, track, startTrackRect, thumbRect, endTrackRect); |
| |
| return thumbRect; |
| } |
| |
| int ScrollbarTheme::thumbThickness(const ScrollbarThemeClient* scrollbar) |
| { |
| IntRect track = trackRect(scrollbar); |
| return scrollbar->orientation() == HorizontalScrollbar ? track.height() : track.width(); |
| } |
| |
| int ScrollbarTheme::minimumThumbLength(const ScrollbarThemeClient* scrollbar) |
| { |
| return scrollbarThickness(scrollbar->controlSize()); |
| } |
| |
| void ScrollbarTheme::splitTrack(const ScrollbarThemeClient* scrollbar, const IntRect& unconstrainedTrackRect, IntRect& beforeThumbRect, IntRect& thumbRect, IntRect& afterThumbRect) |
| { |
| // This function won't even get called unless we're big enough to have some combination of these three rects where at least |
| // one of them is non-empty. |
| IntRect trackRect = constrainTrackRectToTrackPieces(scrollbar, unconstrainedTrackRect); |
| int thumbPos = thumbPosition(scrollbar); |
| if (scrollbar->orientation() == HorizontalScrollbar) { |
| thumbRect = IntRect(trackRect.x() + thumbPos, trackRect.y(), thumbLength(scrollbar), scrollbar->height()); |
| beforeThumbRect = IntRect(trackRect.x(), trackRect.y(), thumbPos + thumbRect.width() / 2, trackRect.height()); |
| afterThumbRect = IntRect(trackRect.x() + beforeThumbRect.width(), trackRect.y(), trackRect.maxX() - beforeThumbRect.maxX(), trackRect.height()); |
| } else { |
| thumbRect = IntRect(trackRect.x(), trackRect.y() + thumbPos, scrollbar->width(), thumbLength(scrollbar)); |
| beforeThumbRect = IntRect(trackRect.x(), trackRect.y(), trackRect.width(), thumbPos + thumbRect.height() / 2); |
| afterThumbRect = IntRect(trackRect.x(), trackRect.y() + beforeThumbRect.height(), trackRect.width(), trackRect.maxY() - beforeThumbRect.maxY()); |
| } |
| } |
| |
| ScrollbarTheme* ScrollbarTheme::theme() |
| { |
| if (ScrollbarTheme::mockScrollbarsEnabled()) { |
| if (RuntimeEnabledFeatures::overlayScrollbarsEnabled()) { |
| DEFINE_STATIC_LOCAL(ScrollbarThemeOverlayMock, overlayMockTheme, ()); |
| return &overlayMockTheme; |
| } |
| |
| DEFINE_STATIC_LOCAL(ScrollbarThemeMock, mockTheme, ()); |
| return &mockTheme; |
| } |
| return nativeTheme(); |
| } |
| |
| void ScrollbarTheme::setMockScrollbarsEnabled(bool flag) |
| { |
| gMockScrollbarsEnabled = flag; |
| } |
| |
| bool ScrollbarTheme::mockScrollbarsEnabled() |
| { |
| return gMockScrollbarsEnabled; |
| } |
| |
| DisplayItem::Type ScrollbarTheme::buttonPartToDisplayItemType(ScrollbarPart part) |
| { |
| switch (part) { |
| case BackButtonStartPart: |
| return DisplayItem::ScrollbarBackButtonStart; |
| case BackButtonEndPart: |
| return DisplayItem::ScrollbarBackButtonEnd; |
| case ForwardButtonStartPart: |
| return DisplayItem::ScrollbarForwardButtonStart; |
| case ForwardButtonEndPart: |
| return DisplayItem::ScrollbarForwardButtonEnd; |
| default: |
| ASSERT_NOT_REACHED(); |
| return DisplayItem::ScrollbarBackButtonStart; |
| } |
| } |
| |
| DisplayItem::Type ScrollbarTheme::trackPiecePartToDisplayItemType(ScrollbarPart part) |
| { |
| switch (part) { |
| case BackTrackPart: |
| return DisplayItem::ScrollbarBackTrack; |
| case ForwardTrackPart: |
| return DisplayItem::ScrollbarForwardTrack; |
| default: |
| ASSERT_NOT_REACHED(); |
| return DisplayItem::ScrollbarBackTrack; |
| } |
| } |
| |
| } // namespace blink |