| /* |
| * 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 "config.h" |
| #include "ScrollbarThemeComposite.h" |
| |
| #include "GraphicsContext.h" |
| #include "Scrollbar.h" |
| |
| namespace WebCore { |
| |
| bool ScrollbarThemeComposite::paint(Scrollbar& scrollbar, GraphicsContext& graphicsContext, const IntRect& damageRect) |
| { |
| // Create the ScrollbarControlPartMask based on the damageRect |
| ScrollbarControlPartMask scrollMask = NoPart; |
| |
| IntRect backButtonStartPaintRect; |
| IntRect backButtonEndPaintRect; |
| IntRect forwardButtonStartPaintRect; |
| IntRect forwardButtonEndPaintRect; |
| if (hasButtons(scrollbar)) { |
| backButtonStartPaintRect = backButtonRect(scrollbar, BackButtonStartPart, true); |
| if (damageRect.intersects(backButtonStartPaintRect)) |
| scrollMask |= BackButtonStartPart; |
| backButtonEndPaintRect = backButtonRect(scrollbar, BackButtonEndPart, true); |
| if (damageRect.intersects(backButtonEndPaintRect)) |
| scrollMask |= BackButtonEndPart; |
| forwardButtonStartPaintRect = forwardButtonRect(scrollbar, ForwardButtonStartPart, true); |
| if (damageRect.intersects(forwardButtonStartPaintRect)) |
| scrollMask |= ForwardButtonStartPart; |
| forwardButtonEndPaintRect = forwardButtonRect(scrollbar, ForwardButtonEndPart, true); |
| if (damageRect.intersects(forwardButtonEndPaintRect)) |
| scrollMask |= ForwardButtonEndPart; |
| } |
| |
| IntRect startTrackRect; |
| IntRect thumbRect; |
| IntRect endTrackRect; |
| IntRect trackPaintRect = trackRect(scrollbar, true); |
| if (damageRect.intersects(trackPaintRect)) |
| scrollMask |= TrackBGPart; |
| bool thumbPresent = hasThumb(scrollbar); |
| if (thumbPresent) { |
| IntRect track = trackRect(scrollbar); |
| splitTrack(scrollbar, track, startTrackRect, thumbRect, endTrackRect); |
| if (damageRect.intersects(thumbRect)) |
| scrollMask |= ThumbPart; |
| if (damageRect.intersects(startTrackRect)) |
| scrollMask |= BackTrackPart; |
| if (damageRect.intersects(endTrackRect)) |
| scrollMask |= ForwardTrackPart; |
| } |
| |
| willPaintScrollbar(graphicsContext, scrollbar); |
| |
| // 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); |
| |
| didPaintScrollbar(graphicsContext, scrollbar); |
| return true; |
| } |
| |
| ScrollbarPart ScrollbarThemeComposite::hitTest(Scrollbar& 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 ScrollbarThemeComposite::invalidatePart(Scrollbar& 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 ScrollbarThemeComposite::splitTrack(Scrollbar& 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 thickness = scrollbar.orientation() == HorizontalScrollbar ? scrollbar.height() : scrollbar.width(); |
| int thumbPos = thumbPosition(scrollbar); |
| if (scrollbar.orientation() == HorizontalScrollbar) { |
| thumbRect = IntRect(trackRect.x() + thumbPos, trackRect.y() + (trackRect.height() - thickness) / 2, thumbLength(scrollbar), thickness); |
| 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.width() - thickness) / 2, trackRect.y() + thumbPos, thickness, 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()); |
| } |
| } |
| |
| // Returns the size represented by track taking into account scrolling past |
| // the end of the document. |
| static float usedTotalSize(Scrollbar& scrollbar) |
| { |
| float overhangAtStart = -scrollbar.currentPos(); |
| float overhangAtEnd = scrollbar.currentPos() + scrollbar.visibleSize() - scrollbar.totalSize(); |
| float overhang = std::max(0.0f, std::max(overhangAtStart, overhangAtEnd)); |
| return scrollbar.totalSize() + overhang; |
| } |
| |
| int ScrollbarThemeComposite::thumbPosition(Scrollbar& scrollbar) |
| { |
| if (scrollbar.enabled()) { |
| float size = usedTotalSize(scrollbar) - scrollbar.visibleSize(); |
| // Avoid doing a floating point divide by zero and return 1 when usedTotalSize == visibleSize. |
| if (!size) |
| return 1; |
| float pos = std::max(0.0f, scrollbar.currentPos()) * (trackLength(scrollbar) - thumbLength(scrollbar)) / size; |
| return (pos < 1 && pos > 0) ? 1 : pos; |
| } |
| return 0; |
| } |
| |
| int ScrollbarThemeComposite::thumbLength(Scrollbar& scrollbar) |
| { |
| if (!scrollbar.enabled()) |
| return 0; |
| |
| float proportion = scrollbar.visibleSize() / usedTotalSize(scrollbar); |
| 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 ScrollbarThemeComposite::minimumThumbLength(Scrollbar& scrollbar) |
| { |
| return scrollbarThickness(scrollbar.controlSize()); |
| } |
| |
| int ScrollbarThemeComposite::trackPosition(Scrollbar& scrollbar) |
| { |
| IntRect constrainedTrackRect = constrainTrackRectToTrackPieces(scrollbar, trackRect(scrollbar)); |
| return (scrollbar.orientation() == HorizontalScrollbar) ? constrainedTrackRect.x() - scrollbar.x() : constrainedTrackRect.y() - scrollbar.y(); |
| } |
| |
| int ScrollbarThemeComposite::trackLength(Scrollbar& scrollbar) |
| { |
| IntRect constrainedTrackRect = constrainTrackRectToTrackPieces(scrollbar, trackRect(scrollbar)); |
| return (scrollbar.orientation() == HorizontalScrollbar) ? constrainedTrackRect.width() : constrainedTrackRect.height(); |
| } |
| |
| void ScrollbarThemeComposite::paintScrollCorner(ScrollView*, GraphicsContext& context, const IntRect& cornerRect) |
| { |
| context.fillRect(cornerRect, Color::white); |
| } |
| |
| IntRect ScrollbarThemeComposite::thumbRect(Scrollbar& scrollbar) |
| { |
| if (!hasThumb(scrollbar)) |
| return IntRect(); |
| |
| IntRect track = trackRect(scrollbar); |
| IntRect startTrackRect; |
| IntRect thumbRect; |
| IntRect endTrackRect; |
| splitTrack(scrollbar, track, startTrackRect, thumbRect, endTrackRect); |
| |
| return thumbRect; |
| } |
| |
| void ScrollbarThemeComposite::paintOverhangAreas(ScrollView&, GraphicsContext& context, const IntRect& horizontalOverhangRect, const IntRect& verticalOverhangRect, const IntRect& dirtyRect) |
| { |
| context.setFillColor(Color::white); |
| if (!horizontalOverhangRect.isEmpty()) |
| context.fillRect(intersection(horizontalOverhangRect, dirtyRect)); |
| |
| context.setFillColor(Color::white); |
| if (!verticalOverhangRect.isEmpty()) |
| context.fillRect(intersection(verticalOverhangRect, dirtyRect)); |
| } |
| |
| } |
