| /* |
| * 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 "Chrome.h" |
| #include "ChromeClient.h" |
| #include "Frame.h" |
| #include "FrameView.h" |
| #include "GraphicsContext.h" |
| #include "Page.h" |
| #include "PlatformMouseEvent.h" |
| #include "Scrollbar.h" |
| #include "ScrollbarClient.h" |
| #include "Settings.h" |
| |
| namespace WebCore { |
| |
| #if PLATFORM(WIN) |
| static Page* pageForScrollView(ScrollView* view) |
| { |
| if (!view) |
| return 0; |
| if (!view->isFrameView()) |
| return 0; |
| FrameView* frameView = static_cast<FrameView*>(view); |
| if (!frameView->frame()) |
| return 0; |
| return frameView->frame()->page(); |
| } |
| #endif |
| |
| 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; |
| } |
| |
| #if PLATFORM(WIN) |
| // FIXME: This API makes the assumption that the custom scrollbar's metrics will match |
| // the theme's metrics. This is not a valid assumption. The ability for a client to paint |
| // custom scrollbars should be removed once scrollbars can be styled via CSS. |
| if (Page* page = pageForScrollView(scrollbar->parent())) { |
| if (page->settings()->shouldPaintCustomScrollbars()) { |
| float proportion = static_cast<float>(scrollbar->visibleSize()) / scrollbar->totalSize(); |
| float value = scrollbar->currentPos() / static_cast<float>(scrollbar->maximum()); |
| ScrollbarControlState s = 0; |
| if (scrollbar->client()->isActive()) |
| s |= ActiveScrollbarState; |
| if (scrollbar->enabled()) |
| s |= EnabledScrollbarState; |
| if (scrollbar->pressedPart() != NoPart) |
| s |= PressedScrollbarState; |
| if (page->chrome()->client()->paintCustomScrollbar(graphicsContext, |
| scrollbar->frameRect(), |
| scrollbar->controlSize(), |
| s, |
| scrollbar->pressedPart(), |
| scrollbar->orientation() == VerticalScrollbar, |
| value, |
| proportion, |
| scrollMask)) |
| return true; |
| } |
| } |
| #endif |
| |
| // 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 ScrollbarThemeComposite::hitTest(Scrollbar* scrollbar, const PlatformMouseEvent& evt) |
| { |
| ScrollbarPart result = NoPart; |
| if (!scrollbar->enabled()) |
| return result; |
| |
| IntPoint mousePosition = scrollbar->convertFromContainingWindow(evt.pos()); |
| mousePosition.move(scrollbar->x(), scrollbar->y()); |
| |
| if (!scrollbar->frameRect().contains(mousePosition)) |
| return NoPart; |
| |
| result = ScrollbarBGPart; |
| |
| IntRect track = trackRect(scrollbar); |
| if (track.contains(mousePosition)) { |
| IntRect beforeThumbRect; |
| IntRect thumbRect; |
| IntRect afterThumbRect; |
| splitTrack(scrollbar, track, beforeThumbRect, thumbRect, afterThumbRect); |
| if (thumbRect.contains(mousePosition)) |
| result = ThumbPart; |
| else if (beforeThumbRect.contains(mousePosition)) |
| result = BackTrackPart; |
| else if (afterThumbRect.contains(mousePosition)) |
| result = ForwardTrackPart; |
| else |
| result = TrackBGPart; |
| } else if (backButtonRect(scrollbar, BackButtonStartPart).contains(mousePosition)) |
| result = BackButtonStartPart; |
| else if (backButtonRect(scrollbar, BackButtonEndPart).contains(mousePosition)) |
| result = BackButtonEndPart; |
| else if (forwardButtonRect(scrollbar, ForwardButtonStartPart).contains(mousePosition)) |
| result = ForwardButtonStartPart; |
| else if (forwardButtonRect(scrollbar, ForwardButtonEndPart).contains(mousePosition)) |
| 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.move(-scrollbar->x(), -scrollbar->y()); |
| 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.right() - beforeThumbRect.right(), 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.bottom() - beforeThumbRect.bottom()); |
| } |
| } |
| |
| int ScrollbarThemeComposite::thumbPosition(Scrollbar* scrollbar) |
| { |
| if (scrollbar->enabled()) |
| return scrollbar->currentPos() * (trackLength(scrollbar) - thumbLength(scrollbar)) / scrollbar->maximum(); |
| return 0; |
| } |
| |
| int ScrollbarThemeComposite::thumbLength(Scrollbar* scrollbar) |
| { |
| if (!scrollbar->enabled()) |
| return 0; |
| |
| float proportion = (float)scrollbar->visibleSize() / scrollbar->totalSize(); |
| int trackLen = trackLength(scrollbar); |
| int length = proportion * trackLen; |
| length = 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* view, GraphicsContext* context, const IntRect& cornerRect) |
| { |
| FrameView* frameView = static_cast<FrameView*>(view); |
| Page* page = frameView->frame() ? frameView->frame()->page() : 0; |
| if (page && page->settings()->shouldPaintCustomScrollbars()) { |
| if (!page->chrome()->client()->paintCustomScrollCorner(context, cornerRect)) |
| context->fillRect(cornerRect, Color::white, DeviceColorSpace); |
| } |
| } |
| |
| } |
