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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2008, 2009 Google Inc.
*
* 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 "ScrollbarThemeChromiumWin.h"
#include <windows.h>
#include <vsstyle.h>
#include "ChromiumBridge.h"
#include "GraphicsContext.h"
#include "PlatformContextSkia.h"
#include "PlatformMouseEvent.h"
#include "Scrollbar.h"
#include "WindowsVersion.h"
namespace WebCore {
ScrollbarTheme* ScrollbarTheme::nativeTheme()
{
static ScrollbarThemeChromiumWin theme;
return &theme;
}
// The scrollbar size in DumpRenderTree on the Mac - so we can match their
// layout results. Entries are for regular, small, and mini scrollbars.
// Metrics obtained using [NSScroller scrollerWidthForControlSize:]
static const int kMacScrollbarSize[3] = { 15, 11, 15 };
// Constants used to figure the drag rect outside which we should snap the
// scrollbar thumb back to its origin. These calculations are based on
// observing the behavior of the MSVC8 main window scrollbar + some
// guessing/extrapolation.
static const int kOffEndMultiplier = 3;
static const int kOffSideMultiplier = 8;
int ScrollbarThemeChromiumWin::scrollbarThickness(ScrollbarControlSize controlSize)
{
static int thickness;
if (!thickness) {
if (ChromiumBridge::layoutTestMode())
return kMacScrollbarSize[controlSize];
thickness = GetSystemMetrics(SM_CXVSCROLL);
}
return thickness;
}
bool ScrollbarThemeChromiumWin::invalidateOnMouseEnterExit()
{
return isVistaOrNewer();
}
bool ScrollbarThemeChromiumWin::shouldSnapBackToDragOrigin(Scrollbar* scrollbar, const PlatformMouseEvent& evt)
{
// Find the rect within which we shouldn't snap, by expanding the track rect
// in both dimensions.
IntRect rect = trackRect(scrollbar);
const bool horz = scrollbar->orientation() == HorizontalScrollbar;
const int thickness = scrollbarThickness(scrollbar->controlSize());
rect.inflateX((horz ? kOffEndMultiplier : kOffSideMultiplier) * thickness);
rect.inflateY((horz ? kOffSideMultiplier : kOffEndMultiplier) * thickness);
// Convert the event to local coordinates.
IntPoint mousePosition = scrollbar->convertFromContainingWindow(evt.pos());
mousePosition.move(scrollbar->x(), scrollbar->y());
// We should snap iff the event is outside our calculated rect.
return !rect.contains(mousePosition);
}
void ScrollbarThemeChromiumWin::paintTrackPiece(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart partType)
{
bool horz = scrollbar->orientation() == HorizontalScrollbar;
int partId;
if (partType == BackTrackPart)
partId = horz ? SBP_UPPERTRACKHORZ : SBP_UPPERTRACKVERT;
else
partId = horz ? SBP_LOWERTRACKHORZ : SBP_LOWERTRACKVERT;
IntRect alignRect = trackRect(scrollbar, false);
// Draw the track area before/after the thumb on the scroll bar.
ChromiumBridge::paintScrollbarTrack(
gc,
partId,
getThemeState(scrollbar, partType),
getClassicThemeState(scrollbar, partType),
rect,
alignRect);
}
void ScrollbarThemeChromiumWin::paintButton(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart part)
{
bool horz = scrollbar->orientation() == HorizontalScrollbar;
int partId;
if (part == BackButtonStartPart || part == ForwardButtonStartPart)
partId = horz ? DFCS_SCROLLLEFT : DFCS_SCROLLUP;
else
partId = horz ? DFCS_SCROLLRIGHT : DFCS_SCROLLDOWN;
// Draw the thumb (the box you drag in the scroll bar to scroll).
ChromiumBridge::paintScrollbarArrow(
gc,
getThemeArrowState(scrollbar, part),
partId | getClassicThemeState(scrollbar, part),
rect);
}
void ScrollbarThemeChromiumWin::paintThumb(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect)
{
bool horz = scrollbar->orientation() == HorizontalScrollbar;
// Draw the thumb (the box you drag in the scroll bar to scroll).
ChromiumBridge::paintScrollbarThumb(
gc,
horz ? SBP_THUMBBTNHORZ : SBP_THUMBBTNVERT,
getThemeState(scrollbar, ThumbPart),
getClassicThemeState(scrollbar, ThumbPart),
rect);
// Draw the gripper (the three little lines on the thumb).
ChromiumBridge::paintScrollbarThumb(
gc,
horz ? SBP_GRIPPERHORZ : SBP_GRIPPERVERT,
getThemeState(scrollbar, ThumbPart),
getClassicThemeState(scrollbar, ThumbPart),
rect);
}
int ScrollbarThemeChromiumWin::getThemeState(Scrollbar* scrollbar, ScrollbarPart part) const
{
// When dragging the thumb, draw thumb pressed and other segments normal
// regardless of where the cursor actually is. See also four places in
// getThemeArrowState().
if (scrollbar->pressedPart() == ThumbPart) {
if (part == ThumbPart)
return SCRBS_PRESSED;
return isVistaOrNewer() ? SCRBS_HOVER : SCRBS_NORMAL;
}
if (!scrollbar->enabled())
return SCRBS_DISABLED;
if (scrollbar->hoveredPart() != part || part == BackTrackPart || part == ForwardTrackPart)
return (scrollbar->hoveredPart() == NoPart || !isVistaOrNewer()) ? SCRBS_NORMAL : SCRBS_HOVER;
if (scrollbar->pressedPart() == NoPart)
return SCRBS_HOT;
return (scrollbar->pressedPart() == part) ? SCRBS_PRESSED : SCRBS_NORMAL;
}
int ScrollbarThemeChromiumWin::getThemeArrowState(Scrollbar* scrollbar, ScrollbarPart part) const
{
// We could take advantage of knowing the values in the state enum to write
// some simpler code, but treating the state enum as a black box seems
// clearer and more future-proof.
if (part == BackButtonStartPart || part == ForwardButtonStartPart) {
if (scrollbar->orientation() == HorizontalScrollbar) {
if (scrollbar->pressedPart() == ThumbPart)
return !isVistaOrNewer() ? ABS_LEFTNORMAL : ABS_LEFTHOVER;
if (!scrollbar->enabled())
return ABS_LEFTDISABLED;
if (scrollbar->hoveredPart() != part)
return ((scrollbar->hoveredPart() == NoPart) || !isVistaOrNewer()) ? ABS_LEFTNORMAL : ABS_LEFTHOVER;
if (scrollbar->pressedPart() == NoPart)
return ABS_LEFTHOT;
return (scrollbar->pressedPart() == part) ?
ABS_LEFTPRESSED : ABS_LEFTNORMAL;
}
if (scrollbar->pressedPart() == ThumbPart)
return !isVistaOrNewer() ? ABS_UPNORMAL : ABS_UPHOVER;
if (!scrollbar->enabled())
return ABS_UPDISABLED;
if (scrollbar->hoveredPart() != part)
return ((scrollbar->hoveredPart() == NoPart) || !isVistaOrNewer()) ? ABS_UPNORMAL : ABS_UPHOVER;
if (scrollbar->pressedPart() == NoPart)
return ABS_UPHOT;
return (scrollbar->pressedPart() == part) ? ABS_UPPRESSED : ABS_UPNORMAL;
}
if (scrollbar->orientation() == HorizontalScrollbar) {
if (scrollbar->pressedPart() == ThumbPart)
return !isVistaOrNewer() ? ABS_RIGHTNORMAL : ABS_RIGHTHOVER;
if (!scrollbar->enabled())
return ABS_RIGHTDISABLED;
if (scrollbar->hoveredPart() != part)
return ((scrollbar->hoveredPart() == NoPart) || !isVistaOrNewer()) ? ABS_RIGHTNORMAL : ABS_RIGHTHOVER;
if (scrollbar->pressedPart() == NoPart)
return ABS_RIGHTHOT;
return (scrollbar->pressedPart() == part) ? ABS_RIGHTPRESSED : ABS_RIGHTNORMAL;
}
if (scrollbar->pressedPart() == ThumbPart)
return !isVistaOrNewer() ? ABS_DOWNNORMAL : ABS_DOWNHOVER;
if (!scrollbar->enabled())
return ABS_DOWNDISABLED;
if (scrollbar->hoveredPart() != part)
return ((scrollbar->hoveredPart() == NoPart) || !isVistaOrNewer()) ? ABS_DOWNNORMAL : ABS_DOWNHOVER;
if (scrollbar->pressedPart() == NoPart)
return ABS_DOWNHOT;
return (scrollbar->pressedPart() == part) ? ABS_DOWNPRESSED : ABS_DOWNNORMAL;
}
int ScrollbarThemeChromiumWin::getClassicThemeState(Scrollbar* scrollbar, ScrollbarPart part) const
{
// When dragging the thumb, draw the buttons normal even when hovered.
if (scrollbar->pressedPart() == ThumbPart)
return 0;
if (!scrollbar->enabled())
return DFCS_INACTIVE;
if (scrollbar->hoveredPart() != part || part == BackTrackPart || part == ForwardTrackPart)
return 0;
if (scrollbar->pressedPart() == NoPart)
return DFCS_HOT;
return (scrollbar->pressedPart() == part) ? (DFCS_PUSHED | DFCS_FLAT) : 0;
}
bool ScrollbarThemeChromiumWin::shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent& evt)
{
return evt.shiftKey() && evt.button() == LeftButton;
}
IntSize ScrollbarThemeChromiumWin::buttonSize(Scrollbar* scrollbar)
{
// Our desired rect is essentially thickness by thickness.
// Our actual rect will shrink to half the available space when we have < 2
// times thickness pixels left. This allows the scrollbar to scale down
// and function even at tiny sizes.
int thickness = scrollbarThickness(scrollbar->controlSize());
// In layout test mode, we force the button "girth" (i.e., the length of
// the button along the axis of the scrollbar) to be a fixed size.
// FIXME: This is retarded! scrollbarThickness is already fixed in layout
// test mode so that should be enough to result in repeatable results, but
// preserving this hack avoids having to rebaseline pixel tests.
const int kLayoutTestModeGirth = 17;
int girth = ChromiumBridge::layoutTestMode() ? kLayoutTestModeGirth : thickness;
if (scrollbar->orientation() == HorizontalScrollbar) {
int width = scrollbar->width() < 2 * girth ? scrollbar->width() / 2 : girth;
return IntSize(width, thickness);
}
int height = scrollbar->height() < 2 * girth ? scrollbar->height() / 2 : girth;
return IntSize(thickness, height);
}
} // namespace WebCore
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