Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation, ScrollbarControlSize controlSize, ScrollbarTheme* theme)
: m_scrollableArea(scrollableArea)
, m_orientation(orientation)
, m_controlSize(controlSize)
, m_theme(theme)
, m_visibleSize(0)
, m_totalSize(0)
, m_currentPos(0)
, m_dragOrigin(0)
, m_hoveredPart(NoPart)
, m_pressedPart(NoPart)
, m_pressedPos(0)
, m_scrollPos(0)
, m_draggingDocument(false)
, m_documentDragPos(0)
, m_enabled(true)
, m_scrollTimer(this, &Scrollbar::autoscrollTimerFired)
, m_overlapsResizer(false)
, m_isAlphaLocked(false)
, m_elasticOverscroll(0)
{
if (!m_theme)
m_theme = ScrollbarTheme::theme();
m_theme->registerScrollbar(this);
// FIXME: This is ugly and would not be necessary if we fix cross-platform code to actually query for
// scrollbar thickness and use it when sizing scrollbars (rather than leaving one dimension of the scrollbar
// alone when sizing).
int thickness = m_theme->scrollbarThickness(controlSize);
Widget::setFrameRect(IntRect(0, 0, thickness, thickness));
m_currentPos = scrollableAreaCurrentPos();
}
void Scrollbar::offsetDidChange()
{
ASSERT(m_scrollableArea);
float position = scrollableAreaCurrentPos();
if (position == m_currentPos)
return;
int oldThumbPosition = theme()->thumbPosition(this);
m_currentPos = position;
updateThumbPosition();
if (m_pressedPart == ThumbPart)
setPressedPos(m_pressedPos + theme()->thumbPosition(this) - oldThumbPosition);
}
void Scrollbar::offsetDidChange() {
ASSERT(m_scrollableArea);
float position = scrollableAreaCurrentPos();
if (position == m_currentPos)
return;
float oldPosition = m_currentPos;
int oldThumbPosition = theme().thumbPosition(*this);
m_currentPos = position;
ScrollbarPart invalidParts =
theme().invalidateOnThumbPositionChange(*this, oldPosition, position);
setNeedsPaintInvalidation(invalidParts);
if (m_pressedPart == ThumbPart)
setPressedPos(m_pressedPos + theme().thumbPosition(*this) -
oldThumbPosition);
}
Scrollbar::Scrollbar(ScrollableArea* scrollableArea,
ScrollbarOrientation orientation,
ScrollbarControlSize controlSize,
HostWindow* hostWindow,
ScrollbarTheme* theme)
: m_scrollableArea(scrollableArea),
m_orientation(orientation),
m_controlSize(controlSize),
m_theme(theme ? *theme : ScrollbarTheme::theme()),
m_hostWindow(hostWindow),
m_visibleSize(0),
m_totalSize(0),
m_currentPos(0),
m_dragOrigin(0),
m_hoveredPart(NoPart),
m_pressedPart(NoPart),
m_pressedPos(0),
m_scrollPos(0),
m_draggingDocument(false),
m_documentDragPos(0),
m_enabled(true),
m_scrollTimer(this, &Scrollbar::autoscrollTimerFired),
m_elasticOverscroll(0),
m_trackNeedsRepaint(true),
m_thumbNeedsRepaint(true) {
m_theme.registerScrollbar(*this);
// FIXME: This is ugly and would not be necessary if we fix cross-platform
// code to actually query for scrollbar thickness and use it when sizing
// scrollbars (rather than leaving one dimension of the scrollbar alone when
// sizing).
int thickness = m_theme.scrollbarThickness(controlSize);
m_themeScrollbarThickness = thickness;
if (m_hostWindow)
thickness = m_hostWindow->windowToViewportScalar(thickness);
Widget::setFrameRect(IntRect(0, 0, thickness, thickness));
m_currentPos = scrollableAreaCurrentPos();
}
Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation)
: m_scrollableArea(scrollableArea)
, m_orientation(orientation)
, m_visibleSize(0)
, m_totalSize(0)
, m_currentPos(0)
, m_dragOrigin(0)
, m_hoveredPart(NoPart)
, m_pressedPart(NoPart)
, m_pressedPos(0)
, m_scrollPos(0)
, m_documentDragPos(0)
, m_enabled(true)
, m_scrollTimer(this, &Scrollbar::autoscrollTimerFired)
, m_overlapsResizer(false)
{
// FIXME: This is ugly and would not be necessary if we fix cross-platform code to actually query for
// scrollbar thickness and use it when sizing scrollbars (rather than leaving one dimension of the scrollbar
// alone when sizing).
int thickness = scrollbarThickness();
Widget::setFrameRect(IntRect(0, 0, thickness, thickness));
m_currentPos = scrollableAreaCurrentPos();
}
