//----------------------------------------------------------------------------//
void Scrollbar::setConfig(const float* const document_size,
const float* const page_size,
const float* const step_size,
const float* const overlap_size,
const float* const position)
{
const bool reset_max_position = d_endLockPosition && isAtEnd();
bool config_changed = false;
bool position_changed = false;
if (document_size && (d_documentSize != *document_size))
{
d_documentSize = *document_size;
config_changed = true;
}
if (page_size && (d_pageSize != *page_size))
{
d_pageSize = *page_size;
config_changed = true;
}
if (step_size && (d_stepSize != *step_size))
{
d_stepSize = *step_size;
config_changed = true;
}
if (overlap_size && (d_overlapSize != *overlap_size))
{
d_overlapSize = *overlap_size;
config_changed = true;
}
if (position)
position_changed = setScrollPosition_impl(*position);
else if (reset_max_position)
position_changed = setScrollPosition_impl(getMaxScrollPosition());
// _always_ update the thumb to keep things in sync. (though this
// can cause a double-trigger of EventScrollPositionChanged, which
// also happens with setScrollPosition anyway).
updateThumb();
//
// Fire appropriate events based on actions we took.
//
if (config_changed)
{
WindowEventArgs args(this);
onScrollConfigChanged(args);
}
if (position_changed)
{
WindowEventArgs args(this);
onScrollPositionChanged(args);
}
}
//----------------------------------------------------------------------------//
void Scrollbar::setScrollPosition(float position)
{
const bool modified = setScrollPosition_impl(position);
updateThumb();
// notification if required
if (modified)
{
WindowEventArgs args(this);
onScrollPositionChanged(args);
}
}
void GUIScrollBar::scroll(float amount)
{
float newHandlePos = Math::clamp01(mHandleBtn->getHandlePos() - amount);
float oldHandlePos = mHandleBtn->getHandlePos();
mHandleBtn->_setHandlePos(newHandlePos);
if (oldHandlePos != mHandleBtn->getHandlePos())
{
mHandleBtn->_markLayoutAsDirty();
if (!onScrollPositionChanged.empty())
onScrollPositionChanged(newHandlePos);
}
}
/*************************************************************************
Set the current position of scroll bar within the document.
*************************************************************************/
void Scrollbar::setScrollPosition(float position)
{
float old_pos = d_position;
// max position is (docSize - pageSize), but must be at least 0 (in case doc size is very small)
float max_pos = ceguimax((d_documentSize - d_pageSize), 0.0f);
// limit position to valid range: 0 <= position <= max_pos
d_position = (position >= 0) ? ((position <= max_pos) ? position : max_pos) : 0.0f;
updateThumb();
// notification if required
if (d_position != old_pos)
{
WindowEventArgs args(this);
onScrollPositionChanged(args);
}
}
void GUIScrollBar::handleMoved(float handlePct)
{
if(!onScrollPositionChanged.empty())
onScrollPositionChanged(handlePct);
}