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scrollcontainer: Add automatic scrollbar calculation (#14623)

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New parameter 'content padding'. When specified, the scrollbar
max value is calculated automatically. This aims to reduce manual
calculation functions.
This commit is contained in:
SmallJoker
2024-10-08 21:45:27 +02:00
committed by GitHub
parent 291c3ad0c1
commit 13f533d490
8 changed files with 87 additions and 29 deletions
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44
src/gui/guiScrollContainer.cpp
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@@ -67,6 +67,50 @@ void GUIScrollContainer::draw()
}
}
void GUIScrollContainer::setScrollBar(GUIScrollBar *scrollbar)
{
m_scrollbar = scrollbar;
if (m_scrollbar && m_content_padding_px.has_value() && m_scrollfactor != 0.0f) {
// Set the scrollbar max value based on the content size.
// Get content size based on elements
core::rect<s32> size;
for (gui::IGUIElement *e : Children) {
core::rect<s32> abs_rect = e->getAbsolutePosition();
size.addInternalPoint(abs_rect.LowerRightCorner);
}
s32 visible_content_px = (
m_orientation == VERTICAL
? AbsoluteClippingRect.getHeight()
: AbsoluteClippingRect.getWidth()
);
s32 total_content_px = *m_content_padding_px + (
m_orientation == VERTICAL
? (size.LowerRightCorner.Y - AbsoluteClippingRect.UpperLeftCorner.Y)
: (size.LowerRightCorner.X - AbsoluteClippingRect.UpperLeftCorner.X)
);
s32 hidden_content_px = std::max<s32>(0, total_content_px - visible_content_px);
m_scrollbar->setMin(0);
m_scrollbar->setMax(std::ceil(hidden_content_px / std::fabs(m_scrollfactor)));
// Note: generally, the scrollbar has the same size as the scroll container.
// However, in case it isn't, proportional adjustments are needed.
s32 scrollbar_px = (
m_scrollbar->isHorizontal()
? m_scrollbar->getRelativePosition().getWidth()
: m_scrollbar->getRelativePosition().getHeight()
);
m_scrollbar->setPageSize((total_content_px * scrollbar_px) / visible_content_px);
}
updateScrolling();
}
void GUIScrollContainer::updateScrolling()
{
s32 pos = m_scrollbar->getPos();