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PopupMenu: Extract implementation of ensureItemComponentIsVisible into static function

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This makes it a bit easier to see exactly which PopupMenu state is used
during the calculation, and enforces that no menu state is modified
during the call.
This commit is contained in:
reuk 2025-08-18 18:10:36 +01:00
parent 90abc8c1c5
commit edfa87801c
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1 changed files with 31 additions and 11 deletions
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42
modules/juce_gui_basics/menus/juce_PopupMenu.cpp
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@ -431,15 +431,15 @@ struct MenuWindow final : public Component
if (iter != items.end())
{
const auto targetPosition = [&]
const auto targetPosition = std::invoke ([&]
{
if (auto* pc = options.getParentComponent())
return pc->getLocalPoint (nullptr, targetArea.getTopLeft());
return targetArea.getTopLeft();
}();
});
auto y = targetPosition.getY() - windowPos.getY();
const auto y = targetPosition.getY() - windowPos.getY();
ensureItemComponentIsVisible (**iter, isPositiveAndBelow (y, windowPos.getHeight()) ? y : -1);
}
}
@ -1093,20 +1093,40 @@ struct MenuWindow final : public Component
void ensureItemComponentIsVisible (const ItemComponent& itemComp, int wantedY)
{
if (windowPos.getHeight() <= PopupMenuSettings::scrollZone * 4
|| (wantedY <= 0 && 0 <= itemComp.getY() && itemComp.getBottom() <= windowPos.getHeight()))
const auto parentArea = getParentArea (windowPos.getPosition(), options.getParentComponent()) / scaleFactor;
if (const auto posAndOffset = computeInitialPosAndOffset (windowPos, parentArea, itemComp.getBounds(), childYOffset, wantedY))
{
return;
std::tie (windowPos, childYOffset) = std::tie (posAndOffset->windowPos, posAndOffset->childYOffset);
updateYPositions();
}
}
struct PosAndOffset
{
Rectangle<int> windowPos;
int childYOffset = 0;
};
static std::optional<PosAndOffset> computeInitialPosAndOffset (Rectangle<int> windowPos,
const Rectangle<int>& parentArea,
const Rectangle<int>& itemCompBounds,
int childYOffset,
int wantedY)
{
if (windowPos.getHeight() <= PopupMenuSettings::scrollZone * 4
|| (wantedY <= 0 && 0 <= itemCompBounds.getY() && itemCompBounds.getBottom() <= windowPos.getHeight()))
{
return {};
}
if (wantedY < 0)
wantedY = jlimit (PopupMenuSettings::scrollZone,
jmax (PopupMenuSettings::scrollZone,
windowPos.getHeight() - (PopupMenuSettings::scrollZone + itemComp.getHeight())),
itemComp.getY());
windowPos.getHeight() - (PopupMenuSettings::scrollZone + itemCompBounds.getHeight())),
itemCompBounds.getY());
const auto parentArea = getParentArea (windowPos.getPosition(), options.getParentComponent()) / scaleFactor;
const auto deltaY = windowPos.getY() + wantedY - itemComp.getY();
const auto deltaY = windowPos.getY() + wantedY - itemCompBounds.getY();
windowPos.setSize (jmin (windowPos.getWidth(), parentArea.getWidth()),
jmin (windowPos.getHeight(), parentArea.getHeight()));
@ -1118,7 +1138,7 @@ struct MenuWindow final : public Component
childYOffset -= (deltaY - newY);
windowPos.setPosition (windowPos.getX(), newY);
updateYPositions();
return PosAndOffset { windowPos, childYOffset };
}
void resizeToBestWindowPos()