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InsertChildWidgetAt should preseve Horz/Vert Box padding

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This commit is contained in:
Steve Streeting 2024-02-07 17:44:14 +00:00
parent 0e458e2fb8
commit 6949149732
1 changed files with 43 additions and 1 deletions
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44
Source/StevesUEHelpers/Public/StevesUiHelpers.cpp
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@ -1,6 +1,8 @@
#include "StevesUiHelpers.h"
#include "Components/HorizontalBoxSlot.h"
#include "Components/PanelWidget.h"
#include "Components/VerticalBoxSlot.h"
UPanelSlot* StevesUiHelpers::InsertChildWidgetAt(UPanelWidget* Parent, UWidget* Child, int AtIndex)
{
@ -24,6 +26,32 @@ UPanelSlot* StevesUiHelpers::InsertChildWidgetAt(UPanelWidget* Parent, UWidget*
// I'm not sure ReplaceChildAt is designed to move children around (note: ShiftChild exists but again, editor-only)
TArray<UWidget*> WidgetsToReplaceReversed;
TArray<FMargin> HVBoxPadding;
// Keep slot padding info
HVBoxPadding.Reserve(OrigCount - AtIndex);
// Go backwards for consistency with below
const auto Slots = Parent->GetSlots();
for (int i = OrigCount - 1; i >= AtIndex; --i)
{
if (Slots.IsValidIndex(i))
{
const auto Slot = Slots[i];
if (const auto HSlot = Cast<UHorizontalBoxSlot>(Slot))
{
HVBoxPadding.Add(HSlot->GetPadding());
}
else if (const auto VSlot = Cast<UVerticalBoxSlot>(Slot))
{
HVBoxPadding.Add(VSlot->GetPadding());
}
else
{
HVBoxPadding.Add(FMargin());
}
}
}
WidgetsToReplaceReversed.Reserve(OrigCount - AtIndex);
// Go backwards so we can remove as we go and not remove from the middle
for (int i = OrigCount - 1; i >= AtIndex; --i)
@ -36,7 +64,21 @@ UPanelSlot* StevesUiHelpers::InsertChildWidgetAt(UPanelWidget* Parent, UWidget*
// add back previous, reverse order
for (int i = WidgetsToReplaceReversed.Num() - 1; i >= 0; --i)
{
Parent->AddChild(WidgetsToReplaceReversed[i]);
auto PrevSlot = Parent->AddChild(WidgetsToReplaceReversed[i]);
// Restore the padding on H/VBox slots
if (HVBoxPadding.IsValidIndex(i))
{
if (auto HSlot = Cast<UHorizontalBoxSlot>(PrevSlot))
{
HSlot->SetPadding(HVBoxPadding[i]);
}
else if (auto VSlot = Cast<UVerticalBoxSlot>(PrevSlot))
{
VSlot->SetPadding(HVBoxPadding[i]);
}
}
}
return Slot;