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8153258c0d
Expose WidgetStyle for List/Tree Views. #rb Matt.Kuhlenschmidt #jira UE-116125 #fyi Brian.White #preflight 60a592480569f30001f9fd28 [CL 16421640 by daren cheng in ue5-main branch]
123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Components/TreeView.h"
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#include "Styling/UMGCoreStyle.h"
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/////////////////////////////////////////////////////
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// UTreeView
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static FTableViewStyle* DefaultTreeViewStyle = nullptr;
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#if WITH_EDITOR
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static FTableViewStyle* EditorTreeViewStyle = nullptr;
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#endif
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UTreeView::UTreeView(const FObjectInitializer& ObjectInitializer)
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: Super(ObjectInitializer)
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{
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if (DefaultTreeViewStyle == nullptr)
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{
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DefaultTreeViewStyle = new FTableViewStyle(FUMGCoreStyle::Get().GetWidgetStyle<FTableViewStyle>("TreeView"));
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// Unlink UMG default colors.
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DefaultTreeViewStyle->UnlinkColors();
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}
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WidgetStyle = *DefaultTreeViewStyle;
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#if WITH_EDITOR
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if (EditorTreeViewStyle == nullptr)
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{
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EditorTreeViewStyle = new FTableViewStyle(FAppStyle::Get().GetWidgetStyle<FTableViewStyle>("TreeView"));
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// Unlink UMG default colors.
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EditorTreeViewStyle->UnlinkColors();
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}
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if (IsEditorWidget())
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{
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WidgetStyle = *EditorTreeViewStyle;
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}
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#endif // WITH_EDITOR
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}
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TSharedRef<STableViewBase> UTreeView::RebuildListWidget()
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{
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return ConstructTreeView<STreeView>();
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}
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void UTreeView::OnItemExpansionChangedInternal(UObject* Item, bool bIsExpanded)
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{
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BP_OnItemExpansionChanged.Broadcast(Item, bIsExpanded);
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}
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void UTreeView::OnGetChildrenInternal(UObject* Item, TArray<UObject*>& OutChildren) const
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{
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#if WITH_EDITORONLY_DATA
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//@todo DanH TreeView: Ideally it'd be nice to support previewing children/nesting in some way
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if (!IsDesignTime())
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#endif
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{
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if (OnGetItemChildren.IsBound())
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{
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OnGetItemChildren.Execute(Item, OutChildren);
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}
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else if (BP_OnGetItemChildren.IsBound())
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{
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BP_OnGetItemChildren.Execute(Item, OutChildren);
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}
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}
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}
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void UTreeView::ReleaseSlateResources(bool bReleaseChildren)
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{
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Super::ReleaseSlateResources(bReleaseChildren);
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MyTreeView.Reset();
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}
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void UTreeView::SetItemExpansion(UObject* Item, bool bExpandItem)
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{
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if (MyTreeView.IsValid())
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{
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MyTreeView->SetItemExpansion(Item, bExpandItem);
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}
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}
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void UTreeView::ExpandAll()
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{
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if (MyTreeView.IsValid())
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{
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//@todo DanH TreeView: Recursive expansion - as written this will only expand the root items
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for (UObject* ListItem : GetListItems())
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{
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MyTreeView->SetItemExpansion(ListItem, true);
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}
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}
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}
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void UTreeView::CollapseAll()
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{
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if (MyTreeView.IsValid())
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{
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MyTreeView->ClearExpandedItems();
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}
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}
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void UTreeView::OnItemClickedInternal(UObject* ListItem)
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{
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// If the clicked item has children, expand it now as part of the click
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if (ensure(MyTreeView.IsValid()))
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{
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// The item was clicked, implying that there should certainly be a widget representing this item right now
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TSharedPtr<ITableRow> RowWidget = MyTreeView->WidgetFromItem(ListItem);
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if (ensure(RowWidget.IsValid()) && RowWidget->DoesItemHaveChildren() > 0)
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{
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const bool bNewExpansionState = !MyTreeView->IsItemExpanded(ListItem);
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MyTreeView->SetItemExpansion(ListItem, bNewExpansionState);
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}
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}
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Super::OnItemClickedInternal(ListItem);
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}
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/////////////////////////////////////////////////////
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