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Copying //Tasks/UE5/Dev-SequencerMVVM2 to Main (//UE5/Main) @20364093 #preflight 628866dfb94f739b152c1e29 #preflight 628866e4585e8f793ee80943 #rb ludovic.chabant, andrew.rodham #fyi ludovic.chabant, andrew.rodham, andrew.porter #jira UE-105322 [CL 20364493 by Max Chen in ue5-main branch]
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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struct FGeometry;
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namespace UE
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{
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namespace Sequencer
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{
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class FViewModel;
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class FChannelModel;
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class FSectionModel;
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class FTrackModel;
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/** A layout element specifying the geometry required to render a key area */
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struct FSectionLayoutElement
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{
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/** Whether this layout element pertains to one or multiple key areas */
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enum EType { Single, Group };
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/** Construct this element from a grouped key area */
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static FSectionLayoutElement FromGroup(const TSharedPtr<FViewModel>& InGroup, const TSharedPtr<FViewModel>& InChannelRoot, float InOffset, float InHeight);
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/** Construct this element from a single Key area node */
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static FSectionLayoutElement FromChannel(const TSharedPtr<FChannelModel>& InChannel, float InOffset, float InHeight);
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/** Construct this element from a single Key area node */
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static FSectionLayoutElement EmptySpace(const TSharedPtr<FViewModel>& InNode, float InOffset, float InHeight);
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/** Retrieve the type of this layout element */
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EType GetType() const;
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/** Retrieve vertical offset from the top of this element's parent */
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float GetOffset() const;
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/** Retrieve the desired height of this element based on the specified parent geometry */
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float GetHeight() const;
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/** Access all the key areas that this layout element represents */
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TArrayView<const TWeakPtr<FChannelModel>> GetChannels() const;
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/** Access the display node that this layout element was generated for */
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TSharedPtr<FViewModel> GetModel() const;
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/** Computes the geometry for this layout as a child of the specified section area geometry */
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FGeometry ComputeGeometry(const FGeometry& SectionAreaGeometry) const;
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private:
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/** Pointer to the key area that we were generated from */
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TArray<TWeakPtr<FChannelModel>, TInlineAllocator<1>> WeakChannels;
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/** The specific node that this key area relates to */
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TWeakPtr<FViewModel> DataModel;
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/** The type of this layout element */
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EType Type;
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/** The vertical offset from the top of the element's parent */
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float LocalOffset;
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/** Explicit height of the layout element */
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float Height;
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};
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/** Class used for generating, and caching the layout geometry for a given display node's key areas */
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class FSectionLayout
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{
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public:
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/** Constructor that takes a display node, and the index of the section to layout */
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FSectionLayout(TSharedPtr<UE::Sequencer::FSectionModel> SectionModel);
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/** Get all layout elements that we generated */
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const TArray<FSectionLayoutElement>& GetElements() const;
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/** Get the desired total height of this layout */
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float GetTotalHeight() const;
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private:
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/** Array of layout elements that we generated */
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TArray<FSectionLayoutElement> Elements;
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float Height;
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};
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/** Key funcs for using a section layout element as a key. Intentionally not supported implicitly due to performance reasons. */
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struct FSectionLayoutElementKeyFuncs
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{
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template<typename T>
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static const FSectionLayoutElement& GetSetKey(const TPair<FSectionLayoutElement, T>& Element)
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{
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return Element.Key;
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}
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static bool Matches(const FSectionLayoutElement& A, const FSectionLayoutElement& B);
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static uint32 GetKeyHash(const FSectionLayoutElement& Key);
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};
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} // namespace Sequencer
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} // namespace UE
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