int32 SFlipbookTimeline::OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const
{
LayerId = SCompoundWidget::OnPaint(Args, AllottedGeometry, MyClippingRect, OutDrawElements, LayerId, InWidgetStyle, bParentEnabled);
const float CurrentTimeSecs = PlayTime.Get();
UPaperFlipbook* Flipbook = FlipbookBeingEdited.Get();
const float TotalTimeSecs = (Flipbook != nullptr) ? Flipbook->GetTotalDuration() : 0.0f;
const int32 TotalNumFrames = (Flipbook != nullptr) ? Flipbook->GetNumFrames() : 0;
const float SlateTotalDistance = SlateUnitsPerFrame * TotalNumFrames;
const float CurrentTimeXPos = (CurrentTimeSecs / TotalTimeSecs) * SlateTotalDistance;
// Draw a line for the current scrub cursor
++LayerId;
TArray<FVector2D> LinePoints;
LinePoints.Add(FVector2D(CurrentTimeXPos, 0.f));
LinePoints.Add(FVector2D(CurrentTimeXPos, AllottedGeometry.Size.Y));
FSlateDrawElement::MakeLines(
OutDrawElements,
LayerId,
AllottedGeometry.ToPaintGeometry(),
LinePoints,
MyClippingRect,
ESlateDrawEffect::None,
FLinearColor::Red
);
return LayerId;
}
void SFlipbookTimeline::CheckForRebuild(bool bRebuildAll)
{
UPaperFlipbook* Flipbook = FlipbookBeingEdited.Get();
const int32 NewNumKeyframes = (Flipbook != nullptr) ? Flipbook->GetNumKeyFrames() : 0;
if ((NewNumKeyframes != NumKeyFramesFromLastRebuild) || bRebuildAll)
{
NumKeyFramesFromLastRebuild = NewNumKeyframes;
TimelineTrack->Rebuild();
}
const int32 NewNumFrames = (Flipbook != nullptr) ? Flipbook->GetNumFrames() : 0;
if ((NewNumFrames != NumFramesFromLastRebuild) || bRebuildAll)
{
NumFramesFromLastRebuild = NewNumFrames;
TimelineHeader->Rebuild();
RebuildPerFrameBG();
}
}
EVisibility SFlipbookTimeline::NoFramesWarningVisibility() const
{
UPaperFlipbook* Flipbook = FlipbookBeingEdited.Get();
const int32 TotalNumFrames = (Flipbook != nullptr) ? Flipbook->GetNumFrames() : 0;
return (TotalNumFrames == 0) ? EVisibility::Visible : EVisibility::Collapsed;
}
void SFlipbookTimeline::Construct(const FArguments& InArgs, TSharedPtr<FUICommandList> InCommandList)
{
FlipbookBeingEdited = InArgs._FlipbookBeingEdited;
PlayTime = InArgs._PlayTime;
OnSelectionChanged = InArgs._OnSelectionChanged;
CommandList = InCommandList;
SlateUnitsPerFrame = 120.0f;
BackgroundPerFrameSlices = SNew(SHorizontalBox);
TimelineHeader = SNew(STimelineHeader)
.SlateUnitsPerFrame(this, &SFlipbookTimeline::GetSlateUnitsPerFrame)
.FlipbookBeingEdited(FlipbookBeingEdited)
.PlayTime(PlayTime);
TimelineTrack = SNew(SFlipbookTimelineTrack, CommandList)
.SlateUnitsPerFrame(this, &SFlipbookTimeline::GetSlateUnitsPerFrame)
.FlipbookBeingEdited(FlipbookBeingEdited)
.OnSelectionChanged(OnSelectionChanged);
ChildSlot
[
SNew(SBorder)
.BorderImage( FEditorStyle::GetBrush("ToolPanel.GroupBorder") )
[
SNew(SScrollBox)
.Orientation(Orient_Horizontal)
.ScrollBarAlwaysVisible(true)
+SScrollBox::Slot()
[
SNew(SOverlay)
// Per-frame background
+SOverlay::Slot()
.VAlign(VAlign_Fill)
[
BackgroundPerFrameSlices.ToSharedRef()
]
// Flipbook header and track
+SOverlay::Slot()
[
SNew(SVerticalBox)
+SVerticalBox::Slot()
.AutoHeight()
.Padding(0,0,0,2)
[
TimelineHeader.ToSharedRef()
]
+SVerticalBox::Slot()
.AutoHeight()
[
SNew(SBox)
.HeightOverride(FFlipbookUIConstants::FrameHeight)
[
TimelineTrack.ToSharedRef()
]
]
]
// Empty flipbook instructions
+ SOverlay::Slot()
.VAlign(VAlign_Center)
.HAlign(HAlign_Center)
[
SNew(STextBlock)
.Visibility(this, &SFlipbookTimeline::NoFramesWarningVisibility)
.Text(LOCTEXT("EmptyTimelineInstruction", "Right-click here or drop in sprites to add key frames"))
]
]
]
];
UPaperFlipbook* Flipbook = FlipbookBeingEdited.Get();
NumKeyFramesFromLastRebuild = (Flipbook != nullptr) ? Flipbook->GetNumKeyFrames() : 0;
NumFramesFromLastRebuild = (Flipbook != nullptr) ? Flipbook->GetNumFrames() : 0;
RebuildPerFrameBG();
}