EActiveTimerReturnType UpdateScrollerState(double InCurrentTime, float InDeltaTime)
{
if (ScrollerState == EScrollerState::Stop_Wait)
{
TimeElapsed = 0.0f;
ScrollerState = EScrollerState::FadeOff;
ScrollBox->SetScrollOffset(ScrollOffset);
auto PinnedActiveTimerHandle = ActiveTimerHandle.Pin();
if (PinnedActiveTimerHandle.IsValid())
{
UnRegisterActiveTimer(PinnedActiveTimerHandle.ToSharedRef());
}
ActiveTimerHandle = RegisterActiveTimer(0, FWidgetActiveTimerDelegate::CreateSP(this, &SAutoTextScrollerImpl::UpdateScrollerState));
}
else if (ScrollerState == EScrollerState::Start_Wait)
{
TimeElapsed = 0.0f;
ScrollOffset = 0.0f;
ScrollerState = EScrollerState::Scrolling;
ScrollBox->SetScrollOffset(ScrollOffset);
auto PinnedActiveTimerHandle = ActiveTimerHandle.Pin();
if (PinnedActiveTimerHandle.IsValid())
{
UnRegisterActiveTimer(PinnedActiveTimerHandle.ToSharedRef());
}
ActiveTimerHandle = RegisterActiveTimer(0, FWidgetActiveTimerDelegate::CreateSP(this, &SAutoTextScrollerImpl::UpdateScrollerState));
}
return EActiveTimerReturnType::Continue;
}
FReply SInlineEditableTextBlock::OnMouseButtonDoubleClick( const FGeometry& InMyGeometry, const FPointerEvent& InMouseEvent )
{
auto PinnedActiveTimerHandle = ActiveTimerHandle.Pin();
if (PinnedActiveTimerHandle.IsValid())
{
UnRegisterActiveTimer(PinnedActiveTimerHandle.ToSharedRef());
}
return FReply::Unhandled();
}
FReply SInlineEditableTextBlock::OnDragOver( const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent )
{
// Cancel during a drag over event, otherwise the widget may enter edit mode.
auto PinnedActiveTimerHandle = ActiveTimerHandle.Pin();
if (PinnedActiveTimerHandle.IsValid())
{
UnRegisterActiveTimer(PinnedActiveTimerHandle.ToSharedRef());
}
return FReply::Unhandled();
}
void SCreditsScreen::HandleUserScrolled(float ScrollOffset)
{
// If the user scrolls up, and we're currently playing, then stop playing.
if ( bIsPlaying && ScrollOffset < PreviousScrollPosition )
{
bIsPlaying = false;
if ( ActiveTimerHandle.IsValid() )
{
UnRegisterActiveTimer( ActiveTimerHandle.Pin().ToSharedRef() );
}
}
PreviousScrollPosition = ScrollOffset;
}
void SProgressBar::SetActiveTimerTickRate(float TickRate)
{
if (CurrentTickRate != TickRate || !ActiveTimerHandle.IsValid())
{
CurrentTickRate = TickRate;
TSharedPtr<FActiveTimerHandle> SharedActiveTimerHandle = ActiveTimerHandle.Pin();
if (SharedActiveTimerHandle.IsValid())
{
UnRegisterActiveTimer(SharedActiveTimerHandle.ToSharedRef());
}
ActiveTimerHandle = RegisterActiveTimer(TickRate, FWidgetActiveTimerDelegate::CreateSP(this, &SProgressBar::ActiveTick));
}
}
void SEditorViewport::OnToggleRealtime()
{
if (Client->IsRealtime())
{
Client->SetRealtime( false );
if ( ActiveTimerHandle.IsValid() )
{
UnRegisterActiveTimer( ActiveTimerHandle.Pin().ToSharedRef() );
}
}
else
{
Client->SetRealtime( true );
ActiveTimerHandle = RegisterActiveTimer( 0.f, FWidgetActiveTimerDelegate::CreateSP( this, &SEditorViewport::EnsureTick ) );
}
}
FReply SCreditsScreen::HandleTogglePlayPause()
{
if ( bIsPlaying )
{
bIsPlaying = false;
if ( ActiveTimerHandle.IsValid() )
{
UnRegisterActiveTimer( ActiveTimerHandle.Pin().ToSharedRef() );
}
}
else
{
bIsPlaying = true;
if ( !ActiveTimerHandle.IsValid() )
{
ActiveTimerHandle = RegisterActiveTimer( 0.f, FWidgetActiveTimerDelegate::CreateSP( this, &SCreditsScreen::RollCredits ) );
}
}
return FReply::Handled();
}
virtual void Tick(const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime) override
{
const float ContentSize = ScrollBox->GetDesiredSize().X;
const float Speed = 20.0f;
const float StartDelay = 2.0f;
const float EndDelay = 2.0f;
const float FadeOnDelay = 0.5f;
const float FadeOffDelay = 0.5f;
TimeElapsed += InDeltaTime;
switch (ScrollerState)
{
case EScrollerState::FadeOn:
{
FontAlpha = TimeElapsed / FadeOnDelay;
if (TimeElapsed >= FadeOnDelay)
{
FontAlpha = 1.0f;
TimeElapsed = 0.0f;
ScrollOffset = 0.0f;
ScrollerState = EScrollerState::Start;
}
}break;
case EScrollerState::Start:
{
// Unregister Tick Delegate
auto PinnedActiveTimerHandle = ActiveTimerHandle.Pin();
if (PinnedActiveTimerHandle.IsValid())
{
UnRegisterActiveTimer(PinnedActiveTimerHandle.ToSharedRef());
}
// Check to see if we need to scroll
if (ExternalScrollbar->DistanceFromBottom() == 0.0f && ExternalScrollbar->DistanceFromTop() == 0.0f)
{
// Don't run auto scrolling if text already fits.
break;
}
else
{
ActiveTimerHandle = RegisterActiveTimer(StartDelay, FWidgetActiveTimerDelegate::CreateSP(this, &SAutoTextScrollerImpl::UpdateScrollerState));
ScrollerState = EScrollerState::Start_Wait;
}
}break;
case EScrollerState::Start_Wait:
break;
case EScrollerState::Scrolling:
{
ScrollOffset += Speed * InDeltaTime;
if (ExternalScrollbar->DistanceFromBottom()==0.0f)
{
ScrollOffset = ContentSize;
TimeElapsed = 0.0f;
ScrollerState = EScrollerState::Stop;
}
}break;
case EScrollerState::Stop:
{
// Unregister Tick Delegate
auto PinnedActiveTimerHandle = ActiveTimerHandle.Pin();
if (PinnedActiveTimerHandle.IsValid())
{
UnRegisterActiveTimer(PinnedActiveTimerHandle.ToSharedRef());
}
// Check to see if we need to scroll
if (ExternalScrollbar->DistanceFromBottom() == 0.0f && ExternalScrollbar->DistanceFromTop() == 0.0f)
{
// Don't run auto scrolling if text already fits.
break;
}
else
{
ActiveTimerHandle = RegisterActiveTimer(EndDelay, FWidgetActiveTimerDelegate::CreateSP(this, &SAutoTextScrollerImpl::UpdateScrollerState));
ScrollerState = EScrollerState::Stop_Wait;
}
}break;
case EScrollerState::Stop_Wait:
break;
case EScrollerState::FadeOff:
{
FontAlpha = 1.0f - TimeElapsed / FadeOffDelay;
if (TimeElapsed >= FadeOffDelay)
{
FontAlpha = 0.0f;
TimeElapsed = 0.0f;
ScrollOffset = 0.0f;
ScrollerState = EScrollerState::FadeOn;
}
}break;
};
ScrollBox->SetScrollOffset(ScrollOffset);
}
