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Improve the checking for game in foreground

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Instead of checking every imput event, check every 0.5s. Also expose the foregrounded boolean, and raise an event so other code can use this.
This commit is contained in:
Steve Streeting 2021-04-29 12:28:27 +01:00
parent a466ce6a71
commit 510423abfe
2 changed files with 44 additions and 13 deletions
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38
Source/StevesUEHelpers/Private/StevesGameSubsystem.cpp
View File

@ -15,7 +15,8 @@ void UStevesGameSubsystem::Initialize(FSubsystemCollectionBase& Collection)
{
Super::Initialize(Collection);
CreateInputDetector();
InitTheme();
InitTheme();
InitForegroundCheck();
}
void UStevesGameSubsystem::Deinitialize()
@ -51,6 +52,30 @@ void UStevesGameSubsystem::InitTheme()
DefaultUiTheme = LoadObject<UUiTheme>(nullptr, *DefaultUiThemePath, nullptr);
}
void UStevesGameSubsystem::InitForegroundCheck()
{
// Check foreground status every 0.5 seconds
GetWorld()->GetTimerManager().SetTimer(ForegroundCheckHandle, this, &UStevesGameSubsystem::CheckForeground, 0.5);
}
void UStevesGameSubsystem::CheckForeground()
{
bool bNewForeground = bIsForeground;
if (IsValid(GEngine) && IsValid(GEngine->GameViewport) && GEngine->GameViewport->Viewport)
bNewForeground = GEngine->GameViewport->Viewport->IsForegroundWindow();
if (bNewForeground != bIsForeground)
{
bIsForeground = bNewForeground;
InputDetector->bIgnoreEvents = !bIsForeground;
OnWindowForegroundChanged.Broadcast(bIsForeground);
}
}
void UStevesGameSubsystem::OnInputDetectorModeChanged(int PlayerIndex, EInputMode NewMode)
{
// We can't check this during Initialize because it's too early
@ -221,16 +246,7 @@ void UStevesGameSubsystem::SetBrushFromAtlas(FSlateBrush* Brush, TScriptInterfac
bool UStevesGameSubsystem::FInputModeDetector::ShouldProcessInputEvents() const
{
if (!bProcessEventsInBackground)
{
if (IsValid(GEngine) && IsValid(GEngine->GameViewport) && GEngine->GameViewport->Viewport)
return GEngine->GameViewport->Viewport->IsForegroundWindow();
// If we're not supposed to process in the background but there's no viewport, don't process
return false;
}
return true;
return !bIgnoreEvents;
}
UStevesGameSubsystem::FInputModeDetector::FInputModeDetector()

19
Source/StevesUEHelpers/Public/StevesGameSubsystem.h
View File

@ -12,6 +12,7 @@
#include "StevesGameSubsystem.generated.h"
DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnInputModeChanged, int, PlayerIndex, EInputMode, InputMode);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnWindowForegroundChanged, bool, bFocussed);
UCLASS(Config=Game)
class STEVESUEHELPERS_API UStevesGameSubsystem : public UGameInstanceSubsystem
@ -68,8 +69,8 @@ protected:
bool ShouldProcessInputEvents() const;
public:
/// Whether this detector should process events when the application is in the background
bool bProcessEventsInBackground = false;
/// Whether this detector should ignore events (e.g. because the application is in the background)
bool bIgnoreEvents = false;
// Single delegate caller, owner should propagate if they want (this isn't a UObject)
FInternalInputModeChanged OnInputModeChanged;
@ -100,12 +101,20 @@ protected:
FFocusSystem FocusSystem;
bool bCheckedViewportClient = false;
FTimerHandle ForegroundCheckHandle;
UPROPERTY(BlueprintReadOnly)
bool bIsForeground = true;
UPROPERTY(BlueprintReadWrite)
UUiTheme* DefaultUiTheme;
void CreateInputDetector();
void DestroyInputDetector();
void InitTheme();
void InitForegroundCheck();
void CheckForeground();
// Called by detector
void OnInputDetectorModeChanged(int PlayerIndex, EInputMode NewMode);
@ -118,6 +127,10 @@ public:
UPROPERTY(BlueprintAssignable)
FOnInputModeChanged OnInputModeChanged;
/// Event raised when the game window's foreground status changes
UPROPERTY(BlueprintAssignable)
FOnWindowForegroundChanged OnWindowForegroundChanged;
UFUNCTION(BlueprintCallable)
EInputMode GetLastInputModeUsed(int PlayerIndex = 0) const { return InputDetector->GetLastInputMode(PlayerIndex); }
@ -134,6 +147,8 @@ public:
/// Get the global focus system
FFocusSystem* GetFocusSystem();
/// Return whether the game is currently in the foreground
bool IsForeground() const { return bIsForeground; }
/**
* @brief Get an input button / key / axis image as a sprite based on any combination of action / axis binding or manual key