### XAML Theme Resource Dictionary Example

Source: https://context7.com/noesis/unrealplugin/llms.txt

An example of a XAML ResourceDictionary used for theming in NoesisGUI. It demonstrates merging other resource dictionaries for brushes, fonts, and styles, and shows how to use theme resources like dynamic brushes and static styles in custom XAML elements.

```xml
<!-- Example: Using NoesisTheme.DarkBlue.xaml as application resources -->
<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="NoesisTheme.Brushes.DarkBlue.xaml" />
        <ResourceDictionary Source="NoesisTheme.Fonts.xaml" />
        <ResourceDictionary Source="NoesisTheme.Styles.xaml" />
    </ResourceDictionary.MergedDictionaries>

</ResourceDictionary>

<!-- Example: Custom XAML using theme resources -->
<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
        <TextBlock Text="{Binding PlayerName}"
                   FontSize="24"
                   Foreground="{DynamicResource Brush.Foreground.Normal}"/>

        <Button Content="Start Game"
                Command="{Binding StartCommand}"
                Style="{StaticResource Button.Accent}"/>

        <ProgressBar Value="{Binding LoadProgress}"
                     Width="200"
                     Height="20"/>
    </StackPanel>

</Grid>
```

--------------------------------

### Setup 3D World Space UI with UNoesisWorldUIComponent

Source: https://context7.com/noesis/unrealplugin/llms.txt

Demonstrates how to create and configure a UNoesisWorldUIComponent to render XAML interfaces in 3D world space. This component can be attached to actors for in-game UI elements. It requires the NoesisWorldUIComponent header and utilizes functions for creating, attaching, configuring XAML, and setting data contexts.

```cpp
// Setting up 3D world-space UI
#include "NoesisWorldUIComponent.h"

void AMyCharacter::SetupWorldUI()
{
    // Create and attach world UI component
    UNoesisWorldUIComponent* WorldUI = NewObject<UNoesisWorldUIComponent>(this);
    WorldUI->SetupAttachment(GetMesh(), TEXT("HeadSocket"));
    WorldUI->RegisterComponent();

    // Configure XAML and display properties
    WorldUI->Xaml = LoadObject<UNoesisXaml>(
        nullptr,
        TEXT("/Game/UI/Widgets/HealthBar.HealthBar")
    );
    WorldUI->Scale = 0.5f;                    // Scale factor for world space
    WorldUI->Offset = FVector(0, 0, 100);     // Offset from attachment point
    WorldUI->Center = true;                    // Center the UI element

    // Set data context for bindings
    UCharacterStats* Stats = GetCharacterStats();
    WorldUI->SetDataContext(Stats);
}
```

--------------------------------

### Instantiate and Configure NoesisGUI Widgets in C++

Source: https://context7.com/noesis/unrealplugin/llms.txt

Demonstrates how to load a NoesisBlueprint, instantiate a UNoesisInstance widget, configure rendering properties, and bind a data context. This is the standard approach for displaying XAML-based UI elements in the Unreal viewport.

```cpp
#include "NoesisRuntime.h"

void AMyGameHUD::SetupNoesisUI()
{
    UNoesisBlueprint* NoesisBlueprint = LoadObject<UNoesisBlueprint>(
        nullptr,
        TEXT("/Game/UI/MainMenu_NoesisBlueprint")
    );

    if (NoesisBlueprint)
    {
        UNoesisInstance* NoesisWidget = CreateWidget<UNoesisInstance>(
            GetWorld(),
            NoesisBlueprint->GeneratedClass
        );

        NoesisWidget->EnablePPAA = true;
        NoesisWidget->DPIScale = true;
        NoesisWidget->TessellationQuality = ENoesisTessellationQuality::High;
        NoesisWidget->EnableKeyboard = true;
        NoesisWidget->EnableMouse = true;
        NoesisWidget->EnableTouch = true;

        NoesisWidget->InitInstance();
        NoesisWidget->AddToViewport();

        UMyGameDataContext* DataContext = NewObject<UMyGameDataContext>();
        NoesisWidget->SetDataContext(DataContext);
    }
}

void AMyGameHUD::UpdateUI()
{
    UObject* ButtonElement = NoesisWidget->FindName(TEXT("StartButton"));
    UObject* ResourceObj = NoesisWidget->FindResource(TEXT("MainBrush"));
}
```

--------------------------------

### Load and Manage XAML Assets at Runtime

Source: https://context7.com/noesis/unrealplugin/llms.txt

Shows how to load UNoesisXaml assets from the content browser and utilize the UNoesisFunctionLibrary to instantiate XAML elements and assign data contexts programmatically.

```cpp
#include "NoesisXaml.h"
#include "NoesisFunctionLibrary.h"

void AMyUIManager::LoadXamlAsset()
{
    UNoesisXaml* XamlAsset = LoadObject<UNoesisXaml>(
        nullptr,
        TEXT("/Game/UI/Widgets/InventoryPanel.InventoryPanel")
    );

    if (XamlAsset)
    {
        UObject* RootElement = UNoesisFunctionLibrary::LoadXaml(XamlAsset);

        UMyInventoryData* InventoryData = GetInventoryData();
        UNoesisFunctionLibrary::TrySetDataContext(RootElement, InventoryData);

        FString XamlUri = XamlAsset->GetXamlUri();
        UE_LOG(LogTemp, Log, TEXT("Loaded XAML: %s"), *XamlUri);
    }
}
```

--------------------------------

### Implement Command Pattern with CanExecute in C++

Source: https://context7.com/noesis/unrealplugin/llms.txt

This C++ code demonstrates the implementation of the command pattern with CanExecute functionality. It defines a view model class with command execution functions and their corresponding CanExecute checks. Data binding notifications are used to update UI elements when the conditions for command execution change.

```cpp
// Command pattern implementation with CanExecute
#include "NoesisFunctionLibrary.h"

UCLASS(BlueprintType)
class UGameMenuViewModel : public UObject
{
    GENERATED_BODY()

public:
    UPROPERTY(BlueprintReadOnly)
    bool bIsConnected = false;

    UPROPERTY(BlueprintReadOnly)
    bool bHasSaveGame = false;

    // Command execution functions (bound in XAML)
    UFUNCTION(BlueprintCallable)
    void StartGame()
    {
        // Start game logic
    }

    UFUNCTION(BlueprintCallable)
    bool CanStartGame()
    {
        return bIsConnected && bHasSaveGame;
    }

    UFUNCTION(BlueprintCallable)
    void LoadGame()
    {
        // Load game logic
    }

    UFUNCTION(BlueprintCallable)
    bool CanLoadGame()
    {
        return bHasSaveGame;
    }

    // Call when conditions change to update button states
    void SetConnected(bool bConnected)
    {
        bIsConnected = bConnected;
        // Notify that CanStartGame result may have changed
        UNoesisFunctionLibrary::NotifyCanExecuteFunctionChanged(this, GET_MEMBER_NAME_CHECKED(UGameMenuViewModel, StartGame));
    }

    void SetHasSaveGame(bool bHas)
    {
        bHasSaveGame = bHas;
        UNoesisFunctionLibrary::NotifyCanExecuteFunctionChanged(this, GET_MEMBER_NAME_CHECKED(UGameMenuViewModel, StartGame));
        UNoesisFunctionLibrary::NotifyCanExecuteFunctionChanged(this, GET_MEMBER_NAME_CHECKED(UGameMenuViewModel, LoadGame));
    }
};

```

--------------------------------

### Configure NoesisGUI Plugin Settings with UNoesisSettings

Source: https://context7.com/noesis/unrealplugin/llms.txt

Illustrates how to access and modify global NoesisGUI plugin settings using UNoesisSettings. This includes license configuration, default fonts, rendering options, and editor preferences. It requires the NoesisSettings header and uses functions to retrieve and apply settings.

```cpp
// Accessing and configuring NoesisGUI settings
#include "NoesisSettings.h"

void UMyGameInstance::ConfigureNoesis()
{
    // Get settings from Project Settings
    UNoesisSettings* Settings = GetMutableDefault<UNoesisSettings>();

    // License configuration (set in Project Settings > Plugins > NoesisGUI)
    // Settings->LicenseName = TEXT("YourLicenseName");
    // Settings->LicenseKey = TEXT("YourLicenseKey");

    // Set application-wide theme resources
    Settings->ApplicationResources = FSoftObjectPath(TEXT("/Game/UI/Theme/NoesisTheme.DarkBlue"));

    // Configure default font properties
    Settings->DefaultFontSize = 14.0f;
    Settings->DefaultFontWeight = ENoesisFontWeight::Normal;
    Settings->DefaultFontStyle = ENoesisFontStyle::Normal;
    Settings->LoadPlatformFonts = true;  // Load system fonts for unicode support

    // Rendering configuration
    Settings->GlyphTextureSize = ENoesisGlyphCacheDimensions::x2048;
    Settings->OffscreenTextureSampleCount = ENoesisOffscreenSampleCount::Four;
    Settings->OffscreenInitSurfaces = 2;
    Settings->OffscreenMaxSurfaces = 8;

    // Editor settings
    Settings->GeneralLogLevel = ENoesisLoggingSettings::Warning;
    Settings->BindingLogLevel = ENoesisLoggingSettings::Warning;
    Settings->ReloadEnabled = true;  // Hot reload in editor

    // Apply settings
    Settings->SetLicense();
    Settings->SetApplicationResources();
    Settings->SetFontFallbacks();
    Settings->SetFontDefaultProperties();
}
```

--------------------------------

### Implement BackgroundImage extension for UI effects

Source: https://context7.com/noesis/unrealplugin/llms.txt

This extension enables UI elements to display the game viewport as a texture, facilitating effects like background blurring. It requires C++ code to capture the viewport render target and XAML markup to apply the texture to UI brushes.

```cpp
#include "Extensions/BackgroundImage.h"

void AMyGameMode::SetupBackgroundCapture()
{
    FViewport* Viewport = GEngine->GameViewport->Viewport;
    FRHITexture* BackBuffer = Viewport->GetRenderTargetTexture();

    BackgroundImage::SetBackgroundImageTexture(BackBuffer);
    BackgroundImage::SetBackgroundImageSize(Viewport->GetSizeXY());
}
```

```xml
<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:noesis="clr-namespace:NoesisGUIExtensions;assembly=NoesisGUI.Extensions">

    <Rectangle>
        <Rectangle.Fill>
            <ImageBrush ImageSource="{noesis:BackgroundImage}">
                <ImageBrush.RelativeTransform>
                    <ScaleTransform ScaleX="1" ScaleY="-1" CenterY="0.5"/>
                </ImageBrush.RelativeTransform>
            </ImageBrush>
        </Rectangle.Fill>
        <Rectangle.Effect>
            <BlurEffect Radius="10"/>
        </Rectangle.Effect>
    </Rectangle>

    <Border Background="#80000000" Padding="20">
        <TextBlock Text="Paused" FontSize="48"/>
    </Border>

</Grid>
```

--------------------------------

### Localize text with LocText extension in XAML

Source: https://context7.com/noesis/unrealplugin/llms.txt

The LocText markup extension allows developers to bind UI text directly to Unreal Engine's localization system. It requires specifying the Namespace and Key, with an optional Source table, to retrieve localized strings at runtime.

```xml
<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:noesis="clr-namespace:NoesisGUIExtensions;assembly=NoesisGUI.Extensions">

    <StackPanel>
        <TextBlock Text="{noesis:LocText Namespace=Game, Key=MainMenu_Title}"/>
        <TextBlock Text="{noesis:LocText Key=StartButton_Label, Source=UIStrings}"/>
        <Button Content="{noesis:LocText Key=Settings_Button}"/>
    </StackPanel>

</UserControl>
```

--------------------------------

### Perform Type Conversions Between Unreal and Noesis

Source: https://context7.com/noesis/unrealplugin/llms.txt

Provides methods for converting Unreal Engine objects, structs, and enums into Noesis components for XAML binding, and vice versa. Also demonstrates how to register custom type conversions for specialized classes.

```cpp
#include "NoesisTypeClass.h"

void AMyActor::SetupNoesisBindings()
{
    UMyDataModel* DataModel = NewObject<UMyDataModel>();
    Noesis::Ptr<Noesis::BaseComponent> NoesisComponent = NoesisCreateComponentForUObject(DataModel);

    FMyCustomStruct MyStruct;
    MyStruct.Value = 42;
    Noesis::Ptr<Noesis::BaseComponent> BoxedStruct = NoesisCreateComponentForUStruct(&MyStruct);

    UEnum* MyEnumType = StaticEnum<EMyGameState>();
    Noesis::Ptr<Noesis::BaseComponent> EnumComponent = NoesisCreateComponentForUEnum(
        MyEnumType,
        static_cast<int64>(EMyGameState::Playing)
    );

    UObject* UnrealObject = NoesisCreateUObjectForComponent(NoesisComponent.GetPtr());
    FMyCustomStruct ExtractedStruct = NoesisGetUStructFromComponent<FMyCustomStruct>(BoxedStruct.GetPtr());
}

void UMyGameInstance::Init()
{
    Super::Init();
    NoesisRegisterClassConversion(
        UMyCustomWidget::StaticClass(),
        Noesis::TypeOf<MyNoesisWidget>(),
        [](UObject* Obj) -> Noesis::Ptr<Noesis::BaseComponent> {
            return NoesisCreateComponentForUObject(Obj);
        },
        [](Noesis::BaseComponent* Comp) -> UObject* {
            return NoesisCreateUObjectForComponent(Comp);
        }
    );
}
```

--------------------------------

### Implement MVVM Property Change Notifications in C++

Source: https://context7.com/noesis/unrealplugin/llms.txt

Demonstrates how to use UNoesisFunctionLibrary to notify the UI of property, array, and map changes within a ViewModel. This ensures that data-bound XAML elements automatically reflect updates made to the underlying C++ data structures.

```cpp
#include "NoesisFunctionLibrary.h"

UCLASS(BlueprintType)
class UPlayerViewModel : public UObject
{
    GENERATED_BODY()

public:
    UPROPERTY(BlueprintReadWrite)
    FString PlayerName;

    UPROPERTY(BlueprintReadWrite)
    int32 Health;

    UPROPERTY(BlueprintReadWrite)
    TArray<UObject*> Inventory;

    UPROPERTY(BlueprintReadWrite)
    TMap<FString, int32> Stats;

    UFUNCTION(BlueprintCallable)
    void SetPlayerName(const FString& NewName)
    {
        PlayerName = NewName;
        UNoesisFunctionLibrary::NotifyChanged(this, GET_MEMBER_NAME_CHECKED(UPlayerViewModel, PlayerName));
    }

    UFUNCTION(BlueprintCallable)
    void SetHealth(int32 NewHealth)
    {
        Health = NewHealth;
        UNoesisFunctionLibrary::NotifyChanged(this, GET_MEMBER_NAME_CHECKED(UPlayerViewModel, Health));
    }

    UFUNCTION(BlueprintCallable)
    void AddInventoryItem(UObject* Item)
    {
        Inventory.Add(Item);
        UNoesisFunctionLibrary::NotifyArrayChanged(this, GET_MEMBER_NAME_CHECKED(UPlayerViewModel, Inventory));
    }

    UFUNCTION(BlueprintCallable)
    void UpdateStat(const FString& StatName, int32 Value)
    {
        Stats.Add(StatName, Value);
        UNoesisFunctionLibrary::NotifyMapChanged(this, GET_MEMBER_NAME_CHECKED(UPlayerViewModel, Stats));
    }
};
```

--------------------------------

### Bind Commands with CanExecute in XAML

Source: https://context7.com/noesis/unrealplugin/llms.txt

This XAML code demonstrates how to bind UI elements, specifically buttons, to commands defined in a view model. The `IsEnabled` property of the buttons is bound to the corresponding `CanExecute` functions, ensuring that buttons are only enabled when the command can be executed.

```xml
<!-- XAML using commands with CanExecute -->
<StackPanel>
    <Button Content="Start Game"
            Command="{Binding StartGame}"
            IsEnabled="{Binding CanStartGame}"/>

    <Button Content="Load Game"
            Command="{Binding LoadGame}"
            IsEnabled="{Binding CanLoadGame}"/>
</StackPanel>

```

--------------------------------

### Configure UNoesisBlueprint for UI rendering

Source: https://context7.com/noesis/unrealplugin/llms.txt

The UNoesisBlueprint class manages the configuration for NoesisGUI views. It controls rendering quality settings like PPAA and tessellation, as well as input handling preferences such as keyboard, mouse, and touch interaction.

```cpp
#include "NoesisBlueprint.h"

void SetupNoesisBlueprint()
{
    UNoesisBlueprint* Blueprint;
    Blueprint->BaseXaml;
    Blueprint->EnablePPAA = true;
    Blueprint->DPIScale = true;
    Blueprint->TessellationQuality = ENoesisTessellationQuality::High;
    Blueprint->EnableKeyboard = true;
    Blueprint->EnableMouse = true;
    Blueprint->EmulateTouch = false;
    Blueprint->SetUserFocusToViewport = true;
    Blueprint->EnableTouch = true;
    Blueprint->EnableActions = true;
    Blueprint->PixelDepthBias = 0.0f;
}
```

--------------------------------

### Manage Fine-Grained Array Change Notifications

Source: https://context7.com/noesis/unrealplugin/llms.txt

Utilizes NoesisTypeClass functions to manually trigger UI updates for specific array operations like adding, inserting, removing, or resetting items. This is necessary for complex collection management where automatic detection may not suffice.

```cpp
#include "NoesisTypeClass.h"

void UInventoryManager::ManageInventory()
{
    Items.Add(NewItem);
    NoesisNotifyArrayPropertyPostAdd(&Items);

    NoesisNotifyArrayPropertyPreAppend(&Items);
    Items.Append(NewItems);
    NoesisNotifyArrayPropertyPostAppend(&Items);

    Items.Insert(NewItem, InsertIndex);
    NoesisNotifyArrayPropertyPostInsert(&Items, InsertIndex);

    NoesisNotifyArrayPropertyPreRemove(&Items, RemoveIndex);
    Items.RemoveAt(RemoveIndex);
    NoesisNotifyArrayPropertyPostRemove(&Items, RemoveIndex);

    NoesisNotifyArrayPropertyPreSet(&Items, ModifyIndex);
    Items[ModifyIndex] = ModifiedItem;
    NoesisNotifyArrayPropertyPostSet(&Items, ModifyIndex);

    Items.Empty();
    Items = NewItemList;
    NoesisNotifyArrayPropertyPostReset(&Items);
}
```

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