MessageComposerWidget.h

// Copyright 2026 Stream.IO, Inc. All Rights Reserved.
 
#pragma once
 
#include "AttachmentPicker.h"
#include "Blueprint/UserWidget.h"
#include "Channel/ChatChannel.h"
#include "Common/IconButton.h"
#include "Components/Border.h"
#include "Components/Button.h"
#include "Components/Image.h"
#include "Components/TextBlock.h"
#include "CoreMinimal.h"
#include "MessageInputWidget.h"
#include "Types/SlateEnums.h"
 
#include "MessageComposerWidget.generated.h"
 
UCLASS()
class STREAMCHATUI_API UMessageComposerWidget final : public UUserWidget
{
    GENERATED_BODY()
 
public:
    virtual void NativeOnInitialized() override;
    virtual void NativeConstruct() override;
    virtual void NativeDestruct() override;
 
    DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnSendMessage, const FString&, MessageText);
    UPROPERTY(BlueprintAssignable)
    FOnSendMessage OnSendMessage;
 
    UFUNCTION(BlueprintCallable, Category = "Stream Chat")
    void EditMessage(const FMessage& Message);
 
    UFUNCTION()
    void OnThreadChanged(bool bThreadOpen, const FMessage& ParentMessage);
 
protected:
    UPROPERTY(meta = (BindWidget))
    UMessageInputWidget* MessageInput;
 
    UPROPERTY(meta = (BindWidget))
    UIconButton* SendMessageButton;
 
    UPROPERTY(meta = (BindWidget))
    UButton* CancelEditingButton;
 
    UPROPERTY(meta = (BindWidget))
    UPanelWidget* CancelEditingHeaderPanel;
 
    UPROPERTY(meta = (BindWidget))
    UTextBlock* EditMessageTextBlock;
 
    UPROPERTY(meta = (BindWidget))
    UBorder* BackgroundBorder;
 
    UPROPERTY(meta = (BindWidget))
    UImage* TopBorderImage;
 
    UPROPERTY(EditAnywhere, Category = "Icon")
    UTexture2D* IconTextureSend;
 
    UPROPERTY(EditAnywhere, Category = "Icon")
    UTexture2D* IconTextureConfirm;
 
    UPROPERTY(EditAnywhere, Category = "Icon")
    FMargin IconPaddingSend;
 
    UPROPERTY(EditAnywhere, Category = "Icon")
    FMargin IconPaddingConfirm;
 
    UPROPERTY(EditAnywhere, Category = "Icon")
    UTexture2D* IconTextureAttach;
 
    UPROPERTY(EditAnywhere, Category = "Attachment")
    FVector2D AttachButtonSize = FVector2D{32.f, 32.f};
 
    UPROPERTY(EditAnywhere, Category = "Thread")
    FText ThreadHeaderText = NSLOCTEXT("StreamChat", "ReplyingInThread", "Replying in thread");
 
    UPROPERTY(EditAnywhere, Category = "Attachment", meta = (ClampMin = "0.1", ClampMax = "1.0"))
    float AttachGlyphScale = 0.5f;
 
    UPROPERTY(EditAnywhere, Category = "Attachment", meta = (ClampMin = "0.01", ClampMax = "0.5"))
    float AttachGlyphThickness = 0.06f;
 
private:
    UFUNCTION()
    void OnInputTextChanged(const FText& Text);
    UFUNCTION()
    void OnInputTextCommit(const FText& Text, ETextCommit::Type CommitMethod);
    UFUNCTION()
    void OnCancelEditingButtonClicked();
    UFUNCTION()
    void OnSendButtonClicked();
    UFUNCTION()
    void OnAttachButtonClicked();
 
    void SendMessage();
    void StopEditMessage();
    void Keystroke();
    void StopTyping();
 
    void CreateAttachmentWidgets();
    UWidget* BuildAttachIcon();
    UWidget* BuildAttachGlyph();
    void Upload(const FPickedAttachment& Picked);
    void SetStatus(const FString& Status);
    void UpdateAttachmentAppearance();
 
    void UpdateSendButtonAppearance(bool bEnabled);
    void RefreshSendButtonEnabled();
 
    enum class ESendButtonIconAppearance
    {
        Send,
        Confirm
    };
    void UpdateEditMessageAppearance(ESendButtonIconAppearance Appearance);
 
    void UpdateHeaderBanner();
 
    TOptional<FMessage> EditedMessage;
 
    TOptional<FMessage> ThreadParentMessage;
 
    FText DefaultHeaderText;
 
    UPROPERTY(Transient)
    TArray<FAttachment> PendingAttachments;
 
    // Spawned in C++: WBP_MessageComposer predates attachments and has no slot to bind them to
    UPROPERTY(Transient)
    UButton* AttachButton;
    UPROPERTY(Transient)
    UWidget* AttachButtonIcon;
    UPROPERTY(Transient)
    TArray<UImage*> AttachGlyphBars;
    UPROPERTY(Transient)
    UTextBlock* AttachStatusTextBlock;
 
    bool bUploading = false;
};