[UE5.1][C++] How can I pass a widget to my player character ?

Development Programming & Scripting C++
,
1

I have a character in C++ and I want to have the C++ code set the health status on the widget without using a blueprint. At the same time I would like to keep the design for my UI, which has Dynamic materials in it and so on, in the editor. Thanks in advance.

2

Hello, you can simply create a class derived from UUserWidget in c++ and implement your functions in c++ or even in Blueprint/c++ with “maccro UFUNCTION”

then create a blueprint Widget derived from this class
here is an example code:

#pragma once

#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "MyWidget.generated.h"

/**
 * 
 */

UCLASS()
class PLUGIN_API UMyWidget : public UUserWidget
{
	GENERATED_BODY()
public:
	UFUNCTION(BlueprintNativeEvent,BlueprintCallable)
	void UpdateHealth();
	UFUNCTION(BlueprintCallable)
	void UpdateItem();
};
3

Thanks. That is straightforward for implemeting the widget in C++ but how do i give it to my player character to push ipdates to the widget rather than poll per tick?

4

In your class character you can create a reference of your widget and the class it uses which you expose in Blueprint

here in your Character.h:

    UPROPERTY()
	UMyWidget* MyWidget;
	UPROPERTY(BlueprintReadOnly,EditAnywhere)
	TSubclassOf<UMyWidget> MyWidgetClass;

then in your cpp you can create it and do whatever you want

if(!IsValid(MyWidget))
	MyWidget= CreateWidget<UMyWidget>(GetWorld()->GetFirstPlayerController(),MyWidgetClass);
if(IsValid(MyWidget))
{
    MyWidget->AddToViewport();
		
    //Do your update in your cpp 
    MyWidget->UpdateHealth();
    MyWidget->UpdateItem();
}

in your Blueprint, just set MyWidgetClass to the widget you created in the editor.

5

This actually has become problematic because I cant seem to set the variables in the C++ with the blueprint.

#pragma once

#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "QCMissionHUD.generated.h"

UCLASS(Abstract)
class UQCMissionHUD : public UUserWidget {
	GENERATED_BODY()

public: 

	/** Update the HUD with the current the shield percent. */
	void SetShield(float Percent);

	/** The dynamic material used to represent the shield. */
	UPROPERTY(BlueprintReadWrite, meta=(BindWidget))
	class UMaterialInstanceDynamic* ShieldMaterial;
};

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This doesnt work. I have tried a number of things to set the dynamic material instance, using a number of events and the blueprint compiler still reports:

A required widget binding "ShieldMaterial" of type  Material Instance Dynamic  was not found.

Clearly I am missing somethng but deep search of the internet has not revealed what that might be.

6

Unfortunately I cant get this working so I will try slate.

7

You don’t need a “deep search” of the internet, you need to read the error message.
And, potentially, doing a shallow search of the source code.