Slate UI Widget implementation

SGreetings.cpp

#include "SGreetings.h"
#include "SlateOptMacros.h"
#include "Widgets/Input/SEditableTextBox.h"

#define LOCTEXT_NAMESPACE "SGreetings"

const TArray<FText> SGreetings::Titles =
	{
		LOCTEXT("Mr", "Mr."),
		LOCTEXT("Mrs", "Mrs."),
		LOCTEXT("Ms", "Ms."),
	};

BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION
void SGreetings::Construct(const FArguments& InArgs)
{
	SelectedTitle = MakeShareable(new FText(Titles[0]));
	for (const auto& Title : Titles)
	{
		TitleOptions.Add(MakeShareable(new FText(Title)));
	}
	
	TSharedPtr<SComboBox<TSharedPtr<FText>>> TitleComboBox;
	ChildSlot
	[
		SNew(SBorder)
		.BorderImage(InArgs._Background)
		.Padding(FMargin(20))
		[
			SNew(SVerticalBox)
			+SVerticalBox::Slot()
			.AutoHeight()
			[
				SNew(SHorizontalBox)
				+SHorizontalBox::Slot()
				[
					SAssignNew(TitleComboBox, SComboBox<TSharedPtr<FText>>)
					.InitiallySelectedItem(SelectedTitle)
					.OptionsSource(&TitleOptions)
					.OnSelectionChanged_Lambda([this](TSharedPtr<FText> NewSelection, ESelectInfo::Type SelectInfo)
					{
						SelectedTitle = NewSelection;
					})
					.OnGenerateWidget_Lambda([](TSharedPtr<FText> Option)
					{
						return SNew(STextBlock)
						.Font(FCoreStyle::GetDefaultFontStyle("Regular", 18))
						.Text(*Option);
					})
					[
						SNew(STextBlock)
						.Font(FCoreStyle::GetDefaultFontStyle("Regular", 18))
						.Text_Lambda([this]()
						{
							return SelectedTitle.IsValid() ? *SelectedTitle: FText::GetEmpty();
						})
					]
				]
				+SHorizontalBox::Slot()
				.Padding(5, 0)
				[
					SAssignNew(NameBox, SEditableTextBox)
					.Font(FCoreStyle::GetDefaultFontStyle("Regular", 18))
					.HintText(LOCTEXT("YourName", "Fill your name"))
				]
				+SHorizontalBox::Slot()
				.Padding(5, 0)
				[
					SNew(SButton)
					.OnClicked(this, &SGreetings::Greet)
					[
						SNew(STextBlock)
						.Font(FCoreStyle::GetDefaultFontStyle("Regular", 18))
						.Text(LOCTEXT("Hello", "Hello!"))
					]
				]
			]
			+SVerticalBox::Slot()
			.Padding(0, 10)
			[
				SAssignNew(GreetBox, STextBlock)
				.Font(FCoreStyle::GetDefaultFontStyle("Regular", 18))
			]
		]
	];
}

FReply SGreetings::Greet()
{
	GreetBox->SetText(FText::Format(LOCTEXT("GreetingsText", "Hello, {0} {1}!"), *SelectedTitle, NameBox->GetText()));
	return FReply::Handled();
}

END_SLATE_FUNCTION_BUILD_OPTIMIZATION

#undef LOCTEXT_NAMESPACE

Good job! But if i have a layout config of buttons in json file, how to call SNew at runtime by C++ , because SCompoundWidget::Construct function can not run at after read json file.
Thanks a lot!

That's a good one example. Thanks a lot!