UnrealEngineUWP/Engine/Source/Editor/UnrealEd/Public/SEditorViewportToolBarButton.h

// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.


#pragma once


/**
 * A simple class that represents a toolbar button in an editor viewport toolbar
 */
class UNREALED_API SEditorViewportToolBarButton : public SCompoundWidget
{
public:
	SLATE_BEGIN_ARGS( SEditorViewportToolBarButton )
		: _ButtonType( EUserInterfaceActionType::Button )
		, _IsChecked(false)
		{}

		/** Called when the button is clicked */
		SLATE_EVENT( FOnClicked, OnClicked )
		/** The button type to use */
		SLATE_ARGUMENT( EUserInterfaceActionType::Type, ButtonType )
		/** Checked state of the button */
		SLATE_ATTRIBUTE( bool, IsChecked )
		/** Style name of an image to use. Simple two state images are supported.  An image can be different depending on checked/unchecked state */
		SLATE_ATTRIBUTE( FName, Image )
		/** Any custom content to show in the button in place of other content */
		SLATE_DEFAULT_SLOT( FArguments, Content )
	SLATE_END_ARGS()

	void Construct( const FArguments& Declaration );
private:
	/** 
	 * Called when the button check state changes
	 * 
	 * @param NewCheckedState	The new state of the check box
	 */
	void OnCheckStateChanged( ECheckBoxState NewCheckedState );

	/**
	 * Called when we need to get the image to show in the button
	 *
	 * @return The brush defining the image to use
	 */
	const FSlateBrush* OnGetButtonImage() const;

	/**
	 * Called when we need to get the state of the check box button
	 *
	 * @return The state of the check box button
	 */
	ECheckBoxState OnIsChecked() const;

private:
	/** Attribute used to get the state of a checkbox */
	TAttribute<bool> IsChecked;
	/** Delegate to call when the button is clicked */
	FOnClicked OnClickedDelegate;
	/** Cached brush to use when the button is checked */
	const FSlateBrush* CheckedBrush;
	/** Cached brush to use when the button is unchecked */
	const FSlateBrush* NormalBrush;
};