146 lines
4.3 KiB
C++
146 lines
4.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "Misc/Attribute.h"
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#include "Layout/Margin.h"
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#include "Styling/SlateColor.h"
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#include "Fonts/SlateFontInfo.h"
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#include "Widgets/DeclarativeSyntaxSupport.h"
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#include "Widgets/SWidget.h"
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#include "Widgets/SCompoundWidget.h"
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#include "Styling/SlateTypes.h"
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#include "Styling/CoreStyle.h"
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#include "Framework/SlateDelegates.h"
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#include "Widgets/Input/SComboBox.h"
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/**
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* A combo box that shows text content.
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*/
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class STextComboBox : public SCompoundWidget
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{
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public:
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DECLARE_DELEGATE_RetVal_OneParam( FString, FGetTextComboLabel, TSharedPtr<FString> );
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typedef TSlateDelegates< TSharedPtr<FString> >::FOnSelectionChanged FOnTextSelectionChanged;
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SLATE_BEGIN_ARGS( STextComboBox )
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: _ComboBoxStyle(&FCoreStyle::Get().GetWidgetStyle< FComboBoxStyle >("ComboBox"))
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, _ButtonStyle(nullptr)
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, _ColorAndOpacity( FSlateColor::UseForeground() )
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, _ContentPadding(_ComboBoxStyle->ContentPadding)
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, _OnGetTextLabelForItem()
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{}
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SLATE_STYLE_ARGUMENT(FComboBoxStyle, ComboBoxStyle)
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/** The visual style of the button part of the combo box (overrides ComboBoxStyle) */
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SLATE_STYLE_ARGUMENT(FButtonStyle, ButtonStyle)
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/** Selection of strings to pick from */
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SLATE_ITEMS_SOURCE_ARGUMENT(TSharedPtr<FString>, OptionsSource)
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/** Text color and opacity */
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SLATE_ATTRIBUTE( FSlateColor, ColorAndOpacity )
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/** Sets the font used to draw the text */
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SLATE_ATTRIBUTE(FSlateFontInfo, Font)
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/** Visual padding of the button content for the combobox */
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SLATE_ATTRIBUTE( FMargin, ContentPadding )
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/** Called when the text is chosen. */
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SLATE_EVENT( FOnTextSelectionChanged, OnSelectionChanged)
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/** Called when the combo box is opened */
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SLATE_EVENT( FOnComboBoxOpening, OnComboBoxOpening )
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/** Called when combo box needs to establish selected item */
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SLATE_ARGUMENT( TSharedPtr<FString>, InitiallySelectedItem )
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/** [Optional] Called to get the label for the currently selected item */
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SLATE_EVENT( FGetTextComboLabel, OnGetTextLabelForItem )
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SLATE_END_ARGS()
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SLATE_API void Construct( const FArguments& InArgs );
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/** Called to create a widget for each string */
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SLATE_API TSharedRef<SWidget> MakeItemWidget( TSharedPtr<FString> StringItem );
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SLATE_API void SetSelectedItem (TSharedPtr<FString> NewSelection);
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/** Returns the currently selected text string */
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TSharedPtr<FString> GetSelectedItem()
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{
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return SelectedItem;
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}
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/** Sets new item source */
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void SetItemsSource(const TArray<TSharedPtr<FString>>* InListItemsSource)
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{
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StringCombo->SetItemsSource(InListItemsSource);
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}
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/** Sets new item source */
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void SetItemsSource(TSharedRef<::UE::Slate::Containers::TObservableArray<TSharedPtr<FString>>> InListItemsSource)
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{
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StringCombo->SetItemsSource(InListItemsSource);
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}
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/** Clears current item source */
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void ClearItemsSource()
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{
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StringCombo->ClearItemsSource();
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}
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/** Update the style of the internal ComboBox */
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void SetStyle(const FComboBoxStyle* InComboStyle)
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{
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StringCombo->SetStyle(InComboStyle);
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}
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/** @return true if the popup is open; false otherwise. */
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bool IsOpen() const
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{
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return StringCombo->IsOpen();
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}
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/** Request to reload the text options in the combobox from the OptionsSource attribute */
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SLATE_API void RefreshOptions();
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/** Clears the selected item in the text combo */
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SLATE_API void ClearSelection();
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private:
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TSharedPtr<FString> OnGetSelection() const {return SelectedItem;}
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/** Called when selection changes in the combo pop-up */
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SLATE_API void OnSelectionChanged (TSharedPtr<FString> Selection, ESelectInfo::Type SelectInfo);
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/** Helper method to get the text for a given item in the combo box */
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SLATE_API FText GetSelectedTextLabel() const;
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SLATE_API FText GetItemTextLabel(TSharedPtr<FString> StringItem) const;
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private:
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/** Called to get the text label for an item */
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FGetTextComboLabel GetTextLabelForItem;
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/** The text item selected */
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TSharedPtr<FString> SelectedItem;
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/** Array of shared pointers to strings so combo widget can work on them */
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TArray< TSharedPtr<FString> > Strings;
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/** The combo box */
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TSharedPtr< SComboBox< TSharedPtr<FString> > > StringCombo;
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/** Forwarding Delegate */
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FOnTextSelectionChanged SelectionChanged;
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/** Sets the font used to draw the text */
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TAttribute< FSlateFontInfo > Font;
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};
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