Add methods to change the selected items of a ListBox

Author: victorlevasseur

examples/ListBox.cpp

@@ -71,6 +71,7 @@ int main() {
 	listbox3->AppendItem( "Sixth item" );
 	listbox3->AppendItem( "Last one !" );
 	listbox3->SetSelectionMode( sfg::ListBox::SelectionMode::MULTI_SELECTION );
+	listbox3->SetSelection( {1, 3, 4, 5} );
 	box3->PackEnd( listbox3 );
 
 	window3->Add( box3 );

include/SFGUI/ListBox.hpp

@@ -4,6 +4,8 @@
 #include <SFGUI/Scrollbar.hpp>
 
 #include <SFML/System/String.hpp>
+
+#include <initializer_list>
 #include <memory>
 #include <set>
 #include <vector>
@@ -58,6 +60,11 @@ class SFGUI_API ListBox : public Container {
 
 		IndexType GetHighlightedItem() const;
 
+		void SetSelection( IndexType index );
+		void SetSelection( std::initializer_list<IndexType> indices );
+		void AppendToSelection( IndexType index );
+		void RemoveFromSelection( IndexType index );
+
 		bool IsItemSelected( IndexType index ) const;
         IndexType GetSelectedItemsCount() const;
 		IndexType GetSelectedItemIndex( IndexType index = 0 ) const;

src/SFGUI/ListBox.cpp

@@ -195,6 +195,53 @@ ListBox::IndexType ListBox::GetHighlightedItem() const {
 	return m_highlighted_item;
 }
 
+void ListBox::SetSelection( IndexType index ) {
+	if( m_selection_mode == SelectionMode::NO_SELECTION ) {
+		return;
+	}
+
+	m_selected_items.clear();
+	if( index != NONE ) {
+		m_selected_items.insert( index );
+	}
+
+	Invalidate();
+}
+
+void ListBox::SetSelection( std::initializer_list<IndexType> indices ) {
+	if( m_selection_mode == SelectionMode::MULTI_SELECTION ) {
+		m_selected_items = std::set<IndexType>( indices.begin(), indices.end() );
+
+		Invalidate();
+	} else if( m_selection_mode == SelectionMode::SINGLE_SELECTION ) {
+		if( indices.size() > 0) {
+			SetSelection( *( indices.begin() ) );
+		} else {
+			SetSelection( NONE );
+		}
+
+		Invalidate();
+	}
+}
+
+void ListBox::AppendToSelection( IndexType index ) {
+	if( m_selection_mode == SelectionMode::NO_SELECTION ) {
+		return;
+	}
+
+	if( m_selected_items.size() == 0 || m_selection_mode == SelectionMode::MULTI_SELECTION ) {
+		m_selected_items.insert( index );
+	}
+
+	Invalidate();
+}
+
+void ListBox::RemoveFromSelection( IndexType index ) {
+	m_selected_items.erase( index );
+
+	Invalidate();
+}
+
 bool ListBox::IsItemSelected(IndexType index) const {
 	return m_selected_items.find( index ) != m_selected_items.end();
 }