Added SelectionChanged signal to TextBox (#97)

changelog.txt

@@ -1,6 +1,7 @@
 TGUI 0.8.6  (TBD)
 -----------------
 
+- Added SelectionChanged signal to TextBox
 - Added getSelectionStart and getSelectionEnd functions to TextBox
 - Added mousePressed and mouseReleased to respond to different mouse buttons in custom widgets
 

include/TGUI/Widgets/TextBox.hpp

@@ -568,7 +568,8 @@ namespace tgui
         /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
     public:
 
-        SignalString onTextChange = {"TextChanged"};    ///< The text was changed. Optional parameter: new text
+        SignalString onTextChange = {"TextChanged"};     ///< The text was changed. Optional parameter: new text
+        Signal onSelectionChange = {"SelectionChanged"}; ///< Selected text changed
 
 
         /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -593,6 +594,7 @@ namespace tgui
         // Information about the selection
         sf::Vector2<std::size_t> m_selStart;
         sf::Vector2<std::size_t> m_selEnd;
+        std::pair<sf::Vector2<std::size_t>, sf::Vector2<std::size_t>> m_lastSelection;
 
         // Information about the caret
         Vector2f m_caretPosition;

src/TGUI/Widgets/TextBox.cpp

@@ -1546,6 +1546,17 @@ namespace tgui
         }
 
         recalculatePositions();
+
+        // Send an event when the selection changed
+        if ((m_selStart != m_lastSelection.first) || (m_selEnd != m_lastSelection.second))
+        {
+            // Only send the event when there is an actual change, not when the caret position moved
+            if ((m_selStart != m_selEnd) || (m_lastSelection.first != m_lastSelection.second))
+                onSelectionChange.emit(this);
+
+            m_lastSelection.first = m_selStart;
+            m_lastSelection.second = m_selEnd;
+        }
     }
 
     /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -1710,6 +1721,8 @@ namespace tgui
     {
         if (signalName == toLower(onTextChange.getName()))
             return onTextChange;
+        else if (signalName == toLower(onSelectionChange.getName()))
+            return onSelectionChange;
         else
             return Widget::getSignal(std::move(signalName));
     }

tests/Widgets/TextBox.cpp

@@ -441,6 +441,8 @@ TEST_CASE("[TextBox]")
             textBox->textEntered('C');
             REQUIRE(textBox->getText() == "ABCDEFGHIJKLMNOPQRSTUVWXYZABC");
         }
+
+        // TODO: TextChanged and SelectionChanged events
     }
 
     testWidgetRenderer(textBox->getRenderer());