Specify underlying type of some enum classes to make them smaller

A number of enum classes can be a lot smaller by specifying a smaller
underlying type (and they don't need the big range of the large
default type).

Author: jjuhl

include/TGUI/Components.hpp

@@ -64,7 +64,7 @@ namespace dev
     /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
     /// Layout alignment for automatically setting the position and (part of) the size of a component
-    enum class AlignLayout
+    enum class AlignLayout : std::uint8_t
     {
         None,       //!< Position and size need to be manually set. This is the default.
         Top,        //!< Places the component on on the top and sets its width to the area between Leftmost and Rightmost aligned components. Height needs to be manually set.
@@ -79,7 +79,7 @@ namespace dev
     /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
     /// Position alignment of a component within its parent
-    enum class PositionAlignment
+    enum class PositionAlignment : std::uint8_t
     {
         None,        //!< Place the component at the manually set position. This is the default.
         TopLeft,     //!< Place the component in the upper left corner of its parent

include/TGUI/Widgets/ComboBox.hpp

@@ -40,7 +40,7 @@ namespace tgui
     public:
 
         /// @brief The side where the list will be displayed
-        enum class ExpandDirection
+        enum class ExpandDirection : std::uint8_t
         {
             Down, //!< Display the list below the combo box
             Up,   //!< Display the list above the combo box

include/TGUI/Widgets/Grid.hpp

@@ -50,7 +50,7 @@ namespace tgui
         /// Where in the cell is the widget located?
         /// The widget is centered by default.
         /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-        enum class Alignment
+        enum class Alignment : std::uint8_t
         {
             Center,      //!< Center the widget in the cell
             UpperLeft,   //!< Draw the widget in the upper left corner of the cell

include/TGUI/Widgets/ProgressBar.hpp

@@ -50,7 +50,7 @@ namespace tgui
         ///
         /// Determines in which direction the progress bar is filled when value goes from minimum to maximum.
         /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-        enum class FillDirection
+        enum class FillDirection : std::uint8_t
         {
             LeftToRight,  //!< Start filling at the left side and go to the right
             RightToLeft,  //!< Start filling at the right side and go to the left

include/TGUI/Widgets/Scrollbar.hpp

@@ -48,7 +48,7 @@ namespace tgui
         static constexpr const char StaticWidgetType[] = "Scrollbar"; //!< Type name of the widget
 
         /// @brief Defines when the scrollbar shows up
-        enum class Policy
+        enum class Policy : std::uint8_t
         {
             Automatic,  //!< Show the scrollbar only when needed (default)
             Always,     //!< Always show the scrollbar, even when the contents fits
@@ -383,7 +383,7 @@ namespace tgui
         /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
     protected:
 
-        enum class Part
+        enum class Part : std::uint8_t
         {
             None,
             Track,

include/TGUI/Widgets/TabContainer.hpp

@@ -53,7 +53,7 @@ namespace tgui
         /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
         /// @brief Enumeration of the tab alignments for tabs
         /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-        enum class TabAlign
+        enum class TabAlign : std::uint8_t
         {
             Top    = 0,      //!< Tabs are above panels
             Bottom = 1 << 0  //!< Tabs are below panels