add measure_mode enum

Author: igagis

src/ruis/widget/widget.hpp

@@ -63,6 +63,23 @@ enum class event_status {
 	propagate
 };
 
+/**
+ * @brief Widget measurement modes.
+ */
+enum class measure_mode {
+	/**
+	 * @brief The widget will be resized to the given exact size.
+	 * The widget is expected to return the same size value as is.
+	 */
+	exactly,
+
+	/**
+	 * @brief The widget can be at most the given size.
+	 * The widget is expected to return a size less than the given size limit.
+	 */
+	at_most
+};
+
 /**
  * @brief Base widget class.
  */