Added a minimum alpha opacity value handle in SkinLoader and made use of it.

Part 1 of 3 for Mantis #847
Only a few controls follow minimum opacity value at login stage.
Part 2 will make all other controls do the same.
Part 3 will try to set default gui opacity value as a constant.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gui/widgets/button.h b/src/gui/widgets/button.h
index eebf7931..7eb7e2ef 100644
--- a/src/gui/widgets/button.h
+++ b/src/gui/widgets/button.h
@@ -56,6 +56,11 @@ class Button : public gcn::Button
          */
         void draw(gcn::Graphics *graphics);
 
+        /**
+         * Update the alpha value to the button components.
+         */
+        void updateAlpha();
+
     private:
         void init();