allows sliders to be adjusted with keyboard left and right

changelog

@@ -10,6 +10,7 @@ Version 1.3-svn:
      * decreased cost of the Mudcrawler from 9 to 5
  * user interface
    * disable inactive sliders instead of hiding them
+   * sliders can be adjusted with keyboard left and right
 
 Version 1.1.7:
  * campaigns

src/multiplayer_lobby.cpp

@@ -258,7 +258,6 @@ void gamebrowser::handle_event(const SDL_Event& event)
 
 				if(point_in_rect(x, y, item_rect)) {
 					set_focus(true);
-					set_dirty();
 					selected_ = i;
 					break;
 				}

src/widgets/menu.cpp

@@ -524,6 +524,9 @@ void menu::key_press(SDLKey key)
 void menu::handle_event(const SDL_Event& event)
 {
 	scrollarea::handle_event(event);
+	if (hidden())
+		return;
+
 	if(event.type == SDL_KEYDOWN) {
 		// Only pass key events if we have the focus
 		if (focus())

src/widgets/slider.cpp

@@ -20,6 +20,7 @@
 
 #include <algorithm>
 #include <iostream>
+#include <sstream>
 
 namespace {
 	const std::string slider_image = "buttons/slider.png";
@@ -173,6 +174,7 @@ void slider::mouse_down(const SDL_MouseButtonEvent& event)
 		return;
 
 	state_ = CLICKED;
+	set_focus(true);
 	set_slider_position(event.x);
 }
 
@@ -180,9 +182,9 @@ void slider::handle_event(const SDL_Event& event)
 {
 	if (hidden() || !enabled())
 		return;
-
+	
 	STATE start_state = state_;
-
+	
 	switch(event.type) {
 	case SDL_MOUSEBUTTONUP:
 		state_ = NORMAL;
@@ -193,12 +195,21 @@ void slider::handle_event(const SDL_Event& event)
 	case SDL_MOUSEMOTION:
 		mouse_motion(event.motion);
 		break;
+	case SDL_KEYDOWN:
+		if(focus()) {
+			const SDL_keysym& key = reinterpret_cast<const SDL_KeyboardEvent&>(event).keysym;
+			const int c = key.sym;
+			if(c == SDLK_LEFT) {
+				set_value(value_ - increment_);
+			} else if(c == SDLK_RIGHT) {
+				set_value(value_ + increment_);
+			}
+		}
+		break;
 	default:
 		return;
 	}
-
 	if (start_state != state_)
 		set_dirty(true);
 }
-
-}
+} //end namespace gui

src/widgets/slider.hpp

@@ -45,6 +45,7 @@ public:
 	virtual void set_location(SDL_Rect const &rect);
 
 protected:
+	bool requires_event_focus() const { return enabled(); }
 	virtual void handle_event(const SDL_Event& event);
 	virtual void draw_contents();