make trackswitch window semitransparent

widgets/map.cpp

@@ -524,6 +524,14 @@ void ui::launcher_window::render_content()
 
 ui::track_switch_window::track_switch_window(ui_panel &panel, std::shared_ptr<map::track_switch> &&sw) : popup(panel), m_switch(sw) {}
 
+bool ui::track_switch_window::render()
+{
+    ImGui::PushStyleVar(ImGuiStyleVar_Alpha, 0.5f);
+    bool ret = popup::render();
+    ImGui::PopStyleVar();
+    return ret;
+}
+
 void ui::track_switch_window::render_content()
 {
     auto &highlight = dynamic_cast<map_panel&>(m_parent).highlighted_switches;

widgets/map.h

@@ -54,6 +54,7 @@ class track_switch_window : public popup
   public:
     track_switch_window(ui_panel &panel, std::shared_ptr<map::track_switch> &&sw);
 
+	virtual bool render() override;
     virtual void render_content() override;
 };
 

widgets/popup.h

@@ -14,7 +14,7 @@ class popup
 	popup(ui_panel &panel);
 	virtual ~popup();
 
-	bool render();
+    virtual bool render();
 
   protected:
 	ui_panel &m_parent;