From 80da9007ef1577b8911f44d08706bb9b318e864a Mon Sep 17 00:00:00 2001
From: beru <berupon@gmail.com>
Date: Sun, 17 May 2015 15:02:09 +0900
Subject: [PATCH] add functionality to associate label with other widget as a
 "for" attribute of HTML <label> element

---
 include/nana/gui/widgets/label.hpp |  2 ++
 source/gui/widgets/label.cpp       | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/nana/gui/widgets/label.hpp b/include/nana/gui/widgets/label.hpp
index ba6a5cf0..38f2dbc2 100644
--- a/include/nana/gui/widgets/label.hpp
+++ b/include/nana/gui/widgets/label.hpp
@@ -65,6 +65,8 @@ namespace nana
 		label& format(bool);		///< Switches the format mode of the widget.
 		label& add_format_listener(std::function<void(command, const nana::string&)>);
 
+		void relate(widget& w);	// as same as the "for" attribute of a label
+
 		/// \briefReturn the size of the text. If *allowed_width_in_pixel* is not zero, returns a 
 		/// "corrected" size that changes lines to fit the text into the specified width
 		nana::size measure(unsigned allowed_width_in_pixel) const;
diff --git a/source/gui/widgets/label.cpp b/source/gui/widgets/label.cpp
index 66e76027..0784a36a 100644
--- a/source/gui/widgets/label.cpp
+++ b/source/gui/widgets/label.cpp
@@ -628,6 +628,8 @@ namespace nana
 					nana::string target;	//It indicates which target is tracing.
 					nana::string url;
 
+					widget * buddy {nullptr};
+
 					void add_listener(std::function<void(command, const nana::string&)>&& fn)
 					{
 						listener_.emplace_back(std::move(fn));
@@ -740,6 +742,10 @@ namespace nana
 						impl_->call_listener(command::click, impl_->target);
 
 					system::open_url(url);
+
+					if (impl_->buddy) {
+						impl_->buddy->focus();
+					}
 				}
 
 				void trigger::refresh(graph_reference graph)
@@ -821,6 +827,11 @@ namespace nana
 			return *this;
 		}
 
+		void label::relate(widget& w)
+		{
+			get_drawer_trigger().impl()->buddy = &w;
+		}
+
 		nana::size label::measure(unsigned limited) const
 		{
 			if(empty())