From 9314a07dfcc0a5123beb50ddb198cbcc5805d7db Mon Sep 17 00:00:00 2001
From: Andreas Monzner <andreas.monzner@multimedia-labs.de>
Date: Fri, 3 Feb 2006 15:37:38 +0000
Subject: [PATCH] add ability to enable wrap around in listbox

---
 lib/gui/elistbox.cpp | 69 +++++++++++++++++++++++++++++++++-----------
 lib/gui/elistbox.h   |  5 ++++
 2 files changed, 57 insertions(+), 17 deletions(-)

diff --git a/lib/gui/elistbox.cpp b/lib/gui/elistbox.cpp
index f1efadfd..8520a02a 100644
--- a/lib/gui/elistbox.cpp
+++ b/lib/gui/elistbox.cpp
@@ -5,7 +5,7 @@
 
 eListbox::eListbox(eWidget *parent)
 	:eWidget(parent), m_scrollbar_mode(showNever), m_prev_scrollbar_page(-1)
-	,m_content_changed(false), m_top(0), m_selected(0), m_itemheight(25)
+	,m_content_changed(false), m_enabled_wrap_around(false), m_top(0), m_selected(0), m_itemheight(25)
 	,m_items_per_page(0), m_selection_enabled(1), m_scrollbar(NULL)
 {
 //	setContent(new eListboxStringContent());
@@ -46,6 +46,11 @@ void eListbox::setScrollbarMode(int mode)
 	}
 }
 
+void eListbox::setWrapAround(bool state)
+{
+	m_enabled_wrap_around = state;
+}
+
 void eListbox::setContent(iListboxContent *content)
 {
 	int oldsel = m_selected;
@@ -57,6 +62,37 @@ void eListbox::setContent(iListboxContent *content)
 		/* emit */ selectionChanged();
 }
 
+bool eListbox::atBegin()
+{
+	if (m_content && !m_selected)
+		return true;
+	return false;
+}
+
+bool eListbox::atEnd()
+{
+	if (m_content && m_content->size() == m_selected+1)
+		return true;
+	return false;
+}
+
+void eListbox::moveToEnd()
+{
+	/* move to last existing one ("end" is already invalid) */
+	m_content->cursorEnd(); m_content->cursorMove(-1);
+	/* current selection invisible? */
+	if (m_top + m_items_per_page <= m_content->cursorGet())
+	{
+		int rest = m_content->size() % m_items_per_page;
+		if ( rest )
+			m_top = m_content->cursorGet() - rest + 1;
+		else
+			m_top = m_content->cursorGet() - m_items_per_page + 1;
+		if (m_top < 0)
+			m_top = 0;
+	}
+}
+
 void eListbox::moveSelection(int dir)
 {
 		/* refuse to do anything without a valid list. */
@@ -72,13 +108,25 @@ void eListbox::moveSelection(int dir)
 	switch (dir)
 	{
 	case moveUp:
+	{
 		m_content->cursorMove(-1);
+		if ( m_enabled_wrap_around && oldsel == m_content->cursorGet() )  // must wrap around ?
+			moveToEnd();
 		break;
+	}
 	case moveDown:
 		m_content->cursorMove(1);
-			/* ok - we could have reached the end. we just go one back then. */
+			/* ok - we could have reached the end. So we do wrap around. */
 		if (!m_content->cursorValid())
-			m_content->cursorMove(-1);
+		{
+			if ( m_enabled_wrap_around )
+			{
+				m_top = 0;
+				m_content->cursorHome();
+			}
+			else
+				m_content->cursorMove(-1);
+		}
 		break;
 	case pageUp:
 		if (m_content->cursorGet() >= m_items_per_page)
@@ -97,26 +145,13 @@ void eListbox::moveSelection(int dir)
 		m_content->cursorHome();
 		m_top = 0; /* align with top, speeds up process */
 		break;
-
 	case pageDown:
 		m_content->cursorMove(m_items_per_page);
 		if (m_content->cursorValid())
 			break;
 				/* fall through */
 	case moveEnd:
-			/* move to last existing one ("end" is already invalid) */
-		m_content->cursorEnd(); m_content->cursorMove(-1); 
-			/* current selection invisible? */
-		if (m_top + m_items_per_page <= m_content->cursorGet())
-		{
-			int rest = m_content->size() % m_items_per_page;
-			if ( rest )
-				m_top = m_content->cursorGet() - rest + 1;
-			else
-				m_top = m_content->cursorGet() - m_items_per_page + 1;
-			if (m_top < 0)
-				m_top = 0;
-		}
+		moveToEnd();
 		break;
 	case justCheck:
 		break;
diff --git a/lib/gui/elistbox.h b/lib/gui/elistbox.h
index 87013bc1..76ad8208 100644
--- a/lib/gui/elistbox.h
+++ b/lib/gui/elistbox.h
@@ -65,6 +65,7 @@ public:
 		showNever
 	};
 	void setScrollbarMode(int mode);
+	void setWrapAround(bool);
 
 	void setContent(iListboxContent *content);
 	
@@ -79,6 +80,9 @@ public:
 	int getCurrentIndex();
 	void moveSelection(int how);
 	void moveSelectionTo(int index);
+	void moveToEnd();
+	bool atBegin();
+	bool atEnd();
 
 	enum ListboxActions {
 		moveUp,
@@ -109,6 +113,7 @@ protected:
 private:
 	int m_scrollbar_mode, m_prev_scrollbar_page;
 	bool m_content_changed;
+	bool m_enabled_wrap_around;
 
 	int m_top, m_selected;
 	int m_itemheight;
-- 
2.30.2