From 66a9201df8b0179ed8031412778e636f97b44e50 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 22 Dec 2007 15:58:38 +0000
Subject: [PATCH] implement wxListCtrl::ScrollList() (in report view and
 vertical direction only) (slightly modified patch 1843647)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50902 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt         |  1 +
 src/generic/listctrl.cpp | 34 ++++++++++++++++++++++++++++++++--
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index 9ed01b58af..8a29459d4f 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -299,6 +299,7 @@ All (GUI):
 
 - Added wxWindow::GetNextSibling() and GetPrevSibling()
 - Improve wximage::ResampleBox() (Mihai Ciocarlie)
+- Implemented ScrollList() in generic wxListCtrl (Tim Kosse)
 
 wxMSW:
 
diff --git a/src/generic/listctrl.cpp b/src/generic/listctrl.cpp
index a5b504235f..7a63129ecd 100644
--- a/src/generic/listctrl.cpp
+++ b/src/generic/listctrl.cpp
@@ -580,6 +580,8 @@ public:
     // bring the selected item into view, scrolling to it if necessary
     void MoveToItem(size_t item);
 
+    bool ScrollList( int WXUNUSED(dx), int dy );
+
     // bring the current item into view
     void MoveToFocus() { MoveToItem(m_current); }
 
@@ -3314,6 +3316,34 @@ void wxListMainWindow::MoveToItem(size_t item)
     }
 }
 
+bool wxListMainWindow::ScrollList(int WXUNUSED(dx), int dy)
+{
+    if ( !InReportView() )
+    {
+        // TODO: this should work in all views but is not implemented now
+        return false;
+    }
+
+    size_t top, bottom;
+    GetVisibleLinesRange(&top, &bottom);
+
+    if ( bottom == (size_t)-1 )
+        return 0;
+
+    ResetVisibleLinesRange();
+
+    int hLine = GetLineHeight();
+
+    Scroll(-1, top + dy / hLine);
+
+#ifdef __WXMAC__
+    // see comment in MoveToItem() for why we do this
+    ResetVisibleLinesRange();
+#endif
+
+    return true;
+}
+
 // ----------------------------------------------------------------------------
 // keyboard handling
 // ----------------------------------------------------------------------------
@@ -5570,9 +5600,9 @@ long wxGenericListCtrl::InsertColumn( long col, const wxString &heading,
     return InsertColumn( col, item );
 }
 
-bool wxGenericListCtrl::ScrollList( int WXUNUSED(dx), int WXUNUSED(dy) )
+bool wxGenericListCtrl::ScrollList( int dx, int dy )
 {
-    return 0;
+    return m_mainWin->ScrollList(dx, dy);
 }
 
 // Sort items.
-- 
2.45.2