From 59704b49c212e24f0292b6d1470fc1cd9d4afd3e Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 14 Dec 2008 23:12:30 +0000
Subject: [PATCH] don't mistake a simple click on a column for a reordering
 drag

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57344 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 include/wx/generic/headerctrlg.h |  6 +++-
 src/generic/headerctrlg.cpp      | 51 ++++++++++++++++++++++----------
 2 files changed, 41 insertions(+), 16 deletions(-)

diff --git a/include/wx/generic/headerctrlg.h b/include/wx/generic/headerctrlg.h
index 3550f179ca..28a73c24b0 100644
--- a/include/wx/generic/headerctrlg.h
+++ b/include/wx/generic/headerctrlg.h
@@ -127,7 +127,11 @@ private:
     // same functions as above but for column moving/reordering instead of
     // resizing
     void StartReordering(unsigned int col, int xPhysical);
-    void EndReordering(int xPhysical);
+
+    // returns true if we did drag the column somewhere else or false if we
+    // didn't really move it -- in this case we consider that no reordering
+    // took place and that a normal column click event should be generated
+    bool EndReordering(int xPhysical);
 
     // constrain the given position to be larger than the start position of the
     // given column plus its minimal width and return the effective width
diff --git a/src/generic/headerctrlg.cpp b/src/generic/headerctrlg.cpp
index 5d040b69d9..4bac640faa 100644
--- a/src/generic/headerctrlg.cpp
+++ b/src/generic/headerctrlg.cpp
@@ -413,10 +413,12 @@ void wxHeaderCtrl::StartReordering(unsigned int col, int xPhysical)
     SetCursor(wxCursor(wxCURSOR_HAND));
     CaptureMouse();
 
-    UpdateReorderingMarker(xPhysical);
+    // do not call UpdateReorderingMarker() here: we don't want to give
+    // feedback for reordering until the user starts to really move the mouse
+    // as he might want to just click on the column and not move it at all
 }
 
-void wxHeaderCtrl::EndReordering(int xPhysical)
+bool wxHeaderCtrl::EndReordering(int xPhysical)
 {
     wxASSERT_MSG( IsReordering(), "shouldn't be called if we're not reordering" );
 
@@ -424,20 +426,33 @@ void wxHeaderCtrl::EndReordering(int xPhysical)
 
     ReleaseMouse();
 
-    wxHeaderCtrlEvent event(wxEVT_COMMAND_HEADER_END_REORDER, GetId());
-    event.SetEventObject(this);
-    event.SetColumn(m_colBeingReordered);
+    const int colOld = m_colBeingReordered,
+              colNew = FindColumnAtPoint(xPhysical);
 
-    const unsigned pos = GetColumnPos(FindColumnAtPoint(xPhysical));
-    event.SetNewOrder(pos);
+    m_colBeingReordered = COL_NONE;
 
-    if ( !GetEventHandler()->ProcessEvent(event) || event.IsAllowed() )
+    if ( xPhysical - GetColStart(colOld) == m_dragOffset )
+        return false;
+
+    if ( colNew != colOld )
     {
-        // do reorder the columns
-        DoMoveCol(m_colBeingReordered, pos);
+        wxHeaderCtrlEvent event(wxEVT_COMMAND_HEADER_END_REORDER, GetId());
+        event.SetEventObject(this);
+        event.SetColumn(colOld);
+
+        const unsigned pos = GetColumnPos(FindColumnAtPoint(xPhysical));
+        event.SetNewOrder(pos);
+
+        if ( !GetEventHandler()->ProcessEvent(event) || event.IsAllowed() )
+        {
+            // do reorder the columns
+            DoMoveCol(colOld, pos);
+        }
     }
 
-    m_colBeingReordered = COL_NONE;
+    // whether we moved the column or not, the user did move the mouse and so
+    // did try to do it so return true
+    return true;
 }
 
 // ----------------------------------------------------------------------------
@@ -588,12 +603,18 @@ void wxHeaderCtrl::OnMouse(wxMouseEvent& mevent)
 
     if ( IsReordering() )
     {
-        if ( mevent.LeftUp() )
-            EndReordering(xPhysical);
-        else // update the column position
+        if ( !mevent.LeftUp() )
+        {
+            // update the column position
             UpdateReorderingMarker(xPhysical);
 
-        return;
+            return;
+        }
+
+        // finish reordering and continue to generate a click event below if we
+        // didn't really reorder anything
+        if ( EndReordering(xPhysical) )
+            return;
     }
 
 
-- 
2.45.2