implementing pure carbon event behaviour, getting rid of doubly executed events

[wxWidgets.git] / src / generic / vscroll.cpp

diff --git a/src/generic/vscroll.cpp b/src/generic/vscroll.cpp
index e592f8054169030b2e9e3e99e83a40a03f43880d..9267c8aad3329ddbc0eeaa85771012f116365974 100644 (file)
--- a/src/generic/vscroll.cpp
+++ b/src/generic/vscroll.cpp
@@ -17,10 +17,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "vscroll.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -37,6 +33,9 @@
 BEGIN_EVENT_TABLE(wxVScrolledWindow, wxPanel)
     EVT_SIZE(wxVScrolledWindow::OnSize)
     EVT_SCROLLWIN(wxVScrolledWindow::OnScroll)
+#if wxUSE_MOUSEWHEEL
+    EVT_MOUSEWHEEL(wxVScrolledWindow::OnMouseWheel)
+#endif
 END_EVENT_TABLE()
 
 
@@ -60,6 +59,10 @@ void wxVScrolledWindow::Init()
     m_nVisible = 1;
 
     m_heightTotal = 0;
+
+#if wxUSE_MOUSEWHEEL
+    m_sumWheelRotation = 0;
+#endif
 }
 
 // ----------------------------------------------------------------------------
@@ -213,7 +216,7 @@ void wxVScrolledWindow::RefreshLine(size_t line)
     wxRect rect;
     rect.width = GetClientSize().x;
     rect.height = OnGetLineHeight(line);
-    for ( size_t n = GetFirstVisibleLine(); n < line; n++ )
+    for ( size_t n = GetVisibleBegin(); n < line; n++ )
     {
         rect.y += OnGetLineHeight(n);
     }
@@ -228,21 +231,23 @@ void wxVScrolledWindow::RefreshLines(size_t from, size_t to)
 
     // clump the range to just the visible lines -- it is useless to refresh
     // the other ones
-    if ( from < GetFirstVisibleLine() )
-        from = GetFirstVisibleLine();
+    if ( from < GetVisibleBegin() )
+        from = GetVisibleBegin();
 
-    if ( to > GetLastVisibleLine() )
-        to = GetLastVisibleLine();
+    if ( to >= GetVisibleEnd() )
+        to = GetVisibleEnd();
+    else
+        to++;
 
     // calculate the rect occupied by these lines on screen
     wxRect rect;
     rect.width = GetClientSize().x;
-    for ( size_t nBefore = GetFirstVisibleLine(); nBefore < from; nBefore++ )
+    for ( size_t nBefore = GetVisibleBegin(); nBefore < from; nBefore++ )
     {
         rect.y += OnGetLineHeight(nBefore);
     }
 
-    for ( size_t nBetween = from; nBetween <= to; nBetween++ )
+    for ( size_t nBetween = from; nBetween < to; nBetween++ )
     {
         rect.height += OnGetLineHeight(nBetween);
     }
@@ -260,8 +265,8 @@ void wxVScrolledWindow::RefreshAll()
 
 int wxVScrolledWindow::HitTest(wxCoord WXUNUSED(x), wxCoord y) const
 {
-    const size_t lineMax = GetLastVisibleLine();
-    for ( size_t line = GetFirstVisibleLine(); line <= lineMax; line++ )
+    const size_t lineMax = GetVisibleEnd();
+    for ( size_t line = GetVisibleBegin(); line < lineMax; line++ )
     {
         y -= OnGetLineHeight(line);
         if ( y < 0 )
@@ -298,8 +303,8 @@ bool wxVScrolledWindow::ScrollToLine(size_t line)
 
 
     // remember the currently shown lines for the refresh code below
-    size_t lineFirstOld = GetFirstVisibleLine(),
-           lineLastOld = GetLastVisibleLine();
+    size_t lineFirstOld = GetVisibleBegin(),
+           lineLastOld = GetVisibleEnd();
 
     m_lineFirst = line;
 
@@ -310,8 +315,8 @@ bool wxVScrolledWindow::ScrollToLine(size_t line)
 
     // finally refresh the display -- but only redraw as few lines as possible
     // to avoid flicker
-    if ( GetFirstVisibleLine() > lineLastOld ||
-            GetLastVisibleLine() < lineFirstOld )
+    if ( GetVisibleBegin() >= lineLastOld ||
+            GetVisibleEnd() <= lineFirstOld )
     {
         // the simplest case: we don't have any old lines left, just redraw
         // everything
@@ -319,7 +324,7 @@ bool wxVScrolledWindow::ScrollToLine(size_t line)
     }
     else // overlap between the lines we showed before and should show now
     {
-        ScrollWindow(0, GetLinesHeight(GetFirstVisibleLine(), lineFirstOld));
+        ScrollWindow(0, GetLinesHeight(GetVisibleBegin(), lineFirstOld));
     }
 
     return true;
@@ -343,12 +348,14 @@ bool wxVScrolledWindow::ScrollPages(int pages)
         int line;
         if ( pages > 0 )
         {
-            line = GetLastVisibleLine();
+            line = GetVisibleEnd();
+            if ( line )
+                line--;
             pages--;
         }
         else // pages < 0
         {
-            line = FindFirstFromBottom(GetFirstVisibleLine());
+            line = FindFirstFromBottom(GetVisibleBegin());
             pages++;
         }
 
@@ -374,6 +381,7 @@ void wxVScrolledWindow::OnScroll(wxScrollWinEvent& event)
     size_t lineFirstNew;
 
     const wxEventType evtType = event.GetEventType();
+
     if ( evtType == wxEVT_SCROLLWIN_TOP )
     {
         lineFirstNew = 0;
@@ -396,23 +404,23 @@ void wxVScrolledWindow::OnScroll(wxScrollWinEvent& event)
     }
     else if ( evtType == wxEVT_SCROLLWIN_PAGEDOWN )
     {
-        lineFirstNew = GetLastVisibleLine();
+        lineFirstNew = GetVisibleEnd();
+        if ( lineFirstNew )
+            lineFirstNew--;
     }
-    else // unknown scroll event?
+    else if ( evtType == wxEVT_SCROLLWIN_THUMBRELEASE )
     {
-        if ( evtType == wxEVT_SCROLLWIN_THUMBRELEASE )
-        {
-            lineFirstNew = event.GetPosition();
-        }
-        else
-        {
-            wxASSERT_MSG( evtType == wxEVT_SCROLLWIN_THUMBTRACK,
-                            _T("unknown scroll event type?") );
+        lineFirstNew = event.GetPosition();
+    }
+    else if ( evtType == wxEVT_SCROLLWIN_THUMBTRACK )
+    {
+        lineFirstNew = event.GetPosition();
+    }
 
-            // don't do anything, otherwise dragging the thumb around would
-            // be too slow
-            return;
-        }
+    else // unknown scroll event?
+    {
+        wxFAIL_MSG( _T("unknown scroll event type?") );
+        return;
     }
 
     ScrollToLine(lineFirstNew);
@@ -422,3 +430,25 @@ void wxVScrolledWindow::OnScroll(wxScrollWinEvent& event)
 #endif // __WXMAC__
 }
 
+#if wxUSE_MOUSEWHEEL
+
+void wxVScrolledWindow::OnMouseWheel(wxMouseEvent& event)
+{
+    m_sumWheelRotation += event.GetWheelRotation();
+    int delta = event.GetWheelDelta();
+
+    // how much to scroll this time
+    int units_to_scroll = -(m_sumWheelRotation/delta);
+    if ( !units_to_scroll )
+        return;
+
+    m_sumWheelRotation += units_to_scroll*delta;
+
+    if ( !event.IsPageScroll() )
+        ScrollLines( units_to_scroll*event.GetLinesPerAction() );
+    else
+        // scroll pages instead of lines
+        ScrollPages( units_to_scroll );
+}
+
+#endif