X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/0b49ccf8d66e2568e2b0de85c25b406aad39f3b1..6493aacaeb7b22b9fa35c559f7753e9fec0da71f:/src/generic/vscroll.cpp

diff --git a/src/generic/vscroll.cpp b/src/generic/vscroll.cpp
index 4a9cc64d7c..3fc8a940d5 100644
--- a/src/generic/vscroll.cpp
+++ b/src/generic/vscroll.cpp
@@ -17,6 +17,13 @@
 // headers
 // ----------------------------------------------------------------------------
 
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+#pragma hdrstop
+#endif
+
 #include "wx/vscroll.h"
 
 // ----------------------------------------------------------------------------
@@ -26,6 +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()
 
 
@@ -33,6 +43,8 @@ END_EVENT_TABLE()
 // implementation
 // ============================================================================
 
+IMPLEMENT_ABSTRACT_CLASS(wxVScrolledWindow, wxPanel)
+
 // ----------------------------------------------------------------------------
 // initialization
 // ----------------------------------------------------------------------------
@@ -47,12 +59,48 @@ void wxVScrolledWindow::Init()
     m_nVisible = 1;
 
     m_heightTotal = 0;
+
+#if wxUSE_MOUSEWHEEL
+    m_sumWheelRotation = 0;
+#endif
 }
 
 // ----------------------------------------------------------------------------
 // various helpers
 // ----------------------------------------------------------------------------
 
+wxCoord wxVScrolledWindow::EstimateTotalHeight() const
+{
+    // estimate the total height: it is impossible to call
+    // OnGetLineHeight() for every line because there may be too many of
+    // them, so we just make a guess using some lines in the beginning,
+    // some in the end and some in the middle
+    static const size_t NUM_LINES_TO_SAMPLE = 10;
+
+    wxCoord heightTotal;
+    if ( m_lineMax < 3*NUM_LINES_TO_SAMPLE )
+    {
+        // in this case calculating exactly is faster and more correct than
+        // guessing
+        heightTotal = GetLinesHeight(0, m_lineMax);
+    }
+    else // too many lines to calculate exactly
+    {
+        // look at some lines in the beginning/middle/end
+        heightTotal =
+            GetLinesHeight(0, NUM_LINES_TO_SAMPLE) +
+                GetLinesHeight(m_lineMax - NUM_LINES_TO_SAMPLE, m_lineMax) +
+                    GetLinesHeight(m_lineMax/2 - NUM_LINES_TO_SAMPLE/2,
+                                   m_lineMax/2 + NUM_LINES_TO_SAMPLE/2);
+
+        // use the height of the lines we looked as the average
+        heightTotal = (wxCoord)
+                (((float)heightTotal / (3*NUM_LINES_TO_SAMPLE)) * m_lineMax);
+    }
+
+    return heightTotal;
+}
+
 wxCoord wxVScrolledWindow::GetLinesHeight(size_t lineMin, size_t lineMax) const
 {
     if ( lineMin == lineMax )
@@ -123,6 +171,25 @@ void wxVScrolledWindow::UpdateScrollbar()
         h += OnGetLineHeight(line);
     }
 
+    // if we still have remaining space below, maybe we can fit everything?
+    if ( h < hWindow )
+    {
+        wxCoord hAll = h;
+        for ( size_t lineFirst = m_lineFirst; lineFirst > 0; lineFirst-- )
+        {
+            hAll += OnGetLineHeight(m_lineFirst - 1);
+            if ( hAll > hWindow )
+                break;
+        }
+
+        if ( hAll < hWindow )
+        {
+            // we don't need scrollbar at all
+            m_lineFirst = 0;
+            SetScrollbar(wxVERTICAL, 0, 0, 0);
+        }
+    }
+
     m_nVisible = line - m_lineFirst;
 
     int pageSize = m_nVisible;
@@ -147,33 +214,8 @@ void wxVScrolledWindow::SetLineCount(size_t count)
     // save the number of lines
     m_lineMax = count;
 
-
-    // estimate the total height: it is impossible to call
-    // OnGetLineHeight() for every line because there may be too many of
-    // them, so we just make a guess using some lines in the beginning,
-    // some in the end and some in the middle
-    static const size_t NUM_LINES_TO_SAMPLE = 10;
-
-    if ( count < 3*NUM_LINES_TO_SAMPLE )
-    {
-        // in this case calculating exactly is faster and more correct than
-        // guessing
-        m_heightTotal = GetLinesHeight(0, m_lineMax);
-    }
-    else // too many lines to calculate exactly
-    {
-        // look at some lines in the beginning/middle/end
-        m_heightTotal =
-            GetLinesHeight(0, NUM_LINES_TO_SAMPLE) +
-                GetLinesHeight(count - NUM_LINES_TO_SAMPLE, count) +
-                    GetLinesHeight(count/2 - NUM_LINES_TO_SAMPLE/2,
-                                   count/2 + NUM_LINES_TO_SAMPLE/2);
-
-        // use the height of the lines we looked as the average
-        m_heightTotal = (wxCoord)
-                (((float)m_heightTotal / (3*NUM_LINES_TO_SAMPLE)) * m_lineMax);
-    }
-
+    // and our estimate for their total height
+    m_heightTotal = EstimateTotalHeight();
 
     // recalculate the scrollbars parameters
     m_lineFirst = 1;    // make sure it is != 0
@@ -193,7 +235,7 @@ 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);
     }
@@ -202,6 +244,37 @@ void wxVScrolledWindow::RefreshLine(size_t line)
     RefreshRect(rect);
 }
 
+void wxVScrolledWindow::RefreshLines(size_t from, size_t to)
+{
+    wxASSERT_MSG( from <= to, _T("RefreshLines(): empty range") );
+
+    // clump the range to just the visible lines -- it is useless to refresh
+    // the other ones
+    if ( from < GetVisibleBegin() )
+        from = GetVisibleBegin();
+
+    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 = GetVisibleBegin(); nBefore < from; nBefore++ )
+    {
+        rect.y += OnGetLineHeight(nBefore);
+    }
+
+    for ( size_t nBetween = from; nBetween < to; nBetween++ )
+    {
+        rect.height += OnGetLineHeight(nBetween);
+    }
+
+    // do refresh it
+    RefreshRect(rect);
+}
+
 void wxVScrolledWindow::RefreshAll()
 {
     UpdateScrollbar();
@@ -211,8 +284,8 @@ 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 )
@@ -249,8 +322,8 @@ 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;
 
@@ -261,8 +334,8 @@ 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
@@ -270,7 +343,7 @@ 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;
@@ -294,12 +367,14 @@ 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++;
         }
 
@@ -325,6 +400,7 @@ void wxVScrolledWindow::OnScroll(wxScrollWinEvent& event)
     size_t lineFirstNew;
 
     const wxEventType evtType = event.GetEventType();
+
     if ( evtType == wxEVT_SCROLLWIN_TOP )
     {
         lineFirstNew = 0;
@@ -347,23 +423,23 @@ 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);
@@ -373,3 +449,26 @@ 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 // wxUSE_MOUSEWHEEL
+