X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8e609c82594a57104ff5e0d4044b2e2697a4b576..56eebcdac22b3dff33f0aa833e8ed41adc5e79df:/src/generic/scrlwing.cpp

diff --git a/src/generic/scrlwing.cpp b/src/generic/scrlwing.cpp
index 442efe3f83..99e9a43640 100644
--- a/src/generic/scrlwing.cpp
+++ b/src/generic/scrlwing.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        src/generic/scrolwin.cpp
+// Name:        src/generic/scrlwing.cpp
 // Purpose:     wxScrolledWindow implementation
 // Author:      Julian Smart
 // Modified by: Vadim Zeitlin on 31.08.00: wxScrollHelper allows to implement.
@@ -34,14 +34,13 @@
 #ifndef WX_PRECOMP
     #include "wx/utils.h"
     #include "wx/panel.h"
+    #include "wx/dcclient.h"
+    #if wxUSE_TIMER
+        #include "wx/timer.h"
+    #endif
+    #include "wx/sizer.h"
 #endif
 
-#include "wx/dcclient.h"
-
-#if wxUSE_TIMER
-#include "wx/timer.h"
-#endif
-#include "wx/sizer.h"
 #include "wx/recguard.h"
 
 #ifdef __WXMSW__
@@ -312,6 +311,8 @@ wxScrollHelper::wxScrollHelper(wxWindow *win)
     m_handler = NULL;
 
     m_win = win;
+    
+    m_win->SetScrollHelper( this );
 
     // by default, the associated window is also the target window
     DoSetTargetWindow(win);
@@ -461,21 +462,10 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
         return;
     }
 
-    int orient = event.GetOrientation();
-    if (orient == wxHORIZONTAL)
-    {
-        m_xScrollPosition += nScrollInc;
-        m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
-    }
-    else
-    {
-        m_yScrollPosition += nScrollInc;
-        m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
-    }
-
     bool needsRefresh = false;
     int dx = 0,
         dy = 0;
+    int orient = event.GetOrientation();
     if (orient == wxHORIZONTAL)
     {
        if ( m_xScrollingEnabled )
@@ -499,6 +489,25 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
         }
     }
 
+    if ( !needsRefresh )
+    {
+        // flush all pending repaints before we change m_{x,y}ScrollPosition, as
+        // otherwise invalidated area could be updated incorrectly later when
+        // ScrollWindow() makes sure they're repainted before scrolling them
+        m_targetWindow->Update();
+    }
+
+    if (orient == wxHORIZONTAL)
+    {
+        m_xScrollPosition += nScrollInc;
+        m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
+    }
+    else
+    {
+        m_yScrollPosition += nScrollInc;
+        m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
+    }
+
     if ( needsRefresh )
     {
         m_targetWindow->Refresh(true, GetScrollRect());
@@ -814,8 +823,17 @@ void wxScrollHelper::AdjustScrollbars()
 void wxScrollHelper::DoPrepareDC(wxDC& dc)
 {
     wxPoint pt = dc.GetDeviceOrigin();
-    dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
-                        pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
+#ifdef __WXGTK__
+    // It may actually be correct to always query
+    // the m_sign from the DC here, but I leve the
+    // #ifdef GTK for now.
+    if (m_win->GetLayoutDirection() == wxLayout_RightToLeft)
+        dc.SetDeviceOrigin( pt.x + m_xScrollPosition * m_xScrollPixelsPerLine,
+                            pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
+    else
+#endif
+        dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
+                            pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
     dc.SetUserScale( m_scaleX, m_scaleY );
 }
 
@@ -845,6 +863,15 @@ void wxScrollHelper::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
         *y_unit = m_yScrollPixelsPerLine;
 }
 
+
+int wxScrollHelper::GetScrollLines( int orient ) const
+{
+    if ( orient == wxHORIZONTAL )
+        return m_xScrollLines;
+    else
+        return m_yScrollLines;
+}
+
 int wxScrollHelper::GetScrollPageSize(int orient) const
 {
     if ( orient == wxHORIZONTAL )
@@ -875,47 +902,64 @@ void wxScrollHelper::Scroll( int x_pos, int y_pos )
     int w = 0, h = 0;
     GetTargetSize(&w, &h);
 
+    // compute new position:
+    int new_x = m_xScrollPosition;
+    int new_y = m_yScrollPosition;
+
     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
     {
-        int old_x = m_xScrollPosition;
-        m_xScrollPosition = x_pos;
+        new_x = x_pos;
 
         // Calculate page size i.e. number of scroll units you get on the
         // current client window
-        int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
+        int noPagePositions = w/m_xScrollPixelsPerLine;
         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         // the visible portion of it or if below zero
-        m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
-        m_xScrollPosition = wxMax( 0, m_xScrollPosition );
-
-        if (old_x != m_xScrollPosition) {
-            m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
-            m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
-                                          GetScrollRect() );
-        }
+        new_x = wxMin( m_xScrollLines-noPagePositions, new_x );
+        new_x = wxMax( 0, new_x );
     }
     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
     {
-        int old_y = m_yScrollPosition;
-        m_yScrollPosition = y_pos;
+        new_y = y_pos;
 
         // Calculate page size i.e. number of scroll units you get on the
         // current client window
-        int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
+        int noPagePositions = h/m_yScrollPixelsPerLine;
         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         // the visible portion of it or if below zero
-        m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
-        m_yScrollPosition = wxMax( 0, m_yScrollPosition );
+        new_y = wxMin( m_yScrollLines-noPagePositions, new_y );
+        new_y = wxMax( 0, new_y );
+    }
 
-        if (old_y != m_yScrollPosition) {
-            m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
-            m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
-                                          GetScrollRect() );
-        }
+    if ( new_x == m_xScrollPosition && new_y == m_yScrollPosition )
+        return; // nothing to do, the position didn't change
+
+    // flush all pending repaints before we change m_{x,y}ScrollPosition, as
+    // otherwise invalidated area could be updated incorrectly later when
+    // ScrollWindow() makes sure they're repainted before scrolling them
+    m_targetWindow->Update();
+
+    // update the position and scroll the window now:
+    if (m_xScrollPosition != new_x)
+    {
+        int old_x = m_xScrollPosition;
+        m_xScrollPosition = new_x;
+        m_win->SetScrollPos( wxHORIZONTAL, new_x );
+        m_targetWindow->ScrollWindow( (old_x-new_x)*m_xScrollPixelsPerLine, 0,
+                                      GetScrollRect() );
+    }
+
+    if (m_yScrollPosition != new_y)
+    {
+        int old_y = m_yScrollPosition;
+        m_yScrollPosition = new_y;
+        m_win->SetScrollPos( wxVERTICAL, new_y );
+        m_targetWindow->ScrollWindow( 0, (old_y-new_y)*m_yScrollPixelsPerLine,
+                                      GetScrollRect() );
     }
 }