X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/259858fc6a55dd1f611dbec323264fdbad8b44fb..dcae64c221450a7ca9b530ecf44757543c33a754:/src/gtk/window.cpp

diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 43673380dc..e573871d0d 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -3652,6 +3652,39 @@ void wxWindowGTK::WarpPointer( int x, int y )
         gdk_window_warp_pointer( window, x, y );
 }
 
+static bool wxScrollAdjust(GtkAdjustment* adj, double change)
+{
+    double value_start = adj->value;
+    double value = value_start + change;
+    double upper = adj->upper - adj->page_size;
+    if (value > upper)
+    {
+        value = upper;
+    }
+    // Lower bound will be checked by gtk_adjustment_set_value
+    gtk_adjustment_set_value(adj, value);
+    return adj->value != value_start;
+}
+
+bool wxWindowGTK::ScrollLines(int lines)
+{
+    return
+        m_vAdjust != NULL &&
+        wxScrollAdjust(m_vAdjust, lines * m_vAdjust->step_increment);
+}
+
+bool wxWindowGTK::ScrollPages(int pages)
+{
+    return
+        m_vAdjust != NULL &&
+        wxScrollAdjust(m_vAdjust, pages * m_vAdjust->page_increment);
+}
+
+void wxWindowGTK::SetVScrollAdjustment(GtkAdjustment* adj)
+{
+    wxASSERT(m_vAdjust == NULL);
+    m_vAdjust = adj;
+}
 
 void wxWindowGTK::Refresh( bool eraseBackground, const wxRect *rect )
 {