2 files changed, 12 insertions, 4 deletions
diff --git a/dw/fltkviewport.cc b/dw/fltkviewport.cc
index b8f4e51e..e9169495 100644
--- a/dw/fltkviewport.cc
+++ b/dw/fltkviewport.cc
@@ -73,6 +73,7 @@ FltkViewport::FltkViewport (int X, int Y, int W, int H, const char *label):
    scrollX = scrollY = scrollDX = scrollDY = 0;
    horScrolling = verScrolling = dragScrolling = 0;
    scrollbarPageMode = false;
+   pageOverlap = 50;
 
    gadgetOrientation[0] = GADGET_HORIZONTAL;
    gadgetOrientation[1] = GADGET_HORIZONTAL;
@@ -434,6 +435,11 @@ void FltkViewport::setScrollStep(int step)
    hscrollbar->linesize(step);
 }
 
+void FltkViewport::setPageOverlap(int overlap)
+{
+   pageOverlap = overlap;
+}
+
 void FltkViewport::setScrollbarPageMode(bool enable)
 {
    scrollbarPageMode = enable;
@@ -493,13 +499,13 @@ void FltkViewport::scroll (int dx, int dy)
 void FltkViewport::scroll (core::ScrollCommand cmd)
 {
    if (cmd == core::SCREEN_UP_CMD) {
-      scroll (0, -h () + vscrollbar->linesize ());
+      scroll (0, -h () + pageOverlap);
    } else if (cmd == core::SCREEN_DOWN_CMD) {
-      scroll (0, h () - vscrollbar->linesize ());
+      scroll (0, h () - pageOverlap);
    } else if (cmd == core::SCREEN_LEFT_CMD) {
-      scroll (-w() + hscrollbar->linesize (), 0);
+      scroll (-w() + pageOverlap, 0);
    } else if (cmd == core::SCREEN_RIGHT_CMD) {
-      scroll (w() - hscrollbar->linesize (), 0);
+      scroll (w() - pageOverlap, 0);
    } else if (cmd == core::LINE_UP_CMD) {
       scroll (0, -vscrollbar->linesize ());
    } else if (cmd == core::LINE_DOWN_CMD) {
diff --git a/dw/fltkviewport.hh b/dw/fltkviewport.hh
index 62d4fa21..2cff42d3 100644
--- a/dw/fltkviewport.hh
+++ b/dw/fltkviewport.hh
@@ -45,6 +45,7 @@ private:
    int hasDragScroll, dragScrolling, dragX, dragY;
    int horScrolling, verScrolling;
    bool scrollbarPageMode;
+   int pageOverlap;
 
    Fl_Scrollbar *vscrollbar, *hscrollbar;
 
@@ -100,6 +101,7 @@ public:
    void addGadget (Fl_Widget *gadget);
    void setScrollbarOnLeft (bool enable);
    void setScrollbarPageMode(bool enable);
+   void setPageOverlap(int overlap);
 };
 
 } // namespace fltk