README change

1 files changed, 49 insertions, 0 deletions

diff --git a/gr-wxgui/src/python/slider.py b/gr-wxgui/src/python/slider.py
new file mode 100644
index 000000000..e8cdcfcac
--- /dev/null
+++ b/gr-wxgui/src/python/slider.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+
+import wx
+
+def slider(parent, min, max, callback):
+    """
+    Return a wx.Slider object.
+
+    @param min: minimum slider value
+    @type min: float
+    @param max: maximum slider value
+    @type max: float
+    @param callback: function of one arg invoked when slider moves.
+    @rtype: wx.Slider
+    """
+    new_id = wx.NewId()
+    s = wx.Slider(parent, new_id, (max+min)/2, min, max, wx.DefaultPosition,
+                  wx.Size(250,-1), wx.SL_HORIZONTAL | wx.SL_LABELS)
+    wx.EVT_COMMAND_SCROLL(parent, new_id,
+                          lambda evt : callback(evt.GetInt()))
+    return s
+
+
+# ----------------------------------------------------------------
+# 		             Demo app
+# ----------------------------------------------------------------
+if __name__ == '__main__':
+
+    from gnuradio.wxgui import stdgui
+
+    class demo_graph(stdgui.gui_flow_graph):
+
+        def __init__(self, frame, panel, vbox, argv):
+            stdgui.gui_flow_graph.__init__ (self, frame, panel, vbox, argv)
+
+            vbox.Add(slider(panel, 23, 47, self.my_callback1), 1, wx.ALIGN_CENTER)
+            vbox.Add(slider(panel, -100, 100, self.my_callback2), 1, wx.ALIGN_CENTER)
+
+        def my_callback1(self, val):
+            print "cb1 = ", val
+
+        def my_callback2(self, val):
+            print "cb2 = ", val
+
+    def main ():
+        app = stdgui.stdapp (demo_graph, "Slider Demo")
+        app.MainLoop ()
+
+    main ()