1 files changed, 85 insertions, 0 deletions
diff --git a/port/temposlider.py b/port/temposlider.py
new file mode 100644
index 0000000..9d14be8
--- /dev/null
+++ b/port/temposlider.py
@@ -0,0 +1,85 @@
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import os
+import gtk
+
+from sugar.graphics import style
+
+class TempoSlider(gtk.HBox):
+    def __init__(self, min_value, max_value):
+        gtk.HBox.__init__(self)
+
+        self._pixbuf = [None] * 8
+        self._image = gtk.Image()
+        self._image.show()
+
+        # used to store tempo updates while the slider is active
+        self._delayed = 0 
+        self._active = False
+
+        self.adjustment = gtk.Adjustment(min_value, min_value, max_value,
+                (max_value - min_value) / 8, (max_value - min_value) / 8, 0)
+        self._adjustment_h = self.adjustment.connect('value-changed',
+                self._changed_cb)
+
+        slider = gtk.HScale(adjustment = self.adjustment)
+        slider.show()
+        slider.set_draw_value(False)
+        slider.connect("button-press-event", self._press_cb)
+        slider.connect("button-release-event", self._release_cb)
+
+        self.pack_start(slider, True, True)
+        self.pack_end(self._image, False, False)
+
+    def set_value(self, tempo, quiet = False):
+        if self._active:
+            self._delayed = tempo
+        elif quiet:
+            self.adjustment.handler_block(self._adjustment_h)
+            self.adjustment.set_value(tempo)
+            self._update(tempo)
+            self.adjustment.handler_unblock(self._adjustment_h)
+        else:
+            self.adjustment.set_value(tempo)
+
+    def _changed_cb(self, widget):
+        self._update(widget.get_value())
+
+    def _update(self, tempo):
+        def map_range(value, ilower, iupper, olower, oupper):
+            if value == iupper:
+                return oupper
+            return olower + int((oupper-olower+1) * (value-ilower) /
+                    float(iupper-ilower))
+
+        img = map_range(tempo, self.adjustment.lower,
+                            self.adjustment.upper, 0, 7)
+
+        if not self._pixbuf[img]:
+            self._pixbuf[img] = gtk.gdk.pixbuf_new_from_file_at_size(
+                    os.path.join(os.path.dirname(__file__), 'images',
+                        'tempo' + str(img+1) + '.svg'),
+                    style.STANDARD_ICON_SIZE, style.STANDARD_ICON_SIZE)
+
+        self._image.set_from_pixbuf(self._pixbuf[img])
+
+    def _press_cb(self, widget, event):
+        self._active = True
+
+    def _release_cb(self, widget, event):
+        self._active = False
+        if self._delayed != 0:
+            self.set_value(self._delayed, True)
+            self._delayed = 0