From 2f6cfeaa40169abc01069a2ee98134d474ca632b Mon Sep 17 00:00:00 2001
From: Aleksey Lim <alsroot@member.fsf.org>
Date: Mon, 19 Jan 2009 23:09:56 +0000
Subject: ...

---
(limited to 'Utils.py')

diff --git a/Utils.py b/Utils.py
index d16b605..83c38f4 100644
--- a/Utils.py
+++ b/Utils.py
@@ -16,6 +16,7 @@ import gtk
 
 from Theme import *
 import sugar.graphics
+from sugar.graphics import style
 
 class FileInstanceVariable:
     def __init__(self, value = None):
@@ -72,3 +73,70 @@ class ComboBox(sugar.graphics.combobox.ComboBox):
             self._model.insert(position, [action_id, text, pixbuf, False])
         else:
             self._model.append([action_id, text, pixbuf, False])
+
+def map_range(value, ilower, iupper, olower, oupper):
+    if value == iupper:
+        return oupper
+    return olower + int((oupper-olower+1) * (value-ilower) /
+            float(iupper-ilower))
+
+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):
+        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(get_bundle_path(), 'images/icons/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
--
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