First implementation of the alert bar #2822

Hooked it up to the activity window as well

3 files changed, 170 insertions, 3 deletions

diff --git a/sugar/graphics/Makefile.am b/sugar/graphics/Makefile.am
index 1e2d4c2..df2f472 100644
--- a/sugar/graphics/Makefile.am
+++ b/sugar/graphics/Makefile.am
@@ -1,6 +1,7 @@
 sugardir = $(pythondir)/sugar/graphics
 sugar_PYTHON =			\
 	__init__.py		\
+        alert.py                \
 	animator.py		\
 	combobox.py		\
 	entry.py		\
diff --git a/sugar/graphics/alert.py b/sugar/graphics/alert.py
new file mode 100644
index 0000000..2fd54f8
--- /dev/null
+++ b/sugar/graphics/alert.py
@@ -0,0 +1,150 @@
+from gettext import gettext as _
+
+import gtk
+import gobject
+
+from sugar.graphics import style
+from sugar.graphics.icon import Icon
+
+
+class Alert(gtk.EventBox, gobject.GObject):
+    """UI interface for Alerts
+
+    Alerts are used inside the activity window instead of being a
+    separate popup window. They do not hide canvas content. You can
+    use add_alert(widget, position) and remove_alert(widget) inside
+    your activity to add and remove the alert.
+
+    Properties:
+        'title': the title of the alert,
+        'message': the message of the alert,
+        'icon': the icon that appears at the far left
+    See __gproperties__
+    """
+
+    __gtype_name__ = 'SugarAlert'
+
+    __gsignals__ = {
+        'response': (gobject.SIGNAL_RUN_FIRST,
+                        gobject.TYPE_NONE, ([int]))
+        }
+
+    __gproperties__ = {
+        'title'  : (str, None, None, None,
+                    gobject.PARAM_READWRITE),
+        'msg'    : (str, None, None, None,
+                    gobject.PARAM_READWRITE),
+        'icon'   : (object, None, None,
+                    gobject.PARAM_WRITABLE)
+        }
+
+    def __init__(self, **kwargs):
+        gobject.GObject.__init__(self)
+
+        self.set_visible_window(True)
+        self._hbox = gtk.HBox()
+        self.add(self._hbox)
+
+        self._title = None
+        self._msg = None
+        self._icon = None
+        self._timeout = 0
+        self._buttons = {}
+
+        self._msg_box = gtk.VBox()
+        self._title_label = gtk.Label()
+        size = style.zoom(style.GRID_CELL_SIZE * 0.5)
+        self._title_label.set_alignment(0, 0.5)
+        self._title_label.set_padding(style.DEFAULT_SPACING, 0)
+        self._msg_box.pack_start(self._title_label, False)
+        self._title_label.show()
+
+        self._msg_label = gtk.Label()
+        self._msg_label.set_alignment(0, 0.5)
+        self._msg_label.set_padding(style.DEFAULT_SPACING, 0)
+        self._msg_box.pack_start(self._msg_label, False)
+        self._msg_label.show()
+        self._hbox.pack_start(self._msg_box)
+
+        self._buttons_box = gtk.HButtonBox()
+        self._buttons_box.set_layout(gtk.BUTTONBOX_SPREAD)
+        self._hbox.pack_start(self._buttons_box)
+        self._buttons_box.show()
+
+        self._msg_box.show()
+
+        self._hbox.show()
+        self.show()
+
+    def do_set_property(self, pspec, value):
+        if pspec.name == 'title':
+            if self._title != value:
+                self._title = value
+                self._title_label.set_markup("<b>" + self._title + "</b>")
+        elif pspec.name == 'msg':
+            if self._msg != value:
+                self._msg = value
+                self._msg_label.set_markup(self._msg)
+        elif pspec.name == 'icon':
+            if self._icon != value:
+                self._icon = value
+                self._hbox.pack_start(self._icon)
+                self._hbox.reorder_child(self._icon, 0)
+
+    def do_get_property(self, pspec):
+        if pspec.name == 'title':
+            return self._title
+        elif pspec.name == 'msg':
+            return self._msg
+
+    def add_button(self, response_id, label, icon, position=-1):
+        """Add a button to the alert
+
+        response_id: will be emitted with the response signal
+        label: that will occure right to the buttom
+        icon: this can be a SugarIcon or a gtk.Image
+        position: the position of the button in the box (optional)
+        """
+        button = gtk.Button()
+        self._buttons[response_id] = button
+        button.set_image(icon)
+        button.set_label(label)
+        self._buttons_box.pack_start(button)
+        button.show()
+        button.connect('clicked', self.__button_clicked_cb, response_id)
+        if position != -1:
+            self._buttons_box.reorder_child(button, position)
+        return button
+
+    def remove_button(self, response_id):
+        """Remove a button from the alert by the given button id"""
+        self._buttons_box.remove(self._buttons[id])
+
+    def _response(self, id):
+        """Emitting response when we have a result
+
+        A result can be that a user has clicked a button or
+        a timeout has occured, the id identifies the button
+        that has been clicked and -1 for a timeout
+        """
+        self.emit('response', id)
+
+    def __button_clicked_cb(self, button, response_id):
+        self._response(response_id)
+
+
+class ConfirmationAlert(Alert):
+    """This is a ready-made two button (Cancel,Ok) alert"""
+
+    def __init__(self, **kwargs):
+        Alert.__init__(self, **kwargs)
+
+        icon = Icon(icon_name='dialog-cancel')
+        cancel_button = self.add_button(0, _('Cancel'), icon)
+        icon.show()
+
+        icon = Icon(icon_name='dialog-ok')
+        ok_button = self.add_button(1, _('Ok'), icon)
+        icon.show()
+
+
diff --git a/sugar/graphics/window.py b/sugar/graphics/window.py
index 28fdb35..e6081fe 100644
--- a/sugar/graphics/window.py
+++ b/sugar/graphics/window.py
@@ -25,10 +25,12 @@ class Window(gtk.Window):
         self.connect('realize', self._window_realize_cb)
 
         self.toolbox = None
+        self._alerts = []
+        self.alert_position = -1
         self.canvas = None
-    
+
         self._vbox = gtk.VBox()
-        self.add(self._vbox)        
+        self.add(self._vbox)
         self._vbox.show()
 
     def set_canvas(self, canvas):
@@ -48,7 +50,21 @@ class Window(gtk.Window):
         self._vbox.reorder_child(toolbox, 0)
         
         self.toolbox = toolbox
-        
+
+    def add_alert(self, alert):
+        self._alerts.append(alert)
+        if len(self._alerts) == 1:
+            self._vbox.pack_start(alert, False)
+            self._vbox.reorder_child(alert, self.alert_position)
+
+    def remove_alert(self, alert):
+        if alert in self._alerts:
+            self._alerts.remove(alert)
+            self._vbox.remove(alert)
+            if len(self._alerts) >= 1:
+                self._vbox.pack_start(self._alerts[0], False)
+                self._vbox.reorder_child(self._alerts[0], self.alert_position)
+
     def _window_realize_cb(self, window):
         group = gtk.Window()
         group.realize()