From a884783172da16ed1181f3d01dcf3b3311c38c55 Mon Sep 17 00:00:00 2001
From: Sascha Silbe <silbe@activitycentral.com>
Date: Mon, 21 Mar 2011 11:57:35 +0000
Subject: add MultiModeWindow

---
diff --git a/src/sugar/graphics/window.py b/src/sugar/graphics/window.py
index dbac464..506c046 100644
--- a/src/sugar/graphics/window.py
+++ b/src/sugar/graphics/window.py
@@ -20,12 +20,16 @@
 STABLE.
 """
 
+import time
+
 import gobject
 import gtk
+import logging
 import warnings
 
 from sugar.graphics.icon import Icon
 from sugar.graphics import palettegroup
+from sugar.logger import trace
 
 
 _UNFULLSCREEN_BUTTON_VISIBILITY_TIMEOUT = 2
@@ -295,3 +299,348 @@ class Window(gtk.Window):
         return self._toolbar_box
 
     toolbox = property(get_toolbox, set_toolbox)
+
+
+class MultiModeWindow(gtk.Window):
+    """
+    A window that can switch between several independent views (modes)
+
+    A transition effect may be provided when switching between modes.
+    """
+
+    _SCROLL_INTERVAL_MS = 40
+    _SCROLL_TIME_MS = 500
+    _SCROLL_STEPS = _SCROLL_TIME_MS // _SCROLL_INTERVAL_MS
+
+    def __init__(self, modes, **args):
+        self._enable_fullscreen_mode = True
+
+        gtk.Window.__init__(self, **args)
+
+        self.set_decorated(False)
+        self.maximize()
+        self.connect('realize', self.__window_realize_cb)
+        self.connect('key-press-event', self.__key_press_cb)
+
+        self._modes = modes
+        self._toolbar_boxes = {}
+        self._alerts = dict([(mode, []) for mode in modes])
+        self._canvasses = {}
+        self._trays = {}
+        self.__vboxes = {}
+        self.__hboxes = {}
+        self.__event_boxes = {}
+        self._current_mode = modes[0]
+        self._next_mode = None
+        self.__layout = gtk.Layout()
+        self.__layout.show()
+        self.__width = 0
+        self.__height = 0
+        self.__scroll_step = 0
+        self.__scroll_direction = 1
+        self.__scroll_start_time = None
+
+        for mode in modes:
+            self.__vboxes[mode] = gtk.VBox()
+            self.__hboxes[mode] = gtk.HBox()
+            self.__vboxes[mode].pack_start(self.__hboxes[mode])
+            self.__hboxes[mode].show()
+
+            event_box = gtk.EventBox()
+            self.__event_boxes[mode] = event_box
+            self.__hboxes[mode].pack_start(event_box)
+            event_box.show()
+            event_box.add_events(gtk.gdk.POINTER_MOTION_HINT_MASK
+                                 | gtk.gdk.POINTER_MOTION_MASK)
+            event_box.connect('motion-notify-event', self.__motion_notify_cb)
+
+            self.__vboxes[mode].show()
+
+        self.connect('configure-event', self.__configure_cb)
+        self.add(self.__vboxes[self._current_mode])
+
+        self._is_fullscreen = False
+        self._unfullscreen_button = UnfullscreenButton()
+        self._unfullscreen_button.set_transient_for(self)
+        self._unfullscreen_button.connect_button_press(
+            self.__unfullscreen_button_pressed)
+        self._unfullscreen_button_timeout_id = None
+
+    @trace()
+    def switch_to_mode(self, mode):
+        if mode == self._current_mode:
+            return
+
+        if False:  # TODO: config option for disabling scrolling
+            self.remove(self.__vboxes[self._current_mode])
+            self._current_mode = mode
+            self.add(self.__vboxes[mode])
+            return
+
+        if self.child != self.__layout:
+            # work around a race condition on start-up
+            self.remove(self.__vboxes[self._current_mode])
+            self.__layout.add(self.__vboxes[self._current_mode])
+            self.add(self.__layout)
+
+        if self._next_mode is not None:
+            self._switch_mode_now()
+
+        self._next_mode = mode
+        self.__scroll_step = 0
+        self.__scroll_start_time = time.time()
+        if self._modes.index(self._current_mode) < self._modes.index(mode):
+            self.__scroll_direction = 1
+        else:
+            self.__scroll_direction = -1
+
+        self.__vboxes[mode].hide()
+        self.__layout.put(self.__vboxes[mode],
+                          self.__width * self.__scroll_direction, 0)
+        self.__vboxes[mode].resize_children()
+        self.__vboxes[mode].show()
+        gobject.timeout_add(MultiModeWindow._SCROLL_INTERVAL_MS,
+                            self.__scroll_cb)
+
+    @trace()
+    def reveal(self):
+        """
+        Make window active.
+
+        In contrast with present(), brings window to the top
+        even after invoking on response on non-gtk events.
+        See SL#1423.
+        """
+        if self.window is None:
+            self.show()
+            return
+        timestamp = gtk.get_current_event_time()
+        if not timestamp:
+            timestamp = gtk.gdk.x11_get_server_time(self.window)
+        self.window.focus(timestamp)
+
+    def fullscreen(self):
+        palettegroup.popdown_all()
+        if self._current_mode in self._toolbar_boxes:
+            self._toolbar_boxes[self._current_mode].hide()
+        if self._current_mode in self._trays:
+            self._trays[self._current_mode].hide()
+
+        self._is_fullscreen = True
+
+        if self.props.enable_fullscreen_mode:
+            self._unfullscreen_button.show()
+
+            if self._unfullscreen_button_timeout_id is not None:
+                gobject.source_remove(self._unfullscreen_button_timeout_id)
+                self._unfullscreen_button_timeout_id = None
+
+            self._unfullscreen_button_timeout_id = \
+                gobject.timeout_add_seconds( \
+                    _UNFULLSCREEN_BUTTON_VISIBILITY_TIMEOUT, \
+                    self.__unfullscreen_button_timeout_cb)
+
+    def unfullscreen(self):
+        if self._current_mode in self._toolbar_boxes:
+            self._toolbar_boxes[self._current_mode].show()
+        if self._current_mode in self._trays:
+            self._trays[self._current_mode].show()
+
+        self._is_fullscreen = False
+
+        if self.props.enable_fullscreen_mode:
+            self._unfullscreen_button.hide()
+
+            if self._unfullscreen_button_timeout_id:
+                gobject.source_remove(self._unfullscreen_button_timeout_id)
+                self._unfullscreen_button_timeout_id = None
+
+    @trace()
+    def get_canvas(self, mode):
+        return self._canvas.get(mode)
+
+    @trace()
+    def set_canvas(self, mode, canvas):
+        if mode in self._canvasses:
+            old_canvas = self._canvasses.pop(self._current_mode)
+            self.__event_boxes[mode].remove(old_canvas)
+
+        if not canvas:
+            return
+
+        self.__event_boxes[mode].add(canvas)
+        self._canvasses[mode] = canvas
+        self.__vboxes[mode].set_focus_child(canvas)
+
+    @trace()
+    def get_toolbar_box(self, mode):
+        return self._toolbar_boxes.get(mode)
+
+    @trace()
+    def set_toolbar_box(self, mode, toolbar_box):
+        if mode in self._toolbar_boxes:
+            self.__vboxes[mode].remove(self._toolbar_boxes.pop(mode))
+
+        if not toolbar_box:
+            return
+
+        self.__vboxes[mode].pack_start(toolbar_box, False)
+        self.__vboxes[mode].reorder_child(toolbar_box, 0)
+        self._toolbar_boxes[mode] = toolbar_box
+
+    @trace()
+    def get_tray(self, mode):
+        return self._trays.get(mode)
+
+    @trace()
+    def set_tray(self, mode, tray, position):
+        if mode in self._trays:
+            old_tray = self._trays.pop(mode)
+            box = old_tray.get_parent()
+            box.remove(old_tray)
+
+        if position == gtk.POS_LEFT:
+            self.__hboxes[mode].pack_start(tray, False)
+        elif position == gtk.POS_RIGHT:
+            self.__hboxes[mode].pack_end(tray, False)
+        elif position == gtk.POS_BOTTOM:
+            self.__vboxes[mode].pack_end(tray, False)
+
+        self._trays[mode] = tray
+
+    def add_alert(self, mode, alert):
+        self._alerts[mode].append(alert)
+        if len(self._alerts) > 1:
+            return
+
+        self.__vboxes[mode].pack_start(alert, False)
+        if mode in self._toolbar_boxes:
+            self.__vboxes[mode].reorder_child(alert, 1)
+        else:
+            self.__vboxes[mode].reorder_child(alert, 0)
+
+    def remove_alert(self, mode, alert):
+        if alert not in self._alerts[mode]:
+            return
+
+        self._alerts[mode].remove(alert)
+        if alert.get_parent() is None:
+            return
+
+        # the alert is the visible one on top of the queue
+        self.__vboxes[mode].remove(alert)
+        if not self._alerts[mode]:
+            return
+
+        self.__vboxes[mode].pack_start(self._alerts[mode][0], False)
+        if mode in self._toolbar_boxes:
+            self.__vboxes[mode].reorder_child(self._alerts[mode][0], 1)
+        else:
+            self.__vboxes[mode].reorder_child(self._alerts[mode][0], 0)
+
+    @trace()
+    def __window_realize_cb(self, window):
+        group = gtk.Window()
+        group.realize()
+        window.window.set_group(group.window)
+
+    def __key_press_cb(self, widget, event):
+        key = gtk.gdk.keyval_name(event.keyval)
+        if event.state & gtk.gdk.MOD1_MASK:
+            if self._current_mode in self._trays and key == 'space':
+                tray = self._trays[self._current_mode]
+                tray.props.visible = not tray.props.visible
+                return True
+
+        elif key == 'Escape' and self._is_fullscreen and \
+            self.props.enable_fullscreen_mode:
+            self.unfullscreen()
+            return True
+
+        return False
+
+    def __unfullscreen_button_pressed(self, widget, event):
+        self.unfullscreen()
+
+    def __motion_notify_cb(self, widget, event):
+        if self._is_fullscreen and self.props.enable_fullscreen_mode:
+            if not self._unfullscreen_button.props.visible:
+                self._unfullscreen_button.show()
+            else:
+                # Reset the timer
+                if self._unfullscreen_button_timeout_id is not None:
+                    gobject.source_remove(self._unfullscreen_button_timeout_id)
+                    self._unfullscreen_button_timeout_id = None
+
+                self._unfullscreen_button_timeout_id = \
+                    gobject.timeout_add_seconds( \
+                        _UNFULLSCREEN_BUTTON_VISIBILITY_TIMEOUT, \
+                        self.__unfullscreen_button_timeout_cb)
+        return False
+
+    def __unfullscreen_button_timeout_cb(self):
+        self._unfullscreen_button.hide()
+        self._unfullscreen_button_timeout_id = None
+        return False
+
+    def set_enable_fullscreen_mode(self, enable_fullscreen_mode):
+        self._enable_fullscreen_mode = enable_fullscreen_mode
+
+    def get_enable_fullscreen_mode(self):
+        return self._enable_fullscreen_mode
+
+    enable_fullscreen_mode = gobject.property(type=object,
+        setter=set_enable_fullscreen_mode, getter=get_enable_fullscreen_mode)
+
+    @trace()
+    def __configure_cb(self, widget_, event):
+        if self.child != self.__layout:
+            # work around a race condition on start-up
+            self.remove(self.__vboxes[self._current_mode])
+            self.__layout.add(self.__vboxes[self._current_mode])
+            self.add(self.__layout)
+
+        if self.__width == event.width and self.__height == event.height:
+            return
+
+        self.__width, self.__height = event.width, event.height
+        for vbox in self.__vboxes.values():
+            vbox.set_size_request(self.__width, self.__height)
+
+    @trace()
+    def __scroll_cb(self):
+        self.__scroll_step += 1
+
+        # skip frames if we're too slow
+        elapsed_time = time.time() - self.__scroll_start_time
+        acceptable_time_per_step = MultiModeWindow._SCROLL_INTERVAL_MS * 1.1
+        while elapsed_time > self.__scroll_step * acceptable_time_per_step \
+              and self.__scroll_step < MultiModeWindow._SCROLL_STEPS:
+            logging.debug('MultiModeWindow: Too slow, skipping frame!')
+            self.__scroll_step += 1
+
+        if self.__scroll_step >= MultiModeWindow._SCROLL_STEPS:
+            self._switch_mode_now()
+            return False
+
+        pixel_per_step = self.__width // MultiModeWindow._SCROLL_STEPS
+        scroll_pixels = self.__scroll_step * pixel_per_step
+        if self.__scroll_direction == 1:
+            self.__layout.move(self.__vboxes[self._current_mode],
+                               -scroll_pixels, 0)
+            self.__layout.move(self.__vboxes[self._next_mode],
+                               self.__width - scroll_pixels, 0)
+        else:
+            self.__layout.move(self.__vboxes[self._current_mode],
+                               scroll_pixels, 0)
+            self.__layout.move(self.__vboxes[self._next_mode],
+                               scroll_pixels - self.__width, 0)
+        return True
+
+    @trace()
+    def _switch_mode_now(self):
+        self.__layout.remove(self.__vboxes[self._current_mode])
+        self.__layout.move(self.__vboxes[self._next_mode], 0, 0)
+        self._current_mode = self._next_mode
+        self._next_mode = None
+
--
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