import os,sys
from itertools import izip
import pygtk
import gobject
import gtk
import fluents
from system import logger
import matplotlib
from matplotlib.backends.backend_gtkagg import FigureCanvasGTKAgg as FigureCanvas
from matplotlib.backend_bases import NavigationToolbar2,cursors
from matplotlib.backends.backend_gtk import FileChooserDialog,cursord
from matplotlib.widgets import SubplotTool,RectangleSelector
from matplotlib.axes import Subplot
from matplotlib.figure import Figure
from matplotlib import cm,cbook
from pylab import Polygon
from matplotlib.collections import LineCollection
from matplotlib.mlab import prctile
import networkx
import scipy
 
# global active mode. Used by toolbars to communicate correct mode
active_mode = 'default'

class ObjectTable:
    """A 2D table of elements."""

    def __init__(self, xsize=0, ysize=0, creator=None):
        self._elements = []
        self._creator = creator or (lambda : None)
        self.xsize = xsize
        self.ysize = ysize
        self.resize(xsize, ysize)

    def resize(self, xsize, ysize):
        """Resizes the table by removing and creating elements as required."""
        # Delete or append new rows
        del self._elements[ysize:]
        new_rows = ysize - len(self._elements)
        self._elements.extend([list() for i in range(new_rows)])

        # Delete or append new columns
        for row in self._elements:
            del row[xsize:]
            new_elems = xsize - len(row)
            row.extend([self._creator() for i in range(new_elems)])

    def __getitem__(self, index):
        x, y = index
        return self._elements[y][x]

    def __setitem__(self, index, value):
        x, y = index
        self._elements[y][x] = value


class ViewFrame (gtk.Frame):
    """
    A ViewFrame is a gtk bin that contains a view.
    The ViewFrame is either active or inactive, and belongs to a group of 
    VeiwFrames of which only one can be active at any time.
    """

    def __init__(self, view_frames):
        gtk.Frame.__init__(self)
        self.focused = False
        self.view_frames = view_frames
        self.empty_view = EmptyView()
        self._button_event = None
        
        view_frames.append(self)
        if len(view_frames) == 1:
            self.focus()
        else:
            self.focused = True
            self.unfocus()

        # Get dropped views
        self.drag_dest_set(gtk.DEST_DEFAULT_ALL,
                           [("GTK_TREE_MODEL_ROW", gtk.TARGET_SAME_APP, 7)],
                           gtk.gdk.ACTION_LINK)
        self.connect("drag-data-received", self.on_drag_data_received)
       
        # Set view
        self._view = self.empty_view
        self._view.connect("button-press-event", self.on_button_press_event)
        self.add(self._view)
        self._view.show()
        self.show()

    def focus(self):
        """Gets focus and ensures that no other window is in focus."""
        if self.focused:
            self.emit('focus-changed', self, True)
            return self

        for frame in self.view_frames:
            frame.unfocus()

        self.set_shadow_type(gtk.SHADOW_IN)
        self.focused = True
        self.emit('focus-changed', self, True)
        return self

    def unfocus(self):
        """Removes focus from the ViewFrame. Does nothing if unfocused."""
        if not self.focused:
            return

        self.set_shadow_type(gtk.SHADOW_OUT)
        self.focused = False
        self.emit('focus-changed', self, False)

    def set_view(self, view):
        """Set view to view or to empty view if parameter is None"""

        # if None is passed, use empty view
        if view == None:
            view = self.empty_view

        # do nothing if the view is already there
        if view == self._view:
            return
        
        # detach view from current parent
        view_parent = view.get_parent()
        if view_parent:
            view_parent.set_view(None)

        # switch which widget we are listening to
        if self._button_event:
            self._view.disconnect(self._button_event)

        self._button_event = view.connect("button-press-event", 
                                          self.on_button_press_event)

        # remove old view, set new view
        self._view.hide()
        self.remove(self._view)
        self.add(view)
        view.show()
        
        self._view = view

    def get_view(self):
        """Returns current view, or None if the empty view is set."""
        if self._view == self.empty_view:
            return None
        return self._view

    def on_button_press_event(self, widget, event):
        if not self.focused:
            self.focus()
            
    def on_drag_data_received(self, widget, drag_context, x, y, 
                              selection, info, timestamp):
        treestore, path = selection.tree_get_row_drag_data()
        iter = treestore.get_iter(path)
        obj  = treestore.get_value(iter, 2)

        if isinstance(obj, Plot):
            self.set_view(obj)
            self.focus()


class MainView (gtk.Notebook):
    def __init__(self):
        gtk.Notebook.__init__(self)
        self.set_show_tabs(False)
        self.set_show_border(False)

        self._view_frames = []
        self._views = ObjectTable(2, 2, lambda : ViewFrame(self._view_frames))
        self._small_views = gtk.Table(2, 2, True)
        self._small_views.set_col_spacings(4)
        self._small_views.set_row_spacings(4)
        self._large_view = ViewFrame(list())
        self.update_small_views()

        for vf in self._view_frames:
            vf.connect('focus-changed', self.on_view_focus_changed)
        
        self.append_page(self._small_views)
        self.append_page(self._large_view)
        self.show()
        self.set_current_page(0)

    def __getitem__(self, x, y):
        return self._views[x, y]

    def update_small_views(self):
        for x in range(self._views.xsize):
            for y in range(self._views.ysize):
                child = self._views[x,y]
                self._small_views.attach(child, x, x+1, y, y+1)

    def get_active_small_view(self):
        for vf in self._view_frames:
            if vf.focused:
                return vf
        return None
    
    def goto_large(self):
        if self.get_current_page() == 1:
            return

        vf = self.get_active_small_view()
        view = vf.get_view()
        vf.set_view(None)
        self._large_view.set_view(view)
        self.set_current_page(1)

    def goto_small(self):
        if self.get_current_page() == 0:
            return

        vf = self.get_active_small_view()
        view = self._large_view.get_view()
        self._large_view.set_view(None)
        vf.set_view(view)
        self.set_current_page(0)

    def insert_view(self, view):
        if self.get_current_page() == 0:
            vf = self.get_active_small_view()
        else:
            vf = self._large_view
        vf.set_view(view)
       
    def set_all_plots(self, plots):
        for vf in self._view_frames:
            if plots:
                vf.set_view(plots.pop())
            else:
                vf.set_view(None)

    def show(self):
        for vf in self._view_frames:
            vf.show()
        self._small_views.show()
        gtk.Notebook.show(self)
        
    def on_view_focus_changed(self, widget, vf, focused):
        if focused:
            self.emit('view-changed', vf)
    

class View (gtk.Frame):
    """The base class of everything that is shown in the center view of fluents.

    Most views should rather subclass Plot, which automatically handles freezing and
    toolbars, and sets up matplotlib Figure and Canvas objects.
    """
    
    def __init__(self, title):
        gtk.Frame.__init__(self)
        self.title = title
        self.set_shadow_type(gtk.SHADOW_NONE)

    def get_toolbar(self):
        return None


class EmptyView (View):
    """EmptyView is shown in ViewFrames that are unused."""
    def __init__(self):
        View.__init__(self, 'Empty view')
        label = gtk.Label('No view')
        ebox = gtk.EventBox()
        ebox.add(label)
        self.add(ebox)
        label.show()
        ebox.show()
        self.show()

    
class Plot (View):
    def __init__(self, title):
        View.__init__(self, title)
        
        self.selection_listener = None
        self.fig = Figure()
        self.canvas = FigureCanvas(self.fig)
        self._background = None
        self._frozen = False
        self._toolbar = PlotToolbar(self)
        self.canvas.add_events(gtk.gdk.ENTER_NOTIFY_MASK)
        self.current_dim = None

    def set_frozen(self, frozen):
        """A frozen plot will not be updated when the current selection is changed."""
        self._frozen = frozen
    
    def get_title(self):
        return self.title

    def selection_changed(self, dim_name, selection):
        """ Selection observer handle.
        
        A selection change in a plot is only drawn if:
        1.) plot is sensitive to selections (not freezed)
        2.) plot is visible (has a view)
        3.) the selections dim_name is the plot's dimension.
        """
        
        if not self._sel_sensitive \
               or not self.get_property('visible') \
               or self.current_dim != dim_name:
            print "Ignored a selection changed call in plot: %s" %self.get_title()
            return
        
        print "Setting current selection in: %s " %self.get_title()
        self.set_current_selection(selection)

    def set_selection_listener(self, listener):
        """Allow project to listen to selections.

        The selection will propagate back to all plots through the
        selection_changed() method. The listener will be called as
        listener(dimension_name, ids).
        """
        self.selection_listener = listener

        
class LineViewPlot(Plot):
    """Line view of current selection, no interaction
    Only works on 2d-arrays
    input:
           -- major_axis : dim_number for line dim (see scipy.ndarray for axis def.)
           -- minor_axis : needs definition only for higher order arrays
    ps: slow (cant get linecollection and blit to work)
    """
    def __init__(self, dataset, major_axis=1, minor_axis=None, name="Line view"):
        self.use_blit = False
        self._last_index = []
        self._data = dataset.asarray()
        self.dataset = dataset
        Plot.__init__(self, name)
        self.ax = self.fig.add_subplot(111)
        self.ax.set_title(self.get_title())
        self.current_dim = self.dataset.get_dim_name(major_axis)
        if len(self._data.shape)==2 and not minor_axis:
            minor_axis = major_axis-1

        #initial draw
        x_axis = scipy.arange(self._data.shape[minor_axis])
        self.line_segs=[]
        for xi in range(self._data.shape[major_axis]):
            yi = self._data.take([xi], major_axis)
            self.line_segs.append([(xx,yy) for xx,yy in izip(x_axis,yi)])

        #background
        xax = scipy.arange(self._data.shape[0])
        verts_0 = [] #100,0
        verts_1 = [] # 90,10
        verts_2 = [] # 75,25
        med = []
        for i in xax:
            pp = prctile(self._data[i,:], [0.,5.,25,50.,75.,95.,100])
            verts_0.append((i,pp[0]))
            verts_1.append((i,pp[1]))
            verts_2.append((i,pp[2]))
        for i in xax[::-1]:
            pp = prctile(self._data[i,:], [0.,5.,25,50.,75.,95.,100])
            verts_0.append((i, pp[-1]))
            verts_1.append((i, pp[-2]))
            verts_2.append((i, pp[-3]))
            med.append(pp[3])

        bck0 = Polygon(verts_0, alpha=.15, lw=0)
        bck1 = Polygon(verts_1, alpha=.15, lw=0)
        bck2 = Polygon(verts_2, alpha=.15, lw=0)
        
        self.ax.add_patch(bck0)
        self.ax.add_patch(bck1)
        self.ax.add_patch(bck2)
        self.ax.plot(xax,med, 'b')
        self.ax.autoscale_view()
        
        self.add(self.canvas)
        self.canvas.show()
        
        #FIXME: Lineview plot cannot do selections -> disable in toolbar
        self._toolbar = PlotToolbar(self)
        self.canvas.mpl_connect('resize_event', self.clear_background)


    def get_toolbar(self):
        return self._toolbar
        
    def clear_background(self, event):
        self._background = None
        
    def set_current_selection(self, selection):
        ids = selection[self.current_dim] # current identifiers
        index = self.dataset.get_indices(self.current_dim, ids)
        if self.use_blit:
            if self._background is None:
                self._bbox = self.ax.bbox.deepcopy()
                self._background = self.canvas.copy_from_bbox(self.ax.bbox)
            self.canvas.restore_region(self._background)

        if len(index)>0: # do we have a selection
            if len(self.ax.collections)>0:
                self.ax.collections = []
            segs = [self.line_segs[i] for i in index]
            line_coll = LineCollection(segs, colors=(1,0,0,1))
            line_coll.set_clip_box(self.ax.bbox)
            self.ax.update_datalim(line_coll.get_verts(self.ax.transData))
            self._toolbar.forward()
            if self.use_blit:
                self.ax.draw_artist(line_coll)
                #print "\nLine collection clip box:"
                line_coll.get_clip_box().get_bounds()
                #print "\nLine collection bbox:"
                #print self.ax.bbox.get_bounds()
                #print "Background bbox:"
                #print self._bbox.get_bounds()
                #self.canvas.blit(self._bbox)
                self.canvas.blit()
                
                #self.ax.draw_artist(line_coll)
            else:
                self.ax.add_collection(line_coll)
                self.canvas.draw()
            
class ScatterMarkerPlot(Plot):
    """The ScatterMarkerPlot is faster than regular scatterplot, but
has no color and size options."""
    def __init__(self, dataset_1, dataset_2, id_dim, sel_dim, id_1, id_2,s=6, name="Scatter plot"):
        Plot.__init__(self, name)
        self.use_blit = False
        self._background = None
        self.ax = self.fig.add_subplot(111)
        self.ax.axhline(0, color='k', lw=1., zorder=1)
        self.ax.axvline(0, color='k', lw=1., zorder=1)
        self.current_dim = id_dim
        self.dataset_1 = dataset_1
        self.ms = s
        self._selection_line = None
        x_index = dataset_1[sel_dim][id_1]
        y_index = dataset_2[sel_dim][id_2]
        self.xaxis_data = dataset_1._array[:, x_index]
        self.yaxis_data = dataset_2._array[:, y_index]
        self.ax.plot(self.xaxis_data, self.yaxis_data, 'o', markeredgewidth=0, markersize=s)
        self.ax.set_title(self.get_title())
        self.add(self.canvas)
        self.canvas.show()

    def get_toolbar(self):
        return self._toolbar

    def rectangle_select_callback(self, x1, y1, x2, y2):
        print "Rectangle select happened in: %s" %self.get_title()
        ydata = self.yaxis_data
        xdata = self.xaxis_data

        # find indices of selected area
        if x1>x2:
            x1, x2 = x2, x1
        if y1>y2:
            y1, y2 = y2, y1
        assert x1<=x2
        assert y1<=y2
        index = scipy.nonzero((xdata>x1) & (xdata<x2) & (ydata>y1) & (ydata<y2))[0]
        ids = self.dataset_1.get_identifiers(self.current_dim, index)
        self.selection_listener(self.current_dim, ids)

    def set_current_selection(self, selection):
        ids = selection[self.current_dim] # current identifiers
        index = self.dataset_1.get_indices(self.current_dim, ids)
        if self.use_blit:
            if self._background is None:
                self._background = self.canvas.copy_from_bbox(self.ax.bbox)
            self.canvas.restore_region(self._background)
        if not len(index)>0:
            return
        xdata_new = self.xaxis_data.take(index) #take data
        ydata_new = self.yaxis_data.take(index)
        #remove old selection
        if self._selection_line:
            self.ax.lines.remove(self._selection_line)

        self._selection_line, = self.ax.plot(xdata_new, ydata_new,marker='o', markersize=self.ms, linestyle=None, markerfacecolor='r')

        self._toolbar.forward() #update data lims before draw
        if self.use_blit:
            self.ax.draw_artist(self._selection_line)
            self.canvas.blit()
        else:
            print "A draw happened in: %s" %self.get_title()
            self.canvas.draw()


class ScatterPlot(Plot):
    """The ScatterPlot is slower than scattermarker, but has size option."""
    def __init__(self, dataset_1, dataset_2, id_dim, sel_dim, id_1, id_2,c='b',s=30,sel_dim_2=None, name="Scatter plot"):
        Plot.__init__(self, name)
        self.use_blit = False
        self.ax = self.fig.add_subplot(111)
        self.current_dim = id_dim
        self.dataset_1 = dataset_1
        x_index = dataset_1[sel_dim][id_1]
        if sel_dim_2:
            y_index = dataset_2[sel_dim_2][id_2]
        else:
            y_index = dataset_2[sel_dim][id_2]
        self.xaxis_data = dataset_1._array[:, x_index]
        self.yaxis_data = dataset_2._array[:, y_index]
        lw = scipy.zeros(self.xaxis_data.shape)
        sc = self.ax.scatter(self.xaxis_data, self.yaxis_data, s=s, c=c, linewidth=lw, edgecolor='k', alpha=.6, cmap = cm.jet)
        if len(c)>1:
            self.fig.colorbar(sc,ticks=[], fraction=.05)
        self.ax.axhline(0, color='k', lw=1., zorder=1)
        self.ax.axvline(0, color='k', lw=1., zorder=1)
        self.ax.set_title(self.get_title())
        # collection
        self.coll = self.ax.collections[0]

        # add canvas to widget
        self.add(self.canvas)
        self.canvas.show()

    def get_toolbar(self):
        return self._toolbar

    def rectangle_select_callback(self, x1, y1, x2, y2):
        print "Rectangle select happened in: %s" %self.get_title()
        ydata = self.yaxis_data
        xdata = self.xaxis_data

        # find indices of selected area
        if x1>x2:
            x1, x2 = x2, x1
        if y1>y2:
            y1, y2 = y2, y1
        assert x1<=x2
        assert y1<=y2

        index = scipy.nonzero((xdata>x1) & (xdata<x2) & (ydata>y1) & (ydata<y2))[0]
        ids = self.dataset_1.get_identifiers(self.current_dim, index)
        self.selection_listener(self.current_dim, ids)

    def set_current_selection(self, selection):
        ids = selection[self.current_dim] # current identifiers
        if len(ids)==0:
            print "nothing selected"
            return
        self._toolbar.forward() #update data lims before draw
        index = self.dataset_1.get_indices(self.current_dim, ids)
        if self.use_blit:
            if self._background is None:
                self._background = self.canvas.copy_from_bbox(self.ax.bbox)
            self.canvas.restore_region(self._background)
        lw = scipy.zeros(self.xaxis_data.shape)
        if len(index)>0:
            lw.put(2.,index)
        self.coll.set_linewidth(lw)
        
        if self.use_blit:
            print "A blit happened in : %s " %self.get_title()
            self.canvas.blit()
            self.ax.draw_artist(self.coll)
        else:
            print "A draw happened in : %s " %self.get_title()
            self.canvas.draw()
        
        
class NetworkPlot(Plot):
    def __init__(self, dataset, **kw):
        # Set member variables and call superclass' constructor
        self.graph = dataset.asnetworkx()
        self.dataset = dataset 
        self.keywords = kw
        self.dim_name = self.dataset.get_dim_name(0)
        self.current_dim = self.dim_name
        if not kw.has_key('name'):
            kw['name'] = self.dataset.get_name()
        if not kw.has_key('prog'):
            kw['prog'] = 'neato'
        if not kw.has_key('pos') or kw['pos']:
            kw['pos'] = networkx.pygraphviz_layout(self.graph, kw['prog'])
        Plot.__init__(self, kw['name'])

        # Keep node size and color as dicts for fast lookup
        self.node_size = {}
        if kw.has_key('node_size') and cb.iterable(kw['node_size']):
            kw.remove('node_size')
            for id, size in zip(self.dataset[self.dim_name], kw['node_size']):
                self.node_size[id] = size
        else:
            for id in dataset[self.dim_name]:
                self.node_size[id] = 40
                
        self.node_color = {}
        if kw.has_key('node_color') and cb.iterable(kw['node_color']):
            kw.remove('node_color')
            for id, color in zip(self.dataset[self.dim_name], kw['node_color']):
                self.node_color[id] = color
        else:
            self.node_color = None
#            for id in self.dataset[self.dim_name]:
#                self.node_color[id] = 'red'

        if kw.has_key('node_color'):
            kw.pop('node_color')

        self.ax = self.fig.add_subplot(111)
        self.ax.set_position([0.01,0.01,.99,.99])
        self.ax.set_xticks([])
        self.ax.set_yticks([])
        # FIXME: ax shouldn't be in kw at all
        if kw.has_key('ax'):
            kw.pop('ax')

        # Add canvas and show
        self.add(self.canvas)
        self.canvas.show()

        # Initial draw
        networkx.draw_networkx(self.graph, ax=self.ax, **kw)

    def get_toolbar(self):
        return self._toolbar

    def rectangle_select_callback(self, x1, y1, x2, y2):
        pos = self.keywords['pos']
        ydata = scipy.zeros((len(pos),), 'l')
        xdata = scipy.zeros((len(pos),), 'l')
        node_ids = []
        c = 0
        for name,(x,y) in pos.items():
            node_ids.append(name)
            xdata[c] = x
            ydata[c] = y
            c+=1
        
        # find indices of selected area
        if x1 > x2:
            x1, x2 = x2, x1
        if y1 > y2:
            y1, y2 = y2, y1
        index = scipy.nonzero((xdata>x1) & (xdata<x2) & (ydata>y1) & (ydata<y2))[0]
        

        ids = [node_ids[i] for i in index]
        self.selection_listener(self.current_dim, ids)

    def set_current_selection(self, selection):
        ids = selection[self.current_dim] # current identifiers
        node_set = set(self.graph.nodes())

        selected_nodes = list(ids.intersection(node_set))
        unselected_nodes = list(node_set.difference(ids))

        if self.node_color:
            unselected_colors = [self.node_color[x] for x in unselected_nodes]
        else:
            unselected_colors = 'red'

        if self.node_size:
            unselected_sizes = [self.node_size[x] for x in unselected_nodes]
            selected_sizes = [self.node_size[x] for x in selected_nodes]

        self.ax.clear()
        networkx.draw_networkx_edges(self.graph, edge_list=self.graph.edges(), \
            ax=self.ax, **self.keywords)
        networkx.draw_networkx_labels(self.graph,**self.keywords)
        if unselected_nodes:
            networkx.draw_networkx_nodes(self.graph, nodelist=unselected_nodes, \
                node_color='r', node_size=unselected_sizes, ax=self.ax, **self.keywords)

        if selected_nodes:
            networkx.draw_networkx_nodes(self.graph, nodelist=selected_nodes, \
             node_color='k', node_size=selected_sizes, ax=self.ax, **self.keywords)
        
        self.canvas.draw()


class PlotMode:
    """A PlotMode object corresponds to a mouse mode in a plot.

    When a mode is selected in the toolbar, the PlotMode corresponding
    to the toolbar button is activated by calling setup(ax) for the axis
    system ax.
    """
    def __init__(self, name, tooltip, image_file):
        self.name = name
        self.tooltip = tooltip
        self.image_file = image_file

    def get_icon(self):
        """Returns the icon for the PlotMode"""
        fname = os.path.join(fluents.ICONDIR, self.image_file)
        image = gtk.Image()
        image.set_from_file(fname)
        return image
        
    def activate(self, canvas):
        pass

    def deactivate(self):
        pass


class DefaultPlotMode (PlotMode):
    def __init__(self):
        PlotMode.__init__(self, 'default', 'Default mode', 'cursor.png')


class PanPlotMode (PlotMode):
    def __init__(self):
        PlotMode.__init__(self, 'pan',
                          'Pan axes with left mouse, zoom with right',
                          'move.png')
        self._button_press = None
        self._button_release = None

    def activate(self, canvas):
        self._button_press = self.canvas.mpl_connect(
            'button_press_event', self._on_button_press)
        self._button_relese = self.canvas.mpl_connect(
            'button_release_event', self._on_button_release)
        self.mode = 'pan/zoom mode'

    def deactivate(self):
        if self._button_press:
            self.canvas.mpl_disconnect(self._button_press)

        if self._button_release:
            self.canvas.mpl_disconnect(self._button_release)


class ZoomPlotMode (PlotMode):
    def __init__(self):
        PlotMode.__init__(self, 'zoom',
                          'Zoom to rectangle','zoom_to_rect.png')        

    def activate(self, canvas):
        self._button_press = self.canvas.mpl_connect(
            'button_press_event', self._on_button_press)
        self._button_relese = self.canvas.mpl_connect(
            'button_release_event', self._on_button_release)
        self.mode = 'pan/zoom mode'

    def deactivate(self):
        if self._button_press:
            self.canvas.mpl_disconnect(self._button_press)

        if self._button_release:
            self.canvas.mpl_disconnect(self._button_release)


class SelectPlotMode (PlotMode):
    def __init__(self):
        PlotMode.__init__(self, 'select',
                          'Select within rectangle', 'select.png')
        self._selectors = []


    def activate(self, canvas):
        for ax in canvas.figure.get_axes():
            props = dict(facecolor='blue', edgecolor = 'black',
                         alpha=0.3, fill=True)

            rs = RectangleSelector(ax, self.on_select, drawtype='box',
                                   useblit=True, rectprops = props)
            self._selectors.append(rs)

    def deactivate(self):
        for sel in self.selectors:
            self.canvas.mpl_disconnect(sel.onmove)
            self.canvas.mpl_disconnect(sel.press)
            self.canvas.mpl_disconnect(sel.release)
            self.canvas.mpl_disconnect(sel.update_background)


class PlotToolbar(gtk.Toolbar):
    
    def __init__(self, plot):
        gtk.Toolbar.__init__(self)
        self.plot = plot
        self.canvas = plot.canvas
        self._current_mode = None
        self.tooltips = gtk.Tooltips()

        ## Maps toolbar buttons to PlotMode objects.
        self._mode_buttons = {}

        self.set_property('show-arrow', False)
        
        #canvas.connect('enter-notify-event', self.on_enter_notify)
        self.show()
        self.add_mode(DefaultPlotMode())
        self.add_mode(PanPlotMode())
        self.add_mode(ZoomPlotMode())
        self.add_mode(SelectPlotMode())
        self.show_all()

    def add_mode(self, mode):
        """Adds a new mode to the toolbar."""

        if len(self._mode_buttons) > 0:
            other = self._mode_buttons.keys()[0]
        else:
            other = None

        btn = gtk.RadioToolButton(other)
        btn.set_icon_widget(mode.get_icon())
        btn.set_tooltip(self.tooltips, mode.tooltip, 'Private')
        btn.connect('toggled', self._on_mode_toggle)

        self._mode_buttons[btn] = mode
        self.insert(btn, -1)

        if self._current_mode == None:
            self._current_mode = mode

    def get_mode(self):
        """Returns the active mode name."""
        if self._current_mode:
            return self._current_mode.name
        return None
    
    def get_mode_by_name(self, mode_name):
        """Returns the mode with the given name or None."""
        for m in self._mode_buttons.values():
            if m.name == mode_name:
                return m
        return None

    def get_button(self, mode_name):
        """Returns the button that corresponds to a mode name."""
        for b, m in self._mode_buttons.items():
            if m == mode_name:
                return b
        return None
    
    def set_mode(self, mode_name):
        """Sets a mode by name. Returns the mode or None"""
        if mode_name == self._current_mode.name:
            return None

        if self._current_mode:
            self._current_mode.deactivate()

        new_mode = self.get_mode_by_name(mode_name)
        if new_mode:
            new_mode.activate(self.canvas)
            self._current_mode = self.get_mode_by_name(mode_name)
        else:
            logger.log('warning', 'No such mode: %s' % mode_name)
            
        return self._current_mode

    def _on_mode_toggle(self, button):
        if button.get_active():
            self.set_mode(self._mode_buttons[button].name)

#     def show(self):
#         for b in self._mode_buttons.keys():
#             b.show()
#         gtk.Toolbar.show(self)
        
# class PlotToolbar(NavigationToolbar2,gtk.Toolbar):
#     # list of toolitems to add to the toolbar, format is:
#     # text, tooltip_text, image_file, callback(str)
#     toolitems = (
#         ('Home', 'Reset original view', 'home.png', 'home'),
#         #('Back', 'Back to  previous view','back.png', 'back'),
#         #('Forward', 'Forward to next view','forward.png', 'forward'),
#         #('Subplots', 'Configure subplots','subplots.png', 'configure_subplots'),
#         ('Save', 'Save the figure','filesave.png', 'save_figure'),
#         )

#     def __init__(self, canvas, plot):
#         self.win = None
#         self.plot = plot
#         gtk.Toolbar.__init__(self)
#         NavigationToolbar2.__init__(self, canvas)
#         self._idleId = 0
#         self._select_callback = None
#         canvas.connect('enter-notify-event', self.on_enter_notify)
        
#     def _init_toolbar(self):
#         self.set_style(gtk.TOOLBAR_ICONS)
#         self.tooltips = gtk.Tooltips()
#         self._modes = {}
#         self._selector = None
#         self.set_property('show-arrow', False)
#         basedir = fluents.ICONDIR

#         # setup base buttons
#         for text, tooltip_text, image_file, callback in self.toolitems:
#             if text is None:
#                 self.insert(gtk.SeparatorToolItem(), -1 )
#                 continue
#             fname = os.path.join(basedir, image_file)
#             image = gtk.Image()
#             image.set_from_file(fname)
#             tbutton = gtk.ToolButton(image, text)
#             self.insert(tbutton, -1)
#             tbutton.connect('clicked', getattr(self, callback))
#             tbutton.set_tooltip(self.tooltips, tooltip_text, 'Private')

#         self.insert(gtk.SeparatorToolItem(), -1)

#         # mode/state buttons 
#         rbutton = None
#         for text,tooltip_text,image_file,callback in self.radiobuttons:
#             if text is None:
#                 self.insert(gtk.SeparatorToolItem(), -1 )
#                 continue
#             fname = os.path.join(basedir, image_file)
#             image = gtk.Image()
#             image.set_from_file(fname)
#             rbutton = gtk.RadioToolButton(rbutton)
#             rbutton.set_icon_widget(image)
#             rbutton.connect('toggled', getattr(self, callback))
#             rbutton.set_tooltip(self.tooltips, tooltip_text, 'Private')
#             self._modes[text] = rbutton
# a            self.insert(rbutton, -1)

#         self.insert(gtk.SeparatorToolItem(), -1)
        
#         toolitem = gtk.ToolItem()
#         self.insert(toolitem, -1)
#         self.message = gtk.Label()
#         toolitem.add(self.message)

#         self.tb_freeze = gtk.ToolItem()
#         self.chk = gtk.CheckButton ()
#         self.chk.set_label ('Freeze')
#         self.tb_freeze.add (self.chk)
#         self.tb_freeze.set_tooltip(self.tooltips, 'Freeze current selection')
#         self.insert(self.tb_freeze,-1)        
        
#         toolitem = gtk.SeparatorToolItem()
#         self.insert(toolitem, -1)

#         self.show_all()

#         self.fileselect = FileChooserDialog(title='Save the figure', parent=self.win,)
    

#     def on_enter_notify(self, widget, event):
#         if self._active != active_mode:
#             self.set_mode(active_mode)
#         self.set_mode(active_mode)

#     def set_mode(self, mode):
#         ## Do nothing if this mode is already active
#         if self.mode == mode:
#             print "set_mode: already in mode '%s': returning" % mode
#             return mode

#         ## Remove current Selector if set.
#         if self._selector != None:
#             self.canvas.mpl_disconnect(self._selector.onmove)
#             self.canvas.mpl_disconnect(self._selector.press)
#             self.canvas.mpl_disconnect(self._selector.release)
#             self.canvas.mpl_disconnect(self._selector.update_background)
#             print "set_mode: Removing selector in: %s" %self.plot.get_title()
#             self._selector = None

#         ## Remove current mouse button bindings
#         if self._idPress != None:
#             self._idPress = self.canvas.mpl_disconnect(self._idPress)
#             self.mode = ''

#         if self._idRelease != None:
#             self._idRelease = self.canvas.mpl_disconnect(self._idRelease)
#             self.mode = ''

#         ## Set state, and do state initialization
#         self.mode = mode
        
            
#     def set_mode(self, active):
#         print "Set mode called in toolbar from: %s" %self.plot.get_title()
#         # if state is unkown or not set, set to default
#         if active == None or active not in self._modes.keys():
#             active = 'DEFAULT'

#         # remove current Selector:
#         if self._selector != None:
#             # problem is ... i have mutliple selectors still connected
#             # trying to remove old selectors connections
#             #
#             # blah
#             # Her Einar ...
#             #
#             self.canvas.mpl_disconnect(self._selector.onmove)
#             self.canvas.mpl_disconnect(self._selector.press)
#             self.canvas.mpl_disconnect(self._selector.release)
#             self.canvas.mpl_disconnect(self._selector.update_background)
#             print "Removing selector in: %s" %self.plot.get_title()
#             self._selector = None
        
#         # remove current button bindings
#         if self._idPress != None:
#             self._idPress = self.canvas.mpl_disconnect(self._idPress)
#             self.mode = ''

#         if self._idRelease != None:
#             self._idRelease = self.canvas.mpl_disconnect(self._idRelease)
#             self.mode = ''

#         self._modes[active]
        
#         for state, button in self._modes.items():
#             if state != active:
#                 continue
            
#             if state == 'SELECT':
#                 for ax in self.canvas.figure.get_axes():
#                     props = dict(facecolor='blue', edgecolor = 'black',
#                                  alpha=0.3, fill=True)
#                     print "creating a selector"
#                     self._selector = RectangleSelector(ax, self.on_select,
#                                                        drawtype='box', useblit=True,
#                                                        rectprops=props)
#                     self.mode = 'Select rectangle mode'
                
#             elif state == 'PAN':
#                 self._idPress = self.canvas.mpl_connect(
#                     'button_press_event', self.press_pan)
#                 self._idRelease = self.canvas.mpl_connect(
#                     'button_release_event', self.release_pan)
#                 self.mode = 'pan/zoom mode'

#             elif state == 'ZOOM':
#                 self._idPress = self.canvas.mpl_connect('button_press_event', self.press_zoom)
#                 self._idRelease = self.canvas.mpl_connect('button_release_event', self.release_zoom)
#                 self.mode = 'Zoom to rect mode'

#             elif state == 'DEFAULT':
#                 pass
#             else:
#                 pass
            
#             if not button.get_active():
#                 button.set_active(True)
                
#         for a in self.canvas.figure.get_axes():
#             a.set_navigate_mode(self._active)     

#         self.set_message(self.mode)

#         self._active = active
#         # update global active_mode (for all toolbar)
#         globals()['active_mode'] = active
        
#     def get_mode(self):
#         if self._active == None:
#             return 'DEFAULT'
#         return self._active

#     def default(self, button):
#         """Activates default mode"""
#         if not button.get_active():
#             return
#         self.set_mode('DEFAULT')
        
#     def select(self, button):
#         """Activate select mode"""
#         if not button.get_active():
#             return
#         self.set_mode('SELECT')

#     def on_select(self, eclick, erelease, selector):
#           'eclick and erelease are matplotlib events at press and release'
#           if self._select_callback:
#               print "Onselect called:"
#               print "    %s" % selector
#               self._select_callback(eclick.xdata, eclick.ydata, erelease.xdata, erelease.ydata)
        
#     def pan(self, button):
#         """Activate the pan/zoom tool. pan with left button, zoom with right"""
#         if not button.get_active():
#             return
#         self.set_mode('PAN')
        
#     def zoom(self, button):
#         """Activate zoom to rect mode"""
#         if not button.get_active():
#             return
#         self.set_mode('ZOOM')
        
#     def mouse_move(self, event):
#         """Extend NavigationToolbar2.mouse_move to provide selection support."""
#         # Only update the rubberband for selection mode when mouse is
#         # within the plotting area.
        
#         #if event.inaxes and self._active=='SELECT':
#         #    if self._lastCursor != cursors.SELECT_REGION:
#         #        self.set_cursor(cursors.SELECT_REGION)
#         #        self._lastCursor = cursors.SELECT_REGION
#         #    if self._xypress is not None:
#         #        x, y = event.x, event.y
#         #        lastx, lasty, a, ind, lim, trans= self._xypress
#         #        self.draw_rubberband(event, x, y, lastx, lasty)

#         NavigationToolbar2.mouse_move(self, event)
        
#     def set_select_callback(self, listener):
#         """Allow plots to register a callback for selection events.

#         The callback will be called as listener(x1, y1, x2, y2).  All
#         coordinates are in the plot coordinate system, not pixels or
#         widget coordinates.
#         """
#         self._select_callback = listener

#     def set_cursor(self, cursor):
#         self.canvas.window.set_cursor(cursord[cursor])

#     def dynamic_update(self):
#         # legacy method; new method is canvas.draw_idle
#         self.canvas.draw_idle()
        

#     def save_figure(self, button):
#         fname = self.fileselect.get_filename_from_user()
#         if fname:
#             self.canvas.print_figure(fname)

#     def configure_subplots(self, button):
#         toolfig = Figure(figsize=(6,3))
#         canvas = self._get_canvas(toolfig)
#         toolfig.subplots_adjust(top=0.9)
#         tool =  SubplotTool(self.canvas.figure, toolfig)

#         w = int (toolfig.bbox.width())
#         h = int (toolfig.bbox.height())


#         window = gtk.Window()
#         window.set_title("Subplot Configuration Tool")
#         window.set_default_size(w, h)
#         vbox = gtk.VBox()
#         window.add(vbox)
#         vbox.show()

#         canvas.show()
#         vbox.pack_start(canvas, True, True)
#         window.show()

#     def _get_canvas(self, fig):
#         return FigureCanvas(fig)
    

# Create a view-changed signal that should be emitted every time
# the active view changes.
gobject.signal_new('view-changed', MainView, gobject.SIGNAL_RUN_LAST,
                   gobject.TYPE_NONE, 
                   (gobject.TYPE_PYOBJECT,))

# Create focus-changed signal
gobject.signal_new('focus-changed', ViewFrame, gobject.SIGNAL_RUN_LAST,
                   gobject.TYPE_NONE, 
                   (gobject.TYPE_PYOBJECT, gobject.TYPE_BOOLEAN,))