laydi/system/selections.py

from system import logger, dataset

import pygtk
import gtk
import gtk.gdk
import gtk.glade
import gnome
import gnome.ui
import gobject

class SimpleMenu(gtk.Menu):
    def __init__(self):
        gtk.Menu.__init__(self)
        
    def add_simple_item(self, title, function):
        item = gtk.MenuItem(title)
        item.connect('activate', function)
        self.append(item)
        item.show()


class DimListController:
    def __init__(self, dimlist, seltree, idlist):
        
        self._current_dim = None
        
        ## dimstore is a list of all dimensions in the application
        self.dimstore = gtk.ListStore(gobject.TYPE_STRING)

        ## Two types of lines, one for CategoryDatasets and one for
        ## Selections. The elements are title, link to dataset or selection
        ## and the name of the dimension.
        self.selstore = gtk.TreeStore(gobject.TYPE_STRING,
                                      gobject.TYPE_PYOBJECT,
                                      gobject.TYPE_STRING)
        self.selstore_filter = self.selstore.filter_new()
        self.selstore_filter.set_visible_func(self.dimension_filter)

        ## idstore is a list of currently selected identifiers
        ## the list is cleared and rebuilt each time a new selection is
        ## focused.
        self.idstore = gtk.ListStore(gobject.TYPE_STRING)
        
        ## The widgets we are controlling
        self.dimlist = dimlist
        self.seltree = seltree
        self.idlist = idlist

        ## Set up dimensions list
        dimlist.set_model(self.dimstore)
        
        renderer = gtk.CellRendererText()
        dim_column = gtk.TreeViewColumn('Dimension', renderer, text=0)
        dimlist.insert_column(dim_column, 0)

        dimlist.connect('row-activated', self._dim_row_activated)
        dimlist.connect('cursor-changed', self._dim_cursor_changed)

        ## Set up selection tree
        seltree.set_model(self.selstore_filter)

        renderer = gtk.CellRendererText()
        sel_column = gtk.TreeViewColumn('Selection', renderer, text=0)
        seltree.insert_column(sel_column, 0)

        seltree.connect('row-activated', self._sel_row_activated)
        seltree.connect('cursor-changed', self._sel_cursor_changed)

        seltree.drag_dest_set(gtk.DEST_DEFAULT_ALL,
                              [("GTK_TREE_MODEL_ROW", gtk.TARGET_SAME_APP, 7)],
                              gtk.gdk.ACTION_LINK)
        
        seltree.connect('drag-data-received', self._drag_data_received)

        ## Set up identifier list
        idlist.set_model(self.idstore)
        
        renderer = gtk.CellRendererText()
        dim_column = gtk.TreeViewColumn('Identifiers', renderer, text=0)
        idlist.insert_column(dim_column, 0)
        

    def get_dataset_iter(self, dataset):
        """Returns the iterator to the selection tree row containing a
        given dataset."""
        i = self.selstore.get_iter_first()
        while i:
            if self.selstore.get_value(i, 1) == dataset:
                return i
            i = self.selstore.iter_next(i)
        return None

    def get_current_selection_iter(self, selection, dimension):
        i = self.selstore.get_iter_first()
        while i:
            if self.selstore.get_value(i, 1) == selection:
                if self.selstore.get_value(i, 2) == dimension:
                    return i
            i = self.selstore.iter_next(i)
        return None
                
    def set_project(self, project):
        """Dependency injection."""
        self.project = project
        self.dim_names = project.dim_names
        self.update_dims()
        project.add_selection_observer(self)
        project.add_dataset_observer(self)

    def get_dimension(self, dim):
        """Returns the iterator to the dimension with the given name, or
        None if not found."""
        
        i = self.dimstore.get_iter_first()
        while i:
            if self.dimstore.get_value(i, 0) == dim:
                return i
            i = self.dimstore.iter_next(i)
        return None

    def dimension_filter(self, store, row):
        """Filters out everything but the selected dimension."""
        row_dim = store.get_value(row, 2)
        return row_dim == self._current_dim

    def update_dims(self):
        """Update the list of dimensions shown"""
        for dim in self.dim_names:
            if not self.get_dimension(dim):
                self.dimstore.insert_after(None, (dim,))

    def add_dataset(self, dataset):
        di = self.get_dataset_iter(dataset)
        if not di:
            values = (dataset.get_name(), dataset, dataset.get_dim_name(0))
            i = self.selstore.insert_after(None, None, values)
            for selection in dataset.as_selections():
                values = (selection.title, selection, dataset.get_dim_name(0))
                self.selstore.insert_after(i, None, values)

    def selection_changed(self, dim_name, selection):
        """Callback function from Project."""

        for dim in selection.dims():
            if not self.get_current_selection_iter(selection, dim):
                values = (selection.title, selection, dim)
                self.selstore.insert_after(None, None, values)

        self.update_dims()
        
    def dataset_changed(self):
        """Callback function from Project."""
        self.update_dims()

    ## GTK Callbacks.
    def _dim_cursor_changed(self, widget):
        cursor = self.dimlist.get_cursor()[0]
        i = self.dimstore.get_iter(cursor)
        row = self.dimstore.get_value(i, 0)
        self.set_dimension(row)

    def _dim_row_activated(self, widget, path, column):
        self.seltree.grab_focus()

    def _sel_cursor_changed(self, widget):
        "Show the list of identifier strings."
        p = self.seltree.get_cursor()[0]
        p = self.selstore_filter.convert_path_to_child_path(p)
        i = self.selstore.get_iter(p)
        obj = self.selstore.get_value(i, 1)

        id_list = []
        if isinstance(obj, dataset.Selection):
            id_list = list(obj[self._current_dim])
        id_list.sort()
        
        self.idstore.clear()
        for e in id_list:
            self.idstore.append((e,))

    def _sel_row_activated(self, widget, path, column):
        path = self.selstore_filter.convert_path_to_child_path(path)
        i = self.selstore.get_iter(path)
        obj = self.selstore.get_value(i, 1)
        if isinstance(obj, dataset.Dataset):
            seltree = self.seltree
            if seltree.row_expanded(path):
                seltree.collapse_row(path)
            else:
                seltree.expand_row(path, True)
        elif isinstance(obj, dataset.Selection):
            self.project.set_selection(self._current_dim,
                                       obj[self._current_dim])

    def set_dimension(self, dimname):
        self._current_dim = dimname
        self.selstore_filter.refilter()

        dim = self.get_dimension(self._current_dim)
        path = self.dimstore.get_path(dim)
        
        if self.dimlist.get_cursor()[0] != path:
            self.dimlist.set_cursor(self.dimstore.get_path(dim))

    def _drag_data_received(self, widget, drag_context, x, y,
                              selection, info, timestamp):

        treestore, path = selection.tree_get_row_drag_data()
        i = treestore.get_iter(path)
        obj = treestore.get_value(i, 2)
        if isinstance(obj, dataset.CategoryDataset):
            self.add_dataset(obj)
            self.set_dimension(obj.get_dim_name(0))
        widget.emit_stop_by_name('drag-data-received')