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 Post subject: Sorting of Gtk treeView and Gtk button in the header
PostPosted: Sat May 03, 2014 10:33 pm 
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Joined: Sat May 03, 2014 4:05 pm
Posts: 1
Hello,

I am trying to learn Gtk-programming. Inspired by the Gnome Gtk tutorial I implemented a small File-browser using the Gtk treeView using python. I bumped now into two issues I still was not able to solve.

1. I implemented sorting of the items (files and directories) in the tree view. The sorting should be: directories first alphabetical sorted, then files alphabetical sorted. It works, but first after I click on column header. I would like to have the sorted order by the time the aplication starts. I would also like to prohibit, that the sorting order can be changed by clicking on the header. The sorting order should stay at 'ascending' , The 'descending' sorting order destroys my algorithm for succesive filling the filesystem structure.

2. I do not want to have any title in the header. Preferably I would like to dismiss the header completly. I discovered the possibility to place an widget inside the toolbar, so to use the space I placed a Gtk button inside. The button semmes not be responding on clicking.

I would be very pleased if someone could help me with those issues. I will also welcome if you could point me to any other Gtk related mistakes in my code.

Here is the code:

Code:
#!/usr/bin/python
import os, stat
from gi.repository import Gtk
from gi.repository.GdkPixbuf import Pixbuf

class MainWindow(Gtk.Window):

   def __init__(self):
      Gtk.Window.__init__(self, title="Simple Photo Importer", default_width = 400,default_height = 600)
        # initialize the filesystem treestore
      self.fileSystemTreeStore = Gtk.TreeStore(str, Pixbuf, str, bool)
      # populate the tree store
      self.populateFileSystemTreeStore(self.fileSystemTreeStore, '/home')
      # initialize the TreeView
      self.fileSystemTreeView = Gtk.TreeView(self.fileSystemTreeStore)
      # Create a TreeViewColumn
      treeViewCol = Gtk.TreeViewColumn(title=None)
      self.openDirButton = Gtk.Button(label="Open directory")
      self.openDirButton.connect("clicked", self.readNewDirectory)
      self.openDirButton.show()
      treeViewCol.set_widget(self.openDirButton)
      treeViewCol.set_clickable('false')# ???
      #setting coumn sort id
      treeViewCol.set_sort_column_id(0)# necessary
      #treeViewCol.set_sort_column_id(0, Gtk.SortType.ASCENDING)
      #treeViewCol.set_sort_order(Gtk.SortType.ASCENDING)
      self.fileSystemTreeStore.set_sort_func(0, self.compareFileListEntries, None)

      # Create a column cell to display text
      colCellText = Gtk.CellRendererText()
      # Create a column cell to display an image
      colCellImg = Gtk.CellRendererPixbuf()
      # Add the cells to the column
      treeViewCol.pack_start(colCellImg, False)
      treeViewCol.pack_start(colCellText, True)
      # Bind the text cell to column 0 of the tree's model
      treeViewCol.add_attribute(colCellText, "text", 0)
      # Bind the image cell to column 1 of the tree's model
      treeViewCol.add_attribute(colCellImg, "pixbuf", 1)
      # Append the columns to the TreeView
      self.fileSystemTreeView.append_column(treeViewCol)
      # add "on expand" callback
      self.fileSystemTreeView.connect("row-expanded", self.onRowExpanded)
      # add "on collapse" callback
      self.fileSystemTreeView.connect("row-collapsed", self.onRowCollapsed)
      self.scrollView = Gtk.ScrolledWindow()
      self.scrollView.add(self.fileSystemTreeView)
      # append the scrollView to the window (this)
      self.add(self.scrollView)

   def populateFileSystemTreeStore(self, treeStore, path, parent=None):
      itemCounter = 0
      # iterate over the items in the path
      for item in os.listdir(path):
         # Get the absolute path of the item
         itemFullname = os.path.join(path, item)
         # Extract metadata from the item
         itemMetaData = os.stat(itemFullname)
         # Determine if the item is a folder
         itemIsFolder = stat.S_ISDIR(itemMetaData.st_mode)
         # Generate an icon from the default icon theme
         itemIcon = Gtk.IconTheme.get_default().load_icon("folder" if itemIsFolder else "empty", 22, 0)
         # Append the item to the TreeStore
         currentIter = treeStore.append(parent, [item, itemIcon, itemFullname, itemIsFolder])
         # add dummy if current item was a folder
         if itemIsFolder: treeStore.append(currentIter, [None, None, None, 'true'])
         #increment the item counter
         itemCounter += 1
      # add the dummy node back if nothing was inserted before
      if itemCounter < 1: treeStore.append(parent, [None, None, None, 'true'])

   def onRowExpanded(self, treeView, treeIter, treePath):
      # get the associated model
      treeStore = treeView.get_model()
      # get the full path of the position
      newPath = treeStore.get_value(treeIter, 2)
      # populate the subtree on curent position
      self.populateFileSystemTreeStore(treeStore, newPath, treeIter)
      # remove the first child (dummy node)
      treeStore.remove(treeStore.iter_children(treeIter))

   def onRowCollapsed(self, treeView, treeIter, treePath):
      # get the associated model
      treeStore = treeView.get_model()
      # get the iterator of the first child
      currentChildIter = treeStore.iter_children(treeIter)
      # loop as long as some childern exist
      while currentChildIter:
         # remove the first child
         treeStore.remove(currentChildIter)
         # refresh the iterator of the next child
         currentChildIter = treeStore.iter_children(treeIter)
      # append dummy node
      treeStore.append(treeIter, [None, None, None, 'true'])

   def readNewDirectory(self, widget):
      print 'new dir'

   def compareFileListEntries(self, fileListModel, row1, row2, user_data):
      # name are stored in first column
      name1 = fileListModel.get_value(row1, 0)
      if name1: name1 = name1.lower()
      name2 = fileListModel.get_value(row2, 0)
      if name2: name2 = name2.lower()
      # is folder values are stored in fourth column
      isDir1 = fileListModel.get_value(row1, 3)
      isDir2 = fileListModel.get_value(row2, 3)
      # the comparator
      if isDir1 > isDir2:
         return -1
      elif isDir1 < isDir2:
         return 1
      else:
         if name1 < name2:
            return -1
         elif name1 > name2:
            return 1
         else:
            return 0


win = MainWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()


Thank you !


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