b2l-tools/lgi/samples/gtk-demo/demo-iconview-basics.lua

return function(parent, dir)

local lgi = require 'lgi'
local GLib = lgi.GLib
local GObject = lgi.GObject
local Gio = lgi.Gio
local Gtk = lgi.Gtk
local GdkPixbuf = lgi.GdkPixbuf

local assert = lgi.assert

local pixbuf = {
   REGULAR = assert(GdkPixbuf.Pixbuf.new_from_file(
		       dir:get_child('gnome-fs-regular.png'):get_path())),
   DIRECTORY = assert(GdkPixbuf.Pixbuf.new_from_file(
			 dir:get_child('gnome-fs-directory.png'):get_path())),
}

local ViewColumn = {
   PATH = 1,
   DISPLAY_NAME = 2,
   PIXBUF = 3,
   IS_DIRECTORY = 4,
}

local store = Gtk.ListStore.new {
   [ViewColumn.PATH] = Gio.File,
   [ViewColumn.DISPLAY_NAME] = GObject.Type.STRING,
   [ViewColumn.PIXBUF] = GdkPixbuf.Pixbuf,
   [ViewColumn.IS_DIRECTORY] = GObject.Type.BOOLEAN,
}
store:set_default_sort_func(
   function(model, a, b)
      -- Sort folders before files.
      a = model[a]
      b = model[b]
      local is_dir_a, is_dir_b =
	 a[ViewColumn.IS_DIRECTORY], b[ViewColumn.IS_DIRECTORY]
      if not is_dir_a and is_dir_b then
	 return 1
      elseif is_dir_a and not is_dir_b then
	 return -1
      else
	 return GLib.utf8_collate(a[ViewColumn.DISPLAY_NAME],
				  b[ViewColumn.DISPLAY_NAME])
      end
   end)
store:set_sort_column_id(Gtk.TreeSortable.DEFAULT_SORT_COLUMN_ID,
			 'ASCENDING')

local window = Gtk.Window {
   default_width = 650,
   default_height = 400,
   title = "Gtk.IconView demo",
   Gtk.Box {
      orientation = 'VERTICAL',
      Gtk.Toolbar {
	 Gtk.ToolButton {
	    id = 'up_button',
	    stock_id = Gtk.STOCK_GO_UP,
	    is_important = true,
	    sensitive = false,
	 },
	 Gtk.ToolButton {
	    id = 'home_button',
	    stock_id = Gtk.STOCK_HOME,
	    is_important = true,
	 },
      },
      Gtk.ScrolledWindow {
	 shadow_type = 'ETCHED_IN',
	 Gtk.IconView {
	    id = 'icon_view',
	    expand = true,
	    selection_mode = 'MULTIPLE',
	    model = store,
	    text_column = ViewColumn.DISPLAY_NAME - 1,
	    pixbuf_column = ViewColumn.PIXBUF - 1,
	    has_focus = true,
	 },
      },
   },
}

local current_dir = Gio.File.new_for_path('/')
local cancellable
local function fill_store()
   -- If the opertion is already running, just cancel it.  It will
   -- restart itself when cancel is detected.
   if cancellable then
      cancellable:cancel()
      return
   end

   -- Asynchronously started worker routine.
   local function fill()
      local function check(condition, err)
	 return not cancellable:is_cancelled() and assert(condition, err)
      end

      local dir = current_dir
      cancellable = Gio.Cancellable()
      Gio.Async.cancellable = cancellable
      store:clear()
      window.child.up_button.sensitive = (current_dir:get_parent() ~= nil)
      local enum = check(dir:async_enumerate_children('standard::*', 'NONE'))
      while not cancellable:is_cancelled() do
	 local infos = check(enum:async_next_files(16))
	 if not infos or #infos == 0 then break end
	 for _, info in pairs(infos) do
	    store:append {
	       [ViewColumn.PATH] = current_dir:get_child(info:get_name()),
	       [ViewColumn.DISPLAY_NAME] = info:get_display_name(),
	       [ViewColumn.IS_DIRECTORY] = info:get_file_type() == 'DIRECTORY',
	       [ViewColumn.PIXBUF] = pixbuf[info:get_file_type()],
	    }
	 end
      end

      -- Signalize that we are finished.
      cancellable = nil

      -- Check, whether someone else already requested different
      -- request.  If yes, spawn another query.
      if dir ~= current_dir then
	 Gio.Async.start(fill)()
      end
   end

   -- Perform actual fill asynchronously.
   Gio.Async.start(fill)()
end

-- Initial fill of the store.
fill_store()

function window.child.up_button:on_clicked()
   current_dir = current_dir:get_parent()
   fill_store()
end

function window.child.home_button:on_clicked()
   current_dir = Gio.File.new_for_path(GLib.get_home_dir())
   fill_store()
end

function window.child.icon_view:on_item_activated(path)
   local row = store[path]
   if row[ViewColumn.IS_DIRECTORY] then
      current_dir = row[ViewColumn.PATH]
      fill_store()
   end
end

function window:on_destroy()
   if cancellable then
      cancellable:cancel()
   end
end

window:show_all()
return window
end,

"Icon View/Icon View Basics",

table.concat {
   [[The Gtk.IconView widget is used to display and manipulate icons. ]],
   [[It uses a Gtk.TreeModel for data storage, so the list store example ]],
   [[might be helpful.]]
}