ruby-****@sourc*****
ruby-****@sourc*****
2012年 8月 21日 (火) 11:10:50 JST
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REMOTE_ADDR = 70.49.49.99
REMOTE_HOST =
URL = http://ruby-gnome2.sourceforge.jp/hiki.cgi?tut-gtk2-treev-trees
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@@ -227,6 +227,103 @@
== The((*set_cell_data_func()*))Helper Function
+############################################
+:((<Cell Data Functions|tut-treeview-renderer-celldatafunc>)) (From Matthew Berg's TreeView Tutorial):
+
+ A cell data function is a block of code that is called for a specific cell renderer for each single row before that row is rendered. It gives you maximum control over what exactly is going to be rendered, as you can set the cell renderer's properties just like you want to have them. Remember not only to set a property if you want it to be active, but also to unset a property if it should not be active (and it might have been set in the previous row).
+
+ Cell data functions are often used if you want more fine-grained control over what is to be displayed, or if the standard way to display something is not quite like you want it to be. A case in point are floating point numbers. If you want floating point numbers to be displayed in a certain way, say with only one digit after the colon/comma, then you need to use a cell data function. Use Gtk::TreeViewColumn#set_cell_data_func to set up a cell data function for a particular cell renderer.
+
+Here is an example:
+
+ liststore = Gtk::ListStore.new(String, Float)
+
+ renderer = Gtk::CellRendererText.new
+
+ col = Gtk::TreeViewColumn.new("Age", renderer)
+
+ col.set_cell_data_func(renderer) do |col, renderer, model, iter|
+ # display age with only one digit
+ renderer.text = sprintf("%.1f", iter[2])
+ # display cell in red if the age is below 18
+ if iter[2] < 18
+ renderer.background = "red"
+ else
+ renderer.background = nil
+ end
+ end
+
+Following is a simple example program demonstrating the use of ((*set_cell_data_func*)) function. Note that this function is associated with a particular cell renderer which is mapped to a tree view column via the column, associated with the renderer by Gtk::TreeViewColumn.new, and subsequently by the Gtk::TreeView#append_column(column) statement; so all ((*render, column,*)) which is associated with the ((*set_cell_data_func*)) function, and the ((*tree view*)) are all connected. The block associated with the ((*set_cell_data_func*)) function is executed for every row for that particular view column.
+
+
+ #!/usr/bin/env ruby
+ require 'gtk2'
+
+ # Add three columns to the GtkTreeView. All three of the
+ # columns will be displayed as text, although one is a boolean
+ # value and another is an integer.
+ def setup_tree_view(treeview)
+ # Create a new GtkCellRendererText, add it to the tree
+ # view column and append the column to the tree view.
+ renderer = Gtk::CellRendererText.new
+ column = Gtk::TreeViewColumn.new("Buy", renderer, :text => BUY_IT)
+ column.set_cell_data_func(renderer) do |col, renderer, model, iter|
+ renderer.background = iter[BUY_IT] ? "red" : nil
+ end
+ treeview.append_column(column)
+
+ renderer = Gtk::CellRendererText.new
+ column = Gtk::TreeViewColumn.new("Count", renderer, :text => QUANTITY)
+ treeview.append_column(column)
+
+ renderer = Gtk::CellRendererText.new
+ column = Gtk::TreeViewColumn.new("Product", renderer, :text => PRODUCT)
+ treeview.append_column(column)
+ end
+
+ class GroceryItem
+ attr_accessor :buy, :quantity, :product
+ def initialize(b, q, p); @buy, @quantity, @product = b, q, p; end
+ end
+ BUY_IT = 0; QUANTITY = 1; PRODUCT = 2
+
+ list = Array.new
+ list[0] = GroceryItem.new(true, 1, "Paper Towels")
+ list[1] = GroceryItem.new(true, 2, "Bread")
+ list[2] = GroceryItem.new(false, 1, "Butter")
+ list[3] = GroceryItem.new(true, 1, "Milk")
+ list[4] = GroceryItem.new(false, 3, "Chips")
+ list[5] = GroceryItem.new(true, 4, "Soda")
+
+ # Create a new tree model with three columns, as Boolean,
+ # integer and string.
+ store = Gtk::ListStore.new(TrueClass, Integer, String)
+ treeview = Gtk::TreeView.new(store) # Add the tree model (store) to the tree view
+ setup_tree_view(treeview)
+
+ # Add all of the products to the GtkListStore.
+ list.each_with_index do |e, i|
+ iter = store.append
+ store.set_value(iter, BUY_IT, list[i].buy) # iter[BUY_IT] = list[i].buy
+ store.set_value(iter, QUANTITY, list[i].quantity) # iter[QUANTITY] = list[i].quantity
+ store.set_value(iter, PRODUCT, list[i].product) # iter[PRODUCT] = list[i].product
+ end
+
+ scrolled_win = Gtk::ScrolledWindow.new
+ scrolled_win.add(treeview)
+ scrolled_win.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC)
+
+ window = Gtk::Window.new("Grocery List")
+ window.resizable = true
+ window.border_width = 10
+ window.signal_connect('destroy') { Gtk.main_quit }
+ window.set_size_request(250, 165)
+ window.add(scrolled_win)
+ window.show_all
+ Gtk.main
+
+
+###########
== Multidimensional Tree Store