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-- Copyright 2000 Richie Bielak and others
-- Licensed under Eiffel Forum Freeware License, version 1;
-- (see forum.txt)
--
class CREATE_TREE_CMD
inherit
GTK_COMMAND
GTK_SELECTIONMODE_ENUM
GTK_CONSTANTS
creation
make
feature
tree_parameters: TREE_CMD
-- this object contains references to all the widgets
-- that specify tree creation parameters
make (tree_parms: TREE_CMD) is
require
not_void: tree_parms /= Void
do
tree_parameters := tree_parms
end
execute is
local
selection_mode,
nb_item,
recursion_level: INTEGER
view_line, draw_line, no_root_item: BOOLEAN
do
-- get selection mode
if tree_parameters.single_button.button_is_down then
selection_mode := Gtk_selection_single
elseif tree_parameters.browse_button.button_is_down then
selection_mode := Gtk_selection_browse
else
selection_mode := Gtk_selection_multiple
end
-- get options choice
draw_line := tree_parameters.draw_line_button.button_is_down
view_line := tree_parameters.view_line_button.button_is_down
no_root_item := tree_parameters.no_root_item_button.button_is_down
-- get levels
nb_item := tree_parameters.nb_of_item_spinner.value_as_integer
recursion_level := tree_parameters.recursion_spinner.value_as_integer
if recursion_level > 100 then
print ("Recursion level too large, try something less. %N")
else
create_tree (selection_mode, draw_line, view_line, no_root_item,
nb_item, recursion_level)
end
end
feature -- tree window widgets
window: GTK_WINDOW
root_tree: GTK_TREE
add_button,
remove_button,
subtree_button: GTK_BUTTON
feature -- callbacks
tree_changed: TREE_CHANGED_CMD
add_cmd: TREE_ADD_ITEM_CMD
remove_cmd: TREE_REMOVE_ITEMS_CMD
remove_subtree_cmd: TREE_REMOVE_SUBTREE_CMD
feature -- creation of tree
create_tree (selection_mode: INTEGER;
draw_line, view_line, no_root_item: BOOLEAN;
nb_item_max, recursion_level_max: INTEGER) is
local
box1, box2: GTK_BOX
scrolled_win: GTK_SCROLLED_WINDOW
button: GTK_BUTTON
close_cmd: CLOSE_WINDOW_COMMAND
separator: GTK_SEPARATOR
root_item: GTK_TREE_ITEM
do
-- create a top level window
!!window.make_top_level
window.set_title ("Tree Sample")
!!box1.make_vertical (False, 0)
window.add_widget (box1)
-- create a tree box
!!box2.make_vertical (False, 0)
box1.pack (box2, True, True, 0)
box2.set_border_width (5)
-- create a scrolled window
!!scrolled_win.make
scrolled_win.set_policy (Gtk_policy_automatic, Gtk_policy_automatic)
box2.pack (scrolled_win, True, True, 0)
scrolled_win.set_size (200, 200)
-- create a tree widget
!!root_tree.make
!!tree_changed.make (Current)
root_tree.add_action ("selection_changed", tree_changed)
scrolled_win.add_widget_with_viewport (root_tree)
root_tree.set_selection_mode (selection_mode)
if draw_line then
root_tree.set_view_lines (1)
else
root_tree.set_view_lines (1)
end
if view_line then
root_tree.set_view_mode (Gtk_tree_view_line)
else
root_tree.set_view_mode (Gtk_tree_view_item)
end
if no_root_item then
create_subtree (root_tree, -1, nb_item_max, recursion_level_max)
else
-- create a root item
!!root_item.make_with_label ("root item")
-- ?? root_tree.append_item (root_item)
root_tree.add_widget (root_item)
create_subtree (root_item, 1, nb_item_max, recursion_level_max)
end
-- create buttons
!!box2.make_vertical (False, 0)
box1.pack (box2, False, False, 0)
box2.set_border_width (5)
!!add_button.make_with_label ("Add Item")
!!add_cmd.make (root_tree)
add_button.add_action ("clicked", add_cmd)
add_button.set_sensitive (False)
box2.pack (add_button, True, True, 0)
!!remove_button.make_with_label ("Remove Item(s)")
!!remove_cmd.make (root_tree)
remove_button.add_action ("clicked", remove_cmd)
remove_button.set_sensitive (False)
box2.pack (remove_button, True, True, 0)
!!subtree_button.make_with_label ("Remove (Subtree)")
!!remove_subtree_cmd.make (root_tree)
subtree_button.add_action ("clicked", remove_subtree_cmd)
subtree_button.set_sensitive (False)
box2.pack (subtree_button, True, True, 0)
-- separator and close window button
!!separator.make_horizontal
box1.pack (separator, False, False, 0)
!!box2.make_vertical (False, 0)
box1.pack (box2, False, False, 0)
box2.set_border_width (5)
!!button.make_with_label ("Close")
!!close_cmd.make (window)
button.add_action ("clicked", close_cmd)
box2.pack (button, True, True, 0)
window.show_all
end
create_subtree (item: GTK_WIDGET; level, nb_item_max, recursion_level_max: INTEGER) is
local
item_subtree: GTK_TREE
an_item: GTK_TREE_ITEM
item_new: GTK_TREE_ITEM
no_root_item: BOOLEAN
l_level, nb_item: INTEGER
label: STRING
do
if level < recursion_level_max then
if level = -1 then
l_level := 0
item_subtree ?= item
no_root_item := True
else
l_level := level
an_item ?= item
!!item_subtree.make
end
from nb_item := 0 until nb_item > nb_item_max loop
label := clone ("item ")
label.append (level.out)
label.append ("-")
label.append (nb_item.out)
!!item_new.make_with_label (label)
-- ?? item_subtree.append_item (item_new)
item_subtree.add_widget (item_new)
create_subtree (item_new, l_level+1, nb_item_max, recursion_level_max)
item_new.show
nb_item := nb_item + 1
end
if not no_root_item then
an_item.set_subtree (item_subtree)
end
end
end
end
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