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# tree.rb --
#
# This demonstration script creates a toplevel window containing a Ttk
# tree widget.
#
# based on "Id: tree.tcl,v 1.4 2007/12/13 15:27:07 dgp Exp"
if defined?($tree_demo) && $tree_demo
$tree_demo.destroy
$tree_demo = nil
end
$tree_demo = TkToplevel.new {|w|
title("Directory Browser")
iconname("tree")
positionWindow(w)
}
base_frame = TkFrame.new($tree_demo).pack(:fill=>:both, :expand=>true)
## Explanatory text
Ttk::Label.new(base_frame, :font=>$font, :wraplength=>'4i',
:justify=>:left, :anchor=>'n', :padding=>[10, 2, 10, 6],
:text=><<EOL).pack(:fill=>:x)
Ttk is the new Tk themed widget set. \
One of the widgets it includes is a tree widget, \
which allows the user to browse a hierarchical data-set such as a filesystem. \
The tree widget not only allows for the tree part itself, \
but it also supports an arbitrary number of additional columns \
which can show additional data (in this case, the size of the files \
found in your filesystem). \
You can also change the width of the columns \
by dragging the boundary between them.
EOL
## See Code / Dismiss
Ttk::Frame.new(base_frame) {|frame|
sep = Ttk::Separator.new(frame)
Tk.grid(sep, :columnspan=>4, :row=>0, :sticky=>'ew', :pady=>2)
TkGrid('x',
Ttk::Button.new(frame, :text=>'See Code',
:image=>$image['view'], :compound=>:left,
:command=>proc{showCode 'tree'}),
Ttk::Button.new(frame, :text=>'Dismiss',
:image=>$image['delete'], :compound=>:left,
:command=>proc{
$tree_demo.destroy
$tree_demo = nil
}),
:padx=>4, :pady=>4)
grid_columnconfigure(0, :weight=>1)
pack(:side=>:bottom, :fill=>:x)
}
## Code to populate the roots of the tree (can be more than one on Windows)
def populate_roots(tree)
TkComm.simplelist(Tk.tk_call('file', 'volumes')).sort.each{|dir|
populate_tree(tree, tree.insert(nil, :end, :text=>dir,
:values=>[dir, 'directory']))
}
end
## Code to populate a node of the tree
def populate_tree(tree, node)
return if tree.get(node, :type) != 'directory'
path = tree.get(node, :fullpath)
tree.delete(tree.children(node))
Dir.glob("#{path}/*").sort.each{|f|
type = File.ftype(f) rescue nil
id = tree.insert(node, :end,
:text=>File.basename(f), :values=>[f, type]).id
if type == 'directory'
## Make it so that this node is openable
tree.insert(id, 0, :text=>'dummy')
tree.itemconfigure(id, :text=>File.basename(f))
elsif type == 'file'
size = File.size(f)
if size >= 1024*1024*1024
size = '%.1f GB' % (size.to_f/1024/1024/1024)
elsif size >= 1024*1024
size = '%.1f MB' % (size.to_f/1024/1024)
elsif size >= 1024
size = '%.1f KB' % (size.to_f/1024)
else
size = '%.1f bytes' % (size.to_f/1024)
end
tree.set(id, :size, size)
end
}
# Stop this code from rerunning on the current node
tree.set(node, :type, 'processed_directory')
end
## Create the tree and set it up
tree = Ttk::Treeview.new(base_frame, :columns=>%w(fullpath type size),
:displaycolumns=>['size'])
if Tk.windowingsystem != 'aqua'
vsb = tree.yscrollbar(Ttk::Scrollbar.new(base_frame))
hsb = tree.xscrollbar(Ttk::Scrollbar.new(base_frame))
else
vsb = tree.yscrollbar(Tk::Scrollbar.new(base_frame))
hsb = tree.xscrollbar(Tk::Scrollbar.new(base_frame))
end
tree.heading_configure('#0', :text=>'Directory Structure')
tree.heading_configure('size', :text=>'File Size')
tree.column_configure('size', :stretch=>0, :width=>70)
populate_roots(tree)
tree.bind('<TreeviewOpen>', '%W'){|w| populate_tree(w, w.focus_item)}
## Arrange the tree and its scrollbars in the toplevel
container = Ttk::Frame.new(base_frame).pack(:fill=>:both, :expand=>true)
container.lower
Tk.grid(tree, vsb, :in=>container, :sticky=>'nsew')
Tk.grid(hsb, :in=>container, :sticky=>'nsew')
container.grid_columnconfigure(0, :weight=>1)
container.grid_rowconfigure(0, :weight=>1)
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