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# image3.rb
#
# This demonstration script creates a simple collection of widgets
# that allow you to select and view images in a Tk label.
#
# widget demo 'load image' (called by 'widget')
#
# toplevel widget
if defined?($image3_demo) && $image3_demo
$image3_demo.destroy
$image3_demo = nil
end
# demo toplevel widget
$image3_demo = TkToplevel.new {|w|
title('Image Demonstration #3')
iconname("Image3")
positionWindow(w)
}
base_frame = TkFrame.new($image3_demo).pack(:fill=>:both, :expand=>true)
#
def loadDir3(w)
w.delete(0,'end')
Dir.glob([$dirName,'*'].join(File::Separator)).sort.each{|f|
w.insert('end',File.basename(f))
}
end
# selectAndLoadDir3 --
# This procedure pops up a dialog to ask for a directory to load into
# the listobx and (if the user presses OK) reloads the directory
# listbox from the directory named in the demo's entry.
#
# Arguments:
# w - Name of the toplevel window of the demo.
def selectAndLoadDir3(w, lbox)
dir = Tk.chooseDirectory(:initialdir=>$dirName.value,
:parent=>w, :mustexist=>true)
if dir.length > 0
$dirName.value = dir
loadDir3(lbox)
end
end
def loadImage(w,x,y)
$image3a.file([$dirName, w.get("@#{x},#{y}")].join(File::Separator))
end
# label
msg = TkLabel.new(base_frame) {
font $font
wraplength '4i'
justify 'left'
text "This demonstration allows you to view images using a Tk \"photo\" image. First type a directory name in the listbox, then type Return to load the directory into the listbox. Then double-click on a file name in the listbox to see that image."
}
msg.pack('side'=>'top')
# frame
TkFrame.new(base_frame) {|frame|
TkButton.new(frame) {
text 'Dismiss'
command proc{
tmppath = $image3_demo
$image3_demo = nil
tmppath.destroy
}
}.pack('side'=>'left', 'expand'=>'yes')
TkButton.new(frame) {
text 'Show Code'
command proc{showCode 'image3'}
}.pack('side'=>'left', 'expand'=>'yes')
}.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
# variable
$dirName = TkVariable.new([$demo_dir,'..','images'].join(File::Separator))
# image
begin
$image3a.delete
rescue
end
$image3a = TkPhotoImage.new
#
image3_f = TkFrame.new(base_frame).pack(:fill=>:both, :expand=>true)
image3_df = TkLabelFrame.new(base_frame, :text=>'Directory:')
image3_ff = TkLabelFrame.new(base_frame, :text=>'File:',
:padx=>'2m', :pady=>'2m')
image3_lbx = TkListbox.new(image3_ff, :width=>20, :height=>10) {
pack(:side=>:left, :fill=>:y, :expand=>true)
yscrollbar(TkScrollbar.new(image3_ff).pack(:side=>:left, :fill=>:y,
:expand=>true))
insert(0, *(%w(earth.gif earthris.gif teapot.ppm)))
bind('Double-1', proc{|x,y| loadImage(self, x, y)}, '%x %y')
}
image3_ent = TkEntry.new(image3_df, :width=>30, :textvariable=>$dirName){
pack(:side=>:left, :fill=>:both, :padx=>'2m', :pady=>'2m', :expand=>true)
bind('Return', proc{loadDir3(image3_lbx)})
}
TkButton.new(image3_df, :pady=>0, :padx=>'2m', :text=>"Select Dir.",
:command=>proc{selectAndLoadDir3(image3_ent, image3_lbx)}) {
pack(:side=>:left, :fill=>:y, :padx=>[0, '2m'], :pady=>'2m')
}
image3_if = TkLabelFrame.new(base_frame, :text=>'Image:') {|f|
# TkLabel.new(f, :image=>$image3a).pack(:padx=>'2m', :pady=>'2m')
Tk::Label.new(f, :image=>$image3a).pack(:padx=>'2m', :pady=>'2m')
}
Tk.grid(image3_df, '-',
:sticky=>:ew, :padx=>'1m', :pady=>'1m', :in=>image3_f)
Tk.grid(image3_ff, image3_if,
:sticky=>:nw, :padx=>'1m', :pady=>'1m', :in=>image3_f)
TkGrid.columnconfigure(image3_f, 1, :weight=>1)
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