* add widget demo scripts

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4297 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/tk/sample/demos-en/image3.rb

@@ -0,0 +1,121 @@
+# 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)
+}
+
+# 
+def loadDir(w)
+  w.delete(0,'end')
+  Dir.glob([$dirName,'*'].join(File::Separator)).sort.each{|f|
+    w.insert('end',File.basename(f))
+  }
+end
+
+# selectAndLoadDir --
+# This procedure pops up a dialog to ask for a directory to load into
+# the listobx and (if the user presses OK) reloads the directory
+# listbox from the directory named in the demo's entry.
+#
+# Arguments:
+# w -			Name of the toplevel window of the demo.
+def selectAndLoadDir(w, lbox)
+  dir = Tk.chooseDirectory(:initialdir=>$dirName, :parent=>w, :mustexist=>true)
+  if dir.length > 0
+    $dirName.value = dir 
+    loadDir(lbox)
+  end
+end
+
+def loadImage(w,x,y)
+  $image3a.file([$dirName, w.get("@#{x},#{y}")].join(File::Separator))
+end
+
+
+# label
+msg = TkLabel.new($image3_demo) {
+  font $font
+  wraplength '4i'
+  justify 'left'
+  text "This demonstration allows you to view images using a Tk \"photo\" image.  First type a directory name in the listbox, then type Return to load the directory into the listbox.  Then double-click on a file name in the listbox to see that image."
+}
+msg.pack('side'=>'top')
+
+# frame
+TkFrame.new($image3_demo) {|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($image3_demo).pack(:fill=>:both, :expand=>true)
+
+image3_df = TkLabelFrame.new($image3_demo, :text=>'Directory:')
+
+image3_ff = TkLabelFrame.new($image3_demo, :text=>'File:', 
+			     :padx=>'2m', :pady=>'2m')
+image3_lbx = TkListbox.new(image3_ff, :width=>20, :height=>10) {
+  pack(:side=>:left, :fill=>:y, :expand=>true)
+  yscrollbar(TkScrollbar.new(image3_ff).pack(:side=>:left, :fill=>:y, 
+					     :expand=>true))
+  insert(0, *(%w(earth.gif earthris.gif teapot.ppm)))
+  bind('Double-1', proc{|x,y| loadImage(self, x, y)}, '%x %y')
+}
+
+image3_ent = TkEntry.new(image3_df, :width=>30, :textvariable=>$dirName){
+  pack(:side=>:left, :fill=>:both, :padx=>'2m', :pady=>'2m', :expand=>true)
+  bind('Return', proc{loadDir(image3_lbx)})
+}
+
+TkButton.new(image3_df, :pady=>0, :padx=>'2m', :text=>"Select Dir.", 
+	     :command=>proc{selectAndLoadDir(image3_ent, image3_lbx)}) {
+  pack(:side=>:left, :fill=>:y, :padx=>[0, '2m'], :pady=>'2m')
+}
+
+image3_if = TkLabelFrame.new($image3_demo, :text=>'Image:') {|f|
+  TkLabel.new(f, :image=>$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)
+