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