Initial class construction

Git/mingw64/lib/tk8.6/demos/image2.tcl

@@ -0,0 +1,108 @@
+# image2.tcl --
+#
+# This demonstration script creates a simple collection of widgets
+# that allow you to select and view images in a Tk label.
+
+if {![info exists widgetDemo]} {
+    error "This script should be run from the \"widget\" demo."
+}
+
+package require Tk
+
+# loadDir --
+# This procedure reloads the directory listbox from the directory
+# named in the demo's entry.
+#
+# Arguments:
+# w -			Name of the toplevel window of the demo.
+
+proc loadDir w {
+    global dirName
+
+    $w.f.list delete 0 end
+    foreach i [lsort [glob -type f -directory $dirName *]] {
+	$w.f.list insert end [file tail $i]
+    }
+}
+
+# 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.
+
+proc selectAndLoadDir w {
+    global dirName
+    set dir [tk_chooseDirectory -initialdir $dirName -parent $w -mustexist 1]
+    if {$dir ne ""} {
+	set dirName $dir
+	loadDir $w
+    }
+}
+
+# loadImage --
+# Given the name of the toplevel window of the demo and the mouse
+# position, extracts the directory entry under the mouse and loads
+# that file into a photo image for display.
+#
+# Arguments:
+# w -			Name of the toplevel window of the demo.
+# x, y-			Mouse position within the listbox.
+
+proc loadImage {w x y} {
+    global dirName
+
+    set file [file join $dirName [$w.f.list get @$x,$y]]
+    if {[catch {
+	image2a configure -file $file
+    }]} then {
+	# Mark the file as not loadable
+	$w.f.list itemconfigure @$x,$y -bg \#c00000 -selectbackground \#ff0000
+    }
+}
+
+set w .image2
+catch {destroy $w}
+toplevel $w
+wm title $w "Image Demonstration #2"
+wm iconname $w "Image2"
+positionWindow $w
+
+label $w.msg -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."
+pack $w.msg -side top
+
+## See Code / Dismiss buttons
+set btns [addSeeDismiss $w.buttons $w]
+pack $btns -side bottom -fill x
+
+frame $w.mid
+pack $w.mid -fill both -expand 1
+
+labelframe $w.dir -text "Directory:"
+# Main widget program sets variable tk_demoDirectory
+set dirName [file join $tk_demoDirectory images]
+entry $w.dir.e -width 30 -textvariable dirName
+button $w.dir.b -pady 0 -padx 2m -text "Select Dir." \
+	-command "selectAndLoadDir $w"
+bind $w.dir.e <Return> "loadDir $w"
+pack $w.dir.e -side left -fill both -padx 2m     -pady 2m -expand true
+pack $w.dir.b -side left -fill y    -padx {0 2m} -pady 2m
+labelframe $w.f -text "File:" -padx 2m -pady 2m
+
+listbox $w.f.list -width 20 -height 10 -yscrollcommand "$w.f.scroll set"
+ttk::scrollbar $w.f.scroll -command "$w.f.list yview"
+pack $w.f.list $w.f.scroll -side left -fill y -expand 1
+$w.f.list insert 0 earth.gif earthris.gif teapot.ppm
+bind $w.f.list <Double-1> "loadImage $w %x %y"
+
+catch {image delete image2a}
+image create photo image2a
+labelframe $w.image -text "Image:"
+label $w.image.image -image image2a
+pack $w.image.image -padx 2m -pady 2m
+
+grid $w.dir -        -sticky ew -padx 1m -pady 1m -in $w.mid
+grid $w.f   $w.image -sticky nw -padx 1m -pady 1m -in $w.mid
+grid columnconfigure $w.mid 1 -weight 1