Initial class construction

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

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+# clrpick.tcl --
+#
+# This demonstration script prompts the user to select a color.
+
+if {![info exists widgetDemo]} {
+    error "This script should be run from the \"widget\" demo."
+}
+
+package require Tk
+
+set w .clrpick
+catch {destroy $w}
+toplevel $w
+wm title $w "Color Selection Dialog"
+wm iconname $w "colors"
+positionWindow $w
+
+label $w.msg -font $font -wraplength 4i -justify left -text "Press the buttons below to choose the foreground and background colors for the widgets in this window."
+pack $w.msg -side top
+
+## See Code / Dismiss buttons
+set btns [addSeeDismiss $w.buttons $w]
+pack $btns -side bottom -fill x
+
+button $w.back -text "Set background color ..." \
+    -command \
+    "setColor $w $w.back background {-background -highlightbackground}"
+button $w.fore -text "Set foreground color ..." \
+    -command \
+    "setColor $w $w.back foreground -foreground"
+
+pack $w.back $w.fore -side top -anchor c -pady 2m
+
+proc setColor {w button name options} {
+    grab $w
+    set initialColor [$button cget -$name]
+    set color [tk_chooseColor -title "Choose a $name color" -parent $w \
+	-initialcolor $initialColor]
+    if {[string compare $color ""]} {
+	setColor_helper $w $options $color
+    }
+    grab release $w
+}
+
+proc setColor_helper {w options color} {
+    foreach option $options {
+	catch {
+	    $w config $option $color
+	}
+    }
+    foreach child [winfo children $w] {
+	setColor_helper $child $options $color
+    }
+}