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windowsAgent/dist/tk/ttk/scrollbar.tcl

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+#
+# Bindings for TScrollbar widget
+#
+
+# Still don't have a working ttk::scrollbar under OSX -
+# Swap in a [tk::scrollbar] on that platform,
+# unless user specifies -class or -style.
+#
+if {[tk windowingsystem] eq "aqua"} {
+    rename ::ttk::scrollbar ::ttk::_scrollbar
+    proc ttk::scrollbar {w args} {
+	set constructor ::tk::scrollbar
+	foreach {option _} $args {
+	    if {$option eq "-class" || $option eq "-style"} {
+		set constructor ::ttk::_scrollbar
+		break
+	    }
+	}
+	return [$constructor $w {*}$args]
+    }
+}
+
+namespace eval ttk::scrollbar {
+    variable State
+    # State(xPress)	--
+    # State(yPress)	-- initial position of mouse at start of drag.
+    # State(first)	-- value of -first at start of drag.
+}
+
+bind TScrollbar <ButtonPress-1> 	{ ttk::scrollbar::Press %W %x %y }
+bind TScrollbar <B1-Motion>		{ ttk::scrollbar::Drag %W %x %y }
+bind TScrollbar <ButtonRelease-1>	{ ttk::scrollbar::Release %W %x %y }
+
+bind TScrollbar <ButtonPress-2> 	{ ttk::scrollbar::Jump %W %x %y }
+bind TScrollbar <B2-Motion>		{ ttk::scrollbar::Drag %W %x %y }
+bind TScrollbar <ButtonRelease-2>	{ ttk::scrollbar::Release %W %x %y }
+
+proc ttk::scrollbar::Scroll {w n units} {
+    set cmd [$w cget -command]
+    if {$cmd ne ""} {
+	uplevel #0 $cmd scroll $n $units
+    }
+}
+
+proc ttk::scrollbar::Moveto {w fraction} {
+    set cmd [$w cget -command]
+    if {$cmd ne ""} {
+	uplevel #0 $cmd moveto $fraction
+    }
+}
+
+proc ttk::scrollbar::Press {w x y} {
+    variable State
+
+    set State(xPress) $x
+    set State(yPress) $y
+
+    switch -glob -- [$w identify $x $y] {
+    	*uparrow -
+	*leftarrow {
+	    ttk::Repeatedly Scroll $w -1 units
+	}
+	*downarrow -
+	*rightarrow {
+	    ttk::Repeatedly Scroll $w  1 units
+	}
+	*thumb {
+	    set State(first) [lindex [$w get] 0]
+	}
+	*trough {
+	    set f [$w fraction $x $y]
+	    if {$f < [lindex [$w get] 0]} {
+		# Clicked in upper/left trough
+		ttk::Repeatedly Scroll $w -1 pages
+	    } elseif {$f > [lindex [$w get] 1]} {
+		# Clicked in lower/right trough
+		ttk::Repeatedly Scroll $w 1 pages
+	    } else {
+		# Clicked on thumb (???)
+		set State(first) [lindex [$w get] 0]
+	    }
+	}
+    }
+}
+
+proc ttk::scrollbar::Drag {w x y} {
+    variable State
+    if {![info exists State(first)]} {
+    	# Initial buttonpress was not on the thumb, 
+	# or something screwy has happened.  In either case, ignore:
+	return;
+    }
+    set xDelta [expr {$x - $State(xPress)}]
+    set yDelta [expr {$y - $State(yPress)}]
+    Moveto $w [expr {$State(first) + [$w delta $xDelta $yDelta]}]
+}
+
+proc ttk::scrollbar::Release {w x y} {
+    variable State
+    unset -nocomplain State(xPress) State(yPress) State(first)
+    ttk::CancelRepeat
+}
+
+# scrollbar::Jump -- ButtonPress-2 binding for scrollbars.
+# 	Behaves exactly like scrollbar::Press, except that
+#	clicking in the trough jumps to the the selected position.
+#
+proc ttk::scrollbar::Jump {w x y} {
+    variable State
+
+    switch -glob -- [$w identify $x $y] {
+	*thumb -
+	*trough {
+	    set State(first) [$w fraction $x $y]
+	    Moveto $w $State(first)
+	    set State(xPress) $x
+	    set State(yPress) $y
+	}
+	default {
+	    Press $w $x $y
+	}
+    }
+}