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172 lines
5.1 KiB
172 lines
5.1 KiB
# ruler.tcl --
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#
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# This demonstration script creates a canvas widget that displays a ruler
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# with tab stops that can be set, moved, and deleted.
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if {![info exists widgetDemo]} {
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error "This script should be run from the \"widget\" demo."
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}
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package require Tk
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# rulerMkTab --
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# This procedure creates a new triangular polygon in a canvas to
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# represent a tab stop.
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#
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# Arguments:
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# c - The canvas window.
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# x, y - Coordinates at which to create the tab stop.
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proc rulerMkTab {c x y} {
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upvar #0 demo_rulerInfo v
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$c create polygon $x $y [expr {$x+$v(size)}] [expr {$y+$v(size)}] \
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[expr {$x-$v(size)}] [expr {$y+$v(size)}]
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}
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set w .ruler
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catch {destroy $w}
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toplevel $w
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wm title $w "Ruler Demonstration"
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wm iconname $w "ruler"
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positionWindow $w
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set c $w.c
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label $w.msg -font $font -wraplength 5i -justify left -text "This canvas widget shows a mock-up of a ruler. You can create tab stops by dragging them out of the well to the right of the ruler. You can also drag existing tab stops. If you drag a tab stop far enough up or down so that it turns dim, it will be deleted when you release the mouse button."
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pack $w.msg -side top
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## See Code / Dismiss buttons
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set btns [addSeeDismiss $w.buttons $w]
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pack $btns -side bottom -fill x
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canvas $c -width 14.8c -height 2.5c
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pack $w.c -side top -fill x
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set demo_rulerInfo(grid) .25c
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set demo_rulerInfo(left) [winfo fpixels $c 1c]
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set demo_rulerInfo(right) [winfo fpixels $c 13c]
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set demo_rulerInfo(top) [winfo fpixels $c 1c]
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set demo_rulerInfo(bottom) [winfo fpixels $c 1.5c]
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set demo_rulerInfo(size) [winfo fpixels $c .2c]
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set demo_rulerInfo(normalStyle) "-fill black"
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# Main widget program sets variable tk_demoDirectory
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if {[winfo depth $c] > 1} {
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set demo_rulerInfo(activeStyle) "-fill red -stipple {}"
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set demo_rulerInfo(deleteStyle) [list -fill red \
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-stipple @[file join $tk_demoDirectory images gray25.xbm]]
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} else {
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set demo_rulerInfo(activeStyle) "-fill black -stipple {}"
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set demo_rulerInfo(deleteStyle) [list -fill black \
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-stipple @[file join $tk_demoDirectory images gray25.xbm]]
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}
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$c create line 1c 0.5c 1c 1c 13c 1c 13c 0.5c -width 1
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for {set i 0} {$i < 12} {incr i} {
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set x [expr {$i+1}]
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$c create line ${x}c 1c ${x}c 0.6c -width 1
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$c create line $x.25c 1c $x.25c 0.8c -width 1
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$c create line $x.5c 1c $x.5c 0.7c -width 1
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$c create line $x.75c 1c $x.75c 0.8c -width 1
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$c create text $x.15c .75c -text $i -anchor sw
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}
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$c addtag well withtag [$c create rect 13.2c 1c 13.8c 0.5c \
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-outline black -fill [lindex [$c config -bg] 4]]
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$c addtag well withtag [rulerMkTab $c [winfo pixels $c 13.5c] \
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[winfo pixels $c .65c]]
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$c bind well <1> "rulerNewTab $c %x %y"
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$c bind tab <1> "rulerSelectTab $c %x %y"
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bind $c <B1-Motion> "rulerMoveTab $c %x %y"
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bind $c <Any-ButtonRelease-1> "rulerReleaseTab $c"
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# rulerNewTab --
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# Does all the work of creating a tab stop, including creating the
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# triangle object and adding tags to it to give it tab behavior.
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#
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# Arguments:
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# c - The canvas window.
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# x, y - The coordinates of the tab stop.
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proc rulerNewTab {c x y} {
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upvar #0 demo_rulerInfo v
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$c addtag active withtag [rulerMkTab $c $x $y]
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$c addtag tab withtag active
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set v(x) $x
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set v(y) $y
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rulerMoveTab $c $x $y
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}
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# rulerSelectTab --
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# This procedure is invoked when mouse button 1 is pressed over
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# a tab. It remembers information about the tab so that it can
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# be dragged interactively.
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#
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# Arguments:
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# c - The canvas widget.
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# x, y - The coordinates of the mouse (identifies the point by
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# which the tab was picked up for dragging).
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proc rulerSelectTab {c x y} {
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upvar #0 demo_rulerInfo v
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set v(x) [$c canvasx $x $v(grid)]
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set v(y) [expr {$v(top)+2}]
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$c addtag active withtag current
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eval "$c itemconf active $v(activeStyle)"
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$c raise active
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}
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# rulerMoveTab --
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# This procedure is invoked during mouse motion events to drag a tab.
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# It adjusts the position of the tab, and changes its appearance if
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# it is about to be dragged out of the ruler.
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#
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# Arguments:
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# c - The canvas widget.
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# x, y - The coordinates of the mouse.
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proc rulerMoveTab {c x y} {
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upvar #0 demo_rulerInfo v
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if {[$c find withtag active] == ""} {
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return
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}
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set cx [$c canvasx $x $v(grid)]
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set cy [$c canvasy $y]
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if {$cx < $v(left)} {
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set cx $v(left)
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}
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if {$cx > $v(right)} {
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set cx $v(right)
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}
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if {($cy >= $v(top)) && ($cy <= $v(bottom))} {
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set cy [expr {$v(top)+2}]
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eval "$c itemconf active $v(activeStyle)"
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} else {
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set cy [expr {$cy-$v(size)-2}]
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eval "$c itemconf active $v(deleteStyle)"
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}
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$c move active [expr {$cx-$v(x)}] [expr {$cy-$v(y)}]
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set v(x) $cx
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set v(y) $cy
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}
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# rulerReleaseTab --
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# This procedure is invoked during button release events that end
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# a tab drag operation. It deselects the tab and deletes the tab if
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# it was dragged out of the ruler.
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#
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# Arguments:
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# c - The canvas widget.
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# x, y - The coordinates of the mouse.
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proc rulerReleaseTab c {
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upvar #0 demo_rulerInfo v
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if {[$c find withtag active] == {}} {
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return
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}
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if {$v(y) != $v(top)+2} {
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$c delete active
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} else {
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eval "$c itemconf active $v(normalStyle)"
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$c dtag active
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}
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}
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