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Diffstat (limited to 'library/demos/ruler.tcl')
| -rw-r--r-- | library/demos/ruler.tcl | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/library/demos/ruler.tcl b/library/demos/ruler.tcl new file mode 100644 index 0000000..3c77c72 --- /dev/null +++ b/library/demos/ruler.tcl @@ -0,0 +1,173 @@ +# ruler.tcl -- +# +# This demonstration script creates a canvas widget that displays a ruler +# with tab stops that can be set, moved, and deleted. +# +# SCCS: @(#) ruler.tcl 1.9 97/03/02 16:17:33 + +if {![info exists widgetDemo]} { + error "This script should be run from the \"widget\" demo." +} + +# rulerMkTab -- +# This procedure creates a new triangular polygon in a canvas to +# represent a tab stop. +# +# Arguments: +# c - The canvas window. +# x, y - Coordinates at which to create the tab stop. + +proc rulerMkTab {c x y} { + upvar #0 demo_rulerInfo v + $c create polygon $x $y [expr $x+$v(size)] [expr $y+$v(size)] \ + [expr $x-$v(size)] [expr $y+$v(size)] +} + +set w .ruler +global tk_library +catch {destroy $w} +toplevel $w +wm title $w "Ruler Demonstration" +wm iconname $w "ruler" +positionWindow $w +set c $w.c + +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." +pack $w.msg -side top + +frame $w.buttons +pack $w.buttons -side bottom -fill x -pady 2m +button $w.buttons.dismiss -text Dismiss -command "destroy $w" +button $w.buttons.code -text "See Code" -command "showCode $w" +pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 + +canvas $c -width 14.8c -height 2.5c +pack $w.c -side top -fill x + +set demo_rulerInfo(grid) .25c +set demo_rulerInfo(left) [winfo fpixels $c 1c] +set demo_rulerInfo(right) [winfo fpixels $c 13c] +set demo_rulerInfo(top) [winfo fpixels $c 1c] +set demo_rulerInfo(bottom) [winfo fpixels $c 1.5c] +set demo_rulerInfo(size) [winfo fpixels $c .2c] +set demo_rulerInfo(normalStyle) "-fill black" +if {[winfo depth $c] > 1} { + set demo_rulerInfo(activeStyle) "-fill red -stipple {}" + set demo_rulerInfo(deleteStyle) [list -fill red \ + -stipple @[file join $tk_library demos images gray25.bmp]] +} else { + set demo_rulerInfo(activeStyle) "-fill black -stipple {}" + set demo_rulerInfo(deleteStyle) [list -fill black \ + -stipple @[file join $tk_library demos images gray25.bmp]] +} + +$c create line 1c 0.5c 1c 1c 13c 1c 13c 0.5c -width 1 +for {set i 0} {$i < 12} {incr i} { + set x [expr $i+1] + $c create line ${x}c 1c ${x}c 0.6c -width 1 + $c create line $x.25c 1c $x.25c 0.8c -width 1 + $c create line $x.5c 1c $x.5c 0.7c -width 1 + $c create line $x.75c 1c $x.75c 0.8c -width 1 + $c create text $x.15c .75c -text $i -anchor sw +} +$c addtag well withtag [$c create rect 13.2c 1c 13.8c 0.5c \ + -outline black -fill [lindex [$c config -bg] 4]] +$c addtag well withtag [rulerMkTab $c [winfo pixels $c 13.5c] \ + [winfo pixels $c .65c]] + +$c bind well <1> "rulerNewTab $c %x %y" +$c bind tab <1> "rulerSelectTab $c %x %y" +bind $c <B1-Motion> "rulerMoveTab $c %x %y" +bind $c <Any-ButtonRelease-1> "rulerReleaseTab $c" + +# rulerNewTab -- +# Does all the work of creating a tab stop, including creating the +# triangle object and adding tags to it to give it tab behavior. +# +# Arguments: +# c - The canvas window. +# x, y - The coordinates of the tab stop. + +proc rulerNewTab {c x y} { + upvar #0 demo_rulerInfo v + $c addtag active withtag [rulerMkTab $c $x $y] + $c addtag tab withtag active + set v(x) $x + set v(y) $y + rulerMoveTab $c $x $y +} + +# rulerSelectTab -- +# This procedure is invoked when mouse button 1 is pressed over +# a tab. It remembers information about the tab so that it can +# be dragged interactively. +# +# Arguments: +# c - The canvas widget. +# x, y - The coordinates of the mouse (identifies the point by +# which the tab was picked up for dragging). + +proc rulerSelectTab {c x y} { + upvar #0 demo_rulerInfo v + set v(x) [$c canvasx $x $v(grid)] + set v(y) [expr $v(top)+2] + $c addtag active withtag current + eval "$c itemconf active $v(activeStyle)" + $c raise active +} + +# rulerMoveTab -- +# This procedure is invoked during mouse motion events to drag a tab. +# It adjusts the position of the tab, and changes its appearance if +# it is about to be dragged out of the ruler. +# +# Arguments: +# c - The canvas widget. +# x, y - The coordinates of the mouse. + +proc rulerMoveTab {c x y} { + upvar #0 demo_rulerInfo v + if {[$c find withtag active] == ""} { + return + } + set cx [$c canvasx $x $v(grid)] + set cy [$c canvasy $y] + if {$cx < $v(left)} { + set cx $v(left) + } + if {$cx > $v(right)} { + set cx $v(right) + } + if {($cy >= $v(top)) && ($cy <= $v(bottom))} { + set cy [expr $v(top)+2] + eval "$c itemconf active $v(activeStyle)" + } else { + set cy [expr $cy-$v(size)-2] + eval "$c itemconf active $v(deleteStyle)" + } + $c move active [expr $cx-$v(x)] [expr $cy-$v(y)] + set v(x) $cx + set v(y) $cy +} + +# rulerReleaseTab -- +# This procedure is invoked during button release events that end +# a tab drag operation. It deselects the tab and deletes the tab if +# it was dragged out of the ruler. +# +# Arguments: +# c - The canvas widget. +# x, y - The coordinates of the mouse. + +proc rulerReleaseTab c { + upvar #0 demo_rulerInfo v + if {[$c find withtag active] == {}} { + return + } + if {$v(y) != [expr $v(top)+2]} { + $c delete active + } else { + eval "$c itemconf active $v(normalStyle)" + $c dtag active + } +} |