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|
# copyright (C) 1997-98 Jean-Luc Fontaine (mailto:jfontain@mygale.org)
# this program is free software: please read the COPYRIGHT file enclosed in this package or use the Help Copyright menu
set rcsId {$Id: canvhand.tcl,v 1.18 1998/07/11 09:56:54 jfontain Exp $}
class canvasWindowManager {
class handles { ;# embed widget in a frame with handles for resizing and moving inside a canvas acting as a window manager
proc handles {this parentPath args} composite {[new frame $parentPath] $args} {
if {[string compare [winfo class $parentPath] Canvas]!=0} {
error "parent must be the manager canvas"
}
set ($this,item) [$parentPath create window 0 0 -window $widget::($this,path) -anchor nw]
set ($this,canvas) $parentPath
composite::complete $this
}
proc ~handles {this} {
[set ($this,canvas)] delete [set ($this,item)] outline ;# delete canvas items (eventually outline)
catch {delete [set ($this,bindings)]} ;# eventually delete bindings
}
proc options {this} {
return [list\
[list\
-background background Background\
$widget::(default,ButtonBackgroundColor) $widget::(default,ButtonBackgroundColor)\
]\
[list -borderwidth borderWidth BorderWidth 3]\
[list -handlesize handleSize HandleSize 7 7]\
[list -path path Path {} {}]\
[list -relief relief Relief ridge]\
[list -setheight setHeight SetHeight {} {}]\
[list -setwidth setWidth SetWidth {} {}]\
[list -setx setX SetX 0 0]\
[list -sety setY SetY 0 0]\
[list -static static Static 0]\
]
}
proc set-handlesize {this value} {
resize $this [winfo width $widget::($this,path)] [winfo height $widget::($this,path)] ;# recalculate handles
}
proc set-path {this value} {
if {![winfo exists $value]} {
error "invalid widget: \"$value\""
}
set path $widget::($this,path)
catch {eval pack forget [pack slaves $path]} ;# eventually forget existing widget
catch {delete [set ($this,bindings)]} ;# eventually delete existing bindings
set ($this,bindings) [new bindings $value end]
bindings::set [set ($this,bindings)] <Visibility>\
"set canvasWindowManager::handles::($this,partiallyObscured) \[string compare %s VisibilityUnobscured\]"
raise $value $path
pack $value -in $path -fill both -expand 1 ;# expand as manager frame
}
foreach option {-background -relief -borderwidth} {
proc set$option {this value} "\$widget::(\$this,path) configure $option \$value"
}
proc set-setheight {this value} {
[set ($this,canvas)] itemconfigure [set ($this,item)] -height $value
}
proc set-setwidth {this value} {
[set ($this,canvas)] itemconfigure [set ($this,item)] -width $value
}
proc set-setx {this value} {
[set ($this,canvas)] coords [set ($this,item)] $value [lindex [[set ($this,canvas)] coords [set ($this,item)]] end]
}
proc set-sety {this value} {
[set ($this,canvas)] coords [set ($this,item)] [lindex [[set ($this,canvas)] coords [set ($this,item)]] 0] $value
}
proc set-static {this value} {
set path $widget::($this,path)
if {$value} {
bind $path <Configure> {}
bind $path <Motion> {}
bind $path <Enter> {}
bind $path <Button1-Motion> {}
bind $path <ButtonPress-1> {}
bind $path <ButtonRelease-1> "canvasWindowManager::handles::toggleVisibility $this"
$path configure -cursor arrow ;# neutral cursor for user feedback since visibility toggling action is allowed
} else {
bind $path <Configure> "canvasWindowManager::handles::resize $this %w %h" ;# monitor size changes
bind $path <Motion> "canvasWindowManager::handles::setCursor $this %x %y"
# when just entering window, no motion event is yet generated
bind $path <Enter> "canvasWindowManager::handles::setCursor $this %x %y"
bind $path <Button1-Motion> "canvasWindowManager::handles::buttonMotion $this %x %y"
bind $path <ButtonPress-1> "canvasWindowManager::handles::buttonPress $this %x %y"
bind $path <ButtonRelease-1> "canvasWindowManager::handles::buttonRelease $this"
}
}
proc buttonMotion {this x y} {
set (motion) {}
updateOutline $this $x $y
}
proc buttonPress {this x y} {
set canvasWindowManager::handles::(xLast) $x ;### Tcl BUG: should be set ([xy]Last) $... ###
set canvasWindowManager::handles::(yLast) $y
lifoLabel::push $::messenger {} ;# in case no other string is pushed before button release event pops messenger
createOutline $this
}
proc toggleVisibility {this} {
if {[set ($this,partiallyObscured)]} {
raise $widget::($this,path) ;# place on top is partially hidden by another window
} else {
lower $widget::($this,path) ;# else place below other windows so they get a chance to be visible
}
catch {raise $composite::($this,-path) $widget::($this,path)} ;# maintain managed widget (if it exists) just above frame
}
proc buttonRelease {this} {
lifoLabel::pop $::messenger
if {[info exists (motion)]} { ;# moving or resizing occured
updateGeometry $this
raise $widget::($this,path) ;# always place frame on top after acting on it
# maintain managed widget (if it exists) just above frame
catch {raise $composite::($this,-path) $widget::($this,path)}
unset (motion)
} else { ;# no moving or resizing occured
toggleVisibility $this
}
destroyOutline $this
unset (xLast) (yLast) (hidden)
}
proc resize {this width height} {
# handle size should not be less than border width because of corners
set size [maximum $composite::($this,-handlesize) $composite::($this,-borderwidth)]
# recalculate handles limits
# mid handle size is 1/3 of side but mid handles disappear when frame gets too small so that it stays movable
set halfHeight [expr {($height/2)}]
set ($this,topHandleBottom) [minimum $size $halfHeight] ;# top corner handle bottom cannot exceed half height
set ($this,bottomHandleTop) [expr {$height-[set ($this,topHandleBottom)]}]
# mid handle top cannot be to close to top corner handle bottom
set ($this,midHandleTop) [maximum [expr {$height/3}] [expr {[set ($this,topHandleBottom)]+$size}]]
# mid handle bottom limit cannot be greater than bottom corner handle top
set ($this,midHandleBottom) [minimum [expr {(2*$height)/3}] [expr {[set ($this,bottomHandleTop)]-$size}]]
# note: mid handle top can be greater than mid handle bottom when handle disappears
set halfWidth [expr {($width/2)}]
set ($this,leftHandleRight) [minimum $size $halfWidth] ;# left corner handle right cannot exceed half width
set ($this,rightHandleLeft) [expr {$width-[set ($this,leftHandleRight)]}]
# mid handle left cannot be less than left corner handle right
set ($this,midHandleLeft) [maximum [expr {$width/3}] [expr {[set ($this,leftHandleRight)]+$size}]]
# mid handle right limit cannot be greater than right corner handle left
set ($this,midHandleRight) [minimum [expr {(2*$width)/3}] [expr {[set ($this,rightHandleLeft)]-$size}]]
# note: mid handle left can be greater than mid handle right when handle disappears
}
proc setCursor {this x y} {
if {[info exists (motion)]} {
return ;# make sure not to change cursor while moving outline (may happen when pointer passes over manager frame)
}
set border $composite::($this,-borderwidth)
set path $widget::($this,path)
set cursor fleur ;# use moving cursor outside borders
set direction {}
if {$x<$border} {
set side left
set direction w
} elseif {$x>=([winfo width $path]-$border)} {
set side right
set direction e
}
if {[info exists side]} { ;# in a vertical border
if {$y<[set ($this,topHandleBottom)]} {
set cursor top_${side}_corner
append direction n
} elseif {$y>[set ($this,bottomHandleTop)]} {
set cursor bottom_${side}_corner
append direction s
} elseif {($y>[set ($this,midHandleTop)])&&($y<[set ($this,midHandleBottom)])} {
set cursor ${side}_side
} else {
set cursor fleur
set direction {}
}
} else {
if {$y<$border} {
set side top
set direction n
} elseif {$y>=([winfo height $path]-$border)} {
set side bottom
set direction s
}
if {[info exists side]} { ;# in an horizontal border
if {$x<[set ($this,leftHandleRight)]} {
set cursor ${side}_left_corner
append direction w
} elseif {$x>[set ($this,rightHandleLeft)]} {
set cursor ${side}_right_corner
append direction e
} elseif {($x>[set ($this,midHandleLeft)])&&($x<[set ($this,midHandleRight)])} {
set cursor ${side}_side
} else {
set cursor fleur
set direction {}
}
}
}
if {[string compare $cursor [$widget::($this,path) cget -cursor]]!=0} { ;# update cursor only when needed
$widget::($this,path) configure -cursor $cursor
update idletasks ;# make cursor immediately visible for user feedback
}
set ($this,direction) $direction
}
proc updateOutline {this x y} { ;# coordinates are relative to manager frame
lifoLabel::pop $::messenger ;# remove previous coordinates or size
if {[set (hidden)]} { ;# make sure outline is fully visible
positionOutlineInStackingOrder $this raise
}
set canvas [set ($this,canvas)]
set coordinates [$canvas coords [set ($this,item)]]
# make sure that pointer stays within canvas boundaries
set xFrame [lindex $coordinates 0]
set yFrame [lindex $coordinates 1]
if {($xFrame+$x)<0} {
set x [expr {-$xFrame}] ;# use expr to properly handle consecutive signs
}
if {($yFrame+$y)<0} {
set y [expr {-$yFrame}] ;# use expr to properly handle consecutive signs
}
set width [winfo width $canvas]
if {($xFrame+$x)>=$width} {
set x [expr {$width-$xFrame-1}]
}
set height [winfo height $canvas]
if {($yFrame+$y)>=$height} {
set y [expr {$height-$yFrame-1}]
}
if {[string length [set ($this,direction)]]==0} { ;# moving, not resizing
$canvas move outline [expr {$x-[set (xLast)]}] [expr {$y-[set (yLast)]}]
lifoLabel::push $::messenger [$canvas coords outline] ;# display new coordinates in message area
set canvasWindowManager::handles::(xLast) $x ;### Tcl BUG: should be set ([xy]Last) $... ###
set canvasWindowManager::handles::(yLast) $y
return
}
set width [winfo width $widget::($this,path)]
set height [winfo height $widget::($this,path)]
switch [set ($this,direction)] { ;# resizing
nw - wn {
displayOutline $this [expr {$xFrame+$x}] [expr {$yFrame+$y}] [expr {$width-$x}] [expr {$height-$y}]
}
n {
displayOutline $this $xFrame [expr {$yFrame+$y}] $width [expr {$height-$y}]
}
ne - en {
displayOutline $this $xFrame [expr {$yFrame+$y}] $x [expr {$height-$y}]
}
e {
displayOutline $this $xFrame $yFrame $x $height
}
se - es {
displayOutline $this $xFrame $yFrame $x $y
}
s {
displayOutline $this $xFrame $yFrame $width $y
}
sw - ws {
displayOutline $this [expr {$xFrame+$x}] $yFrame [expr {$width-$x}] $y
}
w {
displayOutline $this [expr {$xFrame+$x}] $yFrame [expr {$width-$x}] $height
}
}
}
proc createOutline {this} {
# create outline borders (a single frame with no background cannot be used for it hides underlying windows)
set canvas [set ($this,canvas)]
foreach side {top bottom left right} {
set frame $widget::([new frame $canvas -background black],path) ;# make sure frame is unique
# items are static because there can be only 1 outline at a time
set ($side,item) [$canvas create window 0 0 -window $frame -width 0 -height 0 -anchor nw -tags outline]
}
positionOutlineInStackingOrder $this lower ;# hide outline for now and make it fit widget
eval displayOutline $this [$canvas coords [set ($this,item)]]\
[winfo width $widget::($this,path)] [winfo height $widget::($this,path)]
}
proc positionOutlineInStackingOrder {this order} { ;# order must be either raise or lower
set canvas [set ($this,canvas)]
foreach side {top bottom left right} {
$order [$canvas itemcget [set ($side,item)] -window]
}
set (hidden) [string compare $order raise]
}
proc displayOutline {this x y width height} { ;# coordinates are relative to canvas
lifoLabel::push $::messenger "$width x $height" ;# display new size in message area
set minimum [expr {(2*$composite::($this,-borderwidth))+1}] ;# make sure managed widget is always visible
set width [maximum $minimum $width]
set height [maximum $minimum $height]
set canvas [set ($this,canvas)]
$canvas coords [set (top,item)] $x $y
$canvas coords [set (bottom,item)] $x [expr {$y+$height-1}]
$canvas coords [set (left,item)] $x $y
$canvas coords [set (right,item)] [expr {$x+$width-1}] $y
$canvas itemconfigure [set (top,item)] -width $width
$canvas itemconfigure [set (bottom,item)] -width $width
$canvas itemconfigure [set (left,item)] -height $height
$canvas itemconfigure [set (right,item)] -height $height
}
proc destroyOutline {this} {
set canvas [set ($this,canvas)]
foreach side {top bottom left right} {
destroy [$canvas itemcget [set ($side,item)] -window] ;# destroy side frame
unset ($side,item)
}
$canvas delete outline ;# delete side items
}
proc updateGeometry {this} { ;# update managed widget position and size according to outline current geometry
set canvas [set ($this,canvas)]
eval $canvas coords [set ($this,item)] [$canvas coords outline]
$canvas itemconfigure [set ($this,item)] -width [$canvas itemcget [set (top,item)] -width]\
-height [$canvas itemcget [set (left,item)] -height]
}
proc getGeometry {this} { ;# return x, y, width and height as a list
set canvas [set ($this,canvas)]
return [concat\
[[set ($this,canvas)] coords [set ($this,item)]]\
[winfo width $widget::($this,path)] [winfo height $widget::($this,path)]\
]
}
}
}
|
