#
# [7Jun2005] TO CHECK: [$tv see {}] -- shouldn't work (at least, shouldn't do
# what it currently does)
#

package require Tk 8.5
package require tcltest ; namespace import -force tcltest::*
loadTestedCommands

# consistencyCheck --
#	Traverse the tree to make sure the item data structures
#	are properly linked.
#
#	Since [$tv children] follows ->next links and [$tv index]
#	follows ->prev links, this should cover all invariants.
#
proc consistencyCheck {tv {item {}}} {
    set i 0;
    foreach child [$tv children $item] {
	assert {[$tv parent $child] == $item} "parent $child = $item"
	assert {[$tv index $child] == $i} "index $child [$tv index $child]=$i"
	incr i
	consistencyCheck $tv $child
    }
}

proc assert {expr {message ""}} {
    if {![uplevel 1 [list expr $expr]]} {
        set error "PANIC! PANIC! PANIC: $message ($expr failed)"
    	puts stderr $error
	error $error
    }
}

test treeview-0 "treeview test - setup" -body {
    ttk::treeview .tv -columns {a b c}
    pack .tv -expand true -fill both
    update
}

test treeview-1.1 "columns" -body {
    .tv configure -columns {a b c}
}

test treeview-1.2 "Bad columns" -body {
    #.tv configure -columns {illegal "list"value}
    ttk::treeview .badtv -columns {illegal "list"value}
} -returnCodes 1 -result "list element in quotes followed by*" -match glob

test treeview-1.3 "bad displaycolumns" -body {
    .tv configure -displaycolumns {a b d}
} -returnCodes 1 -result "Invalid column index d"

test treeview-1.4 "more bad displaycolumns" -body {
    .tv configure -displaycolumns {1 2 3}
} -returnCodes 1 -result "Column index 3 out of bounds"

test treeview-1.5 "Don't forget to check negative numbers" -body {
    .tv configure -displaycolumns {1 -2 3}
} -returnCodes 1 -result "Column index -2 out of bounds"

# Item creation.
#
test treeview-2.1 "insert -- not enough args" -body {
    .tv insert
} -returnCodes 1 -result "wrong # args: *" -match glob

test treeview-2.3 "insert -- bad integer index" -body {
    .tv insert {} badindex
} -returnCodes 1 -result "expected integer *" -match glob

test treeview-2.4 "insert -- bad parent node" -body {
    .tv insert badparent end
} -returnCodes 1 -result "Item badparent not found" -match glob

test treeview-2.5 "insert -- finaly insert a node" -body {
    .tv insert {} end -id newnode -text "New node"
} -result newnode

test treeview-2.6 "insert -- make sure node was inserted" -body {
    .tv children {}
} -result [list newnode]

test treeview-2.7 "insert -- prevent duplicate node names" -body {
    .tv insert {} end -id newnode
} -returnCodes 1 -result "Item newnode already exists"

test treeview-2.8 "insert -- new node at end" -body {
    .tv insert {} end -id lastnode
    consistencyCheck .tv
    .tv children {}
} -result [list newnode lastnode]

consistencyCheck .tv

test treeview-2.9 "insert -- new node at beginning" -body {
    .tv insert {} 0 -id firstnode
    consistencyCheck .tv
    .tv children {}
} -result [list firstnode newnode lastnode]

test treeview-2.10 "insert -- one more node" -body {
    .tv insert {} 2 -id onemore
    consistencyCheck .tv
    .tv children {}
} -result [list firstnode newnode onemore lastnode]

test treeview-2.11 "insert -- and another one" -body {
    .tv insert {} 2 -id anotherone
    consistencyCheck .tv
    .tv children {}
} -result [list firstnode newnode anotherone onemore lastnode]

test treeview-2.12 "insert -- one more at end" -body {
    .tv insert {} end -id newlastone
    consistencyCheck .tv
    .tv children {}
} -result [list firstnode newnode anotherone onemore lastnode newlastone]

test treeview-2.13 "insert -- one more at beginning" -body {
    .tv insert {} 0 -id newfirstone
    consistencyCheck .tv
    .tv children {}
} -result [list newfirstone firstnode newnode anotherone onemore lastnode newlastone]

test treeview-2.14 "insert -- bad options" -body {
    .tv insert {} end -badoption foo
} -returnCodes 1 -result {unknown option "-badoption"}

test treeview-2.15 "insert -- at position 0 w/no children" -body {
    .tv insert newnode 0 -id newnode.n2 -text "Foo"
    .tv children newnode
} -result newnode.n2	;# don't crash

test treeview-2.16 "insert -- insert way past end" -body {
    .tv insert newnode 99 -id newnode.n3 -text "Foo"
    consistencyCheck .tv
    .tv children newnode
} -result [list newnode.n2 newnode.n3]

test treeview-2.17 "insert -- insert before beginning" -body {
    .tv insert newnode -1 -id newnode.n1 -text "Foo"
    consistencyCheck .tv
    .tv children newnode
}  -result [list newnode.n1 newnode.n2 newnode.n3]

###
#
test treeview-3.1 "parent" -body {
    .tv parent newnode.n1
} -result newnode
test treeview-3.2 "parent - top-level node" -body {
    .tv parent newnode
} -result {}
test treeview-3.3 "parent - root node" -body {
    .tv parent {}
} -result {}
test treeview-3.4 "index" -body {
    list [.tv index newnode.n3] [.tv index newnode.n2] [.tv index newnode.n1]
} -result [list 2 1 0]
test treeview-3.5 "index - exhaustive test" -body {
    set result [list]
    foreach item [.tv children {}] {
	lappend result [.tv index $item]
    }
    set result
} -result [list 0 1 2 3 4 5 6]

test treeview-3.6 "detach" -body {
    .tv detach newnode
    consistencyCheck .tv
    .tv children {}
} -result [list newfirstone firstnode anotherone onemore lastnode newlastone]
# XREF: treeview-2.13

test treeview-3.7 "detach didn't screw up internal links" -body {
    consistencyCheck .tv
    set result [list]
    foreach item [.tv children {}] {
	lappend result [.tv index $item]
    }
    set result
} -result [list 0 1 2 3 4 5]

test treeview-3.8 "detached node has no parent, index 0" -body {
    list [.tv parent newnode] [.tv index newnode]
} -result [list {} 0]
# @@@ Can't distinguish detached nodes from first root node

test treeview-3.9 "detached node's children undisturbed" -body {
    .tv children newnode
} -result [list newnode.n1 newnode.n2 newnode.n3]

test treeview-3.10 "detach is idempotent" -body {
    .tv detach newnode
    consistencyCheck .tv
    .tv children {}
} -result [list newfirstone firstnode anotherone onemore lastnode newlastone]

test treeview-3.11 "Can't detach root item" -body {
    .tv detach [list {}]
    update
    consistencyCheck .tv
} -returnCodes 1 -result "Cannot detach root item"
consistencyCheck .tv

test treeview-3.12 "Reattach" -body {
    .tv move newnode {} end
    consistencyCheck .tv
    .tv children {}
} -result [list newfirstone firstnode anotherone onemore lastnode newlastone newnode]

# Bug # ?????
test treeview-3.13 "Re-reattach" -body {
    .tv move newnode {} end
    consistencyCheck .tv
    .tv children {}
} -result [list newfirstone firstnode anotherone onemore lastnode newlastone newnode]

catch {
    .tv insert newfirstone end -id x1
    .tv insert newfirstone end -id x2
    .tv insert newfirstone end -id x3
}

test treeview-3.14 "Duplicated entry in children list" -body {
    .tv children newfirstone [list x3 x1 x2 x3]
    # ??? Maybe this should raise an error?
    consistencyCheck .tv
    .tv children newfirstone
} -result [list x3 x1 x2]

test treeview-3.14.1 "Duplicated entry in children list" -body {
    .tv children newfirstone [list x1 x2 x3 x3 x2 x1]
    consistencyCheck .tv
    .tv children newfirstone
} -result [list x1 x2 x3]

test treeview-3.15 "Consecutive duplicate entries in children list" -body {
    .tv children newfirstone [list x1 x2 x2 x3]
    consistencyCheck .tv
    .tv children newfirstone
} -result [list x1 x2 x3]

test treeview-3.16 "Insert child after self" -body {
    .tv move x2 newfirstone 1
    consistencyCheck .tv
    .tv children newfirstone
} -result [list x1 x2 x3]

test treeview-3.17 "Insert last child after self" -body {
    .tv move x3 newfirstone 2
    consistencyCheck .tv
    .tv children newfirstone
} -result [list x1 x2 x3]

test treeview-3.18 "Insert last child after end" -body {
    .tv move x3 newfirstone 3
    consistencyCheck .tv
    .tv children newfirstone
} -result [list x1 x2 x3]

test treeview-4.1 "opened - initial state" -body {
    .tv item newnode -open
} -result 0
test treeview-4.2 "opened - open node" -body {
    .tv item newnode -open 1
    .tv item newnode -open
} -result 1
test treeview-4.3 "opened - closed node" -body {
    .tv item newnode -open 0
    .tv item newnode -open
} -result 0

test treeview-5.1 "item -- error checks" -body {
    .tv item newnode -text "Bad values" -values "{bad}list"
} -returnCodes 1 -result "list element in braces followed by*" -match glob

test treeview-5.2 "item -- error leaves options unchanged " -body {
    .tv item newnode -text
} -result "New node"

test treeview-5.3 "Heading" -body {
    .tv heading #0 -text "Heading"
}

test treeview-5.4 "get cell" -body {
    set l [list a b c]
    .tv item newnode -values $l
    .tv set newnode 1
} -result b

test treeview-5.5 "set cell" -body {
    .tv set newnode 1 XXX
    .tv item newnode -values
} -result [list a XXX c]

test treeview-5.6 "set illegal cell" -body {
    .tv set newnode #0 YYY
} -returnCodes 1 -result "Display column #0 cannot be set"

test treeview-5.7 "set illegal cell" -body {
    .tv set newnode 3 YY	;# 3 == current #columns
} -returnCodes 1 -result "Column index 3 out of bounds"

test treeview-5.8 "set display columns" -body {
    .tv configure -displaycolumns [list 2 1 0]
    .tv set newnode #1 X
    .tv set newnode #2 Y
    .tv set newnode #3 Z
    .tv item newnode -values
} -result [list Z Y X]

test treeview-5.9 "display columns part 2" -body {
    list [.tv column #1 -id] [.tv column #2 -id] [.tv column #3 -id]
} -result [list c b a]

test treeview-5.10 "cannot set column -id" -body {
    .tv column #1 -id X
} -returnCodes 1 -result "Attempt to change read-only option"

test treeview-5.11 "get" -body {
    .tv set newnode #1
} -result X

test treeview-5.12 "get dictionary" -body {
    .tv set newnode
} -result [list a Z b Y c X]

test treeview-5.13 "get, no value" -body {
    set newitem [.tv insert {} end]
    set result [.tv set $newitem #1]
    .tv delete $newitem
    set result
} -result {}


test treeview-6.1 "deletion - setup" -body {
    .tv insert {} end -id dtest
    foreach id [list a b c d e] {
	.tv insert dtest end -id $id
    }
    .tv children dtest
} -result [list a b c d e]

test treeview-6.1.1 "delete" -body {
    .tv delete b
    consistencyCheck .tv
    list [.tv exists b] [.tv children dtest]
} -result [list 0 [list a c d e]]

consistencyCheck .tv

test treeview-6.2 "delete - duplicate items in list" -body {
    .tv delete [list a e a e]
    consistencyCheck .tv
    .tv children dtest
} -result [list c d]

test treeview-6.3 "delete - descendants removed" -body {
    .tv insert c  end -id c1
    .tv insert c  end -id c2
    .tv insert c1 end -id c11
    consistencyCheck .tv
    .tv delete c
    consistencyCheck .tv
    list [.tv exists c] [.tv exists c1] [.tv exists c2] [.tv exists c11]
} -result [list 0 0 0 0]

test treeview-6.4 "delete - delete parent and descendants" -body {
    .tv insert dtest end -id c
    .tv insert c  end -id c1
    .tv insert c  end -id c2
    .tv insert c1 end -id c11
    consistencyCheck .tv
    .tv delete [list c c1 c2 c11]
    consistencyCheck .tv
    list [.tv exists c] [.tv exists c1] [.tv exists c2] [.tv exists c11]
} -result [list 0 0 0 0]

test treeview-6.5 "delete - delete descendants and parent" -body {
    .tv insert dtest end -id c
    .tv insert c  end -id c1
    .tv insert c  end -id c2
    .tv insert c1 end -id c11
    consistencyCheck .tv
    .tv delete [list c11 c1 c2 c]
    consistencyCheck .tv
    list [.tv exists c] [.tv exists c1] [.tv exists c2] [.tv exists c11]
} -result [list 0 0 0 0]

test treeview-6.6 "delete - end" -body {
    consistencyCheck .tv
    .tv children dtest
} -result [list d]

test treeview-7.1 "move" -body {
    .tv insert d end -id d1
    .tv insert d end -id d2
    .tv insert d end -id d3
    .tv move d3 d 0
    consistencyCheck .tv
    .tv children d
} -result [list d3 d1 d2]

test treeview-7.2 "illegal move" -body {
   .tv move d d2 end
} -returnCodes 1 -result "Cannot insert d as descendant of d2"

test treeview-7.3 "illegal move has no effect" -body {
    consistencyCheck .tv
    .tv children d
} -result [list d3 d1 d2]

test treeview-7.4 "Replace children" -body {
    .tv children d [list d3 d2 d1]
    consistencyCheck .tv
    .tv children d
} -result [list d3 d2 d1]

test treeview-7.5 "replace children - precondition" -body {
    # Just check to make sure the test suite so far has left
    # us in the state we expect to be in:
    list [.tv parent newnode] [.tv children newnode]
} -result [list {} [list newnode.n1 newnode.n2 newnode.n3]]

test treeview-7.6 "Replace children - illegal move" -body {
    .tv children newnode.n1 [list newnode.n1 newnode.n2 newnode.n3]
} -returnCodes 1 -result "Cannot insert newnode.n1 as descendant of newnode.n1"

consistencyCheck .tv

test treeview-8.0 "Selection set" -body {
    .tv selection set [list newnode.n1 newnode.n3 newnode.n2]
    .tv selection
} -result [list newnode.n1 newnode.n2 newnode.n3]

test treeview-8.1 "Selection add" -body {
    .tv selection add [list newnode]
    .tv selection
} -result [list newnode newnode.n1 newnode.n2 newnode.n3]

test treeview-8.2 "Selection toggle" -body {
    .tv selection toggle [list newnode.n2 d3]
    .tv selection
} -result [list newnode newnode.n1 newnode.n3 d3]

test treeview-8.3 "Selection remove" -body {
    .tv selection remove [list newnode.n2 d3]
    .tv selection
} -result [list newnode newnode.n1 newnode.n3]

test treeview-8.4 "Selection - clear" -body {
    .tv selection set {}
    .tv selection
} -result {}

test treeview-8.5 "Selection - bad operation" -body {
    .tv selection badop foo
} -returnCodes 1 -match glob -result {bad selection operation "badop": must be *}

test treeview-8.6 "Selection - <<TreeviewSelect>> on selection add" -body {
    .tv selection set {}
    bind .tv <<TreeviewSelect>> {set res 1}
    set res 0
    .tv selection add newnode.n1
    update
    set res
} -result {1}

test treeview-8.7 "<<TreeviewSelect>> on selected item deletion" -body {
    .tv selection set {}
    .tv insert "" end -id selectedDoomed -text DeadItem
    .tv insert "" end -id doomed -text AlsoDead
    .tv selection add selectedDoomed
    update
    bind .tv <<TreeviewSelect>> {lappend res 1}
    set res 0
    .tv delete doomed
    update
    set res [expr {$res == 0}]
    .tv delete selectedDoomed
    update
    set res
} -result {1 1}

### NEED: more tests for see/yview/scrolling

proc scrollcallback {args} {
    set ::scrolldata $args
}
test treeview-9.0 "scroll callback - empty tree" -body {
    .tv configure -yscrollcommand scrollcallback
    .tv delete [.tv children {}]
    update
    set ::scrolldata
} -result [list 0.0 1.0]

test treeview-9.1 "scrolling" -setup {
    pack [ttk::treeview .tree -show tree] -fill y
    for {set i 1} {$i < 100} {incr i} {
        .tree insert {} end -text $i
    }
} -body {
    .tree yview scroll 5 units
    .tree identify item 2 2
} -cleanup {
    destroy .tree
} -result {I006}

test treeview-9.2 {scrolling on see command - bug [14188104c3]} -setup {
    toplevel .top
    ttk::treeview .top.tree -show {} -height 10 -columns {label} \
            -yscrollcommand [list .top.vs set]
    ttk::scrollbar .top.vs -command {.top.tree yview}
    grid .top.tree -row 0 -column 0 -sticky ns
    grid .top.vs -row 0 -column 1 -sticky ns
    update
    proc setrows {n} {
        .top.tree delete [.top.tree children {}]
        for {set i 1} {$i <= $n} {incr i} {
            .top.tree insert {} end -id row$i \
                    -values [list [format "Row %2.2d" $i]]
        }
        .top.tree see row1
        update idletasks
    }
} -body {
    setrows 10
    set res [.top.vs get]
    setrows 20
    lappend res [expr [lindex [.top.vs get] 1] < 1]
} -cleanup {
    destroy .top
} -result {0.0 1.0 1}

test treeview-9.3 {scrolling on see command, requested item is closed} -setup {
    toplevel .top
    ttk::treeview .top.tree -show tree -height 10 -columns {label} \
            -yscrollcommand [list .top.vs set]
    ttk::scrollbar .top.vs -command {.top.tree yview}
    grid .top.tree -row 0 -column 0 -sticky ns
    grid .top.vs -row 0 -column 1 -sticky ns

    .top.tree insert {} end -id a -text a
    .top.tree insert a  end -id b -text b
    .top.tree insert b  end -id c -text c
    .top.tree insert c  end -id d -text d
    .top.tree insert d  end -id e -text e
    for {set i 6} {$i <= 15} {incr i} {
        .top.tree insert {} end -id row$i \
                -values [list [format "Row %2.2d" $i]]
    }
    update
} -body {
    set before [lindex [.top.vs get] 1]
    .top.tree see e
    update idletasks
    set after [lindex [.top.vs get] 1]
    expr $after < $before
} -cleanup {
    destroy .top
} -result {1}

### identify tests:
#
proc identify* {tv comps args} {
    foreach {x y} $args {
	foreach comp $comps {
	    lappend result [$tv identify $comp $x $y]
	}
    }
    return $result
}

# get list of column IDs from list of display column ids.
#
proc columnids {tv dcols} {
    set result [list]
    foreach dcol $dcols {
	if {[catch {
	    lappend result [$tv column $dcol -id]
	}]} {
	    lappend result ERROR
	}
    }
    return $result
}

test treeview-identify-setup "identify series - setup" -body {
    destroy .tv
    ttk::setTheme default
    ttk::treeview .tv -columns [list A B C]
    .tv insert {} end -id branch -text branch -open true
    .tv insert branch end -id item1 -text item1
    .tv insert branch end -id item2 -text item2
    .tv insert branch end -id item3 -text item3

    .tv column #0 -width 50	;# 0-50
    .tv column A -width 50	;# 50-100
    .tv column B -width 50	;# 100-150
    .tv column C -width 50	;# 150-200 (plus slop for margins)

    wm geometry . {} ; pack .tv ; update
}

test treeview-identify-1 "identify heading" -body {
    .tv configure -show {headings tree}
    update idletasks
    identify* .tv {region column} 10 10
} -result [list heading #0]

test treeview-identify-2 "identify columns" -body {
    .tv configure -displaycolumns #all
    update idletasks
    columnids .tv [identify* .tv column 25 10  75 10  125 10  175 10]
} -result [list {} A B C]

test treeview-identify-3 "reordered columns" -body {
    .tv configure -displaycolumns {B A C}
    update idletasks
    columnids .tv [identify* .tv column 25 10  75 10  125 10  175 10]
} -result [list {} B A C]

test treeview-identify-4 "no tree column" -body {
    .tv configure -displaycolumns #all -show {headings}
    update idletasks
    identify* .tv {region column} 25 10  75 10  125 10  175 10
} -result [list heading #1 heading #2 heading #3 nothing {}]

# Item height in default theme is 20px
test treeview-identify-5 "vertical scan - no headings" -body {
    .tv configure -displaycolumns #all -show {tree}
    update idletasks
    identify* .tv {region item} 25 10  25 30  25 50  25 70  25 90
} -result [list tree branch tree item1 tree item2 tree item3 nothing {}]

test treeview-identify-6 "vertical scan - with headings" -body {
    .tv configure -displaycolumns #all -show {tree headings}
    update idletasks
    identify* .tv {region item} 25 10  25 30  25 50  25 70  25 90
} -result [list heading {} tree branch tree item1 tree item2 tree item3]

test treeview-identify-7 "vertical scan - headings, no tree" -body {
    .tv configure -displaycolumns #all -show {headings}
    update idletasks
    identify* .tv {region item} 25 10  25 30  25 50  25 70  25 90
} -result [list heading {} cell branch cell item1 cell item2 cell item3]

# In default theme, -indent and -itemheight both 20px
# Disclosure element name is "Treeitem.indicator"
set disclosure "*.indicator"
test treeview-identify-8 "identify element" -body {
    .tv configure -show {tree}
    .tv insert branch  0 -id branch2 -open true
    .tv insert branch2 0 -id branch3 -open true
    .tv insert branch3 0 -id leaf3
    update idletasks;
    identify* .tv {item element} 10 10  30 30  50 50
} -match glob -result [list \
	branch $disclosure branch2 $disclosure branch3 $disclosure]

# See #2381555
test treeview-identify-9 "identify works when horizontally scrolled" -setup {
    .tv configure -show {tree headings}
    foreach column {#0 A B C} {
	.tv column $column -stretch 0 -width 50
    }
    place .tv -x 0 -y 0 -width 100
} -body {
    set result [list]
    foreach xoffs {0 50 100} {
	.tv xview $xoffs ; update
	lappend result [identify* .tv {region column} 10 10 60 10]
    }
    set result
} -result [list \
	[list heading #0 heading #1] \
	[list heading #1 heading #2] \
	[list heading #2 heading #3] ]

test treeview-identify-cleanup "identify - cleanup" -body {
    destroy .tv
}

### NEED: tests for focus item, selection

### Misc. tests:

destroy .tv
test treeview-10.1 "Root node properly initialized (#1541739)" -setup {
    ttk::treeview .tv
    .tv insert {} end -id a
    .tv see a
} -cleanup {
    destroy .tv
}

test treeview-3006842 "Null bindings" -setup {
    ttk::treeview .tv -show tree
} -body {
    .tv tag bind empty <ButtonPress-1> {}
    .tv insert {} end -text "Click me" -tags empty
    event generate .tv <ButtonPress-1> -x 10 -y 10
    .tv tag bind empty
} -result {} -cleanup {
    destroy .tv
}

test treeview-3085489-1 "tag add, no -tags" -setup {
    ttk::treeview .tv
} -body {
    set item [.tv insert {} end]
    .tv tag add foo $item
    .tv item $item -tags
} -cleanup {
    destroy .tv
} -result [list foo]

test treeview-3085489-2 "tag remove, no -tags" -setup {
    ttk::treeview .tv
} -body {
    set item [.tv insert {} end]
    .tv tag remove foo $item
    .tv item $item -tags
} -cleanup {
    destroy .tv
} -result [list]

test treeview-368fa4561e "indicators cannot be clicked on leafs" -setup {
    pack [ttk::treeview .tv]
    .tv insert {} end -id foo -text "<-- (1) Click the blank space to my left" 
    update
} -body {
    foreach {x y w h} [.tv bbox foo #0] {}
    set res [.tv item foo -open]
    # using $h even for x computation is intentional here in order to simulate
    # a mouse click on the (invisible since we're on a leaf) indicator
    event generate .tv <ButtonPress-1> \
            -x [expr {$x + $h / 2}] \
            -y [expr {$y + $h / 2}]
    lappend res [.tv item foo -open]
    .tv insert foo end -text "sub"
    lappend res [.tv item foo -open]
} -cleanup {
    destroy .tv
} -result {0 0 0}

test treeview-ce470f20fd-1 "dragging further than the right edge of the treeview is allowed" -setup {
    pack [ttk::treeview .tv]
    .tv heading #0 -text "Drag my right edge -->" 
    update
} -body {
    set res [.tv column #0 -width]
    .tv drag #0 400
    lappend res [expr {[.tv column #0 -width] > $res}]
} -cleanup {
    destroy .tv
} -result {200 1}

proc nostretch {tv} {
    foreach col [$tv cget -columns] {
        $tv column $col -stretch 0
    }
    $tv column #0 -stretch 0
    update idletasks ; # redisplay $tv
}

test treeview-ce470f20fd-2 "changing -stretch resizes columns" -setup {
    pack [ttk::treeview .tv -columns {bar colA colB colC foo}]
    foreach col [.tv cget -columns] {
        .tv heading $col -text $col
    }
    nostretch .tv
    .tv column colA -width 50 ; .tv column colB -width 50 ; # slack created
    update idletasks ; # redisplay treeview
} -body {
    # when no column is stretchable and one of them becomes stretchable
    # the stretchable column takes the slack and the widget is redisplayed
    # automatically at idle time
    set res [.tv column colA -width]
    .tv column colA -stretch 1
    update idletasks ; # no slack anymore, widget redisplayed
    lappend res [expr {[.tv column colA -width] > $res}]
} -cleanup {
    destroy .tv
} -result {50 1}

test treeview-ce470f20fd-3 "changing -stretch resizes columns" -setup {
    pack [ttk::treeview .tv -columns {bar colA colB colC foo}]
    foreach col [.tv cget -columns] {
        .tv heading $col -text $col
    }
    .tv configure -displaycolumns {colB colA colC}
    nostretch .tv
    .tv column colA -width 50 ; .tv column colB -width 50 ; # slack created
    update idletasks ; # redisplay treeview
} -body {
    # only some columns are displayed (and in a different order than declared
    # in -columns), a displayed column becomes stretchable  --> the stretchable
    # column expands
    set res [.tv column colA -width]
    .tv column colA -stretch 1
    update idletasks ; # no slack anymore, widget redisplayed
    lappend res [expr {[.tv column colA -width] > $res}]
} -cleanup {
    destroy .tv
} -result {50 1}

test treeview-ce470f20fd-4 "changing -stretch resizes columns" -setup {
    pack [ttk::treeview .tv -columns {bar colA colB colC foo}]
    foreach col [.tv cget -columns] {
        .tv heading $col -text $col
    }
    .tv configure -displaycolumns {colB colA colC}
    nostretch .tv
    .tv column colA -width 50 ; .tv column bar -width 60 ; # slack created
    update idletasks ; # redisplay treeview
} -body {
    # only some columns are displayed (and in a different order than declared
    # in -columns), a non-displayed column becomes stretchable  --> nothing 
    # happens
    set origTreeWidth [winfo width .tv]
    set res [list [.tv column bar -width] [.tv column colA -width]]
    .tv column bar -stretch 1
    update idletasks ; # no change, widget redisplayed
    lappend res [.tv column bar -width] [.tv column colA -width]
    # this column becomes visible  --> widget resizes
    .tv configure -displaycolumns {bar colC colA colB}
    update idletasks ; # no slack anymore because the widget resizes (shrinks)
    lappend res [.tv column bar -width] [.tv column colA -width] \
                [expr {[winfo width .tv] < $origTreeWidth}]
} -cleanup {
    destroy .tv
} -result {60 50 60 50 60 50 1}

tcltest::cleanupTests