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#
# ttk::treeview widget bindings and utilities.
#
namespace eval ttk::treeview {
variable State
# Enter/Leave/Motion
#
set State(activeWidget) {}
set State(activeHeading) {}
# Press/drag/release:
#
set State(pressMode) none
set State(pressX) 0
# For pressMode == "resize"
set State(resizeColumn) #0
# For pressmode == "heading"
set State(heading) {}
}
### Widget bindings.
#
bind Treeview <Motion> { ttk::treeview::Motion %W %x %y }
bind Treeview <B1-Leave> { #nothing }
bind Treeview <Leave> { ttk::treeview::ActivateHeading {} {}}
bind Treeview <ButtonPress-1> { ttk::treeview::Press %W %x %y }
bind Treeview <Double-ButtonPress-1> { ttk::treeview::DoubleClick %W %x %y }
bind Treeview <ButtonRelease-1> { ttk::treeview::Release %W %x %y }
bind Treeview <B1-Motion> { ttk::treeview::Drag %W %x %y }
bind Treeview <KeyPress-Up> { ttk::treeview::Keynav %W up }
bind Treeview <KeyPress-Down> { ttk::treeview::Keynav %W down }
bind Treeview <KeyPress-Right> { ttk::treeview::Keynav %W right }
bind Treeview <KeyPress-Left> { ttk::treeview::Keynav %W left }
bind Treeview <KeyPress-Prior> { %W yview scroll -1 pages }
bind Treeview <KeyPress-Next> { %W yview scroll 1 pages }
bind Treeview <KeyPress-Return> { ttk::treeview::ToggleFocus %W }
bind Treeview <KeyPress-space> { ttk::treeview::ToggleFocus %W }
bind Treeview <Shift-ButtonPress-1> \
{ ttk::treeview::Select %W %x %y extend }
bind Treeview <<ToggleSelection>> \
{ ttk::treeview::Select %W %x %y toggle }
ttk::copyBindings TtkScrollable Treeview
### Binding procedures.
#
## Keynav -- Keyboard navigation
#
# @@@ TODO: verify/rewrite up and down code.
#
proc ttk::treeview::Keynav {w dir} {
set focus [$w focus]
if {$focus eq ""} { return }
switch -- $dir {
up {
if {[set up [$w prev $focus]] eq ""} {
set focus [$w parent $focus]
} else {
while {[$w item $up -open] && [llength [$w children $up]]} {
set up [lindex [$w children $up] end]
}
set focus $up
}
}
down {
if {[$w item $focus -open] && [llength [$w children $focus]]} {
set focus [lindex [$w children $focus] 0]
} else {
set up $focus
while {$up ne "" && [set down [$w next $up]] eq ""} {
set up [$w parent $up]
}
set focus $down
}
}
left {
if {[$w item $focus -open] && [llength [$w children $focus]]} {
CloseItem $w $focus
} else {
set focus [$w parent $focus]
}
}
right {
OpenItem $w $focus
}
}
if {$focus != {}} {
SelectOp $w $focus choose
}
}
## Motion -- pointer motion binding.
# Sets cursor, active element ...
#
proc ttk::treeview::Motion {w x y} {
set cursor {}
set activeHeading {}
switch -- [$w identify region $x $y] {
separator { set cursor hresize }
heading { set activeHeading [$w identify column $x $y] }
}
ttk::setCursor $w $cursor
ActivateHeading $w $activeHeading
}
## ActivateHeading -- track active heading element
#
proc ttk::treeview::ActivateHeading {w heading} {
variable State
if {$w != $State(activeWidget) || $heading != $State(activeHeading)} {
if {[winfo exists $State(activeWidget)] && $State(activeHeading) != {}} {
# It may happen that $State(activeHeading) no longer corresponds
# to an existing display column. This happens for instance when
# changing -displaycolumns in a bound script when this change
# triggers a <Leave> event. A proc checking if the display column
# $State(activeHeading) is really still present or not could be
# written but it would need to check several special cases:
# a. -displaycolumns "#all" or being an explicit columns list
# b. column #0 display is not governed by the -displaycolumn
# list but by the value of the -show option
# --> Let's rather catch the following line.
catch {$State(activeWidget) heading $State(activeHeading) state !active}
}
if {$heading != {}} {
$w heading $heading state active
}
set State(activeHeading) $heading
set State(activeWidget) $w
}
}
## Select $w $x $y $selectop
# Binding procedure for selection operations.
# See "Selection modes", below.
#
proc ttk::treeview::Select {w x y op} {
if {[set item [$w identify row $x $y]] ne "" } {
SelectOp $w $item $op
}
}
## DoubleClick -- Double-ButtonPress-1 binding.
#
proc ttk::treeview::DoubleClick {w x y} {
if {[set row [$w identify row $x $y]] ne ""} {
Toggle $w $row
} else {
Press $w $x $y ;# perform single-click action
}
}
## Press -- ButtonPress binding.
#
proc ttk::treeview::Press {w x y} {
focus $w
switch -- [$w identify region $x $y] {
nothing { }
heading { heading.press $w $x $y }
separator { resize.press $w $x $y }
tree -
cell {
set item [$w identify item $x $y]
SelectOp $w $item choose
switch -glob -- [$w identify element $x $y] {
*indicator -
*disclosure { Toggle $w $item }
}
}
}
}
## Drag -- B1-Motion binding
#
proc ttk::treeview::Drag {w x y} {
variable State
switch $State(pressMode) {
resize { resize.drag $w $x }
heading { heading.drag $w $x $y }
}
}
proc ttk::treeview::Release {w x y} {
variable State
switch $State(pressMode) {
resize { resize.release $w $x }
heading { heading.release $w }
}
set State(pressMode) none
Motion $w $x $y
}
### Interactive column resizing.
#
proc ttk::treeview::resize.press {w x y} {
variable State
set State(pressMode) "resize"
set State(resizeColumn) [$w identify column $x $y]
}
proc ttk::treeview::resize.drag {w x} {
variable State
$w drag $State(resizeColumn) $x
}
proc ttk::treeview::resize.release {w x} {
$w drop
}
### Heading activation.
#
proc ttk::treeview::heading.press {w x y} {
variable State
set column [$w identify column $x $y]
set State(pressMode) "heading"
set State(heading) $column
$w heading $column state pressed
}
proc ttk::treeview::heading.drag {w x y} {
variable State
if { [$w identify region $x $y] eq "heading"
&& [$w identify column $x $y] eq $State(heading)
} {
$w heading $State(heading) state pressed
} else {
$w heading $State(heading) state !pressed
}
}
proc ttk::treeview::heading.release {w} {
variable State
if {[lsearch -exact [$w heading $State(heading) state] pressed] >= 0} {
after 0 [$w heading $State(heading) -command]
}
$w heading $State(heading) state !pressed
}
### Selection modes.
#
## SelectOp $w $item [ choose | extend | toggle ] --
# Dispatch to appropriate selection operation
# depending on current value of -selectmode.
#
proc ttk::treeview::SelectOp {w item op} {
select.$op.[$w cget -selectmode] $w $item
}
## -selectmode none:
#
proc ttk::treeview::select.choose.none {w item} { $w focus $item }
proc ttk::treeview::select.toggle.none {w item} { $w focus $item }
proc ttk::treeview::select.extend.none {w item} { $w focus $item }
## -selectmode browse:
#
proc ttk::treeview::select.choose.browse {w item} { BrowseTo $w $item }
proc ttk::treeview::select.toggle.browse {w item} { BrowseTo $w $item }
proc ttk::treeview::select.extend.browse {w item} { BrowseTo $w $item }
## -selectmode multiple:
#
proc ttk::treeview::select.choose.extended {w item} {
BrowseTo $w $item
}
proc ttk::treeview::select.toggle.extended {w item} {
$w selection toggle [list $item]
}
proc ttk::treeview::select.extend.extended {w item} {
if {[set anchor [$w focus]] ne ""} {
$w selection set [between $w $anchor $item]
} else {
BrowseTo $w $item
}
}
### Tree structure utilities.
#
## between $tv $item1 $item2 --
# Returns a list of all items between $item1 and $item2,
# in preorder traversal order. $item1 and $item2 may be
# in either order.
#
# NOTES:
# This routine is O(N) in the size of the tree.
# There's probably a way to do this that's O(N) in the number
# of items returned, but I'm not clever enough to figure it out.
#
proc ttk::treeview::between {tv item1 item2} {
variable between [list]
variable selectingBetween 0
ScanBetween $tv $item1 $item2 {}
return $between
}
## ScanBetween --
# Recursive worker routine for ttk::treeview::between
#
proc ttk::treeview::ScanBetween {tv item1 item2 item} {
variable between
variable selectingBetween
if {$item eq $item1 || $item eq $item2} {
lappend between $item
set selectingBetween [expr {!$selectingBetween}]
} elseif {$selectingBetween} {
lappend between $item
}
foreach child [$tv children $item] {
ScanBetween $tv $item1 $item2 $child
}
}
### User interaction utilities.
#
## OpenItem, CloseItem -- Set the open state of an item, generate event
#
proc ttk::treeview::OpenItem {w item} {
$w focus $item
event generate $w <<TreeviewOpen>>
$w item $item -open true
}
proc ttk::treeview::CloseItem {w item} {
$w item $item -open false
$w focus $item
event generate $w <<TreeviewClose>>
}
## Toggle -- toggle opened/closed state of item
#
proc ttk::treeview::Toggle {w item} {
# don't allow toggling on indicators that
# are not present in front of leaf items
if {[$w children $item] == {}} {
return
}
# not a leaf, toggle!
if {[$w item $item -open]} {
CloseItem $w $item
} else {
OpenItem $w $item
}
}
## ToggleFocus -- toggle opened/closed state of focus item
#
proc ttk::treeview::ToggleFocus {w} {
set item [$w focus]
if {$item ne ""} {
Toggle $w $item
}
}
## BrowseTo -- navigate to specified item; set focus and selection
#
proc ttk::treeview::BrowseTo {w item} {
$w see $item
$w focus $item
$w selection set [list $item]
}
#*EOF*
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