listbox.tcl

Linux下的MSN聊天程序源码

#  Command ListBox::itemcget
# ----------------------------------------------------------------------------
proc ListBox::itemcget { path item option } {
    return [Widget::cget $path.$item $option]
}


# ----------------------------------------------------------------------------
#  Command ListBox::bindText
# ----------------------------------------------------------------------------
proc ListBox::bindText { path event script } {
    if { $script != "" } {
        set map [list %W $path]
        set script [string map $map $script]
        $path.c bind "click" $event "$script \[ListBox::_get_current $path]"
    } else {
        $path.c bind "click" $event {}
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::bindImage
# ----------------------------------------------------------------------------
proc ListBox::bindImage { path event script } {
    if { $script != "" } {
        set map [list %W $path]
        set script [string map $map $script]
        $path.c bind "img" $event "$script \[ListBox::_get_current $path]"
    } else {
        $path.c bind "img" $event {}
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::delete
# ----------------------------------------------------------------------------
proc ListBox::delete { path args } {
    variable $path
    upvar 0  $path data

    foreach litems $args {
        foreach item $litems {
            set idx [lsearch -exact $data(items) $item]
            if { $idx != -1 } {
                set data(items) [lreplace $data(items) $idx $idx]
                Widget::destroy $path.$item
                if { [info exists data(upd,create,$item)] } {
                    unset data(upd,create,$item)
                } else {
                    lappend data(upd,delete) $item
                }
            }
        }
    }

    set sel $data(selitems)
    set data(selitems) {}
    eval [list selection $path set] $sel
    _redraw_idle $path 2
}


# ----------------------------------------------------------------------------
#  Command ListBox::move
# ----------------------------------------------------------------------------
proc ListBox::move { path item index } {
    variable $path
    upvar 0  $path data

    if { [set idx [lsearch -exact $data(items) $item]] == -1 } {
        return -code error "item \"$item\" does not exist"
    }

    set data(items) [linsert [lreplace $data(items) $idx $idx] $index $item]

    _redraw_idle $path 2
}


# ----------------------------------------------------------------------------
#  Command ListBox::reorder
# ----------------------------------------------------------------------------
proc ListBox::reorder { path neworder } {
    variable $path
    upvar 0  $path data

    set data(items) [BWidget::lreorder $data(items) $neworder]
    _redraw_idle $path 2
}


# ----------------------------------------------------------------------------
#  Command ListBox::selection
# ----------------------------------------------------------------------------
proc ListBox::selection { path cmd args } {
    variable $path
    upvar 0  $path data

    switch -- $cmd {
        set {
            set data(selitems) {}
            foreach item $args {
                if { [lsearch -exact $data(selitems) $item] == -1 } {
                    if { [lsearch -exact $data(items) $item] != -1 } {
                        lappend data(selitems) $item
                    }
                }
            }
        }
        add {
            foreach item $args {
                if { [lsearch -exact $data(selitems) $item] == -1 } {
                    if { [lsearch -exact $data(items) $item] != -1 } {
                        lappend data(selitems) $item
                    }
                }
            }
        }
        remove {
            foreach item $args {
                if { [set idx [lsearch -exact $data(selitems) $item]] != -1 } {
                    set data(selitems) [lreplace $data(selitems) $idx $idx]
                }
            }
        }
        clear {
            set data(selitems) {}
        }
        get {
            return $data(selitems)
        }
        includes {
            return [expr {[lsearch -exact $data(selitems) $args] != -1}]
        }
        default {
            return
        }
    }

    _redraw_idle $path 1
}


# ----------------------------------------------------------------------------
#  Command ListBox::exists
# ----------------------------------------------------------------------------
proc ListBox::exists { path item } {
    variable $path
    upvar 0  $path data

    return [expr {[lsearch -exact $data(items) $item] != -1}]
}


# ----------------------------------------------------------------------------
#  Command ListBox::index
# ----------------------------------------------------------------------------
proc ListBox::index { path item } {
    variable $path
    upvar 0  $path data
    if {[string equal $item "active"]} { return [$path selection get] }
    return [lsearch -exact $data(items) $item]
}


# ----------------------------------------------------------------------------
#  ListBox::find
#     Returns the item given a position.
#  findInfo     @x,y ?confine?
#               lineNumber
# ----------------------------------------------------------------------------
proc ListBox::find {path findInfo {confine ""}} {
    variable $path
    upvar 0  $path widgetData

    if {[regexp -- {^@([0-9]+),([0-9]+)$} $findInfo match x y]} {
        set x [$path.c canvasx $x]
        set y [$path.c canvasy $y]
    } elseif {[regexp -- {^[0-9]+$} $findInfo lineNumber]} {
        set dy [Widget::getoption $path -deltay]
        set y  [expr {$dy*($lineNumber+0.5)}]
        set confine ""
    } else {
        return -code error "invalid find spec \"$findInfo\""
    }

    set found 0
    set xi    0
    foreach xs $widgetData(xlist) {
        if {$x <= $xs} {
            foreach id [$path.c find overlapping $xi $y $xs $y] {
                set ltags [$path.c gettags $id]
                set item  [lindex $ltags 0]
                if { [string equal $item "item"] ||
                     [string equal $item "img"]  ||
                     [string equal $item "win"] } {
                    # item is the label or image/window of the node
                    set item [string range [lindex $ltags 1] 2 end]
                    set found 1
                    break
                }
            }
            break
        }
        set  xi  $xs
    }

    if {$found} {
        if {[string equal $confine "confine"]} {
            # test if x stand inside node bbox
            set xi [expr {[lindex [$path.c coords n:$item] 0]-[Widget::getoption $path -padx]}]
            set xs [lindex [$path.c bbox n:$item] 2]
            if {$x >= $xi && $x <= $xs} {
                return $item
            }
        } else {
            return $item
        }
    }
    return ""
}


# ----------------------------------------------------------------------------
#  Command ListBox::item - deprecated
# ----------------------------------------------------------------------------
proc ListBox::item { path first {last ""} } {
    variable $path
    upvar 0  $path data

    if { ![string length $last] } {
        return [lindex $data(items) $first]
    } else {
        return [lrange $data(items) $first $last]
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::items
# ----------------------------------------------------------------------------
proc ListBox::items { path {first ""} {last ""}} {
    variable $path
    upvar 0  $path data

    if { ![string length $first] } {
	return $data(items)
    }

    if { ![string length $last] } {
        return [lindex $data(items) $first]
    } else {
        return [lrange $data(items) $first $last]
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::see
# ----------------------------------------------------------------------------
proc ListBox::see { path item } {
    variable $path
    upvar 0  $path data

    if { [Widget::getoption $path -redraw] && $data(upd,afterid) != "" } {
        after cancel $data(upd,afterid)
        _redraw_listbox $path
    }
    set idn [$path.c find withtag n:$item]
    if { $idn != "" } {
        ListBox::_see $path $idn right
        ListBox::_see $path $idn left
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::edit
# ----------------------------------------------------------------------------
proc ListBox::edit { path item text {verifycmd ""} {clickres 0} {select 1}} {
    variable _edit
    variable $path
    upvar 0  $path data

    if { [Widget::getoption $path -redraw] && $data(upd,afterid) != "" } {
        after cancel $data(upd,afterid)
        _redraw_listbox $path
    }
    set idn [$path.c find withtag n:$item]
    if { $idn != "" } {
        ListBox::_see $path $idn right
        ListBox::_see $path $idn left

        set oldfg  [$path.c itemcget $idn -fill]
        set sbg    [Widget::getoption $path -selectbackground]
        set coords [$path.c coords $idn]
        set x      [lindex $coords 0]
        set y      [lindex $coords 1]
        set bd     [expr {[$path.c cget -borderwidth]+[$path.c cget -highlightthickness]}]
        set w      [expr {[winfo width $path] - 2*$bd}]
        set wmax   [expr {[$path.c canvasx $w]-$x}]

	$path.c itemconfigure $idn    -fill [Widget::getoption $path -background]
        $path.c itemconfigure s:$item -fill {} -outline {}

        set _edit(text) $text
        set _edit(wait) 0

        set frame  [frame $path.edit \
                        -relief flat -borderwidth 0 -highlightthickness 0 \
                        -background [Widget::getoption $path -background]]
        set ent    [entry $frame.edit \
                        -width              0     \
                        -relief             solid \
                        -borderwidth        1     \
                        -highlightthickness 0     \
                        -foreground         [_getoption $path $item -foreground] \
                        -background         [Widget::getoption $path -background] \
                        -selectforeground   [Widget::getoption $path -selectforeground] \
                        -selectbackground   $sbg  \
                        -font               [_getoption $path $item -font] \
                        -textvariable       ListBox::_edit(text)]
        pack $ent -ipadx 8 -anchor w

        set idw [$path.c create window $x $y -window $frame -anchor w]
        trace variable ListBox::_edit(text) w [list ListBox::_update_edit_size $path $ent $idw $wmax]
        tkwait visibility $ent
        grab  $frame
        BWidget::focus set $ent
        _update_edit_size $path $ent $idw $wmax
        update
        if { $select } {
            $ent selection range 0 end
            $ent icursor end
            $ent xview end
        }

        bindtags $ent [list $ent Entry]
        bind $ent <Escape> {set ListBox::_edit(wait) 0}
        bind $ent <Return> {set ListBox::_edit(wait) 1}
	if { $clickres == 0 || $clickres == 1 } {
	    bind $frame <Button>  [list set ListBox::_edit(wait) $clickres]
	}

        set ok 0
        while { !$ok } {
            tkwait variable ListBox::_edit(wait)
            if { !$_edit(wait) || $verifycmd == "" ||
                 [uplevel \#0 $verifycmd [list $_edit(text)]] } {
                set ok 1
            }
        }
        trace vdelete ListBox::_edit(text) w [list ListBox::_update_edit_size $path $ent $idw $wmax]
        grab release $frame
        BWidget::focus release $ent
        destroy $frame
        $path.c delete $idw
        $path.c itemconfigure $idn    -fill $oldfg
        $path.c itemconfigure s:$item -fill $sbg -outline $sbg

        if { $_edit(wait) } {
            return $_edit(text)
        }
    }
    return ""
}


# ----------------------------------------------------------------------------
#  Command ListBox::xview
# ----------------------------------------------------------------------------
proc ListBox::xview { path args } {
    return [eval [list $path.c xview] $args]
}


# ----------------------------------------------------------------------------
#  Command ListBox::yview
# ----------------------------------------------------------------------------
proc ListBox::yview { path args } {
    return [eval [list $path.c yview] $args]
}


proc ListBox::getcanvas { path } {
    return $path.c
}


proc ListBox::curselection { path } {
    return [$path selection get]
}


# ----------------------------------------------------------------------------
#  Command ListBox::_update_edit_size
# ----------------------------------------------------------------------------
proc ListBox::_update_edit_size { path entry idw wmax args } {
    set entw [winfo reqwidth $entry]
    if { $entw >= $wmax } {
        $path.c itemconfigure $idw -width $wmax
    } else {