listbox.tcl

Linux下的MSN聊天程序源码

        $path.c itemconfigure $idw -width 0
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::_getoption
#     Returns the value of option for node. If empty, returned value is those
#  of the ListBox.
# ----------------------------------------------------------------------------
proc ListBox::_getoption { path item option } {
    set value [Widget::getoption $path.$item $option]
    if {![string length $value]} {
        set value [Widget::getoption $path $option]
    }
    return $value
}


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

    if { $data(upd,afterid) != "" } {
        after cancel $data(upd,afterid)
    }
    if { $data(dnd,afterid) != "" } {
        after cancel $data(dnd,afterid)
    }
    foreach item $data(items) {
        Widget::destroy $path.$item
    }

    Widget::destroy $path
    unset data
}


# ----------------------------------------------------------------------------
#  Command ListBox::_see
# ----------------------------------------------------------------------------
proc ListBox::_see { path idn side } {
    set bbox [$path.c bbox $idn]
    set scrl [$path.c cget -scrollregion]

    set ymax [lindex $scrl 3]
    set dy   [$path.c cget -yscrollincrement]
    set yv   [$path.c yview]
    set yv0  [expr {round([lindex $yv 0]*$ymax/$dy)}]
    set yv1  [expr {round([lindex $yv 1]*$ymax/$dy)}]
    set y    [expr {int([lindex [$path.c coords $idn] 1]/$dy)}]
    if { $y < $yv0 } {
        $path.c yview scroll [expr {$y-$yv0}] units
    } elseif { $y >= $yv1 } {
        $path.c yview scroll [expr {$y-$yv1+1}] units
    }

    set xmax [lindex $scrl 2]
    set dx   [$path.c cget -xscrollincrement]
    set xv   [$path.c xview]
    if { [string equal $side "right"] } {
        set xv1 [expr {round([lindex $xv 1]*$xmax/$dx)}]
        set x1  [expr {int([lindex $bbox 2]/$dx)}]
        if { $x1 >= $xv1 } {
            $path.c xview scroll [expr {$x1-$xv1+1}] units
        }
    } else {
        set xv0 [expr {round([lindex $xv 0]*$xmax/$dx)}]
        set x0  [expr {int([lindex $bbox 0]/$dx)}]
        if { $x0 < $xv0 } {
            $path.c xview scroll [expr {$x0-$xv0}] units
        }
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::_update_scrollregion
# ----------------------------------------------------------------------------
proc ListBox::_update_scrollregion { path } {
    set bd   [$path.c cget -borderwidth]
    set ht   [$path.c cget -highlightthickness]
    set bd   [expr {2*($bd + $ht)}]
    set w    [expr {[winfo width  $path] - $bd}]
    set h    [expr {[winfo height $path] - $bd}]
    set xinc [$path.c cget -xscrollincrement]
    set yinc [$path.c cget -yscrollincrement]
    set bbox [$path.c bbox item win img]
    if { [llength $bbox] } {
        set xs [lindex $bbox 2]
        set ys [lindex $bbox 3]

        if { $w < $xs } {
            set w [expr {int($xs)}]
            if { [set r [expr {$w % $xinc}]] } {
                set w [expr {$w+$xinc-$r}]
            }
        }
        if { $h < $ys } {
            set h [expr {int($ys)}]
            if { [set r [expr {$h % $yinc}]] } {
                set h [expr {$h+$yinc-$r}]
            }
        }
    }

    $path.c configure -scrollregion [list 0 0 $w $h]
}


proc ListBox::_update_select_fill { path } {
    variable $path
    upvar 0  $path data

    set width [winfo width $path]

    foreach item $data(items) {
        set bbox [$path.c bbox n:$item]
        set bbox [list 0 [lindex $bbox 1] $width [lindex $bbox 3]]
        $path.c coords b:$item $bbox
    }

    _redraw_selection $path
}


# ----------------------------------------------------------------------------
#  Command ListBox::_draw_item
# ----------------------------------------------------------------------------
proc ListBox::_draw_item { path item x0 x1 y } {
    set indent  [Widget::getoption $path.$item -indent]
    set selfill [Widget::cget $path -selectfill]
    set multi   [Widget::cget $path -multicolumn]
    set i [$path.c create text [expr {$x1+$indent}] $y \
        -text   [Widget::getoption $path.$item -text] \
        -fill   [_getoption        $path $item -foreground] \
        -font   [_getoption        $path $item -font] \
        -anchor w \
        -tags   [list item n:$item click]]

    if { $selfill && !$multi } {
        set bg    [Widget::cget $path -background]
        set width [winfo width $path.c]
        set bbox  [$path.c bbox n:$item]
        set bbox  [list 0 [lindex $bbox 1] $width [lindex $bbox 3]]
        set tags  [list box b:$item click]
        $path.c create rect $bbox -fill $bg -width 0 -tags $tags
        $path.c raise $i
    }

    if { [set win [Widget::getoption $path.$item -window]] != "" } {
        $path.c create window [expr {$x0+$indent}] $y \
            -window $win -anchor w -tags [list win i:$item]
    } elseif { [set img [Widget::getoption $path.$item -image]] != "" } {
        $path.c create image [expr {$x0+$indent}] $y \
            -image $img -anchor w -tags [list img i:$item]
    }

    _set_help $path $item
}


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

    set cursor [$path.c cget -cursor]
    $path.c configure -cursor watch
    set dx   [Widget::getoption $path -deltax]
    set dy   [Widget::getoption $path -deltay]
    set padx [Widget::getoption $path -padx]
    set y0   [expr {$dy/2}]
    set x0   4
    set x1   [expr {$x0+$padx}]
    set nitem 0
    set drawn {}
    set data(xlist) {}
    if { [Widget::cget $path -multicolumn] } {
        set nrows $data(nrows)
    } else {
        set nrows [llength $data(items)]
    }
    foreach item $data(upd,delete) {
        $path.c delete i:$item n:$item s:$item b:$item
    }
    foreach item $data(items) {
        if { [info exists data(upd,create,$item)] } {
            _draw_item $path $item $x0 $x1 $y0
            unset data(upd,create,$item)
        } else {
            set indent [Widget::getoption $path.$item -indent]
            $path.c coords n:$item [expr {$x1+$indent}] $y0
            $path.c coords i:$item [expr {$x0+$indent}] $y0
        }
        incr y0 $dy
        incr nitem
        lappend drawn n:$item
        if { $nitem == $nrows } {
            set y0    [expr {$dy/2}]
            set bbox  [eval [list $path.c bbox] $drawn]
            set drawn {}
            set x0    [expr {[lindex $bbox 2]+$dx}]
            set x1    [expr {$x0+$padx}]
            set nitem 0
            lappend data(xlist) [lindex $bbox 2]
        }
    }
    if { $nitem && $nitem < $nrows } {
        set bbox  [eval [list $path.c bbox] $drawn]
        lappend data(xlist) [lindex $bbox 2]
    }
    set data(upd,delete) {}
    $path.c configure -cursor $cursor
}


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

    set selbg   [Widget::getoption $path -selectbackground]
    set selfg   [Widget::getoption $path -selectforeground]
    set selfill [Widget::getoption $path -selectfill]
    set multi   [Widget::getoption $path -multicolumn]
    foreach id [$path.c find withtag sel] {
        set item [string range [lindex [$path.c gettags $id] 1] 2 end]
        $path.c itemconfigure "n:$item" \
            -fill [_getoption $path $item -foreground]
    }
    $path.c delete sel
    foreach item $data(selitems) {
        set bbox [$path.c bbox "n:$item"]
        if { $selfill && !$multi } {
            set bbox2 [$path.c bbox "b:$item"]
            set w1 [lindex $bbox 2]
            set w2 [lindex $bbox2 2]
            if {$w1 < $w2} { set bbox $bbox2 }
        }
        if { [llength $bbox] } {
            set tags [list sel s:$item click]
            set id [$path.c create rectangle $bbox \
                -fill $selbg -outline $selbg -tags $tags]
            $path.c itemconfigure "n:$item" -fill $selfg
            $path.c lower $id
            $path.c lower b:$item
        }
    }
}


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

    if { [Widget::getoption $path -redraw] } {
        if { $data(upd,level) == 2 } {
            _redraw_items $path
        }
        _redraw_selection $path
        _update_scrollregion $path
        set data(upd,level)   0
        set data(upd,afterid) ""
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::_redraw_idle
# ----------------------------------------------------------------------------
proc ListBox::_redraw_idle { path level } {
    variable $path
    upvar 0  $path data

    if { $data(nrows) != -1 } {
        # widget is realized
        if { [Widget::getoption $path -redraw] && $data(upd,afterid) == "" } {
            set data(upd,afterid) [after idle ListBox::_redraw_listbox $path]
        }
    }
    if { $level > $data(upd,level) } {
        set data(upd,level) $level
    }
    return ""
}


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

    if { [Widget::getoption $path -multicolumn] } {
        set bd    [expr {[$path.c cget -borderwidth]+[$path.c cget -highlightthickness]}]
        set h     [expr {[winfo height $path] - 2*$bd}]
        set nrows [expr {$h/[$path.c cget -yscrollincrement]}]
        if { $nrows == 0 } {
            set nrows 1
        }
        if { $nrows != $data(nrows) } {
            set data(nrows) $nrows
            _redraw_idle $path 2
        } else {
            _update_scrollregion $path
        }
    } elseif { $data(nrows) == -1 } {
        # first Configure event
        set data(nrows) 0
        ListBox::_redraw_listbox $path
        if {[Widget::cget $path -selectfill]} {
            _update_select_fill $path
        }
    } else {
        if {[Widget::cget $path -selectfill]} {
            _update_select_fill $path
        }

        _update_scrollregion $path
    }
}


# ----------------------------------------------------------------------------
#  Command ListBox::_init_drag_cmd
# ----------------------------------------------------------------------------
proc ListBox::_init_drag_cmd { path X Y top } {
    set path [winfo parent $path]
    set ltags [$path.c gettags current]
    set item  [lindex $ltags 0]
    if { [string equal $item "item"] ||
         [string equal $item "img"]  ||
         [string equal $item "win"] } {
        set item [string range [lindex $ltags 1] 2 end]
        if { [set cmd [Widget::getoption $path -draginitcmd]] != "" } {
            return [uplevel \#0 $cmd [list $path $item $top]]
        }
        if { [set type [Widget::getoption $path -dragtype]] == "" } {
            set type "LISTBOX_ITEM"
        }
        if { [set img [Widget::getoption $path.$item -image]] != "" } {
            pack [label $top.l -image $img -padx 0 -pady 0]
        }
        return [list $type {copy move link} $item]
    }
    return {}
}


# ----------------------------------------------------------------------------
#  Command ListBox::_drop_cmd
# ----------------------------------------------------------------------------
proc ListBox::_drop_cmd { path source X Y op type dnddata } {
    set path [winfo parent $path]
    variable $path
    upvar 0  $path data

    if { [string length $data(dnd,afterid)] } {
        after cancel $data(dnd,afterid)
        set data(dnd,afterid) ""
    }
    $path.c delete drop
    set data(dnd,scroll) ""
    if { [llength $data(dnd,item)] || ![llength $data(items)] } {
        if { [set cmd [Widget::getoption $path -dropcmd]] != "" } {
            return [uplevel \#0 $cmd [list $path $source $data(dnd,item) $op $type $dnddata]]
        }
    }
    return 0
}


# ----------------------------------------------------------------------------
#  Command ListBox::_over_cmd
# ----------------------------------------------------------------------------
proc ListBox::_over_cmd { path source event X Y op type dnddata } {
    set path [winfo parent $path]
    variable $path
    upvar 0  $path data

    if { [string equal $event "leave"] } {
        # we leave the window listbox
        $path.c delete drop
        if { [string length $data(dnd,afterid)] } {
            after cancel $data(dnd,afterid)
            set data(dnd,afterid) ""
        }
        set data(dnd,scroll) ""
        return 0
    }

    if { [string equal $event "enter"] } {