File: tkhtml.tcl

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tk-html3 3.0~fossil20110109-6
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#
# tkhtml.tcl --
#
#     This file contains:
#
#         - The default bindings for the Html widget, and
#         - Some Tcl functions used by the stylesheet html.css.
#
# ------------------------------------------------------------------------
#
# Copyright (c) 2005 Eolas Technologies Inc.
# All rights reserved.
# 
# This Open Source project was made possible through the financial support
# of Eolas Technologies Inc.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the <ORGANIZATION> nor the names of its
#       contributors may be used to endorse or promote products derived from
#       this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

# Default bindings
#
# bind Html <ButtonPress>     { focus %W }
bind Html <KeyPress-Up>     { %W yview scroll -1 units }
bind Html <KeyPress-Down>   { %W yview scroll  1 units }
bind Html <KeyPress-Return> { %W yview scroll  1 units }
bind Html <KeyPress-Right>  { %W xview scroll  1 units }
bind Html <KeyPress-Left>   { %W xview scroll -1 units }
bind Html <KeyPress-Next>   { %W yview scroll  1 pages }
bind Html <KeyPress-space>  { %W yview scroll  1 pages }
bind Html <KeyPress-Prior>  { %W yview scroll -1 pages }
bind Html <ButtonPress-4>   { %W yview scroll -4 units }
bind Html <ButtonPress-5>   { %W yview scroll  4 units }


# Some Tcl procs used by html.css
#
namespace eval tkhtml {
    proc len {val} {
        if {[regexp {^[0-9]+$} $val]} {
            append val px
        }
        return $val
    }

    proc color {val} {
        set len [string length $val]
        if {0==($len % 3) && [regexp {^[0-9a-fA-F]*$} $val]} {
            return "#$val"
        }
        return $val
    }

    swproc attr {attr {len 0 1} {color 0 1}} {
        upvar N node
        set val [$node attr -default "" $attr]
        if {$val == ""}    {error ""}
        if {$len}          {return [len $val]}
        if {$color}        {return [color $val]}
        return $val
    }

    swproc aa {tag attr {len 0 1} {if NULL} {color 0 1}} {
        upvar N node
        for {} {$node != ""} {set node [$node parent]} {
            if {[$node tag] == $tag} {
                if {[catch {$node attr $attr} val]} {error ""}

                if {$if != "NULL"} {return $if}
                if {$val == ""}    {error ""}
                if {$len}          {return [len $val]}
                if {$color}        {return [color $val]}
                return $val
            }
        }
        error "No such ancestor attribute: $tag $attr"
    }

    proc create_image_tile {img} {
        set w [image width $img]
        set h [image width $img]
        if {$w <= 0 || $h <= 0} {error "empty image"}

        set tw [expr int(200 / $w) * $w]
        set th [expr int(200 / $h) * $h]
        if {$tw == 0} {set tw $w}
        if {$th == 0} {set th $h}

        set newimg [image create photo]
        $newimg copy $img -from 0 0 -to 0 0 $tw $th
        return $newimg
    }
}