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- # ------------------------------------------------------------------------------
- # scrollview.tcl
- # This file is part of Unifix BWidget Toolkit
- # $Id: scrollview.tcl,v 1.4 2000/06/15 00:45:16 kuchler Exp $
- # ------------------------------------------------------------------------------
- # Index of commands:
- # - ScrolledWindow::create
- # - ScrolledWindow::configure
- # - ScrolledWindow::cget
- # - ScrolledWindow::_set_hscroll
- # - ScrolledWindow::_set_vscroll
- # - ScrolledWindow::_update_scroll
- # - ScrolledWindow::_set_view
- # - ScrolledWindow::_resize
- # ------------------------------------------------------------------------------
-
- namespace eval ScrollView {
- Widget::tkinclude ScrollView canvas :canvas \
- include {-relief -borderwidth -background -width -height -cursor} \
- initialize {-relief flat -borderwidth 0 -width 30 -height 30 \
- -cursor crosshair}
-
- Widget::declare ScrollView {
- {-width TkResource 30 0 canvas}
- {-height TkResource 30 0 canvas}
- {-background TkResource "" 0 canvas}
- {-foreground String black 0}
- {-fill String "" 0}
- {-relief TkResource flat 0 canvas}
- {-borderwidth TkResource 0 0 canvas}
- {-cursor TkResource crosshair 0 canvas}
- {-window String "" 0}
- {-fg Synonym -foreground}
- {-bg Synonym -background}
- {-bd Synonym -borderwidth}
- }
-
- # Widget::addmap ScrollView "" :canvas {
- # -relief {} -borderwidth {} -background {}
- # -width {} -height {} -cursor {}
- # }
-
- bind BwScrollView <ButtonPress-1> {ScrollView::_set_view %W set %x %y}
- bind BwScrollView <B1-Motion> {ScrollView::_set_view %W motion %x %y}
- bind BwScrollView <Configure> {ScrollView::_resize %W}
- bind BwScrollView <Destroy> {ScrollView::_destroy %W}
-
- proc ::ScrollView {path args} {
- return [eval ScrollView::create $path $args]
- }
-
- proc use {} {}
-
- variable _widget
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::create
- # ------------------------------------------------------------------------------
- proc ScrollView::create { path args } {
- variable _widget
-
- Widget::init ScrollView $path $args
- eval canvas $path [Widget::subcget $path :canvas] -highlightthickness 0
- rename $path ::$path:canvas
-
- set w [Widget::cget $path -window]
- set _widget($path,bd) [Widget::cget $path -borderwidth]
- set _widget($path,width) [Widget::cget $path -width]
- set _widget($path,height) [Widget::cget $path -height]
-
- if {[winfo exists $w]} {
- set _widget($path,oldxscroll) [$w cget -xscrollcommand]
- set _widget($path,oldyscroll) [$w cget -yscrollcommand]
- $w configure \
- -xscrollcommand "ScrollView::_set_hscroll $path" \
- -yscrollcommand "ScrollView::_set_vscroll $path"
- }
- $path:canvas create rectangle -2 -2 -2 -2 \
- -fill [Widget::cget $path -fill] \
- -outline [Widget::cget $path -foreground] \
- -tags view
-
- bindtags $path [list $path BwScrollView [winfo toplevel $path] all]
-
- proc ::$path { cmd args } "return \[eval ScrollView::\$cmd $path \$args\]"
-
- return $path
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::configure
- # ------------------------------------------------------------------------------
- proc ScrollView::configure { path args } {
- variable _widget
-
- set oldw [Widget::getoption $path -window]
- set res [Widget::configure $path $args]
-
- if { [Widget::hasChanged $path -window w] } {
- if { [winfo exists $oldw] } {
- $oldw configure \
- -xscrollcommand $_widget($path,oldxscroll) \
- -yscrollcommand $_widget($path,oldyscroll)
- }
- if { [winfo exists $w] } {
- set _widget($path,oldxscroll) [$w cget -xscrollcommand]
- set _widget($path,oldyscroll) [$w cget -yscrollcommand]
- $w configure \
- -xscrollcommand "ScrollView::_set_hscroll $path" \
- -yscrollcommand "ScrollView::_set_vscroll $path"
- } else {
- $path:canvas coords view -2 -2 -2 -2
- set _widget($path,oldxscroll) {}
- set _widget($path,oldyscroll) {}
- }
- }
-
- if { [Widget::hasChanged $path -fill fill] |
- [Widget::hasChanged $path -foreground fg] } {
- $path:canvas itemconfigure view \
- -fill $fill \
- -outline $fg
- }
-
- return $res
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::cget
- # ------------------------------------------------------------------------------
- proc ScrollView::cget { path option } {
- return [Widget::cget $path $option]
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::_destroy
- # ------------------------------------------------------------------------------
- proc ScrollView::_destroy { path } {
- variable _widget
-
- set w [Widget::getoption $path -window]
- if { [winfo exists $w] } {
- $w configure \
- -xscrollcommand $_widget($path,oldxscroll) \
- -yscrollcommand $_widget($path,oldyscroll)
- }
- unset _widget($path,oldxscroll)
- unset _widget($path,oldyscroll)
- unset _widget($path,bd)
- unset _widget($path,width)
- unset _widget($path,height)
- if {[info exists _widget($path,dx)]} {
- unset _widget($path,dx)
- }
- if {[info exists _widget($path,dy)]} {
- unset _widget($path,dy)
- }
- Widget::destroy $path
- rename $path {}
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::_set_hscroll
- # ------------------------------------------------------------------------------
- proc ScrollView::_set_hscroll { path vmin vmax } {
- variable _widget
-
- set c [$path:canvas coords view]
- set x0 [expr {$vmin*$_widget($path,width)+$_widget($path,bd)}]
- set x1 [expr {$vmax*$_widget($path,width)+$_widget($path,bd)-1}]
- $path:canvas coords view $x0 [lindex $c 1] $x1 [lindex $c 3]
- if { $_widget($path,oldxscroll) != "" } {
- uplevel \#0 $_widget($path,oldxscroll) $vmin $vmax
- }
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::_set_vscroll
- # ------------------------------------------------------------------------------
- proc ScrollView::_set_vscroll { path vmin vmax } {
- variable _widget
-
- set c [$path:canvas coords view]
- set y0 [expr {$vmin*$_widget($path,height)+$_widget($path,bd)}]
- set y1 [expr {$vmax*$_widget($path,height)+$_widget($path,bd)-1}]
- $path:canvas coords view [lindex $c 0] $y0 [lindex $c 2] $y1
- if { $_widget($path,oldyscroll) != "" } {
- uplevel \#0 $_widget($path,oldyscroll) $vmin $vmax
- }
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::_update_scroll
- # ------------------------------------------------------------------------------
- proc ScrollView::_update_scroll { path callscroll hminmax vminmax } {
- variable _widget
-
- set c [$path:canvas coords view]
- set hmin [lindex $hminmax 0]
- set hmax [lindex $hminmax 1]
- set vmin [lindex $vminmax 0]
- set vmax [lindex $vminmax 1]
- set x0 [expr {$hmin*$_widget($path,width)+$_widget($path,bd)}]
- set x1 [expr {$hmax*$_widget($path,width)+$_widget($path,bd)-1}]
- set y0 [expr {$vmin*$_widget($path,height)+$_widget($path,bd)}]
- set y1 [expr {$vmax*$_widget($path,height)+$_widget($path,bd)-1}]
- $path:canvas coords view $x0 $y0 $x1 $y1
- if { $callscroll } {
- if { $_widget($path,oldxscroll) != "" } {
- uplevel \#0 $_widget($path,oldxscroll) $hmin $hmax
- }
- if { $_widget($path,oldyscroll) != "" } {
- uplevel \#0 $_widget($path,oldyscroll) $vmin $vmax
- }
- }
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::_set_view
- # ------------------------------------------------------------------------------
- proc ScrollView::_set_view { path cmd x y } {
- variable _widget
-
- set w [Widget::getoption $path -window]
- if {[winfo exists $w]} {
- if {![string compare $cmd "set"]} {
- set c [$path:canvas coords view]
- set x0 [lindex $c 0]
- set y0 [lindex $c 1]
- set x1 [lindex $c 2]
- set y1 [lindex $c 3]
- if {$x >= $x0 && $x <= $x1 &&
- $y >= $y0 && $y <= $y1} {
- set _widget($path,dx) [expr {$x-$x0}]
- set _widget($path,dy) [expr {$y-$y0}]
- return
- } else {
- set x0 [expr {$x-($x1-$x0)/2}]
- set y0 [expr {$y-($y1-$y0)/2}]
- set _widget($path,dx) [expr {$x-$x0}]
- set _widget($path,dy) [expr {$y-$y0}]
- set vh [expr {double($x0-$_widget($path,bd))/$_widget($path,width)}]
- set vv [expr {double($y0-$_widget($path,bd))/$_widget($path,height)}]
- }
- } elseif {![string compare $cmd "motion"]} {
- set vh [expr {double($x-$_widget($path,dx)-$_widget($path,bd))/$_widget($path,width)}]
- set vv [expr {double($y-$_widget($path,dy)-$_widget($path,bd))/$_widget($path,height)}]
- }
- $w xview moveto $vh
- $w yview moveto $vv
- _update_scroll $path 1 [$w xview] [$w yview]
- }
- }
-
-
- # ------------------------------------------------------------------------------
- # Command ScrollView::_resize
- # ------------------------------------------------------------------------------
- proc ScrollView::_resize { path } {
- variable _widget
-
- set _widget($path,bd) [Widget::getoption $path -borderwidth]
- set _widget($path,width) [expr {[winfo width $path]-2*$_widget($path,bd)}]
- set _widget($path,height) [expr {[winfo height $path]-2*$_widget($path,bd)}]
- set w [Widget::getoption $path -window]
- if { [winfo exists $w] } {
- _update_scroll $path 0 [$w xview] [$w yview]
- }
- }
-