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[/] [or1k/] [tags/] [start/] [insight/] [tk/] [library/] [focus.tcl] - Blame information for rev 1765

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1 578 markom 
# focus.tcl --
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#
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# This file defines several procedures for managing the input
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# focus.
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#
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# SCCS: @(#) focus.tcl 1.17 96/02/16 10:48:21
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#
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# Copyright (c) 1994-1995 Sun Microsystems, Inc.
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#
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# See the file "license.terms" for information on usage and redistribution
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# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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#
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# tk_focusNext --
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# This procedure returns the name of the next window after "w" in
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# "focus order" (the window that should receive the focus next if
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# Tab is typed in w).  "Next" is defined by a pre-order search
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# of a top-level and its non-top-level descendants, with the stacking
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# order determining the order of siblings.  The "-takefocus" options
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# on windows determine whether or not they should be skipped.
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#
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# Arguments:
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# w -           Name of a window.
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proc tk_focusNext w {
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    set cur $w
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    while 1 {
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        # Descend to just before the first child of the current widget.
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        set parent $cur
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        set children [winfo children $cur]
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        set i -1
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        # Look for the next sibling that isn't a top-level.
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        while 1 {
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            incr i
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            if {$i < [llength $children]} {
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                set cur [lindex $children $i]
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                if {[winfo toplevel $cur] == $cur} {
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                    continue
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                } else {
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                    break
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                }
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            }
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            # No more siblings, so go to the current widget's parent.
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            # If it's a top-level, break out of the loop, otherwise
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            # look for its next sibling.
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            set cur $parent
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            if {[winfo toplevel $cur] == $cur} {
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                break
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            }
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            set parent [winfo parent $parent]
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            set children [winfo children $parent]
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            set i [lsearch -exact $children $cur]
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        }
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        if {($cur == $w) || [tkFocusOK $cur]} {
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            return $cur
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        }
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    }
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}
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# tk_focusPrev --
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# This procedure returns the name of the previous window before "w" in
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# "focus order" (the window that should receive the focus next if
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# Shift-Tab is typed in w).  "Next" is defined by a pre-order search
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# of a top-level and its non-top-level descendants, with the stacking
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# order determining the order of siblings.  The "-takefocus" options
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# on windows determine whether or not they should be skipped.
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#
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# Arguments:
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# w -           Name of a window.
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proc tk_focusPrev w {
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    set cur $w
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    while 1 {
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        # Collect information about the current window's position
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        # among its siblings.  Also, if the window is a top-level,
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        # then reposition to just after the last child of the window.
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        if {[winfo toplevel $cur] == $cur}  {
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            set parent $cur
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            set children [winfo children $cur]
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            set i [llength $children]
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        } else {
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            set parent [winfo parent $cur]
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            set children [winfo children $parent]
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            set i [lsearch -exact $children $cur]
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        }
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        # Go to the previous sibling, then descend to its last descendant
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        # (highest in stacking order.  While doing this, ignore top-levels
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        # and their descendants.  When we run out of descendants, go up
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        # one level to the parent.
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        while {$i > 0} {
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            incr i -1
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            set cur [lindex $children $i]
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            if {[winfo toplevel $cur] == $cur} {
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                continue
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            }
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            set parent $cur
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            set children [winfo children $parent]
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            set i [llength $children]
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        }
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        set cur $parent
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        if {($cur == $w) || [tkFocusOK $cur]} {
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            return $cur
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        }
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    }
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}
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# tkFocusOK --
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#
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# This procedure is invoked to decide whether or not to focus on
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# a given window.  It returns 1 if it's OK to focus on the window,
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# 0 if it's not OK.  The code first checks whether the window is
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# viewable.  If not, then it never focuses on the window.  Then it
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# checks the -takefocus option for the window and uses it if it's
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# set.  If there's no -takefocus option, the procedure checks to
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# see if (a) the widget isn't disabled, and (b) it has some key
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# bindings.  If all of these are true, then 1 is returned.
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#
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# Arguments:
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# w -           Name of a window.
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proc tkFocusOK w {
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    set code [catch {$w cget -takefocus} value]
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    if {($code == 0) && ($value != "")} {
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        if {$value == 0} {
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            return 0
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        } elseif {$value == 1} {
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            return [winfo viewable $w]
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        } else {
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            set value [uplevel #0 $value $w]
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            if {$value != ""} {
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                return $value
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            }
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        }
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    }
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    if {![winfo viewable $w]} {
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        return 0
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    }
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    set code [catch {$w cget -state} value]
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    if {($code == 0) && ($value == "disabled")} {
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        return 0
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    }
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    regexp Key|Focus "[bind $w] [bind [winfo class $w]]"
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}
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# tk_focusFollowsMouse --
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#
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# If this procedure is invoked, Tk will enter "focus-follows-mouse"
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# mode, where the focus is always on whatever window contains the
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# mouse.  If this procedure isn't invoked, then the user typically
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# has to click on a window to give it the focus.
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#
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# Arguments:
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# None.
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proc tk_focusFollowsMouse {} {
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    set old [bind all <Enter>]
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    set script {
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        if {("%d" == "NotifyAncestor") || ("%d" == "NotifyNonlinear")
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                || ("%d" == "NotifyInferior")} {
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                    if {[tkFocusOK %W]} {
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                        focus %W
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                    }
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        }
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    }
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    if {$old != ""} {
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        bind all <Enter> "$old; $script"
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    } else {
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        bind all <Enter> $script
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    }
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}

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