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539 lines
16 KiB
Tcl
539 lines
16 KiB
Tcl
15 years ago
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# balloon.tcl - Balloon help.
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# Copyright (C) 1997, 1998, 2000 Cygnus Solutions.
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# Written by Tom Tromey <tromey@cygnus.com>.
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# KNOWN BUGS:
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# * On Windows, various delays should be determined from system;
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# presently they are hard-coded.
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# * Likewise, balloon positioning on Windows is a hack.
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itcl_class Balloon {
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# Name of associated global variable which should be set whenever
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# the help is shown.
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public variable {}
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# Name of associated toplevel. Private variable.
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protected _top {}
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# This is non-empty if there is an after script pending. Private
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# method.
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protected _after_id {}
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# This is an array mapping window name to help text.
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protected _help_text
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# This is an array mapping window name to notification proc.
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protected _notifiers
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# This is set to the name of the parent widget whenever the mouse is
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# in a widget with balloon help.
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protected _active {}
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# This is true when we're already calling a notification proc.
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# Private variable.
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protected _in_notifier 0
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# This holds the parent of the most recently entered widget. It is
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# used to determine when the user is moving through a toolbar.
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# Private variable.
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protected _recent_parent {}
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constructor {top} {
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global tcl_platform
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set _top $top
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set class [$this info class]
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# The standard widget-making trick.
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set hull [namespace tail $this]
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set old_name $this
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::rename $this $this-tmp-
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::toplevel $hull -class $class -borderwidth 1 -background black
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::rename $hull $old_name-win-
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::rename $this $old_name
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# By default we are invisible. When we are visible, we are
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# borderless.
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wm withdraw [namespace tail $this]
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wm overrideredirect [namespace tail $this] 1
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# Put some bindings on the toplevel. We don't use
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# bind_for_toplevel_only because *do* want these bindings to be
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# run when the event happens on some child.
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bind $_top <Enter> [list $this _enter %W]
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bind $_top <Leave> [list $this _leave]
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# Only run this one if we aren't already destroyed.
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bind $_top <Destroy> [format {
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if {[info commands %s] != ""} then {
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%s _subdestroy %%W
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}
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} $this $this]
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bind $_top <Unmap> [list $this _unmap %W]
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# Add more here as required.
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bind $_top <1> [format {
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%s _cancel
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%s _unshowballoon
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} $this $this]
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if {$tcl_platform(platform) == "windows"} then {
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set bg SystemInfoBackground
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set fg SystemInfoText
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} else {
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# This color is called `LemonChiffon' by my X installation.
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set bg \#ffffffffcccc
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set fg black
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}
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# Where we display stuff.
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label [namespace tail $this].label -background $bg -foreground $fg -font global/status \
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-anchor w -justify left
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pack [namespace tail $this].label -expand 1 -fill both
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# Clean up when the label is destroyed. This has the hidden
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# assumption that the balloon widget is a child of the toplevel to
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# which it is connected.
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bind [namespace tail $this].label <Destroy> [list $this delete]
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}
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destructor {
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catch {_cancel}
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catch {after cancel [list $this _unshowballoon]}
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catch {destroy $this}
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}
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method configure {config} {}
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# Register a notifier for a window.
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method notify {command window {tag {}}} {
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if {$tag == ""} then {
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set item $window
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} else {
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set item $window,$tag
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}
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if {$command == ""} then {
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unset _notifiers($item)
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} else {
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set _notifiers($item) $command
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}
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}
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# Register help for a window.
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method register {window text {tag {}}} {
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if {$tag == ""} then {
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set item $window
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} else {
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# Switching on the window class is bad. Do something better.
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set class [winfo class $window]
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# Switching on window class is bad. Do something better.
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switch -- $class {
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Menu {
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# Menus require bindings that other items do not require.
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# So here we make sure the menu has the binding. We could
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# speed this up by keeping a special entry in the _help_text
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# array if we wanted. Note that we pass in the name of the
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# window as we know it. That lets us work even when we're
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# actually getting events for a clone window. This is less
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# than ideal, because it means we have to hijack the
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# MenuSelect binding, but we live with it. (The other
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# choice is to make a new bindtag per menu -- yuck.)
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# This is relatively nasty: we have to encode the window
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# name as passed to the _motion method; otherwise the
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# cloning munges it. Sigh.
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regsub -all -- \\. $window ! munge
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bind $window <<MenuSelect>> [list $this _motion %W $munge]
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}
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Canvas {
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# If we need to add a binding for this tag, do so.
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if {! [info exists _help_text($window,$tag)]} then {
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$window bind $tag <Enter> +[list $this _enter $window $tag]
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$window bind $tag <Leave> +[list $this _leave]
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$window bind $tag <1> +[format {
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%s _cancel
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%s _unshowballoon
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} $this $this]
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}
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}
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Text {
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# If we need to add a binding for this tag, do so.
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if {! [info exists _help_text($window,$tag)]} then {
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$window tag bind $tag <Enter> +[list $this _enter $window $tag]
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$window tag bind $tag <Leave> +[list $this _leave]
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$window tag bind $tag <1> +[format {
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%s _cancel
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%s _unshowballoon
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} $this $this]
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}
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}
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}
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set item $window,$tag
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}
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set _help_text($item) $text
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if {$_active == $item} then {
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_set_variable $item
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# If the label is already showing, then we re-show it. Why not
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# just set the -text on the label? Because if the label changes
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# size it might be offscreen, and we need to handle that.
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if {[wm state [namespace tail $this]] == "normal"} then {
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showballoon $window $tag
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}
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}
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}
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# Cancel any pending after handler. Private method.
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method _cancel {} {
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if {$_after_id != ""} then {
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after cancel $_after_id
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set _after_id {}
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}
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}
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# This is run when the toplevel, or any child, is entered. Private
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# method.
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method _enter {W {tag {}}} {
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_cancel
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# Don't bother for menus, since we know we use a different
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# mechanism for them.
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if {[winfo class $W] == "Menu"} then {
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return
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}
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# If we just moved into the parent of the last child, then do
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# nothing. We want to keep the parent the same so the right thing
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# can happen if we move into a child of this same parent.
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set delay 1000
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if {$W != $_recent_parent} then {
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if {[winfo parent $W] == $_recent_parent} then {
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# As soon as possible.
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set delay idle
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} else {
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set _recent_parent ""
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}
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}
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if {$tag == ""} then {
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set index $W
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} else {
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set index $W,$tag
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}
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set _active $index
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if {[info exists _help_text($index)]} then {
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# There is some help text. So arrange to display it when the
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# time is up. We arbitrarily set this to 1 second.
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set _after_id [after $delay [list $this showballoon $W $tag]]
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# Set variable here; that way simply entering a window will
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# cause the text to appear.
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_set_variable $index
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}
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}
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# This is run when the toplevel, or any child, is left. Private
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# method.
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method _leave {} {
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_cancel
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_unshowballoon
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_set_variable {}
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set _active {}
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}
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# This is run to undisplay the balloon. Note that it does not
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# change the text stored in the variable. That is handled
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# elsewhere. Private method.
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method _unshowballoon {} {
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wm withdraw [namespace tail $this]
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}
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# Set the variable, if it exists. Private method.
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method _set_variable {index} {
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# Run the notifier.
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if {$index == ""} then {
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set value ""
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} elseif {[info exists _notifiers($index)] && ! $_in_notifier} then {
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if {$variable != ""} {
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upvar $variable var
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set var $_help_text($index)
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}
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set _in_notifier 1
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uplevel \#0 $_notifiers($index)
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set _in_notifier 0
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# Get value afterwards to give notifier a chance to change it.
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if {$variable != ""} {
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upvar $variable var
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set _help_text($index) $var
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}
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set value $_help_text($index)
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} else {
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set value $_help_text($index)
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}
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if {$variable != ""} then {
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upvar $variable var
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set var $value
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}
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}
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# This is run to show the balloon. Private method.
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method showballoon {W tag {keep 0}} {
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global tcl_platform
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if {$tag == ""} then {
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# An ordinary window. Position below the window, and right of
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# center.
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set _active $W
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set left [expr {[winfo rootx $W] + round ([winfo width $W] * .75)}]
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set ypos [expr {[winfo rooty $W] + [winfo height $W]}]
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set alt_ypos [winfo rooty $W]
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# Balloon shown, so set parent info.
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set _recent_parent [winfo parent $W]
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} else {
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set _active $W,$tag
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# Switching on class name is bad. Do something better. Can't
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# just use the widget's bbox method, because the results differ
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# for Text and Canvas widgets. Bummer.
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switch -- [winfo class $W] {
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Menu {
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# Recognize but do nothing.
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}
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Text {
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lassign [$W bbox $tag.first] x y width height
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set left [expr {[winfo rootx $W] + $x + round ($width * .75)}]
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set ypos [expr {[winfo rooty $W] + $y + $height}]
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set alt_ypos [expr {[winfo rooty $W] - $y}]
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}
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Canvas {
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lassign [$W bbox $tag] x1 y1 x2 y2
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# Must subtract out coordinates of top-left corner of canvas
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# window; otherwise this will get the wrong position when
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# the canvas has been scrolled.
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set tlx [$W canvasx 0]
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set tly [$W canvasy 0]
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# Must round results because canvas coordinates are floats.
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set left [expr {round ([winfo rootx $W] + $x1 - $tlx
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+ ($x2 - $x1) * .75)}]
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set ypos [expr {round ([winfo rooty $W] + $y2 - $tly)}]
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set alt_ypos [expr {round ([winfo rooty $W] + $y1 - $tly)}]
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}
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default {
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error "unrecognized window class for window \"$W\""
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}
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}
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}
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set help $_help_text($_active)
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# On Windows, the popup location is always determined by the
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# cursor. Actually, the rule seems to be somewhat more complex.
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# Unfortunately it doesn't seem to be written down anywhere.
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# Experiments show that the location is determined by the cursor
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# if the text is wider than the widget; and otherwise it is
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# centered under the widget. FIXME: we don't deal with those
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# cases.
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if {$tcl_platform(platform) == "windows"} then {
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# FIXME: for now this is turned off. It isn't enough to get the
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# cursor size; we actually have to find the bottommost "on"
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# pixel in the cursor and use that for the height. I don't know
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# how to do that.
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# lassign [ide_cursor size] dummy height
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# lassign [ide_cursor position] left ypos
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# incr ypos $height
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}
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if {[info exists left] && $help != ""} then {
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[namespace tail $this].label configure -text $help
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set lw [winfo reqwidth [namespace tail $this].label]
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set sw [winfo screenwidth [namespace tail $this]]
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set bw [$this-win- cget -borderwidth]
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if {$left + $lw + 2 * $bw >= $sw} then {
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set left [expr {$sw - 2 * $bw - $lw}]
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}
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set lh [winfo reqheight [namespace tail $this].label]
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if {$ypos + $lh >= [winfo screenheight [namespace tail $this]]} then {
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set ypos [expr {$alt_ypos - $lh}]
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}
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wm positionfrom [namespace tail $this] user
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wm geometry [namespace tail $this] +${left}+${ypos}
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update
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wm deiconify [namespace tail $this]
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raise [namespace tail $this]
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if {!$keep} {
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# After 6 seconds, close the window. The timer is reset every
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# time the window is shown.
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after cancel [list $this _unshowballoon]
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after 6000 [list $this _unshowballoon]
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}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
# This is run when a window or tag is destroyed. Private method.
|
||
|
|
method _subdestroy {W {tag {}}} {
|
||
|
|
if {$tag == ""} then {
|
||
|
|
# A window. Remove the window and any associated tags. Note
|
||
|
|
# that this is called for all Destroy events on descendents,
|
||
|
|
# even for windows which were never registered. Hence the use
|
||
|
|
# of catch.
|
||
|
|
catch {unset _help_text($W)}
|
||
|
|
foreach thing [array names _help_text($W,*)] {
|
||
|
|
unset _help_text($thing)
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
# Just a tag. This one can't be called by mistake, so this
|
||
|
|
# shouldn't need to be caught.
|
||
|
|
unset _help_text($W,$tag)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
# This is run in response to a MenuSelect event on a menu.
|
||
|
|
method _motion {window name} {
|
||
|
|
# Decode window name.
|
||
|
|
regsub -all -- ! $name . name
|
||
|
|
|
||
|
|
if {$variable == ""} then {
|
||
|
|
# There's no point to doing anything.
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
set n [$window index active]
|
||
|
|
if {$n == "none"} then {
|
||
|
|
set index ""
|
||
|
|
set _active {}
|
||
|
|
} elseif {[info exists _help_text($name,$n)]} then {
|
||
|
|
# Tag specified by index number.
|
||
|
|
set index $name,$n
|
||
|
|
set _active $name,$n
|
||
|
|
} elseif {! [catch {$window entrycget $n -label} label]
|
||
|
|
&& [info exists _help_text($name,$label)]} then {
|
||
|
|
# Tag specified by index name.
|
||
|
|
set index $name,$label
|
||
|
|
set _active $name,$label
|
||
|
|
} else {
|
||
|
|
# No help for this item.
|
||
|
|
set index ""
|
||
|
|
set _active {}
|
||
|
|
}
|
||
|
|
|
||
|
|
_set_variable $index
|
||
|
|
}
|
||
|
|
|
||
|
|
# This is run when some widget unmaps. If the widget is the current
|
||
|
|
# widget, then unmap the balloon help. Private method.
|
||
|
|
method _unmap w {
|
||
|
|
if {$w == $_active} then {
|
||
|
|
_cancel
|
||
|
|
_unshowballoon
|
||
|
|
_set_variable {}
|
||
|
|
set _active {}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
################################################################
|
||
|
|
|
||
|
|
# Find (and possibly create) balloon widget associated with window.
|
||
|
|
proc BALLOON_find_balloon {window} {
|
||
|
|
# Find our associated toplevel. If it is a menu, then keep going.
|
||
|
|
set top [winfo toplevel $window]
|
||
|
|
while {[winfo class $top] == "Menu"} {
|
||
|
|
set top [winfo toplevel [winfo parent $top]]
|
||
|
|
}
|
||
|
|
|
||
|
|
if {$top == "."} {
|
||
|
|
set bname .__balloon
|
||
|
|
} else {
|
||
|
|
set bname $top.__balloon
|
||
|
|
}
|
||
|
|
|
||
|
|
# If the balloon help for this toplevel doesn't exist, then create
|
||
|
|
# it. Yes, this relies on a magic name for the balloon help widget.
|
||
|
|
if {! [winfo exists $bname]} then {
|
||
|
|
Balloon $bname $top
|
||
|
|
}
|
||
|
|
return $bname
|
||
|
|
}
|
||
|
|
|
||
|
|
# This implements "balloon register".
|
||
|
|
proc BALLOON_command_register {window text {tag {}}} {
|
||
|
|
set b [BALLOON_find_balloon $window]
|
||
|
|
$b register $window $text $tag
|
||
|
|
}
|
||
|
|
|
||
|
|
# This implements "balloon notify".
|
||
|
|
proc BALLOON_command_notify {command window {tag {}}} {
|
||
|
|
set b [BALLOON_find_balloon $window]
|
||
|
|
$b notify $command $window $tag
|
||
|
|
}
|
||
|
|
|
||
|
|
# This implements "balloon show".
|
||
|
|
proc BALLOON_command_show {window {tag {}} {keep 0}} {
|
||
|
|
set b [BALLOON_find_balloon $window]
|
||
|
|
$b showballoon $window $tag $keep
|
||
|
|
}
|
||
|
|
|
||
|
|
proc BALLOON_command_withdraw {window} {
|
||
|
|
set b [BALLOON_find_balloon $window]
|
||
|
|
$b _unmap $window
|
||
|
|
}
|
||
|
|
|
||
|
|
# This implements "balloon variable".
|
||
|
|
proc BALLOON_command_variable {window args} {
|
||
|
|
if {[llength $args] == 0} then {
|
||
|
|
# Fetch.
|
||
|
|
set b [BALLOON_find_balloon $window]
|
||
|
|
return [$b cget -variable]
|
||
|
|
} else {
|
||
|
|
# FIXME: no arg checking here.
|
||
|
|
# Set.
|
||
|
|
set b [BALLOON_find_balloon $window]
|
||
|
|
$b configure -variable [lindex $args 0]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
# The primary interface to balloon help.
|
||
|
|
# Usage:
|
||
|
|
# balloon notify COMMAND WINDOW ?TAG?
|
||
|
|
# Run COMMAND just before the help text for WINDOW (and TAG, if
|
||
|
|
# given) is displayed. If COMMAND is the empty string, then
|
||
|
|
# notification is disabled for this window.
|
||
|
|
# balloon register WINDOW TEXT ?TAG?
|
||
|
|
# Associate TEXT as the balloon help for WINDOW.
|
||
|
|
# If TAG is given, the use the appropriate tag for association.
|
||
|
|
# For menu widgets, TAG is a menu index.
|
||
|
|
# For canvas widgets, TAG is a tagOrId.
|
||
|
|
# For text widgets, TAG is a text index. If you want to use
|
||
|
|
# the text tag FOO, use `FOO.last'.
|
||
|
|
# balloon show WINDOW ?TAG?
|
||
|
|
# Immediately pop up the balloon for the given window and tag.
|
||
|
|
# This should be used sparingly. For instance, you might need to
|
||
|
|
# use it if the tag you're interested in does not track the mouse,
|
||
|
|
# but instead is added just before show-time.
|
||
|
|
# balloon variable WINDOW ?NAME?
|
||
|
|
# If NAME specified, set balloon help variable associated
|
||
|
|
# with window. This variable is set to the text whenever the
|
||
|
|
# balloon help is on. If NAME is specified but empty,
|
||
|
|
# no variable is set. If NAME not specified, then the
|
||
|
|
# current variable name is returned.
|
||
|
|
# balloon withdraw WINDOW
|
||
|
|
# Withdraw the balloon window associated with WINDOW. This should
|
||
|
|
# be used sparingly.
|
||
|
|
proc balloon {key args} {
|
||
|
|
if {[info commands BALLOON_command_$key] == "" } then {
|
||
|
|
error "unrecognized key \"$key\""
|
||
|
|
}
|
||
|
|
|
||
|
|
eval BALLOON_command_$key $args
|
||
|
|
}
|