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#
# tkballoonhelp.rb : simple balloon help widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
#
# Add a balloon help to a widget.
# This widget has only poor featureas. If you need more useful features,
# please try to use the Tix extension of Tcl/Tk under Ruby/Tk.
#
# The interval time to display a balloon help is defined 'interval' option
# (default is 750ms).
#
require 'tk'
module Tk
module RbWidget
class BalloonHelp<TkLabel
end
end
end
class Tk::RbWidget::BalloonHelp<TkLabel
DEFAULT_FOREGROUND = 'black'
DEFAULT_BACKGROUND = 'white'
DEFAULT_INTERVAL = 750
def _balloon_binding(interval)
@timer = TkAfter.new(interval, 1, proc{show})
def @timer.interval(val)
@sleep_time = val
end
@bindtag = TkBindTag.new
@bindtag.bind('Enter', proc{@timer.start})
@bindtag.bind('Motion', proc{@timer.restart; erase})
@bindtag.bind('Any-ButtonPress', proc{@timer.restart; erase})
@bindtag.bind('Leave', proc{@timer.stop; erase})
tags = @parent.bindtags
idx = tags.index(@parent)
unless idx
ppath = TkComm.window(@parent.path)
idx = tags.index(ppath) || 0
end
tags[idx,0] = @bindtag
@parent.bindtags(tags)
end
private :_balloon_binding
def initialize(parent=nil, keys={})
@parent = parent || Tk.root
@frame = TkToplevel.new(@parent)
@frame.withdraw
@frame.overrideredirect(true)
@frame.transient(TkWinfo.toplevel(@parent))
@epath = @frame.path
if keys
keys = _symbolkey2str(keys)
else
keys = {}
end
@command = keys.delete('command')
@interval = keys.delete('interval'){DEFAULT_INTERVAL}
_balloon_binding(@interval)
# @label = TkLabel.new(@frame, 'background'=>'bisque').pack
@label = TkLabel.new(@frame,
'foreground'=>DEFAULT_FOREGROUND,
'background'=>DEFAULT_BACKGROUND).pack
@label.configure(_symbolkey2str(keys)) unless keys.empty?
@path = @label
end
def epath
@epath
end
def interval(val)
if val
@timer.interval(val)
else
@interval
end
end
def command(cmd = Proc.new)
@command = cmd
self
end
def show
x = TkWinfo.pointerx(@parent)
y = TkWinfo.pointery(@parent)
@frame.geometry("+#{x+1}+#{y+1}")
if @command
case @command.arity
when 0
@command.call
when 2
@command.call(x - TkWinfo.rootx(@parent), y - TkWinfo.rooty(@parent))
when 3
@command.call(x - TkWinfo.rootx(@parent), y - TkWinfo.rooty(@parent),
self)
else
@command.call(x - TkWinfo.rootx(@parent), y - TkWinfo.rooty(@parent),
self, @parent)
end
end
@frame.deiconify
@frame.raise
begin
@org_cursor = @parent.cget('cursor')
rescue
@org_cursor = @parent['cursor']
end
begin
@parent.configure('cursor', 'crosshair')
rescue
@parent.cursor('crosshair')
end
end
def erase
begin
@parent.configure('cursor', @org_cursor)
rescue
@parent.cursor(@org_cursor)
end
@frame.withdraw
end
def destroy
@frame.destroy
end
end
################################################
# test
################################################
if __FILE__ == $0
TkButton.new('text'=>'This button has a balloon help') {|b|
pack('fill'=>'x')
Tk::RbWidget::BalloonHelp.new(b, 'text'=>' Message ')
}
TkButton.new('text'=>'This button has another balloon help') {|b|
pack('fill'=>'x')
Tk::RbWidget::BalloonHelp.new(b,
'text'=>"CONFIGURED MESSAGE\nchange colors, and so on",
'interval'=>200, 'font'=>'courier',
'background'=>'gray', 'foreground'=>'red')
}
sb = TkScrollbox.new.pack(:fill=>:x)
sb.insert(:end, *%w(aaa bbb ccc ddd eee fff ggg hhh iii jjj kkk lll mmm))
=begin
# CASE1 : command takes no arguemnt
bh = Tk::RbWidget::BalloonHelp.new(sb, :interval=>500,
:relief=>:ridge, :background=>'white',
:command=>proc{
y = TkWinfo.pointery(sb) - TkWinfo.rooty(sb)
bh.text "current index == #{sb.nearest(y)}"
})
=end
=begin
# CASE2 : command takes 2 arguemnts
bh = Tk::RbWidget::BalloonHelp.new(sb, :interval=>500,
:relief=>:ridge, :background=>'white',
:command=>proc{|x, y|
bh.text "current index == #{sb.nearest(y)}"
})
=end
=begin
# CASE3 : command takes 3 arguemnts
Tk::RbWidget::BalloonHelp.new(sb, :interval=>500,
:relief=>:ridge, :background=>'white',
:command=>proc{|x, y, bhelp|
bhelp.text "current index == #{sb.nearest(y)}"
})
=end
=begin
# CASE4a : command is a Proc object and takes 4 arguemnts
cmd = proc{|x, y, bhelp, parent|
bhelp.text "current index == #{parent.nearest(y)}"
}
Tk::RbWidget::BalloonHelp.new(sb, :interval=>500,
:relief=>:ridge, :background=>'white',
:command=>cmd)
sb2 = TkScrollbox.new.pack(:fill=>:x)
sb2.insert(:end, *%w(AAA BBB CCC DDD EEE FFF GGG HHH III JJJ KKK LLL MMM))
Tk::RbWidget::BalloonHelp.new(sb2, :interval=>500,
:padx=>5, :relief=>:raised,
:background=>'gray25', :foreground=>'white',
:command=>cmd)
=end
#=begin
# CASE4b : command is a Method object and takes 4 arguemnts
def set_msg(x, y, bhelp, parent)
bhelp.text "current index == #{parent.nearest(y)}"
end
cmd = self.method(:set_msg)
Tk::RbWidget::BalloonHelp.new(sb, :interval=>500,
:relief=>:ridge, :background=>'white',
:command=>cmd)
sb2 = TkScrollbox.new.pack(:fill=>:x)
sb2.insert(:end, *%w(AAA BBB CCC DDD EEE FFF GGG HHH III JJJ KKK LLL MMM))
Tk::RbWidget::BalloonHelp.new(sb2, :interval=>500,
:padx=>5, :relief=>:raised,
:background=>'gray25', :foreground=>'white',
:command=>cmd)
#=end
Tk.mainloop
end
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