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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 1000ms).
#
require 'tk'
class TkBalloonHelp<TkLabel
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)
tags[idx,0] = @bindtag
@parent.bindtags(tags)
end
private :_balloon_binding
def initialize(parent=nil, keys={})
@parent = parent
@frame = TkToplevel.new(@parent)
@frame.withdraw
@frame.overrideredirect(true)
@frame.transient(TkWinfo.toplevel(@parent))
@epath = @frame.path
keys = {} unless keys
@interval = keys.delete('interval'){1000}
_balloon_binding(@interval)
@label = TkLabel.new(@frame, 'background'=>'bisque').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 show
x = TkWinfo.pointerx(@parent)
y = TkWinfo.pointery(@parent)
@frame.geometry("+#{x+1}+#{y+1}")
@frame.deiconify
@frame.raise
@org_cursor = @parent['cursor']
@parent.cursor('crosshair')
end
def erase
@parent.cursor(@org_cursor)
@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')
TkBalloonHelp.new(b, 'text'=>' Message ')
}
TkButton.new('text'=>'This button has another balloon help') {|b|
pack('fill'=>'x')
TkBalloonHelp.new(b, 'text'=>'configured message',
'interval'=>200, 'font'=>'courier',
'background'=>'gray', 'foreground'=>'red')
}
Tk.mainloop
end
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