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#
# $Id: button.icn,v 1.7 2006-07-09 23:43:07 rparlett Exp $
#
# This file is in the public domain.
#
# Author: Robert Parlett (parlett@dial.pipex.com)
#
package gui
link graphics
$include "guih.icn"
#
# This is the parent class of the button classes, including
# checkboxes.
#
# A {Button} produces a BUTTON_PRESS_EVENT when the button is
# depressed, and code BUTTON_RELEASE_EVENT when it is released,
# as well as an ACTION_EVENT.
#
# By default, when a button holds the keyboard focus a dashed
# line appears just within the button. Then, when return is
# pressed an ACTION_EVENT is generated. The method
# {Dialog.set_initial_focus()} can be used to have the button
# have the focus when the dialog is first displayed.
#
# Buttons also repeatedly produce a BUTTON_HELD_EVENT whilst they
# are held down, rather like a repeating keyboard press. The
# delay between the initial repeat event and subsequent repeat
# events is set in the parent dialog (see above).
#
class Button : Toggle : Component(
is_down, #
is_held, #
is_checked_flag, #
label,
img_up, #
img_down, #
img_w, #
img_h, #
parent_check_box_group, #
parent_button_group, #
repeat_delay,
no_keyboard_flag, #
toggles_flag
)
method set_parent_button_group(x)
return self.parent_button_group := x
end
#
# Invoking this method disables the keyboard control over the
# button described above. No dashed line will ever appear in
# the button display and return will have no effect on the
# button even if it has the focus.
#
method set_no_keyboard()
self.no_keyboard_flag := 1
self.accepts_focus_flag := &null
end
#
# Clear the no keyboard behaviour (the default)
#
method clear_no_keyboard()
self.no_keyboard_flag := &null
self.accepts_focus_flag := 1
end
method tick()
if dispatcher.curr_time_of_day() > self.repeat_delay then
fire(BUTTON_HELD_EVENT)
end
method go_down()
self.is_down := 1
set_ticker(self.parent_dialog.repeat_rate)
end
method go_up()
self.is_down := &null
stop_ticker()
end
method handle_press(e)
local b
if self.in_region() then {
go_down()
self.repeat_delay := dispatcher.curr_time_of_day() + self.parent_dialog.repeat_delay
self.is_held := 1
every b := !(\self.parent_button_group).buttons do {
if b.is_unhidden() then {
b.is_held := 1
b.repeat_delay := self.repeat_delay
}
}
self.invalidate()
fire(BUTTON_PRESS_EVENT, e)
}
end
method handle_drag(e)
if \self.is_held then {
#
# Button held down; toggle on/off as it goes over the button
#
if self.in_region() then {
if /self.is_down then {
go_down()
invalidate()
}
} else {
if \self.is_down then {
go_up()
invalidate()
}
}
}
end
method handle_release(e)
if \self.is_held then {
self.is_held := &null
if \self.is_down then {
go_up()
fire(BUTTON_RELEASE_EVENT, e)
on_action(e)
}
}
end
method on_action(e)
if \self.toggles_flag then {
if \self.parent_check_box_group then
self.parent_check_box_group.set_which_one(self)
else
self.toggle_is_checked()
}
self.invalidate()
fire(ACTION_EVENT, e)
end
method handle_accel(e)
self.Component.handle_accel(e)
on_action(e)
end
method handle_default(e)
if \self.has_focus then {
if /self.no_keyboard_flag & e == ("\r" | "\l" | " ") then {
on_action(e)
}
}
end
method handle_event(e)
if e === (&lpress | &rpress | &mpress) then {
handle_press(e)
} else if e === (&ldrag | &rdrag | &mdrag) then {
handle_drag(e)
} else if e === (&lrelease | &rrelease | &mrelease) then {
handle_release(e)
} else
handle_default(e)
end
#
# Set the up/down images (if any) to the strings provided,
# which should be in Icon image format.
# The two images must have the same dimensions.
# @param x The up image
# @param y The down image
#
method set_imgs(x, y)
self.img_up := x
self.img_w := img_width(x) = img_width(y) | fatal("Image widths differ")
self.img_h := img_height(x) = img_height(y) | fatal("Image heights differ")
self.img_down := y
return
end
#
# Set the image (if any) to the given string, which should be in Icon image
# format.
# @param x The image
#
method set_img(x)
self.img_up := self.img_down := x
self.img_w := img_width(x)
self.img_h := img_height(x)
return x
end
#
# Toggle the checked status of the button. This method, and
# the following two methods, may be
# inappropriate for non-toggle styles of button.
#
method toggle_is_checked()
self.Toggle.toggle_is_checked()
self.invalidate()
end
#
# Set the status to checked.
#
method set_is_checked()
self.Toggle.set_is_checked()
self.invalidate()
end
#
# Set the status to unchecked.
#
method clear_is_checked()
self.Toggle.clear_is_checked()
self.invalidate()
end
#
# Set the button so that when it is pressed, it toggles
# between two states, as indicated by the is_checked
# flag.
#
# Instances of Checkbox have this flag on by default, but
# TextButton and IconButton do not. When the flag is on,
# the latter classes indicate their checked status by
# showing the button as being "down".
#
method set_toggles()
self.toggles_flag := 1
self.invalidate()
end
#
# Clear the toggles flag.
#
method clear_toggles()
self.toggles_flag := &null
self.invalidate()
end
#
# Set the label of the button, if any.
# @param x The label
#
method set_label(x)
self.label := x
self.invalidate()
return x
end
method set_one(attr, val)
case attr of {
"label" : set_label(string_val(attr, val))
"is_checked" :
if test_flag(attr, val) then
set_is_checked()
else
clear_is_checked()
"toggles" :
if test_flag(attr, val) then
set_toggles()
else
clear_toggles()
"no_keyboard" :
if test_flag(attr, val) then
set_no_keyboard()
else
clear_no_keyboard()
default: self.Component.set_one(attr, val)
}
end
initially()
self.Component.initially()
self.accepts_focus_flag := 1
end
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