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#!/usr/bin/env ruby
=begin
bindings.rb - Ruby/GTK sample script.
Copyright (c) 2002-2015 Ruby-GNOME2 Project Team
This program is licenced under the same licence as Ruby-GNOME2.
=end
=begin
Usage:
bindings.rb <filename>
Following key bindings are effective in the TextView area.
<Control> + l : scroll down by one page
<Control> + m : scroll up by one page
<Control> + j : move cursor donw by one line
<Control> + k : move cursor up by one line
clicking buttons cause following effect
"Ctrl + l" : same as pressing <Control> + l in text view area.
"Ctrl + m" : same as pressing <Control> + m in text view area.
"cancel Ctrl +j/k" : disable <Control> + j and <Control> + k bindings.
=end
require "gtk3"
class Pager < Gtk::TextView
def initialize(path)
@path = path
super()
load
set_editable(false)
set_size_request(400, 400)
end
private
def load
open(@path).read.each_line do |line|
buffer.insert_at_cursor(line)
end
buffer.place_cursor(buffer.start_iter)
end
end
file_path = ARGV[0] || __FILE__
window = Gtk::Window.new
window.name = "pager_window"
css_provider = Gtk::CssProvider.new
if Gtk::Version.or_later?(3, 20, 0)
css_provider.load(:data => <<CSS)
@binding-set MoveCursor {
bind "<Control>j" { "move-cursor" (display-lines, 1, 0) };
bind "<Control>k" { "move-cursor" (display-lines, -1, 0) };
bind "<Control>l" { "move-cursor" (buffer-ends, 1, 0) };
bind "<Control>m" { "move-cursor" (buffer-ends, -1, 0) };
}
textview {
caret-color: green;
-GtkWidget-aspect-ratio: 1.0;
font: 20 Sans;
color: #aaa;
background-color: #333 ;
-gtk-key-bindings: MoveCursor;
}
CSS
else
css_provider.load(:data => <<CSS)
@binding-set MoveCursor {
bind "<Control>j" { "move-cursor" (display-lines, 1, 0) };
bind "<Control>k" { "move-cursor" (display-lines, -1, 0) };
bind "<Control>l" { "move-cursor" (buffer-ends, 1, 0) };
bind "<Control>m" { "move-cursor" (buffer-ends, -1, 0) };
}
GtkTextView {
-GtkWidget-cursor-color: green;
-GtkWidget-aspect-ratio: 1.0;
font: 20 Sans;
color: #aaa;
background-color: #333 ;
gtk-key-bindings: MoveCursor;
}
CSS
end
hbox = Gtk::Box.new(:horizontal)
hbox.add(button1 = Gtk::Button.new(:label => "Ctrl + l"))
hbox.add(button2 = Gtk::Button.new(:label => "Ctrl + m"))
hbox.add(button3 = Gtk::Button.new(:label => "Cancel Ctrl + j/k"))
vbox = Gtk::Box.new(:vertical)
sw = Gtk::ScrolledWindow.new
sw.set_size_request(500, 500)
pager = Pager.new(file_path)
pager.style_context.add_provider(css_provider, Gtk::StyleProvider::PRIORITY_USER)
sw.add(pager)
vbox.add(hbox)
vbox.add(sw)
window.add(vbox)
window.show_all
window.signal_connect("destroy") { Gtk.main_quit }
binding_set = Gtk::BindingSet.find("MoveCursor")
button1.signal_connect "clicked" do
binding_set.activate(Gdk::Keyval::KEY_l, Gdk::ModifierType::CONTROL_MASK, pager)
pager.grab_focus
end
button2.signal_connect "clicked" do
binding_set.activate(Gdk::Keyval::KEY_m, Gdk::ModifierType::CONTROL_MASK, pager)
pager.grab_focus
end
button3.signal_connect "clicked" do
binding_set.remove(Gdk::Keyval::KEY_j, Gdk::ModifierType::CONTROL_MASK)
binding_set.remove(Gdk::Keyval::KEY_k, Gdk::ModifierType::CONTROL_MASK)
pager.grab_focus
end
pager.grab_focus
Gtk.main
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