Hafni is a java swing wrapper for the clojure language focusing on how components change. This does not only mean that the content displayed should be easy to change, but also that events coming from that content should be handled in a convenient way.
This is a small taste of Hafni, for a more thorough explanation of the parts of Hafni, see Usage below. The following example comes from Hafni.test.swing.action/button-test2
(frame :content (comp-and-events (button :text "*")
:act (flow (output-arr this :text) >>>
(arr #(str % "*")) >>> (input-arr this :text)))
:size 200 200 :dont_exit_on_close)
This creates a frame (a window if you so will), with a button as content, size 200x200 and which doesn't close when the frame is closed (useful when working in the repl).
(comp-and-events (button :text "*")
:act (flow (output-arr this :text) >>>
(arr #(str % "*")) >>> (input-arr this :text)))
We first create a button with the text "*".
(button :text "*")
Then, when the button is pressed, the buttons text is extracted, another "*" is added to the end of that text, and set as the current text of the button.
(flow (output-arr this :text) >>>
(arr #(str % "*")) >>> (input-arr this :text)))
What happens is that (output-arr this :name)
receives the current text, which is then sent to the function #(str % "*")
(the arr
can be ignored for now). The result of that function is then sent to the buttons text with (input-arr this :text)
. The result is that the text of the button changes in the following way:
"*"
"**"
"***"
"****"
To accomplish this, Hafni uses the datatypes Event and Arrow which are both explained in the wiki.
See Wiki/usageAdd [hafni "1.0.6-SNAPSHOT"] as a dependency in leiningen.
To the left is the java class or function that is wrapped, to the right is the corresponding function used in Hafni.
AbstractAction action
ButtonGroup button-group
JButton button
JCheckBox check-box
JCheckBoxMenuItem check-box-menu-item
JMenuItem menu-item
JRadioButton radio-button
JRadioButtonMenuItem radio-button-menu-item
JToggleButton toggle-button
JComboBox combo-box
JList jlist
JSpinner spinner
JTabbedPane tabbed-pane
JFileChooser/showOpenDialog
open-file
JFileChooser/showSaveDialog
save-file
JOptionPane/showMessageDialog
error-message
info-message
message
plain-message
warning-message
JOptionPane/showInputDialog
adv-input-dialog
text-input-dialog
BorderLayout border-layout
BoxLayout box-layout
CardLayout card-layout
FlowLayout flow-layout
GridLayout grid-layout
JMenu menu
popup-menu
JMenuBar menu-bar
JToolBar tool-bar
JTable table
table-model
JPasswordField password-field
JTextArea text-area
JTextField text-field
JTextPane text-pane
JTree tree
File file
*path-separator*
Font font
*available-fonts*
Color color
JFrame frame
JIcon icon
JLabel label
JProgressBar progress-bar
JScrollPane scroll-pane
MouseInfo mouse-position
Copyright (c) 2011 Jonathan Fischer Friberg
This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.