DZone Snippets: gui code

Basic wxRuby Form Example

dmullet (David Mullet) — Wed, 14 Nov 2007 03:13:58 GMT





require 'wx'

include Wx



class MyFrame < Frame

    def initialize()

        super(nil, -1, 'My Frame Title')

        # First create the controls

        @my_panel = Panel.new(self)

        @my_label = StaticText.new(@my_panel, -1, 'My Label Text', 

            DEFAULT_POSITION, DEFAULT_SIZE, ALIGN_CENTER)

        @my_textbox = TextCtrl.new(@my_panel, -1, 'Default Textbox Value')

        @my_combo = ComboBox.new(@my_panel, -1, 'Default Combo Text', 

            DEFAULT_POSITION, DEFAULT_SIZE, ['Item 1', 'Item 2', 'Item 3'])

        @my_button = Button.new(@my_panel, -1, 'My Button Text')

        # Bind controls to functions

        evt_button(@my_button.get_id()) { |event| my_button_click(event)}

        # Now do the layout

        @my_panel_sizer = BoxSizer.new(VERTICAL)

        @my_panel.set_sizer(@my_panel_sizer)

        @my_panel_sizer.add(@my_label, 0, GROW|ALL, 2)

        @my_panel_sizer.add(@my_textbox, 0, GROW|ALL, 2)

        @my_panel_sizer.add(@my_combo, 0, GROW|ALL, 2)

        @my_panel_sizer.add(@my_button, 0, GROW|ALL, 2)        

        show()

    end

    

    def my_button_click(event)

        # Your code here

    end

end



class MyApp < App

    def on_init

        MyFrame.new

    end

end



MyApp.new.main_loop()

Further details and discussion here.

Java - Mini Lettore Wav

whitetiger () — Mon, 15 May 2006 01:50:06 GMT

// Piccolissimo Lettore Audio per Java



package Multimedia;



import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import javax.swing.plaf.metal.MetalLookAndFeel;



public class AudioSystem

{

	public static void main(String[] args)

	{

		JFrame.setDefaultLookAndFeelDecorated(true);

		JDialog.setDefaultLookAndFeelDecorated(true);

		

		try

		{

			UIManager.setLookAndFeel(new MetalLookAndFeel());

		}

		catch(UnsupportedLookAndFeelException e)

		{

			e.printStackTrace();

		}

		

		new AudioGUI();

	}

}



package Multimedia;



import java.awt.Container;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

import java.io.File;



import javax.swing.JButton;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.JPanel;



public class AudioGUI extends JFrame implements WindowListener

{

	public AudioGUI()

	{

		this.setTitle("AudioSystem");

		this.setSize(240, 100);

		this.setResizable(false);

		

		this.addWindowListener(this);

		

		Container gc = this.getContentPane();

		gc.add(new AudioGUIPan());

		

		this.setVisible(true);

	}



	public void windowOpened(WindowEvent e)

	{

		

	}



	public void windowClosing(WindowEvent e)

	{

		System.exit(0);

	}



	public void windowClosed(WindowEvent e)

	{

		

	}



	public void windowIconified(WindowEvent e)

	{

		

	}



	public void windowDeiconified(WindowEvent e)

	{

		

	}



	public void windowActivated(WindowEvent e)

	{

		

	}



	public void windowDeactivated(WindowEvent e)

	{

		

	}

}



class AudioGUIPan extends JPanel implements ActionListener

{

	private JButton play;

	private JButton stop;

	private JButton loop;

	private JButton open;

	private JButton close;

	

	private JFileChooser jfc;

	

	private String file;

	

	private AudioDevice ad;

	

	public AudioGUIPan()

	{

		play = new JButton("Play");

		play.addActionListener(this);

		stop = new JButton("Stop");

		stop.addActionListener(this);

		open = new JButton("Open");

		open.addActionListener(this);

		close = new JButton("Close");

		close.addActionListener(this);

		

		this.add(stop);

		this.add(play);

		this.add(open);

		this.add(close);

	}



	public void actionPerformed(ActionEvent e)

	{

		if(e.getSource() == close)

		{

			System.exit(0);

		}

		else if(e.getSource() == open)

		{

			jfc = new JFileChooser();

			jfc.setFileFilter(new AudioFilter());

			

			if(jfc.showOpenDialog(this) != JFileChooser.CANCEL_OPTION)

			{

				file = jfc.getSelectedFile().getAbsolutePath();

				ad = new AudioDevice(new File(file));

			}

		}

		else if(e.getSource() == play)

		{

			if(ad != null)

				ad.play();

		}

		else if(e.getSource() == stop)

		{

			if(ad != null)

				ad.stop();

		}

	}

}



package Multimedia;

import java.io.File;



import javax.swing.filechooser.FileFilter;



public class AudioFilter extends FileFilter

{

	public boolean accept(File f)

	{

		return f.getName().toLowerCase().endsWith(".wav") || f.isDirectory();

	}



	public String getDescription()

	{

		return "Audio File *.wav";

	}

}



package Multimedia;



import java.applet.Applet;

import java.applet.AudioClip;

import java.io.File;

import java.net.MalformedURLException;



public class AudioDevice implements AudioClip

{

	private AudioClip ac;

	public AudioDevice(File f)

	{		

		try

		{

			ac = Applet.newAudioClip(f.toURL());

		}

		catch(MalformedURLException e)

		{

			e.printStackTrace();

		}

	}

	

	public void play()

	{

		ac.play();

	}



	public void stop()

	{

		ac.stop();

	}



	public void loop()

	{

		

	}

}

Java - UIManager all-windows

whitetiger () — Mon, 15 May 2006 01:41:13 GMT

// Imposto il tema Metal non solo all'interno delle finestre di Java, ma anche al suo esterno...



    // Con queste definizioni dico che tutti i frame e i dialog prendono il tema Metal

    JFrame.setDefaultLookAndFeelDecorated(true);

    JDialog.setDefaultLookAndFeelDecorated(true);

    //



    try

    {

        // Con questa imposto il tema

	UIManager.setLookAndFeel(new MetalLookAndFeel());

    }

    catch(UnsupportedLookAndFeelException e)

    {

	e.printStackTrace();

    }

    // In questo modo tutte le finestre avranno il tema Metal

Drawing an arrow cursor

korakot (Korakot Chaovavanich) — Fri, 10 Feb 2006 09:06:11 GMT

Calling polygon may be faster than a blit.



x,y = 20,20

arrow = [(0,0), (0,10), (2,8), (4,12), (6,11), (4,7), (7,7)]

canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff)

Here's an example app. It let you move cursor around.
When you press the select key, a red circle is drawn.
The longer you press, the bigger the circle.

Start with the usual stuff



import e32

from appuifw import *

from key_codes import *



class Keyboard(object):

    def __init__(self):

        self.state = {}  # is this key pressing ?

        self.buffer= {}  # is it waiting to be processed ?

    def handle_event(self, event): # for event_callback

        code = event['scancode']

        if event['type'] == EEventKeyDown:

            self.buffer[code]= 1   # put into queue

            self.state[code] = 1

        elif event['type'] == EEventKeyUp:

            self.state[code] = 0

    def pressing(self, code):      # just check

        return self.state.get(code,0)

    def pressed(self, code):       # check and process the event

        if self.buffer.get(code,0):

            self.buffer[code] = 0  # take out of queue

            return 1

        return 0



key = Keyboard()

app.body = canvas = Canvas(event_callback=key.handle_event)



def quit():

    global running

    running = 0



app.exit_key_handler = quit

running = 1

Then the main part of this specific app.



x,y = 20,20

arrow = [(0,0), (0,10), (2,8), (4,12), (6,11), (4,7), (7,7)]



while running:

    if key.pressing(EScancodeUpArrow):

        y -= 1

    if key.pressing(EScancodeDownArrow):

        y += 1

    if key.pressing(EScancodeLeftArrow):

        x -= 1

    if key.pressing(EScancodeRightArrow):

        x += 1

    if key.pressed(EScancodeSelect):

        r = 1

        while key.pressing(EScancodeSelect):

            r += 1       # bigger red circle

            canvas.ellipse([(x-r,y-r),(x+r,y+r)], fill=0xff0000)

            canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff)

            e32.ao_sleep(0.03)



    canvas.clear()

    canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff)

    e32.ao_sleep(0.01)

Using icons in Listbox

korakot (Korakot Chaovavanich) — Fri, 01 Jul 2005 15:24:44 GMT

pys60 1.1.3 provide some graphics capabilitis.
One of them is using icons in Listbox
(code taken from pys60 API reference)



icon1 = appuifw.Icon(u"z:\\system\\data\\avkon.mbm", 28, 29)

icon2 = appuifw.Icon(u"z:\\system\\data\\avkon.mbm ", 40, 41)

entries = [(u"Signal", icon1),

           (u"Battery", icon2)]

lb = appuifw.Listbox(entries, lbox_observe)

Listbox is one of the 3 types that can be assigned to app.body
(i.e. Text, Listbox, Canvas)
So, to make code above able to run, you must add
appuifw.app.body = lb
and the function lbox_observe that will handle the selection
need to be defined.

Borderless JButton

llucifer (Philipp Meier) — Tue, 03 May 2005 18:25:44 GMT

To create a borderless JButton in swing use the following:



JButton taskButton = new JButton(action);

taskButton.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));

taskButton.setHorizontalAlignment(JButton.LEADING); // optional

taskButton.setBorderPainted(false);

taskButton.setContentAreaFilled(false);

This is useful for "hyperlink" style buttons or "task buttons".