Article-Writing Your Own Widget/Writing Your Own Widget_files/AppendixB.htm - www.eclipse.org/articles - Git at Google

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 <title>Appendix B: SpinnerTest and Spinner</title>
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 <h2>Appendix B: SpinnerTest and Spinner</h2>
 This appendix contains the source code for the <i>SpinnerTest</i> and <i>Spinner</i> classes. The <i>Spinner</i> class loads and calls the native
 code listed in either <A href="AppendixC.htm">Appendix C: Spinner For Windows</A>, or <A
 href="AppendixD.htm">Appendix D: Spinner for Motif</A>.
 <p>
 <h3><strong>SpinnerTest.java</strong></h3>
 <pre>
 <font color="#7F0055">package</font> spinner;
 <font color="maroon">
 /*
  * (c) Copyright IBM Corp. 2000, 2001.
  * All Rights Reserved.
  */
 </font>
 <font color="#7F0055">import</font> org.eclipse.swt.*;
 <font color="#7F0055">import</font> org.eclipse.swt.widgets.*;
 <font color="#7F0055">import</font> org.eclipse.swt.events.*;
 <font color="#7F0055">import</font> org.eclipse.swt.layout.*;
 <font color="#7F0055">import</font> org.eclipse.swt.graphics.*;

 <font color="#7F0055">public class</font> SpinnerTest {

 <font color="#7F0055">public static void</font> main (String [] args) {
     Display display = <font color="#7F0055">new</font> Display ();
     Shell shell = <font color="#7F0055">new</font> Shell (display);
     shell.setLayout (<font color="#7F0055">new</font> RowLayout ());

     <font color="#7F0055">final</font> Spinner spinner = <font color="#7F0055">new</font> Spinner (shell, 0);
     spinner.setMaximum (999);
     System.out.println (<font color="blue">&quot;max set to &quot;</font> + spinner.getMaximum ());
     spinner.setSelection (500);
     System.out.println (<font color="blue">&quot;selection set to &quot;</font> + spinner.getSelection ());
     spinner.setMinimum (100);
     System.out.println (<font color="blue">&quot;min set to &quot;</font> + spinner.getMinimum ());
     Font font = <font color="#7F0055">new</font> Font (display, &quot;Courier&quot;, 20, SWT.NORMAL);
     spinner.setFont (font);
     spinner.addSelectionListener (<font color="#7F0055">new</font> SelectionAdapter () {
         <font color="#7F0055">public void</font> widgetSelected (SelectionEvent e) {
             System.out.println (spinner.getSelection ());
         }
     });
     shell.pack ();
     shell.open ();
     <font color="#7F0055">while</font> (!shell.isDisposed ()){
         <font color="#7F0055">if</font> (!display.readAndDispatch ()) display.sleep ();
     }
     font.dispose ();
 }
 }
 </pre>
 <p>
 <h3><strong>Spinner.java</strong></h3>
 <pre>
 <font color="#7F0055">package</font> spinner;
 <font color="maroon">
 /*
  * (c) Copyright IBM Corp. 2000, 2001.
  * All Rights Reserved.
  */
 </font>
 <font color="#7F0055">import</font> java.util.*;
 <font color="#7F0055">import</font> org.eclipse.swt.*;
 <font color="#7F0055">import</font> org.eclipse.swt.graphics.*;
 <font color="#7F0055">import</font> org.eclipse.swt.widgets.*;
 <font color="#7F0055">import</font> org.eclipse.swt.events.*;

 <font color="#7F0055">public class</font> Spinner <font color="#7F0055">extends</font> Composite {
     <font color="#7F0055">int</font> handleSpinner;
     <font color="#7F0055">static</font> Hashtable table = <font color="#7F0055">new</font> Hashtable ();
     <font color="#7F0055">static</font> {
         System.loadLibrary (<font color="blue">&quot;spinner&quot;</font>);
     }

     <font color="#7F0055">public</font> Spinner (Composite parent, <font color="#7F0055">int</font> style) {
         <font color="#7F0055">super</font> (parent, style);
         <font color="#7F0055">int</font> handleParent = handle;
         handleSpinner = createControl (handleParent);
         <font color="#7F0055">if</font> (handleSpinner == 0) SWT.error (SWT.ERROR_NO_HANDLES);
         table.put (<font color="#7F0055">new</font> Integer (handleSpinner), <font color="#7F0055">this</font>);
         addDisposeListener (<font color="#7F0055">new</font> DisposeListener () {
             <font color="#7F0055">public void</font> widgetDisposed (DisposeEvent e) {
                 Spinner.<font color="#7F0055">this</font>.widgetDisposed (e);
             }
         });
         addControlListener (<font color="#7F0055">new</font> ControlAdapter () {
             <font color="#7F0055">public void</font> controlResized (ControlEvent e) {
                 Spinner.<font color="#7F0055">this</font>.controlResized (e);
             }
         });
         addFocusListener (<font color="#7F0055">new</font> FocusAdapter () {
             <font color="#7F0055">public void</font> focusGained (FocusEvent e) {
                 Spinner.<font color="#7F0055">this</font>.focusGained (e);
             }
         });
         Font font = getFont ();
         setFont (handleSpinner, font.handle);
     }

     <font color="#7F0055">public void</font> setFont (Font font) {
         <font color="#7F0055">super</font>.setFont (font);
         <font color="#7F0055">int</font> hFont = 0;
         <font color="#7F0055">if</font> (font != <font color="#7F0055">null</font>) hFont = font.handle;
         setFont (handleSpinner, hFont);
     }

     <font color="#7F0055">public int</font> getSelection () {
         checkWidget ();
         <font color="#7F0055">return</font> getPosition (handleSpinner);
     }

     <font color="#7F0055">public void</font> setSelection (<font color="#7F0055">int</font> selection) {
         checkWidget ();
         setPosition (handleSpinner, selection);
     }

     <font color="#7F0055">public void</font> setMaximum (<font color="#7F0055">int</font> maximum) {
         checkWidget ();
         setMaximum (handleSpinner, maximum);
     }

     <font color="#7F0055">public int</font> getMaximum () {
         checkWidget ();
         <font color="#7F0055">return</font> getMaximum (handleSpinner);
     }

     <font color="#7F0055">public void</font> setMinimum (<font color="#7F0055">int</font> minimum) {
         checkWidget ();
         setMinimum (handleSpinner, minimum);
     }

     <font color="#7F0055">public int</font> getMinimum () {
         checkWidget ();
         <font color="#7F0055">return</font> getMinimum (handleSpinner);
     }

     <font color="#7F0055">public void</font> widgetDisposed (DisposeEvent e) {
         table.remove (<font color="#7F0055">new</font> Integer (handleSpinner));
         handleSpinner = 0;
     }

     <font color="#7F0055">public void</font> controlResized (ControlEvent e) {
         Rectangle rect = getClientArea ();
         resizeControl (handleSpinner, rect.x, rect.y, rect.width, rect.height);
     }

     <font color="#7F0055">public void</font> focusGained (FocusEvent e) {
         setFocus (handleSpinner);
     }

     <font color="#7F0055">public</font> Point computeSize (<font color="#7F0055">int</font> wHint, <font color="#7F0055">int</font> hHint, <font color="#7F0055">boolean</font> changed) {
         checkWidget ();
         <font color="#7F0055">int</font> [] result = <font color="#7F0055">new int</font> [2];
         computeSize (handleSpinner, result);
         <font color="#7F0055">if</font> (wHint != SWT.DEFAULT) result [0] = wHint;
         <font color="#7F0055">if</font> (hHint != SWT.DEFAULT) result [1] = hHint;
         <font color="#7F0055">int</font> border = getBorderWidth ();
         <font color="#7F0055">return</font> new Point (result [0] + border * 2, result [1] + border * 2);
     }

     <font color="#7F0055">public void</font> addSelectionListener (SelectionListener listener) {
         <font color="#7F0055">if</font> (listener == <font color="#7F0055">null</font>) <font color="#7F0055">throw new</font> SWTError (SWT.ERROR_NULL_ARGUMENT);
         addListener (SWT.Selection, <font color="#7F0055">new</font> TypedListener (listener));
     }

     <font color="#7F0055">static void</font> widgetSelected (<font color="#7F0055">int</font> handle) {
         Spinner spinner = (Spinner) table.get (<font color="#7F0055">new</font> Integer (handle));
         <font color="#7F0055">if</font> (spinner == <font color="#7F0055">null</font>) <font color="#7F0055">return</font>;
         spinner.notifyListeners (SWT.Selection, <font color="#7F0055">new</font> Event ());
     }

     <font color="#3F7F5F">/*********** JAVA NATIVES ************/</font>

     <font color="#7F0055">static final native int</font> createControl (<font color="#7F0055">int</font> handle);
     <font color="#7F0055">static final native void</font> computeSize (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> [] result);
     <font color="#7F0055">static final native void</font> resizeControl (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> x, <font color="#7F0055">int</font> y, <font color="#7F0055">int</font> width, <font color="#7F0055">int</font> height);
     <font color="#7F0055">static final native void</font> setPosition (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> position);
     <font color="#7F0055">static final native int</font> getPosition (<font color="#7F0055">int</font> handle);
     <font color="#7F0055">static final native void</font> setMaximum (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> max);
     <font color="#7F0055">static final native int</font> getMaximum (<font color="#7F0055">int</font> handle);
     <font color="#7F0055">static final native void</font> setMinimum (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> min);
     <font color="#7F0055">static final native int</font> getMinimum (<font color="#7F0055">int</font> handle);
     <font color="#7F0055">static final native void</font> setFont (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> hFont);
     <font color="#7F0055">static final native void</font> setFocus (<font color="#7F0055">int</font> handle);
 }
 </pre>
 </body>
 </html>
	<html>

	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
	<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
	<meta name="ProgId" content="FrontPage.Editor.Document">
	<meta name="Author" content="Carolyn MacLeod">
	<title>Appendix B: SpinnerTest and Spinner</title>
	</head>

	<body>
	<h2>Appendix B: SpinnerTest and Spinner</h2>
	This appendix contains the source code for the <i>SpinnerTest</i> and <i>Spinner</i> classes. The <i>Spinner</i> class loads and calls the native
	code listed in either <A href="AppendixC.htm">Appendix C: Spinner For Windows</A>, or <A
	href="AppendixD.htm">Appendix D: Spinner for Motif</A>.
	<p>
	<h3><strong>SpinnerTest.java</strong></h3>
	<pre>
	<font color="#7F0055">package</font> spinner;
	<font color="maroon">
	/*
	* (c) Copyright IBM Corp. 2000, 2001.
	* All Rights Reserved.
	*/
	</font>
	<font color="#7F0055">import</font> org.eclipse.swt.*;
	<font color="#7F0055">import</font> org.eclipse.swt.widgets.*;
	<font color="#7F0055">import</font> org.eclipse.swt.events.*;
	<font color="#7F0055">import</font> org.eclipse.swt.layout.*;
	<font color="#7F0055">import</font> org.eclipse.swt.graphics.*;

	<font color="#7F0055">public class</font> SpinnerTest {

	<font color="#7F0055">public static void</font> main (String [] args) {
	Display display = <font color="#7F0055">new</font> Display ();
	Shell shell = <font color="#7F0055">new</font> Shell (display);
	shell.setLayout (<font color="#7F0055">new</font> RowLayout ());

	<font color="#7F0055">final</font> Spinner spinner = <font color="#7F0055">new</font> Spinner (shell, 0);
	spinner.setMaximum (999);
	System.out.println (<font color="blue">"max set to "</font> + spinner.getMaximum ());
	spinner.setSelection (500);
	System.out.println (<font color="blue">"selection set to "</font> + spinner.getSelection ());
	spinner.setMinimum (100);
	System.out.println (<font color="blue">"min set to "</font> + spinner.getMinimum ());
	Font font = <font color="#7F0055">new</font> Font (display, "Courier", 20, SWT.NORMAL);
	spinner.setFont (font);
	spinner.addSelectionListener (<font color="#7F0055">new</font> SelectionAdapter () {
	<font color="#7F0055">public void</font> widgetSelected (SelectionEvent e) {
	System.out.println (spinner.getSelection ());
	}
	});
	shell.pack ();
	shell.open ();
	<font color="#7F0055">while</font> (!shell.isDisposed ()){
	<font color="#7F0055">if</font> (!display.readAndDispatch ()) display.sleep ();
	}
	font.dispose ();
	}
	}
	</pre>
	<p>
	<h3><strong>Spinner.java</strong></h3>
	<pre>
	<font color="#7F0055">package</font> spinner;
	<font color="maroon">
	/*
	* (c) Copyright IBM Corp. 2000, 2001.
	* All Rights Reserved.
	*/
	</font>
	<font color="#7F0055">import</font> java.util.*;
	<font color="#7F0055">import</font> org.eclipse.swt.*;
	<font color="#7F0055">import</font> org.eclipse.swt.graphics.*;
	<font color="#7F0055">import</font> org.eclipse.swt.widgets.*;
	<font color="#7F0055">import</font> org.eclipse.swt.events.*;

	<font color="#7F0055">public class</font> Spinner <font color="#7F0055">extends</font> Composite {
	<font color="#7F0055">int</font> handleSpinner;
	<font color="#7F0055">static</font> Hashtable table = <font color="#7F0055">new</font> Hashtable ();
	<font color="#7F0055">static</font> {
	System.loadLibrary (<font color="blue">"spinner"</font>);
	}

	<font color="#7F0055">public</font> Spinner (Composite parent, <font color="#7F0055">int</font> style) {
	<font color="#7F0055">super</font> (parent, style);
	<font color="#7F0055">int</font> handleParent = handle;
	handleSpinner = createControl (handleParent);
	<font color="#7F0055">if</font> (handleSpinner == 0) SWT.error (SWT.ERROR_NO_HANDLES);
	table.put (<font color="#7F0055">new</font> Integer (handleSpinner), <font color="#7F0055">this</font>);
	addDisposeListener (<font color="#7F0055">new</font> DisposeListener () {
	<font color="#7F0055">public void</font> widgetDisposed (DisposeEvent e) {
	Spinner.<font color="#7F0055">this</font>.widgetDisposed (e);
	}
	});
	addControlListener (<font color="#7F0055">new</font> ControlAdapter () {
	<font color="#7F0055">public void</font> controlResized (ControlEvent e) {
	Spinner.<font color="#7F0055">this</font>.controlResized (e);
	}
	});
	addFocusListener (<font color="#7F0055">new</font> FocusAdapter () {
	<font color="#7F0055">public void</font> focusGained (FocusEvent e) {
	Spinner.<font color="#7F0055">this</font>.focusGained (e);
	}
	});
	Font font = getFont ();
	setFont (handleSpinner, font.handle);
	}

	<font color="#7F0055">public void</font> setFont (Font font) {
	<font color="#7F0055">super</font>.setFont (font);
	<font color="#7F0055">int</font> hFont = 0;
	<font color="#7F0055">if</font> (font != <font color="#7F0055">null</font>) hFont = font.handle;
	setFont (handleSpinner, hFont);
	}

	<font color="#7F0055">public int</font> getSelection () {
	checkWidget ();
	<font color="#7F0055">return</font> getPosition (handleSpinner);
	}

	<font color="#7F0055">public void</font> setSelection (<font color="#7F0055">int</font> selection) {
	checkWidget ();
	setPosition (handleSpinner, selection);
	}

	<font color="#7F0055">public void</font> setMaximum (<font color="#7F0055">int</font> maximum) {
	checkWidget ();
	setMaximum (handleSpinner, maximum);
	}

	<font color="#7F0055">public int</font> getMaximum () {
	checkWidget ();
	<font color="#7F0055">return</font> getMaximum (handleSpinner);
	}

	<font color="#7F0055">public void</font> setMinimum (<font color="#7F0055">int</font> minimum) {
	checkWidget ();
	setMinimum (handleSpinner, minimum);
	}

	<font color="#7F0055">public int</font> getMinimum () {
	checkWidget ();
	<font color="#7F0055">return</font> getMinimum (handleSpinner);
	}

	<font color="#7F0055">public void</font> widgetDisposed (DisposeEvent e) {
	table.remove (<font color="#7F0055">new</font> Integer (handleSpinner));
	handleSpinner = 0;
	}

	<font color="#7F0055">public void</font> controlResized (ControlEvent e) {
	Rectangle rect = getClientArea ();
	resizeControl (handleSpinner, rect.x, rect.y, rect.width, rect.height);
	}

	<font color="#7F0055">public void</font> focusGained (FocusEvent e) {
	setFocus (handleSpinner);
	}

	<font color="#7F0055">public</font> Point computeSize (<font color="#7F0055">int</font> wHint, <font color="#7F0055">int</font> hHint, <font color="#7F0055">boolean</font> changed) {
	checkWidget ();
	<font color="#7F0055">int</font> [] result = <font color="#7F0055">new int</font> [2];
	computeSize (handleSpinner, result);
	<font color="#7F0055">if</font> (wHint != SWT.DEFAULT) result [0] = wHint;
	<font color="#7F0055">if</font> (hHint != SWT.DEFAULT) result [1] = hHint;
	<font color="#7F0055">int</font> border = getBorderWidth ();
	<font color="#7F0055">return</font> new Point (result [0] + border * 2, result [1] + border * 2);
	}

	<font color="#7F0055">public void</font> addSelectionListener (SelectionListener listener) {
	<font color="#7F0055">if</font> (listener == <font color="#7F0055">null</font>) <font color="#7F0055">throw new</font> SWTError (SWT.ERROR_NULL_ARGUMENT);
	addListener (SWT.Selection, <font color="#7F0055">new</font> TypedListener (listener));
	}

	<font color="#7F0055">static void</font> widgetSelected (<font color="#7F0055">int</font> handle) {
	Spinner spinner = (Spinner) table.get (<font color="#7F0055">new</font> Integer (handle));
	<font color="#7F0055">if</font> (spinner == <font color="#7F0055">null</font>) <font color="#7F0055">return</font>;
	spinner.notifyListeners (SWT.Selection, <font color="#7F0055">new</font> Event ());
	}

	<font color="#3F7F5F">/********* JAVA NATIVES **********/</font>

	<font color="#7F0055">static final native int</font> createControl (<font color="#7F0055">int</font> handle);
	<font color="#7F0055">static final native void</font> computeSize (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> [] result);
	<font color="#7F0055">static final native void</font> resizeControl (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> x, <font color="#7F0055">int</font> y, <font color="#7F0055">int</font> width, <font color="#7F0055">int</font> height);
	<font color="#7F0055">static final native void</font> setPosition (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> position);
	<font color="#7F0055">static final native int</font> getPosition (<font color="#7F0055">int</font> handle);
	<font color="#7F0055">static final native void</font> setMaximum (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> max);
	<font color="#7F0055">static final native int</font> getMaximum (<font color="#7F0055">int</font> handle);
	<font color="#7F0055">static final native void</font> setMinimum (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> min);
	<font color="#7F0055">static final native int</font> getMinimum (<font color="#7F0055">int</font> handle);
	<font color="#7F0055">static final native void</font> setFont (<font color="#7F0055">int</font> handle, <font color="#7F0055">int</font> hFont);
	<font color="#7F0055">static final native void</font> setFocus (<font color="#7F0055">int</font> handle);
	}
	</pre>
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