Home » Eclipse Projects » JFace » Databinding with Enum + Combo
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| Re: Databinding with Enum + Combo [message #6195 is a reply to message #6152] |
Fri, 15 May 2009 19:42   |
Eclipse User |
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Originally posted by: fakemail.xyz.de
This is a multi-part message in MIME format.
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Boris Bokowski schrieb:
> Hi Charlie,
>
> Not that I am aware of, but if you could contribute one that would be great.
> Currently, the snippets/examples plug-in does not use Java 1.5 features but
> we would change that as soon as we add snippets dealing with enums,
> generics, etc.
>
> http://wiki.eclipse.org/JFace_Data_Binding/How_to_Contribute
>
> Boris
>
> "Charlie Kelly" <Eclipse@CharlieKelly.com> wrote in message
> news:guik5e$c2n$1@build.eclipse.org...
>> Are there any examples/snippets available for databinding with a enum and
>> a Combo?
>>
>> Thanks
>>
>> Charlie
>
>
I once implemented a Simple one .. may be its enough for you..
--------------050409030108030606030603
Content-Type: text/java;
name="ComboBoxViewer.java"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="ComboBoxViewer.java"
package uihelpers;
import helpers.GH;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.swt.widgets.Combo;
public class ComboBoxViewer<T> {
private final List<T> items;
private final Combo combo;
public ComboBoxViewer(Combo combo,T[] items) {
this(combo,Arrays.asList(items));
}
public ComboBoxViewer(Combo combo, List<T> items) {
this(combo,items, false);
}
/**
*
* @param combo - the combo for which this viewer is
* @param items - the items that can be choosen
* @param addEmptyItem - if an additional empty item should be added "no item selected"
*/
public ComboBoxViewer(Combo combo, List<T> items,boolean addEmptyItem) {
this.combo = combo;
this.items = new ArrayList<T>(items);
if (addEmptyItem) {
this.items.add(0, null);
}
for (T t: this.items) {
combo.add(get(t));
}
}
/**
* selects the given item in the ComboBox
*
* @param t - one item that is presenting the list
* throws IllegalArgumentException if not in the list.
*/
public void select(T t) {
int i = items.indexOf(t);
if (i == -1) {
throw new IllegalArgumentException();
} else {
combo.select(i);
}
}
/**
* selects the first item that will return the same string
* @param s
*/
public void selectByString(String s) {
for (T t : items) {
if ( GH.isNullOrEmpty(s) ? GH.isNullOrEmpty(get(t)) : s.equals(get(t))) {
select(t);
}
}
}
private String get(T t) {
if (t == null) {
return "";
}else {
return getShown(t);
}
}
/**
*
* @param t - an item that should be presented
* implementing classes should override this method..
*
* @return bhy default toString() is returned
*/
protected String getShown(T t) {
return t.toString();
}
/**
*
* @return the currently selected item
*/
public T getSelected() {
int i = combo.getSelectionIndex();
if (i != -1) {
return items.get(i);
}
return null;
}
public String getSelectedString() {
return get(getSelected());
}
}
--------------050409030108030606030603
Content-Type: text/java;
name="GH.java"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="GH.java"
package helpers;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.util.Collection;
import java.util.Random;
import javax.swing.filechooser.FileSystemView;
/**
* Global Helpers that are useful for everyone..
*
* @author Quicksilver
*
*/
public final class GH {
private static final Random rand = new Random();
private static final FileSystemView chooser = FileSystemView.getFileSystemView();
/*
*
* @see java.util.Random#nextInt(int)
*/
public static int nextInt(int n) {
synchronized(rand) {
return rand.nextInt(n);
}
}
public static int nextInt() {
synchronized(rand) {
return rand.nextInt();
}
}
private GH() {}
/**
* provided for all the might use it..
* as creating costs memory that is never recovered..
* @return a FileSytemView instance..
*/
public static FileSystemView getFileSystemView() {
return chooser;
}
/**
* emulates behaviour of FileSystemView as good as possible...
* though its not the same..
* -> done as normal FileSystemView has a memory leak on that method..
*/
public static File[] getFiles(File parent,boolean useHidden) {
File[] files = parent.listFiles();
if (files == null) return new File[0];
if (useHidden) {
// int length = files.length;
int k = 0;
for (int i = 0; i+k < files.length; i++) {
while (i+k < files.length && files[i+k].isHidden()) {
k++;
}
if (i+k < files.length) {
files[i] = files[i+k];
}
}
if (k != 0) {
File[] onlyVisible = new File[files.length - k];
System.arraycopy(files, 0, onlyVisible, 0, onlyVisible.length );
return onlyVisible;
}
}
return files;
}
/**
* closes all provided streams ignoring exceptions
* @param closeable
*/
public static void close(Closeable... closeable) {
for (Closeable c: closeable) {
try {
if (c != null) {
c.close();
}
} catch (IOException e) {
} catch (RuntimeException e) {
e.printStackTrace();
}
}
}
/**
* sleeps ignoring interruption handling..
*
* @param millis - how long to sleep
*/
public static void sleep(long millis) {
try {
Thread.sleep(millis);
} catch(InterruptedException ie) {}
}
/**
* replaces invalid characters in Filenames
*/
public static String replaceInvalidFilename(String filename) {
filename = filename.replace("\\", ".");
filename = filename.replace("/", ".");
filename = filename.replace("*", ".");
filename = filename.replace("?", ".");
filename = filename.replace("\"", "\'");
filename = filename.replace("<", ".");
filename = filename.replace(">", ".");
filename = filename.replace("|", ".");
filename = filename.replace(":", "-");
return filename;
}
/**
* replaces invalid filepath
*/
public static String replaceInvalidFilpath(String filename) {
filename = filename.replace(File.separator.equals("\\")?"/": "\\", ".");
filename = filename.replace("*", ".");
filename = filename.replace("?", ".");
filename = filename.replace("\"", "\'");
filename = filename.replace("<", ".");
filename = filename.replace(">", ".");
filename = filename.replace("|", ".");
filename = filename.replace(":", "-");
return filename;
}
/**
* replaces newline characters with \n
* and \ with \\
*
* so it does basic escaping
*
* @param s
* @return
*/
public static String replaces(String s) {
s = s.replace("\\", "\\\\");
s = s.replace("\n", "\\n");
return s;
}
/**
* reverses replacements of replace function
*/
public static String revReplace(String s) {
int i = 0;
while ((i = s.indexOf('\\',i)) != -1) {
if (s.length() > i+1) {
char c = s.charAt(i+1);
if (c == '\\') {
s = s.substring(0, i)+"\\"+s.substring(i+2) ;
} else if (c == 'n') {
s = s.substring(0, i)+"\n"+s.substring(i+2);
}
}
i++;
}
return s;
}
public static boolean isLocaladdress(InetAddress ia) {
return ia.isLoopbackAddress()|| ia.isSiteLocalAddress();
}
public static String getStacktrace(Thread t) {
String s = t.getName();
for (StackTraceElement ste:t.getStackTrace()) {
s += "\n"+ste.getFileName()+" Line:"+ste.getLineNumber()+" "+ste.getMethodName();
}
return s;
}
public static boolean isEmpty(String s) {
return s.length() == 0;
}
public static boolean isNullOrEmpty(String s) {
return s == null || s.length() == 0;
}
public static String toString(Object[] arr) {
if (arr == null) {
return "null";
}
if (arr.length == 0) {
return "{empty}";
}
String s = "";
for (Object o:arr) {
s+=","+o.toString();
}
return "{"+s.substring(1)+"}";
}
public static byte[] concatenate(byte[]... arrays) {
int totalsize= 0;
for (byte[] array: arrays) {
totalsize += array.length;
}
byte[] all = new byte[totalsize];
int currentpos = 0;
for (byte[] array: arrays) {
System.arraycopy(array, 0, all, currentpos, array.length);
currentpos += array.length;
}
return all;
}
public static int compareTo(int a , int b) {
return (a < b ? -1 : (a==b ? 0 : 1));
}
public static int compareTo(byte a , byte b) {
return (a < b ? -1 : (a==b ? 0 : 1));
}
public static int unsingedCompareTo(byte a,byte b) {
return compareTo(a & 0xff , b & 0xff);
}
/**
* concatenates each term in collection using .toString()
* and puts between each string "between"
*
* if the map is empty it will return the empty map string instead...
*
* prefix and postfix are applied around everything..
*/
public static String concat(Collection<?> terms,String between,String emptyMap) {
String ret = null;
for (Object o: terms) {
if (ret != null) {
ret += between+o.toString();
} else {
ret = o.toString();
}
}
if (ret == null) {
return emptyMap;
} else {
return ret;
}
}
}
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| Re: Databinding with Enum + Combo [message #6209 is a reply to message #6195] |
Fri, 15 May 2009 19:44 |
| Eclipse User |
|
|
|
Originally posted by: fakemail.xyz.de
Christian schrieb:
> Boris Bokowski schrieb:
>> Hi Charlie,
>>
>> Not that I am aware of, but if you could contribute one that would be
>> great. Currently, the snippets/examples plug-in does not use Java 1.5
>> features but we would change that as soon as we add snippets dealing
>> with enums, generics, etc.
>>
>> http://wiki.eclipse.org/JFace_Data_Binding/How_to_Contribute
>>
>> Boris
>>
>> "Charlie Kelly" <Eclipse@CharlieKelly.com> wrote in message
>> news:guik5e$c2n$1@build.eclipse.org...
>>> Are there any examples/snippets available for databinding with a enum
>>> and a Combo?
>>>
>>> Thanks
>>>
>>> Charlie
>>
>>
>
> I once implemented a Simple one .. may be its enough for you..
>
>
>
>
>
>
Ah I think I misread you .. though you were looking for some kind of
viewer...
sry..
|
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| Re: Databinding with Enum + Combo [message #6224 is a reply to message #6152] |
Fri, 15 May 2009 20:58 |
| Eclipse User |
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|
|
Originally posted by: eclipse-news.rizzoweb.com
This is a multi-part message in MIME format.
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Attached is a snippet that demonstrates binding an enum to a
ComboViewer. It's pretty simple once you see the keys.
Boris, I've got a patch for the snippets project with this. What
specifics (Project, Component, subject prefix, etc) should I use to
enter the Bugzilla?
Eric
Boris Bokowski wrote:
> Hi Charlie,
>
> Not that I am aware of, but if you could contribute one that would be great.
> Currently, the snippets/examples plug-in does not use Java 1.5 features but
> we would change that as soon as we add snippets dealing with enums,
> generics, etc.
>
> http://wiki.eclipse.org/JFace_Data_Binding/How_to_Contribute
>
> Boris
>
> "Charlie Kelly" <Eclipse@CharlieKelly.com> wrote in message
> news:guik5e$c2n$1@build.eclipse.org...
>> Are there any examples/snippets available for databinding with a enum and
>> a Combo?
>>
>> Thanks
>>
>> Charlie
>
>
--------------010704090406010009050409
Content-Type: text/plain;
name="Snippet034ComboViewerAndEnum.java"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="Snippet034ComboViewerAndEnum.java"
/*********************************************************** ********************
* Copyright (c) 2009 Eric Rizzo and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eric Rizzo - initial API and implementation
************************************************************ ******************/
package org.eclipse.jface.examples.databinding.snippets;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.PojoObservables;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.value.IObservableVal ue;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.databinding.viewers.ViewersObservables;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Snippet034ComboViewerAndEnum {
public static void main(String[] args) {
Display display = new Display();
final Person model = new Person("Pat", Gender.Unknown);
Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
public void run() {
final Shell shell = new View(model).createShell();
// The SWT event loop
Display display = Display.getCurrent();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
});
// Print the results
System.out.println("person.getName() = " + model.getName());
System.out.println("person.getGender() = " + model.getGender());
}
static enum Gender {
Male, Female, Unknown;
}
// The data model class. This is normally a persistent class of some sort.
//
// In this example, we only push changes from the GUI to the model, so we
// don't worry about implementing JavaBeans bound properties. If we need
// our GUI to automatically reflect changes in the Person object, the
// Person object would need to implement the JavaBeans property change
// listener methods.
static class Person {
// A property...
String name;
Gender gender;
public Person(String name, Gender gender) {
this.name = name;
this.gender = gender;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Gender getGender() {
return gender;
}
public void setGender(Gender newGender) {
this.gender = newGender;
}
}
// The GUI view
static class View {
private Person viewModel;
private Text name;
private ComboViewer gender;
public View(Person viewModel) {
this.viewModel = viewModel;
}
public Shell createShell() {
// Build a UI
Display display = Display.getDefault();
Shell shell = new Shell(display);
RowLayout layout = new RowLayout(SWT.VERTICAL);
layout.fill = true;
layout.marginWidth = layout.marginHeight = 5;
shell.setLayout(layout);
name = new Text(shell, SWT.BORDER);
gender = new ComboViewer(shell, SWT.READ_ONLY);
// Here's the first key to binding a combo to an Enum:
// First give it an ArrayContentProvider,
// then set the input to the list of values from the Enum.
gender.setContentProvider(ArrayContentProvider.getInstance() );
gender.setInput(Gender.values());
// Bind the fields
DataBindingContext bindingContext = new DataBindingContext();
IObservableValue widgetObservable = SWTObservables.observeText(
name, SWT.Modify);
bindingContext.bindValue(widgetObservable, PojoObservables
.observeValue(viewModel, "name"));
// The second key to binding a combo to an Enum is to use a
// selection observable from the ComboViewer:
widgetObservable = ViewersObservables
.observeSingleSelection(gender);
bindingContext.bindValue(widgetObservable, PojoObservables
.observeValue(viewModel, "gender"));
// Open and return the Shell
shell.pack();
shell.open();
return shell;
}
}
}
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| Re: Databinding with Enum + Combo [message #6254 is a reply to message #6224] |
Sat, 16 May 2009 18:26 |
 Charlie Kelly
Messages: 276
Registered: July 2009 |
Senior Member |
|
|
Eric Rizzo wrote:
> Attached is a snippet that demonstrates binding an enum to a
> ComboViewer. It's pretty simple once you see the keys.
>
> Boris, I've got a patch for the snippets project with this. What
> specifics (Project, Component, subject prefix, etc) should I use to
> enter the Bugzilla?
>
> Eric
>
Hi Eric,
Thanks for the snippet. The "keys" are particularly helpful.
Boris, given that this snippet is available, would you like me to create
an additional snippet?
Charlie
> Boris Bokowski wrote:
>> Hi Charlie,
>>
>> Not that I am aware of, but if you could contribute one that would be
>> great. Currently, the snippets/examples plug-in does not use Java 1.5
>> features but we would change that as soon as we add snippets dealing
>> with enums, generics, etc.
>>
>> http://wiki.eclipse.org/JFace_Data_Binding/How_to_Contribute
>>
>> Boris
>>
>> "Charlie Kelly" <Eclipse@CharlieKelly.com> wrote in message
>> news:guik5e$c2n$1@build.eclipse.org...
>>> Are there any examples/snippets available for databinding with a enum
>>> and a Combo?
>>>
>>> Thanks
>>>
>>> Charlie
>>
>>
>
|
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