в 17:44, 31 мая 2010

2010-05-31T17:44:26Z

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2010-05-31T15:20:29Z

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== Add Image to Button ==

To get and set a button"s image label, use the following method



<source lang="java">
public Image getImage()
public void setImage(Image image)</source>



== Add Radio Buttons to a Composite to form a group ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class RadioButtonComposite {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
Composite composite = new Composite(shell, SWT.NULL);
composite.setLayout(new RowLayout());
Button mrButton = new Button(composite, SWT.RADIO);
mrButton.setText("Mr.");
Button mrsButton = new Button(composite, SWT.RADIO);
mrsButton.setText("Mrs.");
Button msButton = new Button(composite, SWT.RADIO);
msButton.setText("Ms.");
Button drButton = new Button(composite, SWT.RADIO);
drButton.setText("Dr.");
shell.open();
// Set up the event loop.
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
// If no more entries in event queue
display.sleep();
}
}
display.dispose();
}
}</source>



== ArrowButton ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class ArrowButtonExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
// Create three arrow buttons
new Button(shell, SWT.ARROW);
new Button(shell, SWT.ARROW | SWT.LEFT);
new Button(shell, SWT.ARROW | SWT.DOWN);

shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== CheckBox Button ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class CheckBoxButtonExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
// Create three checkboxes
new Button(shell, SWT.CHECK).setText("Checkbox 1");
new Button(shell, SWT.CHECK).setText("Checkbox 2");
new Button(shell, SWT.CHECK).setText("Checkbox 3");
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== FlatButton ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class FlatButtonExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
// Create three flat buttons
new Button(shell, SWT.FLAT).setText("Flat 1");
new Button(shell, SWT.FLAT).setText("Flat 2");
new Button(shell, SWT.FLAT).setText("Flat 3");

shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== Introducing Button and Button Styles ==

<OL><LI>SWT uses Button to represent checkboxes, toggle buttons, and radio buttons.</LI><LI>You determine the type by the style constants.</LI><LI>You may pass only one of SWT.LEFT, SWT.CENTER, or SWT.RIGHT.</LI><LI>You may pass only one of SWT.ARROW, SWT.CHECK, SWT.PUSH, SWT.RADIO, or SWT.TOGGLE.</LI><LI>If you pass SWT.ARROW, you may pass only one of SWT.UP, SWT.DOWN, SWT.LEFT, or SWT.RIGHT.</LI></OL>
StyleDescriptionSWT.ARROWCreates a push button that displays an arrow.SWT.CHECKCreates a checkbox.SWT.PUSHCreates a push button.SWT.RADIOCreates a radio button.SWT.TOGGLECreates a push button that preserves its pushed or nonpushed state.SWT.FLATCreates a push button that appears flat.SWT.UPWhen combined with SWT.ARROW, displays an upward-pointing arrow.SWT.DOWNWhen combined with SWT.ARROW, displays a downward-pointing arrow.SWT.CENTERCenters the associated text.SWT.LEFTLeft-aligns the associated text. When combined with SWT.ARROW, displays a leftward-pointing arrow.SWT.RIGHTRight-aligns the associated text. When combined with SWT.ARROW, displays a rightward-pointing arrow.

== LEFT, RIGHT, CENTER: These three styles specify the text/image alignment in buttons. ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ButtonTextAlignment {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display, SWT.SHELL_TRIM);
shell.setLayout(new FillLayout());
Button button = new Button(shell, SWT.RIGHT);
button.setText("text on the button");
shell.open();
// Set up the event loop.
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
// If no more entries in event queue
display.sleep();
}
}
display.dispose();
}
}</source>



== Push Button ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class PushButtonExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
// Create three push buttons
new Button(shell, SWT.PUSH).setText("Push 1");
new Button(shell, SWT.PUSH).setText("Push 2");
new Button(shell, SWT.PUSH).setText("Push 3");
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== RadioButton ==

By default all the radio buttons sharing the same parent belong to the same group.



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class RadioButtonExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
// Create three radio buttons
new Button(shell, SWT.RADIO).setText("Radio 1");
new Button(shell, SWT.RADIO).setText("Radio 2");
new Button(shell, SWT.RADIO).setText("Radio 3");

shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== Select a Radio Button ==

If you need to select a button programmatically, use the following method:



<source lang="java">
public void setSelection(boolean selected)</source>



== Set the alignment of the text/image label of a button ==

Set the alignment of the text/image label of a button in the constructor of the Button class, or you can use the setAlignment method after it has been created:



<source lang="java">
public void setAlignment(int alignment)</source>



== Setting Button selection ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ButtonSelection {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());

for (int i = 0; i < 20; i++) {
Button button = new Button(shell, SWT.TOGGLE);
button.setText("B" + i);
}
Control[] children = shell.getChildren();
for (int i = 0; i < children.length; i++) {
Control child = children[i];
((Button) child).setSelection(true);
}
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== To escape the mnemonic character &, you can double it and a single "&" will be displayed. ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class EscapeMnemonicCharacter {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display, SWT.SHELL_TRIM);
shell.setLayout(new RowLayout());
Button button = new Button(shell, SWT.RIGHT);
button.setText("&&text on the button");
shell.open();
// Set up the event loop.
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
// If no more entries in event queue
display.sleep();
}
}
display.dispose();
}
}</source>



== To get and set a button"s text label ==



<source lang="java">
public String getText()
public void setText(String text)</source>



== Toggle Button ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class ToggleButtonExample {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
// Create three toggle buttons
new Button(shell, SWT.TOGGLE).setText("Toggle 1");
new Button(shell, SWT.TOGGLE).setText("Toggle 2");
new Button(shell, SWT.TOGGLE).setText("Toggle 3");
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== You can include the mnemonic character in the text label. ==

Inserting an ampersand (&) before a character makes the character the mnemonic.



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ButtonAmpersandCharacter {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display, SWT.SHELL_TRIM);
shell.setLayout(new RowLayout());
Button button = new Button(shell, SWT.RIGHT);
button.setText("&text on the button");
shell.open();
// Set up the event loop.
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
// If no more entries in event queue
display.sleep();
}
}
display.dispose();
}
}</source>



When the user presses a key matching the mnemonic, the corresponding button is selected and a selection event is generated as a result.

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в 17:44, 31 мая 2010

Admin: 1 версия