- Adds the listener to in Java

Encode Data Matrix in Java - Adds the listener to
- Adds the listener to
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the collection of listeners who will be notified when the control is selected, by sending it one of the messages defined in the SelectionListener interface
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getSelection()
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- Returns true if the receiver is selected, and
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false otherwise
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setAlignment(int)
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- Controls how text, images and arrows will
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be displayed in the receiver
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setImage(Image)
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- Sets the receiver's image to the argument,
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SWT Widgets
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which may be null indicating that no image should be displayed
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setSelection(boolean)
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- Sets the selection state of the receiver,
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if it is of type SWTCHECK, SWTRADIO, or SWTTOGGLE
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setText(String)
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- Sets the receiver's text
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Useful creation styles include:
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SWTARROW
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- Creates an arrow button widget - Creates a check box widget
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SWTCHECK
SWTPUSH
- Creates a push button widget - Creates a radio button widget - Creates a toggle button widget
SWTRADIO
SWTTOGGLE
SWTUP
- Creates upward pointing arrow button - Creates downward pointing arrow button - Creates leftward pointing arrow button or left-
SWTDOWN
SWTLEFT
justifies the widget within its bounding box
SWTRIGHT
- Creates rightward pointing arrow button or right-
TT 4 The Simple Widget Toolkit
justifies the widget within its bounding box
SWTCENTER
- Centers the widget within its bounding box
The following example (shown without import or package statements) creates a window with a single push button Clicking on the push button will change the text of the button (see Figure 4-5)
Figure 4-5
import import import import
Button Example
orgeclipseswt*; orgeclipseswtevents*; orgeclipseswtlayout*; orgeclipseswtwidgets*;
public class ButtonExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Button Example"); shellsetBounds(100, 100, 200, 100); shellsetLayout(new FillLayout()); final Button button = new Button(shell, SWTPUSH); buttonsetText("Click Me Now"); buttonaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) {
SWT Widgets
buttonsetText("I Was Clicked"); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }
Relative to the first example in this chapter, the interesting lines in the above example are highlighted in bold After the creation of the button, a selection listener is added in which a SelectionAdapter is created that overrides the widgetSelected() method
Text
Text widgets provide text viewing and editing capabilities If the user types more text than can be accommodated within the widget, it will automatically scroll Useful APIs include:
addModifyListener(ModifyListener)
- Adds the listener to the
collection of listeners who will be notified when the receiver's text is modified, by sending it one of the messages
TT 4 The Simple Widget Toolkit
defined in the ModifyListener interface
addSelectionListener(SelectionListener) -
Adds the listener to
the collection of listeners who will be notified when the control is selected, by sending it one of the messages defined in the SelectionListener interface
addVerifyListener(VerifyListener)
- Adds the listener to the
collection of listeners who will be notified when the receiver's text is verified, by sending it one of the messages defined in the VerifyListener interface
clearSelection()
- Clears the selection
copy()
- Copies the selected text
cut()
- Cuts the selected text - Gets the selected text
getSelectionText()
getText()
- Gets the widget text - Gets a range of text
getText(int start, int end)
insert(String)
- Inserts a string
paste()
- Pastes text from clipboard
SWT Widgets
selectAll()
- Selects all the text in the receiver - Sets the echo character - Sets the editable state - Sets the selection
setEchoChar(char echo)
setEditable(boolean editable)
setSelection(int start, int end)
setText(String)
- Sets the contents of the receiver to the given
string
setTextLimit(int)
- Sets the maximum number of characters
that the receiver is capable of holding to be the argument
setTopIndex(int)
- Sets the zero-relative index of the line
which is currently at the top of the receiver
Useful creation styles include:
SWTSINGLE
- Creates a single line text widget
SWTMULTI
- Creates a multilane text widget
SWTWRAP
- Causes the text of widget to wrap onto multiple
lines, if necessary
SWTREAD_ONLY
- Creates read-only text widget which cannot be
TT 4 The Simple Widget Toolkit
edited
SWTLEFT
- Creates a left-justified text widget - Creates a right-justifies text the widget - Creates a center-justifies text the widget
SWTRIGHT
SWTCENTER
The following example creates a window frame with a single multi-line text field The field will only allow digits (0-9) to be entered (see Figure 46)
Figure 4-6
import import import import
Text Example
orgeclipseswt*; orgeclipseswtevents*; orgeclipseswtlayout*; orgeclipseswtwidgets*;
public class TextExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Text Example"); shellsetBounds(100, 100, 200, 100); shellsetLayout(new FillLayout()); final Text text = new Text(shell, SWTMULTI); textaddVerifyListener(new VerifyListener() {
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public void verifyText(VerifyEvent event) { eventdoit = eventtextlength() == 0 || CharacterisDigit(eventtextcharAt(0)); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }
As with the prior example, interesting lines are highlighted in bold After the creation of the text widget, a verify listener is added in which a VerifyListener
is created that overrides the verifyText() method to verify that
the character entered is a digit Note that, if the user deletes or backspaces over some text, the eventtext will be empty
4264 List
List widgets present a list of items and allow the user to select one or more items from the list Lists generate a Selection event when an item is selected Useful APIs include:
add(String)
- Adds the argument to the end of the receiver's
list
TT 4 The Simple Widget Toolkit
addSelectionListener(SelectionListener)
- Adds the listener to
the collection of listeners who will be notified when the receiver's selection changes, by sending it one of the messages defined in the SelectionListener interface
deselect(int)
- Deselects the item at the given zero-relative in-