Combo (Eclipse RAP 3.1.0-SNAPSHOT API Reference)

java.lang.Object
- org.eclipse.swt.widgets.Widget
- - org.eclipse.swt.widgets.Control
  - - org.eclipse.swt.widgets.Scrollable
    - - org.eclipse.swt.widgets.Composite
      - org.eclipse.swt.widgets.Combo

All Implemented Interfaces:

Adaptable, Drawable
```
public class Combo
extends Composite
```
Instances of this class are controls that allow the user to choose an item from a list of items, or optionally enter a new value by typing it into an editable text field. Often, Combos are used in the same place where a single selection List widget could be used but space is limited. A Combo takes less space than a List widget and shows similar information.
Note: Since Combos can contain both a list and an editable text field, it is possible to confuse methods which access one versus the other (compare for example, clearSelection() and deselectAll()). The API documentation is careful to indicate either "the receiver's list" or the "the receiver's text field" to distinguish between the two cases.
Note that although this class is a subclass of Composite, it does not make sense to add children to it, or set a layout on it.

Styles:

DROP_DOWN, READ_ONLY

Events:

DefaultSelection, Modify, Selection

IMPORTANT: This class is not intended to be subclassed.

Since:

1.0

See Also:

List

Field Summary

Fields
Modifier and Type Field and Description

static int LIMIT
The maximum number of characters that can be entered into a text widget.

Fields
Modifier and Type	Field and Description
`static int`	`LIMIT` The maximum number of characters that can be entered into a text widget.

Constructor Summary

Constructors
Constructor and Description
`Combo(Composite parent, int style)` Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`add(java.lang.String string)` Adds the argument to the end of the receiver's list.
`void`	`add(java.lang.String string, int index)` Adds the argument to the receiver's list at the given zero-relative index.
`void`	`addModifyListener(ModifyListener listener)` 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 defined in the `ModifyListener` interface.
`void`	`addSelectionListener(SelectionListener listener)` 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.
`void`	`addVerifyListener(VerifyListener listener)` 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.
`void`	`clearSelection()` Sets the selection in the receiver's text field to an empty selection starting just before the first character.
`Point`	`computeSize(int wHint, int hHint, boolean changed)` Returns the preferred size of the receiver.
`void`	`deselect(int index)` Deselects the item at the given zero-relative index in the receiver's list.
`void`	`deselectAll()` Deselects all selected items in the receiver's list.
`<T> T`	`getAdapter(java.lang.Class<T> adapter)` Implementation of the `Adaptable` interface.
`java.lang.String`	`getItem(int index)` Returns the item at the given, zero-relative index in the receiver's list.
`int`	`getItemCount()` Returns the number of items contained in the receiver's list.
`int`	`getItemHeight()` Returns the height of the area which would be used to display one of the items in the receiver's list.
`java.lang.String[]`	`getItems()` Returns a (possibly empty) array of `String`s which are the items in the receiver's list.
`boolean`	`getListVisible()` Returns `true` if the receiver's list is visible, and `false` otherwise.
`Point`	`getSelection()` Returns a `Point` whose x coordinate is the character position representing the start of the selection in the receiver's text field, and whose y coordinate is the character position representing the end of the selection.
`int`	`getSelectionIndex()` Returns the zero-relative index of the item which is currently selected in the receiver's list, or -1 if no item is selected.
`java.lang.String`	`getText()` Returns a string containing a copy of the contents of the receiver's text field, or an empty string if there are no contents.
`int`	`getTextHeight()` Returns the height of the receivers's text field.
`int`	`getTextLimit()` Returns the maximum number of characters that the receiver's text field is capable of holding.
`int`	`getVisibleItemCount()` Gets the number of items that are visible in the drop down portion of the receiver's list.
`int`	`indexOf(java.lang.String string)` Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item.
`int`	`indexOf(java.lang.String string, int start)` Searches the receiver's list starting at the given, zero-relative index until an item is found that is equal to the argument, and returns the index of that item.
`void`	`remove(int index)` Removes the item from the receiver's list at the given zero-relative index.
`void`	`remove(int start, int end)` Removes the items from the receiver's list which are between the given zero-relative start and end indices (inclusive).
`void`	`remove(java.lang.String string)` Searches the receiver's list starting at the first item until an item is found that is equal to the argument, and removes that item from the list.
`void`	`removeAll()` Removes all of the items from the receiver's list and clear the contents of receiver's text field.
`void`	`removeModifyListener(ModifyListener listener)` Removes the listener from the collection of listeners who will be notified when the receiver's text is modified.
`void`	`removeSelectionListener(SelectionListener listener)` Removes the listener from the collection of listeners who will be notified when the receiver's selection changes.
`void`	`removeVerifyListener(VerifyListener listener)` Removes the listener from the collection of listeners who will be notified when the control is verified.
`void`	`select(int selectionIndex)` Selects the item at the given zero-relative index in the receiver's list.
`void`	`setItem(int index, java.lang.String string)` Sets the text of the item in the receiver's list at the given zero-relative index to the string argument.
`void`	`setItems(java.lang.String... items)` Sets the receiver's list to be the given array of items.
`void`	`setListVisible(boolean visible)` Marks the receiver's list as visible if the argument is `true`, and marks it invisible otherwise.
`void`	`setSelection(Point selection)` Sets the selection in the receiver's text field to the range specified by the argument whose x coordinate is the start of the selection and whose y coordinate is the end of the selection.
`void`	`setText(java.lang.String string)` Sets the contents of the receiver's text field to the given string.
`void`	`setTextLimit(int limit)` Sets the maximum number of characters that the receiver's text field is capable of holding to be the argument.
`void`	`setVisibleItemCount(int count)` Sets the number of items that are visible in the drop down portion of the receiver's list.

Methods inherited from class org.eclipse.swt.widgets.Composite
changed, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayout, setLayoutDeferred, setTabList

Methods inherited from class org.eclipse.swt.widgets.Scrollable
computeTrim, getClientArea, getHorizontalBar, getVerticalBar

Methods inherited from class org.eclipse.swt.widgets.Control
addControlListener, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addTouchListener, addTraverseListener, computeSize, forceFocus, getAccessible, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getOrientation, getParent, getShell, getSize, getToolTipText, getTouchEnabled, getVisible, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, redraw, redraw, removeControlListener, removeDragDetectListener, removeFocusListener, removeGestureListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeTouchListener, removeTraverseListener, requestLayout, setBackground, setBackgroundImage, setBounds, setBounds, setCursor, setData, setEnabled, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setOrientation, setParent, setRedraw, setSize, setSize, setToolTipText, setTouchEnabled, setVisible, toControl, toControl, toDisplay, toDisplay, update

Methods inherited from class org.eclipse.swt.widgets.Widget
addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - LIMIT
```
public static final int LIMIT
```
    The maximum number of characters that can be entered into a text widget.
    
    Since:
    
    1.3
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Combo
```
public Combo(Composite parent,
             int style)
```
    Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.
    The style value is either one of the style constants defined in class SWT which is applicable to instances of this class, or must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those SWT style constants. The class description lists the style constants that are applicable to the class. Style bits are also inherited from superclasses.
    Parameters:
    
    parent - a composite control which will be the parent of the new instance (cannot be null)
    
    style - the style of control to construct
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the parent is null
    SWTException -
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
    
    ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
    See Also:
    
    SWT.DROP_DOWN, SWT.READ_ONLY, SWT.SIMPLE, Widget.checkSubclass(), Widget.getStyle()
- Method Detail
  - getSelectionIndex
```
public int getSelectionIndex()
```
    Returns the zero-relative index of the item which is currently selected in the receiver's list, or -1 if no item is selected.
    Returns:
    
    the index of the selected item
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - select
```
public void select(int selectionIndex)
```
    Selects the item at the given zero-relative index in the receiver's list. If the item at the index was already selected, it remains selected. Indices that are out of range are ignored.
    Parameters:
    
    selectionIndex - the index of the item to select
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - deselect
```
public void deselect(int index)
```
    Deselects the item at the given zero-relative index in the receiver's list. If the item at the index was already deselected, it remains deselected. Indices that are out of range are ignored.
    Parameters:
    
    index - the index of the item to deselect
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - deselectAll
```
public void deselectAll()
```
    Deselects all selected items in the receiver's list.
    Note: To clear the selection in the receiver's text field, use clearSelection().
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    clearSelection()
  - setSelection
```
public void setSelection(Point selection)
```
    Sets the selection in the receiver's text field to the range specified by the argument whose x coordinate is the start of the selection and whose y coordinate is the end of the selection.
    Parameters:
    
    selection - a point representing the new selection start and end
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the point is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
  - getSelection
```
public Point getSelection()
```
    Returns a Point whose x coordinate is the character position representing the start of the selection in the receiver's text field, and whose y coordinate is the character position representing the end of the selection. An "empty" selection is indicated by the x and y coordinates having the same value.
    Indexing is zero based. The range of a selection is from 0..N where N is the number of characters in the widget.
    Returns:
    
    a point representing the selection start and end
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
  - clearSelection
```
public void clearSelection()
```
    Sets the selection in the receiver's text field to an empty selection starting just before the first character. If the text field is editable, this has the effect of placing the i-beam at the start of the text.
    Note: To clear the selected items in the receiver's list, use deselectAll().
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
    
    See Also:
    
    deselectAll()
  - add
```
public void add(java.lang.String string)
```
    Adds the argument to the end of the receiver's list.
    Parameters:
    
    string - the new item
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the string is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    add(String,int)
  - add
```
public void add(java.lang.String string,
                int index)
```
    Adds the argument to the receiver's list at the given zero-relative index.
    Note: To add an item at the end of the list, use the result of calling getItemCount() as the index or use add(String).
    Parameters:
    
    string - the new item
    
    index - the index for the item
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the string is null
    
    ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list (inclusive)
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    add(String)
  - remove
```
public void remove(int index)
```
    Removes the item from the receiver's list at the given zero-relative index.
    Parameters:
    
    index - the index for the item
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - remove
```
public void remove(int start,
                   int end)
```
    Removes the items from the receiver's list which are between the given zero-relative start and end indices (inclusive).
    Parameters:
    
    start - the start of the range
    
    end - the end of the range
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_INVALID_RANGE - if either the start or end are not between 0 and the number of elements in the list minus 1 (inclusive)
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - remove
```
public void remove(java.lang.String string)
```
    Searches the receiver's list starting at the first item until an item is found that is equal to the argument, and removes that item from the list.
    Parameters:
    
    string - the item to remove
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the string is null
    
    ERROR_INVALID_ARGUMENT - if the string is not found in the list
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - removeAll
```
public void removeAll()
```
    Removes all of the items from the receiver's list and clear the contents of receiver's text field.
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - setItem
```
public void setItem(int index,
                    java.lang.String string)
```
    Sets the text of the item in the receiver's list at the given zero-relative index to the string argument. This is equivalent to removing the old item at the index, and then adding the new item at that index.
    Parameters:
    
    index - the index for the item
    
    string - the new text for the item
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
    
    ERROR_NULL_ARGUMENT - if the string is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - setItems
```
public void setItems(java.lang.String... items)
```
    Sets the receiver's list to be the given array of items.
    Parameters:
    
    items - the array of items
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the items array is null
    
    ERROR_INVALID_ARGUMENT - if an item in the items array is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - getItem
```
public java.lang.String getItem(int index)
```
    Returns the item at the given, zero-relative index in the receiver's list. Throws an exception if the index is out of range.
    Parameters:
    
    index - the index of the item to return
    
    Returns:
    
    the item at the given index
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - getItems
```
public java.lang.String[] getItems()
```
    Returns a (possibly empty) array of Strings which are the items in the receiver's list.
    Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.
    Returns:
    
    the items in the receiver's list
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - getItemCount
```
public int getItemCount()
```
    Returns the number of items contained in the receiver's list.
    Returns:
    
    the number of items
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - getItemHeight
```
public int getItemHeight()
```
    Returns the height of the area which would be used to display one of the items in the receiver's list.
    Returns:
    
    the height of one item
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
  - setVisibleItemCount
```
public void setVisibleItemCount(int count)
```
    Sets the number of items that are visible in the drop down portion of the receiver's list.
    Note: This operation is a hint and is not supported on platforms that do not have this concept.
    Parameters:
    
    count - the new number of items to be visible
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - getVisibleItemCount
```
public int getVisibleItemCount()
```
    Gets the number of items that are visible in the drop down portion of the receiver's list.
    Note: This operation is a hint and is not supported on platforms that do not have this concept.
    Returns:
    
    the number of items that are visible
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - setListVisible
```
public void setListVisible(boolean visible)
```
    Marks the receiver's list as visible if the argument is true, and marks it invisible otherwise.
    If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, marking it visible may not actually cause it to be displayed.
    Parameters:
    
    visible - the new visibility state
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
  - getListVisible
```
public boolean getListVisible()
```
    Returns true if the receiver's list is visible, and false otherwise.
    If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, this method may still indicate that it is considered visible even though it may not actually be showing.
    Returns:
    
    the receiver's list's visibility state
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
  - indexOf
```
public int indexOf(java.lang.String string)
```
    Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item. If no item is found, returns -1.
    Parameters:
    
    string - the search item
    
    Returns:
    
    the index of the item
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the string is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - indexOf
```
public int indexOf(java.lang.String string,
                   int start)
```
    Searches the receiver's list starting at the given, zero-relative index until an item is found that is equal to the argument, and returns the index of that item. If no item is found or the starting index is out of range, returns -1.
    Parameters:
    
    string - the search item
    
    start - the zero-relative index at which to begin the search
    
    Returns:
    
    the index of the item
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the string is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - getText
```
public java.lang.String getText()
```
    Returns a string containing a copy of the contents of the receiver's text field, or an empty string if there are no contents.
    Returns:
    
    the receiver's text
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - setText
```
public void setText(java.lang.String string)
```
    Sets the contents of the receiver's text field to the given string.
    Note: The text field in a Combo is typically only capable of displaying a single line of text. Thus, setting the text to a string containing line breaks or other special characters will probably cause it to display incorrectly.
    Parameters:
    
    string - the new text
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the string is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  - getTextLimit
```
public int getTextLimit()
```
    Returns the maximum number of characters that the receiver's text field is capable of holding. If this has not been changed by setTextLimit(), it will be the constant Combo.LIMIT.
    Returns:
    
    the text limit
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
    
    See Also:
    
    LIMIT
  - setTextLimit
```
public void setTextLimit(int limit)
```
    Sets the maximum number of characters that the receiver's text field is capable of holding to be the argument.
    To reset this value to the default, use setTextLimit(Combo.LIMIT). Specifying a limit value larger than Combo.LIMIT sets the receiver's limit to Combo.LIMIT.
    Parameters:
    
    limit - new text limit
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_CANNOT_BE_ZERO - if the limit is zero
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
    
    See Also:
    
    LIMIT
  - getTextHeight
```
public int getTextHeight()
```
    Returns the height of the receivers's text field.
    Returns:
    
    the text height
    
    Throws:
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    Since:
    
    1.3
  - computeSize
```
public Point computeSize(int wHint,
                         int hHint,
                         boolean changed)
```
    Description copied from class: Control
    
    Returns the preferred size of the receiver.
    The preferred size of a control is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask a control questions such as "Given a particular width, how high does the control need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant SWT.DEFAULT is passed for the hint.
    If the changed flag is true, it indicates that the receiver's contents have changed, therefore any caches that a layout manager containing the control may have been keeping need to be flushed. When the control is resized, the changed flag will be false, so layout manager caches can be retained.
    
    Overrides:
    
    computeSize in class Composite
    
    Parameters:
    
    wHint - the width hint (can be SWT.DEFAULT)
    
    hHint - the height hint (can be SWT.DEFAULT)
    
    changed - true if the control's contents have changed, and false otherwise
    
    Returns:
    
    the preferred size of the control.
    
    See Also:
    
    Layout, Control.getBorderWidth(), Control.getBounds(), Control.getSize(), Control.pack(boolean), "computeTrim, getClientArea for controls that implement them"
  - addSelectionListener
```
public void addSelectionListener(SelectionListener listener)
```
    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.
    widgetSelected is called when the combo's list selection changes. widgetDefaultSelected is typically called when ENTER is pressed the combo's text area.
    Parameters:
    
    listener - the listener which should be notified
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    SelectionListener, removeSelectionListener(org.eclipse.swt.events.SelectionListener), SelectionEvent
  - removeSelectionListener
```
public void removeSelectionListener(SelectionListener listener)
```
    Removes the listener from the collection of listeners who will be notified when the receiver's selection changes.
    Parameters:
    
    listener - the listener which should no longer be notified
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    SelectionListener, addSelectionListener(org.eclipse.swt.events.SelectionListener)
  - addModifyListener
```
public void addModifyListener(ModifyListener listener)
```
    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 defined in the ModifyListener interface.
    Parameters:
    
    listener - the listener which should be notified
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    ModifyListener, removeModifyListener(org.eclipse.swt.events.ModifyListener)
  - removeModifyListener
```
public void removeModifyListener(ModifyListener listener)
```
    Removes the listener from the collection of listeners who will be notified when the receiver's text is modified.
    Parameters:
    
    listener - the listener which should no longer be notified
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    ModifyListener, addModifyListener(org.eclipse.swt.events.ModifyListener)
  - addVerifyListener
```
public void addVerifyListener(VerifyListener listener)
```
    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.
    Parameters:
    
    listener - the listener which should be notified
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    VerifyListener, removeVerifyListener(org.eclipse.swt.events.VerifyListener)
  - removeVerifyListener
```
public void removeVerifyListener(VerifyListener listener)
```
    Removes the listener from the collection of listeners who will be notified when the control is verified.
    Parameters:
    
    listener - the listener which should no longer be notified
    
    Throws:
    java.lang.IllegalArgumentException -
    
    ERROR_NULL_ARGUMENT - if the listener is null
    SWTException -
    
    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    
    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
    See Also:
    
    VerifyListener, addVerifyListener(org.eclipse.swt.events.VerifyListener)
  - getAdapter
```
public <T> T getAdapter(java.lang.Class<T> adapter)
```
    Description copied from class: Widget
    
    Implementation of the Adaptable interface.
    IMPORTANT: This method is not part of the RWT public API. It is marked public only so that it can be shared within the packages provided by RWT. It should never be accessed from application code.
    
    Specified by:
    
    getAdapter in interface Adaptable
    
    Overrides:
    
    getAdapter in class Composite
    
    Parameters:
    
    adapter - the lookup class
    
    Returns:
    
    an object that can be cast to the given class or null if there is no adapter associated with the given class.

Class Combo

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.eclipse.swt.widgets.Composite

Methods inherited from class org.eclipse.swt.widgets.Scrollable

Methods inherited from class org.eclipse.swt.widgets.Control

Methods inherited from class org.eclipse.swt.widgets.Widget

Methods inherited from class java.lang.Object

Field Detail

LIMIT

Constructor Detail

Combo

Method Detail

getSelectionIndex

select

deselect

deselectAll

setSelection

getSelection

clearSelection

add

add

remove

remove

remove

removeAll

setItem

setItems

getItem

getItems

getItemCount

getItemHeight

setVisibleItemCount

getVisibleItemCount

setListVisible

getListVisible

indexOf

indexOf

getText

setText

getTextLimit

setTextLimit

getTextHeight

computeSize

addSelectionListener

removeSelectionListener

addModifyListener

removeModifyListener

addVerifyListener

removeVerifyListener

getAdapter