Eclipse Plug-in Developer Guide (Galileo) - CCombo (Eclipse Platform API Specification)

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Eclipse Platform
Release 3.5

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org.eclipse.swt.custom
Class CCombo


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.custom.CCombo

All Implemented Interfaces:: Drawable

public class CCombo
extends Composite
extends Composite

The CCombo class represents a selectable user interface object that combines a text field and a list and issues notification when an item is selected from the list.

CCombo was written to work around certain limitations in the native combo box. Specifically, on win32, the height of a CCombo can be set; attempts to set the height of a Combo are ignored. CCombo can be used anywhere that having the increased flexibility is more important than getting native L&F, but the decision should not be taken lightly. There is no is no strict requirement that CCombo look or behave the same as the native combo box.

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:: BORDER, READ_ONLY, FLAT
Events:: DefaultSelection, Modify, Selection, Verify

See Also:: CCombo snippets, SWT Example: CustomControlExample, Sample code and further information

Field Summary

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

handle

Constructor Summary

CCombo ( 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

void add ( String string)
          Adds the argument to the end of the receiver's list.

void add ( 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 user changes the receiver's selection, 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.

protected void checkSubclass ()
          Checks that this class can be subclassed.

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 copy ()
          Copies the selected text.

void cut ()
          Cuts the selected text.

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.

Control[] getChildren ()
          Returns a (possibly empty) array containing the receiver's children.

boolean getEditable ()
          Gets the editable state.

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.

String[] getItems ()
          Returns an array of Strings which are the items in the receiver's list.

boolean getListVisible ()
          Returns true if the receiver's list is visible, and false otherwise.

Menu getMenu ()
          Returns the receiver's pop up menu if it has one, or null if it does not.

Point getSelection ()
          Returns a Point whose x coordinate is the start of the selection in the receiver's text field, and whose y coordinate is 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.

Shell getShell ()
          Returns the receiver's shell.

int getStyle ()
          Returns the receiver's style information.

String getText ()
          Returns a string containing a copy of the contents of the receiver's text field.

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 ( 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 ( 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.

boolean isFocusControl ()
          Returns true if the receiver has the user-interface focus, and false otherwise.

void paste ()
          Pastes text from clipboard.

void redraw ()
          Causes the entire bounds of the receiver to be marked as needing to be redrawn.

void redraw (int x, int y, int width, int height, boolean all)
          Causes the rectangular area of the receiver specified by the arguments to be marked as needing to be redrawn.

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 ( 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 user changes the receiver's selection.

void removeVerifyListener ( VerifyListener listener)
          Removes the listener from the collection of listeners who will be notified when the control is verified.

void select (int index)
          Selects the item at the given zero-relative index in the receiver's list.

void setBackground ( Color color)
          Sets the receiver's background color to the color specified by the argument, or to the default system color for the control if the argument is null.

void setEditable (boolean editable)
          Sets the editable state.

void setEnabled (boolean enabled)
          Enables the receiver if the argument is true, and disables it otherwise.

boolean setFocus ()
          Causes the receiver to have the keyboard focus, such that all keyboard events will be delivered to it.

void setFont ( Font font)
          Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.

void setForeground ( Color color)
          Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the control if the argument is null.

void setItem (int index, 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 ( String[] items)
          Sets the receiver's list to be the given array of items.

void setLayout ( Layout layout)
          Sets the layout which is associated with the receiver to be the argument which may be null.

void setListVisible (boolean visible)
          Marks the receiver's list as visible if the argument is true, and marks it invisible otherwise.

void setMenu ( Menu menu)
          Sets the receiver's pop up menu to the argument.

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 ( 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 setToolTipText ( String string)
          Sets the receiver's tool tip text to the argument, which may be null indicating that the default tool tip for the control will be shown.

void setVisible (boolean visible)
          Marks the receiver as visible if the argument is true, and marks it invisible otherwise.

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, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, setBackgroundMode, 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, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addMouseWheelListener, addPaintListener, addTraverseListener, computeSize, dragDetect, dragDetect, forceFocus, getAccessible, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getDragDetect, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMonitor, getParent, getRegion, getSize, getToolTipText, getVisible, internal_dispose_GC, internal_new_GC, isEnabled, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, print, removeControlListener, removeDragDetectListener, removeFocusListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removeMouseWheelListener, removePaintListener, removeTraverseListener, setBackgroundImage, setBounds, setBounds, setCapture, setCursor, setDragDetect, setLayoutData, setLocation, setLocation, setParent, setRedraw, setRegion, setSize, setSize, toControl, toControl, toDisplay, toDisplay, traverse, update

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

addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, getListeners, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, setData, setData, toString

Methods inherited from class java.lang. Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CCombo

public CCombo(
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 widget which will be the parent of the new instance (cannot be null)

style - the style of widget to construct

Throws:


IllegalArgumentException

ERROR_NULL_ARGUMENT - if the parent is null


SWTException

ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent

Method Detail

add

public void add(
String string)

Adds the argument to the end of the receiver's list.

Parameters:

string - the new item

Throws:


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(
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:


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)

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:


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

addSelectionListener

public void addSelectionListener(
SelectionListener listener)

Adds the listener to the collection of listeners who will be notified when the user changes the receiver's selection, 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 when the user changes the receiver's selection

Throws:


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

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:


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

Since:

3.3

checkSubclass

protected void checkSubclass()

Description copied from class: Widget

Checks that this class can be subclassed.

The SWT class library is intended to be subclassed only at specific, controlled points (most notably, Composite and Canvas when implementing new widgets). This method enforces this rule unless it is overridden.

IMPORTANT: By providing an implementation of this method that allows a subclass of a class which does not normally allow subclassing to be created, the implementer agrees to be fully responsible for the fact that any such subclass will likely fail between SWT releases and will be strongly platform specific. No support is provided for user-written classes which are implemented in this fashion.

The ability to subclass outside of the allowed SWT classes is intended purely to enable those not on the SWT development team to implement patches in order to get around specific limitations in advance of when those limitations can be addressed by the team. Subclassing should not be attempted without an intimate and detailed understanding of the hierarchy.

Overrides:: checkSubclass in class Composite

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

See Also:

deselectAll()

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"

copy

public void copy()

Copies the selected text.

The current selection is copied to the clipboard.

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:

3.3

cut

public void cut()

Cuts the selected text.

The current selection is first copied to the clipboard and then deleted from the widget.

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:

3.3

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()

getChildren

public 
Control[] getChildren()

Description copied from class: Composite

Returns a (possibly empty) array containing the receiver's children. Children are returned in the order that they are drawn. The topmost control appears at the beginning of the array. Subsequent controls draw beneath this control and appear later in the array.

Note: This is not the actual structure used by the receiver to maintain its list of children, so modifying the array will not affect the receiver.

Overrides:: getChildren in class Composite

Returns:: an array of children
See Also:: Control.moveAbove(org.eclipse.swt.widgets.Control), Control.moveBelow(org.eclipse.swt.widgets.Control)

getEditable

public boolean getEditable()

Gets the editable state.

Returns:

whether or not the receiver is editable

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:

3.0

getItem

public 
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:


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

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

getItems

public 
String[] getItems()

Returns an 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

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:

3.4

getMenu

public 
Menu getMenu()

Description copied from class: Control

Returns the receiver's pop up menu if it has one, or null if it does not. All controls may optionally have a pop up menu that is displayed when the user requests one for the control. The sequence of key strokes, button presses and/or button releases that are used to request a pop up menu is platform specific.

Overrides:: getMenu in class Control

Returns:: the receiver's menu

getSelection

public 
Point getSelection()

Returns a Point whose x coordinate is the start of the selection in the receiver's text field, and whose y coordinate is the end of the selection. The returned values are zero-relative. An "empty" selection as indicated by the the x and y coordinates having the same value.

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

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

getShell

public 
Shell getShell()

Description copied from class: Control

Returns the receiver's shell. For all controls other than shells, this simply returns the control's nearest ancestor shell. Shells return themselves, even if they are children of other shells.

Overrides:: getShell in class Control

Returns:: the receiver's shell
See Also:: Control.getParent()

getStyle

public int getStyle()

Description copied from class: Widget

Returns the receiver's style information.

Note that the value which is returned by this method may not match the value which was provided to the constructor when the receiver was created. This can occur when the underlying operating system does not support a particular combination of requested styles. For example, if the platform widget used to implement a particular SWT widget always has scroll bars, the result of calling this method would always have the SWT.H_SCROLL and SWT.V_SCROLL bits set.

Overrides:: getStyle in class Widget

Returns:: the style bits

getText

public 
String getText()

Returns a string containing a copy of the contents of the receiver's text field.

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

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

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

getVisibleItemCount

public int getVisibleItemCount()

Gets the number of items that are visible in the drop down portion of the receiver's list.

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

Since:

3.0

indexOf

public int indexOf(
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:


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(
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:


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

isFocusControl

public boolean isFocusControl()

Description copied from class: Control

Returns true if the receiver has the user-interface focus, and false otherwise.

Overrides:: isFocusControl in class Control

Returns:: the receiver's focus state

paste

public void paste()

Pastes text from clipboard.

The selected text is deleted from the widget and new text inserted from the clipboard.

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:

3.3

redraw

public void redraw()

Description copied from class: Control

Causes the entire bounds of the receiver to be marked as needing to be redrawn. The next time a paint request is processed, the control will be completely painted, including the background.

Overrides:: redraw in class Control

See Also:: Control.update(), PaintListener, SWT.Paint, SWT.NO_BACKGROUND, SWT.NO_REDRAW_RESIZE, SWT.NO_MERGE_PAINTS, SWT.DOUBLE_BUFFERED

redraw

public void redraw(int x,
                   int y,
                   int width,
                   int height,
                   boolean all)

Description copied from class: Control

Causes the rectangular area of the receiver specified by the arguments to be marked as needing to be redrawn. The next time a paint request is processed, that area of the receiver will be painted, including the background. If the all flag is true, any children of the receiver which intersect with the specified area will also paint their intersecting areas. If the all flag is false, the children will not be painted.

Overrides:: redraw in class Control

Parameters:: x - the x coordinate of the area to draw; y - the y coordinate of the area to draw; width - the width of the area to draw; height - the height of the area to draw; all - true if children should redraw, and false otherwise
See Also:: Control.update(), PaintListener, SWT.Paint, SWT.NO_BACKGROUND, SWT.NO_REDRAW_RESIZE, SWT.NO_MERGE_PAINTS, SWT.DOUBLE_BUFFERED

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:


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:


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(
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:


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

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:


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

removeSelectionListener

public void removeSelectionListener(
SelectionListener listener)

Removes the listener from the collection of listeners who will be notified when the user changes the receiver's selection.

Parameters:

listener - the listener which should no longer be notified

Throws:


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

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:


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

Since:

3.3

select

public void select(int index)

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:

index - 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

setBackground

public void setBackground(
Color color)

Description copied from class: Control

Sets the receiver's background color to the color specified by the argument, or to the default system color for the control if the argument is null.

Note: This operation is a hint and may be overridden by the platform. For example, on Windows the background of a Button cannot be changed.

Overrides:: setBackground in class Control

Parameters:: color - the new color (or null)

setEditable

public void setEditable(boolean editable)

Sets the editable state.

Parameters:

editable - the new editable 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:

3.0

setEnabled

public void setEnabled(boolean enabled)

Description copied from class: Control

Enables the receiver if the argument is true, and disables it otherwise. A disabled control is typically not selectable from the user interface and draws with an inactive or "grayed" look.

Overrides:: setEnabled in class Control

Parameters:: enabled - the new enabled state

setFocus

public boolean setFocus()

Description copied from class: Control

Causes the receiver to have the keyboard focus, such that all keyboard events will be delivered to it. Focus reassignment will respect applicable platform constraints.

Overrides:: setFocus in class Composite

Returns:: true if the control got focus, and false if it was unable to.
See Also:: Control.forceFocus()

setFont

public void setFont(
Font font)

Description copied from class: Control

Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.

Overrides:: setFont in class Control

Parameters:: font - the new font (or null)

setForeground

public void setForeground(
Color color)

Description copied from class: Control

Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the control if the argument is null.

Note: This operation is a hint and may be overridden by the platform.

Overrides:: setForeground in class Control

Parameters:: color - the new color (or null)

setItem

public void setItem(int index,
                    
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 remove'ing the old item at the index, and then add'ing the new item at that index.

Parameters:

index - the index for the item

string - the new text for the item

Throws:


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(
String[] items)

Sets the receiver's list to be the given array of items.

Parameters:

items - the array of items

Throws:


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

setLayout

public void setLayout(
Layout layout)

Sets the layout which is associated with the receiver to be the argument which may be null.

Note: No Layout can be set on this Control because it already manages the size and position of its children.

Overrides:: setLayout in class Composite

Parameters:

layout - the receiver's new layout or null

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:

3.4

setMenu

public void setMenu(
Menu menu)

Description copied from class: Control

Sets the receiver's pop up menu to the argument. All controls may optionally have a pop up menu that is displayed when the user requests one for the control. The sequence of key strokes, button presses and/or button releases that are used to request a pop up menu is platform specific.

Note: Disposing of a control that has a pop up menu will dispose of the menu. To avoid this behavior, set the menu to null before the control is disposed.

Overrides:: setMenu in class Control

Parameters:: menu - the new pop up menu

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:


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

setText

public void setText(
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:


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

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.

Parameters:

limit - new text limit

Throws:


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

setToolTipText

public void setToolTipText(
String string)

Description copied from class: Control

Sets the receiver's tool tip text to the argument, which may be null indicating that the default tool tip for the control will be shown. For a control that has a default tool tip, such as the Tree control on Windows, setting the tool tip text to an empty string replaces the default, causing no tool tip text to be shown.

The mnemonic indicator (character '&') is not displayed in a tool tip. To display a single '&' in the tool tip, the character '&' can be escaped by doubling it in the string.

Overrides:: setToolTipText in class Control

Parameters:: string - the new tool tip text (or null)

setVisible

public void setVisible(boolean visible)

Description copied from class: Control

Marks the receiver 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.

Overrides:: setVisible in class Control

Parameters:: visible - the new visibility state

setVisibleItemCount

public void setVisibleItemCount(int count)

Sets the number of items that are visible in the drop down portion of the receiver's list.

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

Since:

3.0

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Eclipse Platform
Release 3.5

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Guidelines for using Eclipse APIs.

org.eclipse.swt.custom Class CCombo

CCombo

add

add

addModifyListener

addSelectionListener

addVerifyListener

checkSubclass

clearSelection

computeSize

copy

cut

deselect

deselectAll

getChildren

getEditable

getItem

getItemCount

getItemHeight

getItems

getListVisible

getMenu

getSelection

getSelectionIndex

getShell

getStyle

getText

getTextHeight

getTextLimit

getVisibleItemCount

indexOf

indexOf

isFocusControl

paste

redraw

redraw

remove

remove

remove

removeAll

removeModifyListener

removeSelectionListener

removeVerifyListener

select

setBackground

setEditable

setEnabled

setFocus

setFont

setForeground

setItem

setItems

setLayout

setListVisible

setMenu

setSelection

setText

setTextLimit

setToolTipText

setVisible

setVisibleItemCount

org.eclipse.swt.custom
Class CCombo