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Eclipse Platform
Release 3.0

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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 final class CCombo

extends Composite

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

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:

Selection

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 an item.
void	add(String string, int index) Adds an item at an index.
void	addModifyListener(ModifyListener listener) Adds the listener to receive events.
void	addSelectionListener(SelectionListener listener) Adds the listener to receive events.
void	clearSelection() Clears the current selection.
Point	computeSize(int wHint, int hHint, boolean changed) Returns the preferred size of the receiver.
void	deselect(int index) Deselects an item.
void	deselectAll() Deselects all items.
Control[]	getChildren() Returns an array containing the receiver's children.
boolean	getEditable() Gets the editable state.
String	getItem(int index) Gets an item at an index.
int	getItemCount() Gets the number of items.
int	getItemHeight() Gets the height of one item.
String[]	getItems() Gets the items.
Point	getSelection() Gets the selection.
int	getSelectionIndex() Gets the index of the selected item.
int	getStyle() Returns the receiver's style information.
String	getText() Gets the widget text.
int	getTextHeight() Gets the height of the combo's text field.
int	getTextLimit() Gets the text limit.
int	getVisibleItemCount() Gets the number of items that are visible in the drop down portion of the receiver's list.
int	indexOf(String string) Gets the index of an item.
int	indexOf(String string, int start) Gets the index of an item.
boolean	isFocusControl() Returns true if the receiver has the user-interface focus, and false otherwise.
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 an item at an index.
void	remove(int start, int end) Removes a range of items.
void	remove(String string) Removes an item.
void	removeAll() Removes all items.
void	removeModifyListener(ModifyListener listener) Removes the listener.
void	removeSelectionListener(SelectionListener listener) Removes the listener.
void	select(int index) Selects an item.
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 an item; indexing is zero based.
void	setItems(String[] items) Sets all items.
void	setSelection(Point selection) Sets the new selection.
void	setText(String string) Sets the widget text.
void	setTextLimit(int limit) Sets the text limit.
void	setToolTipText(String string) Sets the receiver's tool tip text to the argument, which may be null indicating that no tool tip text should 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

checkSubclass, getLayout, getTabList, layout, layout, setLayout, setTabList

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

computeTrim, getClientArea, getHorizontalBar, getVerticalBar

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

addControlListener, addFocusListener, addHelpListener, addKeyListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addPaintListener, addTraverseListener, computeSize, forceFocus, getAccessible, getBackground, getBorderWidth, getBounds, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getParent, getShell, getSize, getToolTipText, getVisible, internal_dispose_GC, internal_new_GC, isEnabled, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, removeControlListener, removeFocusListener, removeHelpListener, removeKeyListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removePaintListener, removeTraverseListener, setBounds, setBounds, setCapture, setCursor, setLayoutData, setLocation, setLocation, setMenu, setParent, setRedraw, setSize, setSize, toControl, toControl, toDisplay, toDisplay, traverse, update

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

addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, 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

See Also:

SWT.BORDER, SWT.READ_ONLY, SWT.FLAT, Widget.getStyle()

Method Detail

add

public void add(String string)

Adds an item.

The item is placed at the end of the list. Indexing is zero based.

Parameters:

string - the new item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when the string is null

SWTError(ERROR_ITEM_NOT_ADDED) - when the item cannot be added

add

public void add(String string,
                int index)

Adds an item at an index.

The item is placed at an index in the list. Indexing is zero based. This operation will fail when the index is out of range.

Parameters:

string - the new item

index - the index for the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when the string is null

SWTError(ERROR_ITEM_NOT_ADDED) - when the item cannot be added

addModifyListener

public void addModifyListener(ModifyListener listener)

Adds the listener to receive events.

Parameters:

listener - the listener

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when listener is null

addSelectionListener

public void addSelectionListener(SelectionListener listener)

Adds the listener to receive events.

Parameters:

listener - the listener

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when listener is null

clearSelection

public void clearSelection()

Clears the current selection.

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

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

deselect

public void deselect(int index)

Deselects an item.

If the item at an index is selected, it is deselected. If the item at an index is not selected, it remains deselected. Indices that are out of range are ignored. Indexing is zero based.

Parameters:

index - the index of the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

deselectAll

public void deselectAll()

Deselects all items.

If an item is selected, it is deselected. If an item is not selected, it remains unselected.

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

getChildren

public Control[] getChildren()

Description copied from class: Composite

Returns an array containing the receiver's children.

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

getEditable

public boolean getEditable()

Gets the editable state.

Returns:

true if the contents can be edited

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)

Gets an item at an index.

Indexing is zero based. This operation will fail when the index is out of range or an item could not be queried from the OS.

Parameters:

index - the index of the item

Returns:

the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_CANNOT_GET_ITEM) - when the operation fails

getItemCount

public int getItemCount()

Gets the number of items.

This operation will fail if the number of items could not be queried from the OS.

Returns:

the number of items in the widget

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_CANNOT_GET_COUNT) - when the operation fails

getItemHeight

public int getItemHeight()

Gets the height of one item.

This operation will fail if the height of one item could not be queried from the OS.

Returns:

the height of one item in the widget

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_CANNOT_GET_ITEM_HEIGHT) - when the operation fails

getItems

public String[] getItems()

Gets the items.

This operation will fail if the items cannot be queried from the OS.

Returns:

the items in the widget

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_CANNOT_GET_ITEM) - when the operation fails

getSelection

public Point getSelection()

Gets the selection.

Returns:

a point representing the selection start and end

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

getSelectionIndex

public int getSelectionIndex()

Gets the index of the selected item.

Indexing is zero based. If no item is selected -1 is returned.

Returns:

the index of the selected item.

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

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()

Gets the widget text.

If the widget has no text, an empty string is returned.

Returns:

the widget text

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

getTextHeight

public int getTextHeight()

Gets the height of the combo's text field.

The operation will fail if the height cannot be queried from the OS.

Returns:

the height of the combo's text field.

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_ERROR_CANNOT_GET_ITEM_HEIGHT) - when the operation fails

getTextLimit

public int getTextLimit()

Gets the text limit.

Returns:

the text limit

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

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)

Gets the index of an item.

The list is searched starting at 0 until an item is found that is equal to the search item. If no item is found, -1 is returned. Indexing is zero based.

Parameters:

string - the search item

Returns:

the index of the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when string is null

indexOf

public int indexOf(String string,
                   int start)

Gets the index of an item.

The widget is searched starting at start including the end position until an item is found that is equal to the search itenm. If no item is found, -1 is returned. Indexing is zero based.

Parameters:

string - the search item

start - the starting position

Returns:

the index of the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when string is null

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

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

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

remove

public void remove(int index)

Removes an item at an index.

Indexing is zero based. This operation will fail when the index is out of range or an item could not be removed from the OS.

Parameters:

index - the index of the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_ITEM_NOT_REMOVED) - when the operation fails

remove

public void remove(int start,
                   int end)

Removes a range of items.

Indexing is zero based. The range of items is from the start index up to and including the end index. This operation will fail when the index is out of range or an item could not be removed from the OS.

Parameters:

start - the start of the range

end - the end of the range

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_ITEM_NOT_REMOVED) - when the operation fails

remove

public void remove(String string)

Removes an item.

This operation will fail when the item could not be removed from the OS.

Parameters:

string - the search item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when string is null

SWTError(ERROR_ITEM_NOT_REMOVED) - when the operation fails

removeAll

public void removeAll()

Removes all items.

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

removeModifyListener

public void removeModifyListener(ModifyListener listener)

Removes the listener.

Parameters:

listener - the listener

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when listener is null

removeSelectionListener

public void removeSelectionListener(SelectionListener listener)

Removes the listener.

Parameters:

listener - the listener

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when listener is null

select

public void select(int index)

Selects an item.

If the item at an index is not selected, it is selected. Indices that are out of range are ignored. Indexing is zero based.

Parameters:

index - the index of the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

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.

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

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.

Overrides:

setForeground in class Control

Parameters:

color - the new color (or null)

setItem

public void setItem(int index,
                    String string)

Sets the text of an item; indexing is zero based. This operation will fail when the index is out of range or an item could not be changed in the OS.

Parameters:

index - the index for the item

string - the item

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when items is null

SWTError(ERROR_ITEM_NOT_MODIFIED) - when the operation fails

setItems

public void setItems(String[] items)

Sets all items.

Parameters:

items - the array of items

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when items is null

SWTError(ERROR_ITEM_NOT_ADDED) - when the operation fails

setSelection

public void setSelection(Point selection)

Sets the new selection.

Parameters:

selection - point representing the start and the end of the new selection

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when selection is null

setText

public void setText(String string)

Sets the widget text.

Parameters:

string - the widget text

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_NULL_ARGUMENT) - when string is null

setTextLimit

public void setTextLimit(int limit)

Sets the text limit.

Parameters:

limit - new text limit

Throws:

SWTError(ERROR_THREAD_INVALID_ACCESS) - when called from the wrong thread

SWTError(ERROR_WIDGET_DISPOSED) - when the widget has been disposed

SWTError(ERROR_CANNOT_BE_ZERO) - when limit is 0

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 no tool tip text should be shown.

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