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Class jclass.bwt.JCList

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----jclass.bwt.JCContainer
                                   |
                                   +----jclass.bwt.JCScrolledWindow
                                           |
                                           +----jclass.bwt.JCList

public class JCList

extends JCScrolledWindow

implements JCListInterface, JCItemSelectable

Behavior

• If an item is clicked (or the space key is hit) with no other key pressed, the item is selected if it was previously unselected, or unselected if it was previously selected. The previously selected items are unselected.
• If an item is clicked (or the space key is hit) with the SHIFT key down, the current selection is extended from the current anchor to the item if AllowMultipleSelections is true. If the anchor item is selected, the selection will be selected; if the anchor item is unselected, the selection will be unselected.
• If an item is clicked (or the space key is hit) with the CONTROL key down, the current selection is toggled if AllowMultipleSelections is true, and the item becomes the new anchor. If the mouse is dragged across items, they are selected if AllowMultipleSelections is true.
• Hitting the up or down arrow keys moves the focus item, which is shown as a 2-pixel rectangle drawn around the item. The list will scroll if necessary to display the focus item.
• Typing a character will cause the first item which starts with the character to be made visible and selected. If no item can be found, no action is take

Properties

Name	Method
AllowMultipleSelections	setAllowMultipleSelections
AutoSelect	setAutoSelect
Background	setBackground
Batched	setBatched
Font	setFont
Foreground	setForeground
Insets	setInsets
Items	setItems
PreferredSize	setPreferredSize
RowHeight	setRowHeight
ScrollbarDisplay	setScrollbarDisplay
ScrollbarOffset	setScrollbarOffset
SelectedBackground	setSelectedBackground
SelectedForeground	setSelectedForeground
Spacing	setSpacing
UserData	setUserData
UserDataList	setUserDataList
VisibleRows	setVisibleRows

Events

Class	Listener	Description
JCActionEvent	addActionListener	Posted when an item is double-clicked, or the ENTER key is hit
JCListEvent	addItemListener	Posted when an item is clicked or the space key is hit

JCList()

Creates an empty 4-row list.

JCList(int, boolean)

Creates an empty list with the specified number of visible rows.

JCList(JCVector)

Creates a 4-row list with the specified items.

JCList(JCVector, Applet, String)

Creates a 4-row list which reads parameters from the applet's HTML file.

JCList(String[], String)

Creates a 4-row list with the specified items and name.

addActionListener(JCActionListener)

Adds the specified action listener to receive action events from this list.

addItem(Object)

Adds the specified item to the end of the list.

addItem(Object, int)

Adds or inserts an item to the list.

addItemListener(JCItemListener)

Adds the specified item listener to receive item events from this list.

allowsMultipleSelections()

Returns true if this list allows multiple selections.

clear()

Clears the list.

countItems()

Returns the number of items in the list.

deleteItem(int)

Deletes an item from the list.

deleteItems(int, int)

Delete multiple items from the list.

deselect(int)

Deselects the item at the specified row.

deselectAll()

Deselects all items.

find(Object)

Finds the first row matching the specified item, or BWTEnum.NOTFOUND.

getAllowMultipleSelections()

Returns true if this list allows multiple selections.

getAutoSelect()

Gets the AutoSelect value.

getBatched()

Gets the Batched value.

getItem(int)

Gets the item associated with the specified index.

getItems()

Gets the list's values.

getItemsStrings()

Gets the list's values as a list of Strings.

getList()

Gets the internal list.

getRowHeight()

Gets the height of each row (pixels).

getRows()

Returns the number of visible lines in this list.

getSelectedBackground()

Gets the list's SelectedBackground value.

getSelectedForeground()

Gets the list's SelectedForeground value.

getSelectedIndex()

Gets the selected item on the list or BWTEnum.NOTFOUND if no item is selected.

getSelectedIndexes()

Returns the selected indexes on the list, or null if no item is selected.

getSelectedItem()

Returns the selected item on the list, or null if no item is selected.

getSelectedObjects()

Returns the selected items on the list as Strings, or null if no item is selected.

getSpacing()

Gets the spacing between items.

getTopRow()

Gets the current top-most visible row.

getUserDataList()

Gets the UserDataList value.

getViewportHeight()

Sets the work area height to be the list's virtual height.

getVisibleIndex()

Gets the row of the item that was last made visible by the method makeVisible.

isSelected(int)

Returns true if the item at the specified row has been selected; false otherwise.

makeVisible(int)

Forces the item at the specified row to be visible.

paintRow(int)

Draws a row.

preferredWidth()

Gets the subclass' preferred width (default: 100).

remove(String)

Removes the first occurrence of an item from the list.

removeActionListener(JCActionListener)

Removes the specified action listener so it no longer receives action events from this list.

removeAll()

Removes all items from the list.

removeItemListener(JCItemListener)

Removes the specified item listener so it no longer receives item events from this list.

replaceItem(Object, int)

Replaces the item at the given row.

scrollVertical(JCScrollableInterface, JCAdjustmentEvent, int)

Scrolls the list vertically.

select(int)

Selects the item at the specified row, and posts a JCListEvent

select(int, boolean)

Selects the item at the specified row.

select(Object)

Selects the specified item.

select(Object, boolean)

Selects the specified item.

setAllowMultipleSelections(boolean)

Sets whether the list allows multiple selections.

setAutoSelect(boolean)

If true, the item which currently has focus is also selected (default: false).

HTML param name/value: "AutoSelect"/boolean

setBatched(boolean)

If false (default), the component is repainted every time an item is changed.

setItems(JCVector)

Sets the list's values as a Vector of objects.

HTML param name/value: "Items"/string list

setItems(String[])

Sets the list's values as a list of Strings.

setItemsStrings(String[])

Sets the list's values as a list of Strings.

setList(JCListComponent)

Replaces the current internal list.

setRowHeight(int)

Sets the height of each row (pixels).

HTML param name/value: "RowHeight"/an int, "VARIABLE", or "FONT_HEIGHT"

setSelectedBackground(Color)

Sets the background color of selected rows (default: foreground color).

HTML param name/value: "SelectedBackground"/color

setSelectedForeground(Color)

Sets the foreground color of selected rows (default: background color).

HTML param name/value: "SelectedForeground"/color

setSpacing(int)

Sets the spacing between items (default: 0).

setTopRow(int)

Sets the top-most visible row.

setUserDataList(Object[])

Sets an application-defined list of objects that are maintained for each item.

setVisibleRows(int)

Sets the number of visible rows (default: 4).

 public JCList()

Creates an empty 4-row list. No parameters are read from an HTML file.

 public JCList(JCVector items)

Creates a 4-row list with the specified items. No parameters are read from an HTML file.

See Also:

setItems

 public JCList(String items[],
               String name)

Creates a 4-row list with the specified items and name. No parameters are read from an HTML file.

 public JCList(JCVector items,
               Applet applet,
               String name)

Creates a 4-row list which reads parameters from the applet's HTML file.

Parameters:

items - the initial items; each element may be a String, JCString, or any object (in which case the object's toString() method is called to obtain a string)

applet - the applet whose PARAM tags are to be read

name - if this is not null, only parameters preceded by this name are read

See Also:

setItems, getParameter, JCString

 public JCList(int rows,
               boolean multipleSelections)

Creates an empty list with the specified number of visible rows.

Parameters:

rows - the number of items to show (default: 4). If set to BWTEnum.VARIABLE, the list will attempt to show all its items.

multipleSelections - if true, then multiple selections are allowed

 public JCListComponent getList()

Gets the internal list.

 public void setList(JCListComponent list)

Replaces the current internal list.

 protected int preferredWidth()

Gets the subclass' preferred width (default: 100).

Overrides:

preferredWidth in class JCScrolledWindow

 protected int getViewportHeight()

Sets the work area height to be the list's virtual height.

Overrides:

getViewportHeight in class JCScrolledWindow

 protected void scrollVertical(JCScrollableInterface scrollable,
                               JCAdjustmentEvent ev,
                               int value)

Scrolls the list vertically.

Overrides:

scrollVertical in class JCScrolledWindow

 public void addItemListener(JCItemListener l)

Adds the specified item listener to receive item events from this list. If the listener implements JCListListener (an JCItemListener subclass), it will be passed JCListEvents.

See Also:

JCItemEvent, JCListEvent, JCListListener

 public void removeItemListener(JCItemListener l)

Removes the specified item listener so it no longer receives item events from this list.

 public void addActionListener(JCActionListener l)

Adds the specified action listener to receive action events from this list. Action events occur when a list item is double-clicked.

See Also:

JCActionEvent

 public void removeActionListener(JCActionListener l)

Removes the specified action listener so it no longer receives action events from this list.

See Also:

addActionListener

 public synchronized void remove(String item)

Removes the first occurrence of an item from the list.

Throws: IllegalArgumentException

If the item doesn't exist.

See Also:

deleteItem

 public synchronized JCVector getItems()

Gets the list's values.

See Also:

setItems

 public synchronized void setItems(JCVector items)

Sets the list's values as a Vector of objects.

HTML param name/value: "Items"/string list

Parameters:

items - each object may be a String, JCString, or any object (in which case the object's toString() method is called to obtain a string)

See Also:

JCString, toVector

 public synchronized void setItems(String items[])

Sets the list's values as a list of Strings.

 public synchronized String[] getItemsStrings()

Gets the list's values as a list of Strings.

See Also:

setItems

 public synchronized void setItemsStrings(String items[])

Sets the list's values as a list of Strings.

 public int countItems()

Returns the number of items in the list.

See Also:

getItem

 public Object getItem(int row)

Gets the item associated with the specified index.

Parameters:

row - the position of the item

See Also:

countItems

 public synchronized void addItem(Object item)

Adds the specified item to the end of the list.

Parameters:

item - the item to be added

 public synchronized void addItem(Object item,
                                  int row)

Adds or inserts an item to the list.

Parameters:

item - the item to be added; this may be a String, JCString, or any object (in which case the object's toString() method is called to obtain a string)

row - the position at which to put the item; if row is -1, or greater than the number of items in the list, the item is added to the end

See Also:

JCString

 public synchronized void replaceItem(Object item,
                                      int row)

Replaces the item at the given row.

Parameters:

item - the new value to replace the existing item

row - the position of the item to replace

 public boolean getBatched()

Gets the Batched value.

See Also:

setBatched

 public void setBatched(boolean v)

If false (default), the component is repainted every time an item is changed. If set to true, the component is only repainted (if necessary) when the value is again set to false.

 public synchronized void removeAll()

Removes all items from the list.

Overrides:

removeAll in class Container

See Also:

remove, deleteItems

 public synchronized void clear()

Clears the list.

See Also:

deleteItem, deleteItems

 public synchronized void deleteItem(int row)

Deletes an item from the list.

 public synchronized void deleteItems(int start,
                                      int end)

Delete multiple items from the list.

 public int find(Object item)

Finds the first row matching the specified item, or BWTEnum.NOTFOUND.

 public int getSelectedIndex()

Gets the selected item on the list or BWTEnum.NOTFOUND if no item is selected.

See Also:

select, deselect, isSelected

 public int[] getSelectedIndexes()

Returns the selected indexes on the list, or null if no item is selected.

See Also:

select, deselect, isSelected

 public Object getSelectedItem()

Returns the selected item on the list, or null if no item is selected.

See Also:

select, deselect, isSelected

 public Object[] getSelectedObjects()

Returns the selected items on the list as Strings, or null if no item is selected.

See Also:

select, deselect, isSelected

 public boolean getAutoSelect()

Gets the AutoSelect value.

See Also:

setAutoSelect

 public void setAutoSelect(boolean v)

If true, the item which currently has focus is also selected (default: false).

HTML param name/value: "AutoSelect"/boolean

See Also:

select

 public synchronized void select(int row)

Selects the item at the specified row, and posts a JCListEvent

Parameters:

row - the position of the item to select

See Also:

getSelectedItem, deselect, isSelected, addItemListener

 public synchronized void select(Object item)

Selects the specified item.

See Also:

getSelectedItem, getSelectedIndex

 public synchronized void select(Object item,
                                 boolean notify)

Selects the specified item. If allowsMultipleSelections is false, any previously selected rows are deselected.

Parameters:

notify - if true, a JCListEvent is posted.

See Also:

setAllowMultipleSelections, getSelectedItem, deselect, isSelected, addItemListener

 public synchronized void select(int row,
                                 boolean notify)

Selects the item at the specified row. If allowsMultipleSelections is false, any previously selected rows are deselected.

Parameters:

notify - if true, a JCListEvent is posted.

See Also:

setAllowMultipleSelections, getSelectedItem, deselect, isSelected, addItemListener

 public synchronized void deselect(int row)

Deselects the item at the specified row.

Parameters:

row - the position of the item to deselect

See Also:

select, getSelectedItem, isSelected

 public synchronized void deselectAll()

Deselects all items. No events are posted

 public boolean isSelected(int row)

Returns true if the item at the specified row has been selected; false otherwise.

Parameters:

row - the item to be checked

See Also:

select, deselect, isSelected

 public Color getSelectedBackground()

Gets the list's SelectedBackground value.

See Also:

setSelectedBackground

 public void setSelectedBackground(Color v)

Sets the background color of selected rows (default: foreground color).

HTML param name/value: "SelectedBackground"/color

See Also:

toColor

 public Color getSelectedForeground()

Gets the list's SelectedForeground value.

See Also:

setSelectedForeground

 public void setSelectedForeground(Color v)

Sets the foreground color of selected rows (default: background color).

HTML param name/value: "SelectedForeground"/color

See Also:

toColor

 public int getRows()

Returns the number of visible lines in this list.

 public void setVisibleRows(int v)

Sets the number of visible rows (default: 4). If set to BWTEnum.VARIABLE, the list will attempt to resize itself so that all its items are visible.

HTML param name/value: "VisibleRows"/int

See Also:

setItems

 public int getTopRow()

Gets the current top-most visible row.

See Also:

setTopRow

 public synchronized void setTopRow(int row)

Sets the top-most visible row.

See Also:

makeVisible

 public boolean allowsMultipleSelections()

Returns true if this list allows multiple selections.

See Also:

setAllowMultipleSelections

 public boolean getAllowMultipleSelections()

Returns true if this list allows multiple selections.

See Also:

setAllowMultipleSelections

 public void setAllowMultipleSelections(boolean v)

Sets whether the list allows multiple selections. HTML param name/value: "AllowMultipleSelections"/boolean

See Also:

allowsMultipleSelections

 public int getVisibleIndex()

Gets the row of the item that was last made visible by the method makeVisible.

 public void makeVisible(int row)

Forces the item at the specified row to be visible.

Parameters:

row - the position of the item

See Also:

getVisibleIndex

 public int getRowHeight()

Gets the height of each row (pixels).

See Also:

setRowHeight

 public void setRowHeight(int h)

Sets the height of each row (pixels).

HTML param name/value: "RowHeight"/an int, "VARIABLE", or "FONT_HEIGHT"

Parameters:

h - any int, or one of the following:

If set to BWTEnum.VARIABLE, the height will be calculated individually for each row.

If set to BWTEnum.FONT_HEIGHT (default), the height will be set to the height of the current font.

 public int getSpacing()

Gets the spacing between items.

See Also:

setSpacing

 public void setSpacing(int v)

Sets the spacing between items (default: 0). This value increases the HighlightThickness value.

HTML param name/value: "Spacing"/int

See Also:

setHighlightThickness

 public void paintRow(int row)

Draws a row.

 public Object[] getUserDataList()

Gets the UserDataList value.

See Also:

setUserDataList

 public void setUserDataList(Object v[])

Sets an application-defined list of objects that are maintained for each item.

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