Class VScrollTable

java.lang.Object
  com.google.gwt.user.client.ui.UIObject
      com.google.gwt.user.client.ui.Widget
          com.google.gwt.user.client.ui.Panel
              com.google.gwt.user.client.ui.ComplexPanel
                  com.google.gwt.user.client.ui.FlowPanel
                      com.vaadin.terminal.gwt.client.ui.VScrollTable

All Implemented Interfaces:

com.google.gwt.event.dom.client.BlurHandler, com.google.gwt.event.dom.client.FocusHandler, com.google.gwt.event.dom.client.ScrollHandler, com.google.gwt.event.logical.shared.HasAttachHandlers, com.google.gwt.event.shared.EventHandler, com.google.gwt.event.shared.HasHandlers, com.google.gwt.user.client.EventListener, com.google.gwt.user.client.ui.HasWidgets, com.google.gwt.user.client.ui.HasWidgets.ForIsWidget, com.google.gwt.user.client.ui.IndexedPanel, com.google.gwt.user.client.ui.IndexedPanel.ForIsWidget, com.google.gwt.user.client.ui.InsertPanel, com.google.gwt.user.client.ui.InsertPanel.ForIsWidget, com.google.gwt.user.client.ui.IsWidget, Focusable, Paintable, ActionOwner, VHasDropHandler, Table, Iterable<com.google.gwt.user.client.ui.Widget>

Direct Known Subclasses:

VTreeTable

public class VScrollTable
extends com.google.gwt.user.client.ui.FlowPanel
implements Table, com.google.gwt.event.dom.client.ScrollHandler, VHasDropHandler, com.google.gwt.event.dom.client.FocusHandler, com.google.gwt.event.dom.client.BlurHandler, Focusable, ActionOwner

VScrollTable VScrollTable is a FlowPanel having two widgets in it: * TableHead component * ScrollPanel TableHead contains table's header and widgets + logic for resizing, reordering and hiding columns. ScrollPanel contains VScrollTableBody object which handles content. To save some bandwidth and to improve clients responsiveness with loads of data, in VScrollTableBody all rows are not necessary rendered. There are "spacers" in VScrollTableBody to use the exact same space as non-rendered rows would use. This way we can use seamlessly traditional scrollbars and scrolling to fetch more rows instead of "paging". In VScrollTable we listen to scroll events. On horizontal scrolling we also update TableHeads scroll position which has its scrollbars hidden. On vertical scroll events we will check if we are reaching the end of area where we have rows rendered and TODO implement unregistering for child components in Cells

Nested Class Summary
class	VScrollTable.FooterCell           A cell in the footer
class	VScrollTable.HeaderCell
class	VScrollTable.RowHeadersFooterCell           HeaderCell that is header cell for row headers.
class	VScrollTable.RowHeadersHeaderCell           HeaderCell that is header cell for row headers.
class	VScrollTable.TableFooter           The footer of the table which can be seen in the bottom of the Table.
class	VScrollTable.TableHead
class	VScrollTable.VScrollTableBody           This Panel can only contain VScrollTableRow type of widgets.
class	VScrollTable.VScrollTableDropHandler

 

Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject
com.google.gwt.user.client.ui.UIObject.DebugIdImpl, com.google.gwt.user.client.ui.UIObject.DebugIdImplEnabled

 

Nested classes/interfaces inherited from interface com.google.gwt.user.client.ui.HasWidgets
com.google.gwt.user.client.ui.HasWidgets.ForIsWidget

 

Nested classes/interfaces inherited from interface com.google.gwt.user.client.ui.InsertPanel
com.google.gwt.user.client.ui.InsertPanel.ForIsWidget

 

Field Summary
static char	ALIGN_CENTER
static char	ALIGN_LEFT
static char	ALIGN_RIGHT
static String	ATTRIBUTE_KEY_MAPPER_RESET           Tell the client that old keys are no longer valid because the server has cleared its key map.
static String	ATTRIBUTE_PAGEBUFFER_FIRST
static String	ATTRIBUTE_PAGEBUFFER_LAST
static String	CLASSNAME
static String	CLASSNAME_SELECTION_FOCUS
protected  ApplicationConnection	client
static String	COLUMN_REORDER_EVENT_ID
static String	COLUMN_RESIZE_EVENT_ID
static String	FOOTER_CLICK_EVENT_ID
static String	HEADER_CLICK_EVENT_ID
static String	ITEM_CLICK_EVENT_ID
protected  String	paintableId
protected  boolean	showRowHeaders
protected  VScrollTable.TableHead	tHead

 

Fields inherited from class com.google.gwt.user.client.ui.UIObject
DEBUG_ID_PREFIX

 

Fields inherited from interface com.vaadin.terminal.gwt.client.ui.Table
SELECT_MODE_MULTI, SELECT_MODE_NONE, SELECT_MODE_SINGLE

 

Constructor Summary
VScrollTable()

 

Method Summary
protected  void	addAndRemoveRows(UIDL partialRowAdditions)           Inserts rows in the table body or removes them from the table body based on the commands in the UIDL.
protected  String	buildCaptionHtmlSnippet(UIDL uidl)           Helper function to build html snippet for column or row headers
protected  int	calcFirstRowInViewPort()
void	cancelScrollingVelocityTimer()
protected  VScrollTable.VScrollTableBody	createScrollBody()
void	deselectAll()           Deselects all items
protected  void	discardRowsOutsideCacheWindow()           Updates the internal cache by unlinking rows that fall outside of the caching window.
void	focus()           Sets focus to this widget.
String	getActionCaption(String actionKey)
String	getActionIcon(String actionKey)
Action[]	getActions()
ApplicationConnection	getClient()
VScrollTable.VScrollTableDropHandler	getDropHandler()
protected  VScrollTable.VScrollTableBody.VScrollTableRow	getFocusedRow()
protected  int	getHierarchyColumnIndex()           This method exists for the needs of VTreeTable only.
protected  int	getNavigationDownKey()           Get the key that moves the selection head downwards.
protected  int	getNavigationEndKey()           Get the key the moves the selection to the end of the table.
protected  int	getNavigationLeftKey()           Get the key that scrolls to the left in the table.
protected  int	getNavigationPageDownKey()           Get the key the moves the selection one page down in the table.
protected  int	getNavigationPageUpKey()           Get the key the moves the selection one page up in the table.
protected  int	getNavigationRightKey()           Get the key that scroll to the right on the table.
protected  int	getNavigationSelectKey()           Get the key that selects an item in the table.
protected  int	getNavigationStartKey()           Get the key the moves the selection to the beginning of the table.
protected  int	getNavigationUpKey()           Get the key that moves the selection head upwards.
String	getPaintableId()
protected  VScrollTable.VScrollTableBody.VScrollTableRow	getRenderedRowByKey(String key)           Get a rendered row by its key
protected  int	getTotalRows()
protected  boolean	handleNavigation(int keycode, boolean ctrl, boolean shift)           Handles the keyboard events handled by the table
boolean	isFocusable()           Can the Table be focused?
protected  boolean	isSelectable()
void	lazyRevertFocusToRow(VScrollTable.VScrollTableBody.VScrollTableRow currentlyFocusedRow)
protected  int	measureRowHeightOffset(int rowIx)
protected  void	onAttach()
void	onBlur(com.google.gwt.event.dom.client.BlurEvent event)
protected  void	onDetach()
void	onFocus(com.google.gwt.event.dom.client.FocusEvent event)
void	onScroll(com.google.gwt.event.dom.client.ScrollEvent event)           This method has logic which rows needs to be requested from server when user scrolls
protected  void	reOrderColumn(String columnKey, int newIndex)
protected  void	sendSelectedRows()           Sends the selection to the server if changed since the last update/visit.
protected  void	sendSelectedRows(boolean immediately)           Sends the selection to the server if it has been changed since the last update/visit.
protected  void	setColWidth(int colIndex, int w, boolean isDefinedWidth)           Note: not part of the official API, extend at your own risk.
void	setHeight(String height)
protected  boolean	setRowFocus(VScrollTable.VScrollTableBody.VScrollTableRow row)           Moves the selection head to a specific row
protected  void	setTotalRows(int newTotalRows)
void	setVisible(boolean visible)
void	setWidth(String width)
void	startScrollingVelocityTimer()
protected  void	triggerLazyColumnAdjustment(boolean now)
void	updateFromUIDL(UIDL uidl, ApplicationConnection client)
void	updatePageLength()           Determines the pagelength when the table height is fixed.
protected  void	updateTotalRows(UIDL uidl)
protected  boolean	willHaveScrollbars()           Note: this method is not part of official API although declared as protected.

 

Methods inherited from class com.google.gwt.user.client.ui.FlowPanel
add, clear, insert, insert

 

Methods inherited from class com.google.gwt.user.client.ui.ComplexPanel
add, adjustIndex, checkIndexBoundsForAccess, checkIndexBoundsForInsertion, getChildren, getWidget, getWidgetCount, getWidgetIndex, getWidgetIndex, insert, insert, iterator, remove, remove

 

Methods inherited from class com.google.gwt.user.client.ui.Panel
add, adopt, adopt, disown, doAttachChildren, doDetachChildren, orphan, remove

 

Methods inherited from class com.google.gwt.user.client.ui.Widget
addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, fireEvent, getHandlerCount, getLayoutData, getParent, isAttached, isOrWasAttached, onBrowserEvent, onLoad, onUnload, removeFromParent, setLayoutData, sinkEvents

 

Methods inherited from class com.google.gwt.user.client.ui.UIObject

addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, setElement, setElement, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, sinkBitlessEvent, toString, unsinkEvents

 

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

 

Methods inherited from interface com.google.gwt.user.client.ui.HasWidgets
add, clear, iterator, remove

 

Methods inherited from interface com.google.gwt.user.client.ui.InsertPanel.ForIsWidget
add

 

Methods inherited from interface com.google.gwt.user.client.ui.IndexedPanel
getWidget, getWidgetCount, getWidgetIndex, remove

 

Methods inherited from interface com.google.gwt.user.client.ui.IndexedPanel.ForIsWidget
getWidgetIndex

 

Methods inherited from interface com.google.gwt.user.client.ui.IndexedPanel
getWidget, getWidgetCount, getWidgetIndex, remove

 

Field Detail

ATTRIBUTE_PAGEBUFFER_FIRST

public static final String ATTRIBUTE_PAGEBUFFER_FIRST

See Also:

Constant Field Values

ATTRIBUTE_PAGEBUFFER_LAST

public static final String ATTRIBUTE_PAGEBUFFER_LAST

See Also:

Constant Field Values

ATTRIBUTE_KEY_MAPPER_RESET

public static final String ATTRIBUTE_KEY_MAPPER_RESET

Tell the client that old keys are no longer valid because the server has cleared its key map.

See Also:

Constant Field Values

CLASSNAME

public static final String CLASSNAME

See Also:

Constant Field Values

CLASSNAME_SELECTION_FOCUS

public static final String CLASSNAME_SELECTION_FOCUS

See Also:

Constant Field Values

ITEM_CLICK_EVENT_ID

public static final String ITEM_CLICK_EVENT_ID

See Also:

Constant Field Values

HEADER_CLICK_EVENT_ID

public static final String HEADER_CLICK_EVENT_ID

See Also:

Constant Field Values

FOOTER_CLICK_EVENT_ID

public static final String FOOTER_CLICK_EVENT_ID

See Also:

Constant Field Values

COLUMN_RESIZE_EVENT_ID

public static final String COLUMN_RESIZE_EVENT_ID

See Also:

Constant Field Values

COLUMN_REORDER_EVENT_ID

public static final String COLUMN_REORDER_EVENT_ID

See Also:

Constant Field Values

ALIGN_CENTER

public static final char ALIGN_CENTER

See Also:

Constant Field Values

ALIGN_LEFT

public static final char ALIGN_LEFT

See Also:

Constant Field Values

ALIGN_RIGHT

public static final char ALIGN_RIGHT

See Also:

Constant Field Values

showRowHeaders

protected boolean showRowHeaders

client

protected ApplicationConnection client

paintableId

protected String paintableId

tHead

protected final VScrollTable.TableHead tHead

Constructor Detail

VScrollTable

public VScrollTable()

Method Detail

sendSelectedRows

protected void sendSelectedRows()

Sends the selection to the server if changed since the last update/visit.

sendSelectedRows

protected void sendSelectedRows(boolean immediately)

Sends the selection to the server if it has been changed since the last update/visit.

Parameters:

immediately - set to true to immediately send the rows

getNavigationUpKey

protected int getNavigationUpKey()

Get the key that moves the selection head upwards. By default it is the up arrow key but by overriding this you can change the key to whatever you want.

Returns:

The keycode of the key

getNavigationDownKey

protected int getNavigationDownKey()

Get the key that moves the selection head downwards. By default it is the down arrow key but by overriding this you can change the key to whatever you want.

Returns:

The keycode of the key

getNavigationLeftKey

protected int getNavigationLeftKey()

Get the key that scrolls to the left in the table. By default it is the left arrow key but by overriding this you can change the key to whatever you want.

Returns:

The keycode of the key

getNavigationRightKey

protected int getNavigationRightKey()

Get the key that scroll to the right on the table. By default it is the right arrow key but by overriding this you can change the key to whatever you want.

Returns:

The keycode of the key

getNavigationSelectKey

protected int getNavigationSelectKey()

Get the key that selects an item in the table. By default it is the space bar key but by overriding this you can change the key to whatever you want.

Returns:

getNavigationPageUpKey

protected int getNavigationPageUpKey()

Get the key the moves the selection one page up in the table. By default this is the Page Up key but by overriding this you can change the key to whatever you want.

Returns:

getNavigationPageDownKey

protected int getNavigationPageDownKey()

Get the key the moves the selection one page down in the table. By default this is the Page Down key but by overriding this you can change the key to whatever you want.

Returns:

getNavigationStartKey

protected int getNavigationStartKey()

Get the key the moves the selection to the beginning of the table. By default this is the Home key but by overriding this you can change the key to whatever you want.

Returns:

getNavigationEndKey

protected int getNavigationEndKey()

Get the key the moves the selection to the end of the table. By default this is the End key but by overriding this you can change the key to whatever you want.

Returns:

updateFromUIDL

public void updateFromUIDL(UIDL uidl,
                           ApplicationConnection client)

Specified by:

updateFromUIDL in interface Paintable

measureRowHeightOffset

protected int measureRowHeightOffset(int rowIx)

updateTotalRows

protected void updateTotalRows(UIDL uidl)

setTotalRows

protected void setTotalRows(int newTotalRows)

getTotalRows

protected int getTotalRows()

getHierarchyColumnIndex

protected int getHierarchyColumnIndex()

This method exists for the needs of VTreeTable only. Not part of the official API, extend at your own risk.

Returns:

index of TreeTable's hierarchy column, or -1 if not applicable

createScrollBody

protected VScrollTable.VScrollTableBody createScrollBody()

getActionCaption

public String getActionCaption(String actionKey)

getActionIcon

public String getActionIcon(String actionKey)

discardRowsOutsideCacheWindow

protected void discardRowsOutsideCacheWindow()

Updates the internal cache by unlinking rows that fall outside of the caching window.

addAndRemoveRows

protected void addAndRemoveRows(UIDL partialRowAdditions)

Inserts rows in the table body or removes them from the table body based on the commands in the UIDL.

Parameters:

partialRowAdditions - the UIDL containing row updates.

isSelectable

protected boolean isSelectable()

setColWidth

protected void setColWidth(int colIndex,
                           int w,
                           boolean isDefinedWidth)

Note: not part of the official API, extend at your own risk. Sets the indicated column's width for headers and scrollBody alike.

Parameters:

colIndex - index of the modified column

w - new width (may be subject to modifications if doesn't meet minimum requirements)

isDefinedWidth - disables expand ratio if set true

getRenderedRowByKey

protected VScrollTable.VScrollTableBody.VScrollTableRow getRenderedRowByKey(String key)

Get a rendered row by its key

Parameters:

key - The key to search with

Returns:

reOrderColumn

protected void reOrderColumn(String columnKey,
                             int newIndex)

onAttach

protected void onAttach()

Overrides:

onAttach in class com.google.gwt.user.client.ui.Widget

onDetach

protected void onDetach()

Overrides:

onDetach in class com.google.gwt.user.client.ui.Widget

willHaveScrollbars

protected boolean willHaveScrollbars()

Note: this method is not part of official API although declared as protected. Extend at your own risk.

Returns:

true if content area will have scrollbars visible.

deselectAll

public void deselectAll()

Deselects all items

updatePageLength

public void updatePageLength()

Determines the pagelength when the table height is fixed.

setWidth

public void setWidth(String width)

Overrides:

setWidth in class com.google.gwt.user.client.ui.UIObject

setHeight

public void setHeight(String height)

Overrides:

setHeight in class com.google.gwt.user.client.ui.UIObject

setVisible

public void setVisible(boolean visible)

Overrides:

setVisible in class com.google.gwt.user.client.ui.UIObject

buildCaptionHtmlSnippet

protected String buildCaptionHtmlSnippet(UIDL uidl)

Helper function to build html snippet for column or row headers

Parameters:

uidl - possibly with values caption and icon

Returns:

html snippet containing possibly an icon + caption text

onScroll

public void onScroll(com.google.gwt.event.dom.client.ScrollEvent event)

This method has logic which rows needs to be requested from server when user scrolls

Specified by:

onScroll in interface com.google.gwt.event.dom.client.ScrollHandler

calcFirstRowInViewPort

protected int calcFirstRowInViewPort()

getDropHandler

public VScrollTable.VScrollTableDropHandler getDropHandler()

Specified by:

getDropHandler in interface VHasDropHandler

getFocusedRow

protected VScrollTable.VScrollTableBody.VScrollTableRow getFocusedRow()

setRowFocus

protected boolean setRowFocus(VScrollTable.VScrollTableBody.VScrollTableRow row)

Moves the selection head to a specific row

Parameters:

row - The row to where the selection head should move

Returns:

Returns true if focus was moved successfully, else false

handleNavigation

protected boolean handleNavigation(int keycode,
                                   boolean ctrl,
                                   boolean shift)

Handles the keyboard events handled by the table

Parameters:

event - The keyboard event received

Returns:

true iff the navigation event was handled

onFocus

public void onFocus(com.google.gwt.event.dom.client.FocusEvent event)

Specified by:

onFocus in interface com.google.gwt.event.dom.client.FocusHandler

onBlur

public void onBlur(com.google.gwt.event.dom.client.BlurEvent event)

Specified by:

onBlur in interface com.google.gwt.event.dom.client.BlurHandler

isFocusable

public boolean isFocusable()

Can the Table be focused?

Returns:

True if the table can be focused, else false

focus

public void focus()

Description copied from interface: Focusable

Sets focus to this widget.

Specified by:

focus in interface Focusable

startScrollingVelocityTimer

public void startScrollingVelocityTimer()

cancelScrollingVelocityTimer

public void cancelScrollingVelocityTimer()

lazyRevertFocusToRow

public void lazyRevertFocusToRow(VScrollTable.VScrollTableBody.VScrollTableRow currentlyFocusedRow)

getActions

public Action[] getActions()

Specified by:

getActions in interface ActionOwner

Returns:

Array of IActions

getClient

public ApplicationConnection getClient()

Specified by:

getClient in interface ActionOwner

getPaintableId

public String getPaintableId()

Specified by:

getPaintableId in interface ActionOwner

triggerLazyColumnAdjustment

protected void triggerLazyColumnAdjustment(boolean now)