Package com.google.gwt.user.client.ui

Class HorizontalPanel

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.CellPanel

com.google.gwt.user.client.ui.HorizontalPanel

All Implemented Interfaces:

HasAttachHandlers, HasHandlers, EventListener, HasAlignment, HasHorizontalAlignment, HasVerticalAlignment, HasVisibility, HasWidgets, HasWidgets.ForIsWidget, IndexedPanel, IndexedPanel.ForIsWidget, InsertPanel, InsertPanel.ForIsWidget, IsWidget, Iterable<Widget>

public class HorizontalPanel
extends CellPanel
implements HasAlignment, InsertPanel.ForIsWidget

A panel that lays all of its widgets out in a single horizontal column.

Nested Class Summary

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

UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled

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

HasHorizontalAlignment.AutoHorizontalAlignmentConstant, HasHorizontalAlignment.HorizontalAlignmentConstant

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

HasVerticalAlignment.VerticalAlignmentConstant

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

HasWidgets.ForIsWidget

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

IndexedPanel.ForIsWidget

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

InsertPanel.ForIsWidget

Field Summary

Fields inherited from class com.google.gwt.user.client.ui.Widget

eventsToSink

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

DEBUG_ID_PREFIX, MISSING_ELEMENT_ERROR, SETELEMENT_TWICE_ERROR

Fields inherited from interface com.google.gwt.user.client.ui.HasHorizontalAlignment

ALIGN_CENTER, ALIGN_DEFAULT, ALIGN_JUSTIFY, ALIGN_LEFT, ALIGN_LOCALE_END, ALIGN_LOCALE_START, ALIGN_RIGHT

Fields inherited from interface com.google.gwt.user.client.ui.HasVerticalAlignment

ALIGN_BOTTOM, ALIGN_MIDDLE, ALIGN_TOP

Constructor Summary

Constructors

Constructor	Description
HorizontalPanel()	Creates an empty horizontal panel.

Method Summary

Modifier and Type	Method	Description
void	add(Widget w)	Adds a child widget.
HasHorizontalAlignment.HorizontalAlignmentConstant	getHorizontalAlignment()	Gets the horizontal alignment.
HasVerticalAlignment.VerticalAlignmentConstant	getVerticalAlignment()	Gets the vertical alignment.
void	insert(IsWidget w, int beforeIndex)
void	insert(Widget w, int beforeIndex)	Inserts a child widget before the specified index.
protected void	onEnsureDebugId(String baseID)	Affected Elements: -# = the cell at the given index.
boolean	remove(Widget w)	Removes a child widget.
void	setHorizontalAlignment(HasHorizontalAlignment.HorizontalAlignmentConstant align)	Sets the default horizontal alignment to be used for widgets added to this panel.
void	setVerticalAlignment(HasVerticalAlignment.VerticalAlignmentConstant align)	Sets the default vertical alignment to be used for widgets added to this panel.

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

getBody, getSpacing, getTable, getWidgetTd, setBorderWidth, setCellHeight, setCellHeight, setCellHorizontalAlignment, setCellHorizontalAlignment, setCellHorizontalAlignment, setCellHorizontalAlignment, setCellVerticalAlignment, setCellVerticalAlignment, setCellVerticalAlignment, setCellVerticalAlignment, setCellWidth, setCellWidth, setSpacing

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

add, add, adjustIndex, checkIndexBoundsForAccess, checkIndexBoundsForInsertion, doLogicalClear, getChildren, getWidget, getWidgetCount, getWidgetIndex, getWidgetIndex, insert, insert, iterator, remove

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

add, adopt, clear, doAttachChildren, doDetachChildren, orphan, remove

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

addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, ensureHandlers, fireEvent, getHandlerCount, getHandlerManager, getLayoutData, getParent, isAttached, isOrWasAttached, onAttach, onBrowserEvent, onDetach, onLoad, onUnload, removeFromParent, replaceElement, setLayoutData, setParent, sinkEvents, unsinkEvents

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, removeStyleDependentName, removeStyleName, resolvePotentialElement, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toString

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.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.InsertPanel.ForIsWidget

add

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Details

HorizontalPanel

public HorizontalPanel()

Creates an empty horizontal panel.

Method Details

add

public void add(Widget w)

Description copied from class: Panel

Adds a child widget.

How to Override this Method

There are several important things that must take place in the correct order to properly add or insert a Widget to a Panel. Not all of these steps will be relevant to every Panel, but all of the steps must be considered.

1. Validate: Perform any sanity checks to ensure the Panel can accept a new Widget. Examples: checking for a valid index on insertion; checking that the Panel is not full if there is a max capacity.
2. Adjust for Reinsertion: Some Panels need to handle the case where the Widget is already a child of this Panel. Example: when performing a reinsert, the index might need to be adjusted to account for the Widget's removal. See ComplexPanel.adjustIndex(Widget, int).
3. Detach Child: Remove the Widget from its existing parent, if any. Most Panels will simply call Widget.removeFromParent() on the Widget.
4. Logical Attach: Any state variables of the Panel should be updated to reflect the addition of the new Widget. Example: the Widget is added to the Panel's WidgetCollection at the appropriate index.
5. Physical Attach: The Widget's Element must be physically attached to the Panel's Element, either directly or indirectly.
6. Adopt: Call Panel.adopt(Widget) to finalize the add as the very last step.

Specified by:

add in interface HasWidgets

Specified by:

add in interface InsertPanel

Overrides:

add in class Panel

Parameters:

w - the widget to be added

See Also:

• HasWidgets.add(Widget)

getHorizontalAlignment

public HasHorizontalAlignment.HorizontalAlignmentConstant getHorizontalAlignment()

Description copied from interface: HasHorizontalAlignment

Gets the horizontal alignment.

Specified by:

getHorizontalAlignment in interface HasHorizontalAlignment

Returns:

the current horizontal alignment ( HasHorizontalAlignment.ALIGN_LEFT, HasHorizontalAlignment.ALIGN_CENTER, HasHorizontalAlignment.ALIGN_RIGHT, HasHorizontalAlignment.ALIGN_JUSTIFY, or null).

getVerticalAlignment

public HasVerticalAlignment.VerticalAlignmentConstant getVerticalAlignment()

Description copied from interface: HasVerticalAlignment

Gets the vertical alignment.

Specified by:

getVerticalAlignment in interface HasVerticalAlignment

Returns:

the current vertical alignment.

insert

public void insert(IsWidget w,
 int beforeIndex)

Specified by:

insert in interface InsertPanel.ForIsWidget

insert

public void insert(Widget w,
 int beforeIndex)

Description copied from interface: InsertPanel

Inserts a child widget before the specified index. If the widget is already a child of this panel, it will be moved to the specified index.

Specified by:

insert in interface InsertPanel

Parameters:

w - the child widget to be inserted

beforeIndex - the index before which it will be inserted

remove

public boolean remove(Widget w)

Description copied from class: Panel

Removes a child widget.

How to Override this Method

There are several important things that must take place in the correct order to properly remove a Widget from a Panel. Not all of these steps will be relevant to every Panel, but all of the steps must be considered.

1. Validate: Make sure this Panel is actually the parent of the child Widget; return false if it is not.
2. Orphan: Call Panel.orphan(Widget) first while the child Widget is still attached.
3. Physical Detach: Adjust the DOM to account for the removal of the child Widget. The Widget's Element must be physically removed from the DOM.
4. Logical Detach: Update the Panel's state variables to reflect the removal of the child Widget. Example: the Widget is removed from the Panel's WidgetCollection.

Specified by:

remove in interface HasWidgets

Overrides:

remove in class ComplexPanel

Parameters:

w - the widget to be removed

Returns:

true if the child was present

setHorizontalAlignment

public void setHorizontalAlignment(HasHorizontalAlignment.HorizontalAlignmentConstant align)

Sets the default horizontal alignment to be used for widgets added to this panel. It only applies to widgets added after this property is set.

Specified by:

setHorizontalAlignment in interface HasHorizontalAlignment

Parameters:

align - the horizontal alignment ( HasHorizontalAlignment.ALIGN_LEFT, HasHorizontalAlignment.ALIGN_CENTER, HasHorizontalAlignment.ALIGN_RIGHT, HasHorizontalAlignment.ALIGN_JUSTIFY, HasHorizontalAlignment.ALIGN_LOCALE_START, or HasHorizontalAlignment.ALIGN_LOCALE_END).

See Also:

• HasHorizontalAlignment.setHorizontalAlignment(HasHorizontalAlignment.HorizontalAlignmentConstant)

setVerticalAlignment

public void setVerticalAlignment(HasVerticalAlignment.VerticalAlignmentConstant align)

Sets the default vertical alignment to be used for widgets added to this panel. It only applies to widgets added after this property is set.

Specified by:

setVerticalAlignment in interface HasVerticalAlignment

Parameters:

align - the vertical alignment ( HasVerticalAlignment.ALIGN_TOP, HasVerticalAlignment.ALIGN_MIDDLE, or HasVerticalAlignment.ALIGN_BOTTOM).

See Also:

• HasVerticalAlignment.setVerticalAlignment(HasVerticalAlignment.VerticalAlignmentConstant)

onEnsureDebugId

protected void onEnsureDebugId(String baseID)

Affected Elements:

• -# = the cell at the given index.

Overrides:

onEnsureDebugId in class UIObject

Parameters:

baseID - the base ID used by the main element

See Also:

• UIObject.onEnsureDebugId(String)