ej.widget.container

Class Canvas

java.lang.Object

ej.mwt.Widget

ej.mwt.Container

ej.widget.container.Canvas

public class Canvas
extends ej.mwt.Container

Lays out any number of children freely.

Each child is laid out at the position it has been given.

In a canvas, each child will have the size it has been given, or if desired, its optimal size.

Field Summary

Fields inherited from class ej.mwt.Widget

NO_CONSTRAINT

Constructor Summary

Constructors

Constructor and Description
Canvas() Creates a canvas.

Method Summary

Modifier and Type	Method and Description
void	addChild(ej.mwt.Widget child, int x, int y, int width, int height) Adds the specified widget to this canvas.
void	changeChildIndex(ej.mwt.Widget child, int index)
protected void	computeContentOptimalSize(ej.mwt.util.Size size)
protected void	layOutChildren(int contentWidth, int contentHeight)
void	removeAllChildren()
void	removeChild(ej.mwt.Widget child)

Methods inherited from class ej.mwt.Container

addChild, computeChildOptimalSize, getChild, getChildIndex, getChildren, getChildrenCount, getContentBounds, getContentHeight, getContentWidth, getContentX, getContentY, getWidgetAt, insertChild, layOutChild, renderChild, renderContent, replaceChild, setHiddenChild, setHiddenChildren, setShownChild, setShownChildren, updateStyle

Methods inherited from class ej.mwt.Widget

addClassSelector, contains, containsWidget, getAbsoluteX, getAbsoluteY, getDesktop, getHeight, getParent, getStyle, getWidth, getX, getY, handleEvent, hasClassSelector, isAttached, isEnabled, isInState, isShown, isTransparent, onAttached, onDetached, onHidden, onLaidOut, onShown, removeAllClassSelectors, removeClassSelector, render, requestLayOut, requestRender, requestRender, setClassSelectors, setEnabled, setPosition, setStyle

Methods inherited from class java.lang.Object

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

Constructor Detail

Canvas

public Canvas()

Creates a canvas.

Method Detail

addChild

public void addChild(ej.mwt.Widget child,
                     int x,
                     int y,
                     int width,
                     int height)

Adds the specified widget to this canvas. The widget is laid out with the given bounds.

If the given width or height is Widget.NO_CONSTRAINT, the widget is fitted to its optimal width/height.

Parameters:

child - the widget to add.

x - the x coordinate of the widget.

y - the y coordinate of the widget.

width - the width of the widget, or Widget.NO_CONSTRAINT to use the widget optimal width.

height - the height of the widget, or Widget.NO_CONSTRAINT to use the widget optimal height.

Throws:

java.lang.NullPointerException - if the specified widget is null.

java.lang.IllegalArgumentException - if the specified widget is already in a hierarchy (already contained in a container or desktop).

See Also:

Container.addChild(Widget)

removeChild

public void removeChild(ej.mwt.Widget child)

Overrides:

removeChild in class ej.mwt.Container

removeAllChildren

public void removeAllChildren()

Overrides:

removeAllChildren in class ej.mwt.Container

changeChildIndex

public void changeChildIndex(ej.mwt.Widget child,
                             int index)

Overrides:

changeChildIndex in class ej.mwt.Container

computeContentOptimalSize

protected void computeContentOptimalSize(ej.mwt.util.Size size)

Specified by:

computeContentOptimalSize in class ej.mwt.Widget

layOutChildren

protected void layOutChildren(int contentWidth,
                              int contentHeight)

Specified by:

layOutChildren in class ej.mwt.Container