ej.mwt.render

Class RenderPolicy

java.lang.Object

ej.mwt.render.RenderPolicy

Direct Known Subclasses:

DefaultRenderPolicy

public abstract class RenderPolicy
extends Object

A render policy is responsible of rendering the widgets of a desktop on the display.

A render policy is associated to a single desktop.

A render policy provides a method to render the desktop on the display. This method is used by the desktop in order to perform the initial rendering of the complete widget hierarchy.

A render policy also provides a method to handle render requests targeting specific widgets of the desktop. The goal of this method is to render only a part of the widget hierarchy considering that an old representation of the desktop is already visible on the display. The most naive implementation would be to render the whole hierarchy of the desktop.

Constructor Summary

Constructors

Constructor and Description
RenderPolicy(Desktop desktop) Creates a render policy.

Method Summary

Modifier and Type	Method and Description
Desktop	getDesktop() Returns the desktop managed by this render policy.
abstract void	renderDesktop() Renders the desktop on the display.
abstract void	requestRender(Widget widget, int x, int y, int width, int height) Requests a rendering of the given widget on the display.

Methods inherited from class java.lang.Object

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

Constructor Detail

RenderPolicy

public RenderPolicy(Desktop desktop)

Creates a render policy.

Parameters:

desktop - the desktop to render.

Method Detail

getDesktop

public Desktop getDesktop()

Returns the desktop managed by this render policy.

Returns:

the desktop managed by this render policy.

renderDesktop

public abstract void renderDesktop()

Renders the desktop on the display. This method is used by the desktop in order to perform the initial rendering of the complete widget hierarchy.

This method should be called in the MicroUI thread as the rendering of the widget is performed synchronously.

requestRender

public abstract void requestRender(Widget widget,
                                   int x,
                                   int y,
                                   int width,
                                   int height)

Requests a rendering of the given widget on the display. The goal of this method is to render only a part of the widget hierarchy considering that an old representation of the desktop is already visible on the display.

This method returns immediately and the rendering of the widget is performed asynchronously in the MicroUI thread.

The given bounds are relative to the widget.

Parameters:

widget - the widget to render.

x - the x coordinate of the area to render.

y - the y coordinate of the area to render.

width - the width of the area to render.

height - the height of the area to render.