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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: Public abstract class defining the
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* interface for MIDP Canvas Graphics Item.
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*
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*/
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package com.nokia.mid.ui;
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import java.util.Enumeration;
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import javax.microedition.lcdui.Canvas;
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import javax.microedition.lcdui.CustomItem;
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import javax.microedition.lcdui.Graphics;
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import com.nokia.mid.ui.CanvasItem;
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import com.nokia.mid.ui.CanvasGraphicsItemPainter;
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import com.nokia.mj.impl.rt.legacy.NativeError;
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import com.nokia.mj.impl.rt.legacy.ToolkitInvoker;
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import com.nokia.mj.impl.rt.support.Finalizer;
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/**
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* <P>
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* A <code>CanvasGraphicsItem</code> is a drawable component that is used with a
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* parent object; with <code>Canvas</code>. The <code>CanvasGraphicsItem</code>
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* may be added to and removed from <code>Canvas</code> through
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* <code>setParent</code> method.
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* </P>
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*
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* <P>
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* Parent for <code>CanvasGraphicsItem</code> must be set, through
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* <code>setParent</code> method, before other methods are called and change the
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* state or parameters of <code>CanvasGraphicsItem</code>.
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* </P>
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*
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* <P>
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* The implementation presents the <code>CanvasGraphicsItem</code> with the same
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* draw capabilities as <code>Canvas</code> has. See <a
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* href="Graphics.html">Graphics</a> for drawing options.
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* </P>
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*
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* <P>
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* <code>CanvasGraphicsItem</code> does not support DSA over its area. Playing
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* video or using camera over <code>CanvasGraphicsItem</code> area can lead to
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* artifacts on screen.
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* </P>
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*
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* <P>
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* <code>CanvasGraphicsItem</code> does not support touch input. Pointer events
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* are delivered to parent object from the area of the visible
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* <code>CanvasGraphicsItem</code>.
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* </P>
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*
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* <P>
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* Visibility of <code>CanvasGraphicsItem</code> is set through
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* <code>setVisible()</code>. The default visbility is set to false. Changing
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* parent does not affect the visibility status.
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* </P>
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*
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* <P>
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* The <code>CanvasGraphicsItem</code> cannot have focus.
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* </P>
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*
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* @since 1.4
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*/
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public abstract class CanvasGraphicsItem
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extends CanvasItem
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{
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// Private data
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// Native handle
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int iHandle;
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// LCDUI Toolkit invoker object.
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ToolkitInvoker iToolkitInvoker;
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// LCDUI Toolkit object.
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Object iToolkit;
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//Object finalizer
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private Finalizer mFinalizer;
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private com.nokia.mid.ui.CanvasGraphicsItemPainter iItemPainter;
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/**
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* Creates a new <code>CanvasGraphicsItem</code> object with the given
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* initial size.
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*
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* @param width
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* width in pixels
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* @param height
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* height in pixels
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*
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* @throws IllegalArgumentException
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* if the width or height is less than one pixel
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*/
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public CanvasGraphicsItem(int width, int height)
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{
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// Validate width and height.
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if (!(width >= 1 && height >= 1))
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{
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throw new IllegalArgumentException(ERROR_GIVEN_ARGUMENTS_NOT_VALID);
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}
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// Toolkit invoker is needed for accessing javax.microedition.lcdui
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// package
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iToolkitInvoker = ToolkitInvoker.getToolkitInvoker();
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iToolkit = iToolkitInvoker.getToolkit();
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// Create painter
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iItemPainter =
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CanvasGraphicsItemPainterInvoker.createCanvasGraphicsItemPainter(
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this, iToolkit, width, height);
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int painterHandle = iItemPainter.getHandle();
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int handle = 0;
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synchronized (iToolkit)
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{
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// Create native peer object for this Java object.
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handle =
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_createNativePeer(getToolkitHandle(), painterHandle, width,
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height);
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}
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// Check if construction failed and throw out of memory error.
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if (handle <= NativeError.KErrNone)
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{
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throw new OutOfMemoryError();
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}
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// Operation was a success, store size.
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iWidth = width;
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iHeight = height;
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// Sets parent to null
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iParent = null;
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// Set visibility
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iVisible = false;
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// Construction was successful. Store handle and register for
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// finalization.
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iHandle = handle;
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mFinalizer = new Finalizer()
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{
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public void finalizeImpl()
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{
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registeredFinalize();
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}
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};
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}
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/**
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* Set the parent object of this <code>CanvasGraphicsItem</code>.
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*
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* Typically the parent object would be Canvas. Setting the parameter to
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* null removes the association to the parent. If
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* <code>setParent(null)</code> is called for a
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* <code>CanvasGraphicsItem</code> yet not having any parent or
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* <code>setParent(parent)</code> is called with the same parent, the call
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* is silently ignored.
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*
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* @param parent
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* the parent object
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*
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* @throws IllegalArgumentException
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* if <code>aParent</code> is not a valid object with which a
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* CanvasGraphicsItem can be associated, or if CanvasItem
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* is already set to another another parent
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*/
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public void setParent(java.lang.Object parent)
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{
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// Ignore argument check if parent is set to null.
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// Custom item support will be added in future, currently it's
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// unsupported.
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if (((parent != null) && !(parent instanceof Canvas)) ||
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((parent != null) && (iParent != null) && (iParent != parent)))
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{
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throw new IllegalArgumentException(ERROR_NOT_A_VALID_PARENT_OBJECT);
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}
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if (parent != iParent)
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{
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// Lock this object so that parent cannot be adjusted from other
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// threads.
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synchronized (iToolkit)
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{
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int parentHandle = 0;
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// Toolkit invoker can be used to get proper handles.
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if (parent instanceof Canvas)
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{
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// Note that canvas is shown inside a displayable so in this
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// case we use the handle to the displayble object.
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parentHandle = iToolkitInvoker.getDisplayableHandle(parent);
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}
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else if (parent instanceof CustomItem)
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{
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parentHandle = iToolkitInvoker.itemGetHandle(parent);
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}
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// parentHandle = 0 indicates removal of the parent.
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int error =
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_setParent(getToolkitHandle(), iHandle, parentHandle);
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// Check if an error occured when setting the parent object.
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NativeError.check(error);
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// Store new parent
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iParent = parent;
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}
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}
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}
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/**
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* Sets the size of this <code>CanvasGraphicsItem</code> in pixels.
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*
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* @param width
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* width in pixels
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* @param height
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* height in pixels
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*
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* @throws IllegalArgumentException
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* if the width or height is less than one pixel
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*/
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public void setSize(int width, int height)
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{
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// Validate width and row count
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if (width < 1 || height < 1)
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{
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throw new IllegalArgumentException(ERROR_GIVEN_ARGUMENTS_NOT_VALID);
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}
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synchronized (iToolkit)
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{
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NativeError.check(_setSize(getToolkitHandle(), iHandle, width,
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height));
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// Operation was a success, store size.
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iWidth = width;
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iHeight = height;
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}
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}
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/**
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* <P>
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* Sets the rendering position of this <code>CanvasGraphicsItem</code>. The
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* anchor point given is relative to the upper left corner of the target
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* <code>Canvas</code>.
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* </P>
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*
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* <P>
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* The <code>CanvasGraphicsItem</code> may be placed fully off or partially
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* of the visible area of the target <code>Canvas</code> by the
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* <code>setPosition</code> method; in this case the
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* <code>CanvasGraphicsItem</code> is just parly visible.
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* </P>
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*
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* @param x
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* the x coordinate of the anchor point, in pixels.
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* @param y
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* the y coordinate of the anchor point, in pixels.
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*
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* @throws IllegalStateException
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* if a valid parent object hasn't been set.
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*
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* @see #setParent(java.lang.Object aParent)
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*/
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public void setPosition(int x, int y)
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{
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synchronized (iToolkit)
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{
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checkParent();
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NativeError.check(_setPosition(getToolkitHandle(), iHandle, x, y));
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// Store current position.
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iPositionX = x;
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iPositionY = y;
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}
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}
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/**
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* <P>
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* Sets the visibility value of <code>CanvasGraphicsItem</code>. Initially
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* <code>CanvasGraphicsItem</code> is not visible so it must be explicitly
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* set to visible in order it to appear on UI.
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* </P>
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*
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* <P>
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* Setting visibility to true shows the graphics item with its content. If
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* the graphics item is already visible calling
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* <code>setVisible(true)</code> does nothing.
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* </P>
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*
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* <P>
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* Setting the visibility to false hides the graphics item and its content.
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* If the graphics item is already hidden calling
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* <code>setVisible(false)</code> does nothing.
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* </P>
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*
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* @param visible
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* visibility of the <code>CanvasGraphicsItem</code>
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*
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* @throws IllegalStateException
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* if a valid parent object has not been set.
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*
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* @see #setParent(java.lang.Object aParent)
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*/
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public void setVisible(boolean visible)
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{
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synchronized (iToolkit)
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{
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checkParent();
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NativeError
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.check(_setVisible(getToolkitHandle(), iHandle, visible));
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iVisible = visible;
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}
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}
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/**
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* <P>
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* Sets the Z-position (elevation) of the item.
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* <p>
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* The Z-position decides the stacking order of items on the same parent. An
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* item of higher Z-position will be drawn on top of an item with a lower
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* Z-position.
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* <p>
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* The Z-position is unique for each item, meaning that changing a
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* Z-position of an item may change the Z-position of the items that share
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* the same parent. The Z-position does not affect the item's size in any
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* way.
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* <p>
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* When items are added with {@link CanvasItem#setParent} they will get a
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* Z-position that is increased by 1 from the item that is the top most item
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* at that time.
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* </P>
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*
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* @param z
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* the Z-position of the item.
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*
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* @throws IllegalArgumentException
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* if <code>z</code> < 0
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* @throws IllegalStateException
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* if a valid parent object has not been set.
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*
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* @see #getZPosition()
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* @see #setParent(java.lang.Object aParent)
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*/
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public void setZPosition(int z)
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{
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if (z < 0)
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{
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throw new IllegalArgumentException();
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}
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synchronized (iToolkit)
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{
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checkParent();
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NativeError.check(_setZPosition(getToolkitHandle(), iHandle, z));
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}
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}
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/**
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* <P>
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* Returns the Z-position (elevation) of the item.
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*
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* @see #setZPosition(int) </P>
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*
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* @throws IllegalStateException
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* if a valid parent object has not been set.
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*
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* @see #setParent(java.lang.Object aParent)
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*/
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public int getZPosition()
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{
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int positionZ = -1;
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synchronized (iToolkit)
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{
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checkParent();
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positionZ = _getZPosition(getToolkitHandle(), iHandle);
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}
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NativeError.check(positionZ);
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return positionZ;
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}
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/*
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* Hidden default constructor.
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*/
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CanvasGraphicsItem()
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{
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}
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/**
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* <P>
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* Renders the <code>CanvasGraphicsItem</code>.
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* <P>
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* The application implements this method to paint graphics on
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* <code>CanvasGraphicsItem</code>.
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* <P>
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* <code>CanvasGraphicsItem</code> paint works in the same way as
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* <code>Canvas</code> paint method. The only difference to
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* <code>Canvas</code> paint method is that application does not need to
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* paint all the pixels of the clip region as that the clip region needing
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* updating is cleared and fully transparent before paint is called. Content
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* rendered by application in previous paint method calls is not available
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* in the clip region. Coordinates used in <code>Graphics</code> methods are
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* relative to <code>CanvasGraphicsItem</code> itself. This means (0,0)
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* coordinate is top left pixel of <code>CanvasGraphicsItem</code> as
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* positioned in the containing parent (e.g. <code>Canvas</code>).
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* </P>
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*
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* @param graphics
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* the <code>Graphics</code> object to be used for rendering the
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* <code>Canvas</code>
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*
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*/
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protected abstract void paint(javax.microedition.lcdui.Graphics graphics);
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/**
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* Requests a repaint for the specified region of the
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* <code>CanvasGraphicsItem</code>.
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* <P>
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* Coordinates are relative to the <code>CanvasGraphicsItem</code>
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|
446 |
* coordinates. The method works in similar manner as <code>Canvas</code>
|
|
447 |
* repaint method.
|
|
448 |
*
|
|
449 |
* @param x
|
|
450 |
* the x coordinate of the rectangle to be repainted, in pixels
|
|
451 |
* @param y
|
|
452 |
* the y coordinate of the rectangle to be repainted, in pixels
|
|
453 |
* @param width
|
|
454 |
* the width of the rectangle to be repainted, in pixels
|
|
455 |
* @param height
|
|
456 |
* the height of the rectangle to be repainted, in pixels
|
|
457 |
*
|
|
458 |
*/
|
|
459 |
public final void repaint(int x, int y, int width, int height)
|
|
460 |
{
|
|
461 |
iItemPainter.Repaint(x, y, width, height);
|
|
462 |
}
|
|
463 |
|
|
464 |
/**
|
|
465 |
* Requests a repaint for the entire <code>CanvasGraphicsItem</code>. The
|
|
466 |
* effect is identical to
|
|
467 |
* <code>repaint(0, 0, getWidth(), getHeight());</code>
|
|
468 |
*
|
|
469 |
* @see #repaint(int x, int y, int width, int height)
|
|
470 |
*/
|
|
471 |
public final void repaint()
|
|
472 |
{
|
|
473 |
iItemPainter.Repaint(0, 0, getWidth(), getHeight());
|
|
474 |
}
|
|
475 |
|
|
476 |
/*
|
|
477 |
* Disposes the Landmark native peer object, if the handles are valid.
|
|
478 |
* Invalid (negative) handles indicate that their creation failed in the
|
|
479 |
* first place.
|
|
480 |
*/
|
|
481 |
final void registeredFinalize()
|
|
482 |
{
|
|
483 |
if (mFinalizer != null )
|
|
484 |
{
|
|
485 |
synchronized (iToolkit)
|
|
486 |
{
|
|
487 |
if (iHandle != 0)
|
|
488 |
{
|
|
489 |
iToolkitInvoker.toolkitDisposeObject(iToolkit,iHandle);
|
|
490 |
iHandle = 0;
|
|
491 |
}
|
|
492 |
}
|
|
493 |
mFinalizer = null;
|
|
494 |
}
|
|
495 |
}
|
|
496 |
|
|
497 |
void Repaint(Graphics aGraphics)
|
|
498 |
{
|
|
499 |
paint(aGraphics);
|
|
500 |
}
|
|
501 |
|
|
502 |
/*
|
|
503 |
* Returns the native side handle to the LCDUI Toolkit.
|
|
504 |
*
|
|
505 |
* @return The native side handle to the LCDUI Toolkit.
|
|
506 |
*/
|
|
507 |
synchronized int getToolkitHandle()
|
|
508 |
{
|
|
509 |
return iToolkitInvoker.toolkitGetHandle(iToolkit);
|
|
510 |
}
|
|
511 |
|
|
512 |
// Native methods
|
|
513 |
|
|
514 |
/*
|
|
515 |
* Creates the native side peer object for this CanvasGraphicsItem.
|
|
516 |
*
|
|
517 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
518 |
*
|
|
519 |
* @param aPainterHandle A handle of a CanvasGraphicsItemPainter native side
|
|
520 |
* peer
|
|
521 |
*
|
|
522 |
* @param width The new width of this canvas graphics item.
|
|
523 |
*
|
|
524 |
* @param height The new hight of this canvas graphics item.
|
|
525 |
*
|
|
526 |
* @return A handle to the the native side peer object or a system-wide
|
|
527 |
* error code.
|
|
528 |
*/
|
|
529 |
private native int _createNativePeer(
|
|
530 |
int aToolkitHandle,
|
|
531 |
int aPainterHandle,
|
|
532 |
int width,
|
|
533 |
int height);
|
|
534 |
|
|
535 |
/*
|
|
536 |
* Disposes the native side peer object.
|
|
537 |
*
|
|
538 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
539 |
*
|
|
540 |
* @param aNativePeerHandle A handle to the native side peer object.
|
|
541 |
*/
|
|
542 |
private native void _dispose(int aToolkitHandle, int aNativePeerHandle);
|
|
543 |
|
|
544 |
/*
|
|
545 |
* Sets the size of this graphics item using the given width and height.
|
|
546 |
*
|
|
547 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
548 |
*
|
|
549 |
* @param aNativePeerHandle A handle to the native side peer object.
|
|
550 |
*
|
|
551 |
* @param width The new width of this graphics item.
|
|
552 |
*
|
|
553 |
* @param height The new hight of this graphics item.
|
|
554 |
*
|
|
555 |
* @return NativeError.KErrNone if the operation was successful. Otherwise,
|
|
556 |
* a system-wide error code is returned.
|
|
557 |
*/
|
|
558 |
private native int _setSize(
|
|
559 |
int aToolkitHandle,
|
|
560 |
int aNativePeerHandle,
|
|
561 |
int width,
|
|
562 |
int height);
|
|
563 |
|
|
564 |
/*
|
|
565 |
* Disposes the native side peer object.
|
|
566 |
*
|
|
567 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
568 |
*
|
|
569 |
* @param aNativePeerHandle A handle to the native side peer object.
|
|
570 |
*
|
|
571 |
* @param aParentHandle A handle to the parent object.
|
|
572 |
*
|
|
573 |
* @return NativeError.KErrNone if the operation was successful. Otherwise,
|
|
574 |
* a system-wide error code is returned.
|
|
575 |
*/
|
|
576 |
private native int _setParent(
|
|
577 |
int aToolkitHandle,
|
|
578 |
int aNativePeerHandle,
|
|
579 |
int aParentHandle);
|
|
580 |
|
|
581 |
/*
|
|
582 |
* Sets the graphics item visible.
|
|
583 |
*
|
|
584 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
585 |
*
|
|
586 |
* @param aNativePeerHandle A handle to the native side peer object.
|
|
587 |
*
|
|
588 |
* @param aVisible The visibility status of this graphics item.
|
|
589 |
*
|
|
590 |
* @return NativeError.KErrNone if the operation was successful. Otherwise,
|
|
591 |
* a system-wide error code is returned.
|
|
592 |
*/
|
|
593 |
private native int _setVisible(
|
|
594 |
int aToolkitHandle,
|
|
595 |
int aNativePeerHandle,
|
|
596 |
boolean aVisible);
|
|
597 |
|
|
598 |
/*
|
|
599 |
* Sets the graphics item's position.
|
|
600 |
*
|
|
601 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
602 |
*
|
|
603 |
* @param aNativePeerHandle A handle to the native side peer object.
|
|
604 |
*
|
|
605 |
* @param x The x coordinate of the anchor point.
|
|
606 |
*
|
|
607 |
* @param y The y coordinate of the anchor point.
|
|
608 |
*
|
|
609 |
* @return NativeError.KErrNone if the operation was successful. Otherwise,
|
|
610 |
* a system-wide error code is returned.
|
|
611 |
*/
|
|
612 |
private native int _setPosition(
|
|
613 |
int aToolkitHandle,
|
|
614 |
int aNativePeerHandle,
|
|
615 |
int x,
|
|
616 |
int y);
|
|
617 |
|
|
618 |
/*
|
|
619 |
* Sets the elevation of this graphics item.
|
|
620 |
*
|
|
621 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
622 |
*
|
|
623 |
* @param aNativePeerHandle A handle to the native side peer object.
|
|
624 |
*
|
|
625 |
* @param aZ The new z-position.
|
|
626 |
*
|
|
627 |
* @return NativeError.KErrNone if the operation was successful. Otherwise,
|
|
628 |
* a system-wide error code is returned.
|
|
629 |
*/
|
|
630 |
private native int _setZPosition(
|
|
631 |
int aToolkitHandle,
|
|
632 |
int aNativePeerHandle,
|
|
633 |
int aZ);
|
|
634 |
|
|
635 |
/*
|
|
636 |
* Gets the elevation of this graphics item.
|
|
637 |
*
|
|
638 |
* @param aToolkitHandle A handle to the LCDUI toolkit.
|
|
639 |
*
|
|
640 |
* @param aNativePeerHandle A handle to the native side peer object.
|
|
641 |
*
|
|
642 |
* @return The elevation if the operation was successful. Otherwise, a
|
|
643 |
* system-wide error code is returned.
|
|
644 |
*/
|
|
645 |
private native int _getZPosition(int aToolkitHandle, int aNativePeerHandle);
|
|
646 |
} |