Layout.java
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上传日期:2022-06-15
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文件大小:3k
- /*
- * Copyright 2008 Sun Microsystems, Inc. All Rights Reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Sun designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Sun in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- */
- package com.sun.lwuit.layouts;
- import com.sun.lwuit.geom.Dimension;
- import com.sun.lwuit.*;
- /**
- * Abstract class that can be used to arrange components in a container using
- * a predefined algorithm. This class may be implemented externally and is similar
- * in spirit to the AWT/Swing layout managers.
- *
- * @author Chen Fishbein
- */
- public abstract class Layout {
-
- /**
- * Layout the given parent container children
- *
- * @param parent the given parent container
- */
- public abstract void layoutContainer(Container parent);
-
-
- /**
- * Returns the container preferred size
- *
- * @param parent the parent container
- * @return the container preferred size
- */
- public abstract Dimension getPreferredSize(Container parent);
- /**
- * Some layouts can optionally track the addition of elements with meta-data
- * that allows the user to "hint" on object positioning.
- *
- * @param value optional meta data information, like alignment orientation
- * @param comp the added component to the layout
- * @param c the parent container
- */
- public void addLayoutComponent(Object value, Component comp, Container c) {
- if(value != null) {
- throw new IllegalStateException("Layout doesn't support adding with arguments: " + getClass().getName());
- }
- }
- /**
- * Removes the component from the layout this operation is only useful if the
- * layout maintains references to components within it
- *
- * @param comp the removed component from layout
- */
- public void removeLayoutComponent(Component comp) {}
-
- /**
- * Returns the optional component constraint
- *
- * @param comp the component whose constraint should be returned
- * @return the optional component constraint
- */
- public Object getComponentConstraint(Component comp) {
- return null;
- }
-
- /**
- * This method returns true if the Layout allows Components to
- * Overlap.
- *
- * @return true if Components may intersect in this layout
- */
- public boolean isOverlapSupported(){
- return false;
- }
- }