author | lana |
Thu, 26 Dec 2013 12:04:16 -0800 | |
changeset 23010 | 6dadb192ad81 |
parent 21278 | ef8a3a2a72f2 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
23010
6dadb192ad81
8029235: Update copyright year to match last edit in jdk8 jdk repository for 2013
lana
parents:
21278
diff
changeset
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.swing.text; |
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import java.io.PrintStream; |
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import java.util.Vector; |
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import java.awt.*; |
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import javax.swing.event.DocumentEvent; |
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import javax.swing.SizeRequirements; |
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/** |
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* A view that arranges its children into a box shape by tiling |
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* its children along an axis. The box is somewhat like that |
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* found in TeX where there is alignment of the |
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* children, flexibility of the children is considered, etc. |
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* This is a building block that might be useful to represent |
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* things like a collection of lines, paragraphs, |
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* lists, columns, pages, etc. The axis along which the children are tiled is |
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* considered the major axis. The orthogonal axis is the minor axis. |
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* <p> |
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* Layout for each axis is handled separately by the methods |
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* <code>layoutMajorAxis</code> and <code>layoutMinorAxis</code>. |
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* Subclasses can change the layout algorithm by |
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* reimplementing these methods. These methods will be called |
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* as necessary depending upon whether or not there is cached |
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* layout information and the cache is considered |
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* valid. These methods are typically called if the given size |
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* along the axis changes, or if <code>layoutChanged</code> is |
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* called to force an updated layout. The <code>layoutChanged</code> |
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* method invalidates cached layout information, if there is any. |
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* The requirements published to the parent view are calculated by |
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* the methods <code>calculateMajorAxisRequirements</code> |
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* and <code>calculateMinorAxisRequirements</code>. |
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* If the layout algorithm is changed, these methods will |
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* likely need to be reimplemented. |
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* |
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* @author Timothy Prinzing |
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*/ |
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public class BoxView extends CompositeView { |
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/** |
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* Constructs a <code>BoxView</code>. |
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* |
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* @param elem the element this view is responsible for |
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* @param axis either <code>View.X_AXIS</code> or <code>View.Y_AXIS</code> |
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*/ |
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public BoxView(Element elem, int axis) { |
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super(elem); |
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tempRect = new Rectangle(); |
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this.majorAxis = axis; |
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majorOffsets = new int[0]; |
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majorSpans = new int[0]; |
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majorReqValid = false; |
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majorAllocValid = false; |
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minorOffsets = new int[0]; |
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minorSpans = new int[0]; |
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minorReqValid = false; |
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minorAllocValid = false; |
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} |
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/** |
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* Fetches the tile axis property. This is the axis along which |
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* the child views are tiled. |
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* |
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* @return the major axis of the box, either |
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* <code>View.X_AXIS</code> or <code>View.Y_AXIS</code> |
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* |
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* @since 1.3 |
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*/ |
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public int getAxis() { |
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return majorAxis; |
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} |
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/** |
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* Sets the tile axis property. This is the axis along which |
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* the child views are tiled. |
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* |
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* @param axis either <code>View.X_AXIS</code> or <code>View.Y_AXIS</code> |
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* |
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* @since 1.3 |
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*/ |
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public void setAxis(int axis) { |
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boolean axisChanged = (axis != majorAxis); |
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majorAxis = axis; |
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if (axisChanged) { |
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preferenceChanged(null, true, true); |
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} |
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} |
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/** |
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* Invalidates the layout along an axis. This happens |
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* automatically if the preferences have changed for |
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* any of the child views. In some cases the layout |
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* may need to be recalculated when the preferences |
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* have not changed. The layout can be marked as |
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* invalid by calling this method. The layout will |
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* be updated the next time the <code>setSize</code> method |
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* is called on this view (typically in paint). |
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* |
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* @param axis either <code>View.X_AXIS</code> or <code>View.Y_AXIS</code> |
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* |
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* @since 1.3 |
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*/ |
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public void layoutChanged(int axis) { |
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if (axis == majorAxis) { |
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majorAllocValid = false; |
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} else { |
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minorAllocValid = false; |
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} |
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} |
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/** |
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* Determines if the layout is valid along the given axis. |
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* |
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* @param axis either <code>View.X_AXIS</code> or <code>View.Y_AXIS</code> |
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* |
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* @since 1.4 |
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*/ |
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protected boolean isLayoutValid(int axis) { |
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if (axis == majorAxis) { |
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return majorAllocValid; |
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} else { |
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return minorAllocValid; |
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} |
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} |
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/** |
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* Paints a child. By default |
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* that is all it does, but a subclass can use this to paint |
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* things relative to the child. |
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* |
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* @param g the graphics context |
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* @param alloc the allocated region to paint into |
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* @param index the child index, >= 0 && < getViewCount() |
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*/ |
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protected void paintChild(Graphics g, Rectangle alloc, int index) { |
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View child = getView(index); |
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child.paint(g, alloc); |
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} |
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// --- View methods --------------------------------------------- |
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/** |
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* Invalidates the layout and resizes the cache of |
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* requests/allocations. The child allocations can still |
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* be accessed for the old layout, but the new children |
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* will have an offset and span of 0. |
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* |
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* @param index the starting index into the child views to insert |
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* the new views; this should be a value >= 0 and <= getViewCount |
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* @param length the number of existing child views to remove; |
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* This should be a value >= 0 and <= (getViewCount() - offset) |
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* @param elems the child views to add; this value can be |
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* <code>null</code>to indicate no children are being added |
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* (useful to remove) |
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*/ |
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public void replace(int index, int length, View[] elems) { |
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super.replace(index, length, elems); |
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// invalidate cache |
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int nInserted = (elems != null) ? elems.length : 0; |
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majorOffsets = updateLayoutArray(majorOffsets, index, nInserted); |
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majorSpans = updateLayoutArray(majorSpans, index, nInserted); |
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majorReqValid = false; |
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majorAllocValid = false; |
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minorOffsets = updateLayoutArray(minorOffsets, index, nInserted); |
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minorSpans = updateLayoutArray(minorSpans, index, nInserted); |
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minorReqValid = false; |
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minorAllocValid = false; |
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} |
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/** |
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* Resizes the given layout array to match the new number of |
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* child views. The current number of child views are used to |
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* produce the new array. The contents of the old array are |
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* inserted into the new array at the appropriate places so that |
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* the old layout information is transferred to the new array. |
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* |
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* @param oldArray the original layout array |
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* @param offset location where new views will be inserted |
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* @param nInserted the number of child views being inserted; |
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* therefore the number of blank spaces to leave in the |
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* new array at location <code>offset</code> |
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* @return the new layout array |
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*/ |
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int[] updateLayoutArray(int[] oldArray, int offset, int nInserted) { |
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int n = getViewCount(); |
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int[] newArray = new int[n]; |
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System.arraycopy(oldArray, 0, newArray, 0, offset); |
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System.arraycopy(oldArray, offset, |
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newArray, offset + nInserted, n - nInserted - offset); |
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return newArray; |
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} |
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/** |
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* Forwards the given <code>DocumentEvent</code> to the child views |
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* that need to be notified of the change to the model. |
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* If a child changed its requirements and the allocation |
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* was valid prior to forwarding the portion of the box |
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* from the starting child to the end of the box will |
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* be repainted. |
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* |
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* @param ec changes to the element this view is responsible |
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* for (may be <code>null</code> if there were no changes) |
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* @param e the change information from the associated document |
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* @param a the current allocation of the view |
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* @param f the factory to use to rebuild if the view has children |
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* @see #insertUpdate |
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* @see #removeUpdate |
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* @see #changedUpdate |
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* @since 1.3 |
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*/ |
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protected void forwardUpdate(DocumentEvent.ElementChange ec, |
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DocumentEvent e, Shape a, ViewFactory f) { |
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boolean wasValid = isLayoutValid(majorAxis); |
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super.forwardUpdate(ec, e, a, f); |
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// determine if a repaint is needed |
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if (wasValid && (! isLayoutValid(majorAxis))) { |
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// Repaint is needed because one of the tiled children |
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// have changed their span along the major axis. If there |
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// is a hosting component and an allocated shape we repaint. |
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Component c = getContainer(); |
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if ((a != null) && (c != null)) { |
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int pos = e.getOffset(); |
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int index = getViewIndexAtPosition(pos); |
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Rectangle alloc = getInsideAllocation(a); |
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if (majorAxis == X_AXIS) { |
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alloc.x += majorOffsets[index]; |
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alloc.width -= majorOffsets[index]; |
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} else { |
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alloc.y += minorOffsets[index]; |
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alloc.height -= minorOffsets[index]; |
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} |
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c.repaint(alloc.x, alloc.y, alloc.width, alloc.height); |
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} |
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} |
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} |
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/** |
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* This is called by a child to indicate its |
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* preferred span has changed. This is implemented to |
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* throw away cached layout information so that new |
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* calculations will be done the next time the children |
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* need an allocation. |
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* |
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* @param child the child view |
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* @param width true if the width preference should change |
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* @param height true if the height preference should change |
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*/ |
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public void preferenceChanged(View child, boolean width, boolean height) { |
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boolean majorChanged = (majorAxis == X_AXIS) ? width : height; |
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boolean minorChanged = (majorAxis == X_AXIS) ? height : width; |
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if (majorChanged) { |
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majorReqValid = false; |
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majorAllocValid = false; |
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} |
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if (minorChanged) { |
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minorReqValid = false; |
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minorAllocValid = false; |
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} |
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super.preferenceChanged(child, width, height); |
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} |
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/** |
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* Gets the resize weight. A value of 0 or less is not resizable. |
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* |
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* @param axis may be either <code>View.X_AXIS</code> or |
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* <code>View.Y_AXIS</code> |
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* @return the weight |
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* @exception IllegalArgumentException for an invalid axis |
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*/ |
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public int getResizeWeight(int axis) { |
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checkRequests(axis); |
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if (axis == majorAxis) { |
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if ((majorRequest.preferred != majorRequest.minimum) || |
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(majorRequest.preferred != majorRequest.maximum)) { |
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return 1; |
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} |
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} else { |
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if ((minorRequest.preferred != minorRequest.minimum) || |
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(minorRequest.preferred != minorRequest.maximum)) { |
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return 1; |
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} |
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} |
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return 0; |
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} |
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/** |
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* Sets the size of the view along an axis. This should cause |
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* layout of the view along the given axis. |
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* |
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* @param axis may be either <code>View.X_AXIS</code> or |
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* <code>View.Y_AXIS</code> |
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* @param span the span to layout to >= 0 |
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*/ |
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void setSpanOnAxis(int axis, float span) { |
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if (axis == majorAxis) { |
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if (majorSpan != (int) span) { |
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majorAllocValid = false; |
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} |
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if (! majorAllocValid) { |
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// layout the major axis |
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majorSpan = (int) span; |
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checkRequests(majorAxis); |
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layoutMajorAxis(majorSpan, axis, majorOffsets, majorSpans); |
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majorAllocValid = true; |
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// flush changes to the children |
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updateChildSizes(); |
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} |
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} else { |
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if (((int) span) != minorSpan) { |
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minorAllocValid = false; |
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} |
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if (! minorAllocValid) { |
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// layout the minor axis |
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minorSpan = (int) span; |
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checkRequests(axis); |
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layoutMinorAxis(minorSpan, axis, minorOffsets, minorSpans); |
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minorAllocValid = true; |
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// flush changes to the children |
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updateChildSizes(); |
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} |
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} |
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} |
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/** |
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* Propagates the current allocations to the child views. |
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*/ |
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void updateChildSizes() { |
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int n = getViewCount(); |
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if (majorAxis == X_AXIS) { |
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for (int i = 0; i < n; i++) { |
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View v = getView(i); |
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v.setSize((float) majorSpans[i], (float) minorSpans[i]); |
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} |
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} else { |
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for (int i = 0; i < n; i++) { |
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View v = getView(i); |
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v.setSize((float) minorSpans[i], (float) majorSpans[i]); |
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} |
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} |
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} |
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/** |
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* Returns the size of the view along an axis. This is implemented |
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* to return zero. |
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* |
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* @param axis may be either <code>View.X_AXIS</code> or |
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* <code>View.Y_AXIS</code> |
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* @return the current span of the view along the given axis, >= 0 |
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*/ |
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float getSpanOnAxis(int axis) { |
|
380 |
if (axis == majorAxis) { |
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return majorSpan; |
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382 |
} else { |
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return minorSpan; |
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} |
|
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} |
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/** |
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* Sets the size of the view. This should cause |
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* layout of the view if the view caches any layout |
|
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* information. This is implemented to call the |
|
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* layout method with the sizes inside of the insets. |
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* |
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20158
1c5d22e5b898
8025117: [cleanup] Eliminate doclint errors in javax/swing/text classes
yan
parents:
5506
diff
changeset
|
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* @param width the width >= 0 |
1c5d22e5b898
8025117: [cleanup] Eliminate doclint errors in javax/swing/text classes
yan
parents:
5506
diff
changeset
|
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* @param height the height >= 0 |
2 | 395 |
*/ |
396 |
public void setSize(float width, float height) { |
|
397 |
layout(Math.max(0, (int)(width - getLeftInset() - getRightInset())), |
|
398 |
Math.max(0, (int)(height - getTopInset() - getBottomInset()))); |
|
399 |
} |
|
400 |
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401 |
/** |
|
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* Renders the <code>BoxView</code> using the given |
|
403 |
* rendering surface and area |
|
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* on that surface. Only the children that intersect |
|
405 |
* the clip bounds of the given <code>Graphics</code> |
|
406 |
* will be rendered. |
|
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* |
|
408 |
* @param g the rendering surface to use |
|
409 |
* @param allocation the allocated region to render into |
|
410 |
* @see View#paint |
|
411 |
*/ |
|
412 |
public void paint(Graphics g, Shape allocation) { |
|
413 |
Rectangle alloc = (allocation instanceof Rectangle) ? |
|
414 |
(Rectangle)allocation : allocation.getBounds(); |
|
415 |
int n = getViewCount(); |
|
416 |
int x = alloc.x + getLeftInset(); |
|
417 |
int y = alloc.y + getTopInset(); |
|
418 |
Rectangle clip = g.getClipBounds(); |
|
419 |
for (int i = 0; i < n; i++) { |
|
420 |
tempRect.x = x + getOffset(X_AXIS, i); |
|
421 |
tempRect.y = y + getOffset(Y_AXIS, i); |
|
422 |
tempRect.width = getSpan(X_AXIS, i); |
|
423 |
tempRect.height = getSpan(Y_AXIS, i); |
|
424 |
int trx0 = tempRect.x, trx1 = trx0 + tempRect.width; |
|
425 |
int try0 = tempRect.y, try1 = try0 + tempRect.height; |
|
426 |
int crx0 = clip.x, crx1 = crx0 + clip.width; |
|
427 |
int cry0 = clip.y, cry1 = cry0 + clip.height; |
|
428 |
// We should paint views that intersect with clipping region |
|
429 |
// even if the intersection has no inside points (is a line). |
|
430 |
// This is needed for supporting views that have zero width, like |
|
431 |
// views that contain only combining marks. |
|
432 |
if ((trx1 >= crx0) && (try1 >= cry0) && (crx1 >= trx0) && (cry1 >= try0)) { |
|
433 |
paintChild(g, tempRect, i); |
|
434 |
} |
|
435 |
} |
|
436 |
} |
|
437 |
||
438 |
/** |
|
439 |
* Fetches the allocation for the given child view. |
|
440 |
* This enables finding out where various views |
|
441 |
* are located. This is implemented to return |
|
442 |
* <code>null</code> if the layout is invalid, |
|
443 |
* otherwise the superclass behavior is executed. |
|
444 |
* |
|
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|
445 |
* @param index the index of the child, >= 0 && > getViewCount() |
2 | 446 |
* @param a the allocation to this view |
447 |
* @return the allocation to the child; or <code>null</code> |
|
448 |
* if <code>a</code> is <code>null</code>; |
|
449 |
* or <code>null</code> if the layout is invalid |
|
450 |
*/ |
|
451 |
public Shape getChildAllocation(int index, Shape a) { |
|
452 |
if (a != null) { |
|
453 |
Shape ca = super.getChildAllocation(index, a); |
|
454 |
if ((ca != null) && (! isAllocationValid())) { |
|
455 |
// The child allocation may not have been set yet. |
|
456 |
Rectangle r = (ca instanceof Rectangle) ? |
|
457 |
(Rectangle) ca : ca.getBounds(); |
|
458 |
if ((r.width == 0) && (r.height == 0)) { |
|
459 |
return null; |
|
460 |
} |
|
461 |
} |
|
462 |
return ca; |
|
463 |
} |
|
464 |
return null; |
|
465 |
} |
|
466 |
||
467 |
/** |
|
468 |
* Provides a mapping from the document model coordinate space |
|
469 |
* to the coordinate space of the view mapped to it. This makes |
|
470 |
* sure the allocation is valid before calling the superclass. |
|
471 |
* |
|
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|
472 |
* @param pos the position to convert >= 0 |
2 | 473 |
* @param a the allocated region to render into |
474 |
* @return the bounding box of the given position |
|
475 |
* @exception BadLocationException if the given position does |
|
476 |
* not represent a valid location in the associated document |
|
477 |
* @see View#modelToView |
|
478 |
*/ |
|
479 |
public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException { |
|
480 |
if (! isAllocationValid()) { |
|
481 |
Rectangle alloc = a.getBounds(); |
|
482 |
setSize(alloc.width, alloc.height); |
|
483 |
} |
|
484 |
return super.modelToView(pos, a, b); |
|
485 |
} |
|
486 |
||
487 |
/** |
|
488 |
* Provides a mapping from the view coordinate space to the logical |
|
489 |
* coordinate space of the model. |
|
490 |
* |
|
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changeset
|
491 |
* @param x x coordinate of the view location to convert >= 0 |
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changeset
|
492 |
* @param y y coordinate of the view location to convert >= 0 |
2 | 493 |
* @param a the allocated region to render into |
494 |
* @return the location within the model that best represents the |
|
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|
495 |
* given point in the view >= 0 |
2 | 496 |
* @see View#viewToModel |
497 |
*/ |
|
498 |
public int viewToModel(float x, float y, Shape a, Position.Bias[] bias) { |
|
499 |
if (! isAllocationValid()) { |
|
500 |
Rectangle alloc = a.getBounds(); |
|
501 |
setSize(alloc.width, alloc.height); |
|
502 |
} |
|
503 |
return super.viewToModel(x, y, a, bias); |
|
504 |
} |
|
505 |
||
506 |
/** |
|
507 |
* Determines the desired alignment for this view along an |
|
508 |
* axis. This is implemented to give the total alignment |
|
509 |
* needed to position the children with the alignment points |
|
21278 | 510 |
* lined up along the axis orthogonal to the axis that is |
2 | 511 |
* being tiled. The axis being tiled will request to be |
512 |
* centered (i.e. 0.5f). |
|
513 |
* |
|
514 |
* @param axis may be either <code>View.X_AXIS</code> |
|
515 |
* or <code>View.Y_AXIS</code> |
|
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changeset
|
516 |
* @return the desired alignment >= 0.0f && <= 1.0f; this should |
2 | 517 |
* be a value between 0.0 and 1.0 where 0 indicates alignment at the |
518 |
* origin and 1.0 indicates alignment to the full span |
|
519 |
* away from the origin; an alignment of 0.5 would be the |
|
520 |
* center of the view |
|
521 |
* @exception IllegalArgumentException for an invalid axis |
|
522 |
*/ |
|
523 |
public float getAlignment(int axis) { |
|
524 |
checkRequests(axis); |
|
525 |
if (axis == majorAxis) { |
|
526 |
return majorRequest.alignment; |
|
527 |
} else { |
|
528 |
return minorRequest.alignment; |
|
529 |
} |
|
530 |
} |
|
531 |
||
532 |
/** |
|
533 |
* Determines the preferred span for this view along an |
|
534 |
* axis. |
|
535 |
* |
|
536 |
* @param axis may be either <code>View.X_AXIS</code> |
|
537 |
* or <code>View.Y_AXIS</code> |
|
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changeset
|
538 |
* @return the span the view would like to be rendered into >= 0; |
2 | 539 |
* typically the view is told to render into the span |
540 |
* that is returned, although there is no guarantee; |
|
541 |
* the parent may choose to resize or break the view |
|
542 |
* @exception IllegalArgumentException for an invalid axis type |
|
543 |
*/ |
|
544 |
public float getPreferredSpan(int axis) { |
|
545 |
checkRequests(axis); |
|
546 |
float marginSpan = (axis == X_AXIS) ? getLeftInset() + getRightInset() : |
|
547 |
getTopInset() + getBottomInset(); |
|
548 |
if (axis == majorAxis) { |
|
549 |
return ((float)majorRequest.preferred) + marginSpan; |
|
550 |
} else { |
|
551 |
return ((float)minorRequest.preferred) + marginSpan; |
|
552 |
} |
|
553 |
} |
|
554 |
||
555 |
/** |
|
556 |
* Determines the minimum span for this view along an |
|
557 |
* axis. |
|
558 |
* |
|
559 |
* @param axis may be either <code>View.X_AXIS</code> |
|
560 |
* or <code>View.Y_AXIS</code> |
|
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parents:
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diff
changeset
|
561 |
* @return the span the view would like to be rendered into >= 0; |
2 | 562 |
* typically the view is told to render into the span |
563 |
* that is returned, although there is no guarantee; |
|
564 |
* the parent may choose to resize or break the view |
|
565 |
* @exception IllegalArgumentException for an invalid axis type |
|
566 |
*/ |
|
567 |
public float getMinimumSpan(int axis) { |
|
568 |
checkRequests(axis); |
|
569 |
float marginSpan = (axis == X_AXIS) ? getLeftInset() + getRightInset() : |
|
570 |
getTopInset() + getBottomInset(); |
|
571 |
if (axis == majorAxis) { |
|
572 |
return ((float)majorRequest.minimum) + marginSpan; |
|
573 |
} else { |
|
574 |
return ((float)minorRequest.minimum) + marginSpan; |
|
575 |
} |
|
576 |
} |
|
577 |
||
578 |
/** |
|
579 |
* Determines the maximum span for this view along an |
|
580 |
* axis. |
|
581 |
* |
|
582 |
* @param axis may be either <code>View.X_AXIS</code> |
|
583 |
* or <code>View.Y_AXIS</code> |
|
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parents:
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diff
changeset
|
584 |
* @return the span the view would like to be rendered into >= 0; |
2 | 585 |
* typically the view is told to render into the span |
586 |
* that is returned, although there is no guarantee; |
|
587 |
* the parent may choose to resize or break the view |
|
588 |
* @exception IllegalArgumentException for an invalid axis type |
|
589 |
*/ |
|
590 |
public float getMaximumSpan(int axis) { |
|
591 |
checkRequests(axis); |
|
592 |
float marginSpan = (axis == X_AXIS) ? getLeftInset() + getRightInset() : |
|
593 |
getTopInset() + getBottomInset(); |
|
594 |
if (axis == majorAxis) { |
|
595 |
return ((float)majorRequest.maximum) + marginSpan; |
|
596 |
} else { |
|
597 |
return ((float)minorRequest.maximum) + marginSpan; |
|
598 |
} |
|
599 |
} |
|
600 |
||
601 |
// --- local methods ---------------------------------------------------- |
|
602 |
||
603 |
/** |
|
604 |
* Are the allocations for the children still |
|
605 |
* valid? |
|
606 |
* |
|
607 |
* @return true if allocations still valid |
|
608 |
*/ |
|
609 |
protected boolean isAllocationValid() { |
|
610 |
return (majorAllocValid && minorAllocValid); |
|
611 |
} |
|
612 |
||
613 |
/** |
|
614 |
* Determines if a point falls before an allocated region. |
|
615 |
* |
|
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diff
changeset
|
616 |
* @param x the X coordinate >= 0 |
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yan
parents:
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diff
changeset
|
617 |
* @param y the Y coordinate >= 0 |
2 | 618 |
* @param innerAlloc the allocated region; this is the area |
619 |
* inside of the insets |
|
620 |
* @return true if the point lies before the region else false |
|
621 |
*/ |
|
622 |
protected boolean isBefore(int x, int y, Rectangle innerAlloc) { |
|
623 |
if (majorAxis == View.X_AXIS) { |
|
624 |
return (x < innerAlloc.x); |
|
625 |
} else { |
|
626 |
return (y < innerAlloc.y); |
|
627 |
} |
|
628 |
} |
|
629 |
||
630 |
/** |
|
631 |
* Determines if a point falls after an allocated region. |
|
632 |
* |
|
20158
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yan
parents:
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diff
changeset
|
633 |
* @param x the X coordinate >= 0 |
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8025117: [cleanup] Eliminate doclint errors in javax/swing/text classes
yan
parents:
5506
diff
changeset
|
634 |
* @param y the Y coordinate >= 0 |
2 | 635 |
* @param innerAlloc the allocated region; this is the area |
636 |
* inside of the insets |
|
637 |
* @return true if the point lies after the region else false |
|
638 |
*/ |
|
639 |
protected boolean isAfter(int x, int y, Rectangle innerAlloc) { |
|
640 |
if (majorAxis == View.X_AXIS) { |
|
641 |
return (x > (innerAlloc.width + innerAlloc.x)); |
|
642 |
} else { |
|
643 |
return (y > (innerAlloc.height + innerAlloc.y)); |
|
644 |
} |
|
645 |
} |
|
646 |
||
647 |
/** |
|
648 |
* Fetches the child view at the given coordinates. |
|
649 |
* |
|
20158
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yan
parents:
5506
diff
changeset
|
650 |
* @param x the X coordinate >= 0 |
1c5d22e5b898
8025117: [cleanup] Eliminate doclint errors in javax/swing/text classes
yan
parents:
5506
diff
changeset
|
651 |
* @param y the Y coordinate >= 0 |
2 | 652 |
* @param alloc the parents inner allocation on entry, which should |
21278 | 653 |
* be changed to the child's allocation on exit |
2 | 654 |
* @return the view |
655 |
*/ |
|
656 |
protected View getViewAtPoint(int x, int y, Rectangle alloc) { |
|
657 |
int n = getViewCount(); |
|
658 |
if (majorAxis == View.X_AXIS) { |
|
659 |
if (x < (alloc.x + majorOffsets[0])) { |
|
660 |
childAllocation(0, alloc); |
|
661 |
return getView(0); |
|
662 |
} |
|
663 |
for (int i = 0; i < n; i++) { |
|
664 |
if (x < (alloc.x + majorOffsets[i])) { |
|
665 |
childAllocation(i - 1, alloc); |
|
666 |
return getView(i - 1); |
|
667 |
} |
|
668 |
} |
|
669 |
childAllocation(n - 1, alloc); |
|
670 |
return getView(n - 1); |
|
671 |
} else { |
|
672 |
if (y < (alloc.y + majorOffsets[0])) { |
|
673 |
childAllocation(0, alloc); |
|
674 |
return getView(0); |
|
675 |
} |
|
676 |
for (int i = 0; i < n; i++) { |
|
677 |
if (y < (alloc.y + majorOffsets[i])) { |
|
678 |
childAllocation(i - 1, alloc); |
|
679 |
return getView(i - 1); |
|
680 |
} |
|
681 |
} |
|
682 |
childAllocation(n - 1, alloc); |
|
683 |
return getView(n - 1); |
|
684 |
} |
|
685 |
} |
|
686 |
||
687 |
/** |
|
688 |
* Allocates a region for a child view. |
|
689 |
* |
|
690 |
* @param index the index of the child view to |
|
20158
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8025117: [cleanup] Eliminate doclint errors in javax/swing/text classes
yan
parents:
5506
diff
changeset
|
691 |
* allocate, >= 0 && < getViewCount() |
2 | 692 |
* @param alloc the allocated region |
693 |
*/ |
|
694 |
protected void childAllocation(int index, Rectangle alloc) { |
|
695 |
alloc.x += getOffset(X_AXIS, index); |
|
696 |
alloc.y += getOffset(Y_AXIS, index); |
|
697 |
alloc.width = getSpan(X_AXIS, index); |
|
698 |
alloc.height = getSpan(Y_AXIS, index); |
|
699 |
} |
|
700 |
||
701 |
/** |
|
702 |
* Perform layout on the box |
|
703 |
* |
|
20158
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yan
parents:
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diff
changeset
|
704 |
* @param width the width (inside of the insets) >= 0 |
1c5d22e5b898
8025117: [cleanup] Eliminate doclint errors in javax/swing/text classes
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parents:
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diff
changeset
|
705 |
* @param height the height (inside of the insets) >= 0 |
2 | 706 |
*/ |
707 |
protected void layout(int width, int height) { |
|
708 |
setSpanOnAxis(X_AXIS, width); |
|
709 |
setSpanOnAxis(Y_AXIS, height); |
|
710 |
} |
|
711 |
||
712 |
/** |
|
713 |
* Returns the current width of the box. This is the width that |
|
714 |
* it was last allocated. |
|
715 |
* @return the current width of the box |
|
716 |
*/ |
|
717 |
public int getWidth() { |
|
718 |
int span; |
|
719 |
if (majorAxis == X_AXIS) { |
|
720 |
span = majorSpan; |
|
721 |
} else { |
|
722 |
span = minorSpan; |
|
723 |
} |
|
724 |
span += getLeftInset() - getRightInset(); |
|
725 |
return span; |
|
726 |
} |
|
727 |
||
728 |
/** |
|
729 |
* Returns the current height of the box. This is the height that |
|
730 |
* it was last allocated. |
|
731 |
* @return the current height of the box |
|
732 |
*/ |
|
733 |
public int getHeight() { |
|
734 |
int span; |
|
735 |
if (majorAxis == Y_AXIS) { |
|
736 |
span = majorSpan; |
|
737 |
} else { |
|
738 |
span = minorSpan; |
|
739 |
} |
|
740 |
span += getTopInset() - getBottomInset(); |
|
741 |
return span; |
|
742 |
} |
|
743 |
||
744 |
/** |
|
745 |
* Performs layout for the major axis of the box (i.e. the |
|
746 |
* axis that it represents). The results of the layout (the |
|
747 |
* offset and span for each children) are placed in the given |
|
748 |
* arrays which represent the allocations to the children |
|
749 |
* along the major axis. |
|
750 |
* |
|
751 |
* @param targetSpan the total span given to the view, which |
|
752 |
* would be used to layout the children |
|
753 |
* @param axis the axis being layed out |
|
754 |
* @param offsets the offsets from the origin of the view for |
|
755 |
* each of the child views; this is a return value and is |
|
756 |
* filled in by the implementation of this method |
|
757 |
* @param spans the span of each child view; this is a return |
|
758 |
* value and is filled in by the implementation of this method |
|
759 |
*/ |
|
760 |
protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans) { |
|
761 |
/* |
|
762 |
* first pass, calculate the preferred sizes |
|
763 |
* and the flexibility to adjust the sizes. |
|
764 |
*/ |
|
765 |
long preferred = 0; |
|
766 |
int n = getViewCount(); |
|
767 |
for (int i = 0; i < n; i++) { |
|
768 |
View v = getView(i); |
|
769 |
spans[i] = (int) v.getPreferredSpan(axis); |
|
770 |
preferred += spans[i]; |
|
771 |
} |
|
772 |
||
773 |
/* |
|
774 |
* Second pass, expand or contract by as much as possible to reach |
|
775 |
* the target span. |
|
776 |
*/ |
|
777 |
||
778 |
// determine the adjustment to be made |
|
779 |
long desiredAdjustment = targetSpan - preferred; |
|
780 |
float adjustmentFactor = 0.0f; |
|
781 |
int[] diffs = null; |
|
782 |
||
783 |
if (desiredAdjustment != 0) { |
|
784 |
long totalSpan = 0; |
|
785 |
diffs = new int[n]; |
|
786 |
for (int i = 0; i < n; i++) { |
|
787 |
View v = getView(i); |
|
788 |
int tmp; |
|
789 |
if (desiredAdjustment < 0) { |
|
790 |
tmp = (int)v.getMinimumSpan(axis); |
|
791 |
diffs[i] = spans[i] - tmp; |
|
792 |
} else { |
|
793 |
tmp = (int)v.getMaximumSpan(axis); |
|
794 |
diffs[i] = tmp - spans[i]; |
|
795 |
} |
|
796 |
totalSpan += tmp; |
|
797 |
} |
|
798 |
||
799 |
float maximumAdjustment = Math.abs(totalSpan - preferred); |
|
800 |
adjustmentFactor = desiredAdjustment / maximumAdjustment; |
|
801 |
adjustmentFactor = Math.min(adjustmentFactor, 1.0f); |
|
802 |
adjustmentFactor = Math.max(adjustmentFactor, -1.0f); |
|
803 |
} |
|
804 |
||
805 |
// make the adjustments |
|
806 |
int totalOffset = 0; |
|
807 |
for (int i = 0; i < n; i++) { |
|
808 |
offsets[i] = totalOffset; |
|
809 |
if (desiredAdjustment != 0) { |
|
810 |
float adjF = adjustmentFactor * diffs[i]; |
|
811 |
spans[i] += Math.round(adjF); |
|
812 |
} |
|
813 |
totalOffset = (int) Math.min((long) totalOffset + (long) spans[i], Integer.MAX_VALUE); |
|
814 |
} |
|
815 |
} |
|
816 |
||
817 |
/** |
|
818 |
* Performs layout for the minor axis of the box (i.e. the |
|
21278 | 819 |
* axis orthogonal to the axis that it represents). The results |
2 | 820 |
* of the layout (the offset and span for each children) are |
821 |
* placed in the given arrays which represent the allocations to |
|
822 |
* the children along the minor axis. |
|
823 |
* |
|
824 |
* @param targetSpan the total span given to the view, which |
|
825 |
* would be used to layout the children |
|
826 |
* @param axis the axis being layed out |
|
827 |
* @param offsets the offsets from the origin of the view for |
|
828 |
* each of the child views; this is a return value and is |
|
829 |
* filled in by the implementation of this method |
|
830 |
* @param spans the span of each child view; this is a return |
|
831 |
* value and is filled in by the implementation of this method |
|
832 |
*/ |
|
833 |
protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans) { |
|
834 |
int n = getViewCount(); |
|
835 |
for (int i = 0; i < n; i++) { |
|
836 |
View v = getView(i); |
|
837 |
int max = (int) v.getMaximumSpan(axis); |
|
838 |
if (max < targetSpan) { |
|
839 |
// can't make the child this wide, align it |
|
840 |
float align = v.getAlignment(axis); |
|
841 |
offsets[i] = (int) ((targetSpan - max) * align); |
|
842 |
spans[i] = max; |
|
843 |
} else { |
|
844 |
// make it the target width, or as small as it can get. |
|
845 |
int min = (int)v.getMinimumSpan(axis); |
|
846 |
offsets[i] = 0; |
|
847 |
spans[i] = Math.max(min, targetSpan); |
|
848 |
} |
|
849 |
} |
|
850 |
} |
|
851 |
||
852 |
/** |
|
853 |
* Calculates the size requirements for the major axis |
|
854 |
* <code>axis</code>. |
|
855 |
* |
|
856 |
* @param axis the axis being studied |
|
857 |
* @param r the <code>SizeRequirements</code> object; |
|
858 |
* if <code>null</code> one will be created |
|
859 |
* @return the newly initialized <code>SizeRequirements</code> object |
|
860 |
* @see javax.swing.SizeRequirements |
|
861 |
*/ |
|
862 |
protected SizeRequirements calculateMajorAxisRequirements(int axis, SizeRequirements r) { |
|
863 |
// calculate tiled request |
|
864 |
float min = 0; |
|
865 |
float pref = 0; |
|
866 |
float max = 0; |
|
867 |
||
868 |
int n = getViewCount(); |
|
869 |
for (int i = 0; i < n; i++) { |
|
870 |
View v = getView(i); |
|
871 |
min += v.getMinimumSpan(axis); |
|
872 |
pref += v.getPreferredSpan(axis); |
|
873 |
max += v.getMaximumSpan(axis); |
|
874 |
} |
|
875 |
||
876 |
if (r == null) { |
|
877 |
r = new SizeRequirements(); |
|
878 |
} |
|
879 |
r.alignment = 0.5f; |
|
880 |
r.minimum = (int) min; |
|
881 |
r.preferred = (int) pref; |
|
882 |
r.maximum = (int) max; |
|
883 |
return r; |
|
884 |
} |
|
885 |
||
886 |
/** |
|
887 |
* Calculates the size requirements for the minor axis |
|
888 |
* <code>axis</code>. |
|
889 |
* |
|
890 |
* @param axis the axis being studied |
|
891 |
* @param r the <code>SizeRequirements</code> object; |
|
892 |
* if <code>null</code> one will be created |
|
893 |
* @return the newly initialized <code>SizeRequirements</code> object |
|
894 |
* @see javax.swing.SizeRequirements |
|
895 |
*/ |
|
896 |
protected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r) { |
|
897 |
int min = 0; |
|
898 |
long pref = 0; |
|
899 |
int max = Integer.MAX_VALUE; |
|
900 |
int n = getViewCount(); |
|
901 |
for (int i = 0; i < n; i++) { |
|
902 |
View v = getView(i); |
|
903 |
min = Math.max((int) v.getMinimumSpan(axis), min); |
|
904 |
pref = Math.max((int) v.getPreferredSpan(axis), pref); |
|
905 |
max = Math.max((int) v.getMaximumSpan(axis), max); |
|
906 |
} |
|
907 |
||
908 |
if (r == null) { |
|
909 |
r = new SizeRequirements(); |
|
910 |
r.alignment = 0.5f; |
|
911 |
} |
|
912 |
r.preferred = (int) pref; |
|
913 |
r.minimum = min; |
|
914 |
r.maximum = max; |
|
915 |
return r; |
|
916 |
} |
|
917 |
||
918 |
/** |
|
919 |
* Checks the request cache and update if needed. |
|
920 |
* @param axis the axis being studied |
|
921 |
* @exception IllegalArgumentException if <code>axis</code> is |
|
922 |
* neither <code>View.X_AXIS</code> nor <code>View.Y_AXIS</code> |
|
923 |
*/ |
|
924 |
void checkRequests(int axis) { |
|
925 |
if ((axis != X_AXIS) && (axis != Y_AXIS)) { |
|
926 |
throw new IllegalArgumentException("Invalid axis: " + axis); |
|
927 |
} |
|
928 |
if (axis == majorAxis) { |
|
929 |
if (!majorReqValid) { |
|
930 |
majorRequest = calculateMajorAxisRequirements(axis, |
|
931 |
majorRequest); |
|
932 |
majorReqValid = true; |
|
933 |
} |
|
934 |
} else if (! minorReqValid) { |
|
935 |
minorRequest = calculateMinorAxisRequirements(axis, minorRequest); |
|
936 |
minorReqValid = true; |
|
937 |
} |
|
938 |
} |
|
939 |
||
940 |
/** |
|
941 |
* Computes the location and extent of each child view |
|
942 |
* in this <code>BoxView</code> given the <code>targetSpan</code>, |
|
943 |
* which is the width (or height) of the region we have to |
|
944 |
* work with. |
|
945 |
* |
|
946 |
* @param targetSpan the total span given to the view, which |
|
947 |
* would be used to layout the children |
|
948 |
* @param axis the axis being studied, either |
|
949 |
* <code>View.X_AXIS</code> or <code>View.Y_AXIS</code> |
|
950 |
* @param offsets an empty array filled by this method with |
|
951 |
* values specifying the location of each child view |
|
952 |
* @param spans an empty array filled by this method with |
|
953 |
* values specifying the extent of each child view |
|
954 |
*/ |
|
955 |
protected void baselineLayout(int targetSpan, int axis, int[] offsets, int[] spans) { |
|
956 |
int totalAscent = (int)(targetSpan * getAlignment(axis)); |
|
957 |
int totalDescent = targetSpan - totalAscent; |
|
958 |
||
959 |
int n = getViewCount(); |
|
960 |
||
961 |
for (int i = 0; i < n; i++) { |
|
962 |
View v = getView(i); |
|
963 |
float align = v.getAlignment(axis); |
|
964 |
float viewSpan; |
|
965 |
||
966 |
if (v.getResizeWeight(axis) > 0) { |
|
967 |
// if resizable then resize to the best fit |
|
968 |
||
969 |
// the smallest span possible |
|
970 |
float minSpan = v.getMinimumSpan(axis); |
|
971 |
// the largest span possible |
|
972 |
float maxSpan = v.getMaximumSpan(axis); |
|
973 |
||
974 |
if (align == 0.0f) { |
|
975 |
// if the alignment is 0 then we need to fit into the descent |
|
976 |
viewSpan = Math.max(Math.min(maxSpan, totalDescent), minSpan); |
|
977 |
} else if (align == 1.0f) { |
|
978 |
// if the alignment is 1 then we need to fit into the ascent |
|
979 |
viewSpan = Math.max(Math.min(maxSpan, totalAscent), minSpan); |
|
980 |
} else { |
|
981 |
// figure out the span that we must fit into |
|
982 |
float fitSpan = Math.min(totalAscent / align, |
|
983 |
totalDescent / (1.0f - align)); |
|
984 |
// fit into the calculated span |
|
985 |
viewSpan = Math.max(Math.min(maxSpan, fitSpan), minSpan); |
|
986 |
} |
|
987 |
} else { |
|
988 |
// otherwise use the preferred spans |
|
989 |
viewSpan = v.getPreferredSpan(axis); |
|
990 |
} |
|
991 |
||
992 |
offsets[i] = totalAscent - (int)(viewSpan * align); |
|
993 |
spans[i] = (int)viewSpan; |
|
994 |
} |
|
995 |
} |
|
996 |
||
997 |
/** |
|
998 |
* Calculates the size requirements for this <code>BoxView</code> |
|
999 |
* by examining the size of each child view. |
|
1000 |
* |
|
1001 |
* @param axis the axis being studied |
|
1002 |
* @param r the <code>SizeRequirements</code> object; |
|
1003 |
* if <code>null</code> one will be created |
|
1004 |
* @return the newly initialized <code>SizeRequirements</code> object |
|
1005 |
*/ |
|
1006 |
protected SizeRequirements baselineRequirements(int axis, SizeRequirements r) { |
|
1007 |
SizeRequirements totalAscent = new SizeRequirements(); |
|
1008 |
SizeRequirements totalDescent = new SizeRequirements(); |
|
1009 |
||
1010 |
if (r == null) { |
|
1011 |
r = new SizeRequirements(); |
|
1012 |
} |
|
1013 |
||
1014 |
r.alignment = 0.5f; |
|
1015 |
||
1016 |
int n = getViewCount(); |
|
1017 |
||
1018 |
// loop through all children calculating the max of all their ascents and |
|
1019 |
// descents at minimum, preferred, and maximum sizes |
|
1020 |
for (int i = 0; i < n; i++) { |
|
1021 |
View v = getView(i); |
|
1022 |
float align = v.getAlignment(axis); |
|
1023 |
float span; |
|
1024 |
int ascent; |
|
1025 |
int descent; |
|
1026 |
||
1027 |
// find the maximum of the preferred ascents and descents |
|
1028 |
span = v.getPreferredSpan(axis); |
|
1029 |
ascent = (int)(align * span); |
|
1030 |
descent = (int)(span - ascent); |
|
1031 |
totalAscent.preferred = Math.max(ascent, totalAscent.preferred); |
|
1032 |
totalDescent.preferred = Math.max(descent, totalDescent.preferred); |
|
1033 |
||
1034 |
if (v.getResizeWeight(axis) > 0) { |
|
1035 |
// if the view is resizable then do the same for the minimum and |
|
1036 |
// maximum ascents and descents |
|
1037 |
span = v.getMinimumSpan(axis); |
|
1038 |
ascent = (int)(align * span); |
|
1039 |
descent = (int)(span - ascent); |
|
1040 |
totalAscent.minimum = Math.max(ascent, totalAscent.minimum); |
|
1041 |
totalDescent.minimum = Math.max(descent, totalDescent.minimum); |
|
1042 |
||
1043 |
span = v.getMaximumSpan(axis); |
|
1044 |
ascent = (int)(align * span); |
|
1045 |
descent = (int)(span - ascent); |
|
1046 |
totalAscent.maximum = Math.max(ascent, totalAscent.maximum); |
|
1047 |
totalDescent.maximum = Math.max(descent, totalDescent.maximum); |
|
1048 |
} else { |
|
1049 |
// otherwise use the preferred |
|
1050 |
totalAscent.minimum = Math.max(ascent, totalAscent.minimum); |
|
1051 |
totalDescent.minimum = Math.max(descent, totalDescent.minimum); |
|
1052 |
totalAscent.maximum = Math.max(ascent, totalAscent.maximum); |
|
1053 |
totalDescent.maximum = Math.max(descent, totalDescent.maximum); |
|
1054 |
} |
|
1055 |
} |
|
1056 |
||
1057 |
// we now have an overall preferred, minimum, and maximum ascent and descent |
|
1058 |
||
1059 |
// calculate the preferred span as the sum of the preferred ascent and preferred descent |
|
1060 |
r.preferred = (int)Math.min((long)totalAscent.preferred + (long)totalDescent.preferred, |
|
1061 |
Integer.MAX_VALUE); |
|
1062 |
||
1063 |
// calculate the preferred alignment as the preferred ascent divided by the preferred span |
|
1064 |
if (r.preferred > 0) { |
|
1065 |
r.alignment = (float)totalAscent.preferred / r.preferred; |
|
1066 |
} |
|
1067 |
||
1068 |
||
1069 |
if (r.alignment == 0.0f) { |
|
1070 |
// if the preferred alignment is 0 then the minimum and maximum spans are simply |
|
1071 |
// the minimum and maximum descents since there's nothing above the baseline |
|
1072 |
r.minimum = totalDescent.minimum; |
|
1073 |
r.maximum = totalDescent.maximum; |
|
1074 |
} else if (r.alignment == 1.0f) { |
|
1075 |
// if the preferred alignment is 1 then the minimum and maximum spans are simply |
|
1076 |
// the minimum and maximum ascents since there's nothing below the baseline |
|
1077 |
r.minimum = totalAscent.minimum; |
|
1078 |
r.maximum = totalAscent.maximum; |
|
1079 |
} else { |
|
1080 |
// we want to honor the preferred alignment so we calculate two possible minimum |
|
1081 |
// span values using 1) the minimum ascent and the alignment, and 2) the minimum |
|
1082 |
// descent and the alignment. We'll choose the larger of these two numbers. |
|
1083 |
r.minimum = Math.round(Math.max(totalAscent.minimum / r.alignment, |
|
1084 |
totalDescent.minimum / (1.0f - r.alignment))); |
|
1085 |
// a similar calculation is made for the maximum but we choose the smaller number. |
|
1086 |
r.maximum = Math.round(Math.min(totalAscent.maximum / r.alignment, |
|
1087 |
totalDescent.maximum / (1.0f - r.alignment))); |
|
1088 |
} |
|
1089 |
||
1090 |
return r; |
|
1091 |
} |
|
1092 |
||
1093 |
/** |
|
1094 |
* Fetches the offset of a particular child's current layout. |
|
1095 |
* @param axis the axis being studied |
|
1096 |
* @param childIndex the index of the requested child |
|
1097 |
* @return the offset (location) for the specified child |
|
1098 |
*/ |
|
1099 |
protected int getOffset(int axis, int childIndex) { |
|
1100 |
int[] offsets = (axis == majorAxis) ? majorOffsets : minorOffsets; |
|
1101 |
return offsets[childIndex]; |
|
1102 |
} |
|
1103 |
||
1104 |
/** |
|
21278 | 1105 |
* Fetches the span of a particular child's current layout. |
2 | 1106 |
* @param axis the axis being studied |
1107 |
* @param childIndex the index of the requested child |
|
1108 |
* @return the span (width or height) of the specified child |
|
1109 |
*/ |
|
1110 |
protected int getSpan(int axis, int childIndex) { |
|
1111 |
int[] spans = (axis == majorAxis) ? majorSpans : minorSpans; |
|
1112 |
return spans[childIndex]; |
|
1113 |
} |
|
1114 |
||
1115 |
/** |
|
1116 |
* Determines in which direction the next view lays. |
|
1117 |
* Consider the View at index n. Typically the <code>View</code>s |
|
1118 |
* are layed out from left to right, so that the <code>View</code> |
|
1119 |
* to the EAST will be at index n + 1, and the <code>View</code> |
|
1120 |
* to the WEST will be at index n - 1. In certain situations, |
|
1121 |
* such as with bidirectional text, it is possible |
|
1122 |
* that the <code>View</code> to EAST is not at index n + 1, |
|
1123 |
* but rather at index n - 1, or that the <code>View</code> |
|
1124 |
* to the WEST is not at index n - 1, but index n + 1. |
|
1125 |
* In this case this method would return true, |
|
1126 |
* indicating the <code>View</code>s are layed out in |
|
1127 |
* descending order. Otherwise the method would return false |
|
1128 |
* indicating the <code>View</code>s are layed out in ascending order. |
|
1129 |
* <p> |
|
1130 |
* If the receiver is laying its <code>View</code>s along the |
|
1131 |
* <code>Y_AXIS</code>, this will will return the value from |
|
1132 |
* invoking the same method on the <code>View</code> |
|
1133 |
* responsible for rendering <code>position</code> and |
|
1134 |
* <code>bias</code>. Otherwise this will return false. |
|
1135 |
* |
|
1136 |
* @param position position into the model |
|
1137 |
* @param bias either <code>Position.Bias.Forward</code> or |
|
1138 |
* <code>Position.Bias.Backward</code> |
|
1139 |
* @return true if the <code>View</code>s surrounding the |
|
1140 |
* <code>View</code> responding for rendering |
|
1141 |
* <code>position</code> and <code>bias</code> |
|
1142 |
* are layed out in descending order; otherwise false |
|
1143 |
*/ |
|
1144 |
protected boolean flipEastAndWestAtEnds(int position, |
|
1145 |
Position.Bias bias) { |
|
1146 |
if(majorAxis == Y_AXIS) { |
|
1147 |
int testPos = (bias == Position.Bias.Backward) ? |
|
1148 |
Math.max(0, position - 1) : position; |
|
1149 |
int index = getViewIndexAtPosition(testPos); |
|
1150 |
if(index != -1) { |
|
1151 |
View v = getView(index); |
|
1152 |
if(v != null && v instanceof CompositeView) { |
|
1153 |
return ((CompositeView)v).flipEastAndWestAtEnds(position, |
|
1154 |
bias); |
|
1155 |
} |
|
1156 |
} |
|
1157 |
} |
|
1158 |
return false; |
|
1159 |
} |
|
1160 |
||
1161 |
// --- variables ------------------------------------------------ |
|
1162 |
||
1163 |
int majorAxis; |
|
1164 |
||
1165 |
int majorSpan; |
|
1166 |
int minorSpan; |
|
1167 |
||
1168 |
/* |
|
1169 |
* Request cache |
|
1170 |
*/ |
|
1171 |
boolean majorReqValid; |
|
1172 |
boolean minorReqValid; |
|
1173 |
SizeRequirements majorRequest; |
|
1174 |
SizeRequirements minorRequest; |
|
1175 |
||
1176 |
/* |
|
1177 |
* Allocation cache |
|
1178 |
*/ |
|
1179 |
boolean majorAllocValid; |
|
1180 |
int[] majorOffsets; |
|
1181 |
int[] majorSpans; |
|
1182 |
boolean minorAllocValid; |
|
1183 |
int[] minorOffsets; |
|
1184 |
int[] minorSpans; |
|
1185 |
||
1186 |
/** used in paint. */ |
|
1187 |
Rectangle tempRect; |
|
1188 |
} |