8f523f3a10
* sources.am: Regenerated.
* Makefile.in: Likewise.
* scripts/makemake.tcl: Use glob -nocomplain.
From-SVN: r107049
740 lines
22 KiB
Java
740 lines
22 KiB
Java
/* BoxView.java -- An composite view
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.text;
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import java.awt.Graphics;
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import java.awt.Rectangle;
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import java.awt.Shape;
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import javax.swing.SizeRequirements;
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/**
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* An implementation of {@link CompositeView} that arranges its children in
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* a box along one axis. This is comparable to how the <code>BoxLayout</code>
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* works, but for <code>View</code> children.
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*
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* @author Roman Kennke (roman@kennke.org)
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*/
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public class BoxView
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extends CompositeView
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{
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/**
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* The axis along which this <code>BoxView</code> is laid out.
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*/
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int myAxis;
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/**
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* Indicates wether the layout in X_AXIS is valid.
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*/
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boolean xLayoutValid;
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/**
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* Indicates whether the layout in Y_AXIS is valid.
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*/
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boolean yLayoutValid;
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/**
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* The spans in X direction of the children.
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*/
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int[] spansX;
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/**
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* The spans in Y direction of the children.
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*/
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int[] spansY;
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/**
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* The offsets of the children in X direction relative to this BoxView's
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* inner bounds.
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*/
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int[] offsetsX;
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/**
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* The offsets of the children in Y direction relative to this BoxView's
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* inner bounds.
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*/
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int[] offsetsY;
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/**
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* The current width.
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*/
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int width;
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/**
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* The current height.
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*/
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int height;
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/**
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* Creates a new <code>BoxView</code> for the given
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* <code>Element</code> and axis. Valid values for the axis are
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* {@link View#X_AXIS} and {@link View#Y_AXIS}.
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*
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* @param element the element that is rendered by this BoxView
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* @param axis the axis along which the box is laid out
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*/
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public BoxView(Element element, int axis)
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{
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super(element);
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myAxis = axis;
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xLayoutValid = false;
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yLayoutValid = false;
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// Initialize the cache arrays.
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spansX = new int[0];
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spansY = new int[0];
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offsetsX = new int[0];
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offsetsY = new int[0];
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width = 0;
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height = 0;
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}
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/**
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* Returns the axis along which this <code>BoxView</code> is laid out.
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*
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* @return the axis along which this <code>BoxView</code> is laid out
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*/
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public int getAxis()
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{
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return myAxis;
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}
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/**
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* Sets the axis along which this <code>BoxView</code> is laid out.
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*
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* Valid values for the axis are {@link View#X_AXIS} and
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* {@link View#Y_AXIS}.
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*
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* @param axis the axis along which this <code>BoxView</code> is laid out
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*/
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public void setAxis(int axis)
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{
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myAxis = axis;
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}
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/**
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* Marks the layout along the specified axis as invalid. This is triggered
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* automatically when any of the child view changes its preferences
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* via {@link #preferenceChanged(View, boolean, boolean)}.
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*
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* The layout will be updated the next time when
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* {@link #setSize(float, float)} is called, typically from within the
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* {@link #paint(Graphics, Shape)} method.
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*
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* Valid values for the axis are {@link View#X_AXIS} and
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* {@link View#Y_AXIS}.
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*
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* @param axis an <code>int</code> value
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*/
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public void layoutChanged(int axis)
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{
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switch (axis)
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{
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case X_AXIS:
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xLayoutValid = false;
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break;
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case Y_AXIS:
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yLayoutValid = false;
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break;
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default:
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throw new IllegalArgumentException("Invalid axis parameter.");
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}
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}
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/**
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* Returns <code>true</code> if the layout along the specified
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* <code>axis</code> is valid, <code>false</code> otherwise.
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*
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* Valid values for the axis are {@link View#X_AXIS} and
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* {@link View#Y_AXIS}.
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*
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* @param axis the axis
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*
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* @return <code>true</code> if the layout along the specified
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* <code>axis</code> is valid, <code>false</code> otherwise
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*/
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protected boolean isLayoutValid(int axis)
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{
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boolean valid = false;
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switch (axis)
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{
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case X_AXIS:
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valid = xLayoutValid;
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break;
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case Y_AXIS:
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valid = yLayoutValid;
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break;
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default:
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throw new IllegalArgumentException("Invalid axis parameter.");
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}
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return valid;
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}
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/**
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* Paints the child <code>View</code> at the specified <code>index</code>.
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* This method modifies the actual values in <code>alloc</code> so make
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* sure you have a copy of the original values if you need them.
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*
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* @param g the <code>Graphics</code> context to paint to
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* @param alloc the allocated region for the child to paint into
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* @param index the index of the child to be painted
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*
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* @see #childAllocation(int, Rectangle)
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*/
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protected void paintChild(Graphics g, Rectangle alloc, int index)
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{
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View child = getView(index);
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child.paint(g, alloc);
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}
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/**
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* Replaces child views by some other child views. If there are no views to
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* remove (<code>length == 0</code>), the result is a simple insert, if
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* there are no children to add (<code>view == null</code>) the result
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* is a simple removal.
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*
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* In addition this invalidates the layout and resizes the internal cache
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* for the child allocations. The old children's cached allocations can
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* still be accessed (although they are not guaranteed to be valid), and
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* the new children will have an initial offset and span of 0.
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*
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* @param offset the start offset from where to remove children
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* @param length the number of children to remove
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* @param views the views that replace the removed children
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*/
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public void replace(int offset, int length, View[] views)
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{
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// Resize and copy data for cache arrays.
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// The spansX cache.
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int oldSize = getViewCount();
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int[] newSpansX = new int[oldSize - length + views.length];
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System.arraycopy(spansX, 0, newSpansX, 0, offset);
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System.arraycopy(spansX, offset + length, newSpansX,
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offset + views.length,
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oldSize - (offset + length));
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spansX = newSpansX;
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// The spansY cache.
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int[] newSpansY = new int[oldSize - length + views.length];
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System.arraycopy(spansY, 0, newSpansY, 0, offset);
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System.arraycopy(spansY, offset + length, newSpansY,
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offset + views.length,
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oldSize - (offset + length));
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spansY = newSpansY;
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// The offsetsX cache.
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int[] newOffsetsX = new int[oldSize - length + views.length];
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System.arraycopy(offsetsX, 0, newOffsetsX, 0, offset);
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System.arraycopy(offsetsX, offset + length, newOffsetsX,
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offset + views.length,
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oldSize - (offset + length));
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offsetsX = newOffsetsX;
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// The offsetsY cache.
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int[] newOffsetsY = new int[oldSize - length + views.length];
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System.arraycopy(offsetsY, 0, newOffsetsY, 0, offset);
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System.arraycopy(offsetsY, offset + length, newOffsetsY,
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offset + views.length,
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oldSize - (offset + length));
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offsetsY = newOffsetsY;
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// Actually perform the replace.
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super.replace(offset, length, views);
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// Invalidate layout information.
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layoutChanged(X_AXIS);
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layoutChanged(Y_AXIS);
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}
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/**
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* Renders the <code>Element</code> that is associated with this
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* <code>View</code>.
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*
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* @param g the <code>Graphics</code> context to render to
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* @param a the allocated region for the <code>Element</code>
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*/
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public void paint(Graphics g, Shape a)
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{
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// Adjust size if the size is changed.
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Rectangle bounds = a.getBounds();
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if (bounds.width != getWidth() || bounds.height != getHeight())
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setSize(bounds.width, bounds.height);
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Rectangle inside = getInsideAllocation(a);
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Rectangle copy = new Rectangle(inside);
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int count = getViewCount();
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for (int i = 0; i < count; ++i)
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{
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copy.setBounds(inside);
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childAllocation(i, copy);
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if (!copy.isEmpty()
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&& g.hitClip(copy.x, copy.y, copy.width, copy.height))
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paintChild(g, copy, i);
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}
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}
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/**
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* Returns the preferred span of the content managed by this
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* <code>View</code> along the specified <code>axis</code>.
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*
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* @param axis the axis
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*
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* @return the preferred span of this <code>View</code>.
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*/
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public float getPreferredSpan(int axis)
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{
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SizeRequirements sr = new SizeRequirements();
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int pref = baselineRequirements(axis, sr).preferred;
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return (float) pref;
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}
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public float getMaximumSpan(int axis)
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{
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if (axis == getAxis())
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return getPreferredSpan(axis);
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else
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return Integer.MAX_VALUE;
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}
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/**
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* Calculates the size requirements for this <code>BoxView</code> along
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* the specified axis.
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*
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* @param axis the axis that is examined
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* @param sr the <code>SizeRequirements</code> object to hold the result,
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* if <code>null</code>, a new one is created
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*
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* @return the size requirements for this <code>BoxView</code> along
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* the specified axis
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*/
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protected SizeRequirements baselineRequirements(int axis,
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SizeRequirements sr)
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{
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SizeRequirements result;
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if (axis == myAxis)
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result = calculateMajorAxisRequirements(axis, sr);
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else
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result = calculateMinorAxisRequirements(axis, sr);
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return result;
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}
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/**
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* Calculates the layout of the children of this <code>BoxView</code> along
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* the specified axis.
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*
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* @param span the target span
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* @param axis the axis that is examined
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* @param offsets an empty array, filled with the offsets of the children
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* @param spans an empty array, filled with the spans of the children
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*/
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protected void baselineLayout(int span, int axis, int[] offsets,
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int[] spans)
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{
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if (axis == myAxis)
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layoutMajorAxis(span, axis, offsets, spans);
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else
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layoutMinorAxis(span, axis, offsets, spans);
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}
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/**
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* Calculates the size requirements of this <code>BoxView</code> along
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* its major axis, that is the axis specified in the constructor.
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*
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* @param axis the axis that is examined
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* @param sr the <code>SizeRequirements</code> object to hold the result,
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* if <code>null</code>, a new one is created
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*
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* @return the size requirements for this <code>BoxView</code> along
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* the specified axis
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*/
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protected SizeRequirements calculateMajorAxisRequirements(int axis,
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SizeRequirements sr)
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{
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SizeRequirements[] childReqs = getChildRequirements(axis);
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return SizeRequirements.getTiledSizeRequirements(childReqs);
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}
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/**
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* Calculates the size requirements of this <code>BoxView</code> along
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* its minor axis, that is the axis opposite to the axis specified in the
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* constructor.
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*
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* @param axis the axis that is examined
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* @param sr the <code>SizeRequirements</code> object to hold the result,
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* if <code>null</code>, a new one is created
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*
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* @return the size requirements for this <code>BoxView</code> along
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* the specified axis
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*/
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protected SizeRequirements calculateMinorAxisRequirements(int axis,
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SizeRequirements sr)
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{
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SizeRequirements[] childReqs = getChildRequirements(axis);
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return SizeRequirements.getAlignedSizeRequirements(childReqs);
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}
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/**
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* Returns <code>true</code> if the specified point lies before the
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* given <code>Rectangle</code>, <code>false</code> otherwise.
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*
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* "Before" is typically defined as being to the left or above.
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*
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* @param x the X coordinate of the point
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* @param y the Y coordinate of the point
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* @param r the rectangle to test the point against
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*
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* @return <code>true</code> if the specified point lies before the
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* given <code>Rectangle</code>, <code>false</code> otherwise
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*/
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protected boolean isBefore(int x, int y, Rectangle r)
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{
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boolean result = false;
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if (myAxis == X_AXIS)
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result = x < r.x;
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else
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result = y < r.y;
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return result;
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}
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/**
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* Returns <code>true</code> if the specified point lies after the
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* given <code>Rectangle</code>, <code>false</code> otherwise.
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*
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* "After" is typically defined as being to the right or below.
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*
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* @param x the X coordinate of the point
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* @param y the Y coordinate of the point
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* @param r the rectangle to test the point against
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*
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* @return <code>true</code> if the specified point lies after the
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* given <code>Rectangle</code>, <code>false</code> otherwise
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*/
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protected boolean isAfter(int x, int y, Rectangle r)
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{
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boolean result = false;
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if (myAxis == X_AXIS)
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result = x > r.x;
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else
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result = y > r.y;
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return result;
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}
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/**
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* Returns the child <code>View</code> at the specified location.
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*
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* @param x the X coordinate
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* @param y the Y coordinate
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* @param r the inner allocation of this <code>BoxView</code> on entry,
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* the allocation of the found child on exit
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*
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* @return the child <code>View</code> at the specified location
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*/
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protected View getViewAtPoint(int x, int y, Rectangle r)
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{
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View result = null;
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int count = getViewCount();
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Rectangle copy = new Rectangle(r);
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for (int i = 0; i < count; ++i)
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{
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copy.setBounds(r);
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childAllocation(i, r);
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if (copy.contains(x, y))
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{
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result = getView(i);
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break;
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}
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}
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return result;
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}
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/**
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* Computes the allocation for a child <code>View</code>. The parameter
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* <code>a</code> stores the allocation of this <code>CompositeView</code>
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* and is then adjusted to hold the allocation of the child view.
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*
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* @param index the index of the child <code>View</code>
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* @param a the allocation of this <code>CompositeView</code> before the
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* call, the allocation of the child on exit
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*/
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protected void childAllocation(int index, Rectangle a)
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{
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if (! isAllocationValid())
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layout(a.width, a.height);
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a.x += offsetsX[index];
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a.y += offsetsY[index];
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a.width = spansX[index];
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a.height = spansY[index];
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}
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/**
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* Lays out the children of this <code>BoxView</code> with the specified
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* bounds.
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*
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* @param width the width of the allocated region for the children (that
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* is the inner allocation of this <code>BoxView</code>
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* @param height the height of the allocated region for the children (that
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* is the inner allocation of this <code>BoxView</code>
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*/
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protected void layout(int width, int height)
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{
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baselineLayout(width, X_AXIS, offsetsX, spansX);
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baselineLayout(height, Y_AXIS, offsetsY, spansY);
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}
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/**
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* Performs the layout along the major axis of a <code>BoxView</code>.
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*
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* @param targetSpan the (inner) span of the <code>BoxView</code> in which
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* to layout the children
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* @param axis the axis along which the layout is performed
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* @param offsets the array that holds the offsets of the children on exit
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* @param spans the array that holds the spans of the children on exit
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*/
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protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets,
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int[] spans)
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{
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|
SizeRequirements[] childReqs = getChildRequirements(axis);
|
|
// Calculate the spans and offsets using the SizeRequirements uility
|
|
// methods.
|
|
SizeRequirements.calculateTiledPositions(targetSpan, null, childReqs,
|
|
offsets, spans);
|
|
validateLayout(axis);
|
|
}
|
|
|
|
/**
|
|
* Performs the layout along the minor axis of a <code>BoxView</code>.
|
|
*
|
|
* @param targetSpan the (inner) span of the <code>BoxView</code> in which
|
|
* to layout the children
|
|
* @param axis the axis along which the layout is performed
|
|
* @param offsets the array that holds the offsets of the children on exit
|
|
* @param spans the array that holds the spans of the children on exit
|
|
*/
|
|
protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets,
|
|
int[] spans)
|
|
{
|
|
SizeRequirements[] childReqs = getChildRequirements(axis);
|
|
// Calculate the spans and offsets using the SizeRequirements uility
|
|
// methods.
|
|
// TODO: This might be an opportunity for performance optimization. Here
|
|
// we could use a cached instance of SizeRequirements instead of passing
|
|
// null to baselineRequirements. However, this would involve rewriting
|
|
// the baselineRequirements() method to not use the SizeRequirements
|
|
// utility method, since they cannot reuse a cached instance.
|
|
SizeRequirements total = baselineRequirements(axis, null);
|
|
SizeRequirements.calculateAlignedPositions(targetSpan, total, childReqs,
|
|
offsets, spans);
|
|
validateLayout(axis);
|
|
}
|
|
|
|
/**
|
|
* Returns <code>true</code> if the cached allocations for the children
|
|
* are still valid, <code>false</code> otherwise.
|
|
*
|
|
* @return <code>true</code> if the cached allocations for the children
|
|
* are still valid, <code>false</code> otherwise
|
|
*/
|
|
protected boolean isAllocationValid()
|
|
{
|
|
return isLayoutValid(X_AXIS) && isLayoutValid(Y_AXIS);
|
|
}
|
|
|
|
/**
|
|
* Return the current width of the box. This is the last allocated width.
|
|
*
|
|
* @return the current width of the box
|
|
*/
|
|
public int getWidth()
|
|
{
|
|
return width;
|
|
}
|
|
|
|
/**
|
|
* Return the current height of the box. This is the last allocated height.
|
|
*
|
|
* @return the current height of the box
|
|
*/
|
|
public int getHeight()
|
|
{
|
|
return height;
|
|
}
|
|
|
|
/**
|
|
* Sets the size of the view. If the actual size has changed, the layout
|
|
* is updated accordingly.
|
|
*
|
|
* @param width the new width
|
|
* @param height the new height
|
|
*/
|
|
public void setSize(float width, float height)
|
|
{
|
|
if (this.width != (int) width)
|
|
layoutChanged(X_AXIS);
|
|
if (this.height != (int) height)
|
|
layoutChanged(Y_AXIS);
|
|
|
|
this.width = (int) width;
|
|
this.height = (int) height;
|
|
|
|
Rectangle outside = new Rectangle(0, 0, this.width, this.height);
|
|
Rectangle inside = getInsideAllocation(outside);
|
|
if (!isAllocationValid())
|
|
layout(inside.width, inside.height);
|
|
}
|
|
|
|
/**
|
|
* Sets the layout to valid for a specific axis.
|
|
*
|
|
* @param axis the axis for which to validate the layout
|
|
*/
|
|
void validateLayout(int axis)
|
|
{
|
|
if (axis == X_AXIS)
|
|
xLayoutValid = true;
|
|
if (axis == Y_AXIS)
|
|
yLayoutValid = true;
|
|
}
|
|
|
|
/**
|
|
* Returns the size requirements of this view's children for the major
|
|
* axis.
|
|
*
|
|
* @return the size requirements of this view's children for the major
|
|
* axis
|
|
*/
|
|
SizeRequirements[] getChildRequirements(int axis)
|
|
{
|
|
// Allocate SizeRequirements for each child view.
|
|
int count = getViewCount();
|
|
SizeRequirements[] childReqs = new SizeRequirements[count];
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
View view = getView(i);
|
|
childReqs[i] = new SizeRequirements((int) view.getMinimumSpan(axis),
|
|
(int) view.getPreferredSpan(axis),
|
|
(int) view.getMaximumSpan(axis),
|
|
view.getAlignment(axis));
|
|
}
|
|
return childReqs;
|
|
}
|
|
|
|
/**
|
|
* Returns the span for the child view with the given index for the specified
|
|
* axis.
|
|
*
|
|
* @param axis the axis to examine, either <code>X_AXIS</code> or
|
|
* <code>Y_AXIS</code>
|
|
* @param childIndex the index of the child for for which to return the span
|
|
*
|
|
* @return the span for the child view with the given index for the specified
|
|
* axis
|
|
*/
|
|
protected int getSpan(int axis, int childIndex)
|
|
{
|
|
if (axis == X_AXIS)
|
|
return spansX[childIndex];
|
|
else
|
|
return spansY[childIndex];
|
|
}
|
|
|
|
/**
|
|
* Returns the offset for the child view with the given index for the
|
|
* specified axis.
|
|
*
|
|
* @param axis the axis to examine, either <code>X_AXIS</code> or
|
|
* <code>Y_AXIS</code>
|
|
* @param childIndex the index of the child for for which to return the span
|
|
*
|
|
* @return the offset for the child view with the given index for the
|
|
* specified axis
|
|
*/
|
|
protected int getOffset(int axis, int childIndex)
|
|
{
|
|
if (axis == X_AXIS)
|
|
return offsetsX[childIndex];
|
|
else
|
|
return offsetsY[childIndex];
|
|
}
|
|
|
|
/**
|
|
* Returns the alignment for this box view for the specified axis. The
|
|
* axis that is tiled (the major axis) will be requested to be aligned
|
|
* centered (0.5F). The minor axis alignment depends on the child view's
|
|
* total alignment.
|
|
*
|
|
* @param axis the axis which is examined
|
|
*
|
|
* @return the alignment for this box view for the specified axis
|
|
*/
|
|
public float getAlignment(int axis)
|
|
{
|
|
if (axis == myAxis)
|
|
return 0.5F;
|
|
else
|
|
return baselineRequirements(axis, null).alignment;
|
|
}
|
|
|
|
/**
|
|
* Called by a child View when its preferred span has changed.
|
|
*
|
|
* @param width indicates that the preferred width of the child changed.
|
|
* @param height indicates that the preferred height of the child changed.
|
|
* @param child the child View.
|
|
*/
|
|
public void preferenceChanged (View child, boolean width, boolean height)
|
|
{
|
|
if (width)
|
|
xLayoutValid = false;
|
|
if (height)
|
|
yLayoutValid = false;
|
|
super.preferenceChanged(child, width, height);
|
|
}
|
|
}
|