net.miginfocom.layout.LayoutUtil Maven / Gradle / Ivy
package net.miginfocom.layout;
import java.beans.*;
import java.io.*;
import java.util.IdentityHashMap;
import java.util.TreeSet;
import java.util.WeakHashMap;
/*
* License (BSD):
* ==============
*
* Copyright (c) 2004, Mikael Grev, MiG InfoCom AB. (miglayout (at) miginfocom (dot) com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
* Neither the name of the MiG InfoCom AB nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* @version 1.0
* @author Mikael Grev, MiG InfoCom AB
* Date: 2006-sep-08
*/
/** A utility class that has only static helper methods.
*/
public final class LayoutUtil
{
/** A substitute value for aa really large value. Integer.MAX_VALUE is not used since that means a lot of defensive code
* for potential overflow must exist in many places. This value is large enough for being unresonable yet it is hard to
* overflow.
*/
static final int INF = (Integer.MAX_VALUE >> 10) - 100; // To reduce likelyhood of overflow errors when calculating.
/** Tag int for a value that in considered "not set". Used as "null" element in int arays.
*/
static final int NOT_SET = Integer.MIN_VALUE + 12346; // Magic value...
// Index for the different sizes
public static final int MIN = 0;
public static final int PREF = 1;
public static final int MAX = 2;
private static WeakHashMap CR_MAP = null;
private static WeakHashMap DT_MAP = null; // The Containers that have design time. Value not used.
private static int eSz = 15;
private LayoutUtil()
{
}
/** Returns the current version of MiG Layout.
* @return The current version of MiG Layout.
*/
public static String getVersion()
{
return "3.5.5";
}
/** Sets if design time is turned on for a Container in {@link ContainerWrapper}.
* @param cw The container to set design time for. null is legal and can be used as
* a key to turn on/off design time "in general". Note though that design time "in general" is
* always on as long as there is at least one ContainerWrapper with design time.
*
* If this method has not ever been called it will default to what
* Beans.isDesignTime() returns. This means that if you call
* this method you indicate that you will take responsibility for the design time value.
* @param b true means design time on.
*/
public static void setDesignTime(ContainerWrapper cw, boolean b)
{
if (DT_MAP == null)
DT_MAP = new WeakHashMap();
DT_MAP.put((cw != null ? cw.getComponent() : null), new Boolean(b));
}
/** Returns if design time is turned on for a Container in {@link ContainerWrapper}.
* @param cw The container to set design time for. null is legal will return true
* if there is at least one ContainerWrapper (or null) that have design time
* turned on.
* @return If design time is set for cw.
*/
public static boolean isDesignTime(ContainerWrapper cw)
{
if (DT_MAP == null)
return Beans.isDesignTime();
if (cw != null && DT_MAP.containsKey(cw.getComponent()) == false)
cw = null;
Boolean b = DT_MAP.get(cw != null ? cw.getComponent() : null);
return b != null && b.booleanValue();
}
/** The size of an empty row or columns in a grid during design time.
* @return The number of pixels. Default is 15.
*/
public static int getDesignTimeEmptySize()
{
return eSz;
}
/** The size of an empty row or columns in a grid during design time.
* @param pixels The number of pixels. Default is 15.
*/
public static void setDesignTimeEmptySize(int pixels)
{
eSz = pixels;
}
/** Associates con with the creation string s. The con object should
* probably have an equals method that compares identities or con objects that .equals() will only
* be able to have one creation string.
*
* If {@link LayoutUtil#isDesignTime(ContainerWrapper)} returns false the method does nothing.
* @param con The object. if null the method does nothing.
* @param s The creation string. if null the method does nothing.
*/
static void putCCString(Object con, String s)
{
if (s != null && con != null && isDesignTime(null)) {
if (CR_MAP == null)
CR_MAP = new WeakHashMap(64);
CR_MAP.put(con, s);
}
}
/** Sets/add the persistence delagates to be used for a class.
* @param c The class to set the registered deligate for.
* @param del The new deligate or null to erase to old one.
*/
static synchronized void setDelegate(Class c, PersistenceDelegate del)
{
try {
Introspector.getBeanInfo(c).getBeanDescriptor().setValue("persistenceDelegate", del);
} catch (Exception e1) {
}
}
/** Returns strings set with {@link #putCCString(Object, String)} or null if nothing is associated or
* {@link LayoutUtil#isDesignTime(ContainerWrapper)} returns false.
* @param con The constraitn object.
* @return The creation string or null if nothing is registered with the con object.
*/
static String getCCString(Object con)
{
return CR_MAP != null ? CR_MAP.get(con) : null;
}
static void throwCC()
{
throw new IllegalStateException("setStoreConstraintData(true) must be set for strings to be saved.");
}
/** Takes a number on min/preferred/max sizes and resize constraints and returns the calculated sizes which sum should add up to bounds. Whether the sum
* will actually equal bounds is dependent om the pref/max sizes and resise constraints.
* @param sizes [ix],[MIN][PREF][MAX]. Grid.CompWrap.NOT_SET will be treated as N/A or 0. A "[MIN][PREF][MAX]" array with null elements will be interpreted as very flexible (no bounds)
* but if the array itself is null it will not get any size.
* @param resConstr Elements can be null and the whole array can be null. null means that the size will not be flexible at all.
* Can have length less than sizes in which case the last element should be used for the elements missing.
* @param defGrowWeights If there is no grow weight for a resConstr the correspinding value of this array is used.
* These forced resConstr will be grown last though and only if needed to fill to the bounds.
* @param startSizeType The initial size to use. E.g. {@link net.miginfocom.layout.LayoutUtil#MIN}.
* @param bounds To use for relative sizes.
* @return The sizes. Array length will match sizes.
*/
static int[] calculateSerial(int[][] sizes, ResizeConstraint[] resConstr, Float[] defGrowWeights, int startSizeType, int bounds)
{
float[] lengths = new float[sizes.length]; // heights/widths that are set
float usedLength = 0.0f;
// Give all preferred size to start with
for (int i = 0; i < sizes.length; i++) {
if (sizes[i] != null) {
float len = sizes[i][startSizeType] != NOT_SET ? sizes[i][startSizeType] : 0;
int newSizeBounded = getBrokenBoundary(len, sizes[i][MIN], sizes[i][MAX]);
if (newSizeBounded != NOT_SET)
len = newSizeBounded;
usedLength += len;
lengths[i] = len;
}
}
int useLengthI = Math.round(usedLength);
if (useLengthI != bounds && resConstr != null) {
boolean isGrow = useLengthI < bounds;
// Create a Set with the available priorities
TreeSet prioList = new TreeSet();
for (int i = 0; i < sizes.length; i++) {
ResizeConstraint resC = (ResizeConstraint) getIndexSafe(resConstr, i);
if (resC != null)
prioList.add(new Integer(isGrow ? resC.growPrio : resC.shrinkPrio));
}
Integer[] prioIntegers = prioList.toArray(new Integer[prioList.size()]);
for (int force = 0; force <= ((isGrow && defGrowWeights != null) ? 1 : 0); force++) { // Run twice if defGrow and the need for growing.
for (int pr = prioIntegers.length - 1; pr >= 0; pr--) {
int curPrio = prioIntegers[pr].intValue();
float totWeight = 0f;
Float[] resizeWeight = new Float[sizes.length];
for (int i = 0; i < sizes.length; i++) {
if (sizes[i] == null) // if no min/pref/max size at all do not grow or shrink.
continue;
ResizeConstraint resC = (ResizeConstraint) getIndexSafe(resConstr, i);
if (resC != null) {
int prio = isGrow ? resC.growPrio : resC.shrinkPrio;
if (curPrio == prio) {
if (isGrow) {
resizeWeight[i] = (force == 0 || resC.grow != null) ? resC.grow : (defGrowWeights[i < defGrowWeights.length ? i : defGrowWeights.length - 1]);
} else {
resizeWeight[i] = resC.shrink;
}
if (resizeWeight[i] != null)
totWeight += resizeWeight[i].floatValue();
}
}
}
if (totWeight > 0f) {
boolean hit;
do {
float toChange = bounds - usedLength;
hit = false;
float changedWeight = 0f;
for (int i = 0; i < sizes.length && totWeight > 0.0001f; i++) {
Float weight = resizeWeight[i];
if (weight != null) {
float sizeDelta = toChange * weight.floatValue() / totWeight;
float newSize = lengths[i] + sizeDelta;
if (sizes[i] != null) {
int newSizeBounded = getBrokenBoundary(newSize, sizes[i][MIN], sizes[i][MAX]);
if (newSizeBounded != NOT_SET) {
resizeWeight[i] = null;
hit = true;
changedWeight += weight.floatValue();
newSize = newSizeBounded;
sizeDelta = newSize - lengths[i];
}
}
lengths[i] = newSize;
usedLength += sizeDelta;
}
}
totWeight -= changedWeight;
} while (hit);
}
}
}
}
return roundSizes(lengths);
}
static Object getIndexSafe(Object[] arr, int ix)
{
return arr != null ? arr[ix < arr.length ? ix : arr.length - 1] : null;
}
/** Returns the broken boundary if sz is outside the boundaries lower or upper. If both boundaries
* are broken, the lower one is returned. If sz is < 0 then new Float(0f) is returned so that no sizes can be
* negative.
* @param sz The size to check
* @param lower The lower boundary (or null fo no boundary).
* @param upper The upper boundary (or null fo no boundary).
* @return The broken boundary or null if no boundary was broken.
*/
private static int getBrokenBoundary(float sz, int lower, int upper)
{
if (lower != NOT_SET) {
if (sz < lower)
return new Integer(lower);
} else if (sz < 0f) {
return new Integer(0);
}
if (upper != NOT_SET && sz > upper)
return new Integer(upper);
return NOT_SET;
}
static int sum(int[] terms, int start, int len)
{
int s = 0;
for (int i = start, iSz = start + len; i < iSz; i++)
s += terms[i];
return s;
}
static int sum(int[] terms)
{
return sum(terms, 0, terms.length);
}
public static int getSizeSafe(int[] sizes, int sizeType)
{
if (sizes == null || sizes[sizeType] == NOT_SET)
return sizeType == MAX ? LayoutUtil.INF : 0;
return sizes[sizeType];
}
static BoundSize derive(BoundSize bs, UnitValue min, UnitValue pref, UnitValue max)
{
if (bs == null || bs.isUnset())
return new BoundSize(min, pref, max, null);
return new BoundSize(
min != null ? min : bs.getMin(),
pref != null ? pref : bs.getPreferred(),
max != null ? max : bs.getMax(),
bs.getGapPush(),
null);
}
/** Returns if left-to-right orientation is used. If not set explicitly in the layout constraints the Locale
* of the parent is used.
* @param lc The constraint if there is one. Can be null.
* @param container The parent that may be used to get the left-to-right if ffc does not specify this.
* @return If left-to-right orientation is currently used.
*/
public final static boolean isLeftToRight(LC lc, ContainerWrapper container)
{
if (lc != null && lc.getLeftToRight() != null)
return lc.getLeftToRight().booleanValue();
return container == null || container.isLeftToRight();
}
/** Round a number of float sizes into int sizes so that the total length match up
* @param sizes The sizes to round
* @return An array of equal length as sizes.
*/
static int[] roundSizes(float[] sizes)
{
int[] retInts = new int[sizes.length];
float posD = 0;
for (int i = 0; i < retInts.length; i++) {
int posI = (int) (posD + 0.5f);
posD += sizes[i];
retInts[i] = (int) (posD + 0.5f) - posI;
}
return retInts;
}
/** Safe equals. null == null, but null never equals anything else.
* @param o1 The first object. May be null.
* @param o2 The second object. May be null.
* @return Returns true if o1 and o2 are equal (using .equals()) or both are null.
*/
static final boolean equals(Object o1, Object o2)
{
return o1 == o2 || (o1 != null && o2 != null && o1.equals(o2));
}
// static int getBaselineCorrect(Component comp)
// {
// Dimension pSize = comp.getPreferredSize();
// int baseline = comp.getBaseline(pSize.width, pSize.height);
// int nextBaseline = comp.getBaseline(pSize.width, pSize.height + 1);
//
// // Amount to add to height when calculating where baseline
// // lands for a particular height:
// int padding = 0;
//
// // Where the baseline is relative to the mid point
// int baselineOffset = baseline - pSize.height / 2;
// if (pSize.height % 2 == 0 && baseline != nextBaseline) {
// padding = 1;
// } else if (pSize.height % 2 == 1 && baseline == nextBaseline) {
// baselineOffset--;
// padding = 1;
// }
//
// // The following calculates where the baseline lands for
// // the height z:
// return (pSize.height + padding) / 2 + baselineOffset;
// }
/** Returns the inset for the side.
* @param side top == 0, left == 1, bottom = 2, right = 3.
* @param getDefault If true the default insets will get retrieved if lc has none set.
* @return The inset for the side. Never null.
*/
static final UnitValue getInsets(LC lc, int side, boolean getDefault)
{
UnitValue[] i = lc.getInsets();
return (i != null && i[side] != null) ? i[side] : (getDefault ? PlatformDefaults.getPanelInsets(side) : UnitValue.ZERO);
}
/** Writes the objet and CLOSES the stream. Uses the persistence delegate registered in this class.
* @param os The stream to write to. Will be closed.
* @param o The object to be serialized.
* @param listener The listener to recieve the exeptions if there are any. If null not used.
*/
static void writeXMLObject(OutputStream os, Object o, ExceptionListener listener)
{
ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(LayoutUtil.class.getClassLoader());
XMLEncoder encoder = new XMLEncoder(os);
if (listener != null)
encoder.setExceptionListener(listener);
encoder.writeObject(o);
encoder.close(); // Must be closed to write.
Thread.currentThread().setContextClassLoader(oldClassLoader);
}
private static ByteArrayOutputStream writeOutputStream = null;
/** Writes an object to XML.
* @param out The boject out to write to. Will not be closed.
* @param o The object to write.
*/
public static synchronized void writeAsXML(ObjectOutput out, Object o) throws IOException
{
if (writeOutputStream == null)
writeOutputStream = new ByteArrayOutputStream(16384);
writeOutputStream.reset();
writeXMLObject(writeOutputStream, o, new ExceptionListener() {
public void exceptionThrown(Exception e) {
e.printStackTrace();
}});
byte[] buf = writeOutputStream.toByteArray();
out.writeInt(buf.length);
out.write(buf);
}
private static byte[] readBuf = null;
/** Reads an object from in using the
* @param in The object input to read from.
* @return The object. Never null.
* @throws IOException If there was a problem saving as XML
*/
public static synchronized Object readAsXML(ObjectInput in) throws IOException
{
if (readBuf == null)
readBuf = new byte[16384];
Thread cThread = Thread.currentThread();
ClassLoader oldCL = null;
try {
oldCL = cThread.getContextClassLoader();
cThread.setContextClassLoader(LayoutUtil.class.getClassLoader());
} catch(SecurityException e) {
}
Object o = null;
try {
int length = in.readInt();
if (length > readBuf.length)
readBuf = new byte[length];
in.readFully(readBuf, 0, length);
o = new XMLDecoder(new ByteArrayInputStream(readBuf, 0, length)).readObject();
} catch(EOFException e) {
}
if (oldCL != null)
cThread.setContextClassLoader(oldCL);
return o;
}
private static final IdentityHashMap SER_MAP = new IdentityHashMap(2);
/** Sets the serialized object and associates it with caller.
* @param caller The objec created o
* @param o The just serialized object.
*/
public static void setSerializedObject(Object caller, Object o)
{
synchronized(SER_MAP) {
SER_MAP.put(caller, o);
}
}
/** Returns the serialized object that are associated with caller. It also removes it from the list.
* @param caller The original creator of the object.
* @return The object.
*/
public static Object getSerializedObject(Object caller)
{
synchronized(SER_MAP) {
return SER_MAP.remove(caller);
}
}
}