package net.miginfocom.swt;
/*
* 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
*/
import net.miginfocom.layout.*;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Layout;
import java.io.*;
import java.lang.ref.WeakReference;
import java.util.*;
/** A very flexible layout manager.
* <p>
* Read the documentation that came with this layout manager for information on usage.
*/
public final class MigLayout extends Layout implements Externalizable
{
static {
// Mac Swing defaults to 96 DPI from Java6 though SWT is still on 72.
if (PlatformDefaults.getPlatform() == PlatformDefaults.MAC_OSX)
PlatformDefaults.setDefaultDPI(72);
}
// ******** Instance part ********
/** The component to string constraints mappings.
*/
private final Map<Control, Object> scrConstrMap = new IdentityHashMap<Control, Object>(8);
/** Hold the serializable text representation of the constraints.
*/
private Object layoutConstraints = "", colConstraints = "", rowConstraints = ""; // Should never be null!
// ******** Transient part ********
private transient ContainerWrapper cacheParentW = null;
private transient final Map<ComponentWrapper, CC> ccMap = new HashMap<ComponentWrapper, CC>(8);
private transient LC lc = null;
private transient AC colSpecs = null, rowSpecs = null;
private transient Grid grid = null;
private transient java.util.Timer debugTimer = null;
private transient long curDelay = -1;
private transient int lastModCount = PlatformDefaults.getModCount();
private transient int lastHash = -1;
private transient ArrayList<LayoutCallback> callbackList = null;
/** Constructor with no constraints.
*/
public MigLayout()
{
this("", "", "");
}
/** Constructor.
* @param layoutConstraints The constraints that concern the whole layout. <code>null</code> will be treated as "".
*/
public MigLayout(String layoutConstraints)
{
this(layoutConstraints, "", "");
}
/** Constructor.
* @param layoutConstraints The constraints that concern the whole layout. <code>null</code> will be treated as "".
* @param colConstraints The constraints for the columns in the grid. <code>null</code> will be treated as "".
*/
public MigLayout(String layoutConstraints, String colConstraints)
{
this(layoutConstraints, colConstraints, "");
}
/** Constructor.
* @param layoutConstraints The constraints that concern the whole layout. <code>null</code> will be treated as "".
* @param colConstraints The constraints for the columns in the grid. <code>null</code> will be treated as "".
* @param rowConstraints The constraints for the rows in the grid. <code>null</code> will be treated as "".
*/
public MigLayout(String layoutConstraints, String colConstraints, String rowConstraints)
{
setLayoutConstraints(layoutConstraints);
setColumnConstraints(colConstraints);
setRowConstraints(rowConstraints);
}
/** Constructor.
* @param layoutConstraints The constraints that concern the whole layout. <code>null</code> will be treated as an empty cosntraint.
*/
public MigLayout(LC layoutConstraints)
{
this(layoutConstraints, null, null);
}
/** Constructor.
* @param layoutConstraints The constraints that concern the whole layout. <code>null</code> will be treated as an empty cosntraint.
* @param colConstraints The constraints for the columns in the grid. <code>null</code> will be treated as an empty constraint.
*/
public MigLayout(LC layoutConstraints, AC colConstraints)
{
this(layoutConstraints, colConstraints, null);
}
/** Constructor.
* @param layoutConstraints The constraints that concern the whole layout. <code>null</code> will be treated as an empty cosntraint.
* @param colConstraints The constraints for the columns in the grid. <code>null</code> will be treated as an empty constraint.
* @param rowConstraints The constraints for the rows in the grid. <code>null</code> will be treated as an empty constraint.
*/
public MigLayout(LC layoutConstraints, AC colConstraints, AC rowConstraints)
{
setLayoutConstraints(layoutConstraints);
setColumnConstraints(colConstraints);
setRowConstraints(rowConstraints);
}
/** Returns layout constraints either as a <code>String</code> or {@link net.miginfocom.layout.LC} depending what was sent in
* to the constructor or set with {@link #setLayoutConstraints(Object)}.
* @return The layout constraints eighter as a <code>String</code> or {@link net.miginfocom.layout.LC} depending what was sent in
* to the constructor or set with {@link #setLayoutConstraints(Object)}. Never <code>null</code>.
*/
public Object getLayoutConstraints()
{
return layoutConstraints;
}
/** Sets the layout constraints for the layout manager instance as a String.
* <p>
* See the class JavaDocs for information on how this string is formatted.
* @param s The layout constraints as a String representation. <code>null</code> is converted to <code>""</code> for storage.
* @throws RuntimeException if the constraint was not valid.
*/
public void setLayoutConstraints(Object s)
{
if (s == null || s instanceof String) {
s = ConstraintParser.prepare((String) s);
lc = ConstraintParser.parseLayoutConstraint((String) s);
} else if (s instanceof LC) {
lc = (LC) s;
} else {
throw new IllegalArgumentException("Illegal constraint type: " + s.getClass().toString());
}
layoutConstraints = s;
grid = null;
}
/** Returns the column layout constraints either as a <code>String</code> or {@link net.miginfocom.layout.AC}.
* @return The column constraints eighter as a <code>String</code> or {@link net.miginfocom.layout.LC} depending what was sent in
* to the constructor or set with {@link #setLayoutConstraints(Object)}. Never <code>null</code>.
*/
public Object getColumnConstraints()
{
return colConstraints;
}
/** Sets the column layout constraints for the layout manager instance as a String.
* <p>
* See the class JavaDocs for information on how this string is formatted.
* @param constr The column layout constraints as a String representation. <code>null</code> is converted to <code>""</code> for storage.
* @throws RuntimeException if the constraint was not valid.
*/
public void setColumnConstraints(Object constr)
{
if (constr == null || constr instanceof String) {
constr = ConstraintParser.prepare((String) constr);
colSpecs = ConstraintParser.parseColumnConstraints((String) constr);
} else if (constr instanceof AC) {
colSpecs = (AC) constr;
} else {
throw new IllegalArgumentException("Illegal constraint type: " + constr.getClass().toString());
}
colConstraints = constr;
grid = null;
}
/** Returns the row layout constraints as a String representation. This string is the exact string as set with {@link #setRowConstraints(Object)}
* or sent into the constructor.
* <p>
* See the class JavaDocs for information on how this string is formatted.
* @return The row layout constraints as a String representation. Never <code>null</code>.
*/
public Object getRowConstraints()
{
return rowConstraints;
}
/** Sets the row layout constraints for the layout manager instance as a String.
* <p>
* See the class JavaDocs for information on how this string is formatted.
* @param constr The row layout constraints as a String representation. <code>null</code> is converted to <code>""</code> for storage.
* @throws RuntimeException if the constaint was not valid.
*/
public void setRowConstraints(Object constr)
{
if (constr == null || constr instanceof String) {
constr = ConstraintParser.prepare((String) constr);
rowSpecs = ConstraintParser.parseRowConstraints((String) constr);
} else if (constr instanceof AC) {
rowSpecs = (AC) constr;
} else {
throw new IllegalArgumentException("Illegal constraint type: " + constr.getClass().toString());
}
rowConstraints = constr;
grid = null;
}
/** Returns a shallow copy of the constraints map.
* @return A shallow copy of the constraints map. Never <code>null</code>.
*/
public Map<Control, Object> getConstraintMap()
{
return new IdentityHashMap<Control, Object>(scrConstrMap);
}
/** Sets the constraints map.
* @param map The map. Will be copied.
*/
public void setConstraintMap(Map<Control, Object> map)
{
scrConstrMap.clear();
ccMap.clear();
for (Map.Entry<Control, Object> e : map.entrySet())
setComponentConstraintsImpl(e.getKey(), e.getValue(), true);
}
/** Sets the component constraint for the component that already must be handleded by this layout manager.
* <p>
* See the class JavaDocs for information on how this string is formatted.
* @param constr The component constraints as a String or {@link net.miginfocom.layout.CC}. <code>null</code> is ok.
* @param comp The component to set the constraints for.
* @param noCheck Doesn't check if control already is managed.
* @throws RuntimeException if the constaint was not valid.
* @throws IllegalArgumentException If the component is not handling the component.
*/
private void setComponentConstraintsImpl(Control comp, Object constr, boolean noCheck)
{
if (noCheck == false && scrConstrMap.containsKey(comp) == false)
throw new IllegalArgumentException("Component must already be added to parent!");
ComponentWrapper cw = new SwtComponentWrapper(comp);
if (constr == null || constr instanceof String) {
String cStr = ConstraintParser.prepare((String) constr);
scrConstrMap.put(comp, constr);
ccMap.put(cw, ConstraintParser.parseComponentConstraint(cStr));
} else if (constr instanceof CC) {
scrConstrMap.put(comp, constr);
ccMap.put(cw, (CC) constr);
} else {
throw new IllegalArgumentException("Constraint must be String or ComponentConstraint: " + constr.getClass().toString());
}
grid = null;
}
/** Returns if this layout manager is currently managing this component.
* @param c The component to check. If <code>null</code> then <code>false</code> will be returned.
* @return If this layout manager is currently managing this component.
*/
public boolean isManagingComponent(Control c)
{
return scrConstrMap.containsKey(c);
}
/** Adds the callback function that will be called at different stages of the layout cycle.
* @param callback The callback. Not <code>null</code>.
*/
public void addLayoutCallback(LayoutCallback callback)
{
if (callback == null)
throw new NullPointerException();
if (callbackList == null)
callbackList = new ArrayList<LayoutCallback>(1);
callbackList.add(callback);
}
/** Removes the callback if it exists.
* @param callback The callback. May be <code>null</code>.
*/
public void removeLayoutCallback(LayoutCallback callback)
{
if (callbackList != null)
callbackList.remove(callback);
}
/** Sets the debugging state for this layout manager instance. If debug is turned on a timer will repaint the last laid out parent
* with debug information on top.
* <p>
* Red fill and dashed dark red outline is used to indicate occupied cells in the grid. Blue dashed outline indicate
* component bounds set.
* <p>
* Note that debug can also be set on the layout constraints. There it will be persisted. The value set here will not. See the class
* JavaDocs for information.
* @param parentW The parent. Never <code>null</code>.
* @param b <code>true</code> means debug is turned on.
*/
private synchronized void setDebug(final ComponentWrapper parentW, boolean b)
{
if (b && (debugTimer == null || curDelay != getDebugMillis())) {
if (debugTimer != null)
debugTimer.cancel();
debugTimer = new Timer(true);
curDelay = getDebugMillis();
debugTimer.schedule(new MyDebugRepaintTask(this), curDelay, curDelay);
ContainerWrapper pCW = parentW.getParent();
Composite parent = pCW != null ? (Composite) pCW.getComponent() : null;
if (parent != null)
parent.layout();
} else if (!b && debugTimer != null) {
debugTimer.cancel();
debugTimer = null;
}
}
/** Returns the current debugging state.
* @return The current debugging state.
*/
private boolean getDebug()
{
return debugTimer != null;
}
/** Returns the debug millis. Combines the value from {@link net.miginfocom.layout.LC#getDebugMillis()} and {@link net.miginfocom.layout.LayoutUtil#getGlobalDebugMillis()}
* @return The combined value.
*/
private int getDebugMillis()
{
int globalDebugMillis = LayoutUtil.getGlobalDebugMillis();
return globalDebugMillis > 0 ? globalDebugMillis : lc.getDebugMillis();
}
/** Check if something has changed and if so recreate it to the cached objects.
* @param parent The parent that is the target for this layout manager.
*/
private void checkCache(Composite parent)
{
if (parent == null)
return;
checkConstrMap(parent);
ContainerWrapper par = checkParent(parent);
// Check if the grid is valid
int mc = PlatformDefaults.getModCount();
if (lastModCount != mc) {
grid = null;
lastModCount = mc;
}
int hash = parent.getSize().hashCode();
for (ComponentWrapper cw : ccMap.keySet()) {
hash ^= cw.getLayoutHashCode();
hash += 285134905;
}
if (hash != lastHash) {
grid = null;
lastHash = hash;
}
setDebug(par, getDebugMillis() > 0);
if (grid == null)
grid = new Grid(par, lc, rowSpecs, colSpecs, ccMap, callbackList);
}
private boolean checkConstrMap(Composite parent)
{
Control[] comps = parent.getChildren();
boolean changed = comps.length != scrConstrMap.size();
if (changed == false) {
for (Control c : comps) {
if (scrConstrMap.get(c) != c.getLayoutData()) {
changed = true;
break;
}
}
}
if (changed) {
scrConstrMap.clear();
for (Control c : comps)
setComponentConstraintsImpl(c, c.getLayoutData(), true);
}
return changed;
}
private ContainerWrapper checkParent(Composite parent)
{
if (parent == null)
return null;
if (cacheParentW == null || cacheParentW.getComponent() != parent)
cacheParentW = new SwtContainerWrapper(parent);
return cacheParentW;
}
public float getLayoutAlignmentX(Composite parent)
{
return lc != null && lc.getAlignX() != null ? lc.getAlignX().getPixels(1, checkParent(parent), null) : 0;
}
public float getLayoutAlignmentY(Composite parent)
{
return lc != null && lc.getAlignY() != null ? lc.getAlignY().getPixels(1, checkParent(parent), null) : 0;
}
protected Point computeSize(Composite parent, int wHint, int hHint, boolean flushCache)
{
checkCache(parent);
int w = LayoutUtil.getSizeSafe(grid != null ? grid.getWidth() : null, LayoutUtil.PREF);
int h = LayoutUtil.getSizeSafe(grid != null ? grid.getHeight() : null, LayoutUtil.PREF);
return new Point(w, h);
}
protected void layout(Composite parent, boolean flushCache)
{
checkCache(parent);
Rectangle r = parent.getClientArea();
int[] b = new int[] {r.x, r.y, r.width, r.height};
final boolean layoutAgain = grid.layout(b, lc.getAlignX(), lc.getAlignY(), getDebug(), true);
if (layoutAgain) {
grid = null;
checkCache(parent);
grid.layout(b, lc.getAlignX(), lc.getAlignY(), getDebug(), false);
}
}
protected boolean flushCache(Control control)
{
grid = null;
return true;
}
// ************************************************
// Persistence Delegate and Serializable combined.
// ************************************************
private Object readResolve() throws ObjectStreamException
{
return LayoutUtil.getSerializedObject(this);
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
{
LayoutUtil.setSerializedObject(this, LayoutUtil.readAsXML(in));
}
public void writeExternal(ObjectOutput out) throws IOException
{
if (getClass() == MigLayout.class)
LayoutUtil.writeAsXML(out, this);
}
private static class MyDebugRepaintTask extends TimerTask
{
private final WeakReference<MigLayout> layoutRef;
private MyDebugRepaintTask(MigLayout layout)
{
this.layoutRef = new WeakReference<MigLayout>(layout);
}
public void run()
{
final MigLayout layout = layoutRef.get();
if (layout != null && layout.grid != null) {
Display.getDefault().asyncExec(new Runnable () {
public void run () {
if (layout.grid != null)
layout.grid.paintDebug();
}
});
}
}
}
}