Pastable version of Widget Mirror

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 <pre class="sunburst">/**
 * ================================================================
 * Enterprise Managerial
 * ================================================================
 *
 * Project Info: http://portus.sourceforge.net
 * Project Lead: Francesco Portus (portusgraphics@gmail.com);
 *
 * (C) Copyright 2005, by Francesco Portus
 *
 * @author Francesco Portus
 * @version 0.1
 *
 * This library is free software; you can redistribute it and/or modify it underthe terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */
package it.portus.view;

import java.util.ArrayList;
import java.util.Stack;
import java.util.Vector;

import com.trolltech.qt.core.QChildEvent;
import com.trolltech.qt.core.QCoreApplication;
import com.trolltech.qt.core.QEvent;
import com.trolltech.qt.core.QObject;
import com.trolltech.qt.core.QPoint;
import com.trolltech.qt.core.QRect;
import com.trolltech.qt.core.QSize;
import com.trolltech.qt.core.Qt;
import com.trolltech.qt.gui.QApplication;
import com.trolltech.qt.gui.QColor;
import com.trolltech.qt.gui.QGridLayout;
import com.trolltech.qt.gui.QImage;
import com.trolltech.qt.gui.QLineEdit;
import com.trolltech.qt.gui.QListWidget;
import com.trolltech.qt.gui.QPaintEvent;
import com.trolltech.qt.gui.QPainter;
import com.trolltech.qt.gui.QPushButton;
import com.trolltech.qt.gui.QRegion;
import com.trolltech.qt.gui.QVBoxLayout;
import com.trolltech.qt.gui.QWidget;

public class WidgetMirror extends QWidget {

static final int MIRROR_HEIGHT = 38;
 private QWidget m_widget;
 
 private boolean m_inPaintEvent = false;

public WidgetMirror(QWidget parent)
 {
 super(parent);
 m_widget = this;
 m_inPaintEvent = false;
 }

void setMirroredWidget(QWidget w)
 {
 if (m_widget != null) {
 m_widget.removeEventFilter(this);
 Stack&lt;QObject&gt; parentStack = new Stack&lt;QObject&gt;();
 parentStack.push(m_widget);
 while (!parentStack.isEmpty()) {
 QObject parent = parentStack.pop();
 for (QObject child : parent.children()) {
 child.removeEventFilter(this);
 parentStack.push(child);
 }
 }
 }
 m_widget = w;
 if (m_widget != null) {
 m_widget.installEventFilter(this);
 setSizePolicy(m_widget.sizePolicy());

Stack&lt;QObject&gt; parentStack = new Stack&lt;QObject&gt;();
 parentStack.push(m_widget);
 while (!parentStack.isEmpty()) {
 QObject parent = parentStack.pop();
 for (QObject child : parent.children()) {
 if (child.isWidgetType()) {
 child.installEventFilter(this);
 parentStack.push(child);
 }
 }
 }
 }
 }

public boolean eventFilter(QObject obj, QEvent event) {
 if (event.type() == QEvent.Type.ChildPolished) {
 QChildEvent e = (QChildEvent)event;
 QObject child = e.child();
 if (child.isWidgetType()) {
 child.installEventFilter(this);
 Stack&lt;QObject&gt; parentStack = new Stack&lt;QObject&gt;();
 parentStack.push(child);
 while (!parentStack.isEmpty()) {
 QObject parent = parentStack.pop();
 for (QObject c : parent.children()) {
 if (c.isWidgetType()) {
 c.installEventFilter(this);
 parentStack.push(c);
 }
 }
 }
 }
 } else if (!m_inPaintEvent &amp;&amp; obj.isWidgetType() &amp;&amp; event.type() == QEvent.Type.Paint) {
 QWidget w = (QWidget)obj;
 QPaintEvent pe = (QPaintEvent)event;
 QRect r = new QRect(pe.rect().topLeft(), pe.rect().bottomRight());
 final QPoint diff = w.mapTo(m_widget, new QPoint());
 r.translate(diff);
 int tmp = r.top();
 r.setTop(m_widget.height() - r.bottom() - 1);
 r.setBottom(m_widget.height() - tmp - 1);
 update(r);
 }
 return super.eventFilter(obj, event);
 }

protected void paintEvent(QPaintEvent e) {
 if (m_widget == null) {
 return;
 }

QRect dirty = new QRect(e.rect().topLeft(), e.rect().bottomRight());
 dirty.setHeight(Math.min(dirty.height(), MIRROR_HEIGHT));
 int tmp = dirty.top();
 dirty.setTop(m_widget.height() - dirty.bottom() - 1);
 dirty.setBottom(m_widget.height() - tmp - 1);

m_inPaintEvent = true;

QImage im = new QImage(e.rect().size(), QImage.Format.Format_ARGB32_Premultiplied);
 QRegion region = new QRegion(dirty);
 
 RenderFlags flags = new QWidget.RenderFlags(QWidget.RenderFlag.resolve(QWidget.RenderFlag.DrawWindowBackground.value() | QWidget.RenderFlag.DrawChildren.value()));
 m_widget.render(im, dirty.topLeft().multiply(-1), region, flags);// | QWidget::IgnoreMask);
 im = im.mirrored();

QImage alphaChannel = new QImage(im.size(), QImage.Format.Format_Indexed8);

Vector&lt;Integer&gt; s_colorTable = new Vector&lt;Integer&gt;();
 if (s_colorTable.isEmpty()) {
 //s_colorTable.setSize(256);
 for (int i = 0; i &lt; 256; ++i) {
 System.out.println(i);
 s_colorTable.add(i, QColor.fromRgb(i, i, i).rgb());
 }
 }

if (alphaChannel != null) {
 System.out.println(&quot;colors&quot;);
 }
 alphaChannel.setColorTable(s_colorTable);
 alphaChannel.fill(0);

final int maxAlpha = 100;
 for (int line = 0; line &lt; alphaChannel.height() &amp;&amp; line &lt; MIRROR_HEIGHT - e.rect().top(); ++line) {
 final int x = line + e.rect().top();
 int value = 4 * (maxAlpha - x * maxAlpha / MIRROR_HEIGHT) / (x + 4); // ;
 // std::memset(alphaChannel.scanLine(line), value, alphaChannel.bytesPerLine());
 }
 im.setAlphaChannel(alphaChannel);

QPainter p = new QPainter(this);
 p.drawImage(e.rect(), im);

m_inPaintEvent = false;
 }

public QSize sizeHint(){
 if (m_widget == null) {
 return new QSize();
 }
 QSize s = new QSize(m_widget.sizeHint().width(), m_widget.sizeHint().height());
 s.setHeight(Math.min(s.height(), MIRROR_HEIGHT));
 return s;
 }
 
 public static void main(String args[]) {
 QApplication.initialize(args);
 QCoreApplication.processEvents();
 
 QWidget topLevel = new QWidget();
 QWidget w = new QWidget(topLevel);
 WidgetMirror leMirror = new WidgetMirror(topLevel);
 leMirror.setMirroredWidget(w);
 QPushButton b = new QPushButton(&quot;Button&quot;, w);
 QLineEdit le = new QLineEdit(w);
 QListWidget lw = new QListWidget(w);
 lw.setMaximumHeight(64);
 ArrayList&lt;String&gt; items = new ArrayList&lt;String&gt;();
 items.add(&quot;Item 1&quot;);
 items.add(&quot;Item 2&quot;);
 items.add(&quot;Item 3&quot;);
 items.add(&quot;Item 4&quot;);
 items.add(&quot;Item 5&quot;);
 items.add(&quot;Item 6&quot;);
 items.add(&quot;Item 7&quot;);
 items.add(&quot;Item 8&quot;);
 lw.addItems(items);
 QGridLayout layout = new QGridLayout(w);
 layout.setMargin(0);
 layout.addWidget(b, 0, 0, Qt.AlignmentFlag.AlignBottom);
 layout.addWidget(le, 0, 1, Qt.AlignmentFlag.AlignBottom);
 layout.addWidget(lw, 0, 2, Qt.AlignmentFlag.AlignBottom);
 QVBoxLayout outerLayout = new QVBoxLayout(topLevel);
 outerLayout.setSpacing(0);
 outerLayout.addWidget(w);
 outerLayout.addWidget(leMirror);
 topLevel.show();
 
 QApplication.exec();
 }
}
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