3rdparty/QtPropertyBrowser/src/qtbuttonpropertybrowser.cpp - third_party/nextpnr - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 **
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of a Qt Solutions component.
 **
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "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 Nokia Corporation and its Subsidiary(-ies) 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."
 **
 ****************************************************************************/


 #include "qtbuttonpropertybrowser.h"
 #include <QtCore/QSet>
 #include <QtCore/QTimer>
 #include <QtCore/QMap>
 #include <QGridLayout>
 #include <QLabel>
 #include <QToolButton>
 #include <QStyle>

 #if QT_VERSION >= 0x040400
 QT_BEGIN_NAMESPACE
 #endif

 class QtButtonPropertyBrowserPrivate
 {
     QtButtonPropertyBrowser *q_ptr;
     Q_DECLARE_PUBLIC(QtButtonPropertyBrowser)
 public:

     void init(QWidget *parent);

     void propertyInserted(QtBrowserItem *index, QtBrowserItem *afterIndex);
     void propertyRemoved(QtBrowserItem *index);
     void propertyChanged(QtBrowserItem *index);
     QWidget *createEditor(QtProperty *property, QWidget *parent) const
         { return q_ptr->createEditor(property, parent); }

     void slotEditorDestroyed();
     void slotUpdate();
     void slotToggled(bool checked);

     struct WidgetItem
     {
         WidgetItem() : widget(0), label(0), widgetLabel(0),
                 button(0), container(0), layout(0), /*line(0), */parent(0), expanded(false) { }
         QWidget *widget; // can be null
         QLabel *label; // main label with property name
         QLabel *widgetLabel; // label substitute showing the current value if there is no widget
         QToolButton *button; // expandable button for items with children
         QWidget *container; // container which is expanded when the button is clicked
         QGridLayout *layout; // layout in container
         WidgetItem *parent;
         QList<WidgetItem *> children;
         bool expanded;
     };
 private:
     void updateLater();
     void updateItem(WidgetItem *item);
     void insertRow(QGridLayout *layout, int row) const;
     void removeRow(QGridLayout *layout, int row) const;
     int gridRow(WidgetItem *item) const;
     int gridSpan(WidgetItem *item) const;
     void setExpanded(WidgetItem *item, bool expanded);
     QToolButton *createButton(QWidget *panret = 0) const;

     QMap<QtBrowserItem *, WidgetItem *> m_indexToItem;
     QMap<WidgetItem *, QtBrowserItem *> m_itemToIndex;
     QMap<QWidget *, WidgetItem *> m_widgetToItem;
     QMap<QObject *, WidgetItem *> m_buttonToItem;
     QGridLayout *m_mainLayout;
     QList<WidgetItem *> m_children;
     QList<WidgetItem *> m_recreateQueue;
 };

 QToolButton *QtButtonPropertyBrowserPrivate::createButton(QWidget *parent) const
 {
     QToolButton *button = new QToolButton(parent);
     button->setCheckable(true);
     button->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed));
     button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
     button->setArrowType(Qt::DownArrow);
     button->setIconSize(QSize(3, 16));
     /*
     QIcon icon;
     icon.addPixmap(q_ptr->style()->standardPixmap(QStyle::SP_ArrowDown), QIcon::Normal, QIcon::Off);
     icon.addPixmap(q_ptr->style()->standardPixmap(QStyle::SP_ArrowUp), QIcon::Normal, QIcon::On);
     button->setIcon(icon);
     */
     return button;
 }

 int QtButtonPropertyBrowserPrivate::gridRow(WidgetItem *item) const
 {
     QList<WidgetItem *> siblings;
     if (item->parent)
         siblings = item->parent->children;
     else
         siblings = m_children;

     int row = 0;
     QListIterator<WidgetItem *> it(siblings);
     while (it.hasNext()) {
         WidgetItem *sibling = it.next();
         if (sibling == item)
             return row;
         row += gridSpan(sibling);
     }
     return -1;
 }

 int QtButtonPropertyBrowserPrivate::gridSpan(WidgetItem *item) const
 {
     if (item->container && item->expanded)
         return 2;
     return 1;
 }

 void QtButtonPropertyBrowserPrivate::init(QWidget *parent)
 {
     m_mainLayout = new QGridLayout();
     parent->setLayout(m_mainLayout);
     QLayoutItem *item = new QSpacerItem(0, 0,
                 QSizePolicy::Fixed, QSizePolicy::Expanding);
     m_mainLayout->addItem(item, 0, 0);
 }

 void QtButtonPropertyBrowserPrivate::slotEditorDestroyed()
 {
     QWidget *editor = qobject_cast<QWidget *>(q_ptr->sender());
     if (!editor)
         return;
     if (!m_widgetToItem.contains(editor))
         return;
     m_widgetToItem[editor]->widget = 0;
     m_widgetToItem.remove(editor);
 }

 void QtButtonPropertyBrowserPrivate::slotUpdate()
 {
     QListIterator<WidgetItem *> itItem(m_recreateQueue);
     while (itItem.hasNext()) {
         WidgetItem *item = itItem.next();

         WidgetItem *parent = item->parent;
         QWidget *w = 0;
         QGridLayout *l = 0;
         const int oldRow = gridRow(item);
         if (parent) {
             w = parent->container;
             l = parent->layout;
         } else {
             w = q_ptr;
             l = m_mainLayout;
         }

         int span = 1;
         if (!item->widget && !item->widgetLabel)
             span = 2;
         item->label = new QLabel(w);
         item->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
         l->addWidget(item->label, oldRow, 0, 1, span);

         updateItem(item);
     }
     m_recreateQueue.clear();
 }

 void QtButtonPropertyBrowserPrivate::setExpanded(WidgetItem *item, bool expanded)
 {
     if (item->expanded == expanded)
         return;

     if (!item->container)
         return;

     item->expanded = expanded;
     const int row = gridRow(item);
     WidgetItem *parent = item->parent;
     QGridLayout *l = 0;
     if (parent)
         l = parent->layout;
     else
         l = m_mainLayout;

     if (expanded) {
         insertRow(l, row + 1);
         l->addWidget(item->container, row + 1, 0, 1, 2);
         item->container->show();
     } else {
         l->removeWidget(item->container);
         item->container->hide();
         removeRow(l, row + 1);
     }

     item->button->setChecked(expanded);
     item->button->setArrowType(expanded ? Qt::UpArrow : Qt::DownArrow);
 }

 void QtButtonPropertyBrowserPrivate::slotToggled(bool checked)
 {
     WidgetItem *item = m_buttonToItem.value(q_ptr->sender());
     if (!item)
         return;

     setExpanded(item, checked);

     if (checked)
         emit q_ptr->expanded(m_itemToIndex.value(item));
     else
         emit q_ptr->collapsed(m_itemToIndex.value(item));
 }

 void QtButtonPropertyBrowserPrivate::updateLater()
 {
     QTimer::singleShot(0, q_ptr, SLOT(slotUpdate()));
 }

 void QtButtonPropertyBrowserPrivate::propertyInserted(QtBrowserItem *index, QtBrowserItem *afterIndex)
 {
     WidgetItem *afterItem = m_indexToItem.value(afterIndex);
     WidgetItem *parentItem = m_indexToItem.value(index->parent());

     WidgetItem *newItem = new WidgetItem();
     newItem->parent = parentItem;

     QGridLayout *layout = 0;
     QWidget *parentWidget = 0;
     int row = -1;
     if (!afterItem) {
         row = 0;
         if (parentItem)
             parentItem->children.insert(0, newItem);
         else
             m_children.insert(0, newItem);
     } else {
         row = gridRow(afterItem) + gridSpan(afterItem);
         if (parentItem)
             parentItem->children.insert(parentItem->children.indexOf(afterItem) + 1, newItem);
         else
             m_children.insert(m_children.indexOf(afterItem) + 1, newItem);
     }

     if (!parentItem) {
         layout = m_mainLayout;
         parentWidget = q_ptr;
     } else {
         if (!parentItem->container) {
             m_recreateQueue.removeAll(parentItem);
             WidgetItem *grandParent = parentItem->parent;
             //QWidget *w = 0;
             QGridLayout *l = 0;
             const int oldRow = gridRow(parentItem);
             if (grandParent) {
                 //w = grandParent->container;
                 l = grandParent->layout;
             } else {
                 //w = q_ptr;
                 l = m_mainLayout;
             }
             QFrame *container = new QFrame();
             container->setFrameShape(QFrame::Panel);
             container->setFrameShadow(QFrame::Raised);
             parentItem->container = container;
             parentItem->button = createButton();
             m_buttonToItem[parentItem->button] = parentItem;
             q_ptr->connect(parentItem->button, SIGNAL(toggled(bool)), q_ptr, SLOT(slotToggled(bool)));
             parentItem->layout = new QGridLayout();
             container->setLayout(parentItem->layout);
             if (parentItem->label) {
                 l->removeWidget(parentItem->label);
                 delete parentItem->label;
                 parentItem->label = 0;
             }
             int span = 1;
             if (!parentItem->widget && !parentItem->widgetLabel)
                 span = 2;
             l->addWidget(parentItem->button, oldRow, 0, 1, span);
             updateItem(parentItem);
         }
         layout = parentItem->layout;
         parentWidget = parentItem->container;
     }

     newItem->label = new QLabel(parentWidget);
     newItem->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
     newItem->widget = createEditor(index->property(), parentWidget);
     if (newItem->widget) {
         QObject::connect(newItem->widget, SIGNAL(destroyed()), q_ptr, SLOT(slotEditorDestroyed()));
         m_widgetToItem[newItem->widget] = newItem;
     } else if (index->property()->hasValue()) {
         newItem->widgetLabel = new QLabel(parentWidget);
         newItem->widgetLabel->setSizePolicy(QSizePolicy(QSizePolicy::Ignored, QSizePolicy::Fixed));
     }

     insertRow(layout, row);
     int span = 1;
     if (newItem->widget)
         layout->addWidget(newItem->widget, row, 1);
     else if (newItem->widgetLabel)
         layout->addWidget(newItem->widgetLabel, row, 1);
     else
         span = 2;
     layout->addWidget(newItem->label, row, 0, span, 1);

     m_itemToIndex[newItem] = index;
     m_indexToItem[index] = newItem;

     updateItem(newItem);
 }

 void QtButtonPropertyBrowserPrivate::propertyRemoved(QtBrowserItem *index)
 {
     WidgetItem *item = m_indexToItem.value(index);

     m_indexToItem.remove(index);
     m_itemToIndex.remove(item);

     WidgetItem *parentItem = item->parent;

     const int row = gridRow(item);

     if (parentItem)
         parentItem->children.removeAt(parentItem->children.indexOf(item));
     else
         m_children.removeAt(m_children.indexOf(item));

     const int colSpan = gridSpan(item);

     m_buttonToItem.remove(item->button);

     if (item->widget)
         delete item->widget;
     if (item->label)
         delete item->label;
     if (item->widgetLabel)
         delete item->widgetLabel;
     if (item->button)
         delete item->button;
     if (item->container)
         delete item->container;

     if (!parentItem) {
         removeRow(m_mainLayout, row);
         if (colSpan > 1)
             removeRow(m_mainLayout, row);
     } else if (parentItem->children.count() != 0) {
         removeRow(parentItem->layout, row);
         if (colSpan > 1)
             removeRow(parentItem->layout, row);
     } else {
         const WidgetItem *grandParent = parentItem->parent;
         QGridLayout *l = 0;
         if (grandParent) {
             l = grandParent->layout;
         } else {
             l = m_mainLayout;
         }

         const int parentRow = gridRow(parentItem);
         const int parentSpan = gridSpan(parentItem);

         l->removeWidget(parentItem->button);
         l->removeWidget(parentItem->container);
         delete parentItem->button;
         delete parentItem->container;
         parentItem->button = 0;
         parentItem->container = 0;
         parentItem->layout = 0;
         if (!m_recreateQueue.contains(parentItem))
             m_recreateQueue.append(parentItem);
         if (parentSpan > 1)
             removeRow(l, parentRow + 1);

         updateLater();
     }
     m_recreateQueue.removeAll(item);

     delete item;
 }

 void QtButtonPropertyBrowserPrivate::insertRow(QGridLayout *layout, int row) const
 {
     QMap<QLayoutItem *, QRect> itemToPos;
     int idx = 0;
     while (idx < layout->count()) {
         int r, c, rs, cs;
         layout->getItemPosition(idx, &r, &c, &rs, &cs);
         if (r >= row) {
             itemToPos[layout->takeAt(idx)] = QRect(r + 1, c, rs, cs);
         } else {
             idx++;
         }
     }

     const QMap<QLayoutItem *, QRect>::ConstIterator icend =  itemToPos.constEnd();
     for(QMap<QLayoutItem *, QRect>::ConstIterator it = itemToPos.constBegin(); it != icend; ++it) {
         const QRect r = it.value();
         layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
     }
 }

 void QtButtonPropertyBrowserPrivate::removeRow(QGridLayout *layout, int row) const
 {
     QMap<QLayoutItem *, QRect> itemToPos;
     int idx = 0;
     while (idx < layout->count()) {
         int r, c, rs, cs;
         layout->getItemPosition(idx, &r, &c, &rs, &cs);
         if (r > row) {
             itemToPos[layout->takeAt(idx)] = QRect(r - 1, c, rs, cs);
         } else {
             idx++;
         }
     }

     const QMap<QLayoutItem *, QRect>::ConstIterator icend =  itemToPos.constEnd();
     for(QMap<QLayoutItem *, QRect>::ConstIterator it = itemToPos.constBegin(); it != icend; ++it) {
         const QRect r = it.value();
         layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
     }
 }

 void QtButtonPropertyBrowserPrivate::propertyChanged(QtBrowserItem *index)
 {
     WidgetItem *item = m_indexToItem.value(index);

     updateItem(item);
 }

 void QtButtonPropertyBrowserPrivate::updateItem(WidgetItem *item)
 {
     QtProperty *property = m_itemToIndex[item]->property();
     if (item->button) {
         QFont font = item->button->font();
         font.setUnderline(property->isModified());
         item->button->setFont(font);
         item->button->setText(property->propertyName());
         item->button->setToolTip(property->toolTip());
         item->button->setStatusTip(property->statusTip());
         item->button->setWhatsThis(property->whatsThis());
         item->button->setEnabled(property->isEnabled());
     }
     if (item->label) {
         QFont font = item->label->font();
         font.setUnderline(property->isModified());
         item->label->setFont(font);
         item->label->setText(property->propertyName());
         item->label->setToolTip(property->toolTip());
         item->label->setStatusTip(property->statusTip());
         item->label->setWhatsThis(property->whatsThis());
         item->label->setEnabled(property->isEnabled());
     }
     if (item->widgetLabel) {
         QFont font = item->widgetLabel->font();
         font.setUnderline(false);
         item->widgetLabel->setFont(font);
         item->widgetLabel->setText(property->valueText());
         item->widgetLabel->setToolTip(property->valueText());
         item->widgetLabel->setEnabled(property->isEnabled());
     }
     if (item->widget) {
         QFont font = item->widget->font();
         font.setUnderline(false);
         item->widget->setFont(font);
         item->widget->setEnabled(property->isEnabled());
         item->widget->setToolTip(property->valueText());
     }
 }


 /*!
     \class QtButtonPropertyBrowser

     \brief The QtButtonPropertyBrowser class provides a drop down QToolButton
     based property browser.

     A property browser is a widget that enables the user to edit a
     given set of properties. Each property is represented by a label
     specifying the property's name, and an editing widget (e.g. a line
     edit or a combobox) holding its value. A property can have zero or
     more subproperties.

     QtButtonPropertyBrowser provides drop down button for all nested
     properties, i.e. subproperties are enclosed by a container associated with
     the drop down button. The parent property's name is displayed as button text. For example:

     \image qtbuttonpropertybrowser.png

     Use the QtAbstractPropertyBrowser API to add, insert and remove
     properties from an instance of the QtButtonPropertyBrowser
     class. The properties themselves are created and managed by
     implementations of the QtAbstractPropertyManager class.

     \sa QtTreePropertyBrowser, QtAbstractPropertyBrowser
 */

 /*!
     \fn void QtButtonPropertyBrowser::collapsed(QtBrowserItem *item)

     This signal is emitted when the \a item is collapsed.

     \sa expanded(), setExpanded()
 */

 /*!
     \fn void QtButtonPropertyBrowser::expanded(QtBrowserItem *item)

     This signal is emitted when the \a item is expanded.

     \sa collapsed(), setExpanded()
 */

 /*!
     Creates a property browser with the given \a parent.
 */
 QtButtonPropertyBrowser::QtButtonPropertyBrowser(QWidget *parent)
     : QtAbstractPropertyBrowser(parent)
 {
     d_ptr = new QtButtonPropertyBrowserPrivate;
     d_ptr->q_ptr = this;

     d_ptr->init(this);
 }

 /*!
     Destroys this property browser.

     Note that the properties that were inserted into this browser are
     \e not destroyed since they may still be used in other
     browsers. The properties are owned by the manager that created
     them.

     \sa QtProperty, QtAbstractPropertyManager
 */
 QtButtonPropertyBrowser::~QtButtonPropertyBrowser()
 {
     const QMap<QtButtonPropertyBrowserPrivate::WidgetItem *, QtBrowserItem *>::ConstIterator icend = d_ptr->m_itemToIndex.constEnd();
     for (QMap<QtButtonPropertyBrowserPrivate::WidgetItem *, QtBrowserItem *>::ConstIterator  it =  d_ptr->m_itemToIndex.constBegin(); it != icend; ++it)
         delete it.key();
     delete d_ptr;
 }

 /*!
     \reimp
 */
 void QtButtonPropertyBrowser::itemInserted(QtBrowserItem *item, QtBrowserItem *afterItem)
 {
     d_ptr->propertyInserted(item, afterItem);
 }

 /*!
     \reimp
 */
 void QtButtonPropertyBrowser::itemRemoved(QtBrowserItem *item)
 {
     d_ptr->propertyRemoved(item);
 }

 /*!
     \reimp
 */
 void QtButtonPropertyBrowser::itemChanged(QtBrowserItem *item)
 {
     d_ptr->propertyChanged(item);
 }

 /*!
     Sets the \a item to either collapse or expanded, depending on the value of \a expanded.

     \sa isExpanded(), expanded(), collapsed()
 */

 void QtButtonPropertyBrowser::setExpanded(QtBrowserItem *item, bool expanded)
 {
     QtButtonPropertyBrowserPrivate::WidgetItem *itm = d_ptr->m_indexToItem.value(item);
     if (itm)
         d_ptr->setExpanded(itm, expanded);
 }

 /*!
     Returns true if the \a item is expanded; otherwise returns false.

     \sa setExpanded()
 */

 bool QtButtonPropertyBrowser::isExpanded(QtBrowserItem *item) const
 {
     QtButtonPropertyBrowserPrivate::WidgetItem *itm = d_ptr->m_indexToItem.value(item);
     if (itm)
         return itm->expanded;
     return false;
 }

 #if QT_VERSION >= 0x040400
 QT_END_NAMESPACE
 #endif

 #include "moc_qtbuttonpropertybrowser.cpp"
	/****************************************************************************
	**
	** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
	** All rights reserved.
	**
	** Contact: Nokia Corporation (qt-info@nokia.com)
	**
	** This file is part of a Qt Solutions component.
	**
	** You may use this file under the terms of the BSD license as follows:
	**
	** "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 Nokia Corporation and its Subsidiary(-ies) 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."
	**
	****************************************************************************/


	#include "qtbuttonpropertybrowser.h"
	#include <QtCore/QSet>
	#include <QtCore/QTimer>
	#include <QtCore/QMap>
	#include <QGridLayout>
	#include <QLabel>
	#include <QToolButton>
	#include <QStyle>

	#if QT_VERSION >= 0x040400
	QT_BEGIN_NAMESPACE
	#endif

	class QtButtonPropertyBrowserPrivate
	{
	QtButtonPropertyBrowser *q_ptr;
	Q_DECLARE_PUBLIC(QtButtonPropertyBrowser)
	public:

	void init(QWidget *parent);

	void propertyInserted(QtBrowserItem index, QtBrowserItem afterIndex);
	void propertyRemoved(QtBrowserItem *index);
	void propertyChanged(QtBrowserItem *index);
	QWidget createEditor(QtProperty property, QWidget *parent) const
	{ return q_ptr->createEditor(property, parent); }

	void slotEditorDestroyed();
	void slotUpdate();
	void slotToggled(bool checked);

	struct WidgetItem
	{
	WidgetItem() : widget(0), label(0), widgetLabel(0),
	button(0), container(0), layout(0), /line(0), /parent(0), expanded(false) { }
	QWidget *widget; // can be null
	QLabel *label; // main label with property name
	QLabel *widgetLabel; // label substitute showing the current value if there is no widget
	QToolButton *button; // expandable button for items with children
	QWidget *container; // container which is expanded when the button is clicked
	QGridLayout *layout; // layout in container
	WidgetItem *parent;
	QList<WidgetItem *> children;
	bool expanded;
	};
	private:
	void updateLater();
	void updateItem(WidgetItem *item);
	void insertRow(QGridLayout *layout, int row) const;
	void removeRow(QGridLayout *layout, int row) const;
	int gridRow(WidgetItem *item) const;
	int gridSpan(WidgetItem *item) const;
	void setExpanded(WidgetItem *item, bool expanded);
	QToolButton createButton(QWidget panret = 0) const;

	QMap<QtBrowserItem , WidgetItem > m_indexToItem;
	QMap<WidgetItem , QtBrowserItem > m_itemToIndex;
	QMap<QWidget , WidgetItem > m_widgetToItem;
	QMap<QObject , WidgetItem > m_buttonToItem;
	QGridLayout *m_mainLayout;
	QList<WidgetItem *> m_children;
	QList<WidgetItem *> m_recreateQueue;
	};

	QToolButton QtButtonPropertyBrowserPrivate::createButton(QWidget parent) const
	{
	QToolButton *button = new QToolButton(parent);
	button->setCheckable(true);
	button->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed));
	button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
	button->setArrowType(Qt::DownArrow);
	button->setIconSize(QSize(3, 16));
	/*
	QIcon icon;
	icon.addPixmap(q_ptr->style()->standardPixmap(QStyle::SP_ArrowDown), QIcon::Normal, QIcon::Off);
	icon.addPixmap(q_ptr->style()->standardPixmap(QStyle::SP_ArrowUp), QIcon::Normal, QIcon::On);
	button->setIcon(icon);
	*/
	return button;
	}

	int QtButtonPropertyBrowserPrivate::gridRow(WidgetItem *item) const
	{
	QList<WidgetItem *> siblings;
	if (item->parent)
	siblings = item->parent->children;
	else
	siblings = m_children;

	int row = 0;
	QListIterator<WidgetItem *> it(siblings);
	while (it.hasNext()) {
	WidgetItem *sibling = it.next();
	if (sibling == item)
	return row;
	row += gridSpan(sibling);
	}
	return -1;
	}

	int QtButtonPropertyBrowserPrivate::gridSpan(WidgetItem *item) const
	{
	if (item->container && item->expanded)
	return 2;
	return 1;
	}

	void QtButtonPropertyBrowserPrivate::init(QWidget *parent)
	{
	m_mainLayout = new QGridLayout();
	parent->setLayout(m_mainLayout);
	QLayoutItem *item = new QSpacerItem(0, 0,
	QSizePolicy::Fixed, QSizePolicy::Expanding);
	m_mainLayout->addItem(item, 0, 0);
	}

	void QtButtonPropertyBrowserPrivate::slotEditorDestroyed()
	{
	QWidget editor = qobject_cast<QWidget >(q_ptr->sender());
	if (!editor)
	return;
	if (!m_widgetToItem.contains(editor))
	return;
	m_widgetToItem[editor]->widget = 0;
	m_widgetToItem.remove(editor);
	}

	void QtButtonPropertyBrowserPrivate::slotUpdate()
	{
	QListIterator<WidgetItem *> itItem(m_recreateQueue);
	while (itItem.hasNext()) {
	WidgetItem *item = itItem.next();

	WidgetItem *parent = item->parent;
	QWidget *w = 0;
	QGridLayout *l = 0;
	const int oldRow = gridRow(item);
	if (parent) {
	w = parent->container;
	l = parent->layout;
	} else {
	w = q_ptr;
	l = m_mainLayout;
	}

	int span = 1;
	if (!item->widget && !item->widgetLabel)
	span = 2;
	item->label = new QLabel(w);
	item->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
	l->addWidget(item->label, oldRow, 0, 1, span);

	updateItem(item);
	}
	m_recreateQueue.clear();
	}

	void QtButtonPropertyBrowserPrivate::setExpanded(WidgetItem *item, bool expanded)
	{
	if (item->expanded == expanded)
	return;

	if (!item->container)
	return;

	item->expanded = expanded;
	const int row = gridRow(item);
	WidgetItem *parent = item->parent;
	QGridLayout *l = 0;
	if (parent)
	l = parent->layout;
	else
	l = m_mainLayout;

	if (expanded) {
	insertRow(l, row + 1);
	l->addWidget(item->container, row + 1, 0, 1, 2);
	item->container->show();
	} else {
	l->removeWidget(item->container);
	item->container->hide();
	removeRow(l, row + 1);
	}

	item->button->setChecked(expanded);
	item->button->setArrowType(expanded ? Qt::UpArrow : Qt::DownArrow);
	}

	void QtButtonPropertyBrowserPrivate::slotToggled(bool checked)
	{
	WidgetItem *item = m_buttonToItem.value(q_ptr->sender());
	if (!item)
	return;

	setExpanded(item, checked);

	if (checked)
	emit q_ptr->expanded(m_itemToIndex.value(item));
	else
	emit q_ptr->collapsed(m_itemToIndex.value(item));
	}

	void QtButtonPropertyBrowserPrivate::updateLater()
	{
	QTimer::singleShot(0, q_ptr, SLOT(slotUpdate()));
	}

	void QtButtonPropertyBrowserPrivate::propertyInserted(QtBrowserItem index, QtBrowserItem afterIndex)
	{
	WidgetItem *afterItem = m_indexToItem.value(afterIndex);
	WidgetItem *parentItem = m_indexToItem.value(index->parent());

	WidgetItem *newItem = new WidgetItem();
	newItem->parent = parentItem;

	QGridLayout *layout = 0;
	QWidget *parentWidget = 0;
	int row = -1;
	if (!afterItem) {
	row = 0;
	if (parentItem)
	parentItem->children.insert(0, newItem);
	else
	m_children.insert(0, newItem);
	} else {
	row = gridRow(afterItem) + gridSpan(afterItem);
	if (parentItem)
	parentItem->children.insert(parentItem->children.indexOf(afterItem) + 1, newItem);
	else
	m_children.insert(m_children.indexOf(afterItem) + 1, newItem);
	}

	if (!parentItem) {
	layout = m_mainLayout;
	parentWidget = q_ptr;
	} else {
	if (!parentItem->container) {
	m_recreateQueue.removeAll(parentItem);
	WidgetItem *grandParent = parentItem->parent;
	//QWidget *w = 0;
	QGridLayout *l = 0;
	const int oldRow = gridRow(parentItem);
	if (grandParent) {
	//w = grandParent->container;
	l = grandParent->layout;
	} else {
	//w = q_ptr;
	l = m_mainLayout;
	}
	QFrame *container = new QFrame();
	container->setFrameShape(QFrame::Panel);
	container->setFrameShadow(QFrame::Raised);
	parentItem->container = container;
	parentItem->button = createButton();
	m_buttonToItem[parentItem->button] = parentItem;
	q_ptr->connect(parentItem->button, SIGNAL(toggled(bool)), q_ptr, SLOT(slotToggled(bool)));
	parentItem->layout = new QGridLayout();
	container->setLayout(parentItem->layout);
	if (parentItem->label) {
	l->removeWidget(parentItem->label);
	delete parentItem->label;
	parentItem->label = 0;
	}
	int span = 1;
	if (!parentItem->widget && !parentItem->widgetLabel)
	span = 2;
	l->addWidget(parentItem->button, oldRow, 0, 1, span);
	updateItem(parentItem);
	}
	layout = parentItem->layout;
	parentWidget = parentItem->container;
	}

	newItem->label = new QLabel(parentWidget);
	newItem->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
	newItem->widget = createEditor(index->property(), parentWidget);
	if (newItem->widget) {
	QObject::connect(newItem->widget, SIGNAL(destroyed()), q_ptr, SLOT(slotEditorDestroyed()));
	m_widgetToItem[newItem->widget] = newItem;
	} else if (index->property()->hasValue()) {
	newItem->widgetLabel = new QLabel(parentWidget);
	newItem->widgetLabel->setSizePolicy(QSizePolicy(QSizePolicy::Ignored, QSizePolicy::Fixed));
	}

	insertRow(layout, row);
	int span = 1;
	if (newItem->widget)
	layout->addWidget(newItem->widget, row, 1);
	else if (newItem->widgetLabel)
	layout->addWidget(newItem->widgetLabel, row, 1);
	else
	span = 2;
	layout->addWidget(newItem->label, row, 0, span, 1);

	m_itemToIndex[newItem] = index;
	m_indexToItem[index] = newItem;

	updateItem(newItem);
	}

	void QtButtonPropertyBrowserPrivate::propertyRemoved(QtBrowserItem *index)
	{
	WidgetItem *item = m_indexToItem.value(index);

	m_indexToItem.remove(index);
	m_itemToIndex.remove(item);

	WidgetItem *parentItem = item->parent;

	const int row = gridRow(item);

	if (parentItem)
	parentItem->children.removeAt(parentItem->children.indexOf(item));
	else
	m_children.removeAt(m_children.indexOf(item));

	const int colSpan = gridSpan(item);

	m_buttonToItem.remove(item->button);

	if (item->widget)
	delete item->widget;
	if (item->label)
	delete item->label;
	if (item->widgetLabel)
	delete item->widgetLabel;
	if (item->button)
	delete item->button;
	if (item->container)
	delete item->container;

	if (!parentItem) {
	removeRow(m_mainLayout, row);
	if (colSpan > 1)
	removeRow(m_mainLayout, row);
	} else if (parentItem->children.count() != 0) {
	removeRow(parentItem->layout, row);
	if (colSpan > 1)
	removeRow(parentItem->layout, row);
	} else {
	const WidgetItem *grandParent = parentItem->parent;
	QGridLayout *l = 0;
	if (grandParent) {
	l = grandParent->layout;
	} else {
	l = m_mainLayout;
	}

	const int parentRow = gridRow(parentItem);
	const int parentSpan = gridSpan(parentItem);

	l->removeWidget(parentItem->button);
	l->removeWidget(parentItem->container);
	delete parentItem->button;
	delete parentItem->container;
	parentItem->button = 0;
	parentItem->container = 0;
	parentItem->layout = 0;
	if (!m_recreateQueue.contains(parentItem))
	m_recreateQueue.append(parentItem);
	if (parentSpan > 1)
	removeRow(l, parentRow + 1);

	updateLater();
	}
	m_recreateQueue.removeAll(item);

	delete item;
	}

	void QtButtonPropertyBrowserPrivate::insertRow(QGridLayout *layout, int row) const
	{
	QMap<QLayoutItem *, QRect> itemToPos;
	int idx = 0;
	while (idx < layout->count()) {
	int r, c, rs, cs;
	layout->getItemPosition(idx, &r, &c, &rs, &cs);
	if (r >= row) {
	itemToPos[layout->takeAt(idx)] = QRect(r + 1, c, rs, cs);
	} else {
	idx++;
	}
	}

	const QMap<QLayoutItem *, QRect>::ConstIterator icend = itemToPos.constEnd();
	for(QMap<QLayoutItem *, QRect>::ConstIterator it = itemToPos.constBegin(); it != icend; ++it) {
	const QRect r = it.value();
	layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
	}
	}

	void QtButtonPropertyBrowserPrivate::removeRow(QGridLayout *layout, int row) const
	{
	QMap<QLayoutItem *, QRect> itemToPos;
	int idx = 0;
	while (idx < layout->count()) {
	int r, c, rs, cs;
	layout->getItemPosition(idx, &r, &c, &rs, &cs);
	if (r > row) {
	itemToPos[layout->takeAt(idx)] = QRect(r - 1, c, rs, cs);
	} else {
	idx++;
	}
	}

	const QMap<QLayoutItem *, QRect>::ConstIterator icend = itemToPos.constEnd();
	for(QMap<QLayoutItem *, QRect>::ConstIterator it = itemToPos.constBegin(); it != icend; ++it) {
	const QRect r = it.value();
	layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
	}
	}

	void QtButtonPropertyBrowserPrivate::propertyChanged(QtBrowserItem *index)
	{
	WidgetItem *item = m_indexToItem.value(index);

	updateItem(item);
	}

	void QtButtonPropertyBrowserPrivate::updateItem(WidgetItem *item)
	{
	QtProperty *property = m_itemToIndex[item]->property();
	if (item->button) {
	QFont font = item->button->font();
	font.setUnderline(property->isModified());
	item->button->setFont(font);
	item->button->setText(property->propertyName());
	item->button->setToolTip(property->toolTip());
	item->button->setStatusTip(property->statusTip());
	item->button->setWhatsThis(property->whatsThis());
	item->button->setEnabled(property->isEnabled());
	}
	if (item->label) {
	QFont font = item->label->font();
	font.setUnderline(property->isModified());
	item->label->setFont(font);
	item->label->setText(property->propertyName());
	item->label->setToolTip(property->toolTip());
	item->label->setStatusTip(property->statusTip());
	item->label->setWhatsThis(property->whatsThis());
	item->label->setEnabled(property->isEnabled());
	}
	if (item->widgetLabel) {
	QFont font = item->widgetLabel->font();
	font.setUnderline(false);
	item->widgetLabel->setFont(font);
	item->widgetLabel->setText(property->valueText());
	item->widgetLabel->setToolTip(property->valueText());
	item->widgetLabel->setEnabled(property->isEnabled());
	}
	if (item->widget) {
	QFont font = item->widget->font();
	font.setUnderline(false);
	item->widget->setFont(font);
	item->widget->setEnabled(property->isEnabled());
	item->widget->setToolTip(property->valueText());
	}
	}



	/*!
	\class QtButtonPropertyBrowser

	\brief The QtButtonPropertyBrowser class provides a drop down QToolButton
	based property browser.

	A property browser is a widget that enables the user to edit a
	given set of properties. Each property is represented by a label
	specifying the property's name, and an editing widget (e.g. a line
	edit or a combobox) holding its value. A property can have zero or
	more subproperties.

	QtButtonPropertyBrowser provides drop down button for all nested
	properties, i.e. subproperties are enclosed by a container associated with
	the drop down button. The parent property's name is displayed as button text. For example:

	\image qtbuttonpropertybrowser.png

	Use the QtAbstractPropertyBrowser API to add, insert and remove
	properties from an instance of the QtButtonPropertyBrowser
	class. The properties themselves are created and managed by
	implementations of the QtAbstractPropertyManager class.

	\sa QtTreePropertyBrowser, QtAbstractPropertyBrowser
	*/

	/*!
	\fn void QtButtonPropertyBrowser::collapsed(QtBrowserItem *item)

	This signal is emitted when the \a item is collapsed.

	\sa expanded(), setExpanded()
	*/

	/*!
	\fn void QtButtonPropertyBrowser::expanded(QtBrowserItem *item)

	This signal is emitted when the \a item is expanded.

	\sa collapsed(), setExpanded()
	*/

	/*!
	Creates a property browser with the given \a parent.
	*/
	QtButtonPropertyBrowser::QtButtonPropertyBrowser(QWidget *parent)
	: QtAbstractPropertyBrowser(parent)
	{
	d_ptr = new QtButtonPropertyBrowserPrivate;
	d_ptr->q_ptr = this;

	d_ptr->init(this);
	}

	/*!
	Destroys this property browser.

	Note that the properties that were inserted into this browser are
	\e not destroyed since they may still be used in other
	browsers. The properties are owned by the manager that created
	them.

	\sa QtProperty, QtAbstractPropertyManager
	*/
	QtButtonPropertyBrowser::~QtButtonPropertyBrowser()
	{
	const QMap<QtButtonPropertyBrowserPrivate::WidgetItem , QtBrowserItem >::ConstIterator icend = d_ptr->m_itemToIndex.constEnd();
	for (QMap<QtButtonPropertyBrowserPrivate::WidgetItem , QtBrowserItem >::ConstIterator it = d_ptr->m_itemToIndex.constBegin(); it != icend; ++it)
	delete it.key();
	delete d_ptr;
	}

	/*!
	\reimp
	*/
	void QtButtonPropertyBrowser::itemInserted(QtBrowserItem item, QtBrowserItem afterItem)
	{
	d_ptr->propertyInserted(item, afterItem);
	}

	/*!
	\reimp
	*/
	void QtButtonPropertyBrowser::itemRemoved(QtBrowserItem *item)
	{
	d_ptr->propertyRemoved(item);
	}

	/*!
	\reimp
	*/
	void QtButtonPropertyBrowser::itemChanged(QtBrowserItem *item)
	{
	d_ptr->propertyChanged(item);
	}

	/*!
	Sets the \a item to either collapse or expanded, depending on the value of \a expanded.

	\sa isExpanded(), expanded(), collapsed()
	*/

	void QtButtonPropertyBrowser::setExpanded(QtBrowserItem *item, bool expanded)
	{
	QtButtonPropertyBrowserPrivate::WidgetItem *itm = d_ptr->m_indexToItem.value(item);
	if (itm)
	d_ptr->setExpanded(itm, expanded);
	}

	/*!
	Returns true if the \a item is expanded; otherwise returns false.

	\sa setExpanded()
	*/

	bool QtButtonPropertyBrowser::isExpanded(QtBrowserItem *item) const
	{
	QtButtonPropertyBrowserPrivate::WidgetItem *itm = d_ptr->m_indexToItem.value(item);
	if (itm)
	return itm->expanded;
	return false;
	}

	#if QT_VERSION >= 0x040400
	QT_END_NAMESPACE
	#endif

	#include "moc_qtbuttonpropertybrowser.cpp"