settingstree.cpp Example File
tools/settingseditor/settingstree.cpp
/****************************************************************************
**
** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
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** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <QtGui>
#include "settingstree.h"
#include "variantdelegate.h"
SettingsTree::SettingsTree(QWidget *parent)
: QTreeWidget(parent)
{
setItemDelegate(new VariantDelegate(this));
QStringList labels;
labels << tr("Setting") << tr("Type") << tr("Value");
setHeaderLabels(labels);
header()->setResizeMode(0, QHeaderView::Stretch);
header()->setResizeMode(2, QHeaderView::Stretch);
settings = 0;
refreshTimer.setInterval(2000);
autoRefresh = false;
groupIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirClosedIcon),
QIcon::Normal, QIcon::Off);
groupIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirOpenIcon),
QIcon::Normal, QIcon::On);
keyIcon.addPixmap(style()->standardPixmap(QStyle::SP_FileIcon));
connect(&refreshTimer, SIGNAL(timeout()), this, SLOT(maybeRefresh()));
}
void SettingsTree::setSettingsObject(QSettings *settings)
{
delete this->settings;
this->settings = settings;
clear();
if (settings) {
settings->setParent(this);
refresh();
if (autoRefresh)
refreshTimer.start();
} else {
refreshTimer.stop();
}
}
QSize SettingsTree::sizeHint() const
{
return QSize(800, 600);
}
void SettingsTree::setAutoRefresh(bool autoRefresh)
{
this->autoRefresh = autoRefresh;
if (settings) {
if (autoRefresh) {
maybeRefresh();
refreshTimer.start();
} else {
refreshTimer.stop();
}
}
}
void SettingsTree::setFallbacksEnabled(bool enabled)
{
if (settings) {
settings->setFallbacksEnabled(enabled);
refresh();
}
}
void SettingsTree::maybeRefresh()
{
if (state() != EditingState)
refresh();
}
void SettingsTree::refresh()
{
if (!settings)
return;
disconnect(this, SIGNAL(itemChanged(QTreeWidgetItem *, int)),
this, SLOT(updateSetting(QTreeWidgetItem *)));
settings->sync();
updateChildItems(0);
connect(this, SIGNAL(itemChanged(QTreeWidgetItem *, int)),
this, SLOT(updateSetting(QTreeWidgetItem *)));
}
bool SettingsTree::event(QEvent *event)
{
if (event->type() == QEvent::WindowActivate) {
if (isActiveWindow() && autoRefresh)
maybeRefresh();
}
return QTreeWidget::event(event);
}
void SettingsTree::updateSetting(QTreeWidgetItem *item)
{
QString key = item->text(0);
QTreeWidgetItem *ancestor = item->parent();
while (ancestor) {
key.prepend(ancestor->text(0) + "/");
ancestor = ancestor->parent();
}
settings->setValue(key, item->data(2, Qt::UserRole));
if (autoRefresh)
refresh();
}
void SettingsTree::updateChildItems(QTreeWidgetItem *parent)
{
int dividerIndex = 0;
foreach (QString group, settings->childGroups()) {
QTreeWidgetItem *child;
int childIndex = findChild(parent, group, dividerIndex);
if (childIndex != -1) {
child = childAt(parent, childIndex);
child->setText(1, "");
child->setText(2, "");
child->setData(2, Qt::UserRole, QVariant());
moveItemForward(parent, childIndex, dividerIndex);
} else {
child = createItem(group, parent, dividerIndex);
}
child->setIcon(0, groupIcon);
++dividerIndex;
settings->beginGroup(group);
updateChildItems(child);
settings->endGroup();
}
foreach (QString key, settings->childKeys()) {
QTreeWidgetItem *child;
int childIndex = findChild(parent, key, 0);
if (childIndex == -1 || childIndex >= dividerIndex) {
if (childIndex != -1) {
child = childAt(parent, childIndex);
for (int i = 0; i < child->childCount(); ++i)
delete childAt(child, i);
moveItemForward(parent, childIndex, dividerIndex);
} else {
child = createItem(key, parent, dividerIndex);
}
child->setIcon(0, keyIcon);
++dividerIndex;
} else {
child = childAt(parent, childIndex);
}
QVariant value = settings->value(key);
if (value.type() == QVariant::Invalid) {
child->setText(1, "Invalid");
} else {
child->setText(1, value.typeName());
}
child->setText(2, VariantDelegate::displayText(value));
child->setData(2, Qt::UserRole, value);
}
while (dividerIndex < childCount(parent))
delete childAt(parent, dividerIndex);
}
QTreeWidgetItem *SettingsTree::createItem(const QString &text,
QTreeWidgetItem *parent, int index)
{
QTreeWidgetItem *after = 0;
if (index != 0)
after = childAt(parent, index - 1);
QTreeWidgetItem *item;
if (parent)
item = new QTreeWidgetItem(parent, after);
else
item = new QTreeWidgetItem(this, after);
item->setText(0, text);
item->setFlags(item->flags() | Qt::ItemIsEditable);
return item;
}
QTreeWidgetItem *SettingsTree::childAt(QTreeWidgetItem *parent, int index)
{
if (parent)
return parent->child(index);
else
return topLevelItem(index);
}
int SettingsTree::childCount(QTreeWidgetItem *parent)
{
if (parent)
return parent->childCount();
else
return topLevelItemCount();
}
int SettingsTree::findChild(QTreeWidgetItem *parent, const QString &text,
int startIndex)
{
for (int i = startIndex; i < childCount(parent); ++i) {
if (childAt(parent, i)->text(0) == text)
return i;
}
return -1;
}
void SettingsTree::moveItemForward(QTreeWidgetItem *parent, int oldIndex,
int newIndex)
{
for (int i = 0; i < oldIndex - newIndex; ++i)
delete childAt(parent, newIndex);
}
