configurationdialog.cpp

//------------------------------------------------------------------------------
// configurationdialog.cpp
//------------------------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or
// modify it under the 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., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301  USA
//
//------------------------------------------------------------------------------
// Copyright (C) 2009 "Zalewa" <zalewapl@gmail.com>
//------------------------------------------------------------------------------
#include "configurationdialog.h"
#include "ui_configurationdialog.h"

#include "configpage.h"
#include "qtmetapointer.h"
#include <cassert>
#include <QAbstractButton>
#include <QDebug>
#include <QKeyEvent>
#include <QStandardItem>
#include <QStandardItemModel>
#include <Qt>
#include <QTreeView>

DClass<ConfigurationDialog> : public Ui::ConfigurationDialog
{
public:
        enum Column
        {
                COL_FIRST = 0,
                COL_META = 0,
                COL_NAME = 0,
                COL_VALIDATION = 1,
                COLSIZE,
        };

        QList<ConfigPage *> configPages;
        ConfigPage *currentlyDisplayedPage;

        QModelIndex findPageModelIndex(const QModelIndex &rootIndex, ConfigPage *page)
        {
                auto model = static_cast<QStandardItemModel *>(tvOptionsList->model());
                for (int row = 0; row < model->rowCount(rootIndex); ++row)
                {
                        QModelIndex index = model->index(row, COL_META, rootIndex);
                        ConfigPage *pageAtIndex = pageFromIndex(index);
                        if (pageAtIndex == page)
                                return index;
                        QModelIndex childIndex = findPageModelIndex(index, page);
                        if (childIndex.isValid())
                                return childIndex;
                }
                return QModelIndex();
        }

        ConfigPage *pageFromIndex(const QModelIndex &index)
        {
                QModelIndex pageIndex = index.sibling(index.row(), COL_META);
                QtMetaPointer metaPointer = pageIndex.data(Qt::UserRole).value<QtMetaPointer>();
                void *pointer = metaPointer;
                return static_cast<ConfigPage *>(pointer);
        }

        QIcon validationIcon(ConfigPage::Validation validation) const
        {
                switch (validation)
                {
                case ConfigPage::VALIDATION_ERROR:
                        return QIcon(":icons/exclamation_16.png");
                default:
                        return QIcon();
                }
        }
};

DPointered(ConfigurationDialog)

ConfigurationDialog::ConfigurationDialog(QWidget *parent)
        : QDialog(parent)
{
        d->setupUi(this);

        auto model = new QStandardItemModel(this);
        for (int column = PrivData<ConfigurationDialog>::COL_FIRST;
                column < PrivData<ConfigurationDialog>::COLSIZE; ++column)
        {
                model->setHorizontalHeaderItem(column, new QStandardItem());
        }
        d->tvOptionsList->setModel(model);

        d->tvOptionsList->header()->setSectionResizeMode(
                PrivData<ConfigurationDialog>::COL_NAME, QHeaderView::Stretch);
        d->tvOptionsList->header()->setSectionResizeMode(
                PrivData<ConfigurationDialog>::COL_VALIDATION, QHeaderView::Fixed);

        d->currentlyDisplayedPage = nullptr;
        connect(d->buttonBox, SIGNAL(clicked(QAbstractButton*)), this, SLOT (btnClicked(QAbstractButton*)));
        this->connect(d->tvOptionsList->selectionModel(), SIGNAL(currentChanged(QModelIndex,QModelIndex)),
                SLOT(switchToItem(QModelIndex,QModelIndex)));
}

ConfigurationDialog::~ConfigurationDialog()
{
        for (int i = 0; i < d->configPages.count(); ++i)
                delete d->configPages[i];
}

QStandardItem *ConfigurationDialog::addConfigPage(
        QStandardItem *rootItem, ConfigPage *configPage, int position)
{
        if (!canConfigPageBeAdded(configPage))
                return nullptr;

        auto pModel = (QStandardItemModel *)d->tvOptionsList->model();
        if (rootItem == nullptr)
                rootItem = pModel->invisibleRootItem();

        if (!this->hasItemOnList(rootItem))
                return nullptr;

        QList<QStandardItem *> row;

        QStandardItem *nameItem = new QStandardItem(configPage->name());
        nameItem->setIcon(configPage->icon());

        row.insert(PrivData<ConfigurationDialog>::COL_NAME, nameItem);

        QtMetaPointer metaPointer = configPage;
        nameItem->setData(QVariant::fromValue(metaPointer), Qt::UserRole);

        row.insert(PrivData<ConfigurationDialog>::COL_VALIDATION, new QStandardItem());

        if (position < 0)
                rootItem->appendRow(row);
        else
                rootItem->insertRow(position, row);

        d->configPages << configPage;
        this->connect(configPage, SIGNAL(validationRequested()),
                SLOT(onPageValidationRequested()));

        if (!configPage->areSettingsAlreadyRead())
                configPage->read();
        validatePage(configPage);

        return nameItem;
}

QStandardItem *ConfigurationDialog::addLabel(QStandardItem *rootItem, const QString &label, int position)
{
        auto pModel = (QStandardItemModel *)d->tvOptionsList->model();
        if (rootItem == nullptr)
                rootItem = pModel->invisibleRootItem();

        if (!this->hasItemOnList(rootItem))
                return nullptr;

        QtMetaPointer metaPointer = (void *)nullptr;
        QVariant variantMetaPointer = QVariant::fromValue(metaPointer);

        QList<QStandardItem *> row;

        auto nameItem = new QStandardItem(label);
        nameItem->setData(variantMetaPointer, Qt::UserRole);
        row.insert(PrivData<ConfigurationDialog>::COL_NAME, nameItem);
        row.insert(PrivData<ConfigurationDialog>::COL_VALIDATION, new QStandardItem());

        if (position < 0)
                rootItem->appendRow(row);
        else
                rootItem->insertRow(position, row);

        return nameItem;
}

void ConfigurationDialog::btnClicked(QAbstractButton *button)
{
        // Figure out what button we pressed and perform its action.
        switch (d->buttonBox->standardButton(button))
        {
        default:
                break;

        case QDialogButtonBox::Ok: // Also does the same as Apply
                if (this->validate())
                {
                        this->accept();
                        this->saveSettings();
                }
                break;

        case QDialogButtonBox::Apply:
                if (this->validate())
                        this->saveSettings();
                break;

        case QDialogButtonBox::Cancel:
                this->reject();
                break;
        }
}

bool ConfigurationDialog::canConfigPageBeAdded(ConfigPage *configPage)
{
        return isConfigPageValid(configPage) && !hasConfigPage(configPage);
}

QModelIndex ConfigurationDialog::findPageModelIndex(ConfigPage *page)
{
        auto model = static_cast<QStandardItemModel *>(d->tvOptionsList->model());
        return d->findPageModelIndex(model->indexFromItem(model->invisibleRootItem()), page);
}

bool ConfigurationDialog::isConfigPageValid(ConfigPage *configPage)
{
        return configPage != nullptr && !configPage->name().isEmpty();
}

bool ConfigurationDialog::hasConfigPage(ConfigPage *configPage)
{
        for (ConfigPage *addedPage : d->configPages)
        {
                if (configPage == addedPage)
                        return true;
        }

        return false;
}

void ConfigurationDialog::keyPressEvent(QKeyEvent *e)
{
        switch (e->key())
        {
        case Qt::Key_Enter:
        case Qt::Key_Return:
                // Suppress the dialog being accepted on pressing ENTER key.
                // Dialog would close even in line edits that had "returnPressed()"
                // signals connected. That wasn't good.
                e->ignore();
                break;
        default:
                QDialog::keyPressEvent(e);
        }
}

bool ConfigurationDialog::hasItemOnList(QStandardItem *pItem) const
{
        if (pItem == nullptr)
                return false;

        auto pModel = (QStandardItemModel *)d->tvOptionsList->model();

        // Calling index methods on the invisible root items will always return
        // invalid values.

        return pModel->invisibleRootItem() == pItem
                || pModel->indexFromItem(pItem).isValid();
}

void ConfigurationDialog::onPageValidationRequested()
{
        auto page = qobject_cast<ConfigPage *>(sender());
        assert(page != nullptr);
        validatePage(page);
}

void ConfigurationDialog::reject()
{
        for (ConfigPage *page : d->configPages)
        {
                page->reject();
        }
        QDialog::reject();
}

void ConfigurationDialog::switchToItem(const QModelIndex &current, const QModelIndex &previous)
{
        if (current.isValid() && current != previous)
        {
                ConfigPage *configPage = d->pageFromIndex(current);

                // Something with sense was selected, display this something
                // and hide previous box.
                if (isConfigPageValid(configPage))
                        showConfigPage(configPage);
        }
}

QTreeView *ConfigurationDialog::optionsTree()
{
        return d->tvOptionsList;
}

void ConfigurationDialog::saveSettings()
{
        // Iterate through every engine and execute it's saving method
        for (int i = 0; i < d->configPages.count(); ++i)
                d->configPages[i]->save();

        doSaveSettings();

        if (isVisible())
        {
                // Allow panels such as the one for Wadseeker update their contents.
                for (int i = 0; i < d->configPages.count(); ++i)
                {
                        d->configPages[i]->read();
                        validatePage(d->configPages[i]);
                }
        }
}

void ConfigurationDialog::showConfigPage(ConfigPage *page)
{
        if (d->currentlyDisplayedPage != nullptr)
        {
                validatePage(d->currentlyDisplayedPage);
                d->currentlyDisplayedPage->hide();
                d->mainPanel->setTitle(QString());
        }
        d->currentlyDisplayedPage = page;

        if (page != nullptr)
        {
                page->setAllowSave(true);
                validatePage(page);
                d->mainPanel->layout()->addWidget(page);
                d->mainPanel->setTitle(page->title());
                page->show();
        }
}

void ConfigurationDialog::validatePage(ConfigPage *page)
{
        assert(page != nullptr);
        QModelIndex pageIndex = findPageModelIndex(page);
        assert(pageIndex.isValid());

        QModelIndex validationIndex = pageIndex.sibling(pageIndex.row(), PrivData<ConfigurationDialog>::COL_VALIDATION);
        assert(validationIndex.isValid());

        auto model = static_cast<QStandardItemModel *>(d->tvOptionsList->model());
        QStandardItem *validationItem = model->itemFromIndex(validationIndex);
        validationItem->setIcon(d->validationIcon(page->validate()));
}