main.cpp

奇趣公司比较新的qt/emd版本

/****************************************************************************
**
** Copyright (C) 2004-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the demonstration applications 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://trolltech.com/products/qt/licenses/licensing/opensource/
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at [e-mail].
**
** In addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.0, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** In addition, as a special exception, Trolltech, as the sole copyright
** holder for Qt Designer, grants users of the Qt/Eclipse Integration
** plug-in the right for the Qt/Eclipse Integration to link to
** functionality provided by Qt Designer and its related libraries.
**
** Trolltech reserves all rights not expressly granted herein.
**
** 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>

static QString encode_pos(int row, int col) {
    return QString(col + 'A') + QString::number(row + 1);
}

static void decode_pos(const QString &pos, int *row, int *col)
{
    if (pos.isEmpty()) {
        *col = -1;
        *row = -1;
    } else {
        *col = pos.at(0).toLatin1() - 'A';
        *row = pos.right(pos.size() - 1).toInt() - 1;
    }
}

class SpreadSheetDelegate : public QItemDelegate
{
    Q_OBJECT
public:
    SpreadSheetDelegate(QObject *parent = 0);
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &,
        const QModelIndex &index) const;
    void setEditorData(QWidget *editor, const QModelIndex &index) const;
    void setModelData(QWidget *editor, QAbstractItemModel *model,
        const QModelIndex &index) const;
private slots:
    void commitAndCloseEditor();
};

SpreadSheetDelegate::SpreadSheetDelegate(QObject *parent)
    : QItemDelegate(parent) {}

QWidget *SpreadSheetDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem&,
    const QModelIndex &index) const
{
    if(index.column() == 1){
        QDateTimeEdit *editor = new QDateTimeEdit(parent);
        editor->setDisplayFormat("dd/M/yyyy");
        editor->setCalendarPopup(true);
        return editor;
    }
    QLineEdit *editor = new QLineEdit(parent);
    //create a completer with the strings in the column as model.
    QStringList allStrings;
    for(int i = 1; i<index.model()->rowCount(); i++){
        QString strItem(index.model()->data(index.sibling(i, index.column()), Qt::EditRole).toString());
        if(!allStrings.contains(strItem))
            allStrings.append(strItem);
    }
    QCompleter *autoComplete = new QCompleter(allStrings);
    editor->setCompleter(autoComplete);
    connect(editor, SIGNAL(editingFinished()), this, SLOT(commitAndCloseEditor()));
    return editor;
}

void SpreadSheetDelegate::commitAndCloseEditor()
{
    QLineEdit *editor = qobject_cast<QLineEdit *>(sender());
    emit commitData(editor);
    emit closeEditor(editor);
}

void SpreadSheetDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
    QLineEdit *edit = qobject_cast<QLineEdit *>(editor);
    if (edit) {
        edit->setText(index.model()->data(index, Qt::EditRole).toString());
    }
    else {
        QDateTimeEdit *dateEditor = qobject_cast<QDateTimeEdit *>(editor);
        if (dateEditor) {
            dateEditor->setDate(QDate::fromString(index.model()->data(index, Qt::EditRole).toString(), "d/M/yyyy"));
        }
    }
}

void SpreadSheetDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
    const QModelIndex &index) const
{
    QLineEdit *edit = qobject_cast<QLineEdit *>(editor);
    if (edit) {
        model->setData(index, edit->text());
    }
    else {
        QDateTimeEdit *dateEditor = qobject_cast<QDateTimeEdit *>(editor);
        if (dateEditor) {
            model->setData(index, dateEditor->date().toString("dd/M/yyyy"));
        }
    }
}

class SpreadSheetItem : public QTableWidgetItem
{
public:
    SpreadSheetItem();
    SpreadSheetItem(const QString &text);

    QTableWidgetItem *clone() const;

    QVariant data(int role) const;
    void setData(int role, const QVariant &value);
    QVariant display() const;

    inline QString formula() const
        { return QTableWidgetItem::data(Qt::DisplayRole).toString(); }

    static QVariant computeFormula(const QString &formula,
                                   const QTableWidget *widget,
                                   const QTableWidgetItem *self = 0);

private:
    mutable bool isResolving;
};

SpreadSheetItem::SpreadSheetItem()
    : QTableWidgetItem(), isResolving(false) {}

SpreadSheetItem::SpreadSheetItem(const QString &text)
    : QTableWidgetItem(text), isResolving(false) {}

QTableWidgetItem *SpreadSheetItem::clone() const
{
    SpreadSheetItem *item = new SpreadSheetItem();
    *item = *this;
    return item;
}

QVariant SpreadSheetItem::data(int role) const
{
    if (role == Qt::EditRole || role == Qt::StatusTipRole)
        return formula();

    if (role == Qt::DisplayRole)
        return display();

    QString t = display().toString();
    bool isNumber = false;
    int number = t.toInt(&isNumber);

    if (role == Qt::TextColorRole) {
        if (!isNumber)
            return qVariantFromValue(QColor(Qt::black));
        else if (number < 0)
            return qVariantFromValue(QColor(Qt::red));
        return qVariantFromValue(QColor(Qt::blue));
    }

    if (role == Qt::TextAlignmentRole)
        if (!t.isEmpty() && (t.at(0).isNumber() || t.at(0) == '-'))
            return (int)(Qt::AlignRight | Qt::AlignVCenter);

    return QTableWidgetItem::data(role);
}

void SpreadSheetItem::setData(int role, const QVariant &value)
{
    QTableWidgetItem::setData(role, value);
    if (tableWidget())
        tableWidget()->viewport()->update();
}

QVariant SpreadSheetItem::display() const
{
    // avoid circular dependencies
    if (isResolving)
        return QVariant();
    isResolving = true;
    QVariant result = computeFormula(formula(), tableWidget(), this);
    isResolving = false;
    return result;
}

QVariant SpreadSheetItem::computeFormula(const QString &formula,
                                         const QTableWidget *widget,
                                         const QTableWidgetItem *self)
{
    // check if the string is actually a formula or not
    QStringList list = formula.split(' ');
    if (list.isEmpty() || !widget)
        return formula; // its a normal string

    QString op = list.value(0).toLower();

    int firstRow = -1;
    int firstCol = -1;
    int secondRow = -1;
    int secondCol = -1;

    if (list.count() > 1)
        decode_pos(list.value(1), &firstRow, &firstCol);
    if (list.count() > 2)
        decode_pos(list.value(2), &secondRow, &secondCol);

    const QTableWidgetItem *start = widget->item(firstRow, firstCol);
    const QTableWidgetItem *end = widget->item(secondRow, secondCol);

    int firstVal = start ? start->text().toInt() : 0;
    int secondVal = end ? end->text().toInt() : 0;

    QVariant result;
    if (op == "sum") {
        int sum = 0;
        for (int r = firstRow; r <= secondRow; ++r) {
            for (int c = firstCol; c <= secondCol; ++c) {
                const QTableWidgetItem *tableItem = widget->item(r, c);
                if (tableItem && tableItem != self)
                    sum += tableItem->text().toInt();
            }
        }
        result = sum;
    } else if (op == "+") {
        result = (firstVal + secondVal);
    } else if (op == "-") {
        result = (firstVal - secondVal);
    } else if (op == "*") {
        result = (firstVal * secondVal);
    } else if (op == "/") {
        if (secondVal == 0)
            result = QString("nan");
        else
            result = (firstVal / secondVal);
    } else if (op == "=") {
        if (start)
        result = start->text();
    } else {
        result = formula;
    }

    return result;
}

#if !defined(QT_NO_DBUS) && defined(Q_OS_UNIX)
#include <QtDBus/QtDBus>

class SpreadSheetAdaptor : public QDBusAbstractAdaptor
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "com.trolltech.DBus.SpreadSheetDemo")

public:
    SpreadSheetAdaptor(QTableWidget *table) : QDBusAbstractAdaptor(table), table(table)
    { QDBusConnection::sessionBus().registerObject("/SpreadSheetDemo", table); }

public slots:
    QString computeFormula(const QString &formula)
    { return SpreadSheetItem::computeFormula(formula, table).toString(); }
private:
    QTableWidget *table;
};
#endif // QT_NO_DBUS

class SpreadSheet : public QMainWindow
{
    Q_OBJECT
public:
    SpreadSheet(int rows, int cols, QWidget *parent = 0);

public slots:
    void updateStatus(QTableWidgetItem *item);
    void updateColor(QTableWidgetItem *item);
    void updateLineEdit(QTableWidgetItem *item);
    void returnPressed();
    void selectColor();
    void selectFont();
    void clear();
    void showAbout();

    void actionSum();
    void actionSubtract();
    void actionAdd();
    void actionMultiply();
    void actionDivide();

protected:
    void setupContextMenu();
    void setupContents();

    void setupMenuBar();
    void createActions();

    void actionMath_helper(const QString &title, const QString &op);
    bool runInputDialog(const QString &title,
                        const QString &c1Text,
                        const QString &c2Text,
                        const QString &opText,
                        const QString &outText,
                        QString *cell1, QString *cell2, QString *outCell);

private:
    QToolBar *toolBar;
    QAction *colorAction;
    QAction *fontAction;
    QAction *firstSeparator;
    QAction *cell_sumAction;
    QAction *cell_addAction;
    QAction *cell_subAction;
    QAction *cell_mulAction;
    QAction *cell_divAction;
    QAction *secondSeparator;
    QAction *clearAction;
    QAction *aboutSpreadSheet;
    QAction *exitAction;

    QLabel *cellLabel;
    QTableWidget *table;
    QLineEdit *formulaInput;
};

SpreadSheet::SpreadSheet(int rows, int cols, QWidget *parent)
    : QMainWindow(parent)
{
    addToolBar(toolBar = new QToolBar());
    formulaInput = new QLineEdit();

    cellLabel = new QLabel(toolBar);
    cellLabel->setMinimumSize(80, 0);

    toolBar->addWidget(cellLabel);
    toolBar->addWidget(formulaInput);

    table = new QTableWidget(rows, cols, this);
    for (int c = 0; c < cols; ++c) {
        QString character(QChar('A' + c));
        table->setHorizontalHeaderItem(c, new QTableWidgetItem(character));
    }
    table->setItemPrototype(table->item(rows - 1, cols - 1));
    table->setItemDelegate(new SpreadSheetDelegate());
#if !defined(QT_NO_DBUS) && defined(Q_OS_UNIX)
    new SpreadSheetAdaptor(table);
#endif
    createActions();

    updateColor(0);
    setupMenuBar();
    setupContextMenu();
    setupContents();
    setCentralWidget(table);

    statusBar();
    connect(table, SIGNAL(currentItemChanged(QTableWidgetItem*, QTableWidgetItem*)),
            this, SLOT(updateStatus(QTableWidgetItem*)));
    connect(table, SIGNAL(currentItemChanged(QTableWidgetItem*, QTableWidgetItem*)),
            this, SLOT(updateColor(QTableWidgetItem*)));
    connect(table, SIGNAL(currentItemChanged(QTableWidgetItem*, QTableWidgetItem*)),
            this, SLOT(updateLineEdit(QTableWidgetItem*)));
    connect(table, SIGNAL(itemChanged(QTableWidgetItem*)),
            this, SLOT(updateStatus(QTableWidgetItem*)));
    connect(formulaInput, SIGNAL(returnPressed()), this, SLOT(returnPressed()));
    connect(table, SIGNAL(itemChanged(QTableWidgetItem*)),
            this, SLOT(updateLineEdit(QTableWidgetItem*)));
    setWindowTitle(tr("Spreadsheet"));
}

void SpreadSheet::createActions()
{
    cell_sumAction = new QAction(tr("Sum"), this);
    connect(cell_sumAction, SIGNAL(triggered()), this, SLOT(actionSum()));

    cell_addAction = new QAction(tr("&Add"), this);
    cell_addAction->setShortcut(Qt::CTRL | Qt::Key_Plus);
    connect(cell_addAction, SIGNAL(triggered()), this, SLOT(actionAdd()));

    cell_subAction = new QAction(tr("&Subtract"), this);
    cell_subAction->setShortcut(Qt::CTRL | Qt::Key_Minus);
    connect(cell_subAction, SIGNAL(triggered()), this, SLOT(actionSubtract()));

    cell_mulAction = new QAction(tr("&Multiply"), this);
    cell_mulAction->setShortcut(Qt::CTRL | Qt::Key_multiply);
    connect(cell_mulAction, SIGNAL(triggered()), this, SLOT(actionMultiply()));

    cell_divAction = new QAction(tr("&Divide"), this);
    cell_divAction->setShortcut(Qt::CTRL | Qt::Key_division);
    connect(cell_divAction, SIGNAL(triggered()), this, SLOT(actionDivide()));

    fontAction = new QAction(tr("Font..."), this);
    fontAction->setShortcut(Qt::CTRL|Qt::Key_F);
    connect(fontAction, SIGNAL(triggered()), this, SLOT(selectFont()));

    colorAction = new QAction(QPixmap(16, 16), tr("Background &Color..."), this);
    connect(colorAction, SIGNAL(triggered()), this, SLOT(selectColor()));

    clearAction = new QAction(tr("Clear"), this);
    clearAction->setShortcut(Qt::Key_Delete);
    connect(clearAction, SIGNAL(triggered()), this, SLOT(clear()));

    aboutSpreadSheet = new QAction(tr("About Spreadsheet"), this);
    connect(aboutSpreadSheet, SIGNAL(triggered()), this, SLOT(showAbout()));

    exitAction = new QAction(tr("E&xit"), this);
    connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

    firstSeparator = new QAction(this);
    firstSeparator->setSeparator(true);

    secondSeparator = new QAction(this);
    secondSeparator->setSeparator(true);


}

void SpreadSheet::setupMenuBar()
{
    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
    fileMenu->addAction(exitAction);

    QMenu *cellMenu = menuBar()->addMenu(tr("&Cell"));
    cellMenu->addAction(cell_addAction);
    cellMenu->addAction(cell_subAction);
    cellMenu->addAction(cell_mulAction);
    cellMenu->addAction(cell_divAction);