source: trunk/demos/spreadsheet/spreadsheet.cpp@ 569

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#include <QtGui>
#include "spreadsheet.h"
#include "spreadsheetdelegate.h"
#include "spreadsheetitem.h"
#include "printview.h"

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());

    createActions();
    updateColor(0);
    setupMenuBar();
    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()));

    printAction = new QAction(tr("&Print"), this);
    connect(printAction, SIGNAL(triggered()), this, SLOT(print()));

    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(printAction);
    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);
    cellMenu->addAction(cell_sumAction);
    cellMenu->addSeparator();
    cellMenu->addAction(colorAction);
    cellMenu->addAction(fontAction);

    menuBar()->addSeparator();

    QMenu *aboutMenu = menuBar()->addMenu(tr("&Help"));
    aboutMenu->addAction(aboutSpreadSheet);
}

void SpreadSheet::updateStatus(QTableWidgetItem *item)
{
    if (item && item == table->currentItem()) {
        statusBar()->showMessage(item->data(Qt::StatusTipRole).toString(),
                                 1000);
        cellLabel->setText(tr("Cell: (%1)").arg(encode_pos(table->row(item),
                                                           table->column(item))));
    }
}

void SpreadSheet::updateColor(QTableWidgetItem *item)
{
    QPixmap pix(16, 16);
    QColor col;
    if (item)
        col = item->backgroundColor();
    if (!col.isValid())
        col = palette().base().color();

    QPainter pt(&pix);
    pt.fillRect(0, 0, 16, 16, col);

    QColor lighter = col.light();
    pt.setPen(lighter);
    QPoint lightFrame[] = { QPoint(0, 15), QPoint(0, 0), QPoint(15, 0) };
    pt.drawPolyline(lightFrame, 3);

    pt.setPen(col.dark());
    QPoint darkFrame[] = { QPoint(1, 15), QPoint(15, 15), QPoint(15, 1) };
    pt.drawPolyline(darkFrame, 3);

    pt.end();

    colorAction->setIcon(pix);
}

void SpreadSheet::updateLineEdit(QTableWidgetItem *item)
{
    if (item != table->currentItem())
        return;
    if (item)
        formulaInput->setText(item->data(Qt::EditRole).toString());
    else
        formulaInput->clear();
}

void SpreadSheet::returnPressed()
{
    QString text = formulaInput->text();
    int row = table->currentRow();
    int col = table->currentColumn();
    QTableWidgetItem *item = table->item(row, col);
    if (!item)
        table->setItem(row, col, new SpreadSheetItem(text));
    else
        item->setData(Qt::EditRole, text);
    table->viewport()->update();
}

void SpreadSheet::selectColor()
{
    QTableWidgetItem *item = table->currentItem();
    QColor col = item ? item->backgroundColor() : table->palette().base().color();
    col = QColorDialog::getColor(col, this);
    if (!col.isValid())
        return;

    QList<QTableWidgetItem*> selected = table->selectedItems();
    if (selected.count() == 0)
        return;

    foreach(QTableWidgetItem *i, selected)
        if (i)
            i->setBackgroundColor(col);

    updateColor(table->currentItem());
}

void SpreadSheet::selectFont()
{
    QList<QTableWidgetItem*> selected = table->selectedItems();
    if (selected.count() == 0)
        return;

    bool ok = false;
    QFont fnt = QFontDialog::getFont(&ok, font(), this);

    if (!ok)
        return;
    foreach(QTableWidgetItem *i, selected)
        if (i)