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#include <QtGui>

#include "mainwindow.h"

MainWindow::MainWindow()

{

    QMenu *fileMenu = new QMenu(tr("&File"));

    fileMenu->addAction(tr("&Open..."), this, SLOT(openFile()),

                        QKeySequence(tr("Ctrl+O", "File|Open")));

    QAction *quitAction = fileMenu->addAction(tr("E&xit"), this, SLOT(close()));

    quitAction->setShortcut(tr("Ctrl+Q"));

    QMenu *editMenu = new QMenu(tr("&Edit"));

    cutAction = editMenu->addAction(tr("Cu&t"), this, SLOT(cutSelection()));

    cutAction->setShortcut(tr("Ctrl+X"));

    cutAction->setEnabled(false);

    copyAction = editMenu->addAction(tr("&Copy"), this, SLOT(copySelection()));

    copyAction->setShortcut(tr("Ctrl+C"));

    copyAction->setEnabled(false);

    pasteAction = editMenu->addAction(tr("&Paste"), this, SLOT(pasteSelection()));

    pasteAction->setShortcut(tr("Ctrl+V"));

    pasteAction->setEnabled(false);

    QMenu *selectMenu = new QMenu(tr("&Select"));

    selectMenu->addAction(tr("&Word"), this, SLOT(selectWord()));

    selectMenu->addAction(tr("&Line"), this, SLOT(selectLine()));

    selectMenu->addAction(tr("&Block"), this, SLOT(selectBlock()));

    selectMenu->addAction(tr("&Frame"), this, SLOT(selectFrame()));

    menuBar()->addMenu(fileMenu);

    menuBar()->addMenu(editMenu);

    menuBar()->addMenu(selectMenu);

    editor = new QTextEdit(this);

    document = new QTextDocument(this);

    editor->setDocument(document);

    connect(editor, SIGNAL(selectionChanged()), this, SLOT(updateMenus()));

    setCentralWidget(editor);

    setWindowTitle(tr("Text Document Writer"));

}

void MainWindow::openFile()

{

    QString fileName = QFileDialog::getOpenFileName(this,

        tr("Open file"), currentFile, "HTML files (*.html);;Text files (*.txt)");

    if (!fileName.isEmpty()) {

        QFileInfo info(fileName);

        if (info.completeSuffix() == "html") {

            QFile file(fileName);

            if (file.open(QFile::ReadOnly)) {

                editor->setHtml(QString(file.readAll()));

                file.close();

                currentFile = fileName;

            }

        } else if (info.completeSuffix() == "txt") {

            QFile file(fileName);

            if (file.open(QFile::ReadOnly)) {

                editor->setPlainText(file.readAll());

                file.close();

                currentFile = fileName;

            }

        }

    }

}

void MainWindow::cutSelection()

{

    QTextCursor cursor = editor->textCursor();

    if (cursor.hasSelection()) {

        selection = cursor.selection();

        cursor.removeSelectedText();

    }

}

void MainWindow::copySelection()

{

    QTextCursor cursor = editor->textCursor();

    if (cursor.hasSelection()) {

        selection = cursor.selection();

        cursor.clearSelection();

    }

}

void MainWindow::pasteSelection()

{

    QTextCursor cursor = editor->textCursor();

    cursor.insertFragment(selection);

}

void MainWindow::selectWord()

{

    QTextCursor cursor = editor->textCursor();

    QTextBlock block = cursor.block();

//! [0]

    cursor.beginEditBlock();

//! [1]

    cursor.movePosition(QTextCursor::StartOfWord);

    cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);

//! [1]

    cursor.endEditBlock();

//! [0]

    editor->setTextCursor(cursor);

}

void MainWindow::selectLine()

{

    QTextCursor cursor = editor->textCursor();

    QTextBlock block = cursor.block();

    cursor.beginEditBlock();

    cursor.movePosition(QTextCursor::StartOfLine);

    cursor.movePosition(QTextCursor::EndOfLine, QTextCursor::KeepAnchor);

    cursor.endEditBlock();

    editor->setTextCursor(cursor);

}

void MainWindow::selectBlock()

{

    QTextCursor cursor = editor->textCursor();

    QTextBlock block = cursor.block();

    cursor.beginEditBlock();

    cursor.movePosition(QTextCursor::StartOfBlock);

    cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);

    cursor.endEditBlock();

    editor->setTextCursor(cursor);

}

void MainWindow::selectFrame()

{

    QTextCursor cursor = editor->textCursor();

    QTextFrame *frame = cursor.currentFrame();

    cursor.beginEditBlock();

    cursor.setPosition(frame->firstPosition());

    cursor.setPosition(frame->lastPosition(), QTextCursor::KeepAnchor);

    cursor.endEditBlock();

    editor->setTextCursor(cursor);

}

void MainWindow::updateMenus()

{

    QTextCursor cursor = editor->textCursor();

    cutAction->setEnabled(cursor.hasSelection());

    copyAction->setEnabled(cursor.hasSelection());

    pasteAction->setEnabled(!selection.isEmpty());

}