mainwindow.cpp Example File
mainwindows/menus/mainwindow.cpp
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** This file is part of the documentation of the Qt Toolkit.
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#include <QtGui>
#include "mainwindow.h"
MainWindow::MainWindow()
{
QWidget *w = new QWidget;
setCentralWidget(w);
QWidget *topFiller = new QWidget;
topFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
infoLabel = new QLabel(tr("<i>Choose a menu option, or right-click to "
"invoke a context menu</i>"));
infoLabel->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
infoLabel->setAlignment(Qt::AlignCenter);
QWidget *bottomFiller = new QWidget;
bottomFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
QVBoxLayout *vbox = new QVBoxLayout;
vbox->setMargin(5);
vbox->addWidget(topFiller);
vbox->addWidget(infoLabel);
vbox->addWidget(bottomFiller);
w->setLayout(vbox);
createActions();
createMenus();
statusBar()->showMessage(tr("A context menu is available by right-clicking"));
setWindowTitle(tr("Menus"));
setMinimumSize(160, 160);
resize(480, 320);
}
void MainWindow::contextMenuEvent(QContextMenuEvent *event)
{
QMenu menu(this);
menu.addAction(cutAct);
menu.addAction(copyAct);
menu.addAction(pasteAct);
menu.exec(event->globalPos());
}
void MainWindow::newFile()
{
infoLabel->setText(tr("Invoked <b>File|New</b>"));
}
void MainWindow::open()
{
infoLabel->setText(tr("Invoked <b>File|Open</b>"));
}
void MainWindow::save()
{
infoLabel->setText(tr("Invoked <b>File|Save</b>"));
}
void MainWindow::print()
{
infoLabel->setText(tr("Invoked <b>File|Print</b>"));
}
void MainWindow::undo()
{
infoLabel->setText(tr("Invoked <b>Edit|Undo</b>"));
}
void MainWindow::redo()
{
infoLabel->setText(tr("Invoked <b>Edit|Redo</b>"));
}
void MainWindow::cut()
{
infoLabel->setText(tr("Invoked <b>Edit|Cut</b>"));
}
void MainWindow::copy()
{
infoLabel->setText(tr("Invoked <b>Edit|Copy</b>"));
}
void MainWindow::paste()
{
infoLabel->setText(tr("Invoked <b>Edit|Paste</b>"));
}
void MainWindow::bold()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Bold</b>"));
}
void MainWindow::italic()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Italic</b>"));
}
void MainWindow::leftAlign()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Left Align</b>"));
}
void MainWindow::rightAlign()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Right Align</b>"));
}
void MainWindow::justify()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Justify</b>"));
}
void MainWindow::center()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Center</b>"));
}
void MainWindow::setLineSpacing()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Set Line Spacing</b>"));
}
void MainWindow::setParagraphSpacing()
{
infoLabel->setText(tr("Invoked <b>Edit|Format|Set Paragraph Spacing</b>"));
}
void MainWindow::about()
{
infoLabel->setText(tr("Invoked <b>Help|About</b>"));
QMessageBox::about(this, tr("About Menu"),
tr("The <b>Menu</b> example shows how to create "
"menu-bar menus and context menus."));
}
void MainWindow::aboutQt()
{
infoLabel->setText(tr("Invoked <b>Help|About Qt</b>"));
}
void MainWindow::createActions()
{
newAct = new QAction(tr("&New"), this);
newAct->setShortcut(tr("Ctrl+N"));
newAct->setStatusTip(tr("Create a new file"));
connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
openAct = new QAction(tr("&Open..."), this);
openAct->setShortcut(tr("Ctrl+O"));
openAct->setStatusTip(tr("Open an existing file"));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
saveAct = new QAction(tr("&Save"), this);
saveAct->setShortcut(tr("Ctrl+S"));
saveAct->setStatusTip(tr("Save the document to disk"));
connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
printAct = new QAction(tr("&Print..."), this);
printAct->setShortcut(tr("Ctrl+P"));
printAct->setStatusTip(tr("Print the document"));
connect(printAct, SIGNAL(triggered()), this, SLOT(print()));
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
exitAct->setStatusTip(tr("Exit the application"));
connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
undoAct = new QAction(tr("&Undo"), this);
undoAct->setShortcut(tr("Ctrl+Z"));
undoAct->setStatusTip(tr("Undo the last operation"));
connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));
redoAct = new QAction(tr("&Redo"), this);
redoAct->setShortcut(tr("Ctrl+Y"));
redoAct->setStatusTip(tr("Redo the last operation"));
connect(redoAct, SIGNAL(triggered()), this, SLOT(redo()));
cutAct = new QAction(tr("Cu&t"), this);
cutAct->setShortcut(tr("Ctrl+X"));
cutAct->setStatusTip(tr("Cut the current selection's contents to the "
"clipboard"));
connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));
copyAct = new QAction(tr("&Copy"), this);
copyAct->setShortcut(tr("Ctrl+C"));
copyAct->setStatusTip(tr("Copy the current selection's contents to the "
"clipboard"));
connect(copyAct, SIGNAL(triggered()), this, SLOT(copy()));
pasteAct = new QAction(tr("&Paste"), this);
pasteAct->setShortcut(tr("Ctrl+V"));
pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
"selection"));
connect(pasteAct, SIGNAL(triggered()), this, SLOT(paste()));
boldAct = new QAction(tr("&Bold"), this);
boldAct->setCheckable(true);
boldAct->setShortcut(tr("Ctrl+B"));
boldAct->setStatusTip(tr("Make the text bold"));
connect(boldAct, SIGNAL(triggered()), this, SLOT(bold()));
QFont boldFont = boldAct->font();
boldFont.setBold(true);
boldAct->setFont(boldFont);
italicAct = new QAction(tr("&Italic"), this);
italicAct->setCheckable(true);
italicAct->setShortcut(tr("Ctrl+I"));
italicAct->setStatusTip(tr("Make the text italic"));
connect(italicAct, SIGNAL(triggered()), this, SLOT(italic()));
QFont italicFont = italicAct->font();
italicFont.setItalic(true);
italicAct->setFont(italicFont);
leftAlignAct = new QAction(tr("&Left Align"), this);
leftAlignAct->setCheckable(true);
leftAlignAct->setShortcut(tr("Ctrl+L"));
leftAlignAct->setStatusTip(tr("Left align the selected text"));
connect(leftAlignAct, SIGNAL(triggered()), this, SLOT(leftAlign()));
rightAlignAct = new QAction(tr("&Right Align"), this);
rightAlignAct->setCheckable(true);
rightAlignAct->setShortcut(tr("Ctrl+R"));
rightAlignAct->setStatusTip(tr("Right align the selected text"));
connect(rightAlignAct, SIGNAL(triggered()), this, SLOT(rightAlign()));
justifyAct = new QAction(tr("&Justify"), this);
justifyAct->setCheckable(true);
justifyAct->setShortcut(tr("Ctrl+J"));
justifyAct->setStatusTip(tr("Justify the selected text"));
connect(justifyAct, SIGNAL(triggered()), this, SLOT(justify()));
centerAct = new QAction(tr("&Center"), this);
centerAct->setCheckable(true);
centerAct->setShortcut(tr("Ctrl+E"));
centerAct->setStatusTip(tr("Center the selected text"));
connect(centerAct, SIGNAL(triggered()), this, SLOT(center()));
alignmentGroup = new QActionGroup(this);
alignmentGroup->addAction(leftAlignAct);
alignmentGroup->addAction(rightAlignAct);
alignmentGroup->addAction(justifyAct);
alignmentGroup->addAction(centerAct);
leftAlignAct->setChecked(true);
setLineSpacingAct = new QAction(tr("Set &Line Spacing..."), this);
setLineSpacingAct->setStatusTip(tr("Change the gap between the lines of a "
"paragraph"));
connect(setLineSpacingAct, SIGNAL(triggered()), this, SLOT(setLineSpacing()));
setParagraphSpacingAct = new QAction(tr("Set &Paragraph Spacing..."), this);
setLineSpacingAct->setStatusTip(tr("Change the gap between paragraphs"));
connect(setParagraphSpacingAct, SIGNAL(triggered()),
this, SLOT(setParagraphSpacing()));
aboutAct = new QAction(tr("&About"), this);
aboutAct->setStatusTip(tr("Show the application's About box"));
connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
aboutQtAct = new QAction(tr("About &Qt"), this);
aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
connect(aboutQtAct, SIGNAL(triggered()), this, SLOT(aboutQt()));
}
void MainWindow::createMenus()
{
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(newAct);
fileMenu->addAction(openAct);
fileMenu->addAction(saveAct);
fileMenu->addAction(printAct);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
editMenu = menuBar()->addMenu(tr("&Edit"));
editMenu->addAction(undoAct);
editMenu->addAction(redoAct);
editMenu->addSeparator();
editMenu->addAction(cutAct);
editMenu->addAction(copyAct);
editMenu->addAction(pasteAct);
editMenu->addSeparator();
formatMenu = editMenu->addMenu(tr("&Format"));
formatMenu->addAction(boldAct);
formatMenu->addAction(italicAct);
formatMenu->addSeparator()->setText(tr("Alignment"));
formatMenu->addAction(leftAlignAct);
formatMenu->addAction(rightAlignAct);
formatMenu->addAction(justifyAct);
formatMenu->addAction(centerAct);
formatMenu->addSeparator();
formatMenu->addAction(setLineSpacingAct);
formatMenu->addAction(setParagraphSpacingAct);
helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
}
