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finddialog.cpp Example File
dialogs/extension/finddialog.cpp

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 #include <QtGui>

 #include "finddialog.h"

 FindDialog::FindDialog(QWidget *parent)
     : QDialog(parent)
 {
     label = new QLabel(tr("Find &what:"));
     lineEdit = new QLineEdit;
     label->setBuddy(lineEdit);

     caseCheckBox = new QCheckBox(tr("Match &case"));
     fromStartCheckBox = new QCheckBox(tr("Search from &start"));
     fromStartCheckBox->setChecked(true);

     findButton = new QPushButton(tr("&Find"));
     findButton->setDefault(true);

     moreButton = new QPushButton(tr("&More"));
     moreButton->setCheckable(true);
     moreButton->setAutoDefault(false);

     buttonBox = new QDialogButtonBox(Qt::Vertical);
     buttonBox->addButton(findButton, QDialogButtonBox::ActionRole);
     buttonBox->addButton(moreButton, QDialogButtonBox::ActionRole);

     extension = new QWidget;

     wholeWordsCheckBox = new QCheckBox(tr("&Whole words"));
     backwardCheckBox = new QCheckBox(tr("Search &backward"));
     searchSelectionCheckBox = new QCheckBox(tr("Search se&lection"));

     connect(moreButton, SIGNAL(toggled(bool)), extension, SLOT(setVisible(bool)));

     QVBoxLayout *extensionLayout = new QVBoxLayout;
     extensionLayout->setMargin(0);
     extensionLayout->addWidget(wholeWordsCheckBox);
     extensionLayout->addWidget(backwardCheckBox);
     extensionLayout->addWidget(searchSelectionCheckBox);
     extension->setLayout(extensionLayout);

     QHBoxLayout *topLeftLayout = new QHBoxLayout;
     topLeftLayout->addWidget(label);
     topLeftLayout->addWidget(lineEdit);

     QVBoxLayout *leftLayout = new QVBoxLayout;
     leftLayout->addLayout(topLeftLayout);
     leftLayout->addWidget(caseCheckBox);
     leftLayout->addWidget(fromStartCheckBox);
     leftLayout->addStretch(1);

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout->setSizeConstraint(QLayout::SetFixedSize);
     mainLayout->addLayout(leftLayout, 0, 0);
     mainLayout->addWidget(buttonBox, 0, 1);
     mainLayout->addWidget(extension, 1, 0, 1, 2);
     setLayout(mainLayout);

     setWindowTitle(tr("Extension"));
     extension->hide();
 }


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Qt 4.6.3