booleanwindow.cpp

QT4 gui programming的随书光盘

#include <QtGui>

#include "booleanmodel.h"
#include "booleanparser.h"
#include "booleanwindow.h"

BooleanWindow::BooleanWindow()
{
    label = new QLabel(tr("Boolean expression:"));
    lineEdit = new QLineEdit;

    booleanModel = new BooleanModel(this);

    treeView = new QTreeView;
    treeView->setModel(booleanModel);

    connect(lineEdit, SIGNAL(textChanged(const QString &)),
            this, SLOT(booleanExpressionChanged(const QString &)));

    QGridLayout *layout = new QGridLayout;
    layout->addWidget(label, 0, 0);
    layout->addWidget(lineEdit, 0, 1);
    layout->addWidget(treeView, 1, 0, 1, 2);
    setLayout(layout);

    setWindowTitle(tr("Boolean Parser"));
}

void BooleanWindow::booleanExpressionChanged(const QString &expr)
{
    BooleanParser parser;
    Node *rootNode = parser.parse(expr);
    booleanModel->setRootNode(rootNode);
}