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QT学习笔记2--QT做查找对话框

20 Jan 2011
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今天看了C++ GUI Programming with QT 的第二章第一节,不急,慢慢来,每天学一些。

话说看英文版感觉确实不错,对比了下中文的,感觉中文版有的翻译还是没把握好,正好权当学英语。

首先是建立查找对话框类,头文件finddialog.h:

#ifndef FINDDIALOG_H
#define FINDDIALOG_H
#include 
class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;
class FindDialog : public QDialog
{
    Q_OBJECT
public:
    FindDialog(QWidget *parent = 0);
signals:
    void findNext(const QString &str;, Qt::CaseSensitivity cs);
    void findPrevious(const QString &str;, Qt::CaseSensitivity);
private slots:
    void findClicked();
    void enableFindButton(const QString &text;);
private:
    QLabel *label;
    QLineEdit *lineEdit;
    QCheckBox *caseCheckBox;
    QCheckBox *backwardCheckBox;
    QPushButton *findButton;
    QPushButton *closeButton;
};
#endif
 // FINDDIALOG_H

然后是类实现finddialog.cpp

#include 
#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;"));
    backwardCheckBox = new QCheckBox(tr("Search &backward;"));

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

    closeButton = new QPushButton(tr("Close"));

    connect(lineEdit, SIGNAL(textChanged(const QString &)),
            this, SLOT(enableFindButton(const QString &)));
    connect(findButton, SIGNAL(clicked()),
            this, SLOT(findCLicked()));
    connect(closeButton, SIGNAL(clicked()),
            this, SLOT(close()));

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

    QVBoxLayout *leftLayout = new QVBoxLayout;
    leftLayout->addLayout(topLeftLayout);
    leftLayout->addWidget(caseCheckBox);
    leftLayout->addWidget(backwardCheckBox);

    QVBoxLayout *rightLayout = new QVBoxLayout;
    rightLayout->addWidget(findButton);
    rightLayout->addWidget(closeButton);
    rightLayout->addStretch();

    QHBoxLayout *mainLayout = new QHBoxLayout;
    mainLayout->addLayout(leftLayout);
    mainLayout->addLayout(rightLayout);
    setLayout(mainLayout);

    setWindowTitle(tr("Find"));
    setFixedHeight(sizeHint().height());
}

void FindDialog::findClicked()
{
    QString text = lineEdit->text();
    Qt::CaseSensitivity cs =
            caseCheckBox->isChecked() ? Qt::CaseSensitive
                                      : Qt::CaseInsensitive;
    if(backwardCheckBox->isChecked()){
        emit findPrevious(text, cs);
    }
    else {
        emit findNext(text, cs);
    }
}

void FindDialog::enableFindButton(const QString &text;)
{
    findButton->setEnabled(!text.isEmpty());
}

最后是主函数调用类main.cpp:

#include 
#include "finddialog.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    FindDialog *dialog = new FindDialog;
    dialog->show();
    return app.exec();
}

截图: 没啥好说,只为纪念自己学习的每一步。 已经12点了,睡觉咯。