QT学习笔记2–QT做查找对话框

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:

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#ifndef FINDDIALOG_H
#define FINDDIALOG_H
#include <QDialog>
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

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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"));
    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:

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#include <QApplication>
#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。

发布者

Tanky Woo

Tanky Woo,[个人主页:https://tankywoo.com] / [新博客:https://blog.tankywoo.com]

《QT学习笔记2–QT做查找对话框》有184个想法

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