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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();
}