Find Dialog

FindDialog.h:

#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);/**FindDialog类的构造函数,parent 参数指定了它的父窗口部件,默认值是空指针, 则没有父对象*/
signals:
    void findNext(const QString &str, Qt::CaseSensitivity cs);
    void findPrevious(const QString &str, Qt::CaseSensitivity cs);/*signals部分声明了当用户单击Find按钮时对话框所发射的两个信号

                                                                   Qt::sensitivity是一个枚举类型，他有Qt::CaseInsensitive

                                                                    和 Qt::CaseSensitive两个取值*/
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

　　FindDialog.cpp:

 1 #include <QtGui>
 2 
 3 #include "FindDialog.h"
 4 
 5 FindDialog::FindDialog(QWidget *parent)/*FindDialog 的构造函数*/
 6     : QDialog(parent)
 7 {
 8     label = new QLabel(tr("Find &what:"));
 9     lineEdit = new QLineEdit;
10     label->setBuddy(lineEdit);
11 
12     caseCheckBox = new QCheckBox(tr("Match &case"));
13     backwardCheckBox = new QCheckBox(tr("Search &backward"));
14 
15     findButton = new QPushButton(tr("&Find"));
16     findButton->setDefault(true);
17     findButton->setEnabled(false);
18 
19     closeButton = new QPushButton(tr("Close"));
20 
21     connect(lineEdit,SIGNAL(textChanged(const QString& )),
22             this,SLOT(enableFindButton(const QString& )));
23     connect(findButton,SIGNAL(clicked()),
24             this, SLOT(findClicked()));
25     connect(closeButton,SIGNAL(clicked()),
26             this, SLOT(close()));
27 
28     QHBoxLayout *topLeftLayout = new QHBoxLayout;
29     topLeftLayout->addWidget(label);
30     topLeftLayout->addWidget(lineEdit);
31 
32     QVBoxLayout *leftLayout = new QVBoxLayout;
33     leftLayout->addLayout(topLeftLayout);
34     leftLayout->addWidget(caseCheckBox);
35     leftLayout->addWidget(backwardCheckBox);
36 
37     QVBoxLayout *rightLayout = new QVBoxLayout;
38     rightLayout->addWidget(findButton);
39     rightLayout->addWidget(closeButton);
40     rightLayout->addStretch();
41 
42     QHBoxLayout *mainLayout = new QHBoxLayout;
43     mainLayout->addLayout(leftLayout);
44     mainLayout->addLayout(rightLayout);
45     setLayout(mainLayout);
46 
47     setWindowTitle(tr("Find"));
48     setFixedHeight(sizeHint().height());
49 
50 }
51 
52 void FindDialog::findClicked()
53 {
54     QString text = lineEdit->text();
55     Qt::CaseSensitivity cs =
56             caseCheckBox->isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive;
57     if(backwardCheckBox->isChecked()){
58         emit findPrevious(text,cs);
59     }
60     else {
61         emit findNext(text,cs);
62     }
63 
64 }
65 
66 void FindDialog::enableFindButton(const QString &text)
67 {
68     findButton->setEnabled(!text.isEmpty());
69 }

 

posted @ 2014-05-21 09:21  永久指针  阅读(598)  评论(0)  编辑  收藏  举报