以一个查找对话框为例子开始学习 用Qt创建一个对话框程序
首先使用手工编码创建一个查找对话框程序
1 #include "finddialog.h" 2 #include<QtGui> 3 4 FindDialog::FindDialog(QWidget *parent) : 5 QDialog(parent) 6 { //查找窗口的部件的创建和初始化 7 text = new QLineEdit; 8 caseSensCheck = new QCheckBox(tr("Match Case")); 9 prevCheck = new QCheckBox(tr("Backward")); 10 findText = new QPushButton(tr("Find")); 11 stopFind = new QPushButton(tr("Stop")); 12 //信号-槽的链接 13 this->connect(text,SIGNAL(textChanged(const QString&)), 14 this,SLOT(findBtnEnabled(const QString&))); 15 this->connect(stopFind,SIGNAL(clicked()), 16 this,SLOT(close())); 17 this->connect(findText,SIGNAL(clicked()), 18 this,SLOT(findClicked())); 19 this->connect(this, 20 SIGNAL(findPrevious(const QString&,Qt::CaseSensitivity)), 21 this, 22 SLOT(findPrevious_Slot(const QString&,Qt::CaseSensitivity))); 23 this->connect(this, 24 SIGNAL(findNext(const QString&,Qt::CaseSensitivity)), 25 this, 26 SLOT(findNext_Slot(const QString&,Qt::CaseSensitivity))); 27 //窗口部件的状态 28 caseSensCheck->setChecked(false); 29 prevCheck->setChecked(false); 30 findText->setEnabled(false); 31 stopFind->setEnabled(true); 32 this->setWindowTitle(tr("FindDialog")); 33 34 //窗口布局的初始化 35 hLayout = new QHBoxLayout; 36 vLeftLayout = new QVBoxLayout; 37 vRightLayout = new QVBoxLayout; 38 vLeftLayout->addWidget(text); 39 vLeftLayout->addWidget(caseSensCheck); 40 vLeftLayout->addWidget(prevCheck); 41 vRightLayout->addWidget(findText); 42 vRightLayout->addWidget(stopFind); 43 hLayout->addLayout(vLeftLayout); 44 hLayout->addLayout(vRightLayout); 45 46 this->setLayout(hLayout); 47 } 48 49 //向前查找槽函数 50 void FindDialog::findPrevious_Slot(const QString&txt,Qt::CaseSensitivity cs) 51 { 52 this->setWindowTitle(tr("FindPrevious")); 53 this->update(); 54 } 55 56 //向后查找槽函数 57 void FindDialog::findNext_Slot(const QString&txt,Qt::CaseSensitivity cs) 58 { 59 this->setWindowTitle(tr("FindNext")); 60 this->update(); 61 } 62 63 //查找按钮点击槽函数 64 void FindDialog::findClicked() 65 { 66 QString txt = text->text(); 67 //获取是否大小写匹配的状态 68 Qt::CaseSensitivity cs = 69 caseSensCheck->isChecked()?Qt::CaseSensitive: 70 Qt::CaseInsensitive; 71 if(prevCheck->isChecked()) 72 emit findPrevious(txt,cs);//发射向前查找信号 73 else 74 emit findNext(txt,cs);//发射向后查找信号 75 } 76 //停止查找槽函数 77 void FindDialog::stopClicked() 78 { 79 this->close(); 80 } 81 //查找按钮使能槽函数 82 void FindDialog::findBtnEnabled(const QString &txt) 83 { 84 findText->setEnabled(!txt.isEmpty()); 85 } 86 //析构函数，销毁窗口部件 和 窗口布局 87 FindDialog::~FindDialog() 88 { 89 delete text; 90 delete findText; 91 delete stopFind; 92 delete caseSensCheck; 93 delete prevCheck; 94 delete vLeftLayout; 95 delete vRightLayout; 96 delete hLayout; 97 }
//main.cpp
1 #include <QApplication> 2 #include<finddialog.h> 3 4 int main(int argc, char *argv[]) 5 { 6 QApplication a(argc, argv);
//创建并显示查找窗口 7 FindDialog* dlg = new FindDialog; 8 dlg->show(); 9 return a.exec(); 10 }
1 //finddialog.h 2 #ifndef FINDDIALOG_H 3 #define FINDDIALOG_H 4 5 #include <QDialog> 6 #include<QLineEdit> 7 #include<QCheckBox> 8 #include<QPushButton> 9 #include<QHBoxLayout> 10 #include<QVBoxLayout> 11 12 class FindDialog : public QDialog 13 { 14 Q_OBJECT 15 public: 16 explicit FindDialog(QWidget *parent = 0); 17 ~FindDialog(); 18 signals: 19 //其他槽函数 20 public slots: 21 void findBtnEnabled(const QString &txt); 22 void findClicked(); 23 void stopClicked(); 24 //查找槽函数 25 public slots: 26 void findPrevious_Slot(const QString&txt,Qt::CaseSensitivity cs); 27 void findNext_Slot(const QString&txt,Qt::CaseSensitivity cs); 28 //查找窗口的部件 29 public: 30 QLineEdit* text; 31 QCheckBox* caseSensCheck; 32 QCheckBox* prevCheck; 33 QPushButton* findText; 34 QPushButton* stopFind; 35 signals://自定义的查找信号 36 void findNext(const QString &str , Qt::CaseSensitivity cs); 37 void findPrevious(const QString &str , Qt::CaseSensitivity cs); 38 39 public://查找窗口的布局 40 QHBoxLayout* hLayout; 41 QVBoxLayout* vLeftLayout; 42 QVBoxLayout* vRightLayout; 43 }; 44 45 #endif // FINDDIALOG_H