qt窗口布局及自定义类.ppt

qt窗口布局及自定义类,说明,以下将通过一个例子讲解自定义类的qt程序设计的主要流程,要设计的界面,通过两个文件：finddialog.h 和 finddialog.cpp来实现，即定义一个类,finddialog.h (1),#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, const char *name = 0); signals: void findNext(const QString #endif,finddialog.h(2),#ifndef FINDDIALOG_H #define FINDDIALOG_H #include class QCheckBox; class QLabel; class QLineEdit; class QPushButton;,finddialog.h(3),class FindDialog : public QDialog Q_OBJECT public: FindDialog(QWidget *parent = 0, const char *name = 0); signals: void findNext(const QString ,finddialog.h (4),private: QLabel *label; QLineEdit *lineEdit; QCheckBox *caseCheckBox; QCheckBox *backwardCheckBox; QPushButton *findButton; QPushButton *closeButton; ; #endif,finddialog.cpp (1),#include #include #include #include #include #include “finddialog.h“,finddialog.cpp (2),FindDialog:FindDialog(QWidget *parent, const char *name) : QDialog(parent, name) setCaption(tr(“Find“); label = new QLabel(tr(“Find ,finddialog.cpp (3),connect(lineEdit, SIGNAL(textChanged(const QString ,finddialog.cpp (4),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(1); QHBoxLayout *mainLayout = new QHBoxLayout(this); mainLayout-setMargin(30); mainLayout-setSpacing(6); mainLayout-addLayout(leftLayout); mainLayout-addLayout(rightLayout); ,注意何时调用addWidget，何时调用addLayout,总布局需要this,窗口布局,QHBoxLayout QVBoxLayout QGridLayout,窗口布局,finddialog.cpp (5),void FindDialog:findClicked() QString text = lineEdit-text(); bool caseSensitive = caseCheckBox-isOn(); if (backwardCheckBox-isOn() emit findPrev(text, caseSensitive); else emit findNext(text, caseSensitive); void FindDialog:enableFindButton(const QString ,#include #include “finddialog.h“ int main(int argc, char *argv) QApplication app(argc, argv); FindDialog *dialog = new FindDialog; app.setMainWidget(dialog); dialog-show(); return app.exec(); ,多窗口调用,以前面的例子为例讲解多程序调用的方法： 1 将find按钮名称改为clock按钮，将/ qt-embedded-free-3.1.1/examples/aclock中的aclock.cpp和aclock.h拷贝到当前目录 2 在finddialog.h里加上 #include“aclock.h“ class AnalogClock; 3 将finddialog.cpp文