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),#ifndefFINDDIALOG_H#defineFINDDIALOG_H#includeclassQCheckBox;classQLabel;classQLineEdit;classQPushButton;classFindDialog:publicQDialogQ_OBJECTpublic:FindDialog(QWidget*parent=0,constchar*name=0);signals:voidfindNext(constQString#endif,finddialog.h(2),#ifndefFINDDIALOG_H#defineFINDDIALOG_H#includeclassQCheckBox;classQLabel;classQLineEdit;classQPushButton;,finddialog.h(3),classFindDialog:publicQDialogQ_OBJECTpublic:FindDialog(QWidget*parent=0,constchar*name=0);signals:voidfindNext(constQString,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#includefinddialog.h,finddialog.cpp(2),FindDialog:FindDialog(QWidget*parent,constchar*name):QDialog(parent,name)setCaption(tr(Find);label=newQLabel(tr(Find,finddialog.cpp(3),connect(lineEdit,SIGNAL(textChanged(constQString,finddialog.cpp(4),QHBoxLayout*topLeftLayout=newQHBoxLayout;topLeftLayout-addWidget(label);topLeftLayout-addWidget(lineEdit);QVBoxLayout*leftLayout=newQVBoxLayout;leftLayout-addLayout(topLeftLayout);leftLayout-addWidget(caseCheckBox);leftLayout-addWidget(backwardCheckBox);QVBoxLayout*rightLayout=newQVBoxLayout;rightLayout-addWidget(findButton);rightLayout-addWidget(closeButton);rightLayout-addStretch(1);QHBoxLayout*mainLayout=newQHBoxLayout(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,QHBoxLayoutQVBoxLayoutQGridLayout,窗口布局,finddialog.cpp(5),voidFindDialog:findClicked()QStringtext=lineEdit-text();boolcaseSensitive=caseCheckBox-isOn();if(backwardCheckBox-isOn()emitfindPrev(text,caseSensitive);elseemitfindNext(text,caseSensitive);voidFindDialog:enableFindButton(constQString,主函数main.cpp,#include#includefinddialog.hintmain(intargc,char*argv)QApplicationapp(argc,argv);FindDialog*dialog=newFindDialog;app.setMainWidget(dialog);dialog-show();returnapp.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#includeaclock.hclassAnalogClock;3将finddialog.cpp文件的f