By subclassing an existing Qt widget or directly subclassing QWidget, you can create a custom widget. The following directly subclass the existing Qt widgets:
As follows, subclass QLineEdit to realize the widgets you need. The reference code is as follows:
/**********************Subclassed header file********************* ********/
#ifndefLINEEDIT_H
#defineLINEEDIT_H
#include
#include
classLineEdit:publicQLineEdit
{
Q_OBJECT
public:
explicitLineEdit(QObject*parent=0);
protected:
voidmouseDoubleClickEvent(QMouseEvent*);
};
#endif//LINEEDIT_H
/**********************Subclassed source file********************* ********/
#include"lineedit.h"
#include
LineEdit::LineEdit(QObject*parent)
{
}
//Reimplement mouseDoubleClickEvent of QLineEdit class(QMouseEvent*event)
//Event processing function, so that when you double-click LineEdit, a message box will pop up
voidLineEdit::mouseDoubleClickEvent(QMouseEvent*event)
{
QMessageBox::informaTIon(this,tr("hint"),tr("you are right!"));
event->ignore();
}
The above is a LineEdit class of my own implementation, I double-click this LineEdit control, a message box will pop up.
First build a project, put the above two files under the project directory, and then implement your own code:
/**********************The header file of the main window ********************* *******/
#ifndefMYWIDGET_H
#defineMYWIDGET_H
#include
#include"lineedit.h"
classMyWidget:publicQWidget
{
Q_OBJECT
public:
explicitMyWidget(QWidget*parent=0);
private:
LineEdit*lineedit;
};
#endif//MYWIDGET_H
/**********************The source file of the main window********************** *******/
#include"mywidget.h"
#include
MyWidget::MyWidget(QWidget*parent):
QWidget(parent)
{
lineedit=newLineEdit;
QHBoxLayout*hlayout=newQHBoxLayout;
hlayout->addWidget(lineedit);
setLayout(hlayout);
}
/**********************Display the source file of the main window********************* ********/
#include
#include
#include"mywidget.h"
intmain(intargc,char*argv[])
{
QApplicaTIonapp(argc,argv);
QTextCodec::setCodecForTr(QTextCodec::codecForName("GBK"));
MyWidget*mywidget=newMyWidget;
mywidget->show();
returnapp.exec();
}
The following is an effect after running:
Note: The above is only a test program, and has no practical application value. The specific application depends on the actual work requirements.
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