Qt 软键盘[模拟]之键盘触发事件

1、打开Qt Creater软件，在'File'菜单中选择'New File or Project..'选项,弹出的对话框如下所示：

      

     2、选择 Qt C++ Project -->Qt Gui Project ，然后单击'Choose..'，进入下面的界面后，Base Class选择QWidget，然后单击 Next :

       

     3、进入下面的界面，输入Name ，单击 Next ，再单击 Finished 即可：

      

     4 、双击左侧树状菜单里的QWidget.ui，

      
     5、计入界面设计，设计如下：

         (这是程序运行之后的效果)  

     其中，按钮的objectName都重新设置，如下所示：

      

     6、双击树状菜单中的QWidget.h，编写头文件如下：    

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QDebug> 
#include<QKeyEvent>
#include <QList>
#include <QPushButton>
#include <QStyle>
namespace Ui {
	class Widget;
	}
class Widget : public QWidget
{
		Q_OBJECT
	public:
		explicit Widget(QWidget *parent = 0);
		~Widget();
	protected：
		void keyPressEvent(QKeyEvent *k);
	private:
		Ui::Widget *ui;
		QList<QPushButton*> list;
		QList<QPushButton*>::iterator i;
	private slots:
        void init(); //初始化
        QList<QPushButton*> uniteAllBtn(); //将所有按钮放到List中             
		void upKeyEvent(QPushButton*);
		void getBtnFocus(int num);
        void zeroBtnClicked();
        void oneBtnClicked();
        void twoBtnClicked();
        void threeBtnClicked();
        void fourBtnClicked();
        void fiveBtnClicked();
        void sixBtnClicked();
        void sevenBtnClicked();
        void eightBtnClicked();
        void nineBtnClicked();
        void backBtnClicked();
        void clearClicked();                //键盘上下键事件
        void keyUp();
        void keyDown();
        void keyLeft();
        void keyRight();
        };
#endif // WIDGET_H

    7、widget.cpp

//----------------------------------------------------
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
	ui->setupUi(this);
	this->init();
	list = this->uniteAllBtn();
}
Widget::~Widget()
{
	delete ui;
}
//初始化槽函数
void Widget::init()
{
	connect(ui->zeroBtn,SIGNAL(clicked()),this,SLOT(zeroBtnClicked()));
	connect(ui->oneBtn,SIGNAL(clicked()), this,SLOT(oneBtnClicked()));
	connect(ui->twoBtn,SIGNAL(clicked()),this,SLOT(twoBtnClicked()));
	connect(ui->threeBtn,SIGNAL(clicked()),this,SLOT(threeBtnClicked()));
	connect(ui->fourBtn,SIGNAL(clicked()),this,SLOT(fourBtnClicked()));
	connect(ui->fiveBtn,SIGNAL(clicked()),this,SLOT(fiveBtnClicked()));
	connect(ui->sixBtn,SIGNAL(clicked()),this,SLOT(sixBtnClicked()));
	connect(ui->sevenBtn,SIGNAL(clicked()),this,SLOT(sevenBtnClicked()));
	connect(ui->eightBtn,SIGNAL(clicked()),this,SLOT(eightBtnClicked()));
	connect(ui->nineBtn,SIGNAL(clicked()),this,SLOT(nineBtnClicked()));
	connect(ui->backBtn,SIGNAL(clicked()),this,SLOT(backBtnClicked()));
	connect(ui->clearBtn,SIGNAL(clicked()),this,SLOT(clearClicked()));
}
//将所有按钮装入一个Qlist中
QList<QPushButton*> Widget::uniteAllBtn()
{
	QList<QPushButton*> list;
	list.append(ui->zeroBtn);
	list.append(ui->oneBtn);
	list.append(ui->twoBtn);
	list.append(ui->threeBtn);
	list.append(ui->fourBtn);
	list.append(ui->fiveBtn);
	list.append(ui->sixBtn);
	list.append(ui->sevenBtn);
	list.append(ui->eightBtn);
	list.append(ui->nineBtn);
	list.append(ui->backBtn);
	list.append(ui->clearBtn);
	return list;
}
//单击‘0’按钮触发的事件
void Widget::zeroBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"0");
	getBtnFocus(0);
	ui->zeroBtn->setStyleSheet("QPushButton:pressed{background-color:
	rgb(255, 55,15);}");
}
//单击‘1’按钮
void Widget::oneBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"1");
	getBtnFocus(1);
}
//单击'2'按钮
void Widget::twoBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"2");
	getBtnFocus(2);
}
//单机'3'按钮
void Widget::threeBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"3");
	getBtnFocus(3);
}
//4
void Widget::fourBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"4");
	getBtnFocus(4);
}
//5
void Widget::fiveBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"5");
	getBtnFocus(5);
}
//6
void Widget::sixBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"6");
	getBtnFocus(6);
}
//7
void Widget::sevenBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"7");
	getBtnFocus(7);
}
//8
void Widget::eightBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"8");
	getBtnFocus(8);
}
//9
void Widget::nineBtnClicked()
{
	ui->lineEdit->setText(ui->lineEdit->text()+"9");
	getBtnFocus(9);
}
//退格键
void Widget::backBtnClicked()
{
	QString s = ui->lineEdit->text();
	int len = s.length();
	QString s2 = s.remove(len-1,1);
	qDebug()<<s2;
	ui->lineEdit->setText(s2);
	getBtnFocus(10);
}
//清空
void Widget::clearClicked()
{
	getBtnFocus(11);
	ui->lineEdit->setText("");
}
//获取焦点
void Widget::getBtnFocus(int num)
{
	int j=0; //用来判断list中的第几个按钮
	for(i=list.begin(); i!=list.end(); ++i)
	{
		QPushButton *btn = *i;
		if(num == j)
		{
			btn->setFocus();
			btn->setStyleSheet("background-color: rgb(255, 55, 15);");
		}
		else
		{
			btn->clearFocus();
		}
		j++;
	}
}
//键盘事件
void Widget::keyPressEvent(QKeyEvent *k)
{
	switch(k->key()){
		case Qt::Key_8:
			keyUp();break;
		case Qt::Key_2:
			keyDown();break;
		case Qt::Key_4:
			keyLeft();break;
		case Qt::Key_6:
			keyRight();break;
}
}
//按键盘的上键触发的事件
void Widget::keyUp()
{
	int j=0; //判断是否到最后一个
	for(i=list.begin(); i!=list.end(); ++i)
	{
		// qDebug() << list.size();
		QPushButton *btn = *i;
		if(btn->hasFocus())
		{
			btn->clearFocus();
			if(j<list.size()-1)
			{
				QPushButton *btn1 = *(++i);
				btn1->setFocus();
			}
			else
			{ //当焦点到list最后一个时
				QPushButton *btn1 = *(list.begin());
				btn1->setFocus();
			}
		}
		j++;
	}
}
void Widget::keyDown()
{
	int j=0; //判断是否到最后一个
	for(i=list.begin(); i!=list.end(); ++i)
	{
		if(btn->hasFocus())
		{
			btn->clearFocus();
			if(j==0)
			{ //当焦点到list第一个时
				QPushButton *btn2 = *(--list.end());
				qDebug()<<btn2->objectName();
				btn2->setFocus();
			}
			else
			{
				QPushButton *btn1 = *(--i);
				btn1->setFocus();
			}
		}
		j++;
	}
}
void Widget::keyLeft()
{
	keyUp();
}
void Widget::keyRight()
{
	keyUp();
}

8、main.cpp不用做修改

#include <QtGui/QApplication>
#include "widget.h"
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	Widget w;
	w.show();
	return a.exec();
}