QT 软键盘

1.需要做如下的界面

2. .h文件

#ifndef KEYBOARD_H
#define KEYBOARD_H

#include <QWidget>
#include <QMessageBox>
#include <QList>
#include <QToolButton>
#include <QSignalMapper>
#include <QKeyEvent>
namespace Ui {
class keyBoard;
}

class keyBoard : public QWidget
{
    Q_OBJECT

public:
    explicit keyBoard(QWidget *parent = 0);
    ~keyBoard();
    QString lineText;                //编辑的内容
    void lineSetFocus();             //光标的位置
private:
       QWidget *m_pParent;
       int i;
       QSignalMapper *signalMapper;
       QList<QToolButton *> allButtons;
private slots:
       void on_btnClear_clicked();                 //清除按键
       void on_btnHide_clicked();                  //取消按键
       void on_btnEnter_clicked();                 //确定按键
       void toolButton(int btn);                   //所有按键
private:
    Ui::keyBoard *ui;
};

#endif // KEYBOARD_H

3. .cpp文件

#include "keyboard.h"
#include "ui_keyboard.h"
#include <QDebug>
keyBoard::keyBoard(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::keyBoard)
{
    ui->setupUi(this);
    m_pParent = parent;
    signalMapper = new QSignalMapper(this);
    allButtons = findChildren<QToolButton *>();
    for( i=0;i<allButtons.count();i++) {
     //signalMapper多信号跟同一槽链接
        connect(allButtons.at(i), SIGNAL(clicked()), signalMapper, SLOT(map()));
        signalMapper->setMapping(allButtons.at(i), i);
    }
    connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(toolButton(int)));
}

keyBoard::~keyBoard()
{
    delete ui;
}

void keyBoard::lineSetFocus() //设置光标
{
    ui->lineEdit->setFocus();

}

void keyBoard::toolButton(int btn){
      QString strKeyId;
      strKeyId = allButtons.at(btn)->accessibleName(); //获取按钮的属性标识
      bool isOk;
      int keyId = strKeyId.toInt(&isOk, 16); //将16进制转化成10进制
      if (strKeyId.isEmpty() || !isOk) {
          return;
      }
    int involvedKeys = 1;
    Qt::KeyboardModifiers Modifier = Qt::NoModifier;
    QString ch = allButtons.at(btn)->text().trimmed();
    if (keyId==Qt::Key_Space){
        ch = " ";
    }
    //描述键盘按键所产生的QT事件
    //参数type必须是QEvent::KeyPress, QEvent::KeyRelease, or QEvent::ShortcutOverride
    QKeyEvent keyEvent(QEvent::KeyPress, keyId, Modifier, ch, false, involvedKeys);
    QApplication::sendEvent(this->focusWidget(),&keyEvent);
}

void keyBoard::on_btnEnter_clicked() //确定并返回键
{
   lineText=ui->lineEdit->text();
   this->hide();
}

void keyBoard::on_btnHide_clicked() //取消键
{
    this->hide();
}

void keyBoard::on_btnClear_clicked() //清除键
{
    ui->lineEdit->setText("");
}