Qt数字键盘（二）

上次本来想着直接在页面中拖几个键做键盘用，简单又好用，后来发现复用性太低，而且只能对其中一个lineEdit进行数字输入，太死板，还是得用软件盘，一点输入框就出来的那种。还是根据嵌入式QT软键盘那个程序改了一下，只留下了数字键。

1.写一个My_lineEdit的类，继承QLineEdit，重写鼠标点击事件，点击输入框可以发送一个send_show信号，以便于主界面接收显示软键盘。程序如下：

#ifndef MY_LINEEDIT_H
#define MY_LINEEDIT_H
#include <QWidget>
#include <QLineEdit>

class My_lineEdit : public QLineEdit
{
    Q_OBJECT
public:
    My_lineEdit(QWidget *parent = 0);

protected:
    void mousePressEvent(QMouseEvent *event);

signals:
    void send_show(QString data);

};

#endif // MY_LINEEDIT_H

#include "my_lineedit.h"

My_lineEdit::My_lineEdit(QWidget *parent) :
    QLineEdit(parent)
{
    this->setText("521");
}

void My_lineEdit::mousePressEvent(QMouseEvent *event)
{
    emit send_show(this->text());
    QLineEdit::mousePressEvent(event);
}

2.写一个包含界面ui文件的键盘类，在键盘上按顺序拖入需要的键，和输入框lineEdit，注意一定要按顺序从左到右，从上到下，这样才能保证按键序列相对应，拖完按键可以点击Tab键看看焦点是不是按顺序移动。这是为键盘响应按钮点击做准备。

#ifndef MYKEYDIALOG_H
#define MYKEYDIALOG_H

#include <QDialog>
#include "ui_mykeydialog.h"
#include <QKeyEvent>

class MyKeyDialog : public QDialog,public Ui::MyKeyDialog
{
    Q_OBJECT
public:
     MyKeyDialog();
    ~MyKeyDialog();
     void affirmString();
     void deleteString();
     void initGb();
public slots:
    void buttonClickResponse(int gemfield);
signals:
    void sendMessage(QString gemfield);
private:
    Ui::MyKeyDialog *ui;
    QKeyEvent *event;
    QButtonGroup *button_group;
    QVector<QPushButton*> button_vector;
};

#endif // MYKEYDIALOG_H

#include "mykeydialog.h"

QString number[12]={"0","1","2","3","4","5","6","7","8","9","."};
MyKeyDialog::MyKeyDialog() :
    QDialog(0,Qt::Tool | Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint),button_group(new QButtonGroup(this))
{
    setupUi(this);
    initGb ();
}

MyKeyDialog::~MyKeyDialog()
{
    //delete ui;
}

void MyKeyDialog::initGb()
{
    QPushButton *pushButton=new QPushButton(this);          //创建一个按钮对象
    pushButton->hide();                                     //按钮隐藏起来
    pushButton=pushButton_ok;
    for(int i=1;i<14;i++)
    {
        pushButton->setAutoFillBackground(true);
        pushButton->setFocusPolicy(Qt::NoFocus);
        button_vector.push_back(pushButton);      //按钮集合，push_back（）往按钮集合中添加一个按钮
        button_group->addButton(pushButton,i);    //添加一个按钮到button_group中，并且给按钮编号
        pushButton=qobject_cast<QPushButton *>(pushButton->nextInFocusChain());     //焦点指向下一个button
    }
    connect(button_group,SIGNAL(buttonClicked(int)),SLOT(buttonClickResponse(int)));
}
void MyKeyDialog::buttonClickResponse(int gemfield)
{
    if(gemfield==1)
    {
        affirmString ();
        return;
    }
    else if(gemfield==13)
    {
        deleteString ();
        return;
    }
    else
    {
        event=new QKeyEvent(QEvent::KeyPress, 0, Qt::NoModifier,number[gemfield-2]);
    }
     lineEdit_window->setFocus();
     QApplication::sendEvent(focusWidget(),event);
}
void MyKeyDialog::affirmString()
{
    emit sendMessage(lineEdit_window->text());               //发送信号给界面
    this->hide();
}
void MyKeyDialog::deleteString ()
{
    event=new QKeyEvent(QEvent::KeyPress, Qt::Key_Backspace, Qt::NoModifier);       //新建一个键盘事件
    lineEdit_window->setFocus();
    QApplication::sendEvent(focusWidget(),event);
}

3.添加一个Qt Designer Form Class ，在ui界面上拖入一个lineEdit部件（用程序在界面中也添加了一个lineedit部件），然后提升为My_lineEdit类，在头文件中包含mylineedit.h文件，原本的程序仅对一个部件设置了软件盘事件，添加lineEdit后输入数据总是在第一个lineedit那里，我稍作修改，添加了一个判断sender（）的命令，来判断软件盘的调用者。

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <my_lineedit.h>
#include "mykeydialog.h"
#include <QKeyEvent>
namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

public slots:
    void show_numberkeyboard_ui(QString data);     //显示键盘
    void confirmString(QString gemfield);   //接收键盘发过来的数据
private:
    Ui::Widget *ui;
    QLineEdit *m_edit;
    MyKeyDialog *numberkeyboard;
    QKeyEvent *event;
    QString lineEdit_object;//判断哪个lineedit调用了软件盘
};

#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    m_edit = new My_lineEdit(this);
    m_edit->setObjectName("lineEdit0");
    m_edit->setGeometry(10,10,200,20);

    numberkeyboard = new MyKeyDialog();
//将所有lineedit信号都和软件盘界面显示关联
    connect(m_edit,SIGNAL(send_show(QString)),this,SLOT(show_numberkeyboard_ui(QString)));
    connect(ui->lineEdit1,SIGNAL(send_show(QString)),this,SLOT(show_numberkeyboard_ui(QString)));

    connect(numberkeyboard,SIGNAL(sendMessage(QString)),this,SLOT(confirmString(QString)));
}

Widget::~Widget()
{
    delete ui;
}
void Widget::show_numberkeyboard_ui(QString data){
    lineEdit_object = sender()->objectName();//获得调用软件盘的部件的名称
    numberkeyboard->lineEdit_window->setText(data);
    //numberkeyboard->resize(400,300);
    //numberkeyboard->move(200,170);
    numberkeyboard->show();
}
void Widget::confirmString(QString gemfield){
//判断应该将信息写入哪一个输入框
    if(lineEdit_object==ui->lineEdit1->objectName())
        ui->lineEdit1->setText(gemfield);
    else
        m_edit->setText(gemfield);
}

Qt数字键盘（二）

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