Qt开发-数字软键盘

最近项目做触屏界面，需要使用到数字软键盘。

参考了以下内容：

Qt实战开发-数字软键盘：https://blog.csdn.net/Osean_li/article/details/60882890

syszuxpinyin代码：https://github.com/CivilNet/syszuxpinyin

结合我自己项目的需要，优化了以下几点内容：

使用layout布局替换原有的坐标布局。

使用button group按钮组来传递slot，避免写重复了SLOT。

去掉font的定义，方便使用外部的QSS定义样式。

去掉了编辑的时候的判断，可以任意输入字符。

先上效果图：

这样基本能满足数字和小数点的输入了，如果需要其他字符的输入，就需要查找其他的软键盘方案了。

代码如下：

softkeylineedit.h

#ifndef SOFTKEYLINEEDIT_H
#define SOFTKEYLINEEDIT_H#include <QLineEdit>
#include <QMouseEvent>
#include "numkeyboard.h"class SoftKeyLineEdit : public QLineEdit
{Q_OBJECT
public:explicit SoftKeyLineEdit(QWidget *parent = 0);protected:void mousePressEvent(QMouseEvent *e);private:NumKeyboard *numkeyboard;signals:public slots:};#endif // SOFTKEYLINEEDIT_H

softkeylineedit.cpp

#include "softkeylineedit.h"SoftKeyLineEdit::SoftKeyLineEdit(QWidget *parent) :QLineEdit(parent)
{numkeyboard = new NumKeyboard(this);
}void SoftKeyLineEdit::mousePressEvent(QMouseEvent *e)
{if(e->button() == Qt::LeftButton){numkeyboard->setWindowFlags(Qt::Dialog | Qt::FramelessWindowHint);numkeyboard->setStyleSheet("border:2px solid white;");numkeyboard->setText(this->text());  //当前的文本框的内容，this->指向的是SoftKeyLineEdit        numkeyboard->exec();if(numkeyboard->valid){this->setText(numkeyboard->getText());  //此处的setText是继承QLineEdit的，numkeyboard->setTex是自定义的，目的是获取当前的文本}}
}

numkeyboard.h

#ifndef NUMKEYBOARD_H
#define NUMKEYBOARD_H#include <QDialog>
#include <QtDebug>
#include <QKeyEvent>
#include <QEvent>
#include <QLineEdit>
#include <QPushButton>class NumKeyboard : public QDialog
{Q_OBJECTpublic:explicit NumKeyboard(QWidget *parent = 0);~NumKeyboard();bool valid;void setText(QString str);QString getText();QPushButton *num6Button;QPushButton *backspaceButton;QPushButton *num4Button;QPushButton *okButton;QPushButton *leftButton;QPushButton *num1Button;QPushButton *cancelButton;QPushButton *rightButton;QPushButton *num9Button;QPushButton *num8Button;QPushButton *num2Button;QPushButton *num7Button;QPushButton *dotButton;QPushButton *num3Button;QPushButton *num0Button;QPushButton *num5Button;QPushButton *signButton;QLineEdit *lineEdit;protected:void changeEvent(QEvent *e);
//    void keyPressEvent(QKeyEvent *e);bool eventFilter(QObject *obj, QEvent *event);private slots:void buttonClickResponse(int gemfield);private:QString strContent;
};#endif // NUMKEYBOARD_H

numkeyboard.h

#include "numkeyboard.h"
#include <QDebug>
#include <QGridLayout>
#include <QButtonGroup>QString st_letter[11]={"0","1","2","3","4","5","6","7","8","9","."};NumKeyboard::NumKeyboard(QWidget *parent) :QDialog(parent)
{QGridLayout *layout = new QGridLayout();QButtonGroup *button_group = new QButtonGroup(this);okButton = new QPushButton(this);okButton->setText("确定");button_group->addButton(okButton,15);layout->addWidget(okButton,4,3,1,2);backspaceButton = new QPushButton(this);backspaceButton->setText("<<");button_group->addButton(backspaceButton,12);layout->addWidget(backspaceButton,2,3,1,2);num6Button = new QPushButton(this);num6Button->setText("6");button_group->addButton(num6Button,6);layout->addWidget(num6Button,2,2,1,1);num4Button = new QPushButton(this);num4Button->setText("4");button_group->addButton(num4Button,4);layout->addWidget(num4Button,2,0,1,1);leftButton = new QPushButton(this);leftButton->setText("<-");button_group->addButton(leftButton,13);layout->addWidget(leftButton,3,3,1,1);num1Button = new QPushButton(this);num1Button->setText("1");button_group->addButton(num1Button,1);layout->addWidget(num1Button,1,0,1,1);cancelButton = new QPushButton(this);cancelButton->setText("取消");button_group->addButton(cancelButton,11);layout->addWidget(cancelButton,1,3,1,2);rightButton = new QPushButton(this);rightButton->setText("->");button_group->addButton(rightButton,14);layout->addWidget(rightButton,3,4,1,1);num9Button = new QPushButton(this);num9Button->setText("9");button_group->addButton(num9Button,9);layout->addWidget(num9Button,3,2,1,1);num8Button = new QPushButton(this);num8Button->setText("8");button_group->addButton(num8Button,8);layout->addWidget(num8Button,3,1,1,1);num2Button = new QPushButton(this);num2Button->setText("2");button_group->addButton(num2Button,2);layout->addWidget(num2Button,1,1,1,1);num7Button = new QPushButton(this);num7Button->setText("7");button_group->addButton(num7Button,7);layout->addWidget(num7Button,3,0,1,1);dotButton = new QPushButton(this);dotButton->setText(".");button_group->addButton(dotButton,10);layout->addWidget(dotButton,4,2,1,1);num3Button = new QPushButton(this);num3Button->setText("3");button_group->addButton(num3Button,3);layout->addWidget(num3Button,1,2,1,1);num0Button = new QPushButton(this);num0Button->setText("0");button_group->addButton(num0Button,0);layout->addWidget(num0Button,4,0,1,2);num5Button = new QPushButton(this);num5Button->setText("5");button_group->addButton(num5Button,5);layout->addWidget(num5Button,2,1,1,1);lineEdit = new QLineEdit(this);lineEdit->setText(QString());layout->addWidget(lineEdit,0,0,1,5);//连接button_group的点击信号，和本对象的buttonClickResponse函数，传递参数为按钮号connect(button_group,SIGNAL(buttonClicked(int)),SLOT(buttonClickResponse(int)));//为所有按钮控件添加objectName，提供给QSS样式使用QList<QPushButton*> btnList = this->findChildren<QPushButton*>();for(int i = 0; i < btnList.size(); i++){QPushButton* btn = btnList.at(i);btn->setObjectName("keyboard");}setLayout(layout);
}NumKeyboard::~NumKeyboard()
{}void NumKeyboard::changeEvent(QEvent *e)
{QDialog::changeEvent(e);switch (e->type()) {case QEvent::LanguageChange:break;default:break;}
}bool NumKeyboard::eventFilter(QObject *obj, QEvent *event)
{if (event->type() == QEvent::KeyPress){QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);if (obj == lineEdit){if(keyEvent->key() >= 0x20 && keyEvent->key()<= 0x0ff)  //屏蔽所有按键输入return true;elsereturn false;}else{return false;}}else{// standard event processingreturn QObject::eventFilter(obj, event);}
}//***********************按键*****************************//
void NumKeyboard::buttonClickResponse(int gemfield)        //
{if( gemfield >=0 && gemfield <= 10){int idx = lineEdit->cursorPosition();  //光标的位置索引//  字符串的存储有引用计数，当一个 QString 对象被复制为另一个 QString 对象时，它们实际上指向相同的存储空间，仅仅是增加一个引用计数strContent.insert(idx, st_letter[gemfield]);  //插入字符串str在给定的索引位置对这个字符串,并返回一个引用。 //数据存入strContentlineEdit->setText(strContent); //strContent中的内容显示在lineEditlineEdit->setCursorPosition(idx+1); //设置光标的位置 ??不设置好像也可以使用设定光标的位置lineEdit->setFocus();  //存在光标qDebug()<<"strContent"<<strContent;qDebug()<<"idx"<<idx;}else if( gemfield == 13)//<-{int idx = lineEdit->cursorPosition();if(idx == 0){lineEdit->setCursorPosition(idx);lineEdit->setFocus();return;}lineEdit->setCursorPosition(idx-1);lineEdit->setFocus();}else if( gemfield == 14)//->{int idx = lineEdit->cursorPosition();if(idx == strContent.length()) //返回此字符串的字符数{lineEdit->setCursorPosition(idx);lineEdit->setFocus();return;}lineEdit->setCursorPosition(idx+1);lineEdit->setFocus();}else if( gemfield == 12)//<<{int idx = lineEdit->cursorPosition();if(idx == 0){lineEdit->setCursorPosition(idx);lineEdit->setFocus();return;}strContent.remove(idx-1,1);lineEdit->setText(strContent);lineEdit->setCursorPosition(idx-1);lineEdit->setFocus();}else if( gemfield == 11)//ESC{this->close();valid = false;}else if( gemfield == 15)//OK{this->close();valid = true;}
}void NumKeyboard::setText(QString str)      //设置文本内容
{strContent = str;lineEdit->setText(strContent);
}QString NumKeyboard::getText()              //获取内容
{return strContent;
}

将上面四个文件添加到工程中编译。使用方法如下：

SoftKeyLineEdit *pEdit_test = new SoftKeyLineEdit();
pEdit_test->setText("123456");

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Qt开发-数字软键盘

这样基本能满足数字和小数点的输入了，如果需要其他字符的输入，就需要查找其他的软键盘方案了。

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