<Qt5 实战>No.02 简易软键盘 - 支持中文输入

一、Qt版本：Qt 5.9.3 (MSVC 2015, 32 bit)

二、局限性： 
1）只适用于QLineEdit，但可按需更改。
2）界面简单。只提供了中英文输入，数字输入，大小写转换，其它功能暂未实现。
3）ARM开发板上中文乱码。后续看情况调试更新。

更新日志：2018年01月18日更新，解决ARM开发板中文输入乱码。
更新代码在这里列出，下面的源代码就不改了。
（1）添加头文件：
#include <QTextCodec>
（2）在loadziku()函数（第99行）中：
①第110行 QString zikuAll; 代码行上面一行添加：
QTextCodec *codec = QTextCodec::codecForName("GBK");
②第121行 QString str = QString::fromLocal8Bit(buf); 改为：
QString str = codec->toUnicode(buf);

三、来一截图展示：



四、上代码：

1）头文件：keyboard.h
#ifndef KEYBOARD_H
#define KEYBOARD_H

#include <QDialog>

#include <QButtonGroup>
#include <QList>
#include <QLineEdit>

namespace Ui {
class KeyBoard;
}

class KeyBoard : public QDialog
{
Q_OBJECT

public:
explicit KeyBoard(QWidget *parent = 0, QLineEdit *LineEdit = 0);
~KeyBoard();
QString outputStr;

protected:
QString findChinese(QString PinYin);
void setHanziBt();

private slots:
void on_caps_Bt_clicked();
void slot_numClicked(QAbstractButton *bt);
void slot_carClicked(QAbstractButton *bt);
void slot_hanziBtClicked(QAbstractButton *bt);

void on_zh_us_Bt_clicked();
void on_delBt_clicked();
void on_nextBt_clicked();
void on_prevBt_clicked();
void on_closeBt_clicked();

private:
Ui::KeyBoard *ui;

bool isCap; // 大小写控制

QButtonGroup *carGroup;
QList<QAbstractButton *> carList;
QList<QAbstractButton *> zhList;

QStringList zikuList; // 字库一行一行分割

int pageAll; // 总页数
int curPage; // 当前页
QStringList pageList; // 查找出的字符串10个10个分割

QLineEdit *lineEdit;

void loadziku(); // 加载中文字库
};

#endif // KEYBOARD_H


2）cpp文件：keyboard.cpp
#include "keyboard.h"
#include "ui_keyboard.h"

#include <QDebug>
#include <QMessageBox>
#include <QFile>

KeyBoard::KeyBoard(QWidget *parent, QLineEdit *LineEdit) :
QDialog(parent),
ui(new Ui::KeyBoard)
{
ui->setupUi(this);

this->setWindowTitle( tr("键盘") );
// this->setWindowOpacity(0.8);
// this->setStyleSheet("");

isCap = false;
outputStr = "";
lineEdit = LineEdit;
pageAll = 0;
curPage = 0;

ui->nextBt->setEnabled(false);
ui->prevBt->setEnabled(false);

QButtonGroup *numGroup = new QButtonGroup();
numGroup->addButton(ui->num_0_Bt, 0);
numGroup->addButton(ui->num_1_Bt, 1);
numGroup->addButton(ui->num_2_Bt, 2);
numGroup->addButton(ui->num_3_Bt, 3);
numGroup->addButton(ui->num_4_Bt, 4);
numGroup->addButton(u
d2fc
i->num_5_Bt, 5);
numGroup->addButton(ui->num_6_Bt, 6);
numGroup->addButton(ui->num_7_Bt, 7);
numGroup->addButton(ui->num_8_Bt, 8);
numGroup->addButton(ui->num_9_Bt, 9);
connect( numGroup, SIGNAL(buttonClicked(QAbstractButton*)),
this, SLOT(slot_numClicked(QAbstractButton*)) );

QButtonGroup *carGroup = new QButtonGroup();
carGroup->addButton(ui->q_Bt, 1);
carGroup->addButton(ui->w_Bt, 2);
carGroup->addButton(ui->e_Bt, 3);
carGroup->addButton(ui->r_Bt, 4);
carGroup->addButton(ui->t_Bt, 5);
carGroup->addButton(ui->y_Bt, 6);
carGroup->addButton(ui->u_Bt, 7);
carGroup->addButton(ui->i_Bt, 8);
carGroup->addButton(ui->o_Bt, 9);
carGroup->addButton(ui->p_Bt, 10);
carGroup->addButton(ui->a_Bt, 11);
carGroup->addButton(ui->s_Bt, 12);
carGroup->addButton(ui->d_Bt, 13);
carGroup->addButton(ui->f_Bt, 14);
carGroup->addButton(ui->g_Bt, 15);
carGroup->addButton(ui->h_Bt, 16);
carGroup->addButton(ui->j_Bt, 17);
carGroup->addButton(ui->k_Bt, 18);
carGroup->addButton(ui->l_Bt, 19);
carGroup->addButton(ui->z_Bt, 20);
carGroup->addButton(ui->x_Bt, 21);
carGroup->addButton(ui->c_Bt, 22);
carGroup->addButton(ui->v_Bt, 23);
carGroup->addButton(ui->b_Bt, 24);
carGroup->addButton(ui->n_Bt, 25);
carGroup->addButton(ui->m_Bt, 26);
connect( carGroup, SIGNAL(buttonClicked(QAbstractButton*)),
this, SLOT(slot_carClicked(QAbstractButton*)) );
carList = carGroup->buttons();

QButtonGroup *hanziGroup = new QButtonGroup();
hanziGroup->addButton(ui->zh_1_Bt, 1);
hanziGroup->addButton(ui->zh_2_Bt, 2);
hanziGroup->addButton(ui->zh_3_Bt, 3);
hanziGroup->addButton(ui->zh_4_Bt, 4);
hanziGroup->addButton(ui->zh_5_Bt, 5);
hanziGroup->addButton(ui->zh_6_Bt, 6);
hanziGroup->addButton(ui->zh_7_Bt, 7);
hanziGroup->addButton(ui->zh_8_Bt, 8);
hanziGroup->addButton(ui->zh_9_Bt, 9);
hanziGroup->addButton(ui->zh_10_Bt, 10);
connect( hanziGroup, SIGNAL(buttonClicked(QAbstractButton*)),
this, SLOT(slot_hanziBtClicked(QAbstractButton*)));
zhList = hanziGroup->buttons();

// 加载字库
loadziku();

}

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

/* 加载字库 */
void KeyBoard::loadziku()
{
// 加载字库文件
QFile zikuFile(":/ziku1/ziku.dat");
if ( !zikuFile.open(QIODevice::ReadOnly | QIODevice::Text) )
{
QMessageBox::information(this, "键盘字库",
"加载字库文件错误，中文输入不可用！", QMessageBox::Ok);
ui->zh_us_Bt->setEnabled(false);
return;
}

QString zikuAll;

while (true)
{
char buf[1024];
qint64 len = zikuFile.readLine(buf, sizeof(buf));
if (len <= 0)
{
break;
}
QString str = QString::fromLocal8Bit(buf);
zikuAll += str;
}

zikuList = zikuAll.split("\n"); //用QString的split函数将字库文件划分成一段一段，每个拼音对应一段字库
zikuFile.close();
}

/* 查找中文 */
QString KeyBoard::findChinese(QString PinYin)
{
QStringList lst;
QString Line;
QString returnChinese;

for(int i = 0; i < zikuList.count(); i++)//m_srf.count()QStringList有多少段
{
Line = zikuList.at(i);
if (Line.isEmpty() || PinYin.isEmpty()) continue;

lst = Line.split(",");
if (QString::compare(lst.at(0), PinYin, Qt::CaseInsensitive) == 0)
{
returnChinese = lst.at(1);
}
}

// 字符串分割成10个10个一组
pageList.clear();
int len = returnChinese.length();
if (len > 0)
{
pageAll = len % 10 == 0 ? len/10 : (len/10) + 1;
QString str;
for (int i = 1; i <= len; i++)
{
str += returnChinese.at(i-1);
if (i % 10 == 0 && i != 0)
{
pageList << str;
str = "";
}
}

if (len % 10 != 0)
{
pageList << returnChinese.right(len % 10);
}
}//if

return returnChinese;
}

/* 汉字按钮的设置 */
void KeyBoard::setHanziBt()
{

for (int i = 0; i < 10; i++)
{
zhList.at(i)->setText("");
}

QString PinYin = ui->showLb->text();
QString ChineseStr = findChinese(PinYin);

ui->nextBt->setEnabled(false);
ui->prevBt->setEnabled(false);

if (ChineseStr != "")
{
int ChineseStrCount = ChineseStr.length();
// 10字以内汉字个数
if (ChineseStrCount <= 10)
{
for (int i = 0; i < ChineseStrCount; i++)
{
((QPushButton *)zhList.at(i))->setText(ChineseStr.at(i));
}
return;
}

// 大于十字
for (int i = 0; i < 10; i++)
{
((QPushButton *)zhList.at(i))->setText(ChineseStr.at(i));
}

ui->nextBt->setEnabled(true);
ui->prevBt->setEnabled(true);

}//if
}

/* 大小写转换 */
void KeyBoard::on_caps_Bt_clicked()
{
if (isCap == false) // 小写状态
{
for (int i = 0; i < carList.size(); i++)
{
QString upper = carList.at(i)->text().toUpper();
carList.at(i)->setText(upper);
}
isCap = true;
return;
}
else // 大写状态
{
for (int i = 0; i < carList.size(); i++)
{
QString lower = carList.at(i)->text().toLower();
carList.at(i)->setText(lower);
}
isCap = false;
return;
}
}

/* 数字键盘点击 */
void KeyBoard::slot_numClicked(QAbstractButton *bt)
{
QPushButton *tmpBt = (QPushButton *)bt;
QString str = lineEdit->text();
str.append(tmpBt->text());
lineEdit->setText(str);
}

/* 字母键点击 */
void KeyBoard::slot_carClicked(QAbstractButton *bt)
{
QPushButton *tmp = (QPushButton *)bt;
QString str_1 = ui->showLb->text();
str_1.append(tmp->text());
ui->showLb->setText(str_1);

if (ui->langLb->text() == "英文")
{
QString str_2 = lineEdit->text();
str_2.append(tmp->text());
lineEdit->setText(str_2);
}
else
{
setHanziBt();
}
}

/* 十个中文按钮点击 */
void KeyBoard::slot_hanziBtClicked(QAbstractButton *bt)
{
QPushButton *tmp = (QPushButton *)bt;
QString str = lineEdit->text();
str.append(tmp->text());
lineEdit->setText(str);
ui->showLb->setText("");
for (int i = 0; i < 10; i++)
{
zhList.at(i)->setText("");
}

ui->nextBt->setEnabled(false);
ui->prevBt->setEnabled(false);
}

/* 中英切换按钮 */
void KeyBoard::on_zh_us_Bt_clicked()
{
if (ui->langLb->text() == "英文")
{
ui->langLb->setText("中文");
ui->showLb->setText("");
}
else
{
ui->langLb->setText("英文");
ui->showLb->setText("");
}
}

/* 退格键 */
void KeyBoard::on_delBt_clicked()
{
QString tmp = ui->showLb->text();
ui->showLb->setText(tmp.left(tmp.length() - 1));

if (ui->langLb->text() == "英文")
{
QString str = lineEdit->text();
lineEdit->setText(str.left(str.length() - 1));
}
else
{
for (int i = 0; i < 10; i++)
{
zhList.at(i)->setText("");
}
setHanziBt();
if (ui->showLb->text() == "") // 中文模式下，showLb中删除完毕才去删除LineEdit里的文字
{
QString str = lineEdit->text();
lineEdit->setText(str.left(str.length() - 1));
}
}
}

/* 翻页按键 */
void KeyBoard::on_nextBt_clicked()
{
curPage++;

if (curPage > pageAll)
{
curPage = 1;
}

for (int i = 0; i < 10; i++)
{
zhList.at(i)->setText("");
}

QString str = pageList.at(curPage-1);
qDebug() << str;
for (int i = 0; i < str.length(); i++)
{
zhList.at(i)->setText(str.at(i));
}
}

void KeyBoard::on_prevBt_clicked()
{
curPage--;
if (curPage == 0)
{
curPage = pageAll;
}

for (int i = 0; i < 10; i++)
{
zhList.at(i)->setText("");
}

QString str = pageList.at(curPage-1);
for (int i = 0; i < str.length(); i++)
{
zhList.at(i)->setText(str.at(i));
}
}

void KeyBoard::on_closeBt_clicked()
{
this->close();
}


演示代码下载：http://download.csdn.net/download/wu9797/10197538