QT实现中英文键盘

使用Qt中实现中英文键盘，支持各种linux嵌入式设备。
实现思路：需要一个中文字体库，将字体库加载到一个Hash容器，字母和拼音作为key值，对应的中文作为value值。
核心代码：

#include "UKeyBoard.h"
#include "ui_UKeyBoard.h"
#include <QFile>
#include <QKeyEvent>
#include <QDebug>UKeyBoard::UKeyBoard(QWidget *parent) :QWidget(parent),ui(new Ui::UKeyBoard)
{ui->setupUi(this);QFile* file = new QFile(QApplication::applicationDirPath()+"/PinYin_Chinese.txt");file->open(QIODevice::ReadOnly);QString sss = QString::fromUtf8(file->readAll());qDebug()<<sss.size();QStringList ssslist = sss.split("\r\n");foreach (QString var, ssslist) {QStringList pinyin = var.mid(1,var.size() - 1).split(" ");QString word = var.mid(0,1);for (int i = 0; i < pinyin.size(); ++i) {if (m_wordHash.find(pinyin[i]) == m_wordHash.end())m_wordHash.insert(pinyin[i],QStringList()<<word);elsem_wordHash[pinyin[i]].append(word);}}connectInit();
}UKeyBoard::~UKeyBoard()
{delete ui;
}void UKeyBoard::connectInit()
{connect(ui->Key_Q_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_W_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_E_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_R_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_T_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_Y_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_U_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_I_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_O_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_P_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_A_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_S_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_D_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_F_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_G_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_H_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_J_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_K_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_L_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_Z_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_X_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_C_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_V_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_B_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_N_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->Key_M_Btn,&QToolButton::clicked,this,&UKeyBoard::slotKeyBtn);connect(ui->wordBtn1,&QToolButton::clicked,this,&UKeyBoard::slotInputChange);connect(ui->wordBtn2,&QToolButton::clicked,this,&UKeyBoard::slotInputChange);connect(ui->wordBtn3,&QToolButton::clicked,this,&UKeyBoard::slotInputChange);connect(ui->wordBtn4,&QToolButton::clicked,this,&UKeyBoard::slotInputChange);connect(ui->wordBtn5,&QToolButton::clicked,this,&UKeyBoard::slotInputChange);connect(ui->wordBtn6,&QToolButton::clicked,this,&UKeyBoard::slotInputChange);connect(ui->wordBtn7,&QToolButton::clicked,this,&UKeyBoard::slotInputChange);
}
//输入中文
void UKeyBoard::slotInputChange()
{QToolButton* btn = (QToolButton*)sender();QString value = btn->text();QKeyEvent *key = new QKeyEvent(QEvent::KeyPress, 'w', Qt::NoModifier, value.split(" ").last());//通过postEvent将事件key的文本内容发送出去，QApplication::focusWidget()当前窗口中，有光标的控件上QApplication::postEvent(ui->inputEdit->focusWidget(), key); //_currentLineEditm_curWords.clear();ui->selectWordEdit->setText("");ui->selectWordEdit->hide();ui->wordBtn1->setText("");ui->wordBtn2->setText("");ui->wordBtn3->setText("");ui->wordBtn4->setText("");ui->wordBtn5->setText("");ui->wordBtn6->setText("");ui->wordBtn7->setText("");
}
//上一页中文
void UKeyBoard::on_lastPageBtn_clicked()
{if (_index > 0)_index--;QString val = ui->selectWordEdit->text();wordChange(val,_index);
}
//下一页中文
void UKeyBoard::on_nextPageBtn_clicked()
{_index++;QString val = ui->selectWordEdit->text();if (wordChange(val,_index) < 0)_index--;
}
//按键输入
void UKeyBoard::slotKeyBtn()
{QToolButton* btn = (QToolButton*)sender();ui->inputEdit->setFocus();if (_keyType == 0){QString val = ui->selectWordEdit->text();int position = ui->selectWordEdit->cursorPosition();val.insert(position,btn->text());ui->selectWordEdit->setText(val);m_curWords.clear();m_curWords.append(m_wordHash.value(val));for (QHash<QString,QStringList>::const_iterator it = m_wordHash.begin(); it != m_wordHash.end();it++) {if (it.key().indexOf(val) == 0){if (it.key() == val)continue;m_curWords.append(it.value());}}wordChange(val,0);updateSelectInputPos();}else{QString value = btn->text();QKeyEvent *key = new QKeyEvent(QEvent::KeyPress, 'w', Qt::NoModifier, value);//通过postEvent将事件key的文本内容发送出去，QApplication::focusWidget()当前窗口中，有光标的控件上QApplication::postEvent(ui->inputEdit->focusWidget(), key); //_currentLineEdit}}
//更新编辑框大小和状态
void UKeyBoard::updateSelectInputPos()
{if (!ui->selectWordEdit->text().isEmpty()){ui->selectWordEdit->setFocus();ui->selectWordEdit->show();QFontMetrics _metrics(ui->inputEdit->font());QFontMetrics _metrics1(ui->selectWordEdit->font());QString inputVal = ui->inputEdit->text().mid(0,ui->inputEdit->cursorPosition());int inputPos = 5+_metrics.width(inputVal)+ui->inputEdit->x();ui->selectWordEdit->setGeometry(inputPos,ui->inputEdit->y()+3,_metrics1.width(ui->selectWordEdit->text())+6,36);}else{ui->inputEdit->setFocus();ui->selectWordEdit->clear();ui->selectWordEdit->hide();}
}
//中文检索
int UKeyBoard::wordChange(QString val,int index)
{_index = index;if (m_curWords.size() < 7*index)return -1;ui->wordBtn1->setText("");ui->wordBtn2->setText("");ui->wordBtn3->setText("");ui->wordBtn4->setText("");ui->wordBtn5->setText("");ui->wordBtn6->setText("");ui->wordBtn7->setText("");if (m_curWords.size()>7*index)ui->wordBtn1->setText("1 "+m_curWords[7*index]);if (m_curWords.size()>7*index+1)ui->wordBtn2->setText("2 "+m_curWords[7*index+1]);if (m_curWords.size()>7*index+2)ui->wordBtn3->setText("3 "+m_curWords[7*index+2]);if (m_curWords.size()>7*index+3)ui->wordBtn4->setText("4 "+m_curWords[7*index+3]);if (m_curWords.size()>7*index+4)ui->wordBtn5->setText("5 "+m_curWords[7*index+4]);if (m_curWords.size()>7*index+5)ui->wordBtn6->setText("6 "+m_curWords[7*index+5]);if (m_curWords.size()>7*index+6)ui->wordBtn7->setText("7 "+m_curWords[7*index+6]);return 0;
}
//大小写切换
void UKeyBoard::on_capsBtn_clicked()
{if (!_capsType)_capsType = true;else_capsType = false;if (_keyType == 1){if (_capsType){changeKeyType(2);}else{changeKeyType(1);}}else if (_keyType == 2){if (_capsType){changeKeyType(4);}else{changeKeyType(3);}}else if (_keyType == 0){QString val = ui->inputEdit->text();int position = ui->inputEdit->cursorPosition();QString wordVal = ui->wordBtn1->text().split(" ").last();if (wordVal.isEmpty())wordVal = ui->selectWordEdit->text();val.insert(position,wordVal+",");ui->inputEdit->setText(val);ui->inputEdit->setCursorPosition(position+wordVal.size()+1);}ui->inputEdit->setFocus();ui->selectWordEdit->clear();ui->selectWordEdit->hide();ui->wordBtn1->setText("");ui->wordBtn2->setText("");ui->wordBtn3->setText("");ui->wordBtn4->setText("");ui->wordBtn5->setText("");ui->wordBtn6->setText("");ui->wordBtn7->setText("");
}
//删除字符
void UKeyBoard::on_delBtn_clicked()
{QString val = ui->selectWordEdit->text();if (!val.isEmpty()){int cursorPosition = ui->selectWordEdit->cursorPosition()-1;val.remove(cursorPosition,1);ui->selectWordEdit->setText(val);ui->selectWordEdit->setCursorPosition(cursorPosition);m_curWords.clear();m_curWords.append(m_wordHash.value(val));for (QHash<QString,QStringList>::const_iterator it = m_wordHash.begin(); it != m_wordHash.end();it++) {if (it.key().indexOf(val) == 0){if (it.key() == val)continue;m_curWords.append(it.value());}}wordChange(val,0);if (val.isEmpty()){ui->wordBtn1->setText("");ui->wordBtn2->setText("");ui->wordBtn3->setText("");ui->wordBtn4->setText("");ui->wordBtn5->setText("");ui->wordBtn6->setText("");ui->wordBtn7->setText("");ui->selectWordEdit->hide();ui->inputEdit->setFocus();}}else{val = ui->inputEdit->text();int cursorPosition = ui->inputEdit->cursorPosition()-1;val.remove(cursorPosition,1);ui->inputEdit->setText(val);ui->inputEdit->setCursorPosition(cursorPosition);}updateSelectInputPos();
}
//切换键盘类型
void UKeyBoard::on_swithBtn_clicked()
{if (_keyType == 0)_keyType = 1;else if (_keyType == 1)_keyType = 2;else if (_keyType == 2)_keyType = 0;_capsType = false;if (_keyType == 0){changeKeyType(0);ui->swithBtn->setText("EN");}else if (_keyType == 1){changeKeyType(1);ui->swithBtn->setText("123");}else{changeKeyType(3);ui->swithBtn->setText("CN");}ui->inputEdit->setFocus();ui->selectWordEdit->clear();ui->selectWordEdit->hide();
}
//空格
void UKeyBoard::on_spaceBtn_clicked()
{int position = ui->inputEdit->cursorPosition();QString val = ui->inputEdit->text();if (_keyType == 0){QString wordVal = ui->wordBtn1->text().split(" ").last();if (wordVal.isEmpty())wordVal = ui->selectWordEdit->text();val.insert(position,wordVal+" ");ui->inputEdit->setText(val);ui->inputEdit->setCursorPosition(position+wordVal.size()+1);}else{val.insert(position," ");ui->inputEdit->setText(val);ui->inputEdit->setCursorPosition(position+1);}ui->inputEdit->setFocus();ui->selectWordEdit->clear();ui->selectWordEdit->hide();ui->wordBtn1->setText("");ui->wordBtn2->setText("");ui->wordBtn3->setText("");ui->wordBtn4->setText("");ui->wordBtn5->setText("");ui->wordBtn6->setText("");ui->wordBtn7->setText("");
}
//光标左移
void UKeyBoard::on_leftMoveBtn_clicked()
{if (ui->selectWordEdit->text().isEmpty()){if (ui->inputEdit->cursorPosition()-1 < 0)ui->inputEdit->setCursorPosition(ui->inputEdit->text().size());elseui->inputEdit->setCursorPosition(ui->inputEdit->cursorPosition()-1);}else{if (ui->selectWordEdit->cursorPosition()-1 < 0)ui->selectWordEdit->setCursorPosition(ui->selectWordEdit->text().size());elseui->selectWordEdit->setCursorPosition(ui->selectWordEdit->cursorPosition()-1);}
}//光标右移
void UKeyBoard::on_rightMoveBtn_clicked()
{if (ui->selectWordEdit->text().isEmpty()){if (ui->inputEdit->cursorPosition()+1 > ui->inputEdit->text().size())ui->inputEdit->setCursorPosition(0);elseui->inputEdit->setCursorPosition(ui->inputEdit->cursorPosition()+1);}else{if (ui->selectWordEdit->cursorPosition()+1 > ui->selectWordEdit->text().size())ui->selectWordEdit->setCursorPosition(0);elseui->selectWordEdit->setCursorPosition(ui->selectWordEdit->cursorPosition()+1);}
}void UKeyBoard::on_enterBtn_clicked()
{this->hide();
}//切换键盘类型
void UKeyBoard::changeKeyType(int type)
{ui->selectWordEdit->setText("");ui->wordBtn1->setText("");ui->wordBtn2->setText("");ui->wordBtn3->setText("");ui->wordBtn4->setText("");ui->wordBtn5->setText("");ui->wordBtn6->setText("");ui->wordBtn7->setText("");if (type == 0){_capsType = false;ui->Key_A_Btn->setText("a");ui->Key_S_Btn->setText("s");ui->Key_D_Btn->setText("d");ui->Key_F_Btn->setText("f");ui->Key_G_Btn->setText("g");ui->Key_H_Btn->setText("h");ui->Key_J_Btn->setText("j");ui->Key_K_Btn->setText("k");ui->Key_L_Btn->setText("l");ui->Key_Q_Btn->setText("q");ui->Key_W_Btn->setText("w");ui->Key_E_Btn->setText("e");ui->Key_R_Btn->setText("r");ui->Key_T_Btn->setText("t");ui->Key_Y_Btn->setText("y");ui->Key_U_Btn->setText("u");ui->Key_I_Btn->setText("i");ui->Key_O_Btn->setText("o");ui->Key_P_Btn->setText("p");ui->Key_Z_Btn->setText("z");ui->Key_X_Btn->setText("x");ui->Key_C_Btn->setText("c");ui->Key_V_Btn->setText("v");ui->Key_B_Btn->setText("b");ui->Key_N_Btn->setText("n");ui->Key_M_Btn->setText("m");ui->capsBtn->setIcon(QIcon());ui->capsBtn->setText(".");}else if (type == 1){_capsType = false;ui->Key_A_Btn->setText("a");ui->Key_S_Btn->setText("s");ui->Key_D_Btn->setText("d");ui->Key_F_Btn->setText("f");ui->Key_G_Btn->setText("g");ui->Key_H_Btn->setText("h");ui->Key_J_Btn->setText("j");ui->Key_K_Btn->setText("k");ui->Key_L_Btn->setText("l");ui->Key_Q_Btn->setText("q");ui->Key_W_Btn->setText("w");ui->Key_E_Btn->setText("e");ui->Key_R_Btn->setText("r");ui->Key_T_Btn->setText("t");ui->Key_Y_Btn->setText("y");ui->Key_U_Btn->setText("u");ui->Key_I_Btn->setText("i");ui->Key_O_Btn->setText("o");ui->Key_P_Btn->setText("p");ui->Key_Z_Btn->setText("z");ui->Key_X_Btn->setText("x");ui->Key_C_Btn->setText("c");ui->Key_V_Btn->setText("v");ui->Key_B_Btn->setText("b");ui->Key_N_Btn->setText("n");ui->Key_M_Btn->setText("m");ui->capsBtn->setIcon(QIcon(":/img/keyboard-up_1.png"));ui->capsBtn->setIconSize(QSize(28,33));ui->capsBtn->setText("");}else if (type == 2){ui->Key_A_Btn->setText("A");ui->Key_S_Btn->setText("S");ui->Key_D_Btn->setText("D");ui->Key_F_Btn->setText("F");ui->Key_G_Btn->setText("G");ui->Key_H_Btn->setText("H");ui->Key_J_Btn->setText("J");ui->Key_K_Btn->setText("K");ui->Key_L_Btn->setText("L");ui->Key_Q_Btn->setText("Q");ui->Key_W_Btn->setText("W");ui->Key_E_Btn->setText("E");ui->Key_R_Btn->setText("R");ui->Key_T_Btn->setText("T");ui->Key_Y_Btn->setText("Y");ui->Key_U_Btn->setText("U");ui->Key_I_Btn->setText("I");ui->Key_O_Btn->setText("O");ui->Key_P_Btn->setText("P");ui->Key_Z_Btn->setText("Z");ui->Key_X_Btn->setText("X");ui->Key_C_Btn->setText("C");ui->Key_V_Btn->setText("V");ui->Key_B_Btn->setText("B");ui->Key_N_Btn->setText("N");ui->Key_M_Btn->setText("M");ui->capsBtn->setIcon(QIcon(":/img/keyboard-up.png"));ui->capsBtn->setIconSize(QSize(28,33));ui->capsBtn->setText("");}else if (type == 3){ui->Key_A_Btn->setText("-");ui->Key_S_Btn->setText("+");ui->Key_D_Btn->setText("=");ui->Key_F_Btn->setText("/");ui->Key_G_Btn->setText("\\");ui->Key_H_Btn->setText(";");ui->Key_J_Btn->setText("`");ui->Key_K_Btn->setText(",");ui->Key_L_Btn->setText(".");ui->Key_Q_Btn->setText("1");ui->Key_W_Btn->setText("2");ui->Key_E_Btn->setText("3");ui->Key_R_Btn->setText("4");ui->Key_T_Btn->setText("5");ui->Key_Y_Btn->setText("6");ui->Key_U_Btn->setText("7");ui->Key_I_Btn->setText("8");ui->Key_O_Btn->setText("9");ui->Key_P_Btn->setText("0");ui->Key_Z_Btn->setText("[");ui->Key_X_Btn->setText("]");ui->Key_C_Btn->setText("‘");ui->Key_V_Btn->setText("...");ui->Key_B_Btn->setText("￥");ui->Key_N_Btn->setText("。");ui->Key_M_Btn->setText("、");ui->capsBtn->setIcon(QIcon());ui->capsBtn->setText("#+=");}else if (type == 4){ui->Key_A_Btn->setText("!");ui->Key_S_Btn->setText("@");ui->Key_D_Btn->setText("#");ui->Key_F_Btn->setText("$");ui->Key_G_Btn->setText("%");ui->Key_H_Btn->setText("^");ui->Key_J_Btn->setText("&");ui->Key_K_Btn->setText("*");ui->Key_L_Btn->setText("(");ui->Key_Q_Btn->setText(")");ui->Key_W_Btn->setText("_");ui->Key_E_Btn->setText("°");ui->Key_R_Btn->setText("{");ui->Key_T_Btn->setText("}");ui->Key_Y_Btn->setText("|");ui->Key_U_Btn->setText(":");ui->Key_I_Btn->setText("\"");ui->Key_O_Btn->setText("<");ui->Key_P_Btn->setText(">");ui->Key_Z_Btn->setText("?");ui->Key_X_Btn->setText("~");ui->Key_C_Btn->setText("”");ui->Key_V_Btn->setText("“");ui->Key_B_Btn->setText("《");ui->Key_N_Btn->setText("》");ui->Key_M_Btn->setText("—");ui->capsBtn->setIcon(QIcon());ui->capsBtn->setText("123");}
}

完整源码