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目录
一、前言
由于系统自带虚拟键盘不一定好用，也不一定好看，有的按键太小，有的电脑上可能没有自带的软键盘，干脆直接自己设计一个。
在现代的用户界面设计中，屏幕键盘是一种重要的辅助工具，特别是在触摸屏设备上。本文将深入解析一个使用Qt框架自制的屏幕键盘，具有丰富的功能和用户友好的界面，支持中文输入、组合键操作等多种特性。
之前写过一篇不带中文的屏幕键盘，本文在该基础上升级部分功能：QT自制软键盘 最完美、最简单、跟自带虚拟键盘一样（一）
二、本自制虚拟键盘特点
1.支持中文输入。
2.支持组合键，例如“Ctrl+C”复制粘贴操作。
3.键盘界面保持在所有界面最上方。
4.点击键盘按钮不会改变底层文本输入框焦点。
5.通过模拟键盘点击事件完成键盘输入文本信息。
6.包含各种键盘自带符号输入。
7.长按按键可以持续重复输入键盘内容。
三、中文输入原理
资源中包含了“PinYin_Chinese.txt”文本文件，文件内容为七千多个汉字以及对应的拼音，通过加载中文拼音数据，实现了基于拼音的中文输入。在用户输入拼音时，屏幕键盘匹配对应的汉字词组，并显示在候选列表中。
加载中文汉字代码：
void frmKeyBoard::loadChineseFontData() { QFile pinyin(":/PinYin_Chinese.txt"); if (!pinyin.open(QIODevice::ReadOnly)) { qDebug() << "Open pinyin file failed!"; return; } while (!pinyin.atEnd()) { QString buf = QString::fromUtf8(pinyin.readLine()).trimmed(); if (buf.isEmpty()) continue; /* 去除#号后的注释内容 */ if (buf.left(1) == "#") continue; buf=buf.replace("\t"," "); QString pinyin = buf.mid(1,buf.size() - 1); QString word = buf.mid(0,1); QString abb; QStringList pinyinList = pinyin.split(" "); for (int i = 0; i < pinyinList.count(); i++) { /* 获得拼音词组的首字母(用于缩写匹配) */ abb += pinyinList.at(i).left(1); } QList<QPair<QString, QString>> &tmp = m_data[pinyin.left(1)]; /* 将'拼音(缩写)'和'词组'写入匹配容器 */ tmp.append(qMakePair(abb, word)); /* 将'拼音(全拼)'和'词组'写入匹配容器 */ tmp.append(qMakePair(pinyin.remove(" "), word)); } qDebug() << m_data.size(); pinyin.close(); }点击列表选择汉字输入：
void frmKeyBoard::on_listWidget_itemClicked(QListWidgetItem *item) { QKeyEvent keyPress(QEvent::KeyPress, 0, m_curModifier, item->text().right(1)); QKeyEvent keyRelease(QEvent::KeyRelease, 0, m_curModifier, item->text().right(1)); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); }另外，点击汉字对应的数字、点击空格都可以输入汉字，点击回车输入对应的英文字母，部分关键代码：
void frmKeyBoard::slotKeyButtonClicked() { QPushButton* pbtn = (QPushButton*)sender(); QString objectName = pbtn->objectName(); if (pbtn->text().contains("Backspace")) { if(isChinese){ if(recordLitterBuf.size() > 0){ recordLitterBuf.remove(recordLitterBuf.size() - 1, 1); findChineseFontData(recordLitterBuf); if(!m_labelShowPinyin->text().isEmpty()) m_labelShowPinyin->setText(recordLitterBuf); } } else{ QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Backspace, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Backspace, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } else if(pbtn->text() == "Space") { if(isChinese){ if(ui.listWidget->count() > 0){ //按下空格输入列表第一汉字 on_listWidget_itemClicked(ui.listWidget->item(0)); } } else{ QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Space, m_curModifier, " "); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Space, m_curModifier, " "); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } else if (pbtn->text().contains("Enter")) { if(isChinese){ if(!m_labelShowPinyin->text().isEmpty()){ //按下回车输入拼音字母 QKeyEvent keyPress(QEvent::KeyPress, 0, m_curModifier, m_labelShowPinyin->text()); QKeyEvent keyRelease(QEvent::KeyRelease, 0,m_curModifier, m_labelShowPinyin->text()); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); } } else{ QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Enter, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Enter, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } else if (pbtn->text().contains("Shift")) { if (pbtn->isChecked()) { isChinese = true; m_curModifier = Qt::ShiftModifier; for (auto pbtnKey : m_letterKeys) { pbtnKey->setText(pbtnKey->text().toUpper()); } } else { isChinese = false; ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); m_curModifier = Qt::NoModifier; for (auto pbtnKey : m_letterKeys) { pbtnKey->setText(pbtnKey->text().toLower()); } } QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Shift, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Shift, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } //...... else { QString symbol; if (ui.pushButton_shift->isChecked()) symbol = pbtn->text().split("\n").at(0); else symbol = pbtn->text().split("\n").at(1); QKeyEvent keyPress(QEvent::KeyPress, m_mapSymbolKeys.value(symbol), m_curModifier, symbol); QKeyEvent keyRelease(QEvent::KeyRelease, m_mapSymbolKeys.value(symbol), m_curModifier, symbol); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } 四、组合键输入
4.1 定义m_curModifier 记录当前键盘模式。
Qt::KeyboardModifier m_curModifier = Qt::NoModifier;
4.2 特殊按键选中时切换对应的按键模式
if (pbtn->text().contains("Ctrl")) { if(pbtn->isChecked()) m_curModifier = Qt::ControlModifier; else m_curModifier = Qt::NoModifier; QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Control, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Control, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); }五、键盘事件模拟
通过模拟键盘事件，实现了对底层文本输入框的模拟输入。这样，用户可以在使用屏幕键盘的同时，保持对其他界面元素的操作。
QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Enter, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Enter, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease);另外，通过qApp->focusWidget()获取当前焦点所在的窗口，可以将键盘模拟输入到各个窗口的输入框中。
六、界面
界面新增了一个QListWidget用于显示候选汉字列表，列表方向从左至右。
七、代码
7.1 frmKeyBoard 头文件代码
#pragma once #pragma execution_character_set("utf-8") #include <QDialog> #include "ui_frmKeyBoard.h" #include <QPushButton> #include <QKeyEvent> #include <QDebug> #include <QStyle> #include <QListWidgetItem> #include <QLabel> #include <QVBoxLayout> #include <QToolTip> class frmKeyBoard : public QDialog { Q_OBJECT public: frmKeyBoard(QWidget *parent = nullptr); ~frmKeyBoard(); void initFocusWidget(QWidget*); private slots: void slotKeyButtonClicked(); void slotKeyLetterButtonClicked(); void slotKeyNumberButtonClicked(); void on_listWidget_itemClicked(QListWidgetItem *item); void on_toolButton_lastPage_clicked(); void on_toolButton_nextPage_clicked(); private: Ui::frmKeyBoardClass ui; void initFrm(); void initStyleSheet(); void loadChineseFontData(); void findChineseFontData(QString text); void addOneItem(QString text); QMap<QString, QList<QPair<QString, QString>>> m_data; bool isChinese = false; QString recordLitterBuf; QVector<QPushButton*> m_letterKeys; QVector<QPushButton*> m_NumberKeys; QMap<QString, Qt::Key> m_mapSymbolKeys; QStringList m_showTextList; int m_curPage = 0; QLabel* m_labelShowPinyin; Qt::KeyboardModifier m_curModifier = Qt::NoModifier; }; 7.2 frmKeyBoard 源文件代码
#include "frmKeyBoard.h" frmKeyBoard::frmKeyBoard(QWidget *parent) : QDialog(parent) { ui.setupUi(this); this->setWindowFlags(Qt::WindowStaysOnTopHint | Qt::WindowDoesNotAcceptFocus); this->setWindowTitle("屏幕键盘（源客V）"); this->setWindowModality(Qt::WindowModal); this->setAttribute(Qt::WA_DeleteOnClose); this->initFrm(); this->initStyleSheet(); this->loadChineseFontData(); } frmKeyBoard::~frmKeyBoard() { } void frmKeyBoard::initFrm() { m_letterKeys.clear(); m_NumberKeys.clear(); QList<QPushButton*> pbtns = this->findChildren<QPushButton*>(); foreach(QPushButton * pbtn, pbtns) { pbtn->setAutoRepeat(true); //允许自动重复 pbtn->setAutoRepeatDelay(500);//设置重复操作的时延 if (pbtn->text() >= 'a' && pbtn->text() <= 'z') { connect(pbtn, &QPushButton::clicked, this, &frmKeyBoard::slotKeyLetterButtonClicked); m_letterKeys.push_back(pbtn); } else if (pbtn->text().toInt() > 0 && pbtn->text().toInt() <= 9 || pbtn->text() == "0") { connect(pbtn, &QPushButton::clicked, this, &frmKeyBoard::slotKeyNumberButtonClicked); m_NumberKeys.push_back(pbtn); } else{ connect(pbtn, &QPushButton::clicked, this, &frmKeyBoard::slotKeyButtonClicked); } } //添加label显示拼音 m_labelShowPinyin = new QLabel(); QVBoxLayout* vLayout = new QVBoxLayout(); vLayout->addWidget(m_labelShowPinyin); vLayout->addStretch(); ui.listWidget->setLayout(vLayout); m_mapSymbolKeys.insert("~", Qt::Key_AsciiTilde); m_mapSymbolKeys.insert("`", Qt::Key_nobreakspace); m_mapSymbolKeys.insert("-", Qt::Key_Minus); m_mapSymbolKeys.insert("_", Qt::Key_Underscore); m_mapSymbolKeys.insert("+", Qt::Key_Plus); m_mapSymbolKeys.insert("=", Qt::Key_Equal); m_mapSymbolKeys.insert(",", Qt::Key_Comma); m_mapSymbolKeys.insert(".", Qt::Key_Period); m_mapSymbolKeys.insert("/", Qt::Key_Slash); m_mapSymbolKeys.insert("<", Qt::Key_Less); m_mapSymbolKeys.insert(">", Qt::Key_Greater); m_mapSymbolKeys.insert("?", Qt::Key_Question); m_mapSymbolKeys.insert("[", Qt::Key_BracketLeft); m_mapSymbolKeys.insert("]", Qt::Key_BracketRight); m_mapSymbolKeys.insert("{", Qt::Key_BraceLeft); m_mapSymbolKeys.insert("}", Qt::Key_BraceRight); m_mapSymbolKeys.insert("|", Qt::Key_Bar); m_mapSymbolKeys.insert("\\", Qt::Key_Backslash); m_mapSymbolKeys.insert(":", Qt::Key_Colon); m_mapSymbolKeys.insert(";", Qt::Key_Semicolon); m_mapSymbolKeys.insert("\"", Qt::Key_QuoteLeft); m_mapSymbolKeys.insert("'", Qt::Key_Apostrophe); } void frmKeyBoard::initStyleSheet() { QString qss; qss += "QWidget{ background-color:rgb(26,26,26)}"; qss += "QToolButton{ color:white; font:bold 11pt;}"; qss += "QLabel{ color:white; font:13pt;}"; qss += "QListWidget{ color:white; border:none; padding-bottom:10px; }"; qss += "QListWidget::item:hover,QListWidget::item:selected{font:bold; color:yellow; background-color:rgba(0,0,0,0)}"; qss += "QPushButton{ color:white; background-color:rgb(51,51,51); height:50px; font-size:bold 15pt; border:1px solid rgb(26,26,26); border-radius: 0px; min-width:50px;}"; qss += "QPushButton:hover{background-color:rgb(229,229,229); color:black;}"; qss += "QPushButton:pressed,QPushButton:checked{background-color:rgb(0,118,215);}"; qss += "#pushButton_closeKeyboard{background-color:rgba(0,0,0,0); border:0px}"; qss += "#pushButton_closeKeyboard:hover{background-color:#b30220;}"; qss += "#pushButton_space{min-width:500px;}"; qss += "#pushButton_backspace,#pushButton_shift{min-width:100px;}"; qss += "#pushButton_enter{min-width:120px;}"; qss += "#pushButton_tab,#pushButton_ctrl{min-width:70px;}"; qss += "#pushButton_capsLock{min-width:80px;}"; qss += "#pushButton_up{min-width:150px;}"; this->setStyleSheet(qss); } void frmKeyBoard::loadChineseFontData() { QFile pinyin(":/PinYin_Chinese.txt"); if (!pinyin.open(QIODevice::ReadOnly)) { qDebug() << "Open pinyin file failed!"; return; } while (!pinyin.atEnd()) { QString buf = QString::fromUtf8(pinyin.readLine()).trimmed(); if (buf.isEmpty()) continue; /* 去除#号后的注释内容 */ if (buf.left(1) == "#") continue; buf=buf.replace("\t"," "); QString pinyin = buf.mid(1,buf.size() - 1); QString word = buf.mid(0,1); QString abb; QStringList pinyinList = pinyin.split(" "); for (int i = 0; i < pinyinList.count(); i++) { /* 获得拼音词组的首字母(用于缩写匹配) */ abb += pinyinList.at(i).left(1); } QList<QPair<QString, QString>> &tmp = m_data[pinyin.left(1)]; /* 将'拼音(缩写)'和'词组'写入匹配容器 */ tmp.append(qMakePair(abb, word)); /* 将'拼音(全拼)'和'词组'写入匹配容器 */ tmp.append(qMakePair(pinyin.remove(" "), word)); } qDebug() << m_data.size(); pinyin.close(); } void frmKeyBoard::findChineseFontData(QString text) { QString lowerText = text.toLower(); m_labelShowPinyin->setText(lowerText); for (int i = 0; i < ui.listWidget->count(); i++) { QListWidgetItem *item = ui.listWidget->takeItem(i); delete item; item = NULL; } ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; if(lowerText.count() <= 0) return; const QList<QPair<QString, QString> > &tmp = m_data[lowerText.left(1)]; bool fond = false; for (int i = 0; i < tmp.count(); i++) { const QPair<QString, QString> &each = tmp.at(i); if (each.first.left(lowerText.count()) != lowerText) continue; fond = true; addOneItem(each.second); m_showTextList.push_back(each.second); } if(!fond){ if(recordLitterBuf.count() > 1){ recordLitterBuf = recordLitterBuf.right(1); findChineseFontData(recordLitterBuf); } else{ QKeyEvent keyPress(QEvent::KeyPress, int(recordLitterBuf.at(0).toLatin1()), m_curModifier, recordLitterBuf); QKeyEvent keyRelease(QEvent::KeyRelease, int(recordLitterBuf.at(0).toLatin1()), m_curModifier, recordLitterBuf); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } } void frmKeyBoard::addOneItem(QString text) { if(ui.listWidget->count() >= 9) return; QString itemText = QString("%1.%2").arg(ui.listWidget->count() + 1).arg(text); QListWidgetItem *item = new QListWidgetItem(itemText); QFont font; font.setPointSize(15); font.setBold(true); font.setWeight(50); item->setFont(font); /* 设置文字居中 */ item->setTextAlignment(Qt::AlignBottom | Qt::AlignHCenter); bool isChineseFlag = QRegExp("^[\u4E00-\u9FA5]+").indexIn(text.left(1)) != -1; int width = font.pointSize(); if (isChineseFlag) width += itemText.count()*font.pointSize()*1.5; else width += itemText.count()*font.pointSize()*2/3; item->setSizeHint(QSize(width, 50)); ui.listWidget->addItem(item); } void frmKeyBoard::slotKeyButtonClicked() { QPushButton* pbtn = (QPushButton*)sender(); QString objectName = pbtn->objectName(); if (pbtn->text().contains("Backspace")) { if(isChinese){ if(recordLitterBuf.size() > 0){ recordLitterBuf.remove(recordLitterBuf.size() - 1, 1); findChineseFontData(recordLitterBuf); if(!m_labelShowPinyin->text().isEmpty()) m_labelShowPinyin->setText(recordLitterBuf); } } else{ QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Backspace, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Backspace, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } else if (pbtn->text().contains("Caps")) { if (pbtn->isChecked()) { for (auto pbtnKey : m_letterKeys) { pbtnKey->setText(pbtnKey->text().toUpper()); } } else { for (auto pbtnKey : m_letterKeys) { pbtnKey->setText(pbtnKey->text().toLower()); } } } else if(pbtn->text() == "Space") { if(isChinese){ if(ui.listWidget->count() > 0){ on_listWidget_itemClicked(ui.listWidget->item(0)); } } else{ QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Space, m_curModifier, " "); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Space, m_curModifier, " "); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } else if (pbtn->text().contains("Tab")) { QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Tab, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Tab, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("Enter")) { if(isChinese){ if(!m_labelShowPinyin->text().isEmpty()){ QKeyEvent keyPress(QEvent::KeyPress, 0, m_curModifier, m_labelShowPinyin->text()); QKeyEvent keyRelease(QEvent::KeyRelease, 0,m_curModifier, m_labelShowPinyin->text()); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); } } else{ QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Enter, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Enter, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } else if (pbtn->text().contains("Shift")) { if (pbtn->isChecked()) { isChinese = true; m_curModifier = Qt::ShiftModifier; for (auto pbtnKey : m_letterKeys) { pbtnKey->setText(pbtnKey->text().toUpper()); } } else { isChinese = false; ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); m_curModifier = Qt::NoModifier; for (auto pbtnKey : m_letterKeys) { pbtnKey->setText(pbtnKey->text().toLower()); } } QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Shift, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Shift, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("Ctrl")) { if(pbtn->isChecked()) m_curModifier = Qt::ControlModifier; else m_curModifier = Qt::NoModifier; QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Control, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Control, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("Win")) { QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Menu, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Menu, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("Alt")) { if(pbtn->isChecked()) m_curModifier = Qt::AltModifier; else m_curModifier = Qt::NoModifier; QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Alt, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Alt, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("↑")) { QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Up, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Up, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("↓")) { QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Down, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Down, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("←")) { QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Left, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Left, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else if (pbtn->text().contains("→")) { QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Right, m_curModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Right, m_curModifier); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } else { QString symbol; if (ui.pushButton_shift->isChecked()) symbol = pbtn->text().split("\n").at(0); else symbol = pbtn->text().split("\n").at(1); QKeyEvent keyPress(QEvent::KeyPress, m_mapSymbolKeys.value(symbol), m_curModifier, symbol); QKeyEvent keyRelease(QEvent::KeyRelease, m_mapSymbolKeys.value(symbol), m_curModifier, symbol); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } void frmKeyBoard::slotKeyLetterButtonClicked() { QPushButton* pbtn = (QPushButton*)sender(); if (pbtn->text() >= 'a' && pbtn->text() <= 'z') { if(isChinese){ recordLitterBuf+=pbtn->text().toLower(); findChineseFontData(recordLitterBuf); } else{ ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); QKeyEvent keyPress(QEvent::KeyPress, int(pbtn->text().at(0).toLatin1()) - 32, m_curModifier, pbtn->text()); QKeyEvent keyRelease(QEvent::KeyRelease, int(pbtn->text().at(0).toLatin1()) - 32, m_curModifier, pbtn->text()); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } else if (pbtn->text() >= 'A' && pbtn->text() <= 'Z') { if(isChinese){ recordLitterBuf+=pbtn->text().toLower(); findChineseFontData(recordLitterBuf); } else{ ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); QKeyEvent keyPress(QEvent::KeyPress, int(pbtn->text().at(0).toLatin1()), m_curModifier, pbtn->text()); QKeyEvent keyRelease(QEvent::KeyRelease, int(pbtn->text().at(0).toLatin1()), m_curModifier, pbtn->text()); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); } } if (ui.pushButton_ctrl->isChecked()) ui.pushButton_ctrl->setChecked(false); if (ui.pushButton_win->isChecked()) ui.pushButton_win->setChecked(false); if (ui.pushButton_alt->isChecked()) ui.pushButton_alt->setChecked(false); m_curModifier = Qt::NoModifier; } void frmKeyBoard::slotKeyNumberButtonClicked() { QPushButton* pbtn = (QPushButton*)sender(); int num = pbtn->text().toInt(); if(isChinese){ if(num > 0 && num < 9 && ui.listWidget->count() >= num){ on_listWidget_itemClicked(ui.listWidget->item(num - 1)); } } else { QKeyEvent keyPress(QEvent::KeyPress, num + 48, m_curModifier, pbtn->text()); QKeyEvent keyRelease(QEvent::KeyRelease, num + 48, m_curModifier, pbtn->text()); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); if (ui.pushButton_ctrl->isChecked()) ui.pushButton_ctrl->setChecked(false); if (ui.pushButton_win->isChecked()) ui.pushButton_win->setChecked(false); if (ui.pushButton_alt->isChecked()) ui.pushButton_alt->setChecked(false); } m_curModifier = Qt::NoModifier; } void frmKeyBoard::on_listWidget_itemClicked(QListWidgetItem *item) { QKeyEvent keyPress(QEvent::KeyPress, 0, m_curModifier, item->text().right(1)); QKeyEvent keyRelease(QEvent::KeyRelease, 0, m_curModifier, item->text().right(1)); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyPress); QApplication::sendEvent(qApp->focusWidget() == nullptr ? this : qApp->focusWidget(), &keyRelease); ui.listWidget->clear(); m_showTextList.clear(); m_curPage = 0; m_labelShowPinyin->clear(); recordLitterBuf.clear(); } void frmKeyBoard::on_toolButton_lastPage_clicked() { if(m_curPage <= 0) return; m_curPage--; ui.listWidget->clear(); for (int i = m_curPage * 9; i < m_curPage * 9 + 9; i++) { if(i >= m_showTextList.count()) break; addOneItem(m_showTextList.at(i)); } } void frmKeyBoard::on_toolButton_nextPage_clicked() { if(m_curPage >= m_showTextList.count() / 9) return; m_curPage++; ui.listWidget->clear(); for (int i = m_curPage * 9; i < m_curPage * 9 + 9; i++) { if(i >= m_showTextList.count()) break; addOneItem(m_showTextList.at(i)); } } 八、使用示例
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); this->setWindowTitle("屏幕键盘测试（源客V）"); QHBoxLayout* layout = new QHBoxLayout(); layout->setContentsMargins(0, 0, 0, 0); layout->addWidget(ui->pushButton, 0, Qt::AlignRight); ui->lineEdit->setLayout(layout); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() { frmKeyBoard* keyBoard = new frmKeyBoard(); keyBoard->show(); } 九、效果
Qt自制虚拟键盘2（支持中文）
十、结语
通过深度解析，我们更全面地了解了这个使用Qt框架自制的屏幕键盘。其设计理念、功能特点和实现原理展示了在用户界面开发中如何灵活运用Qt框架，为用户提供强大而友好的输入方式。对于需要在触摸屏设备上提供良好用户体验的应用，这个自制的屏幕键盘提供了一种出色的解决方案。
前序文章：QT自制软键盘 最完美、最简单、跟自带虚拟键盘一样（一）
源码资源：Qt自制虚拟键盘(支持中文)
本方案已经能满足屏幕键盘输入的大部分需求了，还有不足的地方欢迎大家留言补充。
