網上有很多關于pos機鍵盤不管用, 鎖屏界面加虛擬小鍵盤的知識，也有很多人為大家解答關于pos機鍵盤不管用的問題，今天pos機之家(www.dprolou.com)為大家整理了關于這方面的知識，讓我們一起來看下吧!

本文目錄一覽：

1、pos機鍵盤不管用

pos機鍵盤不管用

一、實現(xiàn)效果

鼠標點擊“密碼輸入欄”，彈出虛擬鍵盤，輸入鎖屏密碼后，點擊虛擬鍵盤外部區(qū)域，則會隱藏虛擬鍵盤，再點擊登錄，成功進入主界面。

二、虛擬鍵盤-程序設計2.1 frmNum.h

#ifndef FRMNUM_H#define FRMNUM_H#include <QWidget>#include <QLineEdit>#include <QPushButton>#include <QTimer>namespace Ui{ class frmNum;}class frmNum : public QWidget{ Q_OBJECTpublic: explicit frmNum(QWidget *parent =nullptr); ~frmNum(); //單例模式,保證一個程序只存在一個輸入法實例對象 static frmNum *Instance() { if (!_instance) { _instance = new frmNum; } return _instance; } void Init(QString style, int fontSize); //初始化窗口,包括字體大小protected: //事件過濾器：處理鼠標按下彈出小鍵盤 bool eventFilter(QObject *obj, QEvent *event);private slots: //焦點改變事件槽函數(shù)處理 void focusChanged(QWidget *oldWidget, QWidget *nowWidget); //小鍵盤按鍵處理槽函數(shù) void btn_clicked(); //改變小鍵盤樣式 void changeStyle(QString topColor, QString bottomColor, QString borderColor, QString textColor); //定時器處理退格鍵 void reClicked();private: Ui::frmNum *ui; static frmNum *_instance; //實例對象 bool isPressBackBtn; //是否長按退格鍵 bool isFirst; //是否首次加載 QPushButton *btnPress; //長按按鈕 QTimer *backBtnTimert; //退格鍵定時器 QWidget *currentWidget; //當前焦點的對象 QLineEdit *currentLineEdit; //當前焦點的單行文本框 QString currentEditType; //當前焦點控件的類型 QString currentStyle; //當前小鍵盤樣式 int currentFontSize; //當前輸入法面板字體大小 bool checkPress(); //校驗當前長按的按鈕//初始化屬性 void ChangeStyle(QString currentStyle); //改變樣式 void insertValue(QString value);//插入值到當前焦點控件 void deleteValue(); //刪除當前焦點控件的一個字符 void clearValue(); //clear當前焦點控件的一個字符};#endif // FRMNUM_H

上面是“虛擬鍵盤程序”的頭文件，這里使用了單例模式，保證一個程序只存在一個輸入法實例對象。

2.2 frmNum.cpp

#include "frmnum.h"#include "ui_frmnum.h"#include <QShortcut>#include <QDebug>frmNum *frmNum::_instance = nullptr;frmNum::frmNum(QWidget *parent) : QWidget(parent), ui(new Ui::frmNum){ ui->setupUi(this); //初始化窗口 Init("black",20); //黑色，字體大小為20px ui->btnClear->setFocus(); ui->btnClear->setShortcut(QKeySequence::InsertParagraphSeparator); ui->btnClear->setShortcut(Qt::Key_Enter); ui->btnClear->setShortcut(Qt::Key_Return);}frmNum::~frmNum(){ delete ui;}//初始化窗口,包括字體大小void frmNum::Init(QString style, int fontSize){ //設置窗口無邊框且窗口顯示在最頂層 this->setWindowFlags(Qt::FramelessWindowHint | Qt::Tool | Qt::WindowStaysOnTopHint); isFirst = true; //是否首次加載 isPressBackBtn = false; //是否長按退格鍵 //退格鍵定時器 backBtnTimert = new QTimer(this); connect(backBtnTimert, SIGNAL(timeout()), this, SLOT(reClicked())); currentWidget = nullptr;//當前焦點的對象 //輸入法面板字體大小,如果需要更改面板字體大小,該這里即可 this->currentFontSize = fontSize; //如果需要更改輸入法面板的樣式,改變style這個形式參數(shù)即可 //blue--淡藍色 dev--dev風格 black--黑色 brown--灰黑色 lightgray--淺灰色 darkgray--深灰色 gray--灰色 silvery--銀色 this->ChangeStyle(style); //初始化小鍵盤上各按鍵屬性 ui->btn0->setProperty("btnNum", true); ui->btn1->setProperty("btnNum", true); ui->btn2->setProperty("btnNum", true); ui->btn3->setProperty("btnNum", true); ui->btn4->setProperty("btnNum", true); ui->btn5->setProperty("btnNum", true); ui->btn6->setProperty("btnNum", true); ui->btn7->setProperty("btnNum", true); ui->btn8->setProperty("btnNum", true); ui->btn9->setProperty("btnNum", true); ui->btnDelete->setProperty("btnOther", true); //鏈接小鍵盤上各數(shù)字鍵與功能鍵的點擊信號到點擊槽函數(shù)上 QList<QPushButton *> btn = this->findChildren<QPushButton *>(); foreach (QPushButton * b, btn) { connect(b, SIGNAL(clicked()), this, SLOT(btn_clicked())); } //綁定全局改變焦點信號槽 connect(qApp, SIGNAL(focusChanged(QWidget *, QWidget *)), this, SLOT(focusChanged(QWidget *, QWidget *))); //綁定按鍵事件過濾器 qApp->installEventFilter(this);}void frmNum::focusChanged(QWidget *oldWidget, QWidget *nowWidget){ //qDebug() << "oldWidget:" << oldWidget << " nowWidget:" << nowWidget; if (nowWidget != nullptr && !this->isAncestorOf(nowWidget)) { /*在Qt5和linux系統(tǒng)中(嵌入式linux除外),當輸入法面板關閉時,焦點會變成無,然后焦點會再次移到焦點控件處 這樣導致輸入法面板的關閉按鈕不起作用,關閉后馬上有控件獲取焦點又顯示. 為此,增加判斷,當焦點是從有對象轉為無對象再轉為有對象時不要顯示. 這里又要多一個判斷,萬一首個窗體的第一個焦點就是落在可輸入的對象中,則要過濾掉*/ #ifndef __arm__ if (oldWidget == nullptr && !isFirst) { return; } #endif isFirst = false; if (nowWidget->inherits("QLineEdit")) { currentLineEdit = static_cast<QLineEdit *>(nowWidget); currentEditType = "QLineEdit"; this->setVisible(true); } else { currentWidget = nullptr; currentLineEdit = nullptr; currentEditType = ""; this->setVisible(false); } QRect rect = nowWidget->rect(); QPoint pos = QPoint(rect.left(), rect.bottom() + 2); pos = nowWidget->mapToGlobal(pos); this->setGeometry(pos.x(), pos.y(), this->width="360px",height="auto" />

bool frmNum::eventFilter(QObject *obj, QEvent *event){ if (event->type() == QEvent::MouseButtonPress) { //確保每次點擊輸入欄都彈出虛擬鍵盤 if (currentEditType == "QLineEdit") { if (obj != ui->btnClear) { this->setVisible(true); } btnPress = static_cast<QPushButton *>(obj); if (checkPress()) { isPressBackBtn = true; backBtnTimert->start(500); } } return false; } else if (event->type() == QEvent::MouseButtonRelease) { btnPress = static_cast<QPushButton *>(obj); if (checkPress()) { isPressBackBtn = false; backBtnTimert->stop(); } return false; } return QWidget::eventFilter(obj, event);}//校驗當前長按的按鈕bool frmNum::checkPress(){ //只有屬于數(shù)字鍵盤的合法按鈕才繼續(xù)處理 bool num_ok = btnPress->property("btnNum").toBool(); bool other_ok = btnPress->property("btnOther").toBool(); if (num_ok || other_ok) { return true; } return false;}//定時器處理退格鍵void frmNum::reClicked(){ if (isPressBackBtn) { backBtnTimert->setInterval(30); btnPress->click(); }}//小鍵盤按鍵處理槽函數(shù)void frmNum::btn_clicked(){ //如果當前焦點控件類型為空,則返回不需要繼續(xù)處理 if (currentEditType == "") { return; } QPushButton *btn = static_cast<QPushButton *>(sender()); QString objectName = btn->objectName(); if (objectName == "btnDelete") { this->deleteValue(); } else if (objectName == "btnClear") { this->clearValue(); } else { QString value = btn->text(); this->insertValue(value); }}//插入值到當前焦點控件void frmNum::insertValue(QString value){ if (currentEditType == "QLineEdit") { currentLineEdit->insert(value); }}//刪除當前焦點控件的一個字符void frmNum::deleteValue(){ if (currentEditType == "QLineEdit") { currentLineEdit->backspace(); }}//清空當前焦點控件的所有字符void frmNum::clearValue(){ if (currentEditType == "QLineEdit") { currentLineEdit->clear(); }}//改變樣式void frmNum::ChangeStyle(QString currentStyle){ if (currentStyle == "blue") { changeStyle("#DEF0FE", "#C0DEF6", "#C0DCF2", "#386487"); } else if (currentStyle == "dev") { changeStyle("#C0D3EB", "#BCCFE7", "#B4C2D7", "#324C6C"); } else if (currentStyle == "gray") { changeStyle("#E4E4E4", "#A2A2A2", "#A9A9A9", "#000000"); } else if (currentStyle == "lightgray") { changeStyle("#EEEEEE", "#E5E5E5", "#D4D0C8", "#6F6F6F"); } else if (currentStyle == "darkgray") { changeStyle("#D8D9DE", "#C8C8D0", "#A9ACB5", "#5D5C6C"); } else if (currentStyle == "black") { changeStyle("#4D4D4D", "#292929", "#D9D9D9", "#CACAD0"); } else if (currentStyle == "brown") { changeStyle("#667481", "#566373", "#C2CCD8", "#E7ECF0"); } else if (currentStyle == "silvery") { changeStyle("#E1E4E6", "#CCD3D9", "#B2B6B9", "#000000"); }}//改變小鍵盤樣式void frmNum::changeStyle(QString topColor, QString bottomColor, QString borderColor, QString textColor){ QStringList qss; qss.append(QString("QWidget#frmNum{background:qlineargradient(spread:pad,x1:0,y1:0,x2:0,y2:1,stop:0 %1,stop:1 %2);}") .arg(topColor).arg(bottomColor)); qss.append("QPushButton{padding:5px;border-radius:3px;}"); qss.append(QString("QPushButton:hover{background:qlineargradient(spread:pad,x1:0,y1:0,x2:0,y2:1,stop:0 %1,stop:1 %2);}") .arg(topColor).arg(bottomColor)); qss.append(QString("QLabel,QPushButton{font-size:%1pt;color:%2;}") .arg(currentFontSize).arg(textColor)); qss.append(QString("QPushButton#btnPre,QPushButton#btnNext,QPushButton#btnClose{padding:5px;}")); qss.append(QString("QPushButton{border:1px solid %1;}") .arg(borderColor)); qss.append(QString("QLineEdit{border:1px solid %1;border-radius:5px;padding:2px;background:none;selection-background-color:%2;selection-color:%3;}") .arg(borderColor).arg(bottomColor).arg(topColor)); this->setStyleSheet(qss.join(""));}

上面是“虛擬鍵盤程序”的源代碼，當檢測焦點在 QlineEdit 單行輸入欄上，則顯示虛擬鍵盤，否則隱藏虛擬鍵盤。虛擬鍵盤調出的顯示位置跟 QlineEdit 對齊，嘗試過但還是無法改變顯示位置。另外可以對上面代碼進行擴展，擴展支持 QTextEdit、QTextBrowser 等窗口部件。

2.3 frmNum.ui三、鎖屏界面-程序設計3.1 lockWin.h

/*注：注意.ui文件中的dailog的focusPolicy要設置為clickFocus*/#ifndef LOCKWIN_H#define LOCKWIN_H#include <QDialog>#include <QDebug>#include "frmnum.h"#define PASSWD "123456" //鎖屏密碼namespace Ui {class LoginWin;}class LockWin : public QDialog{ Q_OBJECTpublic: explicit LockWin(QWidget *parent = nullptr); ~LockWin();private slots: void on_cancelButton_clicked(); //取消按鈕-點擊槽函數(shù)：清空密碼欄 void on_loginButton_clicked(); //登錄按鈕-點擊槽函數(shù)private: Ui::LoginWin *ui; bool eventFilter(QObject *watched, QEvent *event); //事件過濾器 frmNum *myFrmnum;};#endif // LOCKWIN_H

上面是“鎖屏界面程序”的頭文件，這里定義了一個“虛擬鍵盤”類對象指針，鎖屏密碼設置為“123456”。

3.2 lockWin.cpp

#include "lockWin.h"#include "ui_loginwin.h"LockWin::LockWin(QWidget *parent) : QDialog(parent), ui(new Ui::LoginWin){ ui->setupUi(this); //設置窗口無邊框且窗口顯示在最頂層 this->setWindowFlags(Qt::FramelessWindowHint | Qt::Tool | Qt::WindowStaysOnTopHint); //阻塞其父子窗口 this->setWindowModality(Qt::WindowModal); ui->lineEdit->installEventFilter(this); //通過正則表達式設置"密碼輸入欄"，只能輸入數(shù)字0-9,不超過6位 QValidator *accountValidator = new QRegExpValidator(QRegExp("[0-9]{6}")); ui->lineEdit->setValidator(accountValidator); myFrmnum = new frmNum(this);}LockWin::~LockWin(){ delete ui;}//事件過濾器bool LockWin::eventFilter(QObject *watched, QEvent *event){ if(watched ==ui->lineEdit) { if(QEvent::FocusIn == event->type()) { if(ui->lineEdit->echoMode()==QLineEdit::Normal) { ui->lineEdit->clear(); } ui->lineEdit->setEchoMode(QLineEdit::Password); } } // 最后將事件交給上層對話框 return QWidget::eventFilter(watched,event);}//---------------------------slots-----------------------------------------------//取消按鈕-點擊槽函數(shù)：清空密碼欄void LockWin::on_cancelButton_clicked(){ ui->lineEdit->clear();}//登錄按鈕-點擊槽函數(shù)void LockWin::on_loginButton_clicked(){ if(ui->lineEdit->text()==PASSWD) //密碼正確則關閉鎖屏窗口 { this->close(); } else if(ui->lineEdit->text().isEmpty()) { ui->infoLabel->setText("輸入密碼不能為空！"); } else if(ui->lineEdit->text().length()<6) { ui->infoLabel->setText("輸入密碼不足6位！"); ui->lineEdit->clear(); } else { ui->infoLabel->setText("密碼錯誤，請重新輸入"); ui->lineEdit->clear(); }}

上面是“鎖屏界面程序”的源文件，這里使用了this->setWindowModality(Qt::WindowModal)來成為模態(tài)對話框阻塞主界面，即鎖屏界面關閉才能進入主界面。

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以上就是關于pos機鍵盤不管用, 鎖屏界面加虛擬小鍵盤的知識，后面我們會繼續(xù)為大家整理關于pos機鍵盤不管用的知識，希望能夠幫助到大家！