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[增强 PasswordLineEdit 功能，添加 Caps Lock 状态提示]: 重构 PasswordLineEdit 组件，使用 Pimpl 模式优化实现细节，并在 Windows 平台下增加 Caps Lock 状态检测与提示功能，同时改进 UI 样式和交互体验。
- **PasswordLineEdit.pro**: 添加 Windows 平台下链接 user32 库的配置，支持 Caps Lock 检测功能 - **passwordlineedit.cc/hpp**: 使用 Pimpl 模式重构 PasswordLineEdit 类，隐藏实现细节 - **Caps Lock 检测功能**: 在 Windows 平台下实现 Caps Lock 状态检测（使用 GetKeyState 函数） - **提示标签功能**: 在密码输入框上方添加提示标签，显示 Caps Lock 状态（开启/关闭） - **事件过滤器**: 添加事件过滤器处理键盘释放事件和焦点进入事件，实时检测 Caps Lock 状态 - **UI 样式改进**: 使用正则表达式验证输入内容，限制特殊字符输入 - **计时器功能**: 添加计时器功能，3秒后自动隐藏 Caps Lock 提示标签 - **代码结构优化**: 重构构造函数和析构函数，分离 UI 设置和信号槽连接逻辑
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‎PasswordLineEdit/PasswordLineEdit.pro

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Original file line numberDiff line numberDiff line change
@@ -17,6 +17,8 @@ HEADERS += \
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RESOURCES += \
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resources.qrc
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win32: LIBS += -luser32
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# Default rules for deployment.
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qnx: target.path = /tmp/$${TARGET}/bin
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else: unix:!android: target.path = /opt/$${TARGET}/bin

‎PasswordLineEdit/passwordlineedit.cc

Lines changed: 113 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -2,40 +2,131 @@
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#include <QtWidgets>
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5-
PasswordLineEdit::PasswordLineEdit(QWidget *parent)
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: QLineEdit(parent)
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#ifdef Q_OS_WIN
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#include <windows.h>
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#endif
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bool isCapsLockOn()
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{
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setAttribute(Qt::WA_InputMethodEnabled, false);
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setStyleSheet("QLineEdit{ border:none; border-bottom: 1px solid #DDDDDD; color: #222222; "
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"padding-left:10px; font-size:14px; }"
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"QToolButton{ border: none; }");
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setPlaceholderText(tr("Please enter the password."));
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setMinimumSize(200, 30);
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#ifdef Q_OS_WIN
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return (GetKeyState(VK_CAPITAL) & 0x0001) != 0;
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#else
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qWarning() << "Unsupported platform";
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return false;
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#endif
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}
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m_hidden_icon.addFile("://resources/hidden_password.png");
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m_view_icon.addFile("://resources/view_password.png");
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class PasswordLineEdit::PasswordLineEditPrivate
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{
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public:
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explicit PasswordLineEditPrivate(PasswordLineEdit *q)
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: q_ptr(q)
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{
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toolButton = new QToolButton(q_ptr);
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toolButton->setIconSize({25, 25});
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toolButton->setCursor(Qt::PointingHandCursor);
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toolButton->setCheckable(true);
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m_toolButton = new QToolButton(this);
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m_toolButton->setIconSize(QSize(25, 25));
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m_toolButton->setCursor(Qt::PointingHandCursor);
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m_toolButton->setCheckable(true);
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connect(m_toolButton, &QToolButton::clicked, this, &PasswordLineEdit::onShowPassword);
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QHBoxLayout *layout = new QHBoxLayout(this);
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layout->setContentsMargins(1, 1, 10, 1);
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layout->setSpacing(0);
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layout->addStretch();
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layout->addWidget(m_toolButton);
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hiddenIcon.addFile("://resources/hidden_password.png");
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viewIcon.addFile("://resources/view_password.png");
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labelPtr.reset(new QLabel);
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labelPtr->setWindowFlags(labelPtr->windowFlags() | Qt::ToolTip);
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labelPtr->setStyleSheet("QLabel{background: #909090; padding:5px; color: #E60000;"
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"font-size:12px; font-weight:bold;}");
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labelPtr->hide();
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timer = new QTimer(q_ptr);
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timer->setInterval(3000);
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}
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~PasswordLineEditPrivate() {}
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void showLabel(const QString &text)
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{
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labelPtr->setText(text);
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labelPtr->show();
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auto point = q_ptr->mapToGlobal(QPoint(10, -labelPtr->height() / 2));
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labelPtr->move(point);
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timer->start();
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}
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PasswordLineEdit *q_ptr;
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QToolButton *toolButton;
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QIcon hiddenIcon;
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QIcon viewIcon;
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QScopedPointer<QLabel> labelPtr;
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QTimer *timer;
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};
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PasswordLineEdit::PasswordLineEdit(QWidget *parent)
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: QLineEdit(parent)
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, d_ptr(new PasswordLineEditPrivate(this))
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{
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setupUI();
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buildConnect();
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#ifdef Q_OS_WIN
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installEventFilter(this);
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#endif
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onShowPassword(false);
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}
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PasswordLineEdit::~PasswordLineEdit() {}
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void PasswordLineEdit::onShowPassword(bool state)
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{
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if (state) {
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setEchoMode(Normal);
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m_toolButton->setIcon(m_hidden_icon);
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d_ptr->toolButton->setIcon(d_ptr->hiddenIcon);
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} else {
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setEchoMode(Password);
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m_toolButton->setIcon(m_view_icon);
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d_ptr->toolButton->setIcon(d_ptr->viewIcon);
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}
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}
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bool PasswordLineEdit::eventFilter(QObject *watched, QEvent *event)
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{
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if (watched == this) {
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switch (event->type()) {
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case QEvent::KeyRelease: {
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auto *keyEvent = static_cast<QKeyEvent *>(event);
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if (keyEvent->key() == Qt::Key_CapsLock) {
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d_ptr->showLabel(isCapsLockOn() ? tr("Caps Lock On") : tr("Caps Lock Off"));
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}
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} break;
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case QEvent::FocusIn:
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if (isCapsLockOn()) {
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d_ptr->showLabel(tr("Caps Lock On"));
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}
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break;
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default: break;
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}
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}
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return QLineEdit::eventFilter(watched, event);
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}
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void PasswordLineEdit::setupUI()
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{
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setStyleSheet("QLineEdit{border:none; border-bottom: 1px solid #DDDDDD;"
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"color: #222222; padding-left:10px; font-size:14px; }"
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"QToolButton{border: none;}");
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setPlaceholderText(tr("Please enter the password."));
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setMinimumSize(200, 30);
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QRegularExpression regExp("[a-zA-Z0-9!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~]+");
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setValidator(new QRegularExpressionValidator(regExp, this));
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setAttribute(Qt::WA_InputMethodEnabled, false);
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auto *layout = new QHBoxLayout(this);
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layout->setContentsMargins(1, 1, 10, 1);
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layout->setSpacing(0);
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layout->addStretch();
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layout->addWidget(d_ptr->toolButton);
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}
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void PasswordLineEdit::buildConnect()
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{
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connect(d_ptr->toolButton, &QToolButton::clicked, this, &PasswordLineEdit::onShowPassword);
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connect(d_ptr->timer, &QTimer::timeout, d_ptr->labelPtr.data(), &QLabel::hide);
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}

‎PasswordLineEdit/passwordlineedit.hpp

Lines changed: 11 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,4 @@
1-
#ifndef PASSWORDLINEEDIT_HPP
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#define PASSWORDLINEEDIT_HPP
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#pragma once
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#include <QLineEdit>
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@@ -8,14 +7,18 @@ class PasswordLineEdit : public QLineEdit
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Q_OBJECT
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public:
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explicit PasswordLineEdit(QWidget *parent = nullptr);
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~PasswordLineEdit() override;
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private slots:
13-
void onShowPassword(bool);
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void onShowPassword(bool state);
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protected:
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bool eventFilter(QObject *watched, QEvent *event) override;
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private:
16-
QToolButton *m_toolButton;
17-
QIcon m_hidden_icon;
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QIcon m_view_icon;
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};
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void setupUI();
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void buildConnect();
2021

21-
#endif // PASSWORDLINEEDIT_HPP
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class PasswordLineEditPrivate;
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QScopedPointer<PasswordLineEditPrivate> d_ptr;
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};

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