Qt · 密码输入框检测并显示大写锁定键已打开

先上效果图

代码实现

带小三角的悬浮提示窗口

// tiplabel.h
#ifndef TIPLABEL_H
#define TIPLABEL_H/************************************** \brief 带有小三角的tip label* \author NiceBlueChai*************************************/
#include <QLabel>//Triangle tip label
// TODO: 添加属性支持样式表设置样式
// TODO: 支持通过enum选择上下左右四个方向的小三角
class TipLabel : public QLabel
{Q_OBJECT
public:TipLabel(const QString& text, QWidget *parent = nullptr);bool eventFilter(QObject*,QEvent*) override;QSize sizeHint() const override;void updatePos(const QPoint& pos);using CallBackType = std::function<QPoint ()>;void setCallBack( CallBackType updatePosCallBack);void setTopWindow(QWidget* w);protected:void paintEvent(QPaintEvent*) override;private:CallBackType updatePosCallBack;QWidget* top_widget{nullptr};
};#endif // TIPLABEL_H

// tiplabel.cpp
#include "tiplabel.h"
#include <QApplication>
#include <QMouseEvent>
#include <QPainter>
#include <QPolygon>namespace {const int kTriangleHeight = 8;
const int kTriangleWidth = 20;
const int kTriangleLeftMargin = 30;
}TipLabel::TipLabel(const QString &text, QWidget *parent):QLabel(parent, Qt::ToolTip | Qt::FramelessWindowHint | Qt::BypassGraphicsProxyWidget)
{setText(text);setAttribute(Qt::WA_TranslucentBackground, true);setAttribute(Qt::WA_TransparentForMouseEvents, true);qApp->installEventFilter(this);
}bool TipLabel::eventFilter(QObject *o, QEvent *e)
{if(o == parent()){switch(e->type()){case QEvent::WindowDeactivate:hide();default:break;}}if(top_widget  && this->updatePosCallBack && o == top_widget){if(e->type() == QEvent::Move) {updatePos(updatePosCallBack());}}return false;
}QSize TipLabel::sizeHint() const
{return QSize(120, 34);
}void TipLabel::updatePos(const QPoint &pos)
{move(pos- QPoint(kTriangleLeftMargin + kTriangleWidth/2, 0));
}void TipLabel::setCallBack(CallBackType updatePosCallBack)
{this->updatePosCallBack = updatePosCallBack;
}void TipLabel::setTopWindow(QWidget *w)
{top_widget = w;
}void TipLabel::paintEvent(QPaintEvent *)
{QPainter painter(this);QPolygon polygon_triangle, polygon;polygon_triangle << QPoint(kTriangleLeftMargin, kTriangleHeight)<< QPoint(kTriangleLeftMargin + kTriangleWidth/2, 0)<< QPoint(kTriangleWidth + kTriangleLeftMargin, kTriangleHeight)<<QPoint(width() - 1, kTriangleHeight)<< QPoint(width() -1, height() -1)<< QPoint(1, height() -1)<< QPoint(1, kTriangleHeight) <<QPoint(kTriangleLeftMargin, kTriangleHeight);QRectF text_rect = rect().adjusted(0, kTriangleHeight, -1, -1);painter.fillRect(rect(), Qt::transparent);painter.save();painter.setPen(Qt::NoPen);painter.setBrush(Qt::white);painter.drawPolygon(polygon_triangle);painter.drawRoundedRect(text_rect, 6.0, 5.0);painter.setRenderHint(QPainter::Antialiasing, true);painter.setPen(Qt::gray);painter.setBrush(Qt::NoBrush);painter.drawPolyline(polygon_triangle);painter.restore();QTextOption opt;opt.setAlignment(Qt::AlignCenter);painter.drawText(text_rect, text(), opt);
}

使用上面小窗口在Lineedit获得焦点时显示大写锁定已打开

// tiplabel-lineedit.h
#ifndef TIPLABELLINEEDIT_H
#define TIPLABELLINEEDIT_H#include <QLineEdit>class TipLabel;
class TipLabelLineedit : public QLineEdit
{Q_OBJECT
public:explicit TipLabelLineedit(QWidget *parent = nullptr);void setTopWindow(QWidget* w);void setTipVisible(bool v);virtual QPoint tipPos();// QWidget interface
protected:void resizeEvent(QResizeEvent *event) override;void focusInEvent(QFocusEvent* event) override;void focusOutEvent(QFocusEvent* event) override;void keyEvent(QKeyEvent* event) override;private:TipLabel* label;bool tip_visible{false};
};#endif // TIPLABELLINEEDIT_H

#include "tiplabel-lineedit.h"
#include "../IMLabel/tiplabel.h"
#include <QResizeEvent>
#include "gui-util.h"
using namespace IMUtils;TipLabelLineedit::TipLabelLineedit(QWidget *parent): QLineEdit{parent}, label(new TipLabel("大写锁定已打开", this))
{auto calback = [this]()->QPoint{return tipPos();};label->setCallBack(calback);
}void TipLabelLineedit::setTopWindow(QWidget *w)
{label->setTopWindow(w);
}void TipLabelLineedit::setTipVisible(bool v)
{tip_visible = v;
}QPoint TipLabelLineedit::tipPos()
{auto pos = mapToGlobal(QPoint(10, size().height()/2));return pos;
}void TipLabelLineedit::resizeEvent(QResizeEvent *event)
{auto pos = mapToGlobal(QPoint(6, event->size().height()/2));label->updatePos(pos);QLineEdit::resizeEvent(event);
}void TipLabelLineedit::focusInEvent(QFocusEvent *event)
{if(tip_visible && getCapsLockToggled()){label->showNormal();}QLineEdit::focusInEvent(event);
}void TipLabelLineedit::focusOutEvent(QFocusEvent *event)
{label->hide();QLineEdit::focusOutEvent(event);
}void TipLabelLineedit::keyPressEvent(QKeyEvent *event)
{if(tip_visible && getCapsLockToggled()){label->showNormal();}else {label->hide();}QLineEdit::keyPressEvent(event);
}

参考链接

https://stackoverflow.com/questions/2968336/qt-password-field-warn-about-caps-lock
https://blog.csdn.net/nicebluechai/article/details/119177699

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Qt · 密码输入框检测并显示大写锁定键已打开

先上效果图

代码实现

带小三角的悬浮提示窗口

使用上面小窗口在Lineedit获得焦点时显示大写锁定已打开

参考链接

Qt · 密码输入框检测并显示大写锁定键已打开相关推荐

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