Qt实现移动端Toast提示消息

深碍√TFBOYSˉ_ 2022-04-25 10:12 425阅读 0赞

先上具体的实现效果图：  
![在这里插入图片描述][20190531124228383.gif]  
弹出提示后，提示框在一定时间内消失。

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## 程序 ##

程序头文件定义：

/** @file   Toast.h
     *  @brief  Qt模拟安卓移动客户端Toast提示消息
     *  @note   qss set in ui file
     *  @author lesliefish
     *  @date   2019/05/31
     */
    #pragma once
    
    #include <QtWidgets/QWidget>
    #include "ui_Toast.h"
    
    class Toast : public QWidget
    {
        Q_OBJECT
    
    public:
        Toast(QWidget *parent = Q_NULLPTR);
        ~Toast();
    
        void setText(const QString& text);
    
        void showAnimation(int timeout = 2000);// 动画方式show出，默认2秒后消失
    
    public:
        // 静态调用
        static void showTip(const QString& text, QWidget* parent = nullptr);
    
    protected:
        virtual void paintEvent(QPaintEvent *event);
    
    private:
        Ui::ToastClass ui;
    };

cpp文件：

#include "Toast.h"
    #include <QPropertyAnimation>
    #include <QScreen>
    #include <QGuiApplication>
    #include <QPainter>
    #include <QTimer>
    
    Toast::Toast(QWidget *parent)
        : QWidget(parent)
    {
        ui.setupUi(this);
    
        setWindowFlags(windowFlags() | Qt::FramelessWindowHint | Qt::Tool);// 无边框 无任务栏
        setAttribute(Qt::WA_TranslucentBackground, true);   // 背景透明
    }
    
    Toast::~Toast()
    {
    }
    
    void Toast::setText(const QString& text)
    {
        ui.label->setText(text);
    }
    
    void Toast::showAnimation(int timeout /*= 2000*/)
    {
        // 开始动画
        QPropertyAnimation *animation = new QPropertyAnimation(this, "windowOpacity");
        animation->setDuration(1000);
        animation->setStartValue(0);
        animation->setEndValue(1);
        animation->start();
        show();
    
        QTimer::singleShot(timeout, [&]
        {
            // 结束动画
            QPropertyAnimation *animation = new QPropertyAnimation(this, "windowOpacity");
            animation->setDuration(1000);
            animation->setStartValue(1);
            animation->setEndValue(0);
            animation->start();
            connect(animation, &QPropertyAnimation::finished, [&]
            {
                close();
                deleteLater();// 关闭后析构
            });
        });
    }
    
    void Toast::showTip(const QString& text, QWidget* parent /*= nullptr*/)
    {
        Toast* toast = new Toast(parent);
        toast->setWindowFlags(toast->windowFlags() | Qt::WindowStaysOnTopHint); // 置顶
        toast->setText(text);
        toast->adjustSize();    //设置完文本后调整下大小
    
        // 测试显示位于主屏的70%高度位置
        QScreen* pScreen = QGuiApplication::primaryScreen();
        toast->move((pScreen->size().width() - toast->width()) / 2, pScreen->size().height() * 7 / 10);
        toast->showAnimation();
    }
    
    void Toast::paintEvent(QPaintEvent *event)
    {
        QPainter paint(this);
        paint.begin(this);
        auto kBackgroundColor = QColor(255, 255, 255);
        kBackgroundColor.setAlpha(0.0 * 255);// 透明度为0 
        paint.setRenderHint(QPainter::Antialiasing, true);
        paint.setPen(Qt::NoPen);
        paint.setBrush(QBrush(kBackgroundColor, Qt::SolidPattern));//设置画刷形式 
        paint.drawRect(0, 0, width(), height());
        paint.end();
    }

测试程序代码：

#include "Toast.h"
    #include <QtWidgets/QApplication>
    #include <QTimer>
    
    int main(int argc, char *argv[])
    {
        QApplication app(argc, argv);
    
        QStringList texts{};
        texts << QStringLiteral("真理惟一可靠的标准就是永远自相符合。")
            << QStringLiteral("Saying and doing are two different things.")
            << QStringLiteral("Two heads are better than one.")
            << QStringLiteral("Time flies.")
            << QStringLiteral("勿谓言之不预！")
            << QStringLiteral("Good company on the road is the shortest cut.")
            << QStringLiteral("Time to go.")
            << QStringLiteral("It is never too late to learn.")
            << QStringLiteral("贸易战中国必胜！");
    
        QTimer timer;
        QObject::connect(&timer, &QTimer::timeout, [&]
        {
            static int i = 0;
            Toast::showTip(texts[i%texts.size()], nullptr);
            i++;
        });
        Toast::showTip(QString("Let's go."), nullptr);
        timer.start(4000);
    
        return app.exec();
    }

--------------------

## 完整工程源码路径 ##

环境：vs2015+Qt5.9.6  
[https://github.com/lesliefish/Qt/tree/master/UI/Toast][https_github.com_lesliefish_Qt_tree_master_UI_Toast]

[20190531124228383.gif]: /images/20220125/ae0e3d8f9ac24eb987c4d9b93455cd07.png
[https_github.com_lesliefish_Qt_tree_master_UI_Toast]: https://github.com/lesliefish/Qt/tree/master/UI/Toast