【QT】自定义Toast消息提示

一、功能与演示

消息框快进慢出，定时一段时间后消失

二、源码

Toast.h

#ifndef TOAST_H
#define TOAST_H

#include <QLabel>
#include <QWidget>

class Toast : public QWidget
{
    Q_OBJECT
public:
    explicit Toast(QWidget *parent = nullptr);
    ~Toast();
    void setText(const QString &text);
    void showAnimation(int timeout = 2000);

public:
    static void showTip(const QString &text, QWidget *parent = nullptr);
    static void showTip(const QString &text, int timeout, QWidget *parent = nullptr);

protected:
    virtual void paintEvent(QPaintEvent *event);
};

Toast.cpp

#include "Toast.h"
#include <QGuiApplication>
#include <QPainter>
#include <QPropertyAnimation>
#include <QScreen>
#include <QTimer>
#include <QVBoxLayout>

Toast::Toast(QWidget *parent)
    : QWidget(parent)
{
    setWindowFlags(windowFlags() | Qt::FramelessWindowHint | Qt::Tool);
    setAttribute(Qt::WA_TranslucentBackground, true);
    QVBoxLayout *layout = new QVBoxLayout;
    QLabel *label = new QLabel(this);
    label->setObjectName("labelText");
    label->setStyleSheet("background-color: rgba(255,0,0,0.80);"
                         "border-radius: 16px;"
                         "color: #FFFFFF;"
                         "font-family: microsoft yahei;"
                         "font-size: 30px;"
                         "padding-left:25px;"
                         "padding-right:25px;");
    label ->setAlignment(Qt::AlignCenter);
    label->setWordWrap(true);

    layout->addWidget(label);
    setLayout(layout);
}

Toast::~Toast()
{

}

void Toast::setText(const QString &text)
{
    QLabel *label = this->findChild<QLabel *>("labelText");
    label->setText(text);
}

void Toast::showAnimation(int timeout)
{
    /* 快进慢出 */
    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();
        });
    });
}

void Toast::showTip(const QString &text, QWidget *parent)
{
    Toast *toast = new Toast(parent);
    toast->setWindowFlags(toast->windowFlags() | Qt::WindowStaysOnTopHint); /* 置顶 */
    toast->setText(text);
    toast->adjustSize();   


    QScreen *pScreen = QGuiApplication::primaryScreen();
    toast->move((pScreen->size().width() - toast->width()) / 2, pScreen->size().height() * 0.4);
    toast->showAnimation();
}

void Toast::showTip(const QString &text, int timeout, QWidget *parent)
{
    Toast *toast = new Toast(parent);
    toast->setWindowFlags(toast->windowFlags() | Qt::WindowStaysOnTopHint);
    toast->setText(text);
    toast->adjustSize();   

    QScreen *pScreen = QGuiApplication::primaryScreen();
    toast->move((pScreen->size().width() - toast->width()) / 2, pScreen->size().height() * 0.4);
    toast->showAnimation(timeout);
}

void Toast::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event)
    QPainter paint(this);
    auto kBackgroundColor = QColor(255, 255, 255);
    kBackgroundColor.setAlpha(0.0 * 255); 
    paint.setPen(Qt::NoPen);
    paint.setBrush(QBrush(kBackgroundColor, Qt::SolidPattern)); 
    paint.drawRect(0, 0, width(), height());
}

使用方式

Toast::showTip(tr("Camera disconnected"), 1000, nullptr);