qt 提示框 隔几秒后消失

工作中用到了一个功能：触发显示了提示框，然后几秒后自动消失。

 

引用：https://blog.csdn.net/a_1_1_1_2/article/details/119949348

将窗口显示时间定时器设置为单次触发；

该提示窗口关闭前，要先停止渐变定时器。

使用方法：

MessageTips *mMessageTips = new MessageTips(tr("screenshot is ok"), this);//截图成功提示
mMessageTips->move(parentWidget()->x() + 470, parentWidget()->y() + 50);
mMessageTips->show();

 

头文件

#ifndef MESSAGETIPS_H
#define MESSAGETIPS_H

#include <QWidget>
# pragma execution_character_set("utf-8")

class QHBoxLayout;
class QLabel;
class MessageTips : public QWidget
{
    Q_OBJECT
public:
    explicit MessageTips(QString showStr = "默认显示", QWidget *parent = nullptr);

    double getOpacityValue() const;
    void setOpacityValue(double value);

    int getTextSize() const;
    void setTextSize(int value);

    QColor getTextColor() const;
    void setTextColor(const QColor &value);

    QColor getBackgroundColor() const;
    void setBackgroundColor(const QColor &value);

    QColor getFrameColor() const;
    void setFrameColor(const QColor &value);

    int getFrameSize() const;
    void setFrameSize(int value);

    int getShowTime() const;
    void setShowTime(int value);

    void setCloseTimeSpeed(int closeTime = 100, double closeSpeed = 0.1);

protected:
    void paintEvent(QPaintEvent *event) override;

private:
    void InitLayout();//初始化窗体的布局和部件
    QHBoxLayout *hBoxlayout;//布局显示控件布局
    QLabel *mText;//用于显示文字的控件
    QString showStr;//显示的字符串

    double opacityValue;//窗体初始化透明度

    QFont *font;
    int     textSize;//显示字体大小
    QColor  textColor;//字体颜色

    QColor  backgroundColor;//窗体的背景色
    QColor  frameColor;//边框颜色
    int     frameSize;//边框粗细大小

    int     showTime;//显示时间

    int     closeTime;//关闭需要时间
    double  closeSpeed;//窗体消失的平滑度，大小0~1


signals:

};

#endif // MESSAGETIPS_H

源文件：

#include "messagetips.h"

#include <QDesktopWidget>
#include <QHBoxLayout>
#include <QLabel>
#include <QPainter>
#include <QTimer>
#include<QApplication>

MessageTips::MessageTips(QString showStr, QWidget *parent) : QWidget(parent),
opacityValue(1.0),
textSize(18),
textColor(QColor(255, 255, 255)),
backgroundColor(QColor(0, 85, 255, 60)),
frameColor(QColor(211, 211, 211, 60)),
frameSize(2),
showTime(2500),
closeTime(100),
closeSpeed(0.1),
hBoxlayout(new QHBoxLayout(this)),
mText(new QLabel(this))
{
    setWindowFlags(Qt::Window | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::Tool | Qt::X11BypassWindowManagerHint);
    this->setAttribute(Qt::WA_TranslucentBackground); // ****这里很重要****
    this->setAttribute(Qt::WA_TransparentForMouseEvents, true);// 禁止鼠标事件
    this->showStr = showStr;
    hBoxlayout->addWidget(mText);
    InitLayout();
}

void MessageTips::InitLayout()
{
    this->setWindowOpacity(opacityValue);

    //文字显示居中，设置字体，大小，颜色
    font = new QFont("微软雅黑", textSize, QFont::Bold);
    mText->setFont(*font);
    mText->setText(showStr);
    mText->setAlignment(Qt::AlignCenter);
    QPalette label_pe;//设置字体颜色
    label_pe.setColor(QPalette::WindowText, textColor);
    mText->setPalette(label_pe);

    QTimer *mtimer = new QTimer(this);//隐藏的定时器
    mtimer->setTimerType(Qt::PreciseTimer);
    connect(mtimer, &QTimer::timeout, this, [=]() {
        if (opacityValue <= 0) 
        { 
            mtimer->stop();//关闭定时器
            this->close();
        }
        opacityValue = opacityValue - closeSpeed;
        this->setWindowOpacity(opacityValue);    //设置窗口透明度
    });


    QTimer *mShowtimer = new QTimer(this);//显示时间的定时器
    mShowtimer->setSingleShot(true);
    mShowtimer->setTimerType(Qt::PreciseTimer);// 修改定时器对象的精度
    connect(mShowtimer, &QTimer::timeout, this, [=]() {
        mtimer->start(closeTime);//执行延时自动关闭
    });
    mShowtimer->start(showTime);

    //设置屏幕居中显示
    QDesktopWidget* desktop = QApplication::desktop(); // =qApp->desktop();也可以
    this->move((desktop->width() - this->width()) / 2, (desktop->height() - this->height()) / 2);
    this->setAttribute(Qt::WA_TransparentForMouseEvents, true);// 禁止鼠标事件
}

void MessageTips::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setBrush(QBrush(backgroundColor));//窗体的背景色

    painter.setPen(QPen(frameColor, frameSize));//窗体边框的颜色和笔画大小
    QRectF rect(0, 0, this->width(), this->height());
    painter.drawRoundedRect(rect, 15, 15); // round rect
}




//设置关闭的时间和速度，speed大小限定0~1
void MessageTips::setCloseTimeSpeed(int closeTime, double closeSpeed)
{
    if (closeSpeed>0 && closeSpeed <= 1) {
        this->closeSpeed = closeSpeed;
    }
    this->closeTime = closeTime;
    InitLayout();
}


int MessageTips::getShowTime() const
{
    return showTime;
}

void MessageTips::setShowTime(int value)
{
    showTime = value;
    InitLayout();
}

int MessageTips::getFrameSize() const
{
    return frameSize;
}

void MessageTips::setFrameSize(int value)
{
    frameSize = value;
}

QColor MessageTips::getFrameColor() const
{
    return frameColor;
}

void MessageTips::setFrameColor(const QColor &value)
{
    frameColor = value;
}

QColor MessageTips::getBackgroundColor() const
{
    return backgroundColor;
}

void MessageTips::setBackgroundColor(const QColor &value)
{
    backgroundColor = value;
}

QColor MessageTips::getTextColor() const
{
    return textColor;
}

void MessageTips::setTextColor(const QColor &value)
{
    textColor = value;
    InitLayout();
}

int MessageTips::getTextSize() const
{
    return textSize;
}

void MessageTips::setTextSize(int value)
{
    textSize = value;
    InitLayout();
}

double MessageTips::getOpacityValue() const
{
    return opacityValue;
}

void MessageTips::setOpacityValue(double value)
{
    opacityValue = value;
    InitLayout();
}