之前一段时间，因为项目需要学习了Android开发，其中有个Toast的控件，又恰巧在Qt中需要一个类似的东西，于是想着好好做一个实现，后续同样的场景时就可以复用了。首先看一下效果图：
效果图上卡顿比较明显，实际的效果要好得多。
以下是代码，注释都在代码中，不废话了。
#ifndef TOAST_H
#define TOAST_H
#include <QDialog>
#include <QMouseEvent>
#include <QTimer>
#include <QVBoxLayout>
#include <QLabel>
#include <QApplication>
#include <QDebug>
#include <QScreen>
#include <QMovie>
#include <QGraphicsOpacityEffect>
#include <QPropertyAnimation>
/*
* CToast : 仿Android中Toast控件，用于弹出任意Widget，
* 常见用法如弹出一个文字提示，图片，GIF等，并于特定时间后自动隐藏
*
* 类中提供了三个静态函数分别用于显示文本，图片和GIF。如有其他需要可以参照这些静态函数自行修改。
*/
class CToast : public QDialog
{
Q_OBJECT
public:
CToast(QWidget *parent = nullptr);
~CToast();
/*
* SetWidget:设置要展示的Widget窗口，默认为nullptr
*/
void SetWidget(QWidget *widget);
/*
* SetDisplayTime:设置 CToast 的显示时间，超过这个时间，窗口自动隐藏，单位：毫秒
*
* 默认为 -1 ，也就是不会自动消失
*
* 如果设置了正值的显示时间，隐藏窗口的时候，会自动根据SetAnimation的值来决定是否开启隐藏动画
*/
void SetDisplayTime(int mSecs);
/*
* SetAnimation:显示和隐藏窗口时，是否采用动画，而不是直接显示和消失
*
* 默认为 true ，也就是使用动画，显示时，应该调用StartShowAnimation()
*/
void SetAnimation(bool show);
/*
* SetDeleteWhenHide:设置窗口隐藏时是否自动删除CToast,默认为false
*
* 这个方法，主要是用于静态函数中的，此时用于不会获取CToast的指针，所以需要自动删除掉
* 如果用户不是使用静态函数，而是需要自已 new 出一个 CToast 的，则最好不要用这个函数
*/
void SetDeleteWhenHide(bool deleteWhenHide);
/*
* MoveToPercentage:将CToast的中点移动到指定的位置，参数hPer和vPer表示百分比。
*
* 如果CToast的parent为一个Widget，那么它的位置是相对于parent widget的
* 如果CToast的parent为nullptr，那么它的位置是相对于电脑的主屏幕的
*
* 如果取值为0~1.0，那么CToast会自动移动到指定的百分比点，如果其中有任意一个设置为负数，
* 那么，不会自动移动，此时需要用户去调用 QWidget::move()来指定位置。
*
* MoveToCenter 即为 MoveToPercentage(0.5,0.5);
*
* 默认会调用MoveToPercentage(-1,-1),也就是不开启自动移动
*/
void MoveToCenter();
void MoveToPercentage(qreal hPer,qreal vPer);
public slots:
void StartShowAnimation();
void StartHideAnimation();
protected:
void showEvent(QShowEvent *event);
void hideEvent(QHideEvent *event);
private:
void Init();
void InitAnimation();
void SetDelaySeconds(int mSecs);
void MovePostion();
QWidget *m_pCentralWidget;
qreal m_dHPer,m_dVPer;
int m_nDisplayTimeByMSecs;
bool m_bShowAnimation;
bool m_bDeleteWhenHide;
QPropertyAnimation *m_pHideAnimation;
QPropertyAnimation *m_pShowAnimation;
public:
static void ShowText(const QString &text,int displayTimeByMSec = 5000,
double hPercentage = 0.5,double vPercentage = 0.8,QWidget *parent = nullptr)
{
QFont iFont;
iFont.setPixelSize(24);
QLabel *pLabel = new QLabel;
pLabel->setFrameStyle(QFrame::Panel);
pLabel->setAlignment(Qt::AlignCenter);
pLabel->setFont(iFont);
pLabel->setWordWrap(true);
pLabel->setText(text);
QString qss = "background-color:transparent;"
"border:none;"
"color:#27408B;";
pLabel->setStyleSheet(qss);
CToast *iToast = new CToast(parent);
QFontMetrics metrics(iFont);
QRect rect = metrics.boundingRect(QRect(0,0,pLabel->maximumWidth(),pLabel->maximumHeight()),
Qt::AlignCenter|Qt::TextWordWrap,text);
iToast->resize(rect.size()+QSize(metrics.width("A"),0));
iToast->SetWidget(pLabel);
iToast->SetDisplayTime(displayTimeByMSec);
iToast->SetDeleteWhenHide(true);
iToast->MoveToPercentage(hPercentage,vPercentage);
iToast->StartShowAnimation();
}
static void ShowPixmap(const QPixmap &pixmap,int displayTimeByMSec = 5000,
double hPercentage = 0.5,double vPercentage = 0.8,QWidget *parent = nullptr)
{
if(pixmap.isNull())
{
ShowText(u8"pixmap为NULL，无法显示图片!",displayTimeByMSec,hPercentage,vPercentage,parent);
return;
}
QLabel *pLabel = new QLabel;
pLabel->setFrameStyle(QFrame::Panel);
pLabel->setAlignment(Qt::AlignCenter);
pLabel->setPixmap(pixmap);
CToast *iToast = new CToast(parent);
iToast->resize(pixmap.size());
iToast->SetWidget(pLabel);
iToast->SetDisplayTime(displayTimeByMSec);
iToast->SetDeleteWhenHide(true);
iToast->MoveToPercentage(hPercentage,vPercentage);
iToast->StartShowAnimation();
}
static void ShowMoive(QMovie *movie,double hPercentage = 0.5,double vPercentage = 0.8,
QWidget *parent = nullptr)
{
if((movie == nullptr) || !movie->isValid())
{
ShowText(u8"movie为nullptr或无效，无法显示Gif!",5000,hPercentage,vPercentage,parent);
return;
}
QLabel *pLabel = new QLabel;
pLabel->setFrameStyle(QFrame::Panel);
pLabel->setAlignment(Qt::AlignCenter);
pLabel->setMovie(movie);
CToast *iToast = new CToast(parent);
iToast->resize(QPixmap(movie->fileName()).size());
iToast->SetWidget(pLabel);
iToast->SetDisplayTime(-1);
iToast->SetDeleteWhenHide(true);
iToast->MoveToPercentage(hPercentage,vPercentage);
iToast->StartShowAnimation();
movie->start();
if(iToast->m_bShowAnimation)
{
QObject::connect(movie,SIGNAL(finished()),iToast,SLOT(StartHideAnimation()));
}
else
{
QObject::connect(movie,SIGNAL(finished()),iToast,SLOT(hide()));
}
}
};
#endif // TOAST_H#include "Toast.h"
CToast::CToast(QWidget *parent)
:QDialog (parent)
{
m_pCentralWidget = nullptr;
m_pHideAnimation = nullptr;
m_pShowAnimation = nullptr;
m_bShowAnimation = true;
m_bDeleteWhenHide = false;
m_nDisplayTimeByMSecs = -1;
m_dHPer = -1;
m_dVPer = -1;
Init();
InitAnimation();
}
CToast::~CToast()
{
if(m_pHideAnimation)
m_pHideAnimation->deleteLater();
if(m_pShowAnimation)
m_pShowAnimation->deleteLater();
if(m_pCentralWidget)
{
m_pCentralWidget->setParent(nullptr);
m_pCentralWidget->deleteLater();
}
}
void CToast::SetWidget(QWidget *widget)
{
if(nullptr == widget)
return;
if(m_pCentralWidget)
{
m_pCentralWidget->setParent(nullptr);
m_pCentralWidget->deleteLater();
}
QVBoxLayout *iMainLayout = new QVBoxLayout;
iMainLayout->setMargin(0);
iMainLayout->setSpacing(0);
m_pCentralWidget = widget;
iMainLayout->addWidget(m_pCentralWidget);
this->setLayout(iMainLayout);
}
void CToast::SetDisplayTime(int mSecs)
{
m_nDisplayTimeByMSecs = mSecs;
}
void CToast::SetAnimation(bool show)
{
m_bShowAnimation = show;
}
void CToast::SetDeleteWhenHide(bool deleteWhenHide)
{
m_bDeleteWhenHide = deleteWhenHide;
}
void CToast::MoveToCenter()
{
m_dHPer = 0.5;
m_dVPer = 0.5;
}
void CToast::MoveToPercentage(qreal hPer, qreal vPer)
{
m_dHPer = (hPer < 0) ? -1 : ((hPer > 1.0) ? 1.0 : hPer);
m_dVPer = (vPer < 0) ? -1 : ((vPer > 1.0) ? 1.0 : vPer);
}
void CToast::Init()
{
if(nullptr == this->parentWidget())
{
this->setWindowFlags(Qt::FramelessWindowHint|Qt::Tool);
}
else
{
this->setWindowFlags(Qt::FramelessWindowHint);
}
this->setAttribute(Qt::WA_AlwaysStackOnTop,true);
this->setAttribute(Qt::WA_TranslucentBackground,true);
}
void CToast::InitAnimation()
{
QGraphicsOpacityEffect *pOpacityEffect = new QGraphicsOpacityEffect(this);
pOpacityEffect->setOpacity(0.0);
this->setGraphicsEffect(pOpacityEffect);
m_pHideAnimation = new QPropertyAnimation(pOpacityEffect, "opacity",this);
m_pHideAnimation->setEasingCurve(QEasingCurve::Linear);
m_pHideAnimation->setDuration(1200);
m_pHideAnimation->setEndValue(0);
m_pShowAnimation = new QPropertyAnimation(pOpacityEffect, "opacity",this);
m_pShowAnimation->setEasingCurve(QEasingCurve::Linear);
m_pShowAnimation->setDuration(1200);
m_pShowAnimation->setEndValue(1.0);
connect(m_pHideAnimation,SIGNAL(finished()),this,SLOT(hide()));
}
void CToast::SetDelaySeconds(int mSecs)
{
if(mSecs > 0)
{
if(m_bShowAnimation)
{
QTimer::singleShot(mSecs,this,SLOT(StartHideAnimation()));
}
else
{
QTimer::singleShot(mSecs,this,SLOT(hide()));
}
}
}
void CToast::MovePostion()
{
qreal hPer = m_dHPer;
qreal vPer = m_dVPer;
if(hPer == -1 || vPer == -1)
return;
int pWidth,pHeight;
QWidget *parentWidget = this->parentWidget();
if(nullptr != parentWidget)
{
pWidth = this->parentWidget()->width();
pHeight = this->parentWidget()->height();
}
else
{
pWidth = QApplication::primaryScreen()->size().width();
pHeight = QApplication::primaryScreen()->size().height();
}
this->move(pWidth*hPer - this->width()*0.5,pHeight*vPer - this->height()*0.5);
}
void CToast::StartShowAnimation()
{
this->setVisible(true);
m_pShowAnimation->start();
}
void CToast::StartHideAnimation()
{
m_pHideAnimation->start();
}
void CToast::showEvent(QShowEvent *event)
{
MovePostion();
QDialog::showEvent(event);
this->SetDelaySeconds(m_nDisplayTimeByMSecs);
}
void CToast::hideEvent(QHideEvent *event)
{
QDialog::hideEvent(event);
if(m_bDeleteWhenHide)
{
this->deleteLater();
}
}