自己開發了一個股票智慧分析軟體，功能很強大，需要的點選下面的連結獲取：

https://www.cnblogs.com/bclshuai/p/11380657.html

Qt動畫

目錄

1 簡介

1.1 Qt動畫類介紹

2 基礎動畫實現

2.1 Qt控制元件大小縮放和位置變化

2.2 透明度控制隱藏和顯示

2.3 並行動畫

2.4 序列動畫

2.5 動畫執行方向設定

2.6 動畫迴圈次數設定

2.7 動畫執行結束的操作

3 Qt的高階動畫應用

3.1 Qt自定義動畫屬性實現背景色透明度動畫

3.2 Tab條選擇跟隨移動

3.2.1 應用場景說明

3.2.2 實現方法

3.3 Qt實現數字滾動動畫效果

3.3.1 應用場景說明

3.3.2 實現方法

4 附錄

4.1 Qt動畫QEasingCurve的速度曲線

1 簡介

1.1 Qt動畫類介紹

類名	功能介紹
QAbstractAnimation 動畫基類	提供基本的動畫屬性和介面，它有兩個子類QVariantAnimation 和QAnimationGroup。QAbstractAnimation是其他所有類的父類。它提供了基礎的屬性，適用於所有的本框架下的動畫。
QPropertyAnimation 實際的動畫類	，實現了一個Qt動畫屬性，比如對控制元件的大小縮放、位置移動、透明度變化的動畫效果實現。修改的屬性一定是類具有的屬性，類中要有屬性定義Q_PROPERTY(QRect geometry READ geometry WRITE setGeometry)，否則要宣告屬性，並實踐READ和WRITE方法。
QParallelAnimationGroup 並行動畫類	將多個屬性動畫QPropertyAnimation新增到一個QParallelAnimationGroup，實現並行執行動畫。
QSequentialAnimationGroup 序列動畫類	QSequentialAnimationGroup，將多個QPropertyAnimation串聯在一起實現，按照新增順序先後執行動畫。
QPauseAnimation停頓類	在序列動畫中，新增一個暫停的動畫，可以實現延時效果。
QEasingCurve速度曲線類	Qt動畫運動的速度曲線，枚舉了45種，詳見附錄。

2 基礎動畫實現

2.1 Qt控制元件大小縮放和位置變化

通過修改geometry屬性實現座標和大小的動畫效果。通過建立QPropertyAnimation物件，關聯widget控制元件ui.widgetProcess，設定屬性geometry。QRect（x，y，width，hight），通過設定x，y改變位置，通過設定width和hight來改變大小。如下圖所示，相似度widget向上移動同時隱藏。進度顯示widget視窗從下往上移動，從隱藏到顯示。

下面是座標控制

QPropertyAnimation * pWidgetProcessUp = new QPropertyAnimation(ui.widgetProcess, "geometry");

pWidgetProcessUp->setDuration(300);//設定動畫執行時間，單位毫秒

pWidgetProcessUp->setStartValue(QRect(140, 688, 534, 48));//初始值

pWidgetProcessUp->setEndValue(QRect(140, 668, 534, 48));//結束值

pWidgetProcessUp->setEasingCurve(QEasingCurve::Linear);設定速度曲線

pWidgetProcessUp->start(QAbstractAnimation::DeleteWhenStopped);//執行動畫，結束後刪除物件

2.2 透明度控制隱藏和顯示

因為qt控制元件沒有透明度屬性opacity，所以需要通過QGraphicsOpacityEffect實現控制元件繪圖效果實現透明度改變

標頭檔案定義

QGraphicsOpacityEffect* m_widgetProcessOpacity;

建構函式中定義

m_widgetProcessOpacity=new QGraphicsOpacityEffect (ui.widgetProcess);//建立QGraphicsOpacityEffect物件關聯控制元件ui.widgetProcess

m_widgetProcessOpacity->setOpacity(0);//設定透明度為0，隱藏控制元件

ui.widgetProcess->setGraphicsEffect(m_widgetProcessOpacity);//控制元件新增繪圖效果

函式中使用

QPropertyAnimation* pWidgetProcessOpacity = new QPropertyAnimation(m_widgetProcessOpacity, "opacity", ui.widgetProcess);

pWidgetProcessOpacity->setDuration(300);

pWidgetProcessOpacity->setStartValue(0);

pWidgetProcessOpacity->setEndValue(1);

pWidgetProcessOpacity->setEasingCurve(QEasingCurve::Linear);

pWidgetProcessOpacity->start(QAbstractAnimation::DeleteWhenStopped);//執行動畫，結束後刪除物件。

2.3 並行動畫

實際使用中需要將多個控制元件的屬性動畫一起執行，實現豐富的動畫效果，將多個屬性動畫QPropertyAnimation新增到一個QParallelAnimationGroup，實現並行執行動畫。例如將上面的兩個動畫合併，同時改變控制元件ui.widgetProcess的位置、大小、透明度。

QParallelAnimationGroup* pParaTwo = new QParallelAnimationGroup(this);

pParaTwo->addAnimation(pWidgetProcessUp);

pParaTwo->addAnimation(pWidgetProcessOpacity);

pParaTwo-> start(QAbstractAnimation::DeleteWhenStopped);//執行後刪除

2.4 序列動畫

可以實現同一個控制元件的不同屬性變化序列，也可以實現多個控制元件的序列動畫。還可以在動畫之間新增暫停動畫QPauseAnimation，實現延時的效果。

QSequentialAnimationGroup* pSequenAno = new QSequentialAnimationGroup(this);

//透明度從0變為1，顯示出來；

pSequenAno->addAnimation(pWidgetProcessOpacity);

//暫停一秒

QPauseAnimation *pPauseAnimation = new QPauseAnimation(this);

pPauseAnimation->setDuration(1000);

//再向上移動

pSequenAno->addAnimation(pWidgetProcessUp);

pSequenAno->start(QAbstractAnimation::DeleteWhenStopped);

2.5 動畫執行方向設定

Qt動畫執行可以設定執行方向，為正向Forward和方向Backward，例如透明度變化正向是初始值setStartValue(0);結束值設定setEndValue(1);控制元件從隱藏到顯示。可以設定動畫執行方向為反向，pWidgetProcessOpacity –>s etDirection(QAbstractAnimation::Backward)，這樣就可以執行顯示到隱藏的動畫。動畫的執行一般是雙向的，可以通過方向控制，避免建立反向的動畫流程。

enum Direction {

Forward,

Backward

};

2.6 動畫迴圈次數設定

有時需要執行動畫多次，或者無限迴圈下去，可以設定動畫迴圈次數。設定為-1時表示無限迴圈。

void setLoopCount(int loopCount);

2.7 動畫執行結束的操作

動畫結束之後執行一些清理工作，或者屬性設定工作，可以連線QAbstractAnimation::finished訊號，動畫結束之後再執行一些操作。也可以將動畫物件的清理放入槽函式中。這樣就不能start(QAbstractAnimation::DeleteWhenStopped);

connect(pSequenAno, &QAbstractAnimation::finished, [=]() {

ui.pushButtonAddVideo->setDisabled(true);

ui.pushButtonDelVideo->setDisabled(true);

ui.pushButtonAddPic->setDisabled(true);

ui.pushButtonDelPic->setDisabled(true);

PausePlayVedio(1, 0);//先建立索引，準確時間定位

});

3 Qt的高階動畫應用

3.1 Qt自定義動畫屬性實現背景色透明度動畫

自定義一個背景色透明度的屬性，在定義get和set方法，在set方法中去通過setstytlesheet去設定背景色的透明度。

Q_PROPERTY(int alpha READ alpha WRITE setAlpha)

動畫執行的過程中，通過set方法動態的設定背景色透明度。可以通過setKeyValueAt函式設定關鍵點的取值，step取值範圍是0~1，可以設定幾個值。動畫執行過程中就會在這個幾個值之間切換。

void setKeyValueAt(qreal step, const QVariant &value);

標頭檔案實現

#ifndef MAIN_WINDOW_H

#define MAIN_WINDOW_H

...

class MainWindow : public CustomWindow

{

Q_OBJECT

Q_PROPERTY(int alpha READ alpha WRITE setAlpha)

public:

explicit MainWindow(QWidget *parent = 0);

~MainWindow();

private:

int alpha() const;

void setAlpha(const int alpha);

private:

int m_nAlpha;

QLabel *m_pLabel;

};

#endif // MAIN_WINDOW_H

原始檔實現

#include "main_window.h"

MainWindow::MainWindow(QWidget *parent)

: CustomWindow(parent)

{

...

QPushButton *pStartButton = new QPushButton(this);

pStartButton->setText(QString::fromLocal8Bit("開始動畫"));

m_pLabel = new QLabel(this);

m_pLabel->setText(QString::fromLocal8Bit("一去丶二三裡"));

m_pLabel->setAlignment(Qt::AlignCenter);

m_pLabel->setStyleSheet("color: rgb(0, 160, 230);");

QPropertyAnimation *pAnimation = new QPropertyAnimation();

pAnimation->setTargetObject(this);

pAnimation->setPropertyName("alpha");

pAnimation->setDuration(1000);

pAnimation->setKeyValueAt(0, 255);

pAnimation->setKeyValueAt(0.5, 100);

pAnimation->setKeyValueAt(1, 255);

pAnimation->setLoopCount(-1); //永遠執行，直到stop

connect(pStartButton, SIGNAL(clicked(bool)), pAnimation, SLOT(start()));

...

}

int MainWindow::alpha() const

{

return m_nAlpha;

}

void MainWindow::setAlpha(const int alpha)

{

m_nAlpha = alpha;

QString strQSS = QString("color: rgb(0, 160, 230); ").arg(m_nAlpha);

m_pLabel->setStyleSheet(strQSS);

}

注意事項：

(1)需要用QVariantAnimation檢測你自定義的QVariant型別是否支援。

(2)宣告屬性的類必須是一個QObject，必須為屬性提供一個setter（這樣，QPropertyAnimation才可以設定屬性的值）。

3.2 Tab條選擇跟隨移動

3.2.1 應用場景說明

如下圖所示，初始狀態，tab條在第一張圖片下方，當滑鼠放入第三張圖片上時，觸發了hover訊號，tab條則會延長到第三張圖片。如果單擊第三張圖片，tab條則會切換到第三張圖片，如果沒有單擊則失去hover時，tab條還原到第一張圖片。從而實現選擇切換的動畫顯示。

3.2.2 實現方法

（1） 現在圖片顯示的自定義widget類中重寫滑鼠進入、離開、單擊的函式，自定義三種訊號，滑鼠進入、離開、點選時觸發訊號傳遞到外面。

signals:

void signalPicClicked();//滑鼠單擊訊號

void signalEnterPicWidget();

void signalLeavePicWidget();

protected:

void enterEvent(QEvent *e); //進入QWidget瞬間事件

void leaveEvent(QEvent *e); //離開QWidget瞬間事件

void mousePressEvent(QMouseEvent* e);

void enterEvent(QEvent *e); //進入QWidget瞬間事件

void leaveEvent(QEvent *e); //離開QWidget瞬間事件

（2） 將三種訊號進行連線

for (int i = 0; i < 4; i++)

{

//滑鼠進入訊號繫結

connect(&m_Pic[i], &PicWidget::signalEnterPicWidget, this, [=]() {

//延長tab條到當前index

int iCurrentPosX = 164;

if (i != m_iCurrentPicIndex)//不是當前圖片索引時才去延長

{

if (i == 0)

{

iCurrentPosX = 164;

}

else if (i == 1)

{

iCurrentPosX = 268;

}

else if (i == 2)

{

iCurrentPosX = 372;

}

else if (i == 3)

{

iCurrentPosX = 476;

}

QPropertyAnimation * linelength = new QPropertyAnimation(ui.line, "geometry");

linelength->setDuration(300);

QRect rect = ui.line->geometry();

linelength->setStartValue(rect);

linelength->setEasingCurve(QEasingCurve::Linear);

if (i<m_iCurrentPicIndex)//hover觸發的圖片在當前圖片左邊，x發生變化，同時長度向左延伸

{

linelength->setEndValue(QRect(iCurrentPosX, rect.top(), 32+ abs(i - m_iCurrentPicIndex) * 104, rect.height()));

}

else//hover觸發的圖片在當前圖片右邊，x不需要變化，長度向右延伸

{

linelength->setEndValue(QRect(m_iCurrentPosX, rect.top(), 32 + abs(i - m_iCurrentPicIndex) * 104, rect.height()));

}//執行動畫

linelength->start(QAbstractAnimation::DeleteWhenStopped);

}

});

//滑鼠放入之後沒有點選而是離開了。還原位置

connect(&m_Pic[i], &PicWidget::signalLeavePicWidget, this, [=]() {

QPropertyAnimation * linelength = new QPropertyAnimation(ui.line, "geometry");

linelength->setDuration(300);

QRect rect = ui.line->geometry();

linelength->setStartValue(rect);

linelength->setEasingCurve(QEasingCurve::Linear);

if (i >m_iCurrentPicIndex)//座標改變，同時向右延伸

{

linelength->setEndValue(QRect(m_iCurrentPosX, rect.top(),32, 4));

}

else//座標不變只改變長度

{

linelength->setEndValue(QRect(m_iCurrentPosX, rect.top(),32, 4));

}

linelength->start(QAbstractAnimation::DeleteWhenStopped);

});

//滑鼠單擊後，切換位置，並且修改當前圖片索引和當前位置值

connect(&m_Pic[i], &PicWidget::signalPicClicked, this, [=]() {

QPropertyAnimation * linelength = new QPropertyAnimation(ui.line, "geometry");

linelength->setDuration(300);

QRect rect = ui.line->geometry();

linelength->setStartValue(rect);

linelength->setEasingCurve(QEasingCurve::Linear);

if (i==0)

{

m_iCurrentPosX = 164;

}

else if (i==1)

{

m_iCurrentPosX = 268;

}

else if (i==2)

{

m_iCurrentPosX = 372;

}

else if (i==3)

{

m_iCurrentPosX = 476;

}

if (i>m_iCurrentPicIndex)

{

linelength->setEndValue(QRect(m_iCurrentPosX, rect.top(), 32, 4));//

}

else

{

linelength->setEndValue(QRect(m_iCurrentPosX, rect.top(), 32, 4));//

}

linelength->start(QAbstractAnimation::DeleteWhenStopped);

m_iCurrentPicIndex = i;

if (m_Pic[i].getPath()!="")

{

SourcePicChanged(m_Pic[i].getPath());

}

});

}

3.3 Qt實現數字滾動動畫效果

3.3.1 應用場景說明

如下圖所示，需要顯示人臉檢測的數量，變動畫的方式實現個位數字滾動，個位由9變成0時，十位也要滾動，實現進位。當個位十位都是9時，數字不在增加，而是顯示加號+。

3.3.2 實現方法

實現方案，個位十位都有上下兩個label顯示數字。通過QPropertyAnimation屬性動畫控制兩個label位置同時向上。動畫結束後，再將兩個label還原到原始位置。在還原位置之前，先前上面的labelnum值設定為下面labelnum1的值，下面labelnum1的值設定為+1後的值，避免出現數字閃現變小的問題。

標頭檔案實現

#ifndef NUMSHOWWIDGET_H

#define NUMSHOWWIDGET_H

#include <QPropertyAnimation>

#include<QParallelAnimationGroup>

#include <QSequentialAnimationGroup>

#include <QWidget>

#include"ui_NumShowWidget.h"

class NumShowWidget : public QWidget

{

Q_OBJECT

public:

NumShowWidget();

~NumShowWidget();

void initNum();//個位十位上下初始化0，1值

/*

設定為某個值，會根據數字增量的大小增加數字值，根據time求出平均動畫時間步長。增量大時速度快，增量小時速度慢

*/

void setNum(int num,int time);

void addNum(int num, int time);

private:

Ui::NumShowWidget ui;

int m_tenwei = 0;//十位

int m_gewei = 0;//個位

QLabel* m_tenCurrent = NULL;//十位當前label

QLabel* m_tenDown=NULL;//十位下面的label

QLabel* m_geCurrent = NULL;//個位當前label

QLabel* m_geDown = NULL;//個位下面的label

int m_count = 0;//動畫執行的次數，增量為10，則執行十次上滾動畫

int m_num=0;//儲存當前顯示的數字。

QParallelAnimationGroup* tenAnimation;

};

#endif // NUMSHOWWIDGET_H

原始檔實現

#include "NumShowWidget.h"

NumShowWidget::NumShowWidget()

{

ui.setupUi(this);

setWindowModality(Qt::NonModal);

setWindowFlags(Qt::FramelessWindowHint);

this->resize(32, 32);

m_tenCurrent = ui.labelten;

m_tenDown = ui.labelten1;

m_tenCurrent->setText("0");

m_tenDown->setText("1");

m_geCurrent = ui.labelnum;

m_geCurrent->setText("0");

m_geDown = ui.labelnum1;

m_geDown->setText("1");

ui.labelplus->hide();

tenAnimation = new QParallelAnimationGroup(this);

QPropertyAnimation * tenCurrent = new QPropertyAnimation(m_tenCurrent, "geometry");

tenCurrent->setDuration(100);

tenCurrent->setStartValue(QRect(4, 0, 12, 32));

tenCurrent->setEndValue(QRect(4, -32, 12, 32));

tenAnimation->addAnimation(tenCurrent);

QPropertyAnimation * tenDown = new QPropertyAnimation(m_tenDown, "geometry");

tenDown->setDuration(100);

tenDown->setStartValue(QRect(4, 32, 12, 32));

tenDown->setEndValue(QRect(4, 0, 12, 32));

tenAnimation->addAnimation(tenDown);

connect(tenAnimation, &QAbstractAnimation::finished, this, [=]() {

m_tenCurrent->setText(QString::number(m_tenwei++));

m_tenCurrent->setGeometry(4, 0, 12, 32);

m_tenCurrent->raise();

m_tenDown->setGeometry(4, 32, 12, 32);

m_tenDown->setText(QString::number((m_tenwei + 1)));

});

}

NumShowWidget::~NumShowWidget()

{

if (tenAnimation != NULL)

{

delete tenAnimation;

tenAnimation = NULL;

}

}

void NumShowWidget::initNum()

{

m_tenwei = 1;

m_gewei = 1;

m_num = 0;

m_tenCurrent->setText("0");

m_tenCurrent->setGeometry(QRect(4, 0, 12, 32));

m_tenDown->setText("1");

m_tenDown->setGeometry(QRect(4, 32, 12, 32));

m_geCurrent->setText("0");

m_geDown->setText("1");

m_geCurrent->setGeometry(QRect(15, 0, 12, 32));

m_geDown->setGeometry(QRect(15, 32, 12, 32));

ui.labelplus->hide();

}

void NumShowWidget::setNum(int num, int time)

{

if (num > 99)

{

if (m_num < 99)

{

addNum(99 - m_num, time);

m_num =num;

}

else

{

ui.labelplus->show();

}

}

else

{

addNum(num - m_num, time);

m_num = num;

}

}

void NumShowWidget::addNum(int num, int time)

{

if (num <= 0)

{

return;

}

int steptime = time / num;//動畫時間步長

m_count = num;

QParallelAnimationGroup* paraAnimation = new QParallelAnimationGroup(this);

QPropertyAnimation * geCurrent = new QPropertyAnimation(m_geCurrent, "geometry");

geCurrent->setDuration(steptime);

geCurrent->setStartValue(QRect(15, 0, 12, 32));

geCurrent->setEndValue(QRect(15, -32, 12, 32));

paraAnimation->addAnimation(geCurrent);

QPropertyAnimation *geDown = new QPropertyAnimation(m_geDown, "geometry");

geDown->setDuration(steptime);

geDown->setStartValue(QRect(15, 32, 12, 32));

geDown->setEndValue(QRect(15, 0, 12, 32));

paraAnimation->addAnimation(geDown);

paraAnimation->start();

connect(paraAnimation, &QAbstractAnimation::finished, this, [=]() {

m_count--;

m_geCurrent->setText(QString::number(m_gewei++));

m_geCurrent->setGeometry(15, 0, 12, 32);

m_geCurrent->raise();

m_geDown->setGeometry(15, 32, 12, 32);

if (m_gewei >= 10)

{

if (m_tenwei < 10)

{

tenAnimation->start();//十位進一位

}

m_gewei = 0;

}

m_geDown->setText(QString::number((m_gewei) % 10));

if (m_count > 0)

{

paraAnimation->start();

}

else

{

delete paraAnimation;

}

});

}

4 附錄

4.1 Qt動畫QEasingCurve的速度曲線

Constant	Value	Description
QEasingCurve::Linear	0	Easing curve for a linear (t) function: velocity is constant.
QEasingCurve::InQuad	1	Easing curve for a quadratic (t^2) function: accelerating from zero velocity.
QEasingCurve::OutQuad	2	Easing curve for a quadratic (t^2) function: decelerating to zero velocity.
QEasingCurve::InOutQuad	3	Easing curve for a quadratic (t^2) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInQuad	4	Easing curve for a quadratic (t^2) function: deceleration until halfway, then acceleration.
QEasingCurve::InCubic	5	Easing curve for a cubic (t^3) function: accelerating from zero velocity.
QEasingCurve::OutCubic	6	Easing curve for a cubic (t^3) function: decelerating to zero velocity.
QEasingCurve::InOutCubic	7	Easing curve for a cubic (t^3) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInCubic	8	Easing curve for a cubic (t^3) function: deceleration until halfway, then acceleration.
QEasingCurve::InQuart	9	Easing curve for a quartic (t^4) function: accelerating from zero velocity.
QEasingCurve::OutQuart	10	Easing curve for a quartic (t^4) function: decelerating to zero velocity.
QEasingCurve::InOutQuart	11	Easing curve for a quartic (t^4) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInQuart	12	Easing curve for a quartic (t^4) function: deceleration until halfway, then acceleration.
QEasingCurve::InQuint	13	Easing curve for a quintic (t^5) easing in: accelerating from zero velocity.
QEasingCurve::OutQuint	14	Easing curve for a quintic (t^5) function: decelerating to zero velocity.
QEasingCurve::InOutQuint	15	Easing curve for a quintic (t^5) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInQuint	16	Easing curve for a quintic (t^5) function: deceleration until halfway, then acceleration.
QEasingCurve::InSine	17	Easing curve for a sinusoidal (sin(t)) function: accelerating from zero velocity.
QEasingCurve::OutSine	18	Easing curve for a sinusoidal (sin(t)) function: decelerating from zero velocity.
QEasingCurve::InOutSine	19	Easing curve for a sinusoidal (sin(t)) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInSine	20	Easing curve for a sinusoidal (sin(t)) function: deceleration until halfway, then acceleration.
QEasingCurve::InExpo	21	Easing curve for an exponential (2^t) function: accelerating from zero velocity.
QEasingCurve::OutExpo	22	Easing curve for an exponential (2^t) function: decelerating from zero velocity.
QEasingCurve::InOutExpo	23	Easing curve for an exponential (2^t) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInExpo	24	Easing curve for an exponential (2^t) function: deceleration until halfway, then acceleration.
QEasingCurve::InCirc	25	Easing curve for a circular (sqrt(1-t^2)) function: accelerating from zero velocity.
QEasingCurve::OutCirc	26	Easing curve for a circular (sqrt(1-t^2)) function: decelerating from zero velocity.
QEasingCurve::InOutCirc	27	Easing curve for a circular (sqrt(1-t^2)) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInCirc	28	Easing curve for a circular (sqrt(1-t^2)) function: deceleration until halfway, then acceleration.
QEasingCurve::InElastic	29	Easing curve for an elastic (exponentially decaying sine wave) function: accelerating from zero velocity. The peak amplitude can be set with theamplitudeparameter, and the period of decay by theperiodparameter.
QEasingCurve::OutElastic	30	Easing curve for an elastic (exponentially decaying sine wave) function: decelerating from zero velocity. The peak amplitude can be set with theamplitudeparameter, and the period of decay by theperiodparameter.
QEasingCurve::InOutElastic	31	Easing curve for an elastic (exponentially decaying sine wave) function: acceleration until halfway, then deceleration.
QEasingCurve::OutInElastic	32	Easing curve for an elastic (exponentially decaying sine wave) function: deceleration until halfway, then acceleration.
QEasingCurve::InBack	33	Easing curve for a back (overshooting cubic function: (s+1)*t^3 - s*t^2) easing in: accelerating from zero velocity.
QEasingCurve::OutBack	34	Easing curve for a back (overshooting cubic function: (s+1)*t^3 - s*t^2) easing out: decelerating to zero velocity.
QEasingCurve::InOutBack	35	Easing curve for a back (overshooting cubic function: (s+1)*t^3 - s*t^2) easing in/out: acceleration until halfway, then deceleration.
QEasingCurve::OutInBack	36	Easing curve for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing out/in: deceleration until halfway, then acceleration.
QEasingCurve::InBounce	37	Easing curve for a bounce (exponentially decaying parabolic bounce) function: accelerating from zero velocity.
QEasingCurve::OutBounce	38	Easing curve for a bounce (exponentially decaying parabolic bounce) function: decelerating from zero velocity.
QEasingCurve::InOutBounce	39	Easing curve for a bounce (exponentially decaying parabolic bounce) function easing in/out: acceleration until halfway, then deceleration.
QEasingCurve::OutInBounce	40	Easing curve for a bounce (exponentially decaying parabolic bounce) function easing out/in: deceleration until halfway, then acceleration.
QEasingCurve::Custom	45	This is returned if the user specified a custom curve type withsetCustomType(). Note that you cannot callsetType() with this value, buttype() can return it.