QT 播放器之列表隐藏

大家好，又见面了，我是你们的朋友全栈君。

首先需要有一个按钮用来显示和隐藏列表

    m_button = new QPushButton(QStringLiteral("隐藏"),parent);
    m_button->resize(35,35);

当点击按钮的时候隐藏或显示列表

connect(m_button,&QPushButton::clicked,this,&HideShowListView::clickButton);

void HideShowListView::clickButton()
{
    if(m_list->isHidden())
    {
        m_list->show();
        m_button->setText(QStringLiteral("隐藏"));
    }
    else
    {
        m_list->hide();
        m_button->setText(QStringLiteral("显示"));
    }
}

列表显示的时候按钮位于列表左侧，隐藏的时候位于窗口右边

bool HideShowListView::eventFilter(QObject *watched, QEvent *event)
{
    if(m_list->isHidden())
    {
        if(event->type() == QEvent::Resize || event->type() == QEvent::Hide)
        {
            int x = m_parent->width()-5-m_button->width();
            int y = (m_parent->height()-m_button->height())/2;
            m_button->move(x,y);
            return false;
        }
    }
    else
    {
        if(event->type() == QEvent::Resize|| event->type() == QEvent::Show)
        {
            int x = m_list->pos().x()-m_button->width();
            int y = m_list->pos().y()+(m_list->height()-m_button->height())/2;
            m_button->move(x,y);
            return false;
        }
    }
   
    return QObject::eventFilter(watched,event);
}

为鼠标添加透明度动画

    QGraphicsOpacityEffect * effect = new QGraphicsOpacityEffect();
    m_button->setGraphicsEffect(effect);
    effect->setOpacity(0);

    m_animation = new QPropertyAnimation(effect,"opacity",this);
    m_animation->setDuration(100);

鼠标进入窗口的时候按钮需要显示，移动至窗口外面的时候需要隐藏

鼠标在窗口停止移动超过1.5秒，隐藏鼠标

鼠标移动的时候，显示鼠标

    if(event->type() == QEvent::HoverEnter && watched == m_parent)
    {
        m_animation->setStartValue(0);
        m_animation->setEndValue(0.99);
        m_animation->start();
        return false;
    }
    else if(event->type() == QEvent::HoverLeave && watched == m_parent)
    {
        m_animation->setStartValue(1.0);
        m_animation->setEndValue(0);
        m_animation->start();
        return false;
    }
    if(event->type() == QEvent::HoverMove)
    {
        if(m_timerId!=-1)
        {
            killTimer(m_timerId);
        }
        m_timerId = this->startTimer(1500);
        m_animation->setStartValue(m_animation->currentValue());
        m_animation->setEndValue(0.99);
        m_animation->start();
    }

void HideShowListView::timerEvent(QTimerEvent *event)
{
    if(event->timerId() == m_timerId)
    {
        m_animation->setStartValue(1.0);
        m_animation->setEndValue(0);
        m_animation->start();
        killTimer(m_timerId);
        m_timerId=-1;
    }
}

完整代码：

#ifndef HIDESHOWLISTVIEW_H
#define HIDESHOWLISTVIEW_H

#include <QObject>
#include <QSize>

QT_BEGIN_NAMESPACE
class QPushButton;
class QPropertyAnimation;
QT_END_NAMESPACE

class HideShowListView : public QObject
{
    Q_OBJECT
public:
    explicit HideShowListView(QWidget*list, QWidget *parent = nullptr);


    // QObject interface
public:
    bool eventFilter(QObject *watched, QEvent *event);

private slots:
    void clickButton();

private:
    int m_timerId=-1;
    QWidget*m_list;
    QPushButton *m_button;
    QWidget *m_parent;
    QPropertyAnimation *m_animation;

    // QObject interface
protected:
    void timerEvent(QTimerEvent *event);
};

#endif // HIDESHOWLISTVIEW_H

#include "hideshowlistview.h"
#include <QEvent>
#include <QPushButton>
#include <QStringLiteral>
#include <QWidget>
#include <QDebug>
#include <QPropertyAnimation>
#include <QGraphicsOpacityEffect>


HideShowListView::HideShowListView(QWidget *list, QWidget *parent) : QObject(parent)
{
    m_list = list;
    m_parent=parent;

    m_button = new QPushButton(QStringLiteral("隐藏"),parent);
    m_button->resize(35,35);

    QGraphicsOpacityEffect * effect = new QGraphicsOpacityEffect();
    m_button->setGraphicsEffect(effect);
    effect->setOpacity(0);

    m_animation = new QPropertyAnimation(effect,"opacity",this);
    m_animation->setDuration(100);

    list->installEventFilter(this);
    parent->installEventFilter(this);
    connect(m_button,&QPushButton::clicked,this,&HideShowListView::clickButton);
}

bool HideShowListView::eventFilter(QObject *watched, QEvent *event)
{
    if(m_list->isHidden())
    {
        if(event->type() == QEvent::Resize || event->type() == QEvent::Hide)
        {
            int x = m_parent->width()-5-m_button->width();
            int y = (m_parent->height()-m_button->height())/2;
            m_button->move(x,y);
            return false;
        }
    }
    else
    {
        if(event->type() == QEvent::Resize|| event->type() == QEvent::Show)
        {
            int x = m_list->pos().x()-m_button->width();
            int y = m_list->pos().y()+(m_list->height()-m_button->height())/2;
            m_button->move(x,y);
            return false;
        }
    }
    if(event->type() == QEvent::HoverEnter && watched == m_parent)
    {
        m_animation->setStartValue(0);
        m_animation->setEndValue(0.99);
        m_animation->start();
        return false;
    }
    else if(event->type() == QEvent::HoverLeave && watched == m_parent)
    {
        m_animation->setStartValue(1.0);
        m_animation->setEndValue(0);
        m_animation->start();
        return false;
    }
    if(event->type() == QEvent::HoverMove)
    {
        if(m_timerId!=-1)
        {
            killTimer(m_timerId);
        }
        m_timerId = this->startTimer(1500);
        m_animation->setStartValue(m_animation->currentValue());
        m_animation->setEndValue(0.99);
        m_animation->start();
    }
    return QObject::eventFilter(watched,event);
}

void HideShowListView::clickButton()
{
    if(m_list->isHidden())
    {
        m_list->show();
        m_button->setText(QStringLiteral("隐藏"));
    }
    else
    {
        m_list->hide();
        m_button->setText(QStringLiteral("显示"));
    }
}

void HideShowListView::timerEvent(QTimerEvent *event)
{
    if(event->timerId() == m_timerId)
    {
        m_animation->setStartValue(1.0);
        m_animation->setEndValue(0);
        m_animation->start();
        killTimer(m_timerId);
        m_timerId=-1;
    }
}