qt-各种惊艳动画实例_qt动画

一、演示效果

二、关键代码

#include "bounceindicator.h"

#include <QPainter>
#include <QPropertyAnimation>
#include <QParallelAnimationGroup>
#include <QTime>

inline QColor randomColor()
{
    srand(QTime::currentTime().msecsSinceStartOfDay());
    return QColor(qrand() % 255, qrand() % 255, qrand() % 255);
}

static const QSize ItemSize = QSize(30, 30);
static const int TopMargin = 10;
static const int BounceDuration = 200;
static const QEasingCurve::Type EasingCurve = QEasingCurve::Linear;

class BounceItem : public QWidget
{
    Q_OBJECT
public:
    explicit BounceItem(QWidget* parent = nullptr);
    void setColor(const QColor& clr) { m_color = clr; update(); }
    QColor color() const { return m_color; }

protected:
    void paintEvent(QPaintEvent* event);

private:
    QColor m_color = Qt::blue;
};

BounceItem::BounceItem(QWidget *parent) : QWidget(parent)
{
    setFixedSize(ItemSize);
}

void BounceItem::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event)
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing);
    painter.setPen(Qt::NoPen);
    painter.setBrush(QBrush(m_color));
    painter.drawEllipse(rect());
}

class BounceIndicatorPrivate
{
public:
    void layoutItems();
    void makeBounce(int index);

    BounceIndicator* q_ptr;
    bool started = false;
    QList<BounceItem*> items;
    QPropertyAnimation* headAnimation = nullptr;
    QParallelAnimationGroup* parallelAnimGroup = nullptr;
};

void BounceIndicatorPrivate::layoutItems()
{
    int itemCount = items.size();
    static const int ItemSpace = 30;
    int horSpace = ItemSpace;
    for (int i = 0; i < items.size(); ++i) {
        items.at(i)->move(horSpace, (q_ptr->height() / 2)  - (ItemSize.height() / 2));
        horSpace += ItemSize.width() + ItemSpace;
    }
}

void BounceIndicatorPrivate::makeBounce(int index)
{
    if (index >= items.size())
        return;

    BounceItem* item = items.at(index);
    int x = item->x();
    int end = 20;
    int start = 50;

    QPropertyAnimation* anim = new QPropertyAnimation(item, "pos");
    anim->setEasingCurve(EasingCurve);
    anim->setDuration(BounceDuration);
    anim->setStartValue(QPoint(x, start));
    anim->setEndValue(QPoint(x, end));
    anim->start();

    if (index == 0 && !headAnimation)
        headAnimation = anim;

    q_ptr->connect(anim, &QAbstractAnimation::finished, [this, item, x, index, anim, start, end] () {
        QPropertyAnimation* reverseAnim = new QPropertyAnimation(item, "pos");
        reverseAnim->setEasingCurve(EasingCurve);
        reverseAnim->setDuration(BounceDuration);
        reverseAnim->setStartValue(QPoint(x, end));
        reverseAnim->setEndValue(QPoint(x, start));
        reverseAnim->start();

        makeBounce(index + 1);

        if (index == (items.size() - 1))
            q_ptr->connect(reverseAnim, SIGNAL(finished()), headAnimation, SLOT(start()));

        q_ptr->connect(reverseAnim, &QAbstractAnimation::finished, [anim] () {
//            anim->start();
        });
    });
}

BounceIndicator::BounceIndicator(QWidget *parent) : QWidget(parent)
{
    d_ptr = new BounceIndicatorPrivate;
    d_ptr->q_ptr = this;
    setNumberOfItems(7);
    setWindowFlags(Qt::FramelessWindowHint);
    setAttribute(Qt::WA_TranslucentBackground);
}

BounceIndicator::~BounceIndicator()
{
    delete d_ptr;
}

void BounceIndicator::setAnimationStarted(bool start)
{
    if (start) {

        if (d_ptr->items.isEmpty())
            return;

        int startIndex = 0;
        d_ptr->makeBounce(startIndex);

    } else {

    }
}

bool BounceIndicator::animationStarted() const
{
    return false;
}

void BounceIndicator::setNumberOfItems(int number)
{
    if (d_ptr->items.size() != number) {
        int delta = number - d_ptr->items.size();
        if (delta > 0) {
            for (int i = 0; i < delta; ++i) {
                BounceItem* item = new BounceItem(this);
                item->setColor(randomColor());
                d_ptr->items.append(item);
            }
        } else {
            for (int i = 0 ; i < qAbs(delta); ++i) {
                BounceItem* bi = d_ptr->items.takeLast();
                delete bi;
                d_ptr->items.pop_back();
            }
        }

        d_ptr->layoutItems();
    }
}

int BounceIndicator::numberOfItems() const
{
    return d_ptr->items.size();
}

QSize BounceIndicator::sizeHint() const
{
    return QSize(300, 80);
}

void BounceIndicator::resizeEvent(QResizeEvent* event)
{
    QWidget::resizeEvent(event);
    d_ptr->layoutItems();
}

#include "bounceindicator.moc"

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185

三、下载链接

https://download.csdn.net/download/u013083044/88846392