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50
51#include "fademessage.h"
52
53#include <QtWidgets>
54
55FadeMessage::FadeMessage(QWidget *parent): QGraphicsView(parent)
56{
57 setScene(&m_scene);
58 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
59 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
60
61 setupScene();
62
63 m_animation = new QPropertyAnimation(m_effect, "strength", this);
64 m_animation->setDuration(500);
65 m_animation->setEasingCurve(QEasingCurve::InOutSine);
66 m_animation->setStartValue(0);
67 m_animation->setEndValue(1);
68
69 setRenderHint(hint: QPainter::Antialiasing, enabled: true);
70 setFrameStyle(QFrame::NoFrame);
71}
72
73void FadeMessage::togglePopup()
74{
75 if (m_message->isVisible()) {
76 m_message->setVisible(false);
77 m_animation->setDirection(QAbstractAnimation::Backward);
78 } else {
79 m_message->setVisible(true);
80 m_animation->setDirection(QAbstractAnimation::Forward);
81 }
82 m_animation->start();
83}
84
85void FadeMessage::setupScene()
86{
87 QGraphicsRectItem *parent = m_scene.addRect(x: 0, y: 0, w: 800, h: 600);
88 parent->setPen(Qt::NoPen);
89 parent->setZValue(0);
90
91 QGraphicsPixmapItem *bg = m_scene.addPixmap(pixmap: QPixmap(":/background.jpg"));
92 bg->setParentItem(parent);
93 bg->setZValue(-1);
94
95 for (int i = 1; i < 5; ++i)
96 for (int j = 2; j < 5; ++j) {
97 QGraphicsRectItem *item = m_scene.addRect(x: i * 50, y: (j - 1) * 50, w: 38, h: 38);
98 item->setParentItem(parent);
99 item->setZValue(1);
100 int hue = 12 * (i * 5 + j);
101 item->setBrush(QColor::fromHsv(h: hue, s: 128, v: 128));
102 }
103
104 QFont font;
105 font.setPointSize(font.pointSize() * 2);
106 font.setBold(true);
107 QFontMetrics fontMetrics(font);
108 int fh = fontMetrics.height();
109
110 QString sceneText = "Qt Everywhere!";
111 int sceneTextWidth = fontMetrics.horizontalAdvance(sceneText);
112
113 QGraphicsRectItem *block = m_scene.addRect(x: 50, y: 300, w: sceneTextWidth, h: fh + 3);
114 block->setPen(Qt::NoPen);
115 block->setBrush(QColor(102, 153, 51));
116
117 QGraphicsTextItem *text = m_scene.addText(text: sceneText, font);
118 text->setDefaultTextColor(Qt::white);
119 text->setPos(ax: 50, ay: 300);
120 block->setZValue(2);
121 block->hide();
122
123 text->setParentItem(block);
124 m_message = block;
125
126 m_effect = new QGraphicsColorizeEffect;
127 m_effect->setColor(QColor(122, 193, 66));
128 m_effect->setStrength(0);
129 m_effect->setEnabled(true);
130 parent->setGraphicsEffect(m_effect);
131
132 QPushButton *press = new QPushButton;
133 press->setText(tr(s: "Press me"));
134 connect(sender: press, signal: &QAbstractButton::clicked, receiver: this, slot: &FadeMessage::togglePopup);
135 m_scene.addWidget(widget: press);
136
137 press->move(ax: 300, ay: 500);
138}
139

source code of qtbase/examples/widgets/effects/fademessage/fademessage.cpp