| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "fademessage.h" |
| |
| #include <QtWidgets> |
| |
| FadeMessage::FadeMessage(QWidget *parent): QGraphicsView(parent) |
| { |
| setScene(&m_scene); |
| setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
| setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
| |
| setupScene(); |
| |
| m_animation = new QPropertyAnimation(m_effect, "strength", this); |
| m_animation->setDuration(500); |
| m_animation->setEasingCurve(QEasingCurve::InOutSine); |
| m_animation->setStartValue(0); |
| m_animation->setEndValue(1); |
| |
| setRenderHint(QPainter::Antialiasing, true); |
| setFrameStyle(QFrame::NoFrame); |
| } |
| |
| void FadeMessage::togglePopup() |
| { |
| if (m_message->isVisible()) { |
| m_message->setVisible(false); |
| m_animation->setDirection(QAbstractAnimation::Backward); |
| } else { |
| m_message->setVisible(true); |
| m_animation->setDirection(QAbstractAnimation::Forward); |
| } |
| m_animation->start(); |
| } |
| |
| void FadeMessage::setupScene() |
| { |
| QGraphicsRectItem *parent = m_scene.addRect(0, 0, 800, 600); |
| parent->setPen(Qt::NoPen); |
| parent->setZValue(0); |
| |
| QGraphicsPixmapItem *bg = m_scene.addPixmap(QPixmap(":/background.jpg")); |
| bg->setParentItem(parent); |
| bg->setZValue(-1); |
| |
| for (int i = 1; i < 5; ++i) |
| for (int j = 2; j < 5; ++j) { |
| QGraphicsRectItem *item = m_scene.addRect(i * 50, (j - 1) * 50, 38, 38); |
| item->setParentItem(parent); |
| item->setZValue(1); |
| int hue = 12 * (i * 5 + j); |
| item->setBrush(QColor::fromHsv(hue, 128, 128)); |
| } |
| |
| QFont font; |
| font.setPointSize(font.pointSize() * 2); |
| font.setBold(true); |
| QFontMetrics fontMetrics(font); |
| int fh = fontMetrics.height(); |
| |
| QString sceneText = "Qt Everywhere!"; |
| int sceneTextWidth = fontMetrics.horizontalAdvance(sceneText); |
| |
| QGraphicsRectItem *block = m_scene.addRect(50, 300, sceneTextWidth, fh + 3); |
| block->setPen(Qt::NoPen); |
| block->setBrush(QColor(102, 153, 51)); |
| |
| QGraphicsTextItem *text = m_scene.addText(sceneText, font); |
| text->setDefaultTextColor(Qt::white); |
| text->setPos(50, 300); |
| block->setZValue(2); |
| block->hide(); |
| |
| text->setParentItem(block); |
| m_message = block; |
| |
| m_effect = new QGraphicsColorizeEffect; |
| m_effect->setColor(QColor(122, 193, 66)); |
| m_effect->setStrength(0); |
| m_effect->setEnabled(true); |
| parent->setGraphicsEffect(m_effect); |
| |
| QPushButton *press = new QPushButton; |
| press->setText(tr("Press me")); |
| connect(press, &QAbstractButton::clicked, this, &FadeMessage::togglePopup); |
| m_scene.addWidget(press); |
| |
| press->move(300, 500); |
| } |