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IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "sortingbox.h" #include #include #include #include #include #include #include //! [0] SortingBox::SortingBox(QWidget *parent) : QWidget(parent) { //! [0] //! [1] setMouseTracking(true); //! [1] //! [2] setBackgroundRole(QPalette::Base); //! [2] itemInMotion = nullptr; //! [3] newCircleButton = createToolButton(tr("New Circle"), QIcon(":/images/circle.png"), SLOT(createNewCircle())); newSquareButton = createToolButton(tr("New Square"), QIcon(":/images/square.png"), SLOT(createNewSquare())); newTriangleButton = createToolButton(tr("New Triangle"), QIcon(":/images/triangle.png"), SLOT(createNewTriangle())); circlePath.addEllipse(QRect(0, 0, 100, 100)); squarePath.addRect(QRect(0, 0, 100, 100)); qreal x = trianglePath.currentPosition().x(); qreal y = trianglePath.currentPosition().y(); trianglePath.moveTo(x + 120 / 2, y); trianglePath.lineTo(0, 100); trianglePath.lineTo(120, 100); trianglePath.lineTo(x + 120 / 2, y); //! [3] //! [4] setWindowTitle(tr("Tool Tips")); resize(500, 300); createShapeItem(circlePath, tr("Circle"), initialItemPosition(circlePath), initialItemColor()); createShapeItem(squarePath, tr("Square"), initialItemPosition(squarePath), initialItemColor()); createShapeItem(trianglePath, tr("Triangle"), initialItemPosition(trianglePath), initialItemColor()); } //! [4] //! [5] bool SortingBox::event(QEvent *event) { //! [5] //! [6] if (event->type() == QEvent::ToolTip) { QHelpEvent *helpEvent = static_cast(event); int index = itemAt(helpEvent->pos()); if (index != -1) { QToolTip::showText(helpEvent->globalPos(), shapeItems[index].toolTip()); } else { QToolTip::hideText(); event->ignore(); } return true; } return QWidget::event(event); } //! [6] //! [7] void SortingBox::resizeEvent(QResizeEvent * /* event */) { int margin = style()->pixelMetric(QStyle::PM_DefaultTopLevelMargin); int x = width() - margin; int y = height() - margin; y = updateButtonGeometry(newCircleButton, x, y); y = updateButtonGeometry(newSquareButton, x, y); updateButtonGeometry(newTriangleButton, x, y); } //! [7] //! [8] void SortingBox::paintEvent(QPaintEvent * /* event */) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); for (const ShapeItem &shapeItem : qAsConst(shapeItems)) { //! [8] //! [9] painter.translate(shapeItem.position()); //! [9] //! [10] painter.setBrush(shapeItem.color()); painter.drawPath(shapeItem.path()); painter.translate(-shapeItem.position()); } } //! [10] //! [11] void SortingBox::mousePressEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton) { int index = itemAt(event->pos()); if (index != -1) { itemInMotion = &shapeItems[index]; previousPosition = event->pos(); shapeItems.move(index, shapeItems.size() - 1); update(); } } } //! [11] //! [12] void SortingBox::mouseMoveEvent(QMouseEvent *event) { if ((event->buttons() & Qt::LeftButton) && itemInMotion) moveItemTo(event->pos()); } //! [12] //! [13] void SortingBox::mouseReleaseEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton && itemInMotion) { moveItemTo(event->pos()); itemInMotion = nullptr; } } //! [13] //! [14] void SortingBox::createNewCircle() { static int count = 1; createShapeItem(circlePath, tr("Circle <%1>").arg(++count), randomItemPosition(), randomItemColor()); } //! [14] //! [15] void SortingBox::createNewSquare() { static int count = 1; createShapeItem(squarePath, tr("Square <%1>").arg(++count), randomItemPosition(), randomItemColor()); } //! [15] //! [16] void SortingBox::createNewTriangle() { static int count = 1; createShapeItem(trianglePath, tr("Triangle <%1>").arg(++count), randomItemPosition(), randomItemColor()); } //! [16] //! [17] int SortingBox::itemAt(const QPoint &pos) { for (int i = shapeItems.size() - 1; i >= 0; --i) { const ShapeItem &item = shapeItems[i]; if (item.path().contains(pos - item.position())) return i; } return -1; } //! [17] //! [18] void SortingBox::moveItemTo(const QPoint &pos) { QPoint offset = pos - previousPosition; itemInMotion->setPosition(itemInMotion->position() + offset); //! [18] //! [19] previousPosition = pos; update(); } //! [19] //! [20] int SortingBox::updateButtonGeometry(QToolButton *button, int x, int y) { QSize size = button->sizeHint(); button->setGeometry(x - size.rwidth(), y - size.rheight(), size.rwidth(), size.rheight()); return y - size.rheight() - style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing); } //! [20] //! [21] void SortingBox::createShapeItem(const QPainterPath &path, const QString &toolTip, const QPoint &pos, const QColor &color) { ShapeItem shapeItem; shapeItem.setPath(path); shapeItem.setToolTip(toolTip); shapeItem.setPosition(pos); shapeItem.setColor(color); shapeItems.append(shapeItem); update(); } //! [21] //! [22] QToolButton *SortingBox::createToolButton(const QString &toolTip, const QIcon &icon, const char *member) { QToolButton *button = new QToolButton(this); button->setToolTip(toolTip); button->setIcon(icon); button->setIconSize(QSize(32, 32)); connect(button, SIGNAL(clicked()), this, member); return button; } //! [22] //! [23] QPoint SortingBox::initialItemPosition(const QPainterPath &path) { int x; int y = (height() - qRound(path.controlPointRect().height()) / 2); if (shapeItems.size() == 0) x = ((3 * width()) / 2 - qRound(path.controlPointRect().width())) / 2; else x = (width() / shapeItems.size() - qRound(path.controlPointRect().width())) / 2; return QPoint(x, y); } //! [23] //! [24] QPoint SortingBox::randomItemPosition() { return QPoint(QRandomGenerator::global()->bounded(width() - 120), QRandomGenerator::global()->bounded(height() - 120)); } //! [24] //! [25] QColor SortingBox::initialItemColor() { return QColor::fromHsv(((shapeItems.size() + 1) * 85) % 256, 255, 190); } //! [25] //! [26] QColor SortingBox::randomItemColor() { return QColor::fromHsv(QRandomGenerator::global()->bounded(256), 255, 190); } //! [26]