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Diffstat (limited to 'src/declarative/graphicsitems/qdeclarativerectangle.cpp')
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diff --git a/src/declarative/graphicsitems/qdeclarativerectangle.cpp b/src/declarative/graphicsitems/qdeclarativerectangle.cpp new file mode 100644 index 0000000..d534f21 --- /dev/null +++ b/src/declarative/graphicsitems/qdeclarativerectangle.cpp @@ -0,0 +1,466 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qdeclarativerectangle_p.h" +#include "qdeclarativerectangle_p_p.h" + +#include <QPainter> +#include <QtCore/qmath.h> + +QT_BEGIN_NAMESPACE + +/*! + \internal + \class QDeclarativePen + \brief The QDeclarativePen class provides a pen used for drawing rectangle borders on a QDeclarativeView. + + By default, the pen is invalid and nothing is drawn. You must either set a color (then the default + width is 1) or a width (then the default color is black). + + A width of 1 indicates is a single-pixel line on the border of the item being painted. + + Example: + \qml + Rectangle { border.width: 2; border.color: "red" ... } + \endqml +*/ + +void QDeclarativePen::setColor(const QColor &c) +{ + _color = c; + _valid = _color.alpha() ? true : false; + emit penChanged(); +} + +void QDeclarativePen::setWidth(int w) +{ + if (_width == w && _valid) + return; + + _width = w; + _valid = (_width < 1) ? false : true; + emit penChanged(); +} + + +/*! + \qmlclass GradientStop QDeclarativeGradientStop + \since 4.7 + \brief The GradientStop item defines the color at a position in a Gradient + + \sa Gradient +*/ + +/*! + \qmlproperty real GradientStop::position + \qmlproperty color GradientStop::color + + Sets a \e color at a \e position in a gradient. +*/ + +void QDeclarativeGradientStop::updateGradient() +{ + if (QDeclarativeGradient *grad = qobject_cast<QDeclarativeGradient*>(parent())) + grad->doUpdate(); +} + +/*! + \qmlclass Gradient QDeclarativeGradient + \since 4.7 + \brief The Gradient item defines a gradient fill. + + A gradient is defined by two or more colors, which will be blended seemlessly. The + colors are specified at their position in the range 0.0 - 1.0 via + the GradientStop item. For example, the following code paints a + rectangle with a gradient starting with red, blending to yellow at 1/3 of the + size of the rectangle, and ending with Green: + + \table + \row + \o \image gradient.png + \o \quotefile doc/src/snippets/declarative/gradient.qml + \endtable + + \sa GradientStop +*/ + +/*! + \qmlproperty list<GradientStop> Gradient::stops + This property holds the gradient stops describing the gradient. +*/ + +const QGradient *QDeclarativeGradient::gradient() const +{ + if (!m_gradient && !m_stops.isEmpty()) { + m_gradient = new QLinearGradient(0,0,0,1.0); + for (int i = 0; i < m_stops.count(); ++i) { + const QDeclarativeGradientStop *stop = m_stops.at(i); + m_gradient->setCoordinateMode(QGradient::ObjectBoundingMode); + m_gradient->setColorAt(stop->position(), stop->color()); + } + } + + return m_gradient; +} + +void QDeclarativeGradient::doUpdate() +{ + delete m_gradient; + m_gradient = 0; + emit updated(); +} + + +/*! + \qmlclass Rectangle QDeclarativeRectangle + \since 4.7 + \brief The Rectangle item allows you to add rectangles to a scene. + \inherits Item + + A Rectangle is painted having a solid fill (color) and an optional border. + You can also create rounded rectangles using the radius property. + + \qml + Rectangle { + width: 100 + height: 100 + color: "red" + border.color: "black" + border.width: 5 + radius: 10 + } + \endqml + + \image declarative-rect.png +*/ + +/*! + \internal + \class QDeclarativeRectangle + \brief The QDeclarativeRectangle class provides a rectangle item that you can add to a QDeclarativeView. +*/ +QDeclarativeRectangle::QDeclarativeRectangle(QDeclarativeItem *parent) + : QDeclarativeItem(*(new QDeclarativeRectanglePrivate), parent) +{ + Q_D(QDeclarativeRectangle); + d->init(); + setFlag(QGraphicsItem::ItemHasNoContents, false); +} + +void QDeclarativeRectangle::doUpdate() +{ + Q_D(QDeclarativeRectangle); + d->rectImage = QPixmap(); + const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0; + d->setPaintMargin((pw+1)/2); + update(); +} + +/*! + \qmlproperty int Rectangle::border.width + \qmlproperty color Rectangle::border.color + + The width and color used to draw the border of the rectangle. + + A width of 1 creates a thin line. For no line, use a width of 0 or a transparent color. + + To keep the border smooth (rather than blurry), odd widths cause the rectangle to be painted at + a half-pixel offset; +*/ +QDeclarativePen *QDeclarativeRectangle::border() +{ + Q_D(QDeclarativeRectangle); + return d->getPen(); +} + +/*! + \qmlproperty Gradient Rectangle::gradient + + The gradient to use to fill the rectangle. + + This property allows for the construction of simple vertical gradients. + Other gradients may by formed by adding rotation to the rectangle. + + \table + \row + \o \image declarative-rect_gradient.png + \o + \qml + Rectangle { y: 0; width: 80; height: 80; color: "lightsteelblue" } + Rectangle { y: 100; width: 80; height: 80 + gradient: Gradient { + GradientStop { position: 0.0; color: "lightsteelblue" } + GradientStop { position: 1.0; color: "blue" } + } + } + Rectangle { rotation: 90; x: 80; y: 200; width: 80; height: 80 + gradient: Gradient { + GradientStop { position: 0.0; color: "lightsteelblue" } + GradientStop { position: 1.0; color: "blue" } + } + } + // The x offset is needed because the rotation is from the top left corner + \endqml + \endtable + + If both a gradient and a color are specified, the gradient will be used. + + \sa Gradient, color +*/ +QDeclarativeGradient *QDeclarativeRectangle::gradient() const +{ + Q_D(const QDeclarativeRectangle); + return d->gradient; +} + +void QDeclarativeRectangle::setGradient(QDeclarativeGradient *gradient) +{ + Q_D(QDeclarativeRectangle); + if (d->gradient == gradient) + return; + if (d->gradient) + disconnect(d->gradient, SIGNAL(updated()), this, SLOT(doUpdate())); + d->gradient = gradient; + if (d->gradient) + connect(d->gradient, SIGNAL(updated()), this, SLOT(doUpdate())); + update(); +} + + +/*! + \qmlproperty real Rectangle::radius + This property holds the corner radius used to draw a rounded rectangle. + + If radius is non-zero, the rectangle will be painted as a rounded rectangle, otherwise it will be + painted as a normal rectangle. The same radius is used by all 4 corners; there is currently + no way to specify different radii for different corners. +*/ +qreal QDeclarativeRectangle::radius() const +{ + Q_D(const QDeclarativeRectangle); + return d->radius; +} + +void QDeclarativeRectangle::setRadius(qreal radius) +{ + Q_D(QDeclarativeRectangle); + if (d->radius == radius) + return; + + d->radius = radius; + d->rectImage = QPixmap(); + update(); + emit radiusChanged(); +} + +/*! + \qmlproperty color Rectangle::color + This property holds the color used to fill the rectangle. + + \qml + // green rectangle using hexidecimal notation + Rectangle { color: "#00FF00" } + + // steelblue rectangle using SVG color name + Rectangle { color: "steelblue" } + \endqml + + The default color is white. + + If both a gradient and a color are specified, the gradient will be used. +*/ +QColor QDeclarativeRectangle::color() const +{ + Q_D(const QDeclarativeRectangle); + return d->color; +} + +void QDeclarativeRectangle::setColor(const QColor &c) +{ + Q_D(QDeclarativeRectangle); + if (d->color == c) + return; + + d->color = c; + d->rectImage = QPixmap(); + update(); + emit colorChanged(); +} + +void QDeclarativeRectangle::generateRoundedRect() +{ + Q_D(QDeclarativeRectangle); + if (d->rectImage.isNull()) { + const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0; + const int radius = qCeil(d->radius); //ensure odd numbered width/height so we get 1-pixel center + d->rectImage = QPixmap(radius*2 + 3 + pw*2, radius*2 + 3 + pw*2); + d->rectImage.fill(Qt::transparent); + QPainter p(&(d->rectImage)); + p.setRenderHint(QPainter::Antialiasing); + if (d->pen && d->pen->isValid()) { + QPen pn(QColor(d->pen->color()), d->pen->width()); + p.setPen(pn); + } else { + p.setPen(Qt::NoPen); + } + p.setBrush(d->color); + if (pw%2) + p.drawRoundedRect(QRectF(qreal(pw)/2+1, qreal(pw)/2+1, d->rectImage.width()-(pw+1), d->rectImage.height()-(pw+1)), d->radius, d->radius); + else + p.drawRoundedRect(QRectF(qreal(pw)/2, qreal(pw)/2, d->rectImage.width()-pw, d->rectImage.height()-pw), d->radius, d->radius); + } +} + +void QDeclarativeRectangle::generateBorderedRect() +{ + Q_D(QDeclarativeRectangle); + if (d->rectImage.isNull()) { + const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0; + d->rectImage = QPixmap(pw*2 + 3, pw*2 + 3); + d->rectImage.fill(Qt::transparent); + QPainter p(&(d->rectImage)); + p.setRenderHint(QPainter::Antialiasing); + if (d->pen && d->pen->isValid()) { + QPen pn(QColor(d->pen->color()), d->pen->width()); + pn.setJoinStyle(Qt::MiterJoin); + p.setPen(pn); + } else { + p.setPen(Qt::NoPen); + } + p.setBrush(d->color); + if (pw%2) + p.drawRect(QRectF(qreal(pw)/2+1, qreal(pw)/2+1, d->rectImage.width()-(pw+1), d->rectImage.height()-(pw+1))); + else + p.drawRect(QRectF(qreal(pw)/2, qreal(pw)/2, d->rectImage.width()-pw, d->rectImage.height()-pw)); + } +} + +void QDeclarativeRectangle::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *) +{ + Q_D(QDeclarativeRectangle); + if (d->radius > 0 || (d->pen && d->pen->isValid()) + || (d->gradient && d->gradient->gradient()) ) { + drawRect(*p); + } + else { + bool oldAA = p->testRenderHint(QPainter::Antialiasing); + if (d->smooth) + p->setRenderHints(QPainter::Antialiasing, true); + p->fillRect(QRectF(0, 0, width(), height()), d->color); + if (d->smooth) + p->setRenderHint(QPainter::Antialiasing, oldAA); + } +} + +void QDeclarativeRectangle::drawRect(QPainter &p) +{ + Q_D(QDeclarativeRectangle); + if (d->gradient && d->gradient->gradient()) { + // XXX This path is still slower than the image path + // Image path won't work for gradients though + bool oldAA = p.testRenderHint(QPainter::Antialiasing); + if (d->smooth) + p.setRenderHint(QPainter::Antialiasing); + if (d->pen && d->pen->isValid()) { + QPen pn(QColor(d->pen->color()), d->pen->width()); + p.setPen(pn); + } else { + p.setPen(Qt::NoPen); + } + p.setBrush(*d->gradient->gradient()); + if (d->radius > 0.) + p.drawRoundedRect(0, 0, width(), height(), d->radius, d->radius); + else + p.drawRect(0, 0, width(), height()); + if (d->smooth) + p.setRenderHint(QPainter::Antialiasing, oldAA); + } else { + bool oldAA = p.testRenderHint(QPainter::Antialiasing); + bool oldSmooth = p.testRenderHint(QPainter::SmoothPixmapTransform); + if (d->smooth) + p.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform, d->smooth); + + const int pw = d->pen && d->pen->isValid() ? (d->pen->width()+1)/2*2 : 0; + + if (d->radius > 0) + generateRoundedRect(); + else + generateBorderedRect(); + + int xOffset = (d->rectImage.width()-1)/2; + int yOffset = (d->rectImage.height()-1)/2; + Q_ASSERT(d->rectImage.width() == 2*xOffset + 1); + Q_ASSERT(d->rectImage.height() == 2*yOffset + 1); + + QMargins margins(xOffset, yOffset, xOffset, yOffset); + QTileRules rules(Qt::StretchTile, Qt::StretchTile); + //NOTE: even though our item may have qreal-based width and height, qDrawBorderPixmap only supports QRects + qDrawBorderPixmap(&p, QRect(-pw/2, -pw/2, width()+pw, height()+pw), margins, d->rectImage, d->rectImage.rect(), margins, rules); + + if (d->smooth) { + p.setRenderHint(QPainter::Antialiasing, oldAA); + p.setRenderHint(QPainter::SmoothPixmapTransform, oldSmooth); + } + } +} + +/*! + \qmlproperty bool Rectangle::smooth + + Set this property if you want the item to be smoothly scaled or + transformed. Smooth filtering gives better visual quality, but is slower. If + the item is displayed at its natural size, this property has no visual or + performance effect. + + \note Generally scaling artifacts are only visible if the item is stationary on + the screen. A common pattern when animating an item is to disable smooth + filtering at the beginning of the animation and reenable it at the conclusion. + + \image rect-smooth.png +*/ + +QRectF QDeclarativeRectangle::boundingRect() const +{ + Q_D(const QDeclarativeRectangle); + return QRectF(-d->paintmargin, -d->paintmargin, d->width+d->paintmargin*2, d->height+d->paintmargin*2); +} + +QT_END_NAMESPACE |