document.cpp Example File | Qt 4.8 (original) (raw)

demos/undo/document.cpp

#include <qevent.h> #include #include #include #include "document.h" #include "commands.h"

static const int resizeHandleWidth = 6;

const QSize Shape::minSize(80, 50);

Shape::Shape(Type type, const QColor &color, const QRect &rect) : m_type(type), m_rect(rect), m_color(color) { }

Shape::Type Shape::type() const { return m_type; }

QRect Shape::rect() const { return m_rect; }

QColor Shape::color() const { return m_color; }

QString Shape::name() const { return m_name; }

QRect Shape::resizeHandle() const { QPoint br = m_rect.bottomRight(); return QRect(br - QPoint(resizeHandleWidth, resizeHandleWidth), br); }

QString Shape::typeToString(Type type) { QString result;

switch (type) {
    case Rectangle:
        result = QLatin1String("Rectangle");
        break;
    case Circle:
        result = QLatin1String("Circle");
        break;
    case Triangle:
        result = QLatin1String("Triangle");
        break;
}

return result;

}

Shape::Type Shape::stringToType(const QString &s, bool *ok) { if (ok != 0) *ok = true;

if (s == QLatin1String("Rectangle"))
    return Rectangle;
if (s == QLatin1String("Circle"))
    return Circle;
if (s == QLatin1String("Triangle"))
    return Triangle;

if (ok != 0)
    *ok = false;
return Rectangle;

}

Document::Document(QWidget *parent) : QWidget(parent), m_currentIndex(-1), m_mousePressIndex(-1), m_resizeHandlePressed(false) { m_undoStack = new QUndoStack(this);

setAutoFillBackground(true);
setBackgroundRole([QPalette](qpalette.html)::Base);

[QPalette](qpalette.html) pal = palette();
pal.setBrush([QPalette](qpalette.html)::Base, [QPixmap](qpixmap.html)(":/icons/background.png"));
pal.setColor([QPalette](qpalette.html)::HighlightedText, [Qt](qt-module.html)::red);
setPalette(pal);

}

QString Document::addShape(const Shape &shape) { QString name = Shape::typeToString(shape.type()); name = uniqueName(name);

m_shapeList.append(shape);
m_shapeList[m_shapeList.count() - 1].m_name = name;
setCurrentShape(m_shapeList.count() - 1);

return name;

}

void Document::deleteShape(const QString &shapeName) { int index = indexOf(shapeName); if (index == -1) return;

update(m_shapeList.at(index).rect());

m_shapeList.removeAt(index);

if (index <= m_currentIndex) {
    m_currentIndex = -1;
    if (index == m_shapeList.count())
        --index;
    setCurrentShape(index);
}

}

Shape Document::shape(const QString &shapeName) const { int index = indexOf(shapeName); if (index == -1) return Shape(); return m_shapeList.at(index); }

void Document::setShapeRect(const QString &shapeName, const QRect &rect) { int index = indexOf(shapeName); if (index == -1) return;

Shape &shape = m_shapeList[index];

update(shape.rect());
update(rect);

shape.m_rect = rect;

}

void Document::setShapeColor(const QString &shapeName, const QColor &color) {

int index = indexOf(shapeName);
if (index == -1)
    return;

Shape &shape = m_shapeList[index];
shape.m_color = color;

update(shape.rect());

}

QUndoStack *Document::undoStack() const { return m_undoStack; }

bool Document::load(QTextStream &stream) { m_shapeList.clear();

while (!stream.atEnd()) {
    [QString](qstring.html) shapeType, shapeName, colorName;
    int left, top, width, height;
    stream >> shapeType >> shapeName >> colorName >> left >> top >> width >> height;
    if (stream.status() != [QTextStream](qtextstream.html)::Ok)
        return false;
    bool ok;
    Shape::Type type = Shape::stringToType(shapeType, &ok);
    if (!ok)
        return false;
    [QColor](qcolor.html) color(colorName);
    if (!color.isValid())
        return false;

    Shape shape(type);
    shape.m_name = shapeName;
    shape.m_color = color;
    shape.m_rect = [QRect](qrect.html)(left, top, width, height);

    m_shapeList.append(shape);
}

m_currentIndex = m_shapeList.isEmpty() ? -1 : 0;

return true;

}

void Document::save(QTextStream &stream) { for (int i = 0; i < m_shapeList.count(); ++i) { const Shape &shape = m_shapeList.at(i); QRect r = shape.rect(); stream << Shape::typeToString(shape.type()) << QLatin1Char(' ') << shape.name() << QLatin1Char(' ') << shape.color().name() << QLatin1Char(' ') << r.left() << QLatin1Char(' ') << r.top() << QLatin1Char(' ') << r.width() << QLatin1Char(' ') << r.height(); if (i != m_shapeList.count() - 1) stream << QLatin1Char('\n'); } m_undoStack->setClean(); }

QString Document::fileName() const { return m_fileName; }

void Document::setFileName(const QString &fileName) { m_fileName = fileName; }

int Document::indexAt(const QPoint &pos) const { for (int i = m_shapeList.count() - 1; i >= 0; --i) { if (m_shapeList.at(i).rect().contains(pos)) return i; } return -1; }

void Document::mousePressEvent(QMouseEvent *event) { event->accept(); int index = indexAt(event->pos());; if (index != -1) { setCurrentShape(index);

    const Shape &shape = m_shapeList.at(index);
    m_resizeHandlePressed = shape.resizeHandle().contains(event->pos());

    if (m_resizeHandlePressed)
        m_mousePressOffset = shape.rect().bottomRight() - event->pos();
    else
        m_mousePressOffset = event->pos() - shape.rect().topLeft();
}
m_mousePressIndex = index;

}

void Document::mouseReleaseEvent(QMouseEvent *event) { event->accept(); m_mousePressIndex = -1; }

void Document::mouseMoveEvent(QMouseEvent *event) { event->accept();

if (m_mousePressIndex == -1)
    return;

const Shape &shape = m_shapeList.at(m_mousePressIndex);

[QRect](qrect.html) rect;
if (m_resizeHandlePressed) {
    rect = [QRect](qrect.html)(shape.rect().topLeft(), event->pos() + m_mousePressOffset);
} else {
    rect = shape.rect();
    rect.moveTopLeft(event->pos() - m_mousePressOffset);
}

[QSize](qsize.html) size = rect.size().expandedTo(Shape::minSize);
rect.setSize(size);

m_undoStack->push(new SetShapeRectCommand(this, shape.name(), rect));

}

static QGradient gradient(const QColor &color, const QRect &rect) { QColor c = color; c.setAlpha(160); QLinearGradient result(rect.topLeft(), rect.bottomRight()); result.setColorAt(0, c.dark(150)); result.setColorAt(0.5, c.light(200)); result.setColorAt(1, c.dark(150)); return result; }

static QPolygon triangle(const QRect &rect) { QPolygon result(3); result.setPoint(0, rect.center().x(), rect.top()); result.setPoint(1, rect.right(), rect.bottom()); result.setPoint(2, rect.left(), rect.bottom()); return result; }

void Document::paintEvent(QPaintEvent *event) { QRegion paintRegion = event->region(); QPainter painter(this); QPalette pal = palette();

for (int i = 0; i < m_shapeList.count(); ++i) {
    const Shape &shape = m_shapeList.at(i);

    if (!paintRegion.contains(shape.rect()))
        continue;

    [QPen](qpen.html) pen = pal.text().color();
    pen.setWidth(i == m_currentIndex ? 2 : 1);
    painter.setPen(pen);
    painter.setBrush(gradient(shape.color(), shape.rect()));

    [QRect](qrect.html) rect = shape.rect();
    rect.adjust(1, 1, -resizeHandleWidth/2, -resizeHandleWidth/2);

    
    switch (shape.type()) {
        case Shape::Rectangle:
            painter.drawRect(rect);
            break;
        case Shape::Circle:
            painter.setRenderHint([QPainter](qpainter.html)::Antialiasing);
            painter.drawEllipse(rect);
            painter.setRenderHint([QPainter](qpainter.html)::Antialiasing, false);
            break;
        case Shape::Triangle:
            painter.setRenderHint([QPainter](qpainter.html)::Antialiasing);
            painter.drawPolygon(triangle(rect));
            painter.setRenderHint([QPainter](qpainter.html)::Antialiasing, false);
            break;
    }

    
    painter.setPen(pal.text().color());
    painter.setBrush([Qt](qt-module.html)::white);
    painter.drawRect(shape.resizeHandle().adjusted(0, 0, -1, -1));

    
    painter.setBrush(pal.text());
    if (shape.type() == Shape::Triangle)
        rect.adjust(0, rect.height()/2, 0, 0);
    painter.drawText(rect, [Qt](qt-module.html)::AlignCenter, shape.name());
}

}

void Document::setCurrentShape(int index) { QString currentName;

if (m_currentIndex != -1)
    update(m_shapeList.at(m_currentIndex).rect());

m_currentIndex = index;

if (m_currentIndex != -1) {
    const Shape &current = m_shapeList.at(m_currentIndex);
    update(current.rect());
    currentName = current.name();
}

emit currentShapeChanged(currentName);

}

int Document::indexOf(const QString &shapeName) const { for (int i = 0; i < m_shapeList.count(); ++i) { if (m_shapeList.at(i).name() == shapeName) return i; } return -1; }

QString Document::uniqueName(const QString &name) const { QString unique;

for (int i = 0; ; ++i) {
    unique = name;
    if (i > 0)
        unique += [QString](qstring.html)::number(i);
    if (indexOf(unique) == -1)
        break;
}

return unique;

}

QString Document::currentShapeName() const { if (m_currentIndex == -1) return QString(); return m_shapeList.at(m_currentIndex).name(); }

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