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     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     6 ** This file is part of the examples of the Qt Toolkit.

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    15 ** GNU Lesser General Public License Usage

    16 ** Alternatively, this file may be used under the terms of the GNU Lesser

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    28 ** GNU General Public License Usage

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    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 #include "button.h"

    44 #include "theme.h"

    45 

    46 static const int MinTextWidthAsChars = 8;

    47 

    48 class ButtonPrivate {

    49     Q_DECLARE_PUBLIC(Button)

    50 

    51 public:

    52 

    53     ButtonPrivate(Button *button) 

    54        : down(false)

    55        , q_ptr(button)

    56     {

    57         textItem = new QGraphicsSimpleTextItem(q_ptr);

    58     }

    59 

    60     QGraphicsSimpleTextItem *textItem;

    61     bool down;

    62     Button *q_ptr;

    63 };

    64 

    65 Button::Button(const QString &text, QGraphicsItem *parent, QSizeF minimumSize)

    66     : QGraphicsWidget(parent)

    67     , d_ptr(new ButtonPrivate(this)), m_background(), m_selected(false)

    68 { 

    69     Q_D(Button);

    70     setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);

    71     //setCacheMode(QGraphicsItem::ItemCoordinateCache);

    72     if(minimumSize.isValid())

    73         setMinimumSize(minimumSize);

    74     setContentsMargins(0, 0, 0, 0);

    75     d->textItem->setText(text);

    76     prepareGeometryChange();

    77 

    78     m_font = Theme::p()->font(Theme::MenuItem);

    79     d->textItem->setFont(m_font);

    80     connect(Theme::p(), SIGNAL(themeChanged()), this, SLOT(themeChange()));

    81 }

    82 

    83 Button::~Button()

    84 {

    85     delete d_ptr;

    86 }

    87 

    88 bool Button::isDown()

    89 {

    90     Q_D(Button);

    91 

    92     return d->down;

    93 }

    94 

    95 void Button::setText(const QString &text)

    96 {

    97     Q_D(Button);

    98     d->textItem->setText(text);

    99     update();

   100 }

   101 

   102 QString Button::text()

   103 {

   104     Q_D(Button);

   105     return d->textItem->text();

   106 }

   107 

   108 void Button::paint(QPainter *painter, 

   109         const QStyleOptionGraphicsItem *option, 

   110         QWidget *widget)

   111 {

   112     Q_UNUSED(widget);

   113     Q_UNUSED(option);

   114     

   115     if(!m_background.isNull())

   116         painter->drawPixmap(QPoint(), m_background);

   117     if(m_selected) {

   118         painter->setBrush(Qt::black);

   119         painter->setOpacity(0.2);

   120         painter->drawRect(boundingRect().toRect());

   121     }

   122 }

   123 

   124 QSizeF Button::sizeHint(Qt::SizeHint which, 

   125         const QSizeF &constraint) const 

   126 {

   127     Q_D(const Button);

   128 

   129     switch (which)

   130     {

   131     case Qt::MinimumSize:

   132          {

   133          QFontMetricsF fm(d->textItem->font());

   134          return QSizeF(MinTextWidthAsChars * fm.maxWidth(), fm.height());

   135          }

   136      case Qt::PreferredSize:

   137          {

   138          QFontMetricsF fm(d->textItem->font());

   139          return QSizeF(fm.width(d->textItem->text()), fm.height());

   140          }

   141     default:

   142         return QGraphicsWidget::sizeHint(which, constraint);

   143     }

   144 }

   145 

   146 void Button::mousePressEvent(QGraphicsSceneMouseEvent *event)

   147 {

   148     Q_D(Button);

   149     

   150     if (event->button() != Qt::LeftButton ||

   151                   !sceneBoundingRect().contains(event->scenePos()))

   152         return;

   153 

   154     d->down = true;

   155 

   156     prepareGeometryChange();

   157     emit pressed();

   158 

   159 }

   160 

   161 void Button::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)

   162 {

   163     Q_D(Button);

   164 

   165     if (!d->down || event->button() != Qt::LeftButton) 

   166         return;

   167 

   168     d->down = false;

   169 

   170     prepareGeometryChange();

   171 

   172     emit released();

   173 

   174     if (sceneBoundingRect().contains(event->scenePos()))

   175         emit clicked();

   176 }

   177 

   178 void Button::mouseMoveEvent(QGraphicsSceneMouseEvent *event)

   179 {

   180     Q_UNUSED(event);

   181 }

   182 

   183 void Button::resizeEvent(QGraphicsSceneResizeEvent *event)

   184 {

   185     Q_D(Button);

   186     QGraphicsWidget::resizeEvent(event);

   187     

   188     QRectF rect = d->textItem->boundingRect();

   189     QRectF buttonrect = this->boundingRect();

   190     d->textItem->setPos((buttonrect.width() - rect.width())/2, (buttonrect.height() - rect.height())/2 );

   191     

   192     QSize currentSize = buttonrect.size().toSize();

   193     if( m_background.size() != currentSize && (currentSize.width() > 0 && currentSize.height() > 0)  ) {

   194         m_background = Theme::p()->pixmap("status_field_middle.svg", buttonrect.size().toSize());

   195     }

   196 }

   197 

   198 void Button::setBackground(QPixmap& background)

   199 {

   200     m_background = background;

   201 }

   202 

   203 void Button::themeChange()

   204 {

   205     Q_D(Button);

   206 

   207     m_font = Theme::p()->font(Theme::MenuItem);

   208     d->textItem->setFont(m_font);

   209 }