Shared: Added Button widget

This is a simple button implementation that provides
the basic capabilities.

Signed-off-by: Adriano Rezende <adriano.rezende@openbossa.org>

1 files changed, 184 insertions, 0 deletions

diff --git a/shared/button.cpp b/shared/button.cpp
new file mode 100644
index 0000000..e6e8d24
--- /dev/null
+++ b/shared/button.cpp
@@ -0,0 +1,184 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: openBossa - INdT (renato.chencarek@openbossa.org)
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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
+** the openBossa stream from INdT (renato.chencarek@openbossa.org).
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QPixmap>
+#include <QPainter>
+#include <QStyleOptionGraphicsItem>
+#include <QGraphicsSceneMouseEvent>
+
+#include "button.h"
+
+
+class ButtonPrivate
+{
+public:
+    ButtonPrivate(Button *qptr);
+
+    void init();
+
+    Button *q;
+    QString text;
+    bool isPressed;
+    QPixmap normalPixmap;
+    QPixmap pressedPixmap;
+    QPixmap disabledPixmap;
+};
+
+ButtonPrivate::ButtonPrivate(Button *qptr)
+    : q(qptr), isPressed(false)
+{
+
+}
+
+void ButtonPrivate::init()
+{
+    q->setMinimumSize(normalPixmap.size());
+    q->setMaximumSize(normalPixmap.size());
+}
+
+
+Button::Button(const QPixmap &normal, QGraphicsItem *parent)
+    : QGraphicsWidget(parent),
+      d(new ButtonPrivate(this))
+{
+    d->normalPixmap = normal;
+    d->init();
+}
+
+Button::Button(const QPixmap &normal, const QPixmap &pressed,
+               QGraphicsItem *parent)
+    : QGraphicsWidget(parent),
+      d(new ButtonPrivate(this))
+{
+    d->normalPixmap = normal;
+    d->pressedPixmap = pressed;
+    d->init();
+}
+
+Button::Button(const QPixmap &normal, const QPixmap &pressed,
+               const QPixmap &disabled, QGraphicsItem *parent)
+    : QGraphicsWidget(parent),
+      d(new ButtonPrivate(this))
+{
+    d->normalPixmap = normal;
+    d->pressedPixmap = pressed;
+    d->disabledPixmap = disabled;
+    d->init();
+}
+
+Button::~Button()
+{
+    delete d;
+}
+
+void Button::setPixmap(State state, const QPixmap &pixmap)
+{
+    bool dirty = false;
+
+    if (state == NormalState) {
+        d->normalPixmap = pixmap;
+        dirty = (!d->isPressed && isEnabled());
+        setMinimumSize(d->normalPixmap.size());
+        setMaximumSize(d->normalPixmap.size());
+    } else if (state == PressedState) {
+        dirty = d->isPressed;
+        d->pressedPixmap = pixmap;
+    } else if (state == DisabledState) {
+        dirty = !isEnabled();
+        d->disabledPixmap = pixmap;
+    }
+
+    if (dirty)
+        update();
+}
+
+QString Button::text() const
+{
+    return d->text;
+}
+
+void Button::setText(const QString &value)
+{
+    if (d->text != value) {
+        d->text = value;
+        update();
+    }
+}
+
+void Button::mousePressEvent(QGraphicsSceneMouseEvent *e)
+{
+    if (e->button() == Qt::LeftButton) {
+        d->isPressed = true;
+        update();
+        emit pressed();
+    }
+}
+
+void Button::mouseReleaseEvent(QGraphicsSceneMouseEvent *e)
+{
+    if (e->button() == Qt::LeftButton) {
+        const bool isClick = d->isPressed;
+
+        d->isPressed = false;
+        update();
+        emit released();
+
+        if (isClick && contains(e->pos()))
+            emit clicked();
+    }
+}
+
+void Button::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+                   QWidget *widget)
+{
+    Q_UNUSED(widget);
+
+    if (!(option->state & QStyle::State_Enabled)) {
+        const bool support = !d->disabledPixmap.isNull();
+        painter->drawPixmap(0, 0, support ? d->disabledPixmap : d->normalPixmap);
+    } else if (d->isPressed && !d->pressedPixmap.isNull())
+        painter->drawPixmap(0, 0, d->pressedPixmap);
+    else if (!d->normalPixmap.isNull())
+        painter->drawPixmap(0, 0, d->normalPixmap);
+
+
+    if (!d->text.isEmpty()) {
+        const QRect &textRect = boundingRect().toRect();
+
+        QFontMetrics metrics(font());
+        const QString &elidedText = metrics.elidedText(d->text, Qt::ElideRight,
+                                                       textRect.width());
+
+        painter->setFont(font());
+        painter->setPen(Qt::white);
+        painter->drawText(textRect, Qt::TextSingleLine | Qt::AlignCenter, elidedText);
+    }
+}