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project/fm_viewer/ui/QProgressIndicator.cpp

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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2011 Morgan Leborgne
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "QProgressIndicator.h"
+
+#include <QPainter>
+#include <QDebug>
+
+QProgressIndicator::QProgressIndicator(QWidget* parent)
+    : QWidget(parent),
+      m_angle(0),
+      m_timerId(-1),
+      m_delay(40),
+      m_displayedWhenStopped(false),
+      m_color(QColor(0xc2c4d6)) //Qt::white)
+{
+    setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+    setFixedSize(50,50);
+    setFocusPolicy(Qt::NoFocus);
+}
+
+bool QProgressIndicator::isAnimated () const
+{
+    return (m_timerId != -1);
+}
+
+void QProgressIndicator::setDisplayedWhenStopped(bool state)
+{
+    m_displayedWhenStopped = state;
+
+    update();
+}
+
+bool QProgressIndicator::isDisplayedWhenStopped() const
+{
+    return m_displayedWhenStopped;
+}
+
+void QProgressIndicator::startAnimation()
+{
+    m_angle = 0;
+
+    if (m_timerId == -1)
+        m_timerId = startTimer(m_delay);
+}
+
+void QProgressIndicator::stopAnimation()
+{
+    if (m_timerId != -1)
+        killTimer(m_timerId);
+
+    m_timerId = -1;
+
+    update();
+}
+
+void QProgressIndicator::setAnimationDelay(int delay)
+{
+    if (m_timerId != -1)
+        killTimer(m_timerId);
+
+    m_delay = delay;
+
+    if (m_timerId != -1)
+        m_timerId = startTimer(m_delay);
+}
+
+void QProgressIndicator::setColor(const QColor & color)
+{
+    m_color = color;
+
+    update();
+}
+
+QSize QProgressIndicator::sizeHint() const
+{
+    return QSize(20,20);
+}
+
+int QProgressIndicator::heightForWidth(int w) const
+{
+    return w;
+}
+
+void QProgressIndicator::timerEvent(QTimerEvent * /*event*/)
+{
+    m_angle = (m_angle+30)%360;
+
+    update();
+}
+
+void QProgressIndicator::paintEvent(QPaintEvent * /*event*/)
+{
+    if (!m_displayedWhenStopped && !isAnimated())
+        return;
+
+    int width = qMin(this->width(), this->height());
+    
+    QPainter p(this);
+    p.setRenderHint(QPainter::Antialiasing);
+    
+//    qInfo() << width;
+
+    int outerRadius = (width-1)*0.5;
+    int innerRadius = (width-1)*0.5*0.6;
+
+    int capsuleHeight = outerRadius - innerRadius;
+    int capsuleWidth  = (width > 32 ) ? capsuleHeight *.35 : capsuleHeight *.35;
+    int capsuleRadius = capsuleWidth/2;
+
+    for (int i=0; i<12; i++)
+    {
+        QColor color = m_color;
+        color.setAlphaF(1.0f - (i/12.0f));
+        p.setPen(Qt::NoPen);
+        p.setBrush(color);       
+        p.save();
+        p.translate(rect().center());
+        p.rotate(m_angle - i*30.0f);
+        p.drawRoundedRect(-capsuleWidth*0.5, -(innerRadius+capsuleHeight), capsuleWidth, capsuleHeight, capsuleRadius, capsuleRadius);
+        p.restore();
+    }
+}