Merge master with some older CI changes

1 files changed, 135 insertions, 0 deletions

diff --git a/src/scrolltext.cpp b/src/scrolltext.cpp
new file mode 100644
index 00000000..d5da6ce5
--- /dev/null
+++ b/src/scrolltext.cpp
@@ -0,0 +1,135 @@
+#include "scrolltext.h"
+
+ScrollText::ScrollText(QWidget *parent) : QWidget(parent), scrollPos(0)
+{
+  staticText.setTextFormat(Qt::PlainText);
+
+  //    setFixedHeight(fontMetrics().height()*2); //The theme sets this
+  leftMargin = height() / 3;
+
+  setSeparator("   ---   ");
+
+  connect(&timer, SIGNAL(timeout()), this, SLOT(timer_timeout()));
+  timer.setInterval(50);
+}
+
+QString ScrollText::text() const { return _text; }
+
+void ScrollText::setText(QString text)
+{
+  _text = text;
+  updateText();
+  update();
+}
+
+QString ScrollText::separator() const { return _separator; }
+
+void ScrollText::setSeparator(QString separator)
+{
+  _separator = separator;
+  updateText();
+  update();
+}
+
+void ScrollText::updateText()
+{
+  timer.stop();
+#if QT_VERSION > QT_VERSION_CHECK(5, 11, 0)
+  singleTextWidth = fontMetrics().horizontalAdvance(_text);
+#else
+  singleTextWidth = fontMetrics().boundingRect(_text).width();
+#endif
+
+  scrollEnabled = (singleTextWidth > width() - leftMargin * 2);
+
+  if (scrollEnabled) {
+    scrollPos = -64;
+    staticText.setText(_text + _separator);
+    timer.start();
+  }
+  else
+    staticText.setText(_text);
+
+  staticText.prepare(QTransform(), font());
+#if QT_VERSION > QT_VERSION_CHECK(5, 11, 0)
+  wholeTextSize = QSize(fontMetrics().horizontalAdvance(staticText.text()),
+                        fontMetrics().height());
+#else
+  wholeTextSize = QSize(fontMetrics().boundingRect(staticText.text()).width(),
+                        fontMetrics().height());
+#endif
+
+}
+
+void ScrollText::paintEvent(QPaintEvent *)
+{
+  QPainter p(this);
+
+  if (scrollEnabled) {
+    buffer.fill(qRgba(0, 0, 0, 0));
+    QPainter pb(&buffer);
+    pb.setPen(p.pen());
+    pb.setFont(p.font());
+
+    int x = qMin(-scrollPos, 0) + leftMargin;
+    while (x < width()) {
+      pb.drawStaticText(QPointF(x, (height() - wholeTextSize.height()) / 2),
+                        staticText);
+      x += wholeTextSize.width();
+    }
+
+    // Apply Alpha Channel
+    pb.setCompositionMode(QPainter::CompositionMode_DestinationIn);
+    pb.setClipRect(width() - 15, 0, 15, height());
+    pb.drawImage(0, 0, alphaChannel);
+    pb.setClipRect(0, 0, 15, height());
+    // initial situation: don't apply alpha channel in the left half of the
+    // image at all; apply it more and more until scrollPos gets positive
+    if (scrollPos < 0)
+      pb.setOpacity(static_cast<qreal>((qMax(-8, scrollPos) + 8) / 8.0));
+    pb.drawImage(0, 0, alphaChannel);
+
+    // pb.end();
+    p.drawImage(0, 0, buffer);
+  }
+  else {
+    p.drawStaticText(
+        QPointF(leftMargin, (height() - wholeTextSize.height()) / 2),
+        staticText);
+  }
+}
+
+void ScrollText::resizeEvent(QResizeEvent *)
+{
+  // When the widget is resized, we need to update the alpha channel.
+
+  alphaChannel = QImage(size(), QImage::Format_ARGB32_Premultiplied);
+  buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
+
+  // Create Alpha Channel:
+  if (width() > 64) {
+    // create first scanline
+    QRgb *scanline1 = reinterpret_cast<QRgb *>(alphaChannel.scanLine(0));
+    for (int x = 1; x < 16; ++x)
+      scanline1[x - 1] = scanline1[width() - x] = qRgba(0, 0, 0, x << 4);
+    for (int x = 15; x < width() - 15; ++x)
+      scanline1[x] = qRgb(0, 0, 0);
+    // copy scanline to the other ones
+    for (int y = 1; y < height(); ++y)
+      memcpy(alphaChannel.scanLine(y), scanline1,
+             static_cast<uint>(width() * 4));
+  }
+  else
+    alphaChannel.fill(qRgb(0, 0, 0));
+
+  // Update scrolling state
+  bool newScrollEnabled = (singleTextWidth > width() - leftMargin);
+  if (newScrollEnabled != scrollEnabled)
+    updateText();
+}
+
+void ScrollText::timer_timeout()
+{
+  scrollPos = (scrollPos + 2) % wholeTextSize.width();
+  update();
+}