Import Upstream version 4.12.0upstream/4.12.0

2 files changed, 205 insertions, 0 deletions

diff --git a/src/widgets/scrolltext/scrolltext.cpp b/src/widgets/scrolltext/scrolltext.cpp
new file mode 100644
index 0000000..b03b761
--- /dev/null
+++ b/src/widgets/scrolltext/scrolltext.cpp
@@ -0,0 +1,152 @@
+#include "scrolltext.h"
+#include <QHoverEvent>
+#include <QPainter>
+
+ScrollText::ScrollText(QWidget *parent) : QWidget(parent), scrollPos(0) {
+
+  staticText.setTextFormat(Qt::PlainText);
+
+  setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+
+  setMinimumHeight(fontMetrics().height() + 10);
+  setMaximumHeight(this->minimumHeight() + 6);
+
+  leftMargin = 0; // 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::setLeftMargin(int pixels) {
+  leftMargin = pixels;
+  update();
+}
+
+void ScrollText::pause() {
+  if (scrollEnabled) {
+    timer.stop();
+  }
+}
+
+void ScrollText::resume() {
+  if (scrollEnabled) {
+    timer.start();
+    scrolledOnce = false;
+  }
+}
+
+void ScrollText::updateText() {
+  scrolledOnce = false;
+  timer.stop();
+
+  singleTextWidth = fontMetrics().horizontalAdvance(_text);
+  //    scrollEnabled = true;
+  scrollEnabled = (singleTextWidth > width() - leftMargin);
+
+  if (scrollEnabled) {
+    scrollPos = -64;
+    staticText.setText(_text + _separator);
+    timer.start();
+  } else {
+    staticText.setText(_text);
+  }
+  staticText.prepare(QTransform(), font());
+  // wholeTextSize = QSize(fontMetrics().width(staticText.text()),
+  // fontMetrics().height());
+  wholeTextSize = QSize(fontMetrics().horizontalAdvance(staticText.text()),
+                        fontMetrics().height());
+}
+
+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) +
+                            QPoint(2, 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((qreal)(qMax(-8, scrollPos) + 8) / 8.0);
+    pb.drawImage(0, 0, alphaChannel);
+    p.drawImage(0, 0, buffer);
+  } else {
+    p.drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, text());
+    //      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 = (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), (uchar *)scanline1, 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();
+  pauseAfterOneRotation(scrollPos);
+  update();
+}
+
+void ScrollText::pauseAfterOneRotation(int scrollPos) {
+  if (scrolledOnce == false && scrollPos + 2 == wholeTextSize.width()) {
+    scrolledOnce = true;
+  }
+  if (scrolledOnce) {
+    pause();
+  }
+}
diff --git a/src/widgets/scrolltext/scrolltext.h b/src/widgets/scrolltext/scrolltext.h
new file mode 100644
index 0000000..a660615
--- /dev/null
+++ b/src/widgets/scrolltext/scrolltext.h
@@ -0,0 +1,53 @@
+#ifndef SCROLLTEXT_H
+#define SCROLLTEXT_H
+
+#include <QWidget>
+#include <QStaticText>
+#include <QTimer>
+
+
+class ScrollText : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(QString text READ text WRITE setText)
+    Q_PROPERTY(QString separator READ separator WRITE setSeparator)
+
+public:
+    explicit ScrollText(QWidget *parent = 0);
+
+public slots:
+    QString text() const;
+    void setText(QString text);
+
+    QString separator() const;
+    void setSeparator(QString separator);
+    void setLeftMargin(int pixels);
+    void pause();
+    void resume();
+
+
+protected:
+    virtual void paintEvent(QPaintEvent *);
+    virtual void resizeEvent(QResizeEvent *);
+
+private:
+    void updateText();
+    QString _text;
+    QString _separator;
+    QStaticText staticText;
+    int singleTextWidth;
+    QSize wholeTextSize;
+    int leftMargin;
+    bool scrollEnabled;
+    int scrollPos;
+    QImage alphaChannel;
+    QImage buffer;
+    QTimer timer;
+    bool scrolledOnce = false;
+
+private slots:
+    virtual void timer_timeout();
+    void pauseAfterOneRotation(int scrollPos);
+};
+
+#endif // SCROLLTEXT_H