进度更新

gui/spkloading.cpp

@@ -0,0 +1,78 @@
+
+#include <QPaintEvent>
+#include <QPainter>
+#include "spkloading.h"
+
+SpkLoading::SpkLoading(QWidget *parent) : QWidget(parent)
+{
+  setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Minimum);
+  mAnimTimer = new QTimeLine(400, this);
+  mAnimTimer->setFrameRange(10, 30);
+  mAnimTimer->setEasingCurve(QEasingCurve::InCubic);
+  for(int i = 0; i < 5; i++)
+    mSizeList.append(20);
+  connect(mAnimTimer, &QTimeLine::frameChanged, this, &SpkLoading::timer);
+  connect(mAnimTimer, &QTimeLine::finished, this, &SpkLoading::loop);
+}
+
+void SpkLoading::paintEvent(QPaintEvent *e)
+{
+  QPainter p(this);
+  QPen pen(Qt::NoPen);
+  QBrush b({ 0, 0x7b, 0xff }, Qt::SolidPattern); // TODO: Customizable accent color
+  p.setBrush(b);
+  p.setPen(pen);
+  p.setRenderHint(QPainter::Antialiasing);
+  dx = width() / 2 - dh * 2;
+  dy = height() / 2;
+
+  double r;
+  for(int i = 0; i < 5; i++)
+  {
+    r = dh * mSizeList[i] / 80;
+    p.drawEllipse({ dx, dy }, r, r);
+    dx += dh;
+  }
+  e->accept();
+}
+
+void SpkLoading::resizeEvent(QResizeEvent *e)
+{
+  // Calculate size of drawing space
+  if(mUserHeight != 0 && mUserHeight * 5 <= e->size().width())
+  {
+    dw = 5 * mUserHeight;
+    dh = mUserHeight;
+    return;
+  }
+  dh = e->size().height();
+  if(width() < dh * 5)
+  {
+    dw = e->size().width();
+    dh = dw / 5;
+  }
+  else
+    dw = dh * 5;
+}
+
+void SpkLoading::timer(int s)
+{
+  for(int i = 4; i > 0; i--)
+    mSizeList[i] = mSizeList[i - 1];
+  mSizeList[0] = s;
+  update();
+}
+
+void SpkLoading::loop()
+{
+  mAnimTimer->setDirection(mAnimTimer->direction() == QTimeLine::Forward ?
+                             QTimeLine::Backward : QTimeLine::Forward);
+  mAnimTimer->start();
+}
+
+void SpkLoading::reset()
+{
+  for(int i = 0; i < 5; i++)
+    mSizeList[i] = 20;
+  update();
+}