1 files changed, 92 insertions, 0 deletions
diff --git a/python/edu/learn-python/src/com/jetbrains/python/edu/ui/StudyProgressBar.java b/python/edu/learn-python/src/com/jetbrains/python/edu/ui/StudyProgressBar.java
new file mode 100644
index 000000000000..97fa00d0f70d
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+++ b/python/edu/learn-python/src/com/jetbrains/python/edu/ui/StudyProgressBar.java
@@ -0,0 +1,92 @@
+package com.jetbrains.python.edu.ui;
+
+import com.intellij.openapi.project.DumbAware;
+import com.intellij.openapi.ui.GraphicsConfig;
+import com.intellij.ui.ColorUtil;
+import com.intellij.ui.Gray;
+import com.intellij.ui.JBColor;
+import com.intellij.util.ui.GraphicsUtil;
+import com.intellij.util.ui.UIUtil;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.geom.Rectangle2D;
+
+public class StudyProgressBar extends JComponent implements DumbAware {
+  public static final Color BLUE = JBColor.BLUE;
+  private static final Color SHADOW1 = new JBColor(Gray._190, JBColor.border());
+  private static final Color SHADOW2 = Gray._105;
+  private static final int BRICK_WIDTH = 10;
+  private static final int BRICK_SPACE = 2;
+  private final int myHeight;
+  private final int myIndent;
+  private double myFraction = 0.0;
+  private Color myColor = BLUE;
+
+  public StudyProgressBar(double fraction, Color color, int height, int indent) {
+    myFraction = fraction;
+    myColor = color;
+    myHeight = height;
+    myIndent = indent;
+  }
+
+  private int getBricksToDraw(double fraction) {
+    int bricksTotal = (getWidth() - 8) / (BRICK_WIDTH + BRICK_SPACE);
+    return (int)(bricksTotal * fraction) + 1;
+  }
+
+  protected void paintComponent(Graphics g) {
+    final GraphicsConfig config = GraphicsUtil.setupAAPainting(g);
+    Graphics2D g2 = (Graphics2D)g;
+    if (myFraction > 1) {
+      myFraction = 1;
+    }
+
+    Dimension size = getSize();
+    double width = size.getWidth() - 2*myIndent;
+    g2.setPaint(UIUtil.getListBackground());
+    Rectangle2D rect = new Rectangle2D.Double(myIndent, 0, width, myHeight);
+    g2.fill(rect);
+
+    g2.setPaint(new JBColor(SHADOW1, JBColor.border()));
+    rect.setRect(myIndent, 0, width, myHeight);
+    int arcWidth = 5;
+    int arcHeight = 5;
+    g2.drawRoundRect(myIndent, 0, (int)width, myHeight, arcWidth, arcHeight);
+    g2.setPaint(SHADOW2);
+    g2.drawRoundRect(myIndent, 0, (int)width, myHeight, arcWidth, arcHeight);
+
+    int y_center = myHeight / 2;
+    int y_steps = myHeight / 2 - 3;
+    int alpha_step = y_steps > 0 ? (255 - 70) / y_steps : 255 - 70;
+    int x_offset = 4;
+
+    g.setClip(4 + myIndent, 3, (int)width - 6, myHeight - 4);
+
+    int bricksToDraw = myFraction == 0 ? 0 : getBricksToDraw(myFraction);
+    for (int i = 0; i < bricksToDraw; i++) {
+      g2.setPaint(myColor);
+      UIUtil.drawLine(g2, x_offset, y_center, x_offset + BRICK_WIDTH - 1, y_center);
+      for (int j = 0; j < y_steps; j++) {
+        Color color = ColorUtil.toAlpha(myColor, 255 - alpha_step * (j + 1));
+        g2.setPaint(color);
+        UIUtil.drawLine(g2, x_offset, y_center - 1 - j, x_offset + BRICK_WIDTH - 1, y_center - 1 - j);
+        if (!(y_center % 2 != 0 && j == y_steps - 1)) {
+          UIUtil.drawLine(g2, x_offset, y_center + 1 + j, x_offset + BRICK_WIDTH - 1, y_center + 1 + j);
+        }
+      }
+      g2.setColor(
+        ColorUtil.toAlpha(myColor, 255 - alpha_step * (y_steps / 2 + 1)));
+      g2.drawRect(x_offset, y_center - y_steps, BRICK_WIDTH - 1, myHeight - 7);
+      x_offset += BRICK_WIDTH + BRICK_SPACE;
+    }
+    config.restore();
+  }
+
+  @Override
+  public Dimension getMaximumSize() {
+    Dimension dimension = super.getMaximumSize();
+    dimension.height = myHeight + 10;
+    return dimension;
+  }
+}