Moved source into separate src directory due to popular request

[GpsPrune.git] / src / tim / prune / gui / map / OverlayPanel.java

diff --git a/src/tim/prune/gui/map/OverlayPanel.java b/src/tim/prune/gui/map/OverlayPanel.java
new file mode 100644 (file)
index 0000000..e917e5a
--- /dev/null
+++ b/src/tim/prune/gui/map/OverlayPanel.java
@@ -0,0 +1,69 @@
+package tim.prune.gui.map;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics;
+
+import javax.swing.JPanel;
+
+/**
+ * Semi-transparent panel to go on top of the map
+ * to contain a set of controls
+ */
+public class OverlayPanel extends JPanel
+{
+       // Previous dimensions to see if calculations necessary
+       private int _prevWidth = -1, _prevHeight = -1;
+       // Previously calculated border limits
+       private int _minX, _minY, _width, _height;
+
+       /**
+        * Constructor
+        */
+       public OverlayPanel()
+       {
+               setOpaque(false);
+       }
+
+       /**
+        * Paint the contents
+        */
+       public void paint(Graphics g)
+       {
+               int panelWidth = getWidth();
+               int panelHeight = getHeight();
+               if (panelWidth != _prevWidth || panelHeight != _prevHeight)
+               {
+                       calculateBorder();
+                       _prevWidth = panelWidth;
+                       _prevHeight = panelHeight;
+               }
+               // Draw white background
+               final Color BG = new Color(255, 255, 255, 200);
+               g.setColor(BG);
+               g.fillRect(_minX, _minY, _width, _height);
+               // Draw black border
+               g.setColor(Color.BLACK);
+               g.drawRect(_minX, _minY, _width, _height);
+               // Paint everything else
+               super.paint(g);
+       }
+
+       /**
+        * Calculate the boundaries to paint over
+        */
+       private void calculateBorder()
+       {
+               final int PADDING = 2;
+               // Calculate where the border should be drawn
+               final Component firstComp = getComponent(0);
+               final Component lastComp = getComponent(getComponentCount()-1);
+               _minX = Math.max(firstComp.getX() - PADDING, 0);
+               final int maxX = Math.min(lastComp.getX() + lastComp.getWidth() + PADDING, getWidth()-1);
+               _width = maxX - _minX;
+               _minY = Math.max(Math.min(firstComp.getY(), lastComp.getY()) - PADDING, 0);
+               final int maxY = Math.max(firstComp.getY()+firstComp.getHeight(), lastComp.getY()+lastComp.getHeight()) + PADDING;
+               _height = maxY - _minY;
+               //System.out.println("x from " + minx + " to " + maxx + ", y from " + miny + " to " + maxy);
+       }
+}