X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fgui%2Fmap%2FOverlayPanel.java;fp=src%2Ftim%2Fprune%2Fgui%2Fmap%2FOverlayPanel.java;h=e917e5a3d7227cc6a71b9e92a98807ae75e61846;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/gui/map/OverlayPanel.java b/src/tim/prune/gui/map/OverlayPanel.java
new file mode 100644
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);
+	}
+}