diff examples/gui/swing/BLDComponent.java @ 1:5df24c91468d

Oh my what a mess.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/gui/swing/BLDComponent.java	Fri Apr 05 16:26:00 2019 +0100
@@ -0,0 +1,101 @@
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+/** A rectangle that has a fixed size. */
+class BLDComponent extends JComponent {
+    private Color normalHue;
+    private final Dimension preferredSize;
+    private String name;
+    private boolean restrictMaximumSize;
+    private boolean printSize;
+
+    public BLDComponent(float alignmentX, float hue, 
+                     int shortSideSize,
+                     boolean restrictSize, 
+                     boolean printSize, 
+                     String name) {
+        this.name = name;
+        this.restrictMaximumSize = restrictSize;
+        this.printSize = printSize;
+        setAlignmentX(alignmentX);
+        normalHue = Color.getHSBColor(hue, 0.4f, 0.85f);
+        preferredSize = new Dimension(shortSideSize*2, shortSideSize);
+
+        MouseListener l = new MouseAdapter() {
+            public void mousePressed(MouseEvent e) {
+                int width = getWidth();
+                float alignment = (float)(e.getX())
+                                / (float)width;
+
+                // Round to the nearest 1/10th.
+                int tmp = Math.round(alignment * 10.0f); 
+                alignment = (float)tmp / 10.0f;
+
+                setAlignmentX(alignment);
+                revalidate(); // this GUI needs relayout
+                repaint();
+            }
+        };
+        addMouseListener(l);
+    }
+
+    /**
+     * Our BLDComponents are completely opaque, so we override
+     * this method to return true.  This lets the painting
+     * system know that it doesn't need to paint any covered
+     * part of the components underneath this component.  The
+     * end result is possibly improved painting performance.
+     */
+    public boolean isOpaque() {
+        return true;
+    }
+
+    public void paint(Graphics g) {
+        int width = getWidth();
+        int height = getHeight();
+        float alignmentX = getAlignmentX();
+
+        g.setColor(normalHue);
+        g.fill3DRect(0, 0, width, height, true);
+
+        /* Draw a vertical white line at the alignment point.*/
+        // XXX: This code is probably not the best.
+        g.setColor(Color.white);
+        int x = (int)(alignmentX * (float)width) - 1;
+        g.drawLine(x, 0, x, height - 1);
+
+        /* Say what the alignment point is. */
+        g.setColor(Color.black);
+        g.drawString(Float.toString(alignmentX), 3, height - 3);
+
+        if (printSize) {
+            System.out.println("BLDComponent " + name + ": size is " 
+                               + width + "x" + height
+                               + "; preferred size is " 
+                               + getPreferredSize().width + "x"
+                               + getPreferredSize().height);
+        }
+    }
+
+    public Dimension getPreferredSize() {
+        return preferredSize;
+    }
+
+    public Dimension getMinimumSize() {
+        return preferredSize;
+    }
+
+    public Dimension getMaximumSize() {
+        if (restrictMaximumSize) {
+            return preferredSize;
+        } else {
+            return super.getMaximumSize();
+        }
+    }
+
+    public void setSizeRestriction(boolean restrictSize) {
+        restrictMaximumSize = restrictSize;
+    }
+
+}