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Java Programming Code Examples

Java > Applets Code Examples

Canvas (Tab Capturing Canvas)

Canvas (Tab Capturing Canvas) import java.applet.Applet; import java.awt.*; import java.awt.event.*; /** * This Canvas class show how to make a canvas part of the tab sequece * so that it can be reached by pressing the tab key. It also shows * how to prevent tab from getting focus to leave the Canvas by * consuming the event before it gets propogated to the containing * Window. */ public class TabCapturingCanvas extends Canvas { /** * Constructor. */ public TabCapturingCanvas() { setBackground(Color.green); // Key events must be enabled so that the canvas can consume them. enableEvents(AWTEvent.KEY_EVENT_MASK); } // constructor() /** * Override processKeyEvent so that it consumes tab key events. * Since consumed AWT events are not delivered to listeners, tab key * events that are delivered to this Canvas will not be dispatched * to the Window that is listening for them, so the Window will * never have the opportinity to respond to the tab by requesting a * change of focus. */ protected void processKeyEvent(KeyEvent e) { if (e.getKeyCode() == ' ') { e.consume(); return; } // if super.processKeyEvent(e); } // processKeyEvent(KeyEvent) /** * Returns whether this component can be traversed using * Tab or Shift-Tab keyboard focus traversal. If this method * returns "false", this component may still request the keyboard * focus using requestFocus(), but it will not automatically * be assigned focus during tab traversal. */ public boolean isFocusTraversable() { return true; } public Dimension getMinimumSize() { return new Dimension(50,50); } // getMinimumSize() public Dimension getPreferredSize() { return new Dimension(50,50); } // getPreferredSize() } // class TabCapturingCanvas