Hi,
Is there anybody interested in this feature? Or any
other comments?
2011/4/21 Sean Chou <[email protected]
<mailto:[email protected]>>
Hi,
I have a simple patch to demo the new behavior.
With the patch, the focus will go through the
radiobuttons with mnemonic key Y when alt+y is
pressed instead of select the last.
The patch is as follows:
diff -r 554adcfb615e
src/share/classes/javax/swing/KeyboardManager.java
--- a/src/share/classes/javax/swing/KeyboardManager.java
Wed Mar 16 15:01:07 2011 -0700
+++ b/src/share/classes/javax/swing/KeyboardManager.java
Thu Mar 17 14:57:14 2011 +0800
@@ -251,6 +251,93 @@
}
} else if ( tmp instanceof Vector) { //more than
one comp registered for this
Vector v = (Vector)tmp;
+
+ /* The below code is added to make sure the
focus is not always
+ transferred to the last component in the
vector when
+ more than one component have the same
mnemonic
+ */
+ if ((e.getModifiers()& Event.ALT_MASK)
== Event.ALT_MASK) {
+ /* Mnemonic key should transfer the
focus only, do not select.
+ * The following code works in this way:
+ * 1. If only one component in the
vector is visible, fireBinding on it.
+ * 2. If multi-components in the vector
are visible, move the focus to next component.
+ * 2.1 If the next component is not a
JAbstractButton, fireBinding on it.
+ * 2.2 If the next component is a
JMenu, which is a JAbstractButton, fireBinding
+ * on it to open the menu.
+ * 2.3 If the next component is
another JAbstractButton like JRadioButton. Request
+ * focus on it instead of
fireBinding. To AVOID SELECTION& CLICK of the button.
+ * 3. If the code is triggered by
release event, fireBinding on current focus component
+ * instead of move focus.
+ * 4. Further consideration: there may
be more swing control like JMenu, or customized
+ * controls, which may break this
behavior.
+ */
+ // This has alt as it's modifier so this
could be a mnemonic
+ Component focusOwner =
KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
+ {
+ // If only one visible component, invoke
it.
+ int visibleComponentCounter = 0;
+ int nextFocus = 0;
+ for (int i = 0; i< v.size(); i++){
+ JComponent c = (JComponent)
v.elementAt(i);
+ if (c.isShowing()&& c.isEnabled()){
+ visibleComponentCounter++ ;
+ nextFocus = i;
+ }
+ }
+ if (visibleComponentCounter == 1){
+ JComponent tmpc = (JComponent)
v.elementAt(nextFocus);
+ fireBinding(tmpc, ks, e, pressed);
+ if (e.isConsumed())
+ return true;
+ }
+ // If multi-components are visible, do
not select the button, just move the focus.
+ for (int counter = v.size() - 1;
counter>= 0; counter--) {
+ JComponent c = (JComponent)
v.elementAt(counter);
+ if (c.isShowing()&& c.isEnabled()) {
+ if ((c == focusOwner)
+ || (c instanceof
JLabel&& ((JLabel) c).getLabelFor() == focusOwner)) {
+ if (e.getID() ==
KeyEvent.KEY_RELEASED){
+ nextFocus =
counter;
+ break;
+ }
+ nextFocus = (counter - 1 +
v.size()) % v.size();
+ break;
+ }
+ }
+ }
+ for (; nextFocus>= 0; nextFocus--) {
+ JComponent c = (JComponent)
v.elementAt(nextFocus);
+ if (c.isShowing()&& c.isEnabled()) {
+ break;
+ }
+ }
+ if (nextFocus>= 0) {
+ JComponent tmpc = (JComponent)
v.elementAt(nextFocus);
+ // Next is the hack for this
accessibility:
+ // For general Buttons, do not press
them, but request focus only.
+ // For special buttons like JMenu,
needs press.
+ // If it is not a button, let the
component handles by itself.
+ if (!(tmpc instanceof
javax.swing.AbstractButton)){
+ fireBinding(tmpc, ks, e,
pressed);
+ if (e.isConsumed())
+ return true;
+ }
+ if (tmpc instanceof JMenu ) {
+ fireBinding(tmpc, ks, e,
pressed);
+ tmpc.requestFocusInWindow();
+ if (e.isConsumed())
+ return true;
+ } else {
+ boolean result =
tmpc.requestFocusInWindow();
+ e.consume();
+ return result;
+ }
+ }
+ // If it is not handled here, default
behavior is selecting the last.
+ }
+ }
+
+
// There is no well defined order for
WHEN_IN_FOCUSED_WINDOW
// bindings, but we give precedence to those
bindings just
// added. This is done so that JMenus
WHEN_IN_FOCUSED_WINDOW
2011/4/1 Sean Chou <[email protected]
<mailto:[email protected]>>
Hi all,
In daily use, we may encounter a problem of
mnemonic key: there may be several
controls want the same key to be set as
mnemonic key. It is not common but it does exist.
Current openjdk implementation allows users
to set a same mnemonic key for
different controls; but during the execution,
when the mnemonic key is pressed,
the last control always gets the action. Users
are not able to touch other controls with
that mnemonic key. This may confuse them.
If all the controls with the same mnemonic
key can be accessed through, for
example, when the mnemonic key is pressed, the
focus is moved to the last control,
and when the mnemonic key is pressed again, the
focus is moved to the second control
with that mnemonic, it will give user the
choice to select other controls.
Here is an example for the case:
package test;
import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
public class TestFocus extends JFrame {
public TestFocus() {
Container pane = getContentPane();
pane.setLayout(new BorderLayout());
JRadioButton btn1,btn2,btn3;
btn1 = new JRadioButton("Yes");
btn1.setMnemonic('Y');
btn2 = new JRadioButton("Yup");
btn2.setMnemonic('Y');
btn3 = new JRadioButton("No");
btn3.setMnemonic('N');
btn3.setSelected(true);
ButtonGroup group = new ButtonGroup();
group.add(btn1);
group.add(btn2);
group.add(btn3);
pane.add(btn1,BorderLayout.NORTH);
pane.add(btn2,BorderLayout.CENTER);
pane.add(btn3,BorderLayout.SOUTH);
setSize(200,200);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TestFocus();
}
}
--
Best Regards,
Sean Chou
--
Best Regards,
Sean Chou
--
Best Regards,
Sean Chou
