javax.swing.JRootPane#getDefaultButton ( )源码实例Demo

private static AbstractButton findDefaultButton(Container c, String txt) {
    if (c instanceof RootPaneContainer) {
        JRootPane root = ((RootPaneContainer) c).getRootPane();
        if (root == null) {
            return null;
        }
        AbstractButton btn = root.getDefaultButton();
        if (btn == null) {
            //Metal L&F does not set default button for JFileChooser
            Container parent = c;
            while (parent.getParent() != null && !(parent instanceof Dialog)) {
                parent = parent.getParent();
            }
            if (parent instanceof Dialog) {
                return findFileChooserAcceptButton ((Dialog) parent, txt);
            }
        } else {
            return btn;
        }
    }
    return null;
}
 

private void trySendEnterToDialog() {
    //        System.err.println("SendEnterToDialog");
    EventObject ev = EventQueue.getCurrentEvent();

    if (ev instanceof KeyEvent && (((KeyEvent) ev).getKeyCode() == KeyEvent.VK_ENTER)) {
        if (ev.getSource() instanceof JComboBox && ((JComboBox) ev.getSource()).isPopupVisible()) {
            return;
        }

        if (
            ev.getSource() instanceof JTextComponent &&
                ((JTextComponent) ev.getSource()).getParent() instanceof JComboBox &&
                ((JComboBox) ((JTextComponent) ev.getSource()).getParent()).isPopupVisible()
        ) {
            return;
        }

        JRootPane jrp = getRootPane();

        if (jrp != null) {
            JButton b = jrp.getDefaultButton();

            if ((b != null) && b.isEnabled()) {
                b.doClick();
            }
        }
    }
}
 

private void trySendEnterToDialog(BaseTable bt) {
    //        System.err.println("SendEnterToDialog");
    EventObject ev = EventQueue.getCurrentEvent();

    if (ev instanceof KeyEvent && (((KeyEvent) ev).getKeyCode() == KeyEvent.VK_ENTER)) {
        if (ev.getSource() instanceof JComboBox && ((JComboBox) ev.getSource()).isPopupVisible()) {
            return;
        }

        if (
            ev.getSource() instanceof JTextComponent &&
                ((JTextComponent) ev.getSource()).getParent() instanceof JComboBox &&
                ((JComboBox) ((JTextComponent) ev.getSource()).getParent()).isPopupVisible()
        ) {
            return;
        }

        JRootPane jrp = bt.getRootPane();

        if (jrp != null) {
            JButton b = jrp.getDefaultButton();

            if ((b != null) && b.isEnabled()) {
                b.doClick();
            }
        }
    }
}
 

private void workaround11364() {
    JRootPane root = getRootPane();
    if (root != null) {
        JButton defaultButton = root.getDefaultButton();
        if (defaultButton != null) {
            defaultButton.doClick();
        }
    }
}
 

public void actionPerformed(ActionEvent e) {
    int next = getSelectedRow() + (direction ? 1 : (-1));

    //if we're off the end, try to find a sibling component to pass
    //focus to
    if ((next >= getRowCount()) || (next < 0)) {
        if (!(BaseTable.this.getTopLevelAncestor() instanceof Dialog)) {
            //If we're not in a dialog, we're in the main window - don't
            //send focus somewhere because the winsys won't change the
            //active mode
            next = (next >= getRowCount()) ? 0 : (getRowCount() - 1);
        } else if ((next >= getRowCount()) || (next < 0)) {
            //if we're off the end, try to find a sibling component to pass
            //focus to
            //This code is a bit ugly, but works
            Container ancestor = getFocusCycleRootAncestor();

            //Find the next component in our parent's focus cycle
            Component sibling = direction
                ? ancestor.getFocusTraversalPolicy().getComponentAfter(ancestor, BaseTable.this.getParent())
                : ancestor.getFocusTraversalPolicy().getComponentBefore(ancestor, BaseTable.this);

            //Often LayoutFocusTranferPolicy will return ourselves if we're
            //the last.  First try to find a parent focus cycle root that
            //will be a little more polite
            if (sibling == BaseTable.this) {
                Container grandcestor = ancestor.getFocusCycleRootAncestor();

                if (grandcestor != null) {
                    sibling = direction
                        ? grandcestor.getFocusTraversalPolicy().getComponentAfter(grandcestor, ancestor)
                        : grandcestor.getFocusTraversalPolicy().getComponentBefore(grandcestor, ancestor);
                    ancestor = grandcestor;
                }
            }

            //Okay, we still ended up with ourselves, or there is only one focus
            //cycle root ancestor.  Try to find the first component according to
            //the policy
            if (sibling == BaseTable.this) {
                if (ancestor.getFocusTraversalPolicy().getFirstComponent(ancestor) != null) {
                    sibling = ancestor.getFocusTraversalPolicy().getFirstComponent(ancestor);
                }
            }

            //If we're *still* getting ourselves, find the default button and punt
            if (sibling == BaseTable.this) {
                JRootPane rp = getRootPane();
                JButton jb = rp.getDefaultButton();

                if (jb != null) {
                    sibling = jb;
                }
            }

            //See if it's us, or something we know about, and if so, just
            //loop around to the top or bottom row - there's noplace
            //interesting for focus to go to
            if (sibling != null) {
                if (sibling == BaseTable.this) {
                    //set the selection if there's nothing else to do
                    changeSelection(
                        direction ? 0 : (getRowCount() - 1), direction ? 0 : (getColumnCount() - 1), false,
                        false
                    );
                } else {
                    //Request focus on the sibling
                    sibling.requestFocus();
                }

                return;
            }
        }

        changeSelection(next, getSelectedColumn(), false, false);
    }

    if( getSelectionModel().getAnchorSelectionIndex() < 0 )
        getSelectionModel().setAnchorSelectionIndex(next);
    getSelectionModel().setLeadSelectionIndex(next);
}
 

@Override
public void actionPerformed(ActionEvent e) {
    if (isEditing()) {
        removeEditor();
    }
    int targetRow;
    int targetColumn;
    if (direction) {
        if (getSelectedColumn() == getColumnCount()-1) {
            targetColumn=0;
            targetRow = getSelectedRow()+1;
        } else {
            targetColumn = getSelectedColumn()+1;
            targetRow = getSelectedRow();
        }
    } else {
        if (getSelectedColumn() == 0) {
            targetColumn = getColumnCount()-1;
            targetRow = getSelectedRow()-1;
        } else {
            targetRow = getSelectedRow();
            targetColumn = getSelectedColumn() -1;
        }
    }
    
    //if we're off the end, try to find a sibling component to pass
    //focus to
    if (targetRow >= getRowCount() || targetRow < 0) {
        //This code is a bit ugly, but works
        Container ancestor = getFocusCycleRootAncestor();
        //Find the next component in our parent's focus cycle
        Component sibling = direction ?
            ancestor.getFocusTraversalPolicy().getComponentAfter(ancestor,
            ETable.this) :
            ancestor.getFocusTraversalPolicy().getComponentBefore(ancestor,
            ETable.this);
            

        //Often LayoutFocusTranferPolicy will return ourselves if we're
        //the last.  First try to find a parent focus cycle root that
        //will be a little more polite
        if (sibling == ETable.this) {
            Container grandcestor = ancestor.getFocusCycleRootAncestor();
            if (grandcestor != null) {
                sibling = direction ? grandcestor.getFocusTraversalPolicy().getComponentAfter(grandcestor, ancestor) :
                    grandcestor.getFocusTraversalPolicy().getComponentBefore(grandcestor, ancestor);
                ancestor = grandcestor;
            }
        }
         
        //Okay, we still ended up with ourselves, or there is only one focus
        //cycle root ancestor.  Try to find the first component according to
        //the policy
        if (sibling == ETable.this) {
            if (ancestor.getFocusTraversalPolicy().getFirstComponent(ancestor) != null) {
                sibling = ancestor.getFocusTraversalPolicy().getFirstComponent(ancestor);
            }
        }
        
        //If we're *still* getting ourselves, find the default button and punt
        if (sibling == ETable.this) {
            JRootPane rp = getRootPane();
            JButton jb = rp.getDefaultButton();
            if (jb != null) {
                sibling = jb;
            }
        }
            
        //See if it's us, or something we know about, and if so, just
        //loop around to the top or bottom row - there's noplace
        //interesting for focus to go to
        if (sibling != null) {
            if (sibling == ETable.this) {
                //set the selection if there's nothing else to do
                changeSelection(direction ? 0 : getRowCount()-1, 
                    direction ? 0 : getColumnCount()-1,false,false);
            } else {
                //Request focus on the sibling
                sibling.requestFocus();
            }
            return;
        }
    }
    changeSelection (targetRow, targetColumn, false, false);
}