com.alee.laf.AltProcessor Maven / Gradle / Ivy
/*
* This file is part of WebLookAndFeel library.
*
* WebLookAndFeel library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WebLookAndFeel library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WebLookAndFeel library. If not, see .
*/
package com.alee.laf;
import com.alee.utils.CoreSwingUtils;
import javax.swing.*;
import javax.swing.plaf.basic.ComboPopup;
import java.awt.*;
import java.awt.event.KeyEvent;
/**
* Alt hotkey processor for application windows with menu.
*
* @author Mikle Garin
*/
public class AltProcessor implements KeyEventPostProcessor
{
/**
* Runtime variables.
*/
private static boolean altKeyPressed = false;
private static boolean menuCanceledOnPress = false;
private static JRootPane root = null;
private static Window winAncestor = null;
@Override
public boolean postProcessKeyEvent ( final KeyEvent ev )
{
if ( ev.isConsumed () )
{
// Ignoring consumed events
return false;
}
if ( ev.getKeyCode () == KeyEvent.VK_ALT )
{
root = SwingUtilities.getRootPane ( ev.getComponent () );
winAncestor = root == null ? null : CoreSwingUtils.getWindowAncestor ( root );
if ( ev.getID () == KeyEvent.KEY_PRESSED )
{
if ( !altKeyPressed )
{
altPressed ( ev );
}
altKeyPressed = true;
return true;
}
else if ( ev.getID () == KeyEvent.KEY_RELEASED )
{
if ( altKeyPressed )
{
altReleased ();
}
else
{
final MenuSelectionManager msm = MenuSelectionManager.defaultManager ();
final MenuElement[] path = msm.getSelectedPath ();
if ( path.length <= 0 )
{
WebLookAndFeel.setMnemonicHidden ( true );
repaintMnemonicsInWindow ( winAncestor );
}
}
altKeyPressed = false;
}
root = null;
winAncestor = null;
}
else
{
altKeyPressed = false;
}
return false;
}
/**
* Processes alt hotkey press event.
*
* @param ev key event
*/
private void altPressed ( final KeyEvent ev )
{
final MenuSelectionManager msm = MenuSelectionManager.defaultManager ();
final MenuElement[] path = msm.getSelectedPath ();
if ( path.length > 0 && !( path[ 0 ] instanceof ComboPopup ) )
{
msm.clearSelectedPath ();
menuCanceledOnPress = true;
ev.consume ();
}
else if ( path.length > 0 )
{
// In case combobox had focus
menuCanceledOnPress = false;
WebLookAndFeel.setMnemonicHidden ( false );
repaintMnemonicsInWindow ( winAncestor );
ev.consume ();
}
else
{
menuCanceledOnPress = false;
WebLookAndFeel.setMnemonicHidden ( false );
repaintMnemonicsInWindow ( winAncestor );
JMenuBar mbar = root != null ? root.getJMenuBar () : null;
if ( mbar == null && winAncestor instanceof JFrame )
{
mbar = ( ( JFrame ) winAncestor ).getJMenuBar ();
}
final JMenu menu = mbar != null ? mbar.getMenu ( 0 ) : null;
if ( menu != null )
{
ev.consume ();
}
}
}
/**
* Processes alt hotkey release event.
*/
private void altReleased ()
{
if ( menuCanceledOnPress )
{
WebLookAndFeel.setMnemonicHidden ( true );
repaintMnemonicsInWindow ( winAncestor );
return;
}
final MenuSelectionManager msm = MenuSelectionManager.defaultManager ();
if ( msm.getSelectedPath ().length == 0 )
{
// Activating menu bar
JMenuBar mbar = root != null ? root.getJMenuBar () : null;
if ( mbar == null && winAncestor instanceof JFrame )
{
mbar = ( ( JFrame ) winAncestor ).getJMenuBar ();
}
final JMenu menu = mbar != null ? mbar.getMenu ( 0 ) : null;
if ( menu != null )
{
final MenuElement[] path = new MenuElement[ 2 ];
path[ 0 ] = mbar;
path[ 1 ] = menu;
msm.setSelectedPath ( path );
}
else if ( !WebLookAndFeel.isMnemonicHidden () )
{
WebLookAndFeel.setMnemonicHidden ( true );
repaintMnemonicsInWindow ( winAncestor );
}
}
else
{
if ( ( msm.getSelectedPath () )[ 0 ] instanceof ComboPopup )
{
WebLookAndFeel.setMnemonicHidden ( true );
repaintMnemonicsInWindow ( winAncestor );
}
}
}
/**
* Repaints all components that contain mnemonics in specified window and all of its owned windows.
*
* @param w window to process
*/
private void repaintMnemonicsInWindow ( final Window w )
{
if ( w == null || !w.isShowing () )
{
return;
}
final Window[] ownedWindows = w.getOwnedWindows ();
for ( final Window ownedWindow : ownedWindows )
{
repaintMnemonicsInWindow ( ownedWindow );
}
repaintMnemonicsInContainer ( w );
}
/**
* Repaints all components that contain mnemonics in specified container and all of its owned containers.
*
* @param cont container to process
*/
private void repaintMnemonicsInContainer ( final Container cont )
{
Component c;
for ( int i = 0; i < cont.getComponentCount (); i++ )
{
c = cont.getComponent ( i );
if ( c == null || !c.isVisible () )
{
continue;
}
if ( c instanceof AbstractButton && ( ( AbstractButton ) c ).getMnemonic () != '\0' )
{
c.repaint ();
continue;
}
else if ( c instanceof JLabel && ( ( JLabel ) c ).getDisplayedMnemonic () != '\0' )
{
c.repaint ();
continue;
}
if ( c instanceof Container )
{
repaintMnemonicsInContainer ( ( Container ) c );
}
}
}
}