/*
* Code borrowed from PyDev
*/
package org.erlide.ui;
import org.eclipse.jface.bindings.TriggerSequence;
import org.eclipse.jface.bindings.keys.KeySequence;
import org.eclipse.jface.bindings.keys.KeyStroke;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.keys.IBindingService;
import org.eclipse.ui.texteditor.ITextEditorActionDefinitionIds;
/**
* Helper for knowing about keybindings and related actions
*
* @author Fabio
*/
public class KeyBindingHelper {
// pre-defined helpers
/**
* @return true if the given event matches a content assistant keystroke
* (and false otherwise).
*/
public static boolean matchesContentAssistKeybinding(final KeyEvent event) {
return matchesKeybinding(event,
ITextEditorActionDefinitionIds.CONTENT_ASSIST_PROPOSALS);
}
/**
* @return the key sequence that is the best match for a content assist
* request.
*/
public static KeySequence getContentAssistProposalBinding() {
return getCommandKeyBinding(ITextEditorActionDefinitionIds.CONTENT_ASSIST_PROPOSALS);
}
/**
* @return true if the given event matches a quick assistant keystroke (and
* false otherwise).
*/
public static boolean matchesQuickAssistKeybinding(final KeyEvent event) {
return matchesKeybinding(event, ITextEditorActionDefinitionIds.QUICK_ASSIST);
}
/**
* @return the key sequence that is the best match for a quick assist
* request.
*/
public static KeySequence getQuickAssistProposalBinding() {
return getCommandKeyBinding(ITextEditorActionDefinitionIds.QUICK_ASSIST);
}
// END pre-defined helpers
/**
* @param event
* the key event to be checked
* @param commandId
* the command to be checked
* @return true if the given key event can trigger the passed command (and
* false otherwise).
*/
public static boolean matchesKeybinding(final KeyEvent event, final String commandId) {
final IBindingService bindingSvc = (IBindingService) PlatformUI.getWorkbench()
.getAdapter(IBindingService.class);
final TriggerSequence[] activeBindingsFor = bindingSvc
.getActiveBindingsFor(commandId);
for (final TriggerSequence seq : activeBindingsFor) {
if (seq instanceof KeySequence) {
final KeySequence keySequence = (KeySequence) seq;
final KeyStroke[] keyStrokes = keySequence.getKeyStrokes();
for (final KeyStroke keyStroke : keyStrokes) {
if (keyStroke.getNaturalKey() == event.keyCode
&& (keyStroke.getModifierKeys() & event.stateMask) != 0) {
return true;
}
}
}
}
return false;
}
/**
* @param commandId
* the command we want to know about
* @return the 'best' key sequence that will activate the given command
*/
public static KeySequence getCommandKeyBinding(final String commandId) {
final IBindingService bindingSvc = (IBindingService) PlatformUI.getWorkbench()
.getAdapter(IBindingService.class);
final TriggerSequence binding = bindingSvc.getBestActiveBindingFor(commandId);
if (binding instanceof KeySequence) {
return (KeySequence) binding;
}
return null;
}
}