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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.openapi.keymap.impl;
import com.intellij.ide.DataManager;
import com.intellij.ide.IdeEventQueue;
import com.intellij.openapi.actionSystem.ActionPlaces;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.ex.ActionManagerEx;
import com.intellij.openapi.keymap.KeymapManager;
import com.intellij.openapi.util.Clock;
import com.intellij.openapi.util.Couple;
import com.intellij.openapi.wm.IdeFocusManager;
import com.intellij.util.containers.ConcurrentHashMap;
import gnu.trove.TIntIntHashMap;
import gnu.trove.TIntIntProcedure;
import org.jetbrains.annotations.NotNull;
import java.awt.*;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
/**
* Support for keyboard shortcuts like Control-double-click or Control-double-click+A
*
* Timings that are used in the implementation to detect double click were tuned for SearchEverywhere
* functionality (invoked on double Shift), so if you need to change them, please make sure
* SearchEverywhere behaviour remains intact.
*/
public class ModifierKeyDoubleClickHandler {
private static final ModifierKeyDoubleClickHandler INSTANCE = new ModifierKeyDoubleClickHandler();
private final ConcurrentMap<String, IdeEventQueue.EventDispatcher> myDispatchers = new ConcurrentHashMap<String, IdeEventQueue.EventDispatcher>();
private ModifierKeyDoubleClickHandler() { }
public static ModifierKeyDoubleClickHandler getInstance() {
return INSTANCE;
}
/**
* @param actionId Id of action to be triggered on modifier+modifier[+actionKey]
* @param modifierKeyCode keyCode for modifier, e.g. KeyEvent.VK_SHIFT
* @param actionKeyCode keyCode for actionKey, or -1 if action should be triggered on bare modifier double click
*/
public void registerAction(@NotNull String actionId,
int modifierKeyCode,
int actionKeyCode) {
final MyDispatcher dispatcher = new MyDispatcher(actionId, modifierKeyCode, actionKeyCode);
IdeEventQueue.EventDispatcher oldDispatcher = myDispatchers.put(actionId, dispatcher);
IdeEventQueue.getInstance().addDispatcher(dispatcher, null);
if (oldDispatcher != null) {
IdeEventQueue.getInstance().removeDispatcher(oldDispatcher);
}
}
public void unregisterAction(@NotNull String actionId) {
IdeEventQueue.EventDispatcher oldDispatcher = myDispatchers.remove(actionId);
if (oldDispatcher != null) {
IdeEventQueue.getInstance().removeDispatcher(oldDispatcher);
}
}
private static class MyDispatcher implements IdeEventQueue.EventDispatcher {
private static final TIntIntHashMap KEY_CODE_TO_MODIFIER_MAP = new TIntIntHashMap();
static {
KEY_CODE_TO_MODIFIER_MAP.put(KeyEvent.VK_ALT, InputEvent.ALT_MASK);
KEY_CODE_TO_MODIFIER_MAP.put(KeyEvent.VK_CONTROL, InputEvent.CTRL_MASK);
KEY_CODE_TO_MODIFIER_MAP.put(KeyEvent.VK_META, InputEvent.META_MASK);
KEY_CODE_TO_MODIFIER_MAP.put(KeyEvent.VK_SHIFT, InputEvent.SHIFT_MASK);
}
private final String myActionId;
private final int myModifierKeyCode;
private final int myActionKeyCode;
private final Couple<AtomicBoolean> ourPressed = Couple.of(new AtomicBoolean(false), new AtomicBoolean(false));
private final Couple<AtomicBoolean> ourReleased = Couple.of(new AtomicBoolean(false), new AtomicBoolean(false));
private final AtomicBoolean ourOtherKeyWasPressed = new AtomicBoolean(false);
private final AtomicLong ourLastTimePressed = new AtomicLong(0);
public MyDispatcher(@NotNull String actionId, int modifierKeyCode, int actionKeyCode) {
myActionId = actionId;
myModifierKeyCode = modifierKeyCode;
myActionKeyCode = actionKeyCode;
}
@Override
public boolean dispatch(AWTEvent event) {
if (event instanceof KeyEvent) {
final KeyEvent keyEvent = (KeyEvent)event;
final int keyCode = keyEvent.getKeyCode();
if (keyCode == myModifierKeyCode) {
if (hasOtherModifiers(keyEvent)) {
resetState();
return false;
}
if (ourOtherKeyWasPressed.get() && Clock.getTime() - ourLastTimePressed.get() < 500) {
resetState();
return false;
}
ourOtherKeyWasPressed.set(false);
if (ourPressed.first.get() && Clock.getTime() - ourLastTimePressed.get() > 500) {
resetState();
}
handleModifier((KeyEvent)event);
return false;
} else if (ourPressed.first.get() && ourReleased.first.get() && ourPressed.second.get() && myActionKeyCode != -1) {
if (keyCode == myActionKeyCode) {
if (event.getID() == KeyEvent.KEY_PRESSED) {
run(keyEvent);
}
return true;
}
return false;
} else {
ourLastTimePressed.set(Clock.getTime());
ourOtherKeyWasPressed.set(true);
if (keyCode == KeyEvent.VK_ESCAPE || keyCode == KeyEvent.VK_TAB) {
ourLastTimePressed.set(0);
}
}
resetState();
}
return false;
}
private boolean hasOtherModifiers(KeyEvent keyEvent) {
final int modifiers = keyEvent.getModifiers();
return !KEY_CODE_TO_MODIFIER_MAP.forEachEntry(new TIntIntProcedure() {
@Override
public boolean execute(int keyCode, int modifierMask) {
return keyCode == myModifierKeyCode || (modifiers & modifierMask) == 0;
}
});
}
private void handleModifier(KeyEvent event) {
if (ourPressed.first.get() && Clock.getTime() - ourLastTimePressed.get() > 300) {
resetState();
return;
}
if (event.getID() == KeyEvent.KEY_PRESSED) {
if (!ourPressed.first.get()) {
resetState();
ourPressed.first.set(true);
ourLastTimePressed.set(Clock.getTime());
return;
} else {
if (ourPressed.first.get() && ourReleased.first.get()) {
ourPressed.second.set(true);
ourLastTimePressed.set(Clock.getTime());
return;
}
}
} else if (event.getID() == KeyEvent.KEY_RELEASED) {
if (ourPressed.first.get() && !ourReleased.first.get()) {
ourReleased.first.set(true);
ourLastTimePressed.set(Clock.getTime());
return;
} else if (ourPressed.first.get() && ourReleased.first.get() && ourPressed.second.get()) {
resetState();
if (myActionKeyCode == -1 && !isActionBound()) {
run(event);
}
return;
}
}
resetState();
}
private void resetState() {
ourPressed.first.set(false);
ourPressed.second.set(false);
ourReleased.first.set(false);
ourReleased.second.set(false);
}
private void run(KeyEvent event) {
final ActionManagerEx actionManager = ActionManagerEx.getInstanceEx();
final AnAction action = actionManager.getAction(myActionId);
final AnActionEvent anActionEvent = new AnActionEvent(event,
DataManager.getInstance().getDataContext(IdeFocusManager.findInstance().getFocusOwner()),
ActionPlaces.MAIN_MENU,
action.getTemplatePresentation(),
actionManager,
0);
actionManager.fireBeforeActionPerformed(action, anActionEvent.getDataContext(), anActionEvent);
action.actionPerformed(anActionEvent);
actionManager.fireAfterActionPerformed(action, anActionEvent.getDataContext(), anActionEvent);
}
private boolean isActionBound() {
return KeymapManager.getInstance().getActiveKeymap().getShortcuts(myActionId).length > 0;
}
}
}
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