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/*
* Copyright (c) 2013 Menny Even-Danan
*
* 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.anysoftkeyboard.utils;
import android.os.SystemClock;
import android.support.annotation.IntDef;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
public class ModifierKeyState {
@IntDef({INACTIVE, ACTIVE, LOCKED})
@Retention(RetentionPolicy.SOURCE)
public @interface LogicalState {}
@IntDef({RELEASING, PRESSING})
@Retention(RetentionPolicy.SOURCE)
public @interface PhysicalState {}
private static final int RELEASING = 0;
private static final int PRESSING = 1;
@PhysicalState
private int mPhysicalState = RELEASING;
private static final int INACTIVE = 0;
private static final int ACTIVE = 1;
private static final int LOCKED = 2;
@LogicalState
private int mLogicalState = INACTIVE;
private long mActiveStateStartTime = 0L;
private boolean mMomentaryPress = false;
private boolean mConsumed = false;
private final boolean mSupportsLockedState;
public ModifierKeyState(boolean supportsLockedState) {
mSupportsLockedState = supportsLockedState;
}
public void onPress() {
mPhysicalState = PRESSING;
mConsumed = false;
}
public void onOtherKeyPressed() {
if (mPhysicalState == PRESSING) {
mMomentaryPress = true;
} else if (mLogicalState == ACTIVE) {
mConsumed = true;
}
}
public boolean onOtherKeyReleased() {
if (mPhysicalState != PRESSING && mLogicalState == ACTIVE && mConsumed) {
//another key was pressed and release while this key was active:
//it means that this modifier key was consumed
mLogicalState = INACTIVE;
return true;
}
return false;
}
public void onRelease(final int doubleClickTime) {
mPhysicalState = RELEASING;
if (mMomentaryPress) {
mLogicalState = INACTIVE;
} else {
switch (mLogicalState) {
case INACTIVE:
mLogicalState = ACTIVE;
mActiveStateStartTime = SystemClock.elapsedRealtime();
mConsumed = false;
break;
case ACTIVE:
if (mSupportsLockedState && doubleClickTime > (SystemClock.elapsedRealtime() - mActiveStateStartTime)) {
mLogicalState = LOCKED;
} else {
mLogicalState = INACTIVE;
}
break;
case LOCKED:
mLogicalState = INACTIVE;
break;
}
}
mMomentaryPress = false;
}
public void reset() {
mPhysicalState = RELEASING;
mMomentaryPress = false;
mLogicalState = INACTIVE;
mActiveStateStartTime = 0L;
mConsumed = false;
}
public boolean isPressed() {
return mPhysicalState == PRESSING;
}
public boolean isActive() {
return mPhysicalState == PRESSING || mLogicalState != INACTIVE;
}
public boolean isLocked() {
return mPhysicalState != PRESSING && mLogicalState == LOCKED;
}
/**
* Sets the modifier state to active (or inactive) if possible.
* By possible, I mean, if it is LOCKED, it will stay locked.
*/
public void setActiveState(boolean active) {
if (mLogicalState == LOCKED) return;
mLogicalState = active ? ACTIVE : INACTIVE;
if (mLogicalState == ACTIVE) {
//setting the start time to zero, so LOCKED state will not
//be activated without actual user's double-clicking
mActiveStateStartTime = 0;
mConsumed = false;
}
}
public void toggleLocked() {
final boolean toUnLock = mLogicalState == LOCKED;
reset();
if (toUnLock) {
mLogicalState = INACTIVE;
} else {
mLogicalState = LOCKED;
}
}
}
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