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/*
* Copyright (C) 2013 DroidDriver committers
*
* 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.google.android.droiddriver.scroll;
import static com.google.android.droiddriver.scroll.Direction.PhysicalDirection.DOWN;
import static com.google.android.droiddriver.scroll.Direction.PhysicalDirection.LEFT;
import static com.google.android.droiddriver.scroll.Direction.PhysicalDirection.RIGHT;
import static com.google.android.droiddriver.scroll.Direction.PhysicalDirection.UP;
/**
* A namespace to hold interfaces and constants for scroll directions.
*/
public class Direction {
/** Logical directions */
public enum LogicalDirection {
FORWARD {
@Override
public LogicalDirection reverse() {
return BACKWARD;
}
},
BACKWARD {
@Override
public LogicalDirection reverse() {
return FORWARD;
}
};
public abstract LogicalDirection reverse();
}
/** Physical directions */
public enum PhysicalDirection {
UP {
@Override
public PhysicalDirection reverse() {
return DOWN;
}
@Override
public Axis axis() {
return Axis.VERTICAL;
}
},
DOWN {
@Override
public PhysicalDirection reverse() {
return UP;
}
@Override
public Axis axis() {
return Axis.VERTICAL;
}
},
LEFT {
@Override
public PhysicalDirection reverse() {
return RIGHT;
}
@Override
public Axis axis() {
return Axis.HORIZONTAL;
}
},
RIGHT {
@Override
public PhysicalDirection reverse() {
return LEFT;
}
@Override
public Axis axis() {
return Axis.HORIZONTAL;
}
};
public abstract PhysicalDirection reverse();
public abstract Axis axis();
}
public enum Axis {
HORIZONTAL {
private final PhysicalDirection[] directions = {LEFT, RIGHT};
@Override
public PhysicalDirection[] getPhysicalDirections() {
return directions;
}
},
VERTICAL {
private final PhysicalDirection[] directions = {UP, DOWN};
@Override
public PhysicalDirection[] getPhysicalDirections() {
return directions;
}
};
public abstract PhysicalDirection[] getPhysicalDirections();
}
/**
* Converts between PhysicalDirection and LogicalDirection. It's possible to
* override this for RTL (right-to-left) views, for example.
*/
public static abstract class DirectionConverter {
/** Follows standard convention: up-to-down, left-to-right */
public static final DirectionConverter STANDARD_CONVERTER = new DirectionConverter() {
@Override
public PhysicalDirection horizontalForwardDirection() {
return RIGHT;
}
@Override
public PhysicalDirection verticalForwardDirection() {
return DOWN;
}
};
/** Follows RTL convention: up-to-down, right-to-left */
public static final DirectionConverter RTL_CONVERTER = new DirectionConverter() {
@Override
public PhysicalDirection horizontalForwardDirection() {
return LEFT;
}
@Override
public PhysicalDirection verticalForwardDirection() {
return DOWN;
}
};
public abstract PhysicalDirection horizontalForwardDirection();
public abstract PhysicalDirection verticalForwardDirection();
public final PhysicalDirection horizontalBackwardDirection() {
return horizontalForwardDirection().reverse();
}
public final PhysicalDirection verticalBackwardDirection() {
return verticalForwardDirection().reverse();
}
/** Converts PhysicalDirection to LogicalDirection */
public final LogicalDirection toLogicalDirection(PhysicalDirection physicalDirection) {
LogicalDirection forward = LogicalDirection.FORWARD;
if (toPhysicalDirection(physicalDirection.axis(), forward) == physicalDirection) {
return forward;
}
return forward.reverse();
}
/** Converts LogicalDirection to PhysicalDirection */
public final PhysicalDirection toPhysicalDirection(Axis axis, LogicalDirection logicalDirection) {
switch (axis) {
case HORIZONTAL:
switch (logicalDirection) {
case BACKWARD:
return horizontalBackwardDirection();
case FORWARD:
return horizontalForwardDirection();
}
break;
case VERTICAL:
switch (logicalDirection) {
case BACKWARD:
return verticalBackwardDirection();
case FORWARD:
return verticalForwardDirection();
}
}
return null;
}
}
private Direction() {}
}
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