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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 io.appium.droiddriver.scroll;
import android.util.Log;
import java.util.List;
import io.appium.droiddriver.DroidDriver;
import io.appium.droiddriver.UiElement;
import io.appium.droiddriver.exceptions.ElementNotFoundException;
import io.appium.droiddriver.finders.By;
import io.appium.droiddriver.finders.Finder;
import io.appium.droiddriver.finders.Predicate;
import io.appium.droiddriver.finders.Predicates;
import io.appium.droiddriver.scroll.Direction.DirectionConverter;
import io.appium.droiddriver.scroll.Direction.LogicalDirection;
import io.appium.droiddriver.scroll.Direction.PhysicalDirection;
import io.appium.droiddriver.util.Logs;
/**
* A {@link ScrollStepStrategy} that determines whether scrolling is possible
* based on a sentinel.
*/
public abstract class SentinelStrategy implements ScrollStepStrategy {
/**
* A {@link Finder} for sentinel. Note that unlike {@link Finder}, invisible
* UiElements are not skipped by default.
*/
public static abstract class Getter implements Finder {
protected final Predicate<? super UiElement> predicate;
protected Getter() {
// Include invisible children by default.
this(null);
}
protected Getter(Predicate<? super UiElement> predicate) {
this.predicate = predicate;
}
/**
* Gets the sentinel, which must be an immediate child of {@code container}
* - not a descendant. Note sentinel may not exist if {@code container} has
* not finished updating.
*/
@Override
public UiElement find(UiElement container) {
UiElement sentinel = getSentinel(container.getChildren(predicate));
if (sentinel == null) {
throw new ElementNotFoundException(this);
}
Logs.log(Log.INFO, "Found sentinel: " + sentinel);
return sentinel;
}
protected abstract UiElement getSentinel(List<? extends UiElement> children);
@Override
public abstract String toString();
}
/**
* Returns the first child as the sentinel.
*/
public static final Getter FIRST_CHILD_GETTER = new Getter() {
@Override
protected UiElement getSentinel(List<? extends UiElement> children) {
return children.isEmpty() ? null : children.get(0);
}
@Override
public String toString() {
return "FIRST_CHILD";
}
};
/**
* Returns the last child as the sentinel.
*/
public static final Getter LAST_CHILD_GETTER = new Getter() {
@Override
protected UiElement getSentinel(List<? extends UiElement> children) {
return children.isEmpty() ? null : children.get(children.size() - 1);
}
@Override
public String toString() {
return "LAST_CHILD";
}
};
/**
* Returns the second last child as the sentinel. Useful when the activity
* always shows the last child as an anchor (for example a footer).
* <p>
* Sometimes uiautomatorviewer may not show the anchor as the last child, due
* to the reordering by layout described in {@link UiElement#getChildren}.
* This is not a problem with UiAutomationDriver because it sees the same as
* uiautomatorviewer does, but could be a problem with InstrumentationDriver.
* </p>
*/
public static final Getter SECOND_LAST_CHILD_GETTER = new Getter() {
@Override
protected UiElement getSentinel(List<? extends UiElement> children) {
return children.size() < 2 ? null : children.get(children.size() - 2);
}
@Override
public String toString() {
return "SECOND_LAST_CHILD";
}
};
/**
* Returns the second child as the sentinel. Useful when the activity shows a
* fixed first child.
*/
public static final Getter SECOND_CHILD_GETTER = new Getter() {
@Override
protected UiElement getSentinel(List<? extends UiElement> children) {
return children.size() <= 1 ? null : children.get(1);
}
@Override
public String toString() {
return "SECOND_CHILD";
}
};
/**
* Decorates a {@link Getter} by adding another {@link Predicate}.
*/
public static class MorePredicateGetter extends Getter {
private final Getter original;
public MorePredicateGetter(Getter original, Predicate<? super UiElement> extraPredicate) {
super(Predicates.allOf(original.predicate, extraPredicate));
this.original = original;
}
@Override
protected UiElement getSentinel(List<? extends UiElement> children) {
return original.getSentinel(children);
}
@Override
public String toString() {
return predicate.toString() + " " + original;
}
}
private final Getter backwardGetter;
private final Getter forwardGetter;
private final DirectionConverter directionConverter;
protected SentinelStrategy(Getter backwardGetter, Getter forwardGetter,
DirectionConverter directionConverter) {
this.backwardGetter = backwardGetter;
this.forwardGetter = forwardGetter;
this.directionConverter = directionConverter;
}
protected UiElement getSentinel(DroidDriver driver, Finder containerFinder,
PhysicalDirection direction) {
Logs.call(this, "getSentinel", driver, containerFinder, direction);
Finder sentinelFinder;
LogicalDirection logicalDirection = directionConverter.toLogicalDirection(direction);
if (logicalDirection == LogicalDirection.BACKWARD) {
sentinelFinder = By.chain(containerFinder, backwardGetter);
} else {
sentinelFinder = By.chain(containerFinder, forwardGetter);
}
return driver.on(sentinelFinder);
}
@Override
public final DirectionConverter getDirectionConverter() {
return directionConverter;
}
@Override
public void beginScrolling(DroidDriver driver, Finder containerFinder, Finder itemFinder,
PhysicalDirection direction) {}
@Override
public void endScrolling(DroidDriver driver, Finder containerFinder, Finder itemFinder,
PhysicalDirection direction) {}
@Override
public String toString() {
return String.format("{backwardGetter=%s, forwardGetter=%s}", backwardGetter, forwardGetter);
}
@Override
public void doScroll(UiElement container, PhysicalDirection direction) {
container.scroll(direction);
}
}
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