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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.app.UiAutomation;
import android.widget.ProgressBar;
import io.appium.droiddriver.DroidDriver;
import io.appium.droiddriver.finders.By;
import io.appium.droiddriver.finders.Finder;
import io.appium.droiddriver.scroll.Direction.Axis;
import io.appium.droiddriver.scroll.Direction.DirectionConverter;
import io.appium.droiddriver.scroll.Direction.PhysicalDirection;
/**
* Static utility classes and methods pertaining to {@link Scroller} instances.
*/
public class Scrollers {
/**
* Augments the delegate {@link ScrollStepStrategy} - after a successful
* scroll, waits until ProgressBar is gone.
*/
public static abstract class ProgressBarScrollStepStrategy extends ForwardingScrollStepStrategy {
@Override
public boolean scroll(DroidDriver driver, Finder containerFinder, PhysicalDirection direction) {
if (super.scroll(driver, containerFinder, direction)) {
driver.checkGone(By.className(ProgressBar.class));
return true;
}
return false;
}
/** Convenience method to wrap {@code delegate} with this class */
public static ScrollStepStrategy wrap(final ScrollStepStrategy delegate) {
return new ProgressBarScrollStepStrategy() {
@Override
protected ScrollStepStrategy delegate() {
return delegate;
}
};
}
}
/**
* Returns a new default Scroller that works in simple cases. In complex cases
* you may try a {@link StepBasedScroller} with a custom
* {@link ScrollStepStrategy}:
* <ul>
* <li>If the Scroller is used with InstrumentationDriver,
* StaticSentinelStrategy may work and it's the simplest.</li>
* <li>Otherwise, DynamicSentinelStrategy should work in all cases, including
* the case of dynamic list, which shows more items when scrolling beyond the
* end. On the other hand, it's complex and needs more configuration.</li>
* </ul>
* Note if a {@link StepBasedScroller} is returned, it is constructed with
* arguments that apply to typical cases. You may want to customize them for
* specific cases. For instance, {@code perScrollTimeoutMillis} can be 0L if
* there are no asynchronously updated views. To that extent, this method
* serves as an example of how to construct {@link Scroller}s rather than
* providing the "official" {@link Scroller}.
*/
public static Scroller newScroller(UiAutomation uiAutomation) {
if (uiAutomation != null) {
return new StepBasedScroller(100/* maxScrolls */, 1000L/* perScrollTimeoutMillis */,
Axis.VERTICAL, new AccessibilityEventScrollStepStrategy(uiAutomation, 1000L,
DirectionConverter.STANDARD_CONVERTER), true/* startFromBeginning */);
}
// TODO: A {@link Scroller} that directly jumps to the view if an
// InstrumentationDriver is used.
return new StepBasedScroller(100/* maxScrolls */, 1000L/* perScrollTimeoutMillis */,
Axis.VERTICAL, StaticSentinelStrategy.DEFAULT, true/* startFromBeginning */);
}
}
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