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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.graphics.Rect;
+
+import io.appium.droiddriver.DroidDriver;
+import io.appium.droiddriver.UiElement;
+import io.appium.droiddriver.finders.Finder;
+import io.appium.droiddriver.instrumentation.InstrumentationDriver;
+import io.appium.droiddriver.scroll.Direction.DirectionConverter;
+import io.appium.droiddriver.scroll.Direction.PhysicalDirection;
+
+/**
+ * Determines whether scrolling is possible by checking whether the last child
+ * in the logical scroll direction is fully visible. This assumes the count of
+ * children is static, and {@link UiElement#getChildren} includes all children
+ * no matter if it is visible. Currently {@link InstrumentationDriver} behaves
+ * this way.
+ * <p>
+ * This does not work if a child is larger than the physical size of the
+ * container.
+ */
+public class StaticSentinelStrategy extends SentinelStrategy {
+ /**
+ * Defaults to FIRST_CHILD_GETTER for backward scrolling, LAST_CHILD_GETTER
+ * for forward scrolling, and the standard {@link DirectionConverter}.
+ */
+ public static final StaticSentinelStrategy DEFAULT = new StaticSentinelStrategy(
+ FIRST_CHILD_GETTER, LAST_CHILD_GETTER, DirectionConverter.STANDARD_CONVERTER);
+
+ public StaticSentinelStrategy(Getter backwardGetter, Getter forwardGetter,
+ DirectionConverter directionConverter) {
+ super(backwardGetter, forwardGetter, directionConverter);
+ }
+
+ @Override
+ public boolean scroll(DroidDriver driver, Finder containerFinder, PhysicalDirection direction) {
+ UiElement sentinel = getSentinel(driver, containerFinder, direction);
+ UiElement container = sentinel.getParent();
+ // If the last child in the logical scroll direction is fully visible, no
+ // more scrolling is possible
+ Rect visibleBounds = container.getVisibleBounds();
+ if (visibleBounds.contains(sentinel.getBounds())) {
+ return false;
+ }
+
+ doScroll(container, direction);
+ return true;
+ }
+}