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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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.android.tools.idea.uibuilder.handlers;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import com.android.tools.idea.common.api.InsertType;
import com.android.tools.idea.common.command.NlWriteCommandActionUtil;
import com.android.tools.idea.uibuilder.api.ScrollHandler;
import com.android.tools.idea.uibuilder.api.ScrollViewScrollHandler;
import com.android.tools.idea.uibuilder.api.ViewEditor;
import com.android.tools.idea.common.model.NlComponent;
import com.google.common.collect.ImmutableList;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Arrays;
import java.util.List;
import static com.android.SdkConstants.*;
public class NestedScrollViewHandler extends ScrollViewHandler {
@Override
@NotNull
public List<String> getInspectorProperties() {
return ImmutableList.of(
ATTR_CONTEXT,
ATTR_SHOW_IN,
ATTR_FILL_VIEWPORT,
ATTR_CLIP_TO_PADDING);
}
@Override
public boolean onCreate(@Nullable NlComponent parent,
@NotNull NlComponent newChild,
@NotNull InsertType type) {
if (!super.onCreate(parent, newChild, type)) {
return false;
}
if (type.isCreate()) {
NlWriteCommandActionUtil.run(newChild, "Setting fill_viewport", () -> {
newChild.setAndroidAttribute(ATTR_FILL_VIEWPORT, "true");
});
}
return true;
}
@Nullable
@Override
public ScrollHandler createScrollHandler(@NotNull ViewEditor editor, @NotNull NlComponent component) {
ViewGroup viewGroup = ScrollViewHandler.getViewGroupFromComponent(component);
if (viewGroup == null) {
return null;
}
// NestedScrollView is a NestedScrollingChild so if the parent is an instance of NestedScrollingParent,
// then delegate the scrolling to it.
ViewParent parent = viewGroup.getParent();
if (parent instanceof ViewGroup) {
boolean nestedScrollingParent = Arrays.stream(parent.getClass().getInterfaces())
.map(Class::getName)
.anyMatch("android.support.v4.view.NestedScrollingParent"::equals);
if (nestedScrollingParent) {
viewGroup = (ViewGroup)parent;
}
}
int maxScrollableHeight = ScrollViewScrollHandler.getMaxScrollable(viewGroup, ViewGroup::getHeight, View::getMeasuredHeight);
if (maxScrollableHeight > 0) {
// There is something to scroll
return ScrollViewScrollHandler
.createHandler(viewGroup, maxScrollableHeight, 10,
ScrollViewScrollHandler.Orientation.VERTICAL);
}
return null;
}
}
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