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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.ide.common.layout;
import static com.android.SdkConstants.ANDROID_URI;
import static com.android.SdkConstants.ATTR_LAYOUT_HEIGHT;
import static com.android.SdkConstants.ATTR_LAYOUT_WIDTH;
import static com.android.SdkConstants.ATTR_ORIENTATION;
import static com.android.SdkConstants.FQCN_LINEAR_LAYOUT;
import static com.android.SdkConstants.VALUE_HORIZONTAL;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
import com.android.ide.common.api.DrawingStyle;
import com.android.ide.common.api.DropFeedback;
import com.android.ide.common.api.IDragElement;
import com.android.ide.common.api.IGraphics;
import com.android.ide.common.api.INode;
import com.android.ide.common.api.IViewRule;
import com.android.ide.common.api.InsertType;
import com.android.ide.common.api.Point;
import com.android.ide.common.api.Rect;
/**
* An {@link IViewRule} for android.widget.HorizontalScrollView.
*/
public class HorizontalScrollViewRule extends FrameLayoutRule {
@Override
public void onChildInserted(@NonNull INode child, @NonNull INode parent,
@NonNull InsertType insertType) {
super.onChildInserted(child, parent, insertType);
// The child of the ScrollView should fill in both directions
String fillParent = getFillParentValueName();
child.setAttribute(ANDROID_URI, ATTR_LAYOUT_WIDTH, fillParent);
child.setAttribute(ANDROID_URI, ATTR_LAYOUT_HEIGHT, fillParent);
}
@Override
public void onCreate(@NonNull INode node, @NonNull INode parent,
@NonNull InsertType insertType) {
super.onCreate(node, parent, insertType);
if (insertType.isCreate()) {
// Insert a horizontal linear layout which is commonly used with horizontal scrollbars
// as described by the documentation for HorizontalScrollbars.
INode linearLayout = node.appendChild(FQCN_LINEAR_LAYOUT);
linearLayout.setAttribute(ANDROID_URI, ATTR_ORIENTATION,
VALUE_HORIZONTAL);
}
}
@Override
public DropFeedback onDropMove(@NonNull INode targetNode, @NonNull IDragElement[] elements,
@Nullable DropFeedback feedback, @NonNull Point p) {
DropFeedback f = super.onDropMove(targetNode, elements, feedback, p);
// HorizontalScrollViews only allow a single child
if (targetNode.getChildren().length > 0) {
f.invalidTarget = true;
}
return f;
}
@Override
protected void drawFeedback(
IGraphics gc,
INode targetNode,
IDragElement[] elements,
DropFeedback feedback) {
if (targetNode.getChildren().length > 0) {
Rect b = targetNode.getBounds();
if (b.isValid()) {
gc.useStyle(DrawingStyle.DROP_RECIPIENT);
gc.drawRect(b);
}
} else {
super.drawFeedback(gc, targetNode, elements, feedback);
}
}
}
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