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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.util.XmlUtils.ANDROID_URI;
import static com.android.ide.common.layout.LayoutConstants.ATTR_LAYOUT_GRAVITY;
import static com.android.ide.common.layout.LayoutConstants.ATTR_LAYOUT_HEIGHT;
import static com.android.ide.common.layout.LayoutConstants.ATTR_LAYOUT_WIDTH;
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.IFeedbackPainter;
import com.android.ide.common.api.IGraphics;
import com.android.ide.common.api.INode;
import com.android.ide.common.api.INodeHandler;
import com.android.ide.common.api.IViewMetadata;
import com.android.ide.common.api.IViewMetadata.FillPreference;
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;
import com.android.ide.common.api.RuleAction;
import com.android.util.Pair;
import java.util.List;
import java.util.Map;
/**
* An {@link IViewRule} for android.widget.FrameLayout and all its derived
* classes.
*/
public class FrameLayoutRule extends BaseLayoutRule {
// ==== Drag'n'drop support ====
// The FrameLayout accepts any drag'n'drop anywhere on its surface.
@Override
public DropFeedback onDropEnter(INode targetNode, Object targetView,
final IDragElement[] elements) {
if (elements.length == 0) {
return null;
}
return new DropFeedback(null, new IFeedbackPainter() {
@Override
public void paint(IGraphics gc, INode node, DropFeedback feedback) {
drawFeedback(gc, node, elements, feedback);
}
});
}
protected void drawFeedback(
IGraphics gc,
INode targetNode,
IDragElement[] elements,
DropFeedback feedback) {
Rect b = targetNode.getBounds();
if (!b.isValid()) {
return;
}
gc.useStyle(DrawingStyle.DROP_RECIPIENT);
gc.drawRect(b);
// Get the drop point
Point p = (Point) feedback.userData;
if (p == null) {
return;
}
Rect be = elements[0].getBounds();
gc.useStyle(DrawingStyle.DROP_PREVIEW);
if (be.isValid()) {
// At least the first element has a bound. Draw rectangles
// for all dropped elements with valid bounds, offset at
// (0,0)
for (IDragElement it : elements) {
Rect currBounds = it.getBounds();
if (currBounds.isValid()) {
int offsetX = b.x - currBounds.x;
int offsetY = b.y - currBounds.y;
drawElement(gc, it, offsetX, offsetY);
}
}
} else {
// We don't have bounds for new elements. In this case
// just draw insert lines indicating the top left corner where
// the item will be placed
// +1: Place lines fully within the view (the stroke width is 2) to
// make
// it even more visually obvious
gc.drawLine(b.x + 1, b.y, b.x + 1, b.y + b.h);
gc.drawLine(b.x, b.y + 1, b.x + b.w, b.y + 1);
}
}
@Override
public DropFeedback onDropMove(INode targetNode, IDragElement[] elements,
DropFeedback feedback, Point p) {
feedback.userData = p;
feedback.requestPaint = true;
return feedback;
}
@Override
public void onDropLeave(INode targetNode, IDragElement[] elements, DropFeedback feedback) {
// ignore
}
@Override
public void onDropped(final INode targetNode, final IDragElement[] elements,
final DropFeedback feedback, final Point p) {
Rect b = targetNode.getBounds();
if (!b.isValid()) {
return;
}
// Collect IDs from dropped elements and remap them to new IDs
// if this is a copy or from a different canvas.
final Map<String, Pair<String, String>> idMap = getDropIdMap(targetNode, elements,
feedback.isCopy || !feedback.sameCanvas);
targetNode.editXml("Add elements to FrameLayout", new INodeHandler() {
@Override
public void handle(INode node) {
// Now write the new elements.
for (IDragElement element : elements) {
String fqcn = element.getFqcn();
INode newChild = targetNode.appendChild(fqcn);
// Copy all the attributes, modifying them as needed.
addAttributes(newChild, element, idMap, DEFAULT_ATTR_FILTER);
addInnerElements(newChild, element, idMap);
}
}
});
}
@Override
public void addLayoutActions(List<RuleAction> actions, final INode parentNode,
final List<? extends INode> children) {
super.addLayoutActions(actions, parentNode, children);
actions.add(RuleAction.createSeparator(25));
actions.add(createMarginAction(parentNode, children));
if (children != null && children.size() > 0) {
actions.add(createGravityAction(children, ATTR_LAYOUT_GRAVITY));
}
}
@Override
public void onChildInserted(INode node, INode parent, InsertType insertType) {
// Look at the fill preferences and fill embedded layouts etc
String fqcn = node.getFqcn();
IViewMetadata metadata = mRulesEngine.getMetadata(fqcn);
if (metadata != null) {
FillPreference fill = metadata.getFillPreference();
String fillParent = getFillParentValueName();
if (fill.fillHorizontally(true)) {
node.setAttribute(ANDROID_URI, ATTR_LAYOUT_WIDTH, fillParent);
}
if (fill.fillVertically(false)) {
node.setAttribute(ANDROID_URI, ATTR_LAYOUT_HEIGHT, fillParent);
}
}
}
}
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