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/*
* Copyright (C) 2011 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.eclipse.adt.internal.editors.layout.gle2;
import com.android.ide.common.api.Margins;
import com.android.ide.common.api.Rect;
import com.android.ide.common.api.ResizePolicy;
import com.android.ide.eclipse.adt.internal.editors.layout.gle2.SelectionHandle.Position;
import com.android.ide.eclipse.adt.internal.editors.layout.gre.NodeProxy;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* The {@link SelectionHandles} of a {@link SelectionItem} are the set of
* {@link SelectionHandle} objects (possibly empty, for non-resizable objects) the user
* can manipulate to resize a widget.
*/
public class SelectionHandles implements Iterable<SelectionHandle> {
private final SelectionItem mItem;
private List<SelectionHandle> mHandles;
/**
* Constructs a new {@link SelectionHandles} object for the given {link
* {@link SelectionItem}
* @param item the item to create {@link SelectionHandles} for
*/
public SelectionHandles(SelectionItem item) {
mItem = item;
createHandles(item.getCanvas());
}
/**
* Find a specific {@link SelectionHandle} from this set of {@link SelectionHandles},
* which is within the given distance (in layout coordinates) from the center of the
* {@link SelectionHandle}.
*
* @param point the mouse position (in layout coordinates) to test
* @param distance the maximum distance from the handle center to accept
* @return a {@link SelectionHandle} under the point, or null if not found
*/
public SelectionHandle findHandle(LayoutPoint point, int distance) {
for (SelectionHandle handle : mHandles) {
if (handle.contains(point, distance)) {
return handle;
}
}
return null;
}
/**
* Create the {@link SelectionHandle} objects for the selection item, according to its
* {@link ResizePolicy}.
*/
private void createHandles(LayoutCanvas canvas) {
NodeProxy selectedNode = mItem.getNode();
Rect r = selectedNode.getBounds();
if (!r.isValid()) {
mHandles = Collections.emptyList();
return;
}
ResizePolicy resizability = mItem.getResizePolicy();
if (resizability.isResizable()) {
mHandles = new ArrayList<SelectionHandle>(8);
boolean left = resizability.leftAllowed();
boolean right = resizability.rightAllowed();
boolean top = resizability.topAllowed();
boolean bottom = resizability.bottomAllowed();
int x1 = r.x;
int y1 = r.y;
int w = r.w;
int h = r.h;
int x2 = x1 + w;
int y2 = y1 + h;
Margins insets = canvas.getInsets(mItem.getNode().getFqcn());
if (insets != null) {
x1 += insets.left;
x2 -= insets.right;
y1 += insets.top;
y2 -= insets.bottom;
}
int mx = (x1 + x2) / 2;
int my = (y1 + y2) / 2;
if (left) {
mHandles.add(new SelectionHandle(x1, my, Position.LEFT_MIDDLE));
if (top) {
mHandles.add(new SelectionHandle(x1, y1, Position.TOP_LEFT));
}
if (bottom) {
mHandles.add(new SelectionHandle(x1, y2, Position.BOTTOM_LEFT));
}
}
if (right) {
mHandles.add(new SelectionHandle(x2, my, Position.RIGHT_MIDDLE));
if (top) {
mHandles.add(new SelectionHandle(x2, y1, Position.TOP_RIGHT));
}
if (bottom) {
mHandles.add(new SelectionHandle(x2, y2, Position.BOTTOM_RIGHT));
}
}
if (top) {
mHandles.add(new SelectionHandle(mx, y1, Position.TOP_MIDDLE));
}
if (bottom) {
mHandles.add(new SelectionHandle(mx, y2, Position.BOTTOM_MIDDLE));
}
} else {
mHandles = Collections.emptyList();
}
}
// Implements Iterable<SelectionHandle>
@Override
public Iterator<SelectionHandle> iterator() {
return mHandles.iterator();
}
}
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