1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Eclipse Public License, Version 1.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.eclipse.org/org/documents/epl-v10.php 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.ide.eclipse.adt.internal.editors.layout.gle2; 18 19 import com.android.ide.common.api.Margins; 20 import com.android.ide.common.api.Rect; 21 import com.android.ide.common.api.ResizePolicy; 22 import com.android.ide.eclipse.adt.internal.editors.layout.gle2.SelectionHandle.Position; 23 import com.android.ide.eclipse.adt.internal.editors.layout.gre.NodeProxy; 24 25 import java.util.ArrayList; 26 import java.util.Collections; 27 import java.util.Iterator; 28 import java.util.List; 29 30 /** 31 * The {@link SelectionHandles} of a {@link SelectionItem} are the set of 32 * {@link SelectionHandle} objects (possibly empty, for non-resizable objects) the user 33 * can manipulate to resize a widget. 34 */ 35 public class SelectionHandles implements Iterable<SelectionHandle> { 36 private final SelectionItem mItem; 37 private List<SelectionHandle> mHandles; 38 39 /** 40 * Constructs a new {@link SelectionHandles} object for the given {link 41 * {@link SelectionItem} 42 * @param item the item to create {@link SelectionHandles} for 43 */ 44 public SelectionHandles(SelectionItem item) { 45 mItem = item; 46 47 createHandles(item.getCanvas()); 48 } 49 50 /** 51 * Find a specific {@link SelectionHandle} from this set of {@link SelectionHandles}, 52 * which is within the given distance (in layout coordinates) from the center of the 53 * {@link SelectionHandle}. 54 * 55 * @param point the mouse position (in layout coordinates) to test 56 * @param distance the maximum distance from the handle center to accept 57 * @return a {@link SelectionHandle} under the point, or null if not found 58 */ 59 public SelectionHandle findHandle(LayoutPoint point, int distance) { 60 for (SelectionHandle handle : mHandles) { 61 if (handle.contains(point, distance)) { 62 return handle; 63 } 64 } 65 66 return null; 67 } 68 69 /** 70 * Create the {@link SelectionHandle} objects for the selection item, according to its 71 * {@link ResizePolicy}. 72 */ 73 private void createHandles(LayoutCanvas canvas) { 74 NodeProxy selectedNode = mItem.getNode(); 75 Rect r = selectedNode.getBounds(); 76 if (!r.isValid()) { 77 mHandles = Collections.emptyList(); 78 return; 79 } 80 81 ResizePolicy resizability = mItem.getResizePolicy(); 82 if (resizability.isResizable()) { 83 mHandles = new ArrayList<SelectionHandle>(8); 84 boolean left = resizability.leftAllowed(); 85 boolean right = resizability.rightAllowed(); 86 boolean top = resizability.topAllowed(); 87 boolean bottom = resizability.bottomAllowed(); 88 int x1 = r.x; 89 int y1 = r.y; 90 int w = r.w; 91 int h = r.h; 92 int x2 = x1 + w; 93 int y2 = y1 + h; 94 95 Margins insets = canvas.getInsets(mItem.getNode().getFqcn()); 96 if (insets != null) { 97 x1 += insets.left; 98 x2 -= insets.right; 99 y1 += insets.top; 100 y2 -= insets.bottom; 101 } 102 103 int mx = (x1 + x2) / 2; 104 int my = (y1 + y2) / 2; 105 106 if (left) { 107 mHandles.add(new SelectionHandle(x1, my, Position.LEFT_MIDDLE)); 108 if (top) { 109 mHandles.add(new SelectionHandle(x1, y1, Position.TOP_LEFT)); 110 } 111 if (bottom) { 112 mHandles.add(new SelectionHandle(x1, y2, Position.BOTTOM_LEFT)); 113 } 114 } 115 if (right) { 116 mHandles.add(new SelectionHandle(x2, my, Position.RIGHT_MIDDLE)); 117 if (top) { 118 mHandles.add(new SelectionHandle(x2, y1, Position.TOP_RIGHT)); 119 } 120 if (bottom) { 121 mHandles.add(new SelectionHandle(x2, y2, Position.BOTTOM_RIGHT)); 122 } 123 } 124 if (top) { 125 mHandles.add(new SelectionHandle(mx, y1, Position.TOP_MIDDLE)); 126 } 127 if (bottom) { 128 mHandles.add(new SelectionHandle(mx, y2, Position.BOTTOM_MIDDLE)); 129 } 130 } else { 131 mHandles = Collections.emptyList(); 132 } 133 } 134 135 // Implements Iterable<SelectionHandle> 136 @Override 137 public Iterator<SelectionHandle> iterator() { 138 return mHandles.iterator(); 139 } 140 } 141
