1 /* 2 * Copyright (C) 2010 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.common.layout; 18 19 import static com.android.ide.common.layout.LayoutConstants.ANDROID_URI; 20 import static com.android.ide.common.layout.LayoutConstants.ATTR_LAYOUT_GRAVITY; 21 import static com.android.ide.common.layout.LayoutConstants.ATTR_LAYOUT_HEIGHT; 22 import static com.android.ide.common.layout.LayoutConstants.ATTR_LAYOUT_WIDTH; 23 24 import com.android.ide.common.api.DrawingStyle; 25 import com.android.ide.common.api.DropFeedback; 26 import com.android.ide.common.api.IDragElement; 27 import com.android.ide.common.api.IFeedbackPainter; 28 import com.android.ide.common.api.IGraphics; 29 import com.android.ide.common.api.INode; 30 import com.android.ide.common.api.INodeHandler; 31 import com.android.ide.common.api.IViewMetadata; 32 import com.android.ide.common.api.IViewMetadata.FillPreference; 33 import com.android.ide.common.api.IViewRule; 34 import com.android.ide.common.api.InsertType; 35 import com.android.ide.common.api.Point; 36 import com.android.ide.common.api.Rect; 37 import com.android.ide.common.api.RuleAction; 38 import com.android.util.Pair; 39 40 import java.util.List; 41 import java.util.Map; 42 43 /** 44 * An {@link IViewRule} for android.widget.FrameLayout and all its derived 45 * classes. 46 */ 47 public class FrameLayoutRule extends BaseLayoutRule { 48 49 // ==== Drag'n'drop support ==== 50 // The FrameLayout accepts any drag'n'drop anywhere on its surface. 51 52 @Override 53 public DropFeedback onDropEnter(INode targetNode, Object targetView, 54 final IDragElement[] elements) { 55 if (elements.length == 0) { 56 return null; 57 } 58 59 return new DropFeedback(null, new IFeedbackPainter() { 60 public void paint(IGraphics gc, INode node, DropFeedback feedback) { 61 drawFeedback(gc, node, elements, feedback); 62 } 63 }); 64 } 65 66 protected void drawFeedback( 67 IGraphics gc, 68 INode targetNode, 69 IDragElement[] elements, 70 DropFeedback feedback) { 71 Rect b = targetNode.getBounds(); 72 if (!b.isValid()) { 73 return; 74 } 75 76 gc.useStyle(DrawingStyle.DROP_RECIPIENT); 77 gc.drawRect(b); 78 79 // Get the drop point 80 Point p = (Point) feedback.userData; 81 82 if (p == null) { 83 return; 84 } 85 86 Rect be = elements[0].getBounds(); 87 88 gc.useStyle(DrawingStyle.DROP_PREVIEW); 89 if (be.isValid()) { 90 // At least the first element has a bound. Draw rectangles 91 // for all dropped elements with valid bounds, offset at 92 // (0,0) 93 for (IDragElement it : elements) { 94 Rect currBounds = it.getBounds(); 95 if (currBounds.isValid()) { 96 int offsetX = b.x - currBounds.x; 97 int offsetY = b.y - currBounds.y; 98 drawElement(gc, it, offsetX, offsetY); 99 } 100 } 101 } else { 102 // We don't have bounds for new elements. In this case 103 // just draw insert lines indicating the top left corner where 104 // the item will be placed 105 106 // +1: Place lines fully within the view (the stroke width is 2) to 107 // make 108 // it even more visually obvious 109 gc.drawLine(b.x + 1, b.y, b.x + 1, b.y + b.h); 110 gc.drawLine(b.x, b.y + 1, b.x + b.w, b.y + 1); 111 } 112 } 113 114 @Override 115 public DropFeedback onDropMove(INode targetNode, IDragElement[] elements, 116 DropFeedback feedback, Point p) { 117 feedback.userData = p; 118 feedback.requestPaint = true; 119 return feedback; 120 } 121 122 @Override 123 public void onDropLeave(INode targetNode, IDragElement[] elements, DropFeedback feedback) { 124 // ignore 125 } 126 127 @Override 128 public void onDropped(final INode targetNode, final IDragElement[] elements, 129 final DropFeedback feedback, final Point p) { 130 Rect b = targetNode.getBounds(); 131 if (!b.isValid()) { 132 return; 133 } 134 135 // Collect IDs from dropped elements and remap them to new IDs 136 // if this is a copy or from a different canvas. 137 final Map<String, Pair<String, String>> idMap = getDropIdMap(targetNode, elements, 138 feedback.isCopy || !feedback.sameCanvas); 139 140 targetNode.editXml("Add elements to FrameLayout", new INodeHandler() { 141 142 public void handle(INode node) { 143 144 // Now write the new elements. 145 for (IDragElement element : elements) { 146 String fqcn = element.getFqcn(); 147 148 INode newChild = targetNode.appendChild(fqcn); 149 150 // Copy all the attributes, modifying them as needed. 151 addAttributes(newChild, element, idMap, DEFAULT_ATTR_FILTER); 152 153 addInnerElements(newChild, element, idMap); 154 } 155 } 156 }); 157 } 158 159 @Override 160 public void addLayoutActions(List<RuleAction> actions, final INode parentNode, 161 final List<? extends INode> children) { 162 super.addLayoutActions(actions, parentNode, children); 163 actions.add(RuleAction.createSeparator(25)); 164 actions.add(createMarginAction(parentNode, children)); 165 if (children != null && children.size() > 0) { 166 actions.add(createGravityAction(children, ATTR_LAYOUT_GRAVITY)); 167 } 168 } 169 170 @Override 171 public void onChildInserted(INode node, INode parent, InsertType insertType) { 172 // Look at the fill preferences and fill embedded layouts etc 173 String fqcn = node.getFqcn(); 174 IViewMetadata metadata = mRulesEngine.getMetadata(fqcn); 175 if (metadata != null) { 176 FillPreference fill = metadata.getFillPreference(); 177 String fillParent = getFillParentValueName(); 178 if (fill.fillHorizontally(true)) { 179 node.setAttribute(ANDROID_URI, ATTR_LAYOUT_WIDTH, fillParent); 180 } 181 if (fill.fillVertically(false)) { 182 node.setAttribute(ANDROID_URI, ATTR_LAYOUT_HEIGHT, fillParent); 183 } 184 } 185 } 186 } 187
