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 package com.android.ide.common.layout; 17 18 import static com.android.ide.common.layout.LayoutConstants.ANDROID_URI; 19 import static com.android.ide.common.layout.LayoutConstants.ATTR_LAYOUT_GRAVITY; 20 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_BOTTOM; 21 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_CENTER; 22 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_CENTER_HORIZONTAL; 23 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_CENTER_VERTICAL; 24 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_FILL; 25 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_FILL_HORIZONTAL; 26 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_FILL_VERTICAL; 27 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_LEFT; 28 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_RIGHT; 29 import static com.android.ide.common.layout.LayoutConstants.GRAVITY_VALUE_TOP; 30 31 import org.w3c.dom.Element; 32 33 /** Helper class for looking up the gravity masks of gravity attributes */ 34 public class GravityHelper { 35 public static final int GRAVITY_LEFT = 1 << 0; 36 public static final int GRAVITY_RIGHT = 1 << 1; 37 public static final int GRAVITY_CENTER_HORIZ = 1 << 2; 38 public static final int GRAVITY_FILL_HORIZ = 1 << 3; 39 public static final int GRAVITY_CENTER_VERT = 1 << 4; 40 public static final int GRAVITY_FILL_VERT = 1 << 5; 41 public static final int GRAVITY_TOP = 1 << 6; 42 public static final int GRAVITY_BOTTOM = 1 << 7; 43 public static final int GRAVITY_HORIZ_MASK = GRAVITY_CENTER_HORIZ | GRAVITY_FILL_HORIZ 44 | GRAVITY_LEFT | GRAVITY_RIGHT; 45 public static final int GRAVITY_VERT_MASK = GRAVITY_CENTER_VERT | GRAVITY_FILL_VERT 46 | GRAVITY_TOP | GRAVITY_BOTTOM; 47 48 /** 49 * Returns the gravity of the given element 50 * 51 * @param element the element to look up the gravity for 52 * @return a bit mask corresponding to the selected gravities 53 */ getGravity(Element element)54 public static int getGravity(Element element) { 55 String gravityString = element.getAttributeNS(ANDROID_URI, ATTR_LAYOUT_GRAVITY); 56 return getGravity(gravityString, GRAVITY_LEFT | GRAVITY_TOP); 57 } 58 59 /** 60 * Returns the gravity bitmask for the given gravity string description 61 * 62 * @param gravityString the gravity string description 63 * @param defaultMask the default/initial bitmask to start with 64 * @return a bitmask corresponding to the gravity description 65 */ getGravity(String gravityString, int defaultMask)66 public static int getGravity(String gravityString, int defaultMask) { 67 int gravity = defaultMask; 68 if (gravityString != null && gravityString.length() > 0) { 69 String[] anchors = gravityString.split("\\|"); //$NON-NLS-1$ 70 for (String anchor : anchors) { 71 if (GRAVITY_VALUE_CENTER.equals(anchor)) { 72 gravity = GRAVITY_CENTER_HORIZ | GRAVITY_CENTER_VERT; 73 } else if (GRAVITY_VALUE_FILL.equals(anchor)) { 74 gravity = GRAVITY_FILL_HORIZ | GRAVITY_FILL_VERT; 75 } else if (GRAVITY_VALUE_CENTER_VERTICAL.equals(anchor)) { 76 gravity = (gravity & GRAVITY_HORIZ_MASK) | GRAVITY_CENTER_VERT; 77 } else if (GRAVITY_VALUE_CENTER_HORIZONTAL.equals(anchor)) { 78 gravity = (gravity & GRAVITY_VERT_MASK) | GRAVITY_CENTER_HORIZ; 79 } else if (GRAVITY_VALUE_FILL_VERTICAL.equals(anchor)) { 80 gravity = (gravity & GRAVITY_HORIZ_MASK) | GRAVITY_FILL_VERT; 81 } else if (GRAVITY_VALUE_FILL_HORIZONTAL.equals(anchor)) { 82 gravity = (gravity & GRAVITY_VERT_MASK) | GRAVITY_FILL_HORIZ; 83 } else if (GRAVITY_VALUE_TOP.equals(anchor)) { 84 gravity = (gravity & GRAVITY_HORIZ_MASK) | GRAVITY_TOP; 85 } else if (GRAVITY_VALUE_BOTTOM.equals(anchor)) { 86 gravity = (gravity & GRAVITY_HORIZ_MASK) | GRAVITY_BOTTOM; 87 } else if (GRAVITY_VALUE_LEFT.equals(anchor)) { 88 gravity = (gravity & GRAVITY_VERT_MASK) | GRAVITY_LEFT; 89 } else if (GRAVITY_VALUE_RIGHT.equals(anchor)) { 90 gravity = (gravity & GRAVITY_VERT_MASK) | GRAVITY_RIGHT; 91 } else { 92 // "clip" not supported 93 } 94 } 95 } 96 97 return gravity; 98 } 99 } 100