diff options
Diffstat (limited to 'eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java')
-rw-r--r-- | eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java new file mode 100644 index 000000000..6f3f0d0f7 --- /dev/null +++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java @@ -0,0 +1,100 @@ +/* + * 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.common.layout.relative; + +import static com.android.SdkConstants.ATTR_ID; +import static com.android.SdkConstants.VALUE_TRUE; + + +import com.android.SdkConstants; +import static com.android.SdkConstants.ANDROID_URI; +import com.android.ide.common.api.Segment; + +/** A match is a potential pairing of two segments with a given {@link ConstraintType}. */ +class Match { + /** the edge of the dragged node that is matched */ + public final Segment with; + + /** the "other" edge that the dragged edge is matched with */ + public final Segment edge; + + /** the signed distance between the matched edges */ + public final int delta; + + /** the type of constraint this is a match for */ + public final ConstraintType type; + + /** whether this {@link Match} results in a cycle */ + public boolean cycle; + + /** The associated {@link GuidelineHander} which performed the match */ + private final GuidelineHandler mHandler; + + /** + * Create a new match. + * + * @param handler the handler which performed the match + * @param edge the "other" edge that the dragged edge is matched with + * @param with the edge of the dragged node that is matched + * @param type the type of constraint this is a match for + * @param delta the signed distance between the matched edges + */ + public Match(GuidelineHandler handler, Segment edge, Segment with, + ConstraintType type, int delta) { + mHandler = handler; + + this.edge = edge; + this.with = with; + this.type = type; + this.delta = delta; + } + + /** + * Returns the XML constraint attribute value for this match + * + * @param generateId whether an id should be generated if one is missing + * @return the XML constraint attribute value for this match + */ + public String getConstraint(boolean generateId) { + if (type.targetParent) { + return type.name + '=' + VALUE_TRUE; + } else { + String id = edge.id; + if (id == null || id.length() == -1) { + if (!generateId) { + // Placeholder to display for the user during dragging + id = "<generated>"; + } else { + // Must generate an id on the fly! + // See if it's been set by a different constraint we've already applied + // to this same node + id = edge.node.getStringAttr(ANDROID_URI, ATTR_ID); + if (id == null || id.length() == 0) { + id = mHandler.getRulesEngine().getUniqueId(edge.node.getFqcn()); + edge.node.setAttribute(ANDROID_URI, ATTR_ID, id); + } + } + } + return type.name + '=' + id; + } + } + + @Override + public String toString() { + return "Match [type=" + type + ", delta=" + delta + ", edge=" + edge + + "]"; + } +} |