1 files changed, 96 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/ScrollViewRule.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/ScrollViewRule.java
new file mode 100644
index 000000000..9f2b4ae6f
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/ScrollViewRule.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2010 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;
+
+import static com.android.SdkConstants.ANDROID_URI;
+import static com.android.SdkConstants.ATTR_LAYOUT_HEIGHT;
+import static com.android.SdkConstants.ATTR_LAYOUT_WIDTH;
+import static com.android.SdkConstants.ATTR_ORIENTATION;
+import static com.android.SdkConstants.FQCN_LINEAR_LAYOUT;
+import static com.android.SdkConstants.VALUE_VERTICAL;
+
+import com.android.annotations.NonNull;
+import com.android.annotations.Nullable;
+import com.android.ide.common.api.DrawingStyle;
+import com.android.ide.common.api.DropFeedback;
+import com.android.ide.common.api.IDragElement;
+import com.android.ide.common.api.IGraphics;
+import com.android.ide.common.api.INode;
+import com.android.ide.common.api.IViewRule;
+import com.android.ide.common.api.InsertType;
+import com.android.ide.common.api.Point;
+import com.android.ide.common.api.Rect;
+
+/**
+ * An {@link IViewRule} for android.widget.ScrollView.
+ */
+public class ScrollViewRule extends FrameLayoutRule {
+
+    @Override
+    public void onChildInserted(@NonNull INode child, @NonNull INode parent,
+            @NonNull InsertType insertType) {
+        super.onChildInserted(child, parent, insertType);
+
+        // The child of the ScrollView should fill in both directions
+        String fillParent = getFillParentValueName();
+        child.setAttribute(ANDROID_URI, ATTR_LAYOUT_WIDTH, fillParent);
+        child.setAttribute(ANDROID_URI, ATTR_LAYOUT_HEIGHT, fillParent);
+    }
+
+    @Override
+    public void onCreate(@NonNull INode node, @NonNull INode parent,
+            @NonNull InsertType insertType) {
+        super.onCreate(node, parent, insertType);
+
+        if (insertType.isCreate()) {
+            // Insert a default linear layout (which will in turn be registered as
+            // a child of this node and the create child method above will set its
+            // fill parent attributes, its id, etc.
+            INode linear = node.appendChild(FQCN_LINEAR_LAYOUT);
+            linear.setAttribute(ANDROID_URI, ATTR_ORIENTATION, VALUE_VERTICAL);
+        }
+    }
+
+    @Override
+    public DropFeedback onDropMove(@NonNull INode targetNode, @NonNull IDragElement[] elements,
+            @Nullable DropFeedback feedback, @NonNull Point p) {
+        DropFeedback f = super.onDropMove(targetNode, elements, feedback, p);
+
+        // ScrollViews only allow a single child
+        if (targetNode.getChildren().length > 0) {
+            f.invalidTarget = true;
+        }
+        return f;
+    }
+
+    @Override
+    protected void drawFeedback(
+            IGraphics gc,
+            INode targetNode,
+            IDragElement[] elements,
+            DropFeedback feedback) {
+        if (targetNode.getChildren().length > 0) {
+            Rect b = targetNode.getBounds();
+            if (b.isValid()) {
+                gc.useStyle(DrawingStyle.DROP_RECIPIENT);
+                gc.drawRect(b);
+            }
+        } else {
+            super.drawFeedback(gc, targetNode, elements, feedback);
+        }
+    }
+}