1 files changed, 136 insertions, 0 deletions
diff --git a/src/com/android/browser/TabScrollView.java b/src/com/android/browser/TabScrollView.java
new file mode 100644
index 0000000..6d8b91b
--- /dev/null
+++ b/src/com/android/browser/TabScrollView.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.browser;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.HorizontalScrollView;
+import android.widget.LinearLayout;
+
+/**
+ * custom view for displaying tabs in the tabbed title bar
+ */
+public class TabScrollView extends HorizontalScrollView {
+
+    private Context mContext;
+
+    private LinearLayout mContentView;
+
+    private int mSelected;
+
+    /**
+     * @param context
+     * @param attrs
+     * @param defStyle
+     */
+    public TabScrollView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context);
+    }
+
+    /**
+     * @param context
+     * @param attrs
+     */
+    public TabScrollView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    /**
+     * @param context
+     */
+    public TabScrollView(Context context) {
+        super(context);
+        init(context);
+    }
+
+    private void init(Context ctx) {
+        mContext = ctx;
+        setHorizontalScrollBarEnabled(false);
+        mContentView = new LinearLayout(mContext);
+        mContentView.setOrientation(LinearLayout.HORIZONTAL);
+        mContentView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
+                LayoutParams.WRAP_CONTENT));
+        addView(mContentView);
+        mSelected = -1;
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        super.onLayout(changed, left, top, right, bottom);
+        ensureChildVisible(getSelectedTab());
+    }
+
+    void setSelectedTab(int position) {
+        View v = getSelectedTab();
+        if (v != null) {
+            v.setSelected(false);
+        }
+        mSelected = position;
+        v = getSelectedTab();
+        if (v != null) {
+            v.setSelected(true);
+        }
+        requestLayout();
+    }
+
+    View getSelectedTab() {
+        if ((mSelected >= 0) && (mSelected < mContentView.getChildCount())) {
+            return mContentView.getChildAt(mSelected);
+        } else {
+            return null;
+        }
+    }
+
+    void clearTabs() {
+        mContentView.removeAllViews();
+    }
+
+    void addTab(View tab) {
+        mContentView.addView(tab);
+        tab.setSelected(false);
+    }
+
+    void addTab(View tab, int pos) {
+        mContentView.addView(tab, pos);
+        tab.setSelected(false);
+    }
+
+    void removeTab(View tab) {
+        mContentView.removeView(tab);
+    }
+
+    void ensureChildVisible(View child) {
+        if (child != null) {
+            int childl = child.getLeft();
+            int childr = childl + child.getWidth();
+            int viewl = getScrollX();
+            int viewr = viewl + getWidth();
+            if (childl < viewl) {
+                // need scrolling to left
+                scrollTo(childl, 0);
+            } else if (childr > viewr) {
+                // need scrolling to right
+                scrollTo(childr - viewr + viewl, 0);
+            }
+        }
+    }
+
+
+}