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/*
* 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.MATCH_PARENT));
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);
}
}
}
}
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