/*
* Copyright (C) 2011 Google Inc.
*
* 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.example.google.tv.leftnavbar;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ListView;
import java.util.ArrayList;
/**
* Extension of ListView which better handles focus.
*/
public class TabListView extends ListView {
private int mHighlighted;
private boolean mClearingFocus;
public TabListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* Sets the highlighted item which will receive focus whenever this list gains focus.
*/
public void setHighlighted(int index) {
mHighlighted = index;
}
@Override
public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
int selectedIndex = mHighlighted - getFirstVisiblePosition();
if (!hasFocus() &&
selectedIndex >= 0 && selectedIndex < getChildCount() &&
direction == FOCUS_LEFT) {
// This will force focus on the highlighted item.
setSelection(mHighlighted);
getChildAt(selectedIndex).addFocusables(views, direction, focusableMode);
} else {
super.addFocusables(views, direction, focusableMode);
}
}
@Override
public void clearFocus() {
mClearingFocus = true;
super.clearFocus();
mClearingFocus = false;
}
/**
* Whenever the geometry of the list changes, focus gets cleared. This is problematic when the
* list gets expanded. Instead of letting the focus go away, it simply gets reset slightly
* later.
*/
@Override
public void clearChildFocus(View child) {
if (mClearingFocus) {
super.clearChildFocus(child);
} else {
post(new Runnable() {
public void run() {
setSelection(mHighlighted);
}
});
}
}
/**
* Draws an extra divider at the top and bottom of the list.
*/
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
Drawable divider = getDivider();
if (divider == null) {
return;
}
Rect bounds = new Rect();
bounds.left = getPaddingLeft();
bounds.right = getRight() - getLeft() - getPaddingRight();
// Top.
bounds.top = getPaddingTop();
bounds.bottom = getPaddingTop() + getDividerHeight();
divider.setBounds(bounds);
divider.draw(canvas);
// Bottom.
bounds.top = getBottom() - getTop() - getPaddingBottom() - getDividerHeight();
bounds.bottom = getBottom() - getTop() - getPaddingBottom();
divider.setBounds(bounds);
divider.draw(canvas);
}
}