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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.home;
import android.support.v4.content.ContextCompat;
import org.mozilla.gecko.R;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.accessibility.AccessibilityEvent;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;
/**
* {@code TabMenuStrip} is the view used to display {@code HomePager} tabs
* on tablets. See {@code TabMenuStripLayout} for details about how the
* tabs are created and updated.
*/
public class TabMenuStrip extends HorizontalScrollView
implements HomePager.Decor {
// Offset between the selected tab title and the edge of the screen,
// except for the first and last tab in the tab strip.
private static final int TITLE_OFFSET_DIPS = 24;
private final int titleOffset;
private final TabMenuStripLayout layout;
private final Paint shadowPaint;
private final int shadowSize;
public interface OnTitleClickListener {
void onTitleClicked(int index);
}
public TabMenuStrip(Context context, AttributeSet attrs) {
super(context, attrs);
// Disable the scroll bar.
setHorizontalScrollBarEnabled(false);
setFillViewport(true);
final Resources res = getResources();
titleOffset = (int) (TITLE_OFFSET_DIPS * res.getDisplayMetrics().density);
layout = new TabMenuStripLayout(context, attrs);
addView(layout, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
shadowSize = res.getDimensionPixelSize(R.dimen.tabs_strip_shadow_size);
shadowPaint = new Paint();
shadowPaint.setColor(ContextCompat.getColor(context, R.color.url_bar_shadow));
shadowPaint.setStrokeWidth(0.0f);
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
final int height = getHeight();
canvas.drawRect(0, height - shadowSize, layout.getWidth(), height, shadowPaint);
}
@Override
public void onAddPagerView(String title) {
layout.onAddPagerView(title);
}
@Override
public void removeAllPagerViews() {
layout.removeAllViews();
}
@Override
public void onPageSelected(final int position) {
layout.onPageSelected(position);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
layout.onPageScrolled(position, positionOffset, positionOffsetPixels);
final View selectedTitle = layout.getChildAt(position);
if (selectedTitle == null) {
return;
}
final int selectedTitleOffset = (int) (positionOffset * selectedTitle.getWidth());
int titleLeft = selectedTitle.getLeft() + selectedTitleOffset;
if (position > 0) {
titleLeft -= titleOffset;
}
int titleRight = selectedTitle.getRight() + selectedTitleOffset;
if (position < layout.getChildCount() - 1) {
titleRight += titleOffset;
}
final int scrollX = getScrollX();
if (titleLeft < scrollX) {
// Tab strip overflows to the left.
scrollTo(titleLeft, 0);
} else if (titleRight > scrollX + getWidth()) {
// Tab strip overflows to the right.
scrollTo(titleRight - getWidth(), 0);
}
}
@Override
public void setOnTitleClickListener(OnTitleClickListener onTitleClickListener) {
layout.setOnTitleClickListener(onTitleClickListener);
}
}
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