Java tutorial
/** * Wire * Copyright (C) 2016 Wire Swiss GmbH * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.waz.zclient.ui.views.tab; import android.content.Context; import android.content.res.ColorStateList; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.TextView; import com.waz.zclient.ui.R; import com.waz.zclient.ui.text.GlyphTextView; import com.waz.zclient.utils.ViewUtils; import java.util.ArrayList; import java.util.List; public class TabIndicatorLayout extends LinearLayout implements ViewPager.OnPageChangeListener { private int selectedPosition; private LinearLayout textViewContainer; private int[] anchorPositions; private TabIndicatorView tabIndicatorView; private Callback callback; private ViewPager viewPager; private int anchorWidth; public TabIndicatorLayout(Context context) { this(context, null); } public TabIndicatorLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public TabIndicatorLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); setOrientation(LinearLayout.VERTICAL); selectedPosition = 0; textViewContainer = new LinearLayout(getContext()); tabIndicatorView = new TabIndicatorView(context); addView(textViewContainer); LinearLayout.LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, getResources().getDimensionPixelSize(R.dimen.sign_tab_indicator_marker__height)); params.topMargin = getResources().getDimensionPixelSize(R.dimen.wire__padding__small); addView(tabIndicatorView, params); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); int numAnchorPositions = anchorPositions.length; anchorWidth = 0; if (numAnchorPositions > 0) { anchorWidth = w / numAnchorPositions; } int ap = anchorWidth / 2; for (int i = 0; i < numAnchorPositions; i++) { anchorPositions[i] = ap; ap += anchorWidth; } tabIndicatorView.setPosition(anchorPositions[selectedPosition], false); } public void setLabels(int[] resIds) { List<String> labels = new ArrayList<>(); for (int resId : resIds) { labels.add(getResources().getString(resId)); } setLabels(labels); } public void setGlyphLabels(int[] resIds) { List<String> labels = new ArrayList<>(); for (int resId : resIds) { labels.add(getResources().getString(resId)); } setGlyphLabels(labels); } public void setLabelHeight(int height) { ViewGroup.LayoutParams params = textViewContainer.getLayoutParams(); params.height = height; ViewUtils.setPaddingBottom(textViewContainer, getResources().getDimensionPixelSize(R.dimen.wire__divider__height)); textViewContainer.setLayoutParams(params); textViewContainer.invalidate(); } public void setLabels(List<String> lables) { anchorPositions = new int[lables.size()]; textViewContainer.removeAllViews(); for (int i = 0; i < lables.size(); i++) { String label = lables.get(i); LayoutInflater inflater = LayoutInflater.from(getContext()); TextView textView = (TextView) inflater.inflate(R.layout.tab_textview, textViewContainer, false); textViewContainer.addView(textView); textView.setText(label); textView.setId(i); } requestLayout(); } public void setGlyphLabels(List<String> lables) { anchorPositions = new int[lables.size()]; textViewContainer.removeAllViews(); for (int i = 0; i < lables.size(); i++) { String label = lables.get(i); LayoutInflater inflater = LayoutInflater.from(getContext()); GlyphTextView textView = (GlyphTextView) inflater.inflate(R.layout.tab_glyphtextview, textViewContainer, false); textViewContainer.addView(textView); textView.setText(label); textView.setId(i); } requestLayout(); } public void setTextColor(ColorStateList textColor) { if (textViewContainer == null) { return; } for (int i = 0; i < textViewContainer.getChildCount(); i++) { View view = textViewContainer.getChildAt(i); if (view instanceof TextView) { ((TextView) view).setTextColor(textColor); } } } public void setPrimaryColor(int color) { tabIndicatorView.setColor(color); } public void setShowDivider(boolean show) { tabIndicatorView.setShowDivider(show); } public void setViewPager(ViewPager viewPager) { if (this.viewPager != null) { this.viewPager.removeOnPageChangeListener(this); } this.viewPager = viewPager; this.viewPager.addOnPageChangeListener(this); PagerAdapter adapter = this.viewPager.getAdapter(); int count = adapter.getCount(); List<String> labels = new ArrayList<>(); for (int i = 0; i < count; i++) { labels.add(adapter.getPageTitle(i).toString()); } setLabels(labels); setSelected(viewPager.getCurrentItem()); } public void setCallback(Callback callback) { this.callback = callback; } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { // anchorWidth * (position + 0.5f) points exactly to the middle of the anchor range // positionOffset * anchorWidth is the offset caused by the pager slide between the anchor positions tabIndicatorView.setPosition((int) (anchorWidth * (position + positionOffset + 0.5f)), false); } @Override public void onPageSelected(int position) { setSelected(position); } @Override public void onPageScrollStateChanged(int state) { } public void setSelected(int pos) { selectedPosition = pos; tabIndicatorView.setPosition(anchorPositions[pos], true); for (int i = 0; i < textViewContainer.getChildCount(); i++) { textViewContainer.getChildAt(i).setSelected(i == selectedPosition); } } @Override public boolean onInterceptTouchEvent(MotionEvent event) { return true; } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_UP) { int pos = (int) (anchorPositions.length * event.getX() / getMeasuredWidth()); if (viewPager != null) { viewPager.setCurrentItem(pos); } if (callback != null) { callback.onItemSelected(pos); } } return true; } public interface Callback { void onItemSelected(int pos); } }