Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2016 Alibaba Group * * 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.taobao.weex.ui.component; import android.content.Context; import android.support.annotation.NonNull; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.text.TextUtils; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.FrameLayout; import com.taobao.weex.WXEnvironment; import com.taobao.weex.WXSDKInstance; import com.taobao.weex.WXSDKManager; import com.taobao.weex.annotation.Component; import com.taobao.weex.common.Constants; import com.taobao.weex.dom.WXDomObject; import com.taobao.weex.dom.WXEvent; import com.taobao.weex.ui.ComponentCreator; import com.taobao.weex.ui.view.WXCircleIndicator; import com.taobao.weex.ui.view.WXCirclePageAdapter; import com.taobao.weex.ui.view.WXCircleViewPager; import com.taobao.weex.ui.view.gesture.WXGestureType; import com.taobao.weex.utils.WXLogUtils; import com.taobao.weex.utils.WXUtils; import com.taobao.weex.utils.WXViewUtils; import java.lang.reflect.InvocationTargetException; import java.util.HashMap; import java.util.Map; @Component(lazyload = false) public class WXSlider extends WXVContainer<FrameLayout> { public static final String INDEX = "index"; Map<String, Object> params = new HashMap<>(); private float offsetXAccuracy = 0.1f; public static class Creator implements ComponentCreator { public WXComponent createInstance(WXSDKInstance instance, WXDomObject node, WXVContainer parent) throws IllegalAccessException, InvocationTargetException, InstantiationException { return new WXSlider(instance, node, parent); } } /** * Scrollable sliderview */ /** * package **/ WXCircleViewPager mViewPager; /** * Circle indicator */ protected WXIndicator mIndicator; /** * Adapter for sliderview */ protected WXCirclePageAdapter mAdapter; protected boolean mShowIndicators; protected OnPageChangeListener mPageChangeListener = new SliderPageChangeListener(); @Deprecated public WXSlider(WXSDKInstance instance, WXDomObject dom, WXVContainer parent, String instanceId, boolean isLazy) { this(instance, dom, parent); } public WXSlider(WXSDKInstance instance, WXDomObject node, WXVContainer parent) { super(instance, node, parent); } @Override protected FrameLayout initComponentHostView(@NonNull Context context) { FrameLayout view = new FrameLayout(context); // init view pager FrameLayout.LayoutParams pagerParams = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); mViewPager = new WXCircleViewPager(context); mViewPager.setLayoutParams(pagerParams); // init adapter mAdapter = new WXCirclePageAdapter(); mViewPager.setAdapter(mAdapter); // add to parent view.addView(mViewPager); mViewPager.addOnPageChangeListener(mPageChangeListener); registerActivityStateListener(); return view; } /** * Slider is not a regular container,top/left/right/bottom not apply to view,expect indicator. */ @Override public LayoutParams getChildLayoutParams(WXComponent child, View childView, int width, int height, int left, int right, int top, int bottom) { ViewGroup.LayoutParams lp = childView.getLayoutParams(); if (lp == null) { lp = new FrameLayout.LayoutParams(width, height); } else { lp.width = width; lp.height = height; } if (lp instanceof ViewGroup.MarginLayoutParams) { //expect indicator . if (child instanceof WXIndicator) { ((ViewGroup.MarginLayoutParams) lp).setMargins(left, top, right, bottom); } else { ((ViewGroup.MarginLayoutParams) lp).setMargins(0, 0, 0, 0); } } return lp; } @Override public void addEvent(String type) { super.addEvent(type); if (getRealView() != null) { getRealView().setOnTouchListener(null); } if (Constants.Event.SCROLL.equals(type)) { if (mViewPager == null) { return; } mViewPager.addOnPageChangeListener(new SliderOnScrollListener(this)); } } @Override public boolean containsGesture(WXGestureType WXGestureType) { //TODO Slider don't support any gesture for now. return false; } @Override public ViewGroup getRealView() { return mViewPager; } @Override protected void addSubView(View view, int index) { if (view == null || mAdapter == null) { return; } if (view instanceof WXCircleIndicator) { return; } mAdapter.addPageView(view); mViewPager.setCurrentItem(0); if (mIndicator != null) { mIndicator.getHostView().forceLayout(); mIndicator.getHostView().requestLayout(); } } @Override public void remove(WXComponent child, boolean destroy) { if (child == null || child.getHostView() == null || mAdapter == null) { return; } mAdapter.removePageView(child.getHostView()); mAdapter.notifyDataSetChanged(); super.remove(child, destroy); } @Override public void destroy() { super.destroy(); if (mViewPager != null) { mViewPager.stopAutoScroll(); mViewPager.removeAllViews(); mViewPager.destory(); } } @Override public void onActivityResume() { if (mViewPager != null && mViewPager.isAutoScroll()) { mViewPager.startAutoScroll(); } } @Override public void onActivityStop() { if (mViewPager != null) { mViewPager.pauseAutoScroll(); } } public void addIndicator(WXIndicator indicator) { FrameLayout root = getHostView(); if (root == null) { return; } mIndicator = indicator; WXCircleIndicator indicatorView = indicator.getHostView(); if (indicatorView != null) { indicatorView.setCircleViewPager(mViewPager); // indicatorView.setOnPageChangeListener(mPageChangeListener); // commented for twice onChange() called when do slide. root.addView(indicatorView); } } @Override protected boolean setProperty(String key, Object param) { switch (key) { case Constants.Name.VALUE: String value = WXUtils.getString(param, null); if (value != null) { setValue(value); } return true; case Constants.Name.AUTO_PLAY: String aotu_play = WXUtils.getString(param, null); if (aotu_play != null) { setAutoPlay(aotu_play); } return true; case Constants.Name.SHOW_INDICATORS: String indicators = WXUtils.getString(param, null); if (indicators != null) { setShowIndicators(indicators); } return true; case Constants.Name.INTERVAL: Integer interval = WXUtils.getInteger(param, null); if (interval != null) { setInterval(interval); } return true; case Constants.Name.INDEX: Integer index = WXUtils.getInteger(param, null); if (index != null) { setIndex(index); } return true; case Constants.Name.OFFSET_X_ACCURACY: Float accuracy = WXUtils.getFloat(param, 0.1f); if (accuracy != 0) { setOffsetXAccuracy(accuracy); } return true; case Constants.Name.SCROLLABLE: boolean scrollable = WXUtils.getBoolean(param, true); setScrollable(scrollable); return true; } return super.setProperty(key, param); } @Deprecated @WXComponentProp(name = Constants.Name.VALUE) public void setValue(String value) { if (value == null || getHostView() == null) { return; } int i; try { i = Integer.parseInt(value); } catch (NumberFormatException e) { WXLogUtils.e("", e); return; } setIndex(i); } @WXComponentProp(name = Constants.Name.AUTO_PLAY) public void setAutoPlay(String autoPlay) { if (TextUtils.isEmpty(autoPlay) || autoPlay.equals("false")) { mViewPager.stopAutoScroll(); } else { mViewPager.stopAutoScroll(); mViewPager.startAutoScroll(); } } @WXComponentProp(name = Constants.Name.SHOW_INDICATORS) public void setShowIndicators(String show) { if (TextUtils.isEmpty(show) || show.equals("false")) { mShowIndicators = false; } else { mShowIndicators = true; } if (mIndicator == null) { return; } mIndicator.setShowIndicators(mShowIndicators); } @WXComponentProp(name = Constants.Name.INTERVAL) public void setInterval(int intervalMS) { if (mViewPager != null && intervalMS > 0) { mViewPager.setIntervalTime(intervalMS); } } @WXComponentProp(name = Constants.Name.INDEX) public void setIndex(int index) { if (mViewPager != null && mAdapter != null) { if (index >= mAdapter.getRealCount() || index < 0) { return; } mViewPager.setCurrentItem(index); if (mIndicator != null && mIndicator.getHostView() != null && mIndicator.getHostView().getRealCurrentItem() != index) { //OnPageChangeListener not triggered WXLogUtils.d("setIndex >>>> correction indicator to " + index); mIndicator.getHostView().setRealCurrentItem(index); mIndicator.getHostView().invalidate(); if (mPageChangeListener != null && mAdapter != null) { mPageChangeListener.onPageSelected(mAdapter.getFirst() + index); } } } } @WXComponentProp(name = Constants.Name.SCROLLABLE) public void setScrollable(boolean scrollable) { if (mViewPager != null && mAdapter != null) { if (mAdapter.getRealCount() > 0) { mViewPager.setScrollable(scrollable); } } } @WXComponentProp(name = Constants.Name.OFFSET_X_ACCURACY) public void setOffsetXAccuracy(float accuracy) { this.offsetXAccuracy = accuracy; } protected class SliderPageChangeListener implements OnPageChangeListener { private int lastPos = -1; @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int pos) { if (mAdapter.getRealPosition(pos) == lastPos) { return; } if (WXEnvironment.isApkDebugable()) { WXLogUtils.d("onPageSelected >>>>" + mAdapter.getRealPosition(pos) + " lastPos: " + lastPos); } if (mAdapter == null || mAdapter.getRealCount() == 0) { return; } int realPosition = mAdapter.getRealPosition(pos); if (mChildren == null || realPosition >= mChildren.size()) { return; } if (getDomObject().getEvents().size() == 0) { return; } WXEvent event = getDomObject().getEvents(); String ref = getDomObject().getRef(); if (event.contains(Constants.Event.CHANGE) && WXViewUtils.onScreenArea(getHostView())) { params.put(INDEX, realPosition); Map<String, Object> domChanges = new HashMap<>(); Map<String, Object> attrsChanges = new HashMap<>(); attrsChanges.put(INDEX, realPosition); domChanges.put("attrs", attrsChanges); WXSDKManager.getInstance().fireEvent(getInstanceId(), ref, Constants.Event.CHANGE, params, domChanges); } mViewPager.requestLayout(); getHostView().invalidate(); lastPos = mAdapter.getRealPosition(pos); } @Override public void onPageScrollStateChanged(int arg0) { FrameLayout root = getHostView(); if (null != root) { root.invalidate(); } } } protected static class SliderOnScrollListener implements OnPageChangeListener { private float lastPositionOffset = 99f; private int selectedPosition; private WXSlider target; public SliderOnScrollListener(WXSlider target) { this.target = target; this.selectedPosition = target.mViewPager.superGetCurrentItem(); } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { if (lastPositionOffset == 99f) { lastPositionOffset = positionOffset; return; } float offset = positionOffset - lastPositionOffset; if (Math.abs(offset) >= target.offsetXAccuracy) { if (position == selectedPosition) { //slide to left. positionOffset[0 -> 1] Map<String, Object> event = new HashMap<>(1); event.put(Constants.Name.OFFSET_X_RATIO, -positionOffset); target.fireEvent(Constants.Event.SCROLL, event); } else if (position < selectedPosition) { //slide to right. positionOffset[1 -> 0] Map<String, Object> event = new HashMap<>(1); event.put(Constants.Name.OFFSET_X_RATIO, (1f - positionOffset)); target.fireEvent(Constants.Event.SCROLL, event); } lastPositionOffset = positionOffset; } } @Override public void onPageSelected(int position) { selectedPosition = position; } @Override public void onPageScrollStateChanged(int state) { if (state == ViewPager.SCROLL_STATE_IDLE) { lastPositionOffset = 99f; } } } }