Java tutorial
/* * MIT License * * Copyright (c) 2018 Alibaba Group * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package com.tmall.wireless.tangram3.support; import android.support.v4.util.ArrayMap; import android.util.Log; import android.view.View; import com.tmall.wireless.tangram3.dataparser.concrete.Cell; import com.tmall.wireless.tangram3.structure.BaseCell; import com.tmall.wireless.tangram3.util.LogUtils; import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; /** * ClickSupport which provide a group of methods to handle click events on ComponentViews * <p> * Usage: * <p> * <pre> * SimpleClickSupport support = serviceManager.getService(SimpleClickSupport.class) * support.onClick(targetView, thisCell, mEventType, [params]); * </pre> * <p> * Which make all the click handlers registered in one place, and decouple the business logic from ComponentViews */ public abstract class SimpleClickSupport { private static final String TAG = "SimpleClickSupport"; private static final String ON_CLICK_METHOD_NAME = "onClick"; private static final String ON_CLICK_METHOD_PREFIX = "on"; private static final String ON_CLICK_METHOD_POSTFIX = "Click"; /** * Ignore bridge or synthetic methods that added by compiler */ private static final int BRIDGE = 0x40; private static final int SYNTHETIC = 0x1000; private static final int MODIFIERS_IGNORE = Modifier.ABSTRACT | Modifier.STATIC | BRIDGE | SYNTHETIC; private final Map<Class<?>, OnClickMethod> mOnClickMethods = new ArrayMap<>(); private boolean optimizedMode; public SimpleClickSupport() { } /** * enable opt mode, users route click handler by themselves, otherwise click handler is routed by inner and invoked by reflection * @param optimizedMode true to enable opt mode */ public void setOptimizedMode(boolean optimizedMode) { this.optimizedMode = optimizedMode; } private void findClickMethods(Method[] methods) { for (Method method : methods) { String methodName = method.getName(); if (isValidMethodName(methodName)) { int modifiers = method.getModifiers(); if ((modifiers & Modifier.PUBLIC) != 0 && (modifiers & MODIFIERS_IGNORE) == 0) { Class<?>[] parameterTypes = method.getParameterTypes(); if (parameterTypes.length == 3 || parameterTypes.length == 4) { Class<?> viewType = parameterTypes[0]; Class<?> cellType = parameterTypes[1]; Class<?> clickIntType = parameterTypes[2]; if (View.class.isAssignableFrom(viewType) && BaseCell.class.isAssignableFrom(cellType) && (clickIntType.equals(int.class) || clickIntType.equals(Integer.class))) { if (parameterTypes.length == 4) { Class<?> clickParamsType = parameterTypes[3]; if (Map.class.isAssignableFrom(clickParamsType)) { mOnClickMethods.put(viewType, new OnClickMethod(4, method)); } } else { mOnClickMethods.put(viewType, new OnClickMethod(3, method)); } } } } } } } private boolean isValidMethodName(String methodName) { return !methodName.equals(ON_CLICK_METHOD_NAME) && methodName.startsWith(ON_CLICK_METHOD_NAME) || (methodName.startsWith(ON_CLICK_METHOD_PREFIX) && methodName.endsWith(ON_CLICK_METHOD_POSTFIX)); } /** * Handler click event on item * * @param targetView the view that trigger the click event, not the view respond the cell! * @param cell the corresponding cell * @param eventType click event type, defined by developer. */ public void onClick(View targetView, BaseCell cell, int eventType) { if (cell instanceof Cell) { onClick(targetView, (Cell) cell, eventType); } else { onClick(targetView, cell, eventType, null); } } public void onClick(View targetView, Cell cell, int eventType) { onClick(targetView, cell, eventType, null); } public void onClick(View targetView, BaseCell cell, int eventType, Map<String, Object> params) { if (optimizedMode) { defaultClick(targetView, cell, eventType); } else { if (mOnClickMethods.isEmpty()) { findClickMethods(this.getClass().getMethods()); } List<Class<?>> classes = lookupCellTypes(targetView.getClass()); for (Class clz : classes) { if (clz.equals(View.class)) { continue; } if (mOnClickMethods.containsKey(clz)) { OnClickMethod onClickMethod = mOnClickMethods.get(clz); try { if (onClickMethod.paramLength == 3) { onClickMethod.method.invoke(this, targetView, cell, eventType); return; } else if (onClickMethod.paramLength == 4) { onClickMethod.method.invoke(this, targetView, cell, eventType, params); return; } } catch (Exception e) { LogUtils.e(TAG, "Invoke onClick method error: " + Log.getStackTraceString(e), e); } } } defaultClick(targetView, cell, eventType); } } public void defaultClick(View targetView, BaseCell cell, int eventType) { } private static final Map<Class<?>, List<Class<?>>> cellTypesCache = new ConcurrentHashMap<>(); private List<Class<?>> lookupCellTypes(Class<?> cellClass) { List<Class<?>> eventTypes = cellTypesCache.get(cellClass); if (eventTypes == null) { eventTypes = new ArrayList<>(); Class<?> clazz = cellClass; while (clazz != null && !clazz.equals(BaseCell.class)) { eventTypes.add(clazz); clazz = clazz.getSuperclass(); } cellTypesCache.put(cellClass, eventTypes); } return eventTypes; } static class OnClickMethod { int paramLength; Method method; public OnClickMethod(int paramLength, Method method) { this.paramLength = paramLength; this.method = method; } } public void destroy() { } }