From b485273576aa6addb60bc104de9412a75b799d19 Mon Sep 17 00:00:00 2001
From: kdxcxs <cx@kdxcxs.com>
Date: Fri, 4 Dec 2020 23:27:45 +0800
Subject: [PATCH] feat: support go to detail view of a topic by pressing in the
 topic list view

---
 README.md                      |  2 +
 src/component/YooForumTopic.js | 14 ++++++
 src/ui/YooForumTopicUI.js      | 62 +++++++++++++++++++++----
 src/ui/YooForumUI.js           | 84 ++++++++++++++++++++++++++++++++--
 4 files changed, 149 insertions(+), 13 deletions(-)
 create mode 100644 src/component/YooForumTopic.js

diff --git a/README.md b/README.md
index 19cd3f6..6e14225 100644
--- a/README.md
+++ b/README.md
@@ -15,4 +15,6 @@
 - [ ] 在启动时检测是否已登录
 - [ ] Splash 检测网络出错后在 Splash UI 中显示错误并不跳转
 - [ ] Forum 初始化失败后 UI 显示错误信息
+- [ ] 当数据获取完成后通过动画转到话题列表
+- [ ] 解决当动画进行时点击话题标题动画会被打断的问题
 
diff --git a/src/component/YooForumTopic.js b/src/component/YooForumTopic.js
new file mode 100644
index 0000000..04db5a5
--- /dev/null
+++ b/src/component/YooForumTopic.js
@@ -0,0 +1,14 @@
+import React, {Component} from 'react';
+import YooForumTopicUI from '../ui/YooForumTopicUI';
+
+export default class YooForumTopic extends Component {
+  render() {
+    return (
+      <YooForumTopicUI
+        topic={this.props.topic}
+        showDetail={this.props.showDetail}
+        hideDetail={this.props.hideDetail}
+      />
+    );
+  }
+}
diff --git a/src/ui/YooForumTopicUI.js b/src/ui/YooForumTopicUI.js
index c43de2b..2e31704 100644
--- a/src/ui/YooForumTopicUI.js
+++ b/src/ui/YooForumTopicUI.js
@@ -1,25 +1,69 @@
-import React, {Component} from 'react';
-import {View, Text, StyleSheet} from 'react-native';
+import React, {Component, createRef} from 'react';
+import {
+  Animated,
+  View,
+  Text,
+  StyleSheet,
+  Pressable,
+  Dimensions,
+} from 'react-native';
 
+const screenWidth = Dimensions.get('window').width;
 const styles = StyleSheet.create({
   container: {
-    borderWidth: 1,
+    backgroundColor: 'mintcream',
+    borderRadius: 8,
+    padding: 16,
+    margin: 8,
+    width: screenWidth - 16,
   },
   title: {
-    fontSize: 36,
+    fontSize: 24,
   },
   owner: {
-    fontSize: 24,
+    fontSize: 16,
   },
 });
+const AnimatedPressable = Animated.createAnimatedComponent(Pressable);
 
 export default class YooForumTopicUI extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      detailShowing: false,
+      layoutY: 0,
+      translate: new Animated.ValueXY({x: 0, y: 0}),
+    };
+    this.topicHeaderRef = createRef();
+    this.onPress = this.onPress.bind(this);
+  }
+
+  onPress() {
+    if (!this.state.detailShowing) {
+      this.setState({detailShowing: true});
+      this.props.showDetail(this);
+    } else {
+      this.setState({detailShowing: false});
+      this.props.hideDetail(this);
+    }
+  }
+
   render() {
     return (
-      <View style={styles.container}>
-        <Text style={styles.title}>{this.props.topic.title}</Text>
-        <Text style={styles.owner}>{this.props.topic.owner}</Text>
-      </View>
+      <AnimatedPressable
+        style={[
+          styles.container,
+          {transform: this.state.translate.getTranslateTransform()},
+        ]}
+        onPress={this.onPress}
+        onLayout={(event) => {
+          this.setState({layoutY: event.nativeEvent.layout.y});
+        }}>
+        <View ref={this.topicHeaderRef}>
+          <Text style={styles.owner}>{this.props.topic.owner}</Text>
+          <Text style={styles.title}>{this.props.topic.title}</Text>
+        </View>
+      </AnimatedPressable>
     );
   }
 }
diff --git a/src/ui/YooForumUI.js b/src/ui/YooForumUI.js
index 1b285a2..ac1200c 100644
--- a/src/ui/YooForumUI.js
+++ b/src/ui/YooForumUI.js
@@ -6,13 +6,21 @@ import {
   StyleSheet,
   ActivityIndicator,
   Image,
+  Animated,
+  Dimensions,
 } from 'react-native';
-import YooForumTopicUI from './YooForumTopicUI';
+import YooForumTopic from '../component/YooForumTopic';
 
+const screenWidth = Dimensions.get('window').width;
+const AnimatedScrollView = Animated.createAnimatedComponent(ScrollView);
 const styles = StyleSheet.create({
+  container: {
+    width: screenWidth * 2,
+  },
   hintContainer: {
     flex: 1,
     alignItems: 'center',
+    left: -screenWidth / 2,
   },
   logo: {
     marginTop: 120,
@@ -30,12 +38,80 @@ const styles = StyleSheet.create({
 });
 
 export default class YooForumUI extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      scrollEnabled: true,
+      currentPosition: 0,
+      translateX: new Animated.Value(0),
+    };
+    this.showDetail = this.showDetail.bind(this);
+    this.hideDetail = this.hideDetail.bind(this);
+  }
+
+  showDetail(topicRef) {
+    this.setState({scrollEnabled: false});
+    Animated.parallel([
+      Animated.timing(topicRef.state.translate, {
+        toValue: {
+          x: screenWidth,
+          y: this.state.currentPosition - topicRef.state.layoutY + 8,
+        },
+        duration: 500,
+        useNativeDriver: true,
+      }),
+      Animated.timing(this.state.translateX, {
+        toValue: -screenWidth,
+        duration: 500,
+        useNativeDriver: true,
+      }),
+    ]).start();
+  }
+
+  hideDetail(topicRef) {
+    this.setState({scrollEnabled: true});
+    Animated.parallel([
+      Animated.timing(topicRef.state.translate, {
+        toValue: {
+          x: 0,
+          y: 0,
+        },
+        duration: 500,
+        useNativeDriver: true,
+      }),
+      Animated.timing(this.state.translateX, {
+        toValue: 0,
+        duration: 500,
+        useNativeDriver: true,
+      }),
+    ]).start();
+  }
+
   render() {
     return (
-      <ScrollView>
+      <AnimatedScrollView
+        style={[
+          styles.container,
+          {
+            transform: [
+              {
+                translateX: this.state.translateX,
+              },
+            ],
+          },
+        ]}
+        scrollEnabled={this.state.scrollEnabled}
+        onScroll={(event) =>
+          this.setState({currentPosition: event.nativeEvent.contentOffset.y})
+        }>
         {this.props.hint === '' ? (
           this.props.topics.map((topic, key) => (
-            <YooForumTopicUI topic={topic} key={key} />
+            <YooForumTopic
+              key={key}
+              topic={topic}
+              showDetail={this.showDetail}
+              hideDetail={this.hideDetail}
+            />
           ))
         ) : (
           <View style={styles.hintContainer}>
@@ -51,7 +127,7 @@ export default class YooForumUI extends Component {
             />
           </View>
         )}
-      </ScrollView>
+      </AnimatedScrollView>
     );
   }
 }