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<!DOCTYPE html>
<html lang="zh-CN">
<head>
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var NexT = window.NexT || {};
var CONFIG = {
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lazyload: false,
pangu: false,
algolia: {
appID: '',
apiKey: '',
indexName: '',
hits: {"per_page":10},
labels: {"input_placeholder":"搜索","hits_empty":"未找到与「 ${query} 」相关的内容","hits_stats":"找到 ${hits} 条相关条目，用时: ${time} ms"}
},
localsearch: {"enable":false,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},
path: '',
motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
translation: {
copy_button: '复制',
copy_success: '复制成功',
copy_failure: '复制失败'
}
};
</script>
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<h1 class="post-title" itemprop="name headline">
<a href="/2020/08/flutter-gesture-recognition-mechanism/" class="post-title-link" itemprop="url">Flutter 中的事件流和手势</a>
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<time title="创建时间：2020-08-28 22:37:33" itemprop="dateCreated datePublished" datetime="2020-08-28T22:37:33+08:00">2020-08-28</time>
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<time title="修改时间：2020-12-23 13:57:23" itemprop="dateModified" datetime="2020-12-23T13:57:23+08:00">2020-12-23</time>
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<h2 id="事件的来源"><a href="#事件的来源" class="headerlink" title="事件的来源"></a>事件的来源</h2><p>我们知道，Android 系统中，控件对手势事件的处理在 View 的 <code>onTouchEvent</code> 方法中，Flutter 也不例外，从 io.flutter.view.FlutterView 的这个方法开始，大致流程为将事件从 Java 转 C++ 再转 Dart 进入框架的处理流程。这里简单画个图，不详细展开。</p>
<h3 id="Android-gt-Engine-Java-gt-C"><a href="#Android-gt-Engine-Java-gt-C" class="headerlink" title="Android -> Engine (Java -> C++)"></a>Android -> Engine (Java -> C++)</h3><p><img src="https://raw.githubusercontent.com/Mupceet/article-piture/master/flutter-inputevent-android-to-engine.svg" alt="Android -> Engine"></p>
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<a href="/2020/07/repo-init-manifest-repository/" class="post-title-link" itemprop="url">Repo：init - 下载 Manifest 仓库</a>
</h1>
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<time title="创建时间：2020-07-06 04:35:33" itemprop="dateCreated datePublished" datetime="2020-07-06T04:35:33+08:00">2020-07-06</time>
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<time title="修改时间：2020-12-04 22:56:28" itemprop="dateModified" datetime="2020-12-04T22:56:28+08:00">2020-12-04</time>
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<p>从前文知道，<code>init</code> 命令的执行是通过 <code>init.py</code> 的 <code>Execute</code> 方法完成实际操作。该方法主要功能为下载 Manifest 仓库，整体流程如下图所示：</p>
<p><img src="https://raw.githubusercontent.com/Mupceet/article-piture/master/repo-init.png" alt="下载 Manifest 仓库"></p>
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<a href="/2020/05/repo-script-and-repo-repository/" class="post-title-link" itemprop="url">Repo：Repo 脚本与 Repo 仓库</a>
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<time title="创建时间：2020-05-24 09:57:33" itemprop="dateCreated datePublished" datetime="2020-05-24T09:57:33+08:00">2020-05-24</time>
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<p>Google 选择了 Git 作为 AOSP 的版本控制系统，而 AOSP 一方面为了方便项目的独立开发，另一方面也为了方便对部分组件进行定制，拆分成数百个 Git 项目。为了更好地管理这些仓库，创建了 Repo 工具进行批量的 Git 仓库管理。Repo 是基于 Git 构建的工具，因此，它的工作流与普通的 Git 工作流类似，它的存在是为了让 Git 在如此大的项目系统中更加好用。</p>
<h2 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h2><p>一个完整的使用 repo 管理的项目由三部分组成：</p>
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<li>子项目仓库</li>
<li>Manifest 仓库</li>
<li>Repo 仓库</li>
</ol>
<p>以 AOSP 为例，根据功能和模块，项目包括了数百个 Git 仓库，比如 framework 目录下有多个 Git 仓库，这些仓库就是众多的<strong>子项目仓库</strong>。而不同的 AOSP 版本、不同的定制产物版本，包含的子项目不完全相同，因此，通过一个 Git 仓库来管理各个版本的子项目信息，这个仓库就称为 <strong>Manifest 仓库</strong>。Repo 工具通过 Manifest 仓库里的信息对整个项目中的子项目进行操作，而 Repo 工具实际上是由一系列的 Python 脚本组成的，这些 Python 脚本通过调用 Git 命令来完成功能，这些脚本本身也通过 Git 仓库来管理，这个仓库就称为 <strong>Repo 仓库</strong>，并且我们每次执行 Repo 命令的时候，Repo 仓库都会对自己进行一次更新。</p>
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<p>若要直接查看安装 Node.js 的正确姿势，请拉到文章最后一节。</p>
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<h2 id="安装-Node"><a href="#安装-Node" class="headerlink" title="安装 Node"></a>安装 Node</h2><p>一般情况下，你第一次安装会这样：</p>
<p>首先到 <a href="https://nodejs.org/en/" target="_blank" rel="noopener">Node.js 官网</a>下载压缩包。下载得到 <code>node-vXxx.tar.xz</code>，然后解压到 <code>/opt/</code>（适用于共享用户）或 <code>/usr/local/</code>（适用于用户个人资料）。以 <code>/opt/</code> 为例：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span> cd ~/Download</span><br><span class="line"><span class="meta">$</span> tar -xvf node-v10.16.3-linux-x64.tar.xz</span><br><span class="line"><span class="meta">$</span> sudo mv node-v10.16.3-linux-x64 /opt/node</span><br></pre></td></tr></table></figure>
<p>然后将 <code>/opt/node/bin</code> 添加到 <code>PATH</code> 环境变量中，这样就可以从任意终端中执行 <code>npm</code> 命令了。确保环境变量生效可以执行命令看是否可以查看 node 版本。</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span> node -v</span><br></pre></td></tr></table></figure>
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<p>在过去 CPU 非常昂贵的时候，通常通过设定任务让其不间断执行以提高效率，而在今天几乎所有的计算机在大多数时间都是空闲的，运行的是事件驱动系统（Event Driven System）亦或叫响应式系统（Reactive System）。可以回忆下常听到的“中断（Interrupt）”一词。</p>
<p>响应式系统通常没有开始与结束的概念，而是始终运行着，只在处理事件（Event）时才获得控制权，实际执行的动作由事件与所处的状态（State）共同决定，而当前的状态与过去的事件顺序相关，因此，整个系统都是由事件驱动的。事件很大程度上以不可预测的顺序和时间到达，因此软件每次运行时调用的代码的路径很可能不同。</p>
<h2 id="有限状态机"><a href="#有限状态机" class="headerlink" title="有限状态机"></a>有限状态机</h2><p>状态机模型明确地声明了事件的处理依赖于<strong>事件</strong>与<strong>状态</strong>。当然你也可以使用条件语句和标志实现状态记录与事件响应，但这其中的可维护性与复杂度可想而知。状态机通过将状态和行为封装在一起，解决庞大分支语句带来的阅读性差和不方便扩展的问题，降低程序的复杂性，提升灵活性。</p>
<p>我们所说的状态机实际上是指 FSM（Finite State Machine，有限状态机），它表示有限个状态以及在这些状态下执行动作和状态转移等行为的模型。FSM 可分为两种类型：</p>
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<li>Moore Machine：状态机的<strong>输出只与当前状态相关</strong>，与当前的输入无关</li>
<li>Mealy Machine：状态机的<strong>输出与当前状态和当前输入有关</strong></li>
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<p>本文旨在解决在不同电脑上都能维护博客或配置、发布的内容丢失可恢复的问题。</p>
<p>观察部署到仓库的内容，我们可以看到上传的内容是 <code>public</code> 文件夹下的所有内容。事实上 <code>hexo-deploy-git</code> 插件是通过拷贝 <code>public</code> 文件夹内容到 <code>.deploy_git</code> 文件夹下，然后提交推送到远程分支上实现了网站文件的部署。</p>
<p>那我们的备份思路也可以这样，上传目录下的其他所有文件就可以了，同时我们不能修改博客的发布分支，因此考虑备份其他所有文件到新分支中。</p>
<p>最简单直接的方法就是在仓库创建一个新的分支，把本地所有的内容都上传到该分支上。但这样会备份一部分不必要的文件，例如 <code>public</code> 文件夹内容，它可以再次生成，就没有必要备份。</p>
<p>那具体要备份哪些文件呢？</p>
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