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Flutter 124: 日常問題小結(jié) (三) 自定義 Dialog 二三事

針對日常不同的需求,我們時常需要自定義 Dialog ,而小菜在嘗試過程中遇到一些小問題,簡單記錄總結(jié)一下;

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小菜在自定義含有文本框的 Dialog 時,文本框獲取焦點時,軟鍵盤會部分遮擋對話框,但當(dāng)小菜替換為 AlertDialog 時,文本框獲取焦點時,對話框會向上浮動,避免軟鍵盤遮擋;

對于含有文本框的自定義 Dialog ,小菜在最外層使用的是 Material 嵌套,小菜通過采用 Scaffold 來嵌套處理,默認(rèn) Scaffold 中 resizeToAvoidBottomPadding / resizeToAvoidBottomInset 為 true ,當(dāng)設(shè)置為 false 時,文本框獲取焦點時,依舊會被軟鍵盤遮擋;因為在固定情景可以配合 resizeToAvoidBottomPadding 實現(xiàn)是否被軟鍵盤遮擋效果;

resizeToAvoidBottomPadding 主要用于自身 Widget 是否避免被其他窗口遮擋;其中小菜查資料介紹在 Flutter 1.1.9 之后更推薦使用 resizeToAvoidBottomInset ;

小菜自定義一個可以多選 item 的 Dialog ,但 Dialog 中并沒有狀態(tài)更新的 State ,如何進(jìn)行 Dialog 中狀態(tài)更新呢?

小菜之前在 showDialog 時直接創(chuàng)建了 TypeListDialog ,此時是無狀態(tài)的,當(dāng) WidgetBuilder 創(chuàng)建一個 StatefulBuilder 有狀態(tài)的構(gòu)造器即可,可以將 state 傳遞到 Dialog 中;

小菜在自定義 Dialog 時如何在一個回調(diào)方法中傳遞多個參數(shù)?

小菜在 Dialog 的回調(diào)方法中傳遞兩個 List ,而在接收回調(diào)方法中匹配兩個參數(shù)即可;小菜簡單看作是一個函數(shù)方法;

小菜在重寫 AppBar 時,如何取消默認(rèn)的返回按鈕?

取消 AppBar 前面的返回圖標(biāo)有多種方式;

自定義 Dialog 案例源碼

小菜對于 Flutter 的應(yīng)用還不夠熟悉,很多常用的場景會處理的很不到位,小菜會對日常的小問題進(jìn)行簡單記錄,逐步學(xué)習(xí);如有錯誤,請多多指導(dǎo)!

Flutter入門這一篇效率文章就夠了

本文面向 Flutter 初學(xué)者,旨在用易懂的方式帶大家入門。除了 Flutter 代碼,還會介紹到語法、原理、特性等基礎(chǔ)知識。相信本文能幫助你學(xué)習(xí)和理解 Flutter。

我們先看一下目前的一些跨平臺方案,從前端渲染的角度來分類的話,大致可以分為以下幾種方案。

WebView 渲染

這種方案就很好理解,現(xiàn)在很多項目都會嵌入 H5 的頁面。就是用 JavaScript 等前端技術(shù)進(jìn)行開發(fā),在客戶端上用 WebView 來進(jìn)行渲染。微信小程序目前使用的就是這種方案。

它的優(yōu)點很明顯,使用成熟的前端技術(shù)進(jìn)行開發(fā),學(xué)習(xí)成本低,開發(fā)效率高,并且支持動態(tài)發(fā)布代碼。

但缺點也很明顯,在性能體驗上,和原生還是存在較大差距的。

原生控件渲染

既然 WebView 的性能不夠好,于是就有了使用原生控件進(jìn)行渲染的方案。這種方案,同樣也是使用 JavaScript 開發(fā),區(qū)別是它最終是調(diào)用原生控件進(jìn)行渲染的。這種方案的代表是 Facebook 的 React Native。

由于使用原生控件進(jìn)行渲染,性能體驗也會更接近原生。但也只是更接近,和原生還是有差距的,因為它需要頻繁的進(jìn)行 JavaScript 和原生之間的通信,這個通信效率是比較低的。

另外,由于需要適配各個平臺的控件,那就有可能出現(xiàn),系統(tǒng)控件更新了,而框架本身還沒有更新,由此產(chǎn)生了一些問題。換句話說,這種方案是受到原生控件限制的。

繪圖引擎渲染

接下來就是主角了。

在前端,如果完全不使用原生控件,我們可以通過系統(tǒng)的繪圖 API 繪制出一個用戶界面。從這個角度出發(fā),可以在各個平臺使用一個統(tǒng)一接口的繪圖引擎來進(jìn)行界面繪制,這個引擎最終調(diào)用的是系統(tǒng)的 API 繪制的。這樣的話,它的性能可以做到接近原生,并且又不受原生控件的限制,在不同平臺上能夠做到 UI 統(tǒng)一。

Flutter 就是這樣的一個開發(fā)框架。

一個跨平臺 UI 解決方案

Flutter 是由 Google 開發(fā)的,一個跨平臺 UI 解決方案。換句話說,它原則上只管 UI 的問題,如果涉及到平臺本身的一些功能,比如調(diào)用藍(lán)牙、攝像頭,一般還是需要原生代碼去操作。但現(xiàn)在也會有一些第三方庫幫我們解決這些問題。

繪圖引擎 Skia

Flutter 使用 Skia 作為它的繪圖引擎。Skia 已經(jīng)被 Google 收購,目前很多 Google 旗下的產(chǎn)品都是用 Skia 繪制的,包括 Android。

Android 內(nèi)置了 Skia,但 iOS 沒有,所以在打 iOS 安裝包的時候,會把 Skia 一起打進(jìn)去。這就導(dǎo)致了,用同一份 Flutter 代碼打包之后,iOS 的包要比 Android 的包大一些。

開發(fā)語言 Dart

Flutter 使用的開發(fā)語言,叫 Dart。Dart 也是 Google 自家的,它是一門面向?qū)ο蟮恼Z言,從它身上會看到一些其他開發(fā)語言的影子。學(xué)習(xí)起來難度不大的。

前面講跨平臺方案的時候,可以發(fā)現(xiàn)別的方案基本都是用 JavaScript 作為開發(fā)語言的,但為什么 Flutter 不用?就因為 Dart 是谷歌自家的嗎?這個問題先留著,我們后面會提到。

這里部分就簡單點帶過了,具體的搭建流程可以在官網(wǎng)查看:

主要的搭建步驟如下:

下載 Flutter SDK

官網(wǎng)下載地址:

由于在國內(nèi)訪問可能受限,官方為中國開發(fā)者搭建了鏡像:

更新環(huán)境變量

解壓后,將 flutter\bin 的全路徑添加到環(huán)境變量 PATH 中。

安裝開發(fā)工具

理論上,任何文本編輯器都可以用來開發(fā) Flutter 應(yīng)用,但推薦的開發(fā)工具是 Android Studio、IntelliJ 以及 VS Code。因為在這些開發(fā)工具上,可以安裝官方的 Flutter 和 Dart 插件,得到更好的開發(fā)體驗。文章里使用 Android Studio 來演示。

如果你打算開發(fā) iOS 應(yīng)用,則還需要安裝 Xcode。

安裝插件

在開發(fā)工具的插件設(shè)置中,安裝上面說到的 Flutter 和 Dart 插件。Flutter 插件用于支持 Flutter 的運行、調(diào)試、熱重載等功能,而 Dart 插件則提供了代碼的輸入校驗、代碼補全等功能。

萬物始于 Hello World,我們先來創(chuàng)建一個顯示 Hello World 的 Flutter 項目。

在 Android Studio 的歡迎頁面選擇 Start a new Flutter project ,或者通過菜單欄的 File New New Flutter Project ,創(chuàng)建一個新的 Flutter 項目。

創(chuàng)建好的項目里面包含了 android 和 ios 兩個文件夾,它們是標(biāo)準(zhǔn)的 Android 和 iOS 項目。我們的 Flutter 代碼,存放在 lib 文件夾里。項目創(chuàng)建好后,會默認(rèn)帶一個計數(shù)器的示例,我們不管它,把 main.dart 的代碼改成 Hello World:

啟動一個模擬器,或者連上真機(jī),點擊 Run 運行一下,就能看這樣一個界面了:

具體代碼先混個眼熟就好,具體的后面會再講到。

在寫 Flutter 之前,還要先跟大家簡單介紹一下 Dart 的語法。如果你有 Java 或 JavaScript 的開發(fā)經(jīng)驗,以及面向?qū)ο蟮木幊趟枷耄瑢W(xué)起來是很快的。

我們可以在 test 文件夾下新建一個 dart 文件,用來寫測試代碼。

指定類型

var

但和 JavaScript 不同的是,以下代碼在 JavaScript 是不會報錯的,但在 Dart 里會報錯:

Object

如果非要上面這樣寫,那也可以。把 var 換成 Object 就不報錯了:

和 Java 類似,Object 是所有對象的根基類。但是這樣的話,如果想打印一下 num 的字符串長度,是會報錯的:

因為 length 是屬于 String 的,但系統(tǒng)只知道 num 是一個對象,并不知道它是一個 String。

dynamic

如果還是非要這樣寫,那也可以。Dart 有一個特有的關(guān)鍵字 dynamic,把 Object 改成 dynamic 就不報錯了:

我們運行一下這個文件,可以在控制臺看到正確打印出了字符串長度。

函數(shù)

dynamic

在 Dart 里,函數(shù)也是可以不寫返回類型的,不寫的話會被當(dāng)做 dynamic 來處理。這樣的話,函數(shù)的類型就是 return 的類型,如果沒有 return 則是 void 類型。比如可以這樣:

運行之后是能正確打印出字符串長度的。

用于傳參

Dart 里的函數(shù)也是一個對象,所以可以把函數(shù)作為參數(shù)來傳遞,比如:

可選參數(shù)

在 Dart 的函數(shù)傳參里,有一個叫可選參數(shù)的概念,我們以文字控件 Text 為例,在源碼里可以看到 Text 的構(gòu)造函數(shù)是這樣的:

首先,在參數(shù)里有一個 data,它是要顯示的文字內(nèi)容,是一個必填項。而 data 后面的一堆參數(shù),是用一個大括號括起來的,這些參數(shù)就叫做可選參數(shù),意思是這些參數(shù)可傳可不傳。

假如我們要顯示一個比較長的文字,又想限制它最多顯示兩行,就可以這樣來創(chuàng)建一個 Text:

可選參數(shù),在 Flutter 里面用的非常多。

異步

Future

在 Dart 里使用 Future 來處理異步任務(wù),比如我們現(xiàn)在延時一秒打印 666,代碼如下:

Future 的語法和 Promise 非常像。任務(wù)執(zhí)行成功會調(diào)用 then,執(zhí)行失敗會調(diào)用 catchError,而無論成功還是失敗,都會調(diào)用 whenComplete。

async/await

如果你不喜歡上面那種寫法,或者是想把異步轉(zhuǎn)成同步,就可以用 async 和 await 這兩個關(guān)鍵字來轉(zhuǎn)換。

我們把上面的代碼轉(zhuǎn)換一下,寫一個 getString 方法,返回的類型是 Future,它會延時返回一個字符串。在 main 函數(shù)后面加上 async 關(guān)鍵字,在 getString() 前面加上 await,代碼如下:

運行之后可以看到,能正常延時一秒后,把字符串打印出來。這里 getString() 返回的類型是 Future,而 await getString() 則是返回了延時之后返回的字符串。await 要在 async 的函數(shù)里面才能使用。

async 和 await 其實是一個語法糖,它最終也是轉(zhuǎn)換成 Future 調(diào)用鏈的形式執(zhí)行的。

接下來回到 Flutter,F(xiàn)lutter 里最重要的一個概念是 Widget(下面翻譯作控件)。

在原生開發(fā)里面,我們可能會在界面上區(qū)分,這是一個 View,這是一個 Layout,這是一個 View Controller。但在 Flutter 里面,它們?nèi)紝儆谝粋€統(tǒng)一的模型 Widget??梢哉f,在 Flutter 界面里,所有東西都是 Widget。

以前學(xué)面向?qū)ο蟮臅r候,我們都聽過一句話,叫萬物皆對象。我這里套用一下,在 Flutter 里, 萬物皆控件 。

具體有哪些控件,我做了一下簡單的分類。

根控件

所有的控件都屬于 StatefulWidget 或 StatelessWidget 。它們的區(qū)別是,StatefulWidget 擁有狀態(tài) State ,而 StatelessWidget 沒有。

StatefulWidget

當(dāng)一個控件是可變的時候,就要使用 StatefulWidget 來構(gòu)建。StatefulWidget 本身不可變,但它持有的狀態(tài) State 是可變的。

StatelessWidget

當(dāng)一個控件狀態(tài)是固定不可變的時候,就可以使用 StatelessWidget。前面我們寫的 Hello World 就是使用 StatelessWidget。

容器控件

容器類控件一般是將某些屬性或配置,作用在它的子控件上,比如控件所在的寬高、背景、位置等。

常用的容器控件有 Container、Center、Padding 等。

布局控件

布局控件可以類比作原生開發(fā)中的 Layout,通常它會擁有一個 children 的屬性,用于接收一個控件數(shù)組,對這些控件進(jìn)行特定的排版。

常用的布局控件有 Row、Column、Stack、Flex 等。

基礎(chǔ)控件

基礎(chǔ)控件就是常用的文字、按鈕、圖片等控件。

常用的基礎(chǔ)控件有 Text、TextField、Button、Image 等。

功能控件

在 Flutter 里還有一類控件,它們不影響 UI 布局,但帶有一些特定的功能,比如頁面跳轉(zhuǎn)、事件監(jiān)聽、定義主題等。我們把這一類控件稱作功能控件。

常用的功能控件有 Navigator、NotificationListener、Theme 等。

開始寫 Flutter 代碼了。還記不記得,在 Flutter 項目創(chuàng)建之后,是自帶一個計數(shù)器 demo 的,現(xiàn)在我們用自己的代碼實現(xiàn)一遍。代碼修改成如下:

運行之后,就可以看到這樣的界面了:

按鈕每點擊一次,數(shù)字就會加一。下面我們來分析一下這段代碼,看下里面用到的一些 Widget。

StatefulWidget

由于頁面中的數(shù)字是跟隨狀態(tài)變化的,所以該頁面改用 StatefulWidget。StatefulWidget 并不會直接返回一個 Widget,而是返回狀態(tài) State,在 State 里再返回 Widget。

Scaffold

Scaffold 是一個標(biāo)準(zhǔn)的 Material Design 頁面,它包含了標(biāo)題欄、浮動按鈕、側(cè)滑菜單、底部導(dǎo)航欄等配置。我們這里用到了標(biāo)題欄 appBar、頁面內(nèi)容 body、浮動按鈕 floatingActionButton。

AppBar

AppBar 就是標(biāo)題欄,通過查看控件的構(gòu)造方法,我們可以知道它可配置的屬性。

AppBar 的可選參數(shù)除了標(biāo)題 title,還可以配置標(biāo)題前的內(nèi)容 leading,右側(cè)的操作按鈕 anctions,控件垂直高度 elevation 等。我們只傳了 title,其他屬性都用默認(rèn)值。

Center

Center 是一個容器類控件,它的作用就是讓它的子控件居中顯示。

FloatingActionButton

熟悉安卓開發(fā)的應(yīng)該對這個控件比較熟悉,它就是頁面右下角一個特定樣式的 Button,參數(shù)里面的 onPressed 是一個必填項,要傳一個點擊之后的回調(diào)函數(shù)。

根據(jù)這個例子,下面給大家介紹一下 Flutter 兩個比較重要的特性。

點擊 Button 之后,我們把 num 變量加一,并使用 setState 通知狀態(tài)發(fā)生了改變,F(xiàn)lutter 會根據(jù)新的狀態(tài)更新 UI。如果有接觸過小程序開發(fā),setState 就和小程序的 setData 類似。

在 Flutter 里面我們不需要用 set 方法來更新 UI,可變控件是和狀態(tài)綁定的,這就是 Flutter 的響應(yīng)式 UI 編程。

在 Android Q 和 iOS 13 里都加入了暗黑模式,我們也換一個暗黑主題來玩一下。MaterialApp 里有一個 theme 的屬性,我們把它配置一下:

這次改完之后不點 Run 了,我們點一下閃電圖標(biāo) Flutter Hot Reload ,就能看到界面發(fā)生了變化:

這就是 Flutter 的 熱重載 ,在修改完代碼之后,通過熱重載就能馬上在設(shè)備上看到修改結(jié)果,可以很大程度上增加開發(fā)效率。

下面再給大家介紹幾個 Flutter 里的常見操作。

在 Flutter 里,使用 Navigator 來管理頁面跳轉(zhuǎn),比如要跳轉(zhuǎn)到一個 NewPage 可以這樣寫:

進(jìn)棧使用 push,出棧則是 pop。

使用 MaterialPageRoute 會模擬出 Android 上頁面跳轉(zhuǎn)的過場效果。

我們來看看怎么顯示一張本地圖片。

先在根目錄新建一個存放圖片的文件夾,比如叫 images,把圖片 picture.png 放進(jìn)去。

找到根目錄下的 pubspec.yaml 文件,這個便是 Flutter 依賴配置文件,我們需要在這里配置一下剛才的圖片:

這樣,我們就能使用 Image 控件把這張圖片顯示出來了:

和 node 的 npm 以及 Android 的 jcenter 類似,F(xiàn)lutter 也擁有一個公共倉庫 pub.dev。pub.dev 是 Google 官方的 Dart 倉庫,在上面可以找到我們需要的包和插件。

Flutter 本身沒有 Toast,我們來接入一個。在 pub.dev 上搜索后,我決定使用 fluttertoast:

按照說明,在 pubspec.yaml 文件里的 dependencies 下配置:

點一下 Android Studio 右上角的 Packages get 同步之后就可以使用了:

我們上面使用的都是 Material Design 的控件,它們都是在 flutter/material.dart 包里面的。如果要使用 iOS 風(fēng)格的控件,則要用到 flutter/cupertino.dart 包:

iOS 風(fēng)格的控件,基本都以 Cupertino 開頭。我們把計時器頁面里的控件替換一下:

效果如下:

代碼的部分就到這里了,接下來跟大家聊一下編譯方式,編程語言的編譯方式有兩種。

關(guān)于它們孰優(yōu)孰劣,就要看從哪個角度去對比了。JIT 的話,它的一大特點就是支持動態(tài)發(fā)布代碼,也就是支持熱更新。但要是從性能的角度考慮,AOT 會更好,因為在運行的時候不用再進(jìn)行編譯的操作的,運行的效率會更高一些。

回到我們一開始的時候留下的問題,為什么別的跨平臺方案都是用 JavaScript,而 Flutter 要用 Dart 來開發(fā)。JavaScript 的編譯方式是 JIT 的,它不支持 AOT。而 Dart 同時支持 JIT 和 AOT。

Flutter 在開發(fā)階段使用 JIT,讓我們用上了熱重載,增加了開發(fā)效率。在打包時改用 AOT,保證了正式版應(yīng)用的性能。

最后講一下大家比較關(guān)心的一個東西,F(xiàn)lutter 是否支持熱更新?前面說到 Dart 支持 JIT,所以從技術(shù)層面它是支持的。但是目前是不支持的,在官方的計劃文檔中,可以看到:

至于原因,官方在這里進(jìn)行了說明。總的來說,是由于政策的限制,以及出于對性能和安全性的考慮,暫時不支持了。

到這就結(jié)束啦。由于想把 Flutter 基礎(chǔ)在一篇內(nèi)講完,沒有涉及太多細(xì)節(jié),如果要寫 Flutter 代碼還需要深入學(xué)習(xí)。但相信理解之后再學(xué),會輕松很多。

關(guān)于櫻花的唯美句子簡短英語

關(guān)于櫻花的唯美句子簡短英語

關(guān)于櫻花的唯美句子簡短英語,櫻花品種相當(dāng)繁多,數(shù)目超過三百種以上,櫻花并不是一種花,而是統(tǒng)稱, 櫻花是春天特有的浪漫,也是希望美好的象征。以下關(guān)于櫻花的唯美句子簡短英語。

關(guān)于櫻花的唯美句子簡短英語1

1、When you walk to the square, the cherry blossoms come in two colors: one is white and the other is red. It looks like a piece of flower sea, flower bud and leaf one to morning and put, think elder sister and younger sister, rush to come into this world. Look, flower bud is five one, like a string of sweet and sweet cherry on the branch.

2、The cherry blossoms are usually five petals, with long stamens in the center, and usually nine to ten flowers, like beautiful yellow bean sprouts. The unborn baby, like a balloon that is about to explode, looks lovely.

3、The mountain cherry and the cherry trees are not as white as peach blossoms, nor as green as pear flowers, they are lilies grey. It is full of red and red, almost the spring of the Beijing city of haitang. In addition, there is also a pale yellow turmeric, a low-hanging branch of the branches, the "spring equinox", the first flowering of the other side, petals to more than 300 pieces of chrysanthemum... The beauty of beauty.

4、The cherry blossoms were so white that they were red, with yellow flowers clustered in five petals. Like plum flower, tree trunk looks like peach tree trunks, leaves of various is spend less, is the green leaves foil flower, blossom but Ye Shaohua, a small branches have seven or eight flower, clusters of clusters, like floating in the blue sky white cloud, and like a snow ball on the trees, this is the foil flower leaves!

5、The contrast between the flowering cherry blossoms is very small, but in the same tree, you can also see the various forms of flowers. Some of them are budding, the flowers are different from the branches, and they seem to have an unspoken fear of the outside world. Some have just blossomed, like babys smiling face, sweet and pure, can not stand any wind and rain, but still lovable; The blossoming cherry blossoms, like a group of lively and lovely children, make up a rich and full happy paradise, and many generations live together. It is like a young girl standing tall and erect, but she is full of vitality and graceful.

6、Spring came, and the branches of the cherry trees were brightly colored. The flowers were small and small, and the five or six gathered together to form a flower ball, clustered in clusters on the branches, stretching the long, narrow petals and the flowers wrapped in them.

7、The varieties of sakura are different, its leaves are different, some are green and smooth, some are red and rough, others are green inside, but the edges are red... The sakura bark is dark brown, which is exactly the way it is decorated with pink cherry blossoms, but it doesnt seem to be able to hide its own qualities or qualities. The petals of the cherry blossom have three or five flowers each, which are in the form of umbrella-shaped inflorescences, which are carried out at the level of sepals, giving off a faint scent of flowers...

8、On both sides of the road are beautiful cherry blossoms. There are two varieties, one of which was opened in February, and the red cherry blossom of the double flaps, and we can see a little bit more sporadically. While the flowers are blooming with sweet pink blossoms, we often see them in the pictures. I stand under the tree and look at them carefully, looking at them as if they were the flowers. I dont know if peach blossoms are related to cherry blossoms, but they are as indistinguishable as twin sisters. Of course, as long as you observe carefully, you will find that their branches are different, and the peach tree trunks are darker and brighter. According to the introduction, there are more than 10,000 cherry trees here.

9、Springs favorite flower is cherry blossom. Often overnight, its open. Sudden, overwhelming. Then fall in the wind. There is no nostalgia. The Japanese call it flowers blowing snow. At dusk, walking through the cherry trees, the white petals are still fluttering. It suddenly occurred to me that this was the most extravagant flower. Because it dies early.

10、The cherry blossoms have blossomed into beautiful cherry blossoms, and they have blossomed into a beautiful and sad love. Love will eventually fall, which is the unchangeable fate of beautiful things. Good and short, like cherry blossoms.

11、The leaves of the cherry blossoms are water droplets, with tiny little pubescent hairs on the edges, and the leaves of the stem are glimmering, just when the green light is shining. The red flower needs a foil, which is true. Although it has always been a supporting role, it still brings a green meaning to people. The thick trunk was brown and the surface was waxy and smooth.

12、The cherry blossom is dark red, a bit like a single pink peach blossom, but the flower is smaller than peach blossom, and the flower shape is not as beautiful as peach blossom. I dont know whether I was bullied by the cold rain last night, and every flower was drooping, like the little girl who was angry.

13、Cherry blossoms, will be allergic to the spring season, open-minded heaven, smoothing out the blundering heart, be familiar with simple words said to people will understand, silly childish tomorrow, dancing like you hair, allow me to cherish not small rely on silent in uproar, want to meet spring flowers and plants leave will have new harvest, waiting for the spring the filar silk like subtle miracles will happen, I heard that day there is cloud in nestle, and found that the accumulation of change, faintly see the tail of a lion, believe think again beautiful also learn the scene ahead in the dawn of the garden Yang, I feel special, I understand you have a window, you will see the melting love, no plan no adventure, happy every day, a warm glow.

14、Looking at the cherry blossoms, they are very disappointed. The cherry blossom is dark red, a bit like a single pink peach blossom, but the flower is smaller than peach blossom, and the flower shape is not as beautiful as peach blossom. I dont know whether I was bullied by the cold rain last night, and every flower was bowed down, like a little girl in anger, more like a Japanese womans bow and a smile. I think this is the origin of the Japanese national flower, and may also be able to say why the Japanese women are so bent over a shallow smile.

15、I proud, never make public, I want to, but never say, I just like to see cherry blossoms flutter sinks down, quietly watching the clouds drift in the feet, see the wind blowing hair, I want to sleep in parents arms, in brother Xiao Sheng piano company, however, all this is nothing but just desire, they who also can not give, I can only be a person lonely wandering, like abandoned.

16、We do not have to admire her beauty, just to be able to quietly smell her fragrance, the thin ice, and enjoy the dreamlike cherry blossoms. I gently walked to a cherry tree, unable to resist the impulse of the heart, tiptoe, carefully folding a cherry tree, sitting on the lake on the lakeside stone bench, carefully studied. The petals of the petals of the petals are so that they are not vulgar, but the subtle aroma of the heart.

17、The teacher took us to the cherry garden, looking at the pink one, like a large pink cloud, floating, floating, tired, just stop there. Close look, pink petals and green leaves all the oval, the blossom in yellow white, is white, under the above is yellow, very small, like a touch will be broken, so we just cant touch. The flowers are blooming in all shapes and shapes; Some of them are half open, trying hard; Some of them, like the shy little girl, dare not to appear. But flowers or flowers, they are crowded, dense layers. And the charming fragrance, refreshing and refreshing.

18、Look at the peach blossom standing next to the cherry blossoms. They smiled at me and looked away, like the golden red sun shining in the sky. The peach blossom after the rain is so sweet, it makes one feel drunk with its fragrance. A good sentence: yingying lotus wind before falling, a piece of peach blossom rain after the jiao ah! These peach blossoms, you do not let me, I do not let you, there are clusters of, there is a single one, is really a thousand shapes, no wonder! Peach blossom is like apricot blossom, it is light red, they are fighting every day!

19、In the evening the rosy clouds dyed red window lattice, the evening breeze with a couple of YingHuaBan, children pick up petals, there took petals, gently toss up, cherry blossoms flying in the sky, like the beautiful butterflies, dancing in the bosom of nature. The childrens laughter and the breeze, drifting far, far away...

20、Remember the first time to see the cherry blossom, a spring rain like a date, the petals rain wind blowing. The flowering period is just over a week, so brief and so gorgeous.

21、The petals of sakura are from the edge to the center, from pale pink to pure white; Pink, like a babys innocent smile, white, like the worlds snow. I cant help but gently stroke it, soft as the silk of the jiangnan. The edges of the petals are microwaves, like microwaves on a pink ocean, and the real thing is the "waves" of flowers. The stems are slender and soft, as thin as a green silver thread, as soft as a girls fair figure, from top to bottom, from thick to thin, from brown to green, supporting delicate flowers.

22、Cherry blossoms are a natural reward, but they are also a spectacle. In the cherry blossom, even if it is not for the flowers, but also unconsciously do the flower.

23、Close to see, each cherry blossom tree is like a tall girl, the cherry blossom on the tree is the adornment of the girl head. The cherry blossoms are still water droplets: some are just open, fragile as if the touch will fall off; The others are in full bloom.

24、Goodbye the cherry blossoms, again in the rain. In that day, the rainy spring, floating and sprinkling, the luojiashan mountain also appears particularly vacant. In sakura, on sakura avenue, full of people holding umbrellas. But I am thin standing in the crowd outside, the mood like this rain of cherry blossoms, strangely calm and peaceful. Not so long ago. Always in such a moment, with a piece of rain, gliding through the edge of the cherry blossoms in the paths of my soul. Cherry blossoms are in the rain. The cherry blossoms in the rain, but when we are not casual, tranquility becomes a profound commemoration, yes, in the days of luojiashan, it is our luckiest time, the most pure desire.

25、When we go out, we have a thick spring. We "traveled through the mountains and rivers" and came to yuyuantan. As soon as you enter the door, there are countless petals fluttering in the air, flying in front of our eyes. Standing in the thick shade of trees, the feeling of weariness of the day seemed to vanish, and the breeze lifted my heavy mouth. Walking forward, there was open water. The golden sun was shining on the water, as if it had covered the smooth surface of the lake with gold.

26、Area has come to cafe DE jack cherry blossoms, maybe this time missed the cherry blossom the most splendid time, a lot of cherry blossoms fade, falling slope, steps on the flower piece, formed the strips trail was paved with flowers, people walk while watching the cherry blossom, also another scenery! Although there are a lot of flowers, but there are still a lot of cherry trees, still bright, they spread a beautiful smile, welcome guests.

27、The cherry blossom is a beautiful flower. Between open in the spring and summer, extremely beautiful flowers, the white petals slightly tinged pink, the golden flowers like gold in the clustered together, is so delicate that bursting lovely little face in the breeze, look lively.

28、Cherry blossoms are beautiful and beautiful. They are important ornamental plants for early spring. They are often used in garden viewing, and they can be planted in groups or in front of roadside buildings in hillside courtyards. Blooming time flowers are gorgeous, full of trees, like clouds, extremely spectacular. The landscape of flowers and sea can be planted in large areas, and the three or five clusters of trees can be planted in the green space to form a brocade, which can also be isolated to form a little red color among the green clusters. Cherry trees can also be used as path trees and hedges or bonsai. In addition, bark and fresh tender leaves can be used medicinally. Some people make jam and condiments in Japan by grinding the flowers of cherry blossoms into nectar.

29、Look, so many dye color cotton candy to float in the air, that is tall, the cherry blossom on the cherry trees, let people see the couldnt help thinking the school gate at the bound on the stick to sell cotton candy, really want to eat a few mouth snack; Come a little closer, the cherry blossoms are in clusters, clusters, more like a branch of melting ice cream; A little closer to see it, flying in the air, still white with pink, just like the snow in the winter makeup general beauty.

30、Beautiful cherry blossoms, white pink, in the breeze, sometimes embracing; Sometimes crooning; Now and then he lowers his head and whispers; Or head laughed, this beautiful scene, touches everyones nerves, they at the same time of ornamental, keep out of the cell phone camera take pictures, posing a variety of poss, leave this happy and beautiful scene good memories!

關(guān)于櫻花的唯美句子簡短英語2

1、關(guān)于櫻花的英語句子、段子、短文任意,有翻譯

In Japan cherry blossoms also symbolize clouds due to their nature of blooming en masse, besides being an enduring metaphor for the ephemeral nature of life, an aspect of Japanese cultural tradition that is often associated with Buddhistic influence, and which is embodied in the concept of mono no aware.

The association of the cherry blossom with mono no aware dates back to 18th-century scholar Motoori Norinaga. The transience of the blossoms, the extreme beauty and quick death, has often been associated with mortality; for this reason, cherry blossoms are richly symbolic, and have been utilized often in Japanese art, manga, anime, and film, as well as at musical performances for ambient effect. There is at least one popular folk song, originally meant for the shakuhachi (bamboo flute), titled "Sakura", and several pop songs. The flower is also represented on all manner of consumer goods in Japan, including kimono, stationery, and dishware.

在日本,櫻花也象征著云,由于其性質(zhì)盛開的集體,除了是一個持久的比喻為生命的短暫性質(zhì),一方面,日本的文化傳統(tǒng),往往是與佛教的影響,并體現(xiàn)在概念的單不知道。協(xié)會的'櫻花與單不知道可以追溯到18世紀(jì)的學(xué)者本居宣長。短暫的櫻花,極端的美和快速死亡,往往是相關(guān)的死亡率;為此,櫻花是豐富的象征,并已用于經(jīng)常在日本藝術(shù),漫畫,動畫,電影,以及在音樂表演對周圍環(huán)境的影響。至少有一個流行的民歌,原本是為了尺八,名為“櫻花”,和一些流行歌曲?;ㄒ泊硭邢M品的方式在日本,包括和服,文具,和餐具。

2、日本櫻花英文介紹,10句話就行

Prunus serrulata or Japanese Cherry; also called Hill Cherry, Oriental Cherry or East Asian Cherry, is a species of cherry native to Japan, Korea and China. It is known for its spring cherry blossom displays and festivals.Prunus serrulata is a small deciduous tree with a short single trunk, with a dense crown reaching a height of 8–12 metres (26–39 ft). The smooth bark is chestnut-brown, with prominent horizontal lenticels. The leaves are arranged alternately, simple, ovate-lanceolate, 5–13 cm long and 2.5–6.5 cm broad, with a short petiole and a serrate or doubly serrate margin. At the end of autumn, the green leaves turn yellow, red or crimson.。

3、Sometimes you need to look back, otherwise you will never know what you have lost in the way of forever searching.

偶爾要回頭看看,否則永遠(yuǎn)都在追尋,而不知道自己失去了什么. Miracles sometimes occur, but you have to work terribly for them.奇跡有時候是會發(fā)生的,但是你得為之拼命的努力。

關(guān)于櫻花的唯美句子簡短英語3

關(guān)于賞櫻花的說說

1、陽春三月,在溫暖的春風(fēng)里,看一場浪漫櫻花。

2、又是一年櫻花爛漫時,一起相約賞櫻花美,好的人和事總是特別短暫,要珍惜當(dāng)下。

3、粉色的櫻花,充滿著春天的精彩,洋溢著春天的熱鬧,散播著春天的朝氣。

4、如果櫻花常開 如果故人常在。

5、空氣新釀的清新,是櫻花味的。

6、神明把光風(fēng)交給霽月,把櫻花交給春天,把黑夜交給星光,把心跳交給臉紅,把你交給我。

7、櫻花盛開,花瓣徐徐吹落,如煙花般易逝,把剎那的芳華留存在人們心里。

8、櫻花已經(jīng)悄悄盛開,溫暖的春風(fēng)帶走了冬天的尾巴,為春天帶來活力。

9、陽光如此明媚、陪我賞櫻花可好……

10、櫻花和我,都想見你。

11、你看,城南的櫻花都開了,一切都會好起來的。

12、春天到了,櫻花樹的枝條上裹上一層斑斕的色彩。只見花朵小巧玲瓏,五六朵聚集在一起組成了一個花球,一簇一簇地?fù)頂D在枝頭上,舒展著狹長的花瓣和被包裹在其中的花蕊。

13、美麗的櫻花,開在初春三月里,想著這年年歲歲的真情實感就似這櫻花般的熱烈和赤誠。

14、櫻之夭夭,灼灼其華,四季初始,花信已至,春日的天光落于街邊的櫻花樹,是今年春季的粉色限定,櫻花櫻花,我想在溫柔的春日見你。

15、在櫻花樹下慢走,枝頭的櫻花燦燦的綻放,一枝枝,一朵朵,簇著擁著,如云朵般,輕柔、素雅,醉在了這最美的花季,繁雜的心也終于安靜下來。

16、櫻花開了,那粉嫩的花瓣隨著輕風(fēng)慢慢的抖動,清香隨著微風(fēng)輕輕的灑滿了整個院子,讓人神清氣爽。

17、一陣微風(fēng)輕拂而起,帶來了遠(yuǎn)方不知名的醉人花香,卻也將樹枝上的櫻花帶離枝頭,無數(shù)的櫻花瓣在風(fēng)中翩然起舞,像是粉色的輕紗隨風(fēng)浮動,令人不禁懷疑自己是在夢中。

Flutter Button(按鈕)

在 Flutter 里有很多的 Button,包括了:MaterialButton、RaisedButton、FloatingActionButton、FlatButton、IconButton、ButtonBar、DropdownButton 等。

一般常用的 Button 是 MaterialButton、IconButton、FloatingActionButton。

MaterialButton 是一個 Materia 風(fēng)格的按鈕。

一般來說,如果需要點擊事件,就要嵌套一個 Button,因為 Container、Text 等組件都沒有點擊事件。

RaisedButton 與 MaterialButton 類似。

FlatButton 與 MaterialButton 類似,不同的是它是透明背景的。如果一個 Container 想要點擊事件時,可以使用 FlatButton 包裹,而不是 MaterialButton。因為 MaterialButton 默認(rèn)帶背景,而 FlatButton 默認(rèn)不帶背景。

IconButton 顧名思義就是 Icon + Button 的復(fù)合體,當(dāng)某個 Icon 需要點擊事件時,使用 IconButton 最好不過。

其外,還有已經(jīng)定義好的 Icon Button:CloseButton、BackButton。他們都有導(dǎo)航返回的能力。

FloatingActionButton 是一個浮動在頁面右下角的浮動按鈕。

在 Scaffold 里使用的時候,它是一個浮動狀態(tài)的按鈕,在其他地方使用,就不會浮動了。

ButtonBar 是一個布局組件,可以讓 Button 排列在一行。

flutter怎么把一個outlinebutton按鈕放在底部

我要做的是用BottomNavigationBarItem移除/替換FAB(浮動操作按鈕),并將其放在BottomNavigationBar的中心,并為其創(chuàng)建樣式。

為了按鈕能夠根據(jù)屏幕寬度進(jìn)行延伸變寬,用了row和expanded,expanded多大面積,按鈕就有多大面積。如果不用row,expanded會向下延伸,就不是我們要的效果了。

OutlineButton控件的child和onPressed是必須的屬性,borderSide用來自定義邊框顏色和樣式。

Flutter 之 Sliver 系列控件

SliverAppBar 控件,一個 MD 的 AppBar 。屬性和 AppBar 類似,但做的效果比 AppBar 更加強(qiáng)大。相同的屬性具體可以看 Flutter 之 Scaffold 控件 , 里面有 AppBar 控件的介紹。那么還有些沒有的屬性:

結(jié)合 elevation 使用,當(dāng)elevation 不為 0 的時候,是否顯示陰影

AppBar 展開時候的高度

true 的時候下滑AppBar優(yōu)先滑動展示,展示完成后才給滑動控件滑動

snap 為 true, 則 floating 也要為 true 。true 的時候根據(jù)手指松開的位置展開或者收縮AppBar

appBar 收縮到最小高度的時候 appBar 是否可見

SliverAppBar 往往做為 CustomScrollView 的第一個子元素,根據(jù)滾動控件的偏移量或者浮動的位置來改變 SliverAppBar 的高度。所以具體用法如下

另外在上面設(shè)計到 FlexibleSpaceBar 控件,F(xiàn)lexibleSpaceBar 有個 collapseMode 屬性

為 Sliver 系列控件添加一個 padding 。如給上面 SliverAppBar 添加一個 Padding 。

多行多列的列表控件,相當(dāng)于 Android 的 GridView,有兩個屬性

SliverChildDelegate,這里有兩種方式創(chuàng)建

SliverGridDelegate,也是有兩種方式創(chuàng)建

結(jié)合上面展示效果

和上面 delegate 屬性一樣,需要創(chuàng)建一個 SliverChildDelegate 。

比 SliverList 多一個 itemExtent 屬性,設(shè)置 item 的高度 。item 里面的子控件無法再改動高度。

上面 SliverAppBar 就是結(jié)合 SliverPersistentHeader 實現(xiàn)的效果,SliverPersistentHeader 需要一個 SliverPersistentHeaderDelegate 。 實現(xiàn) SliverPersistentHeaderDelegate 有 4 個方法需要重寫

至于效果,具體效果具體分析。

有一個 Widget 屬性,主要作用是在 CustomScrollView 里面添加多種不同布局的樣式。

占滿一屏或者比一屏更多的布局,

滑動剩余部分展示的布局


網(wǎng)頁名稱:flutter浮動,flutter浮動組件
當(dāng)前地址:http://weahome.cn/article/dsdooij.html

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