weiV(发音同 wave)
https://github.com/hackware1993/weiV
if ("weiV" == "View".reversed()) {
Log.d(
"weiV",
"它意味着控制反转,你始终应该直接操作 UI 的描述 Widget 而不是直接操作 View。"
)
}
它具有以下优势:
- 声明式的 UI 写法让原生开发效率翻倍
- 达到或超越 View 系统的性能
- 我将我的 Flutter ConstraintLayout 移植到 Android,依托它先进的布局算法,在不引入固有特性测量的情况下,让 View 树中的子元素在任何情况都只会被
layout 一次,使得任意嵌套不会引起性能问题。即便 View 树中的每个层级宽高都是 wrap_content 和 match_parent 混用 - xml 将被抛弃
- 我将我的 Flutter ConstraintLayout 移植到 Android,依托它先进的布局算法,在不引入固有特性测量的情况下,让 View 树中的子元素在任何情况都只会被
- 你所有的现有 View 系统的经验都将得到保留
- 所有的现有 UI 组件都将得以复用
- 它使用 Kotlin 编写,但友好的支持 Java
- 目前已经开始初步支持实时生效的动态化。你可以下发 JS,使用 JS 来写页面逻辑,并生成描述 Widget 树的 JSON 传递给原生,原生使用非反射的方式将其转为真正的 Widget
树并渲染。后面可能会考虑在 JS 中实现声明式 API
没有人愿意推翻自己过去在 View 系统的经验,Compose 的设计太过糟糕。
进展
目前完成了 DSL 的定义,可以解析成 Widget 树了,DSL 风格如下:
Kotlin 风格:
class WeiVCounterKotlinActivity : WeiVActivity() {
private var count = 0
private val maxCount = 10
private val minCount = 0
override fun build() = WeiV {
Flex {
it.orientation = FlexDirection.VERTICAL
Button(text = "Add count", enable = count < maxCount, onClick = {
setState {
count++
}
})
Button(text = "Sub count", enable = count > minCount, onClick = {
setState {
count--
}
})
Text(text = "count = $count")
}
}
}
Java 风格:
public class WeiVCounterJavaActivity extends BaseWeiVJavaActivity {
private int count = 0;
private int maxCount = 10;
private int minCount = 0;
@Override
public WeiV build() {
return WeiV(() -> {
Flex((it) -> {
it.wOrientation(FlexDirection.VERTICAL);
Button().wText("Add count").wEnable(count < maxCount).wOnClick(v -> {
setState(() -> {
count++;
});
});
Button().wText("Sub count").wEnable(count > minCount).wOnClick(v -> {
setState(() -> {
count--;
});
});
Text().wText("count = " + count);
});
});
}
}
weiV 是可扩展的。它会内置所有常用的 Widget,这些 Widget 都是对系统 View 的包装。但对于第三方库,就需要写扩展,写起来也极其简单,比如给 Button 的扩展如下:
class weiVButton @JvmOverloads constructor(
key: Key? = null,
layoutParam: LayoutParam<*>? = null,
var text: String = "",
var textSize: Float = TextConst.defaultTextSize,
var textColor: Int = TextConst.defaultTextColor,
var onClick: View.OnClickListener? = null,
var enable: Boolean = true
) :
LeafRenderWidget<Button, weiVButton>(key, layoutParam), IWeiVExtension,
ISerializableWidget<weiVButton> {
override fun createView(context: Context): Button = Button(context)
override fun doParameter(view: Button, first: Boolean): Button {
if (view.text != text) {
view.text = text
}
if (view.currentTextColor != textColor) {
view.setTextColor(textColor)
}
if (view.textSize != textSize) {
view.textSize = textSize
}
view.setOnClickListener(onClick)
if (view.isEnabled != enable) {
view.isEnabled = enable
}
return view
}
@JavaOnly
fun wText(text: String): weiVButton {
this.text = text
return this
}
@JavaOnly
fun wTextSize(textSize: Float): weiVButton {
this.textSize = textSize
return this
}
@JavaOnly
fun wTextColor(textColor: Int): weiVButton {
this.textColor = textColor
return this
}
@JavaOnly
fun wOnClick(onClick: View.OnClickListener?): weiVButton {
this.onClick = onClick
return this
}
@JavaOnly
fun wEnable(enable: Boolean): weiVButton {
this.enable = enable
return this
}
override fun fromJson(jsonObj: JSONObject, param: Map<String, Any?>): weiVButton {
text = (param["text"] as String?) ?: ""
textSize = ((param["textSize"] as Double?) ?: TextConst.defaultTextSize).toFloat()
val colorStr = param["textColor"] as String?
textColor = if (colorStr != null && colorStr.startsWith("#")) {
Color.parseColor(colorStr)
} else {
TextConst.defaultTextColor
}
return this
}
override fun toString(): String {
return "weiVButton(text='$text', textSize=$textSize, textColor=$textColor, enable=$enable)"
}
}
@KotlinOnly
fun WeiV.Button(
key: Key? = null,
layoutParam: LayoutParam<*>? = null,
text: String = "",
textSize: Float = TextConst.defaultTextSize,
textColor: Int = TextConst.defaultTextColor,
onClick: View.OnClickListener? = null,
enable: Boolean = true
): weiVButton {
return addLeafRenderWidget(
weiVButton(
key = key,
layoutParam = layoutParam,
text = text,
textSize = textSize,
textColor = textColor,
onClick = onClick,
enable = enable
)
)
}
weiV 基于 View 系统,因此它可以嵌入到 View 树的任何地方。你可以在 weiV 中嵌入 Compose、Flutter,也可以在 Compose、Flutter 里嵌入 weiV。推荐在 Compose 顶层嵌入 weiV 以改善 Compose 的性能。😀
预计很快 weiV 就可以真正跑起来了。但还任重而道远。首先需要移植 Flutter ConstraintLayout,其次大概率会重写一个 weiV 版本的 RecyclerView,以支持像 Flutter 那样简单的列表用法,不需要写 Adapter。
订阅我的微信公众号(FlutterFirst)以及时获取 weiV 的最新动态。后续也会分享一些高质量的、独特的、有思想的 Flutter 和 Android 技术文章。
https://github.com/hackware1993/weiV
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联系方式
协议
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