(八)动态模板-流程设计

动态绑定XML的逻辑已经完成了,接下来就是拆分整合各模块,实现渲染流程的每一个环节。
具体的渲染逻辑如下:

「由于antlr编译支持库很大,所以这里设计了一个中间语言IR,以减小在Native上的引擎大小。」
原始测试XML如下:

<?xml version="1.0"?>
<View flexDirection="row" width="300" height="auto"
    maxHeight="1000"
    left="20"
    top="50"
    justify="spaceAround"
    alignItems="stretch"
    paddingTop="10"
    paddingBottom="20"
    paddingLeft="15"
    paddingRight="15"
    backgroundColor="#FFCDB2">
    <View flex="2" height="auto" justify="center" alignItems="center" backgroundColor="#B5838D">
        <View width="{{ 50 / 2 + 10 }}"
            height="{{ 59 + 2.5 *2 -3 }}"
            backgroundColor="#6D6875"
            borderColor="#e63946"
            borderWidth="2"
            shadowColor="#d00000"
            shadowRadius="15"
            shadowOpacity="0.5"
            ></View>
    </View>
    <View flex="2" height="200" backgroundColor="#90B36D" justify="start" alignItems="center">
        <Label text="for测试: {{item[name]}} - {{ item[age] }}" fontSize="20" color="#ffd23f" for="{{ for item in items }}"></Label>
        <Label text="测试标题2测试标题2测试标题2"
            fontSize="20"
            color="#ef233c"
            marginTop="10"
            lineNumber="3"
            backgroundColor="#00ff00"></Label>
    </View>
</View>

通过模板编辑器(目前只实现了功能,没有实际意义上的编辑器工具)将表达式部分编译成IR,代码如下:

<?xml version="1.0"?>
<View flexDirection="row" width="300" height="auto" maxHeight="1000" left="20" top="50" justify="spaceAround" alignItems="stretch" paddingTop="10" paddingBottom="20" paddingLeft="15" paddingRight="15" backgroundColor="#FFCDB2">
    <View flex="1" height="auto" justify="center" alignItems="center" backgroundColor="#B5838D">
        <View width="{{W3siTGVmdCI6IHsiTGVmdCI6IHsiU3ViVHlwZSI6ICJJbnQiLCAiVHlwZSI6ICJQcmltYXJ5IiwgIlZhbHVlIjogIjUwIn0sICJPUCI6ICIvIiwgIlJpZ2h0IjogeyJTdWJUeXBlIjogIkludCIsICJUeXBlIjogIlByaW1hcnkiLCAiVmFsdWUiOiAiMiJ9LCAiVHlwZSI6ICJCaW5hcnkifSwgIk9QIjogIisiLCAiUmlnaHQiOiB7IlN1YlR5cGUiOiAiSW50IiwgIlR5cGUiOiAiUHJpbWFyeSIsICJWYWx1ZSI6ICIxMCJ9LCAiVHlwZSI6ICJCaW5hcnkifV0=}}" height="{{W3siTGVmdCI6IHsiTGVmdCI6IHsiU3ViVHlwZSI6ICJJbnQiLCAiVHlwZSI6ICJQcmltYXJ5IiwgIlZhbHVlIjogIjU5In0sICJPUCI6ICIrIiwgIlJpZ2h0IjogeyJMZWZ0IjogeyJTdWJUeXBlIjogIkRvdWJsZSIsICJUeXBlIjogIlByaW1hcnkiLCAiVmFsdWUiOiAiMi41In0sICJPUCI6ICIqIiwgIlJpZ2h0IjogeyJTdWJUeXBlIjogIkludCIsICJUeXBlIjogIlByaW1hcnkiLCAiVmFsdWUiOiAiMiJ9LCAiVHlwZSI6ICJCaW5hcnkifSwgIlR5cGUiOiAiQmluYXJ5In0sICJPUCI6ICItIiwgIlJpZ2h0IjogeyJTdWJUeXBlIjogIkludCIsICJUeXBlIjogIlByaW1hcnkiLCAiVmFsdWUiOiAiMyJ9LCAiVHlwZSI6ICJCaW5hcnkifV0=}}" backgroundColor="#6D6875" borderColor="#e63946" borderWidth="2" shadowColor="#d00000" shadowRadius="15" shadowOpacity="0.5"/>
    </View>
    <View flex="2" height="200" backgroundColor="#90B36D" justify="start" alignItems="center">
        <Label text="for测试: {{W3siS2V5IjogIm5hbWUiLCAiTm9kZSI6IHsiU3ViVHlwZSI6ICJJRCIsICJUeXBlIjogIlByaW1hcnkiLCAiVmFsdWUiOiAiaXRlbSJ9LCAiVHlwZSI6ICJFdmFsIn1d}} - {{W3siS2V5IjogImFnZSIsICJOb2RlIjogeyJTdWJUeXBlIjogIklEIiwgIlR5cGUiOiAiUHJpbWFyeSIsICJWYWx1ZSI6ICJpdGVtIn0sICJUeXBlIjogIkV2YWwifV0=}}" fontSize="20" color="#ffd23f" for="{{eyJBcnJheU5hbWUiOiAiaXRlbXMiLCAiSXRlbUtleSI6ICJpdGVtIiwgIlR5cGUiOiAiRm9yIn0=}}"/>
        <Label text="测试标题2测试标题2测试标题2" fontSize="20" color="#ef233c" marginTop="10" lineNumber="3" backgroundColor="#00ff00"/>
    </View>
</View>