Kotlin jetpack compose 文本输入框ExitText/TextField remember 居然可以传两个参数

Posted 2022-06-22 安果移不动

package com.anguomob.jecpack.activity.compose.todo.one

import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.material.*
import androidx.compose.material.SnackbarDefaults.backgroundColor
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.alpha
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import androidx.databinding.adapters.TextViewBindingAdapter
import com.anguomob.jecpack.activity.compose.todo.bean.TodoItem

@Composable
fun TodoInputText(text: String, onTextChanged: (String) -> Unit, modifier: Modifier = Modifier) 
    TextField(
        value = text,
        onValueChange = onTextChanged,
        modifier = modifier,
        colors = TextFieldDefaults.textFieldColors(backgroundColor = Color.Transparent),
        maxLines = 1,
    )


@Composable()
fun TodoEditButton(
    onClick: () -> Unit,
    text: String,
    modifier: Modifier = Modifier,
    enable: Boolean = true
) 
    TextButton(
        onClick = onClick,
        shape = CircleShape,
        colors = ButtonDefaults.buttonColors(),
        modifier = modifier,
        enabled = enable
    ) 
        Text(text)
    


@Composable
fun TodoItemInput(onItemComplete: (TodoItem) -> Unit) 
    val (text, setText) = remember 
        mutableStateOf("")
    
    Column 
        Row(
            Modifier
                .padding(horizontal = 16.dp)
                .padding(top = 16.dp)
        ) 

            TodoInputText(
                text = text,
                modifier = Modifier
                    .weight(1f)
                    .padding(end = 8.dp),
                onTextChanged = setText

            )
            TodoEditButton(
                onClick = 
                    onItemComplete(TodoItem(text))
                    setText("")
                ,
                text = "Add",
                modifier = Modifier.align(Alignment.CenterVertically),
                enable = !text.isBlank()
            )

        
    

使用

open class ComposeActivity : ComponentActivity() 
    val todoViewModel: TodoViewModel by viewModels()
    private val TAG = "ComposeActivity"
    override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        setContent 
//            TodoActivityScreen(todoViewModel)
            TodoItemInput(
                Log.e(TAG, "onCreate: $it.task")
            )
        
    

效果