design : updates TextField api

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/theme/components/TextField2.kt

@@ -23,13 +23,17 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.text.KeyboardActions
 import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material3.LocalContentColor
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.ui.text.TextLayoutResult
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.input.VisualTransformation
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
@@ -63,18 +67,16 @@ fun TextField2(
     keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
     keyboardActions: KeyboardActions = KeyboardActions.Default,
     visualTransformation: VisualTransformation = VisualTransformation.None,
+    interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
     onTextLayout: (TextLayoutResult) -> Unit = {},
     modifier: Modifier = Modifier
 ) {
-    val interactionSource = remember { MutableInteractionSource() }
     val isFocused by interactionSource.collectIsFocusedAsState()
     BasicTextField(
         value = value,
         onValueChange = onValueChange,
         modifier = modifier,
-        textStyle = ElementTheme.typography.fontBodyLgRegular.copy(
-            color = if (readOnly) ElementTheme.colors.textSecondary else ElementTheme.colors.textPrimary
-        ),
+        textStyle = textFieldStyle(enabled),
         interactionSource = interactionSource,
         enabled = enabled,
         singleLine = singleLine,
@@ -87,77 +89,202 @@ fun TextField2(
         visualTransformation = visualTransformation,
         onTextLayout = onTextLayout,
     ) { innerTextField ->
-        Column {
-            if (label != null) {
-                Text(
-                    text = label,
-                    color = ElementTheme.colors.textPrimary,
-                    style = ElementTheme.typography.fontBodyMdRegular,
-                )
-            }
+        DecorationBox(
+            label = label,
+            readOnly = readOnly,
+            enabled = enabled,
+            isFocused = isFocused,
+            isError = isError,
+            leadingIcon = leadingIcon,
+            placeholder = placeholder,
+            isTextEmpty = value.isEmpty(),
+            innerTextField = innerTextField,
+            trailingIcon = trailingIcon,
+            supportingText = supportingText
+        )
+    }
+}
+
+@Composable
+fun TextField2(
+    value: TextFieldValue,
+    onValueChange: (TextFieldValue) -> Unit,
+    label: String? = null,
+    supportingText: String? = null,
+    placeholder: String? = null,
+    leadingIcon: @Composable (() -> Unit)? = null,
+    trailingIcon: @Composable (() -> Unit)? = null,
+    isError: Boolean = false,
+    enabled: Boolean = true,
+    readOnly: Boolean = false,
+    singleLine: Boolean = false,
+    maxLines: Int = if (singleLine) 1 else Int.MAX_VALUE,
+    minLines: Int = 1,
+    keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
+    keyboardActions: KeyboardActions = KeyboardActions.Default,
+    visualTransformation: VisualTransformation = VisualTransformation.None,
+    interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
+    onTextLayout: (TextLayoutResult) -> Unit = {},
+    modifier: Modifier = Modifier
+) {
+    val isFocused by interactionSource.collectIsFocusedAsState()
+    BasicTextField(
+        value = value,
+        onValueChange = onValueChange,
+        modifier = modifier,
+        textStyle = textFieldStyle(enabled),
+        interactionSource = interactionSource,
+        enabled = enabled,
+        singleLine = singleLine,
+        maxLines = maxLines,
+        minLines = minLines,
+        readOnly = readOnly,
+        cursorBrush = SolidColor(ElementTheme.colors.textPrimary),
+        keyboardOptions = keyboardOptions,
+        keyboardActions = keyboardActions,
+        visualTransformation = visualTransformation,
+        onTextLayout = onTextLayout,
+    ) { innerTextField ->
+        DecorationBox(
+            label = label,
+            readOnly = readOnly,
+            enabled = enabled,
+            isFocused = isFocused,
+            isError = isError,
+            leadingIcon = leadingIcon,
+            placeholder = placeholder,
+            isTextEmpty = value.text.isEmpty(),
+            innerTextField = innerTextField,
+            trailingIcon = trailingIcon,
+            supportingText = supportingText
+        )
+    }
+}
+
+
+@Composable
+private fun DecorationBox(
+    label: String?,
+    enabled: Boolean,
+    readOnly: Boolean,
+    isFocused: Boolean,
+    isError: Boolean,
+    placeholder: String?,
+    isTextEmpty: Boolean,
+    supportingText: String?,
+    leadingIcon: @Composable (() -> Unit)?,
+    trailingIcon: @Composable (() -> Unit)?,
+    innerTextField: @Composable () -> Unit,
+) {
+    Column {
+        if (label != null) {
+            Text(
+                text = label,
+                color = ElementTheme.colors.textPrimary,
+                style = ElementTheme.typography.fontBodyMdRegular,
+            )
             Spacer(modifier = Modifier.height(8.dp))
-            Surface(
-                shape = RoundedCornerShape(4.dp),
-                border = if (readOnly) {
-                    null
-                } else {
-                    BorderStroke(
-                        width = if (isFocused) 2.dp else 1.dp,
-                        color = when {
-                            isError -> ElementTheme.colors.borderCriticalPrimary
-                            isFocused -> ElementTheme.colors.borderInteractiveHovered
-                            else -> ElementTheme.colors.borderInteractiveSecondary
-                        }
-                    )
-                },
-                color = if (readOnly) ElementTheme.colors.bgSubtleSecondary else ElementTheme.colors.bgCanvasDefault,
-            ) {
-                Row(modifier = Modifier.padding(16.dp)) {
-                    if (leadingIcon != null) {
+        }
+        TextFieldContainer(
+            enabled = enabled,
+            readOnly = readOnly,
+            isFocused = isFocused,
+            isError = isError
+        ) {
+            Row(modifier = Modifier.padding(16.dp)) {
+                if (leadingIcon != null) {
+                    CompositionLocalProvider(LocalContentColor provides ElementTheme.colors.iconSecondary) {
                         leadingIcon()
-                        Spacer(modifier = Modifier.width(8.dp))
                     }
-                    Box(modifier = Modifier.weight(1f)) {
-                        if (placeholder != null && value.isEmpty()) {
-                            Text(
-                                text = placeholder,
-                                color = ElementTheme.colors.textPlaceholder,
-                                style = ElementTheme.typography.fontBodyLgRegular,
-                            )
-                        }
-                        innerTextField()
+                    Spacer(modifier = Modifier.width(8.dp))
+                }
+                Box(modifier = Modifier.weight(1f)) {
+                    if (placeholder != null && isTextEmpty) {
+                        Text(
+                            text = placeholder,
+                            color = ElementTheme.colors.textPlaceholder,
+                            style = ElementTheme.typography.fontBodyLgRegular,
+                        )
                     }
-                    if (trailingIcon != null) {
-                        Spacer(modifier = Modifier.width(8.dp))
+                    innerTextField()
+                }
+                if (trailingIcon != null) {
+                    Spacer(modifier = Modifier.width(8.dp))
+                    CompositionLocalProvider(LocalContentColor provides ElementTheme.colors.iconSecondary) {
                         trailingIcon()
                     }
                 }
             }
-            if (supportingText != null) {
-                Spacer(modifier = Modifier.height(4.dp))
-                Row(
-                    verticalAlignment = Alignment.CenterVertically,
-                    horizontalArrangement = spacedBy(4.dp),
-                ) {
-                    if (isError) {
-                        Icon(
-                            imageVector = CompoundIcons.Error(),
-                            contentDescription = null,
-                            modifier = Modifier.size(16.dp),
-                            tint = ElementTheme.colors.iconCriticalPrimary
-                        )
-                    }
-                    Text(
-                        text = supportingText,
-                        color = if (isError) ElementTheme.colors.textCriticalPrimary else ElementTheme.colors.textSecondary,
-                        style = ElementTheme.typography.fontBodySmRegular,
-                    )
-                }
-            }
+        }
+        if (supportingText != null) {
+            Spacer(modifier = Modifier.height(4.dp))
+            SupportingTextLayout(isError, supportingText)
         }
     }
 }
 
+@Composable
+private fun TextFieldContainer(
+    enabled: Boolean,
+    readOnly: Boolean,
+    isFocused: Boolean,
+    isError: Boolean,
+    content: @Composable () -> Unit
+) {
+    Surface(
+        shape = RoundedCornerShape(4.dp),
+        border = if (readOnly) {
+            null
+        } else {
+            BorderStroke(
+                width = if (isFocused) 2.dp else 1.dp,
+                color = when {
+                    !enabled -> ElementTheme.colors.borderDisabled
+                    isError -> ElementTheme.colors.borderCriticalPrimary
+                    isFocused -> ElementTheme.colors.borderInteractiveHovered
+                    else -> ElementTheme.colors.borderInteractiveSecondary
+                }
+            )
+        },
+        color = when {
+            readOnly -> ElementTheme.colors.bgSubtleSecondary
+            !enabled -> ElementTheme.colors.bgCanvasDisabled
+            else -> ElementTheme.colors.bgCanvasDefault
+        },
+        content = content
+    )
+}
+
+@Composable
+private fun SupportingTextLayout(isError: Boolean, supportingText: String) {
+    Row(horizontalArrangement = spacedBy(4.dp)) {
+        if (isError) {
+            Icon(
+                imageVector = CompoundIcons.Error(),
+                contentDescription = null,
+                modifier = Modifier.size(16.dp),
+                tint = ElementTheme.colors.iconCriticalPrimary
+            )
+        }
+        Text(
+            text = supportingText,
+            color = if (isError) ElementTheme.colors.textCriticalPrimary else ElementTheme.colors.textSecondary,
+            style = ElementTheme.typography.fontBodySmRegular,
+        )
+    }
+}
+
+@Composable
+private fun textFieldStyle(enabled: Boolean): TextStyle {
+    return ElementTheme.typography.fontBodyLgRegular.copy(
+        color = if (enabled) {
+            ElementTheme.colors.textPrimary
+        } else {
+            ElementTheme.colors.textSecondary
+        }
+    )
+}
+
 @Preview(group = PreviewGroup.TextFields)
 @Composable
 internal fun TextFields2LightPreview() = ElementPreviewLight { ContentToPreview() }