Adjust SearchToolbar soft keyboard behavior (#9282)

* Show soft keyboard when the text field is composed (a redo)
* Clear focus on text field when soft keyboard is hidden
* Request focus on text field and show soft keyboard
when clear button is clicked

(cherry picked from commit 7a1b599462498f6be8faf08cbd2814a04863f3ef)

presentation-core/src/main/java/tachiyomi/presentation/core/util/Modifier.kt

@@ -4,14 +4,25 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.isImeVisible
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.composed
 import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.onFocusChanged
 import androidx.compose.ui.input.key.Key
 import androidx.compose.ui.input.key.key
 import androidx.compose.ui.input.key.onPreviewKeyEvent
+import androidx.compose.ui.platform.LocalFocusManager
 import tachiyomi.presentation.core.components.material.SecondaryItemAlpha
 
 fun Modifier.selectedBackground(isSelected: Boolean): Modifier = composed {
@@ -52,3 +63,53 @@ fun Modifier.runOnEnterKeyPressed(action: () -> Unit): Modifier = this.onPreview
         else -> false
     }
 }
+
+/**
+ * For TextField on AppBar, this modifier will request focus
+ * to the element the first time it's composed.
+ */
+fun Modifier.showSoftKeyboard(show: Boolean): Modifier = if (show) {
+    composed {
+        val focusRequester = remember { FocusRequester() }
+        var openKeyboard by rememberSaveable { mutableStateOf(show) }
+        LaunchedEffect(focusRequester) {
+            if (openKeyboard) {
+                focusRequester.requestFocus()
+                openKeyboard = false
+            }
+        }
+
+        Modifier.focusRequester(focusRequester)
+    }
+} else {
+    this
+}
+
+/**
+ * For TextField, this modifier will clear focus when soft
+ * keyboard is hidden.
+ */
+fun Modifier.clearFocusOnSoftKeyboardHide(): Modifier = composed {
+    var isFocused by remember { mutableStateOf(false) }
+    var keyboardShowedSinceFocused by remember { mutableStateOf(false) }
+    if (isFocused) {
+        val imeVisible = WindowInsets.isImeVisible
+        val focusManager = LocalFocusManager.current
+        LaunchedEffect(imeVisible) {
+            if (imeVisible) {
+                keyboardShowedSinceFocused = true
+            } else if (keyboardShowedSinceFocused) {
+                focusManager.clearFocus()
+            }
+        }
+    }
+
+    Modifier.onFocusChanged {
+        if (isFocused != it.isFocused) {
+            if (isFocused) {
+                keyboardShowedSinceFocused = false
+            }
+            isFocused = it.isFocused
+        }
+    }
+}