fix: reveal dialogs on Android P (#1196)

Create a new fullscreen InputView to contain the keyboard views, just like a canvas to let all things show on it.

app/src/main/java/com/osfans/trime/ime/core/InputView.kt

@@ -0,0 +1,91 @@
+package com.osfans.trime.ime.core
+
+import android.annotation.SuppressLint
+import android.app.Dialog
+import android.view.LayoutInflater
+import android.view.View
+import android.view.WindowManager
+import androidx.constraintlayout.widget.ConstraintLayout
+import com.osfans.trime.R
+import com.osfans.trime.databinding.MainInputLayoutBinding
+import com.osfans.trime.databinding.SymbolInputLayoutBinding
+import com.osfans.trime.util.styledFloat
+import splitties.views.dsl.constraintlayout.bottomOfParent
+import splitties.views.dsl.constraintlayout.centerHorizontally
+import splitties.views.dsl.constraintlayout.constraintLayout
+import splitties.views.dsl.constraintlayout.lParams
+import splitties.views.dsl.core.add
+import splitties.views.dsl.core.matchParent
+import splitties.views.dsl.core.withTheme
+import splitties.views.dsl.core.wrapContent
+
+/**
+ * Successor of the old InputRoot
+ */
+@SuppressLint("ViewConstructor")
+class InputView(
+    val service: Trime,
+) : ConstraintLayout(service) {
+    private val themedContext = context.withTheme(android.R.style.Theme_DeviceDefault_Settings)
+
+    val oldMainInputView = MainInputLayoutBinding.inflate(LayoutInflater.from(context))
+    val oldSymbolInputView = SymbolInputLayoutBinding.inflate(LayoutInflater.from(context))
+
+    val keyboardView: View
+
+    init {
+        keyboardView =
+            constraintLayout {
+                isMotionEventSplittingEnabled = true
+                add(
+                    oldMainInputView.root,
+                    lParams(matchParent, wrapContent) {
+                        centerHorizontally()
+                        bottomOfParent()
+                    },
+                )
+                add(
+                    oldSymbolInputView.root,
+                    lParams(matchParent, wrapContent) {
+                        centerHorizontally()
+                        bottomOfParent()
+                    },
+                )
+            }
+
+        add(
+            keyboardView,
+            lParams(matchParent, wrapContent) {
+                centerHorizontally()
+                bottomOfParent()
+            },
+        )
+    }
+
+    private var showingDialog: Dialog? = null
+
+    fun showDialog(dialog: Dialog) {
+        showingDialog?.dismiss()
+        val windowToken = windowToken
+        check(windowToken != null) { "InputView Token is null." }
+        val window = dialog.window!!
+        window.attributes.apply {
+            token = windowToken
+            type = WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG
+        }
+        window.addFlags(
+            WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM or
+                WindowManager.LayoutParams.FLAG_DIM_BEHIND,
+        )
+        window.setDimAmount(themedContext.styledFloat(android.R.attr.backgroundDimAmount))
+        showingDialog =
+            dialog.apply {
+                setOnDismissListener { this@InputView.showingDialog = null }
+                show()
+            }
+    }
+
+    fun finishInput() {
+        showingDialog?.dismiss()
+    }
+}