Add some widgets

app/src/main/java/org/koitharu/kotatsu/search/ui/widget/SearchBehavior.kt

@@ -0,0 +1,54 @@
+package org.koitharu.kotatsu.search.ui.widget
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import android.widget.LinearLayout
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.view.ViewCompat
+import com.google.android.material.appbar.AppBarLayout
+import com.google.android.material.bottomnavigation.BottomNavigationView
+
+class SearchBehavior(context: Context?, attrs: AttributeSet?) :
+	CoordinatorLayout.Behavior<SearchToolbar>(context, attrs) {
+
+	override fun layoutDependsOn(
+		parent: CoordinatorLayout,
+		child: SearchToolbar,
+		dependency: View,
+	): Boolean {
+		return if (dependency is AppBarLayout) {
+			true
+		} else
+			if (dependency is LinearLayout || dependency is BottomNavigationView) {
+				dependency.z = child.z + 1
+				true
+			} else {
+				super.layoutDependsOn(parent, child, dependency)
+			}
+	}
+
+	override fun onDependentViewChanged(
+		parent: CoordinatorLayout,
+		child: SearchToolbar,
+		dependency: View,
+	): Boolean {
+		if (dependency is AppBarLayout) {
+			child.translationY = dependency.getY()
+			return true
+		}
+		return super.onDependentViewChanged(parent, child, dependency)
+	}
+
+	override fun onStartNestedScroll(
+		coordinatorLayout: CoordinatorLayout,
+		child: SearchToolbar,
+		directTargetChild: View,
+		target: View,
+		axes: Int,
+		type: Int,
+	): Boolean {
+		return axes == ViewCompat.SCROLL_AXIS_VERTICAL
+	}
+
+}

app/src/main/java/org/koitharu/kotatsu/search/ui/widget/SearchEditText.kt

@@ -0,0 +1,30 @@
+package org.koitharu.kotatsu.search.ui.widget
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.KeyEvent
+import androidx.annotation.AttrRes
+import androidx.appcompat.widget.AppCompatEditText
+import com.google.android.material.R
+
+class SearchEditText @JvmOverloads constructor(
+	context: Context,
+	attrs: AttributeSet? = null,
+	@AttrRes defStyleAttr: Int = R.attr.editTextStyle,
+) : AppCompatEditText(context, attrs, defStyleAttr) {
+
+	override fun onKeyPreIme(keyCode: Int, event: KeyEvent): Boolean {
+		if (keyCode == KeyEvent.KEYCODE_BACK && event.action == KeyEvent.ACTION_UP) {
+			if (hasFocus()) {
+				clearFocus()
+				return true
+			}
+		}
+		return super.onKeyPreIme(keyCode, event)
+	}
+
+	override fun clearFocus() {
+		super.clearFocus()
+		text?.clear()
+	}
+} 

app/src/main/java/org/koitharu/kotatsu/search/ui/widget/SearchToolbar.kt

@@ -0,0 +1,24 @@
+package org.koitharu.kotatsu.search.ui.widget
+
+import android.content.Context
+import android.graphics.Color
+import android.util.AttributeSet
+import androidx.annotation.AttrRes
+import com.google.android.material.R
+import com.google.android.material.appbar.MaterialToolbar
+import com.google.android.material.shape.MaterialShapeDrawable
+
+class SearchToolbar @JvmOverloads constructor(
+	context: Context,
+	attrs: AttributeSet? = null,
+	@AttrRes defStyleAttr: Int = R.attr.toolbarStyle,
+) : MaterialToolbar(context, attrs, defStyleAttr) {
+
+	private val bgDrawable = MaterialShapeDrawable(context, attrs, defStyleAttr, 0)
+
+	init {
+		bgDrawable.initializeElevationOverlay(context)
+		bgDrawable.setShadowColor(Color.DKGRAY)
+		background = bgDrawable
+	}
+}