Added ViewRotator Widget

Author: svignesh93

widgetslib/build.gradle

@@ -58,6 +58,7 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     implementation 'androidx.core:core-ktx:1.3.2'
     implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.2.1'
     testImplementation 'junit:junit:4.13.1'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

widgetslib/src/main/kotlin/com/litekite/widget/ViewRotator.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2020 LiteKite Startup. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.litekite.widget
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.ViewGroup
+
+/**
+ * This ViewGroup contains a single view, which will be rotated by 90 degrees counterclockwise.
+ *
+ * <p>This implementation was referenced from Android Open Source Project's MusicFX Android App:
+ * aosp_root/packages/apps/MusicFX/src/com/android/musicfx/SeekBarRotator.java</p>
+ *
+ * @author Vignesh S
+ * @version 1.0, 03/11/2020
+ * @since 1.0
+ */
+@Suppress("UNUSED")
+class ViewRotator @JvmOverloads constructor(
+	context: Context,
+	attrs: AttributeSet? = null,
+	defStyleAttr: Int = 0
+) : ViewGroup(context, attrs, defStyleAttr) {
+
+	override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+		val childView = getChildAt(0)
+		if (childView != null && childView.visibility != GONE) {
+			// swap width and height for child
+			measureChild(childView, heightMeasureSpec, widthMeasureSpec)
+			setMeasuredDimension(childView.measuredHeightAndState, childView.measuredWidthAndState)
+		} else {
+			setMeasuredDimension(
+				resolveSizeAndState(0, widthMeasureSpec, 0),
+				resolveSizeAndState(0, heightMeasureSpec, 0)
+			)
+		}
+	}
+
+	override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
+		val childView = getChildAt(0)
+		if (childView != null && childView.visibility != GONE) {
+			// rotate the child 90 degrees counterclockwise around its upper-left
+			childView.pivotX = 0f
+			childView.pivotY = 0f
+			childView.rotation = -90f
+			// place the child below this view, so it rotates into view
+			val width = r - l
+			val height = b - t
+			childView.layout(0, height, height, width + height)
+		}
+	}
+
+}