1 files changed, 92 insertions, 0 deletions
diff --git a/library/main/src/com/android/setupwizardlib/view/IntrinsicSizeFrameLayout.java b/library/main/src/com/android/setupwizardlib/view/IntrinsicSizeFrameLayout.java
new file mode 100644
index 0000000..e9ab1a7
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+++ b/library/main/src/com/android/setupwizardlib/view/IntrinsicSizeFrameLayout.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.android.setupwizardlib.view;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.os.Build.VERSION_CODES;
+import android.util.AttributeSet;
+import android.widget.FrameLayout;
+
+import com.android.setupwizardlib.R;
+
+/**
+ * A FrameLayout subclass that has an "intrinsic size", which is the size it wants to be if that is
+ * within the constraints given by the parent. The intrinsic size can be set with the
+ * {@code android:width} and {@code android:height} attributes in XML.
+ *
+ * Note that for the intrinsic size to be meaningful, {@code android:layout_width} and/or
+ * {@code android:layout_height} will need to be {@code wrap_content}.
+ */
+public class IntrinsicSizeFrameLayout extends FrameLayout {
+
+    private int mIntrinsicHeight = 0;
+    private int mIntrinsicWidth = 0;
+
+    public IntrinsicSizeFrameLayout(Context context) {
+        super(context);
+        init(context, null, 0);
+    }
+
+    public IntrinsicSizeFrameLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs, 0);
+    }
+
+    @TargetApi(VERSION_CODES.HONEYCOMB)
+    public IntrinsicSizeFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context, attrs, defStyleAttr);
+    }
+
+    private void init(Context context, AttributeSet attrs, int defStyleAttr) {
+        final TypedArray a = context.obtainStyledAttributes(attrs,
+                R.styleable.SuwMaxSizeFrameLayout, defStyleAttr, 0);
+        mIntrinsicHeight =
+                a.getDimensionPixelSize(R.styleable.SuwMaxSizeFrameLayout_android_height, 0);
+        mIntrinsicWidth =
+                a.getDimensionPixelSize(R.styleable.SuwMaxSizeFrameLayout_android_width, 0);
+        a.recycle();
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(getIntrinsicMeasureSpec(widthMeasureSpec, mIntrinsicWidth),
+                getIntrinsicMeasureSpec(heightMeasureSpec, mIntrinsicHeight));
+    }
+
+    private int getIntrinsicMeasureSpec(int measureSpec, int intrinsicSize) {
+        if (intrinsicSize <= 0) {
+            // Intrinsic size is not set, just return the original spec
+            return measureSpec;
+        }
+        final int mode = MeasureSpec.getMode(measureSpec);
+        final int size = MeasureSpec.getSize(measureSpec);
+        if (mode == MeasureSpec.UNSPECIFIED) {
+            // Parent did not give any constraint, so we'll be the intrinsic size
+            return MeasureSpec.makeMeasureSpec(mIntrinsicHeight, MeasureSpec.EXACTLY);
+        } else if (mode == MeasureSpec.AT_MOST) {
+            // If intrinsic size is within parents constraint, take the intrinsic size.
+            // Otherwise take the parents size because that's closest to the intrinsic size.
+            return MeasureSpec.makeMeasureSpec(Math.min(size, mIntrinsicHeight),
+                    MeasureSpec.EXACTLY);
+        }
+        // Parent specified EXACTLY, or in all other cases, just return the original spec
+        return measureSpec;
+    }
+}