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+/*
+ * Copyright (C) 2015 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;
+
+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.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewTreeObserver;
+import android.widget.FrameLayout;
+
+import com.android.setupwizardlib.annotations.Keep;
+
+/**
+ * A generic template class that inflates a template, provided in the constructor or in
+ * {@code android:layout} through XML, and adds its children to a "container" in the template. When
+ * inflating this layout from XML, the {@code android:layout} and {@code suwContainer} attributes
+ * are required.
+ */
+public class TemplateLayout extends FrameLayout {
+
+ /**
+ * The container of the actual content. This will be a view in the template, which child views
+ * will be added to when {@link #addView(View)} is called.
+ */
+ private ViewGroup mContainer;
+
+ public TemplateLayout(Context context, int template, int containerId) {
+ super(context);
+ init(template, containerId, null, R.attr.suwLayoutTheme);
+ }
+
+ public TemplateLayout(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ init(0, 0, attrs, R.attr.suwLayoutTheme);
+ }
+
+ @TargetApi(VERSION_CODES.HONEYCOMB)
+ public TemplateLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+ super(context, attrs, defStyleAttr);
+ init(0, 0, attrs, defStyleAttr);
+ }
+
+ // All the constructors delegate to this init method. The 3-argument constructor is not
+ // available in LinearLayout before v11, so call super with the exact same arguments.
+ private void init(int template, int containerId, AttributeSet attrs, int defStyleAttr) {
+ final TypedArray a = getContext().obtainStyledAttributes(attrs,
+ R.styleable.SuwTemplateLayout, defStyleAttr, 0);
+ if (template == 0) {
+ template = a.getResourceId(R.styleable.SuwTemplateLayout_android_layout, 0);
+ }
+ if (containerId == 0) {
+ containerId = a.getResourceId(R.styleable.SuwTemplateLayout_suwContainer, 0);
+ }
+ inflateTemplate(template, containerId);
+
+ a.recycle();
+ }
+
+ @Override
+ public void addView(View child, int index, ViewGroup.LayoutParams params) {
+ mContainer.addView(child, index, params);
+ }
+
+ private void addViewInternal(View child) {
+ super.addView(child, -1, generateDefaultLayoutParams());
+ }
+
+ private void inflateTemplate(int templateResource, int containerId) {
+ final LayoutInflater inflater = LayoutInflater.from(getContext());
+ final View templateRoot = onInflateTemplate(inflater, templateResource);
+ addViewInternal(templateRoot);
+
+ mContainer = findContainer(containerId);
+ if (mContainer == null) {
+ throw new IllegalArgumentException("Container cannot be null in TemplateLayout");
+ }
+ onTemplateInflated();
+ }
+
+ /**
+ * This method inflates the template. Subclasses can override this method to customize the
+ * template inflation, or change to a different default template. The root of the inflated
+ * layout should be returned, and not added to the view hierarchy.
+ *
+ * @param inflater A LayoutInflater to inflate the template.
+ * @param template The resource ID of the template to be inflated, or 0 if no template is
+ * specified.
+ * @return Root of the inflated layout.
+ */
+ protected View onInflateTemplate(LayoutInflater inflater, int template) {
+ if (template == 0) {
+ throw new IllegalArgumentException("android:layout not specified for TemplateLayout");
+ }
+ return inflater.inflate(template, this, false);
+ }
+
+ protected ViewGroup findContainer(int containerId) {
+ if (containerId == 0) {
+ // Maintain compatibility with the deprecated way of specifying container ID.
+ containerId = getContainerId();
+ }
+ return (ViewGroup) findViewById(containerId);
+ }
+
+ /**
+ * This is called after the template has been inflated and added to the view hierarchy.
+ * Subclasses can implement this method to modify the template as necessary, such as caching
+ * views retrieved from findViewById, or other view operations that need to be done in code.
+ * You can think of this as {@link View#onFinishInflate()} but for inflation of the
+ * template instead of for child views.
+ */
+ protected void onTemplateInflated() {
+ }
+
+ /**
+ * @return ID of the default container for this layout. This will be used to find the container
+ * ViewGroup, which all children views of this layout will be placed in.
+ * @deprecated Override {@link #findContainer(int)} instead.
+ */
+ @Deprecated
+ protected int getContainerId() {
+ return 0;
+ }
+
+ /* Animator support */
+
+ private float mXFraction;
+ private ViewTreeObserver.OnPreDrawListener mPreDrawListener;
+
+ /**
+ * Set the X translation as a fraction of the width of this view. Make sure this method is not
+ * stripped out by proguard when using this with {@link android.animation.ObjectAnimator}. You
+ * may need to add
+ * <code>
+ * -keep @com.android.setupwizardlib.annotations.Keep class *
+ * </code>
+ * to your proguard configuration if you are seeing mysterious {@link NoSuchMethodError} at
+ * runtime.
+ */
+ @Keep
+ @TargetApi(VERSION_CODES.HONEYCOMB)
+ public void setXFraction(float fraction) {
+ mXFraction = fraction;
+ final int width = getWidth();
+ if (width != 0) {
+ setTranslationX(width * fraction);
+ } else {
+ // If we haven't done a layout pass yet, wait for one and then set the fraction before
+ // the draw occurs using an OnPreDrawListener. Don't call translationX until we know
+ // getWidth() has a reliable, non-zero value or else we will see the fragment flicker on
+ // screen.
+ if (mPreDrawListener == null) {
+ mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {
+ @Override
+ public boolean onPreDraw() {
+ getViewTreeObserver().removeOnPreDrawListener(mPreDrawListener);
+ setXFraction(mXFraction);
+ return true;
+ }
+ };
+ getViewTreeObserver().addOnPreDrawListener(mPreDrawListener);
+ }
+ }
+ }
+
+ /**
+ * Return the X translation as a fraction of the width, as previously set in
+ * {@link #setXFraction(float)}.
+ *
+ * @see #setXFraction(float)
+ */
+ @Keep
+ @TargetApi(VERSION_CODES.HONEYCOMB)
+ public float getXFraction() {
+ return mXFraction;
+ }
+}