262 lines
No EOL
8.6 KiB
Java
262 lines
No EOL
8.6 KiB
Java
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.support.v7.internal.widget;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.support.v7.appcompat.R;
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import android.util.AttributeSet;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewParent;
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import java.lang.ref.WeakReference;
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/**
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* Backport of {@link android.view.ViewStub} so that we can set the
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* {@link android.view.LayoutInflater} on devices before Jelly Bean.
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*
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* @hide
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*/
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public final class ViewStubCompat extends View {
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private int mLayoutResource = 0;
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private int mInflatedId;
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private WeakReference<View> mInflatedViewRef;
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private LayoutInflater mInflater;
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private OnInflateListener mInflateListener;
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public ViewStubCompat(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public ViewStubCompat(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewStubCompat,
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defStyle, 0);
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mInflatedId = a.getResourceId(R.styleable.ViewStubCompat_android_inflatedId, NO_ID);
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mLayoutResource = a.getResourceId(R.styleable.ViewStubCompat_android_layout, 0);
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setId(a.getResourceId(R.styleable.ViewStubCompat_android_id, NO_ID));
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a.recycle();
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setVisibility(GONE);
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setWillNotDraw(true);
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}
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/**
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* Returns the id taken by the inflated view. If the inflated id is
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* {@link View#NO_ID}, the inflated view keeps its original id.
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*
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* @return A positive integer used to identify the inflated view or
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* {@link #NO_ID} if the inflated view should keep its id.
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*
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* @see #setInflatedId(int)
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* @attr ref android.R.styleable#ViewStub_inflatedId
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*/
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public int getInflatedId() {
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return mInflatedId;
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}
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/**
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* Defines the id taken by the inflated view. If the inflated id is
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* {@link View#NO_ID}, the inflated view keeps its original id.
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*
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* @param inflatedId A positive integer used to identify the inflated view or
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* {@link #NO_ID} if the inflated view should keep its id.
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*
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* @see #getInflatedId()
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* @attr ref android.R.styleable#ViewStub_inflatedId
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*/
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public void setInflatedId(int inflatedId) {
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mInflatedId = inflatedId;
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}
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/**
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* Returns the layout resource that will be used by {@link #setVisibility(int)} or
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* {@link #inflate()} to replace this StubbedView
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* in its parent by another view.
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*
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* @return The layout resource identifier used to inflate the new View.
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*
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* @see #setLayoutResource(int)
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* @see #setVisibility(int)
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* @see #inflate()
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* @attr ref android.R.styleable#ViewStub_layout
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*/
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public int getLayoutResource() {
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return mLayoutResource;
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}
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/**
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* Specifies the layout resource to inflate when this StubbedView becomes visible or invisible
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* or when {@link #inflate()} is invoked. The View created by inflating the layout resource is
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* used to replace this StubbedView in its parent.
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*
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* @param layoutResource A valid layout resource identifier (different from 0.)
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*
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* @see #getLayoutResource()
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* @see #setVisibility(int)
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* @see #inflate()
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* @attr ref android.R.styleable#ViewStub_layout
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*/
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public void setLayoutResource(int layoutResource) {
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mLayoutResource = layoutResource;
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}
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/**
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* Set {@link LayoutInflater} to use in {@link #inflate()}, or {@code null}
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* to use the default.
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*/
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public void setLayoutInflater(LayoutInflater inflater) {
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mInflater = inflater;
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}
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/**
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* Get current {@link LayoutInflater} used in {@link #inflate()}.
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*/
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public LayoutInflater getLayoutInflater() {
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return mInflater;
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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setMeasuredDimension(0, 0);
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}
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@Override
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public void draw(Canvas canvas) {
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}
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@Override
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protected void dispatchDraw(Canvas canvas) {
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}
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/**
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* When visibility is set to {@link #VISIBLE} or {@link #INVISIBLE},
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* {@link #inflate()} is invoked and this StubbedView is replaced in its parent
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* by the inflated layout resource. After that calls to this function are passed
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* through to the inflated view.
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*
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* @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
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*
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* @see #inflate()
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*/
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@Override
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public void setVisibility(int visibility) {
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if (mInflatedViewRef != null) {
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View view = mInflatedViewRef.get();
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if (view != null) {
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view.setVisibility(visibility);
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} else {
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throw new IllegalStateException("setVisibility called on un-referenced view");
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}
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} else {
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super.setVisibility(visibility);
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if (visibility == VISIBLE || visibility == INVISIBLE) {
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inflate();
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}
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}
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}
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/**
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* Inflates the layout resource identified by {@link #getLayoutResource()}
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* and replaces this StubbedView in its parent by the inflated layout resource.
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*
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* @return The inflated layout resource.
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*
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*/
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public View inflate() {
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final ViewParent viewParent = getParent();
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if (viewParent != null && viewParent instanceof ViewGroup) {
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if (mLayoutResource != 0) {
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final ViewGroup parent = (ViewGroup) viewParent;
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final LayoutInflater factory;
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if (mInflater != null) {
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factory = mInflater;
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} else {
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factory = LayoutInflater.from(getContext());
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}
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final View view = factory.inflate(mLayoutResource, parent,
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false);
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if (mInflatedId != NO_ID) {
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view.setId(mInflatedId);
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}
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final int index = parent.indexOfChild(this);
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parent.removeViewInLayout(this);
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final ViewGroup.LayoutParams layoutParams = getLayoutParams();
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if (layoutParams != null) {
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parent.addView(view, index, layoutParams);
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} else {
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parent.addView(view, index);
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}
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mInflatedViewRef = new WeakReference<View>(view);
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if (mInflateListener != null) {
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mInflateListener.onInflate(this, view);
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}
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return view;
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} else {
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throw new IllegalArgumentException("ViewStub must have a valid layoutResource");
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}
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} else {
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throw new IllegalStateException("ViewStub must have a non-null ViewGroup viewParent");
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}
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}
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/**
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* Specifies the inflate listener to be notified after this ViewStub successfully
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* inflated its layout resource.
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*
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* @param inflateListener The OnInflateListener to notify of successful inflation.
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*
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* @see android.view.ViewStub.OnInflateListener
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*/
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public void setOnInflateListener(OnInflateListener inflateListener) {
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mInflateListener = inflateListener;
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}
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/**
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* Listener used to receive a notification after a ViewStub has successfully
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* inflated its layout resource.
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*
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* @see android.view.ViewStub#setOnInflateListener(android.view.ViewStub.OnInflateListener)
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*/
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public static interface OnInflateListener {
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/**
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* Invoked after a ViewStub successfully inflated its layout resource.
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* This method is invoked after the inflated view was added to the
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* hierarchy but before the layout pass.
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*
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* @param stub The ViewStub that initiated the inflation.
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* @param inflated The inflated View.
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*/
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void onInflate(ViewStubCompat stub, View inflated);
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}
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} |