Glide工厂模式3【TransitionFactory】【Transition】 |
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Transition 包路径：com.bumptech.glide.request.transition.Transition Transition接口业务是TransitionFactory的生产对象目标 /** * An interface that allows a transition to be applied to {@link android.view.View}s in {@link * com.bumptech.glide.request.target.Target}s in across resource types. Targets that wrap views will * be able to provide all of the necessary arguments and start the transition. Those that do not * will be unable to provide the necessary arguments and will therefore be forced to ignore the * transition. This interface is a compromise that allows view specific transition in Glide's * complex world of arbitrary resource types and arbitrary target types. * * @param The type of the resource whose entrance will be transitioned. */ public interface Transition { 。。。一个允许跨资源类型将转换应用到目标中的视图的接口。包装视图的目标将能够提供所有必要的参数并开始转换。不这样做的那将无法提供必要的参数，因此将被迫忽视过渡。这个接口是一种折衷，它允许在Glide的任意资源类型和任意目标类型的复杂世界中查看特定的过渡。 类型参数: R -其入口将被转换的资源的类型。 /** * An interface wrapping a view that exposes the necessary methods to run the various types of * android animations as transitions: ({@link ViewTransition}, {@link ViewPropertyTransition} and * animated {@link android.graphics.drawable.Drawable}s). */ interface ViewAdapter { /** Returns the wrapped {@link android.view.View}. */ 返回被包装的视图。 View getView();一个接口包装了一个视图，它公开了必要的方法来运行各种类型的android动画的过渡(ViewTransition, ViewPropertyTransition和animated Drawables)。 /** * Returns the current drawable being displayed in the view, or null if no such drawable exists * (or one cannot be retrieved). */ @Nullable Drawable getCurrentDrawable();返回视图中显示的当前绘制对象，如果不存在该绘制对象(或无法检索)，则返回null。 /** * Sets the current drawable (usually an animated drawable) to display in the wrapped view. * * @param drawable The drawable to display in the wrapped view. */ void setDrawable(Drawable drawable); }设置当前绘制对象(通常是动画绘制对象)显示在换行视图中。 /** * Animates from the previous {@link android.graphics.drawable.Drawable} that is currently being * displayed in the given view, if not null, to the new resource that should be displayed in the * view. * * @param current The new resource that will be displayed in the view. * @param adapter The {@link Transition.ViewAdapter} wrapping a view that can at least return an * {@link android.view.View} from {@link Transition.ViewAdapter#getView()}. * @return True if in the process of running the transition, the new resource was put on the view, * false if the caller needs to manually put the current resource on the view. */ boolean transition(R current, ViewAdapter adapter); }从当前在给定视图中显示的前一个Drawable动画，如果不为空，到应该在视图中显示的新资源。 参数: current—将在视图中显示的新资源。 适配器-过渡。ViewAdapter包装的视图至少可以从Transition.ViewAdapter.getView()返回一个视图。 返回: 如果在运行转换的过程中，新资源被放到视图上，则为True，如果调用者需要手动将当前资源放到视图上，则为false。 使用GlideApp.with(context) .load(url) .transition(withCrossFade(factory)) .diskCacheStrategy(DiskCacheStrategy.ALL) .placeholder(R.color.placeholder) .into(imageView);很显然和设置转换.transition(withCrossFade(factory))相关 TransitionFactory包路径：com.bumptech.glide.request.transition.TransitionFactory /** * A factory class that can produce different {@link Transition}s based on the state of the request. * * @param The type of resource that needs to be animated into the target. */ public interface TransitionFactory {一个工厂类，它可以根据请求的状态生成不同的转换。 类型参数: R -需要动画到目标中的资源的类型。 /** * Returns a new {@link Transition}. * * @param dataSource The {@link com.bumptech.glide.load.DataSource} the resource was loaded from. * @param isFirstResource True if this is the first resource to be loaded into the target. */ Transition build(DataSource dataSource, boolean isFirstResource); }返回一个新的过渡。 参数: 数据源-资源被加载的数据源。 isFirstResource -如果这是加载到目标中的第一个资源，则为True。 具体的实现工厂类如下列表BitmapContainerTransitionFactoryBitmapTransitionFactoryDrawableCrossFadeFactoryNoTransition.NoAnimationFactoryViewAnimationFactoryViewPropertyAnimationFactoryBitmapContainerTransitionFactory包路径：com.bumptech.glide.request.transition.BitmapContainerTransitionFactory /** * A {@link TransitionFactory} for complex types that have a {@link android.graphics.Bitmap} inside. * The transitioning bitmap is wrapped in a {@link android.graphics.drawable.BitmapDrawable}. Most * commonly used with {@link DrawableCrossFadeFactory}. * * @param The type of the composite object that contains the {@link android.graphics.Bitmap} to * be transitioned. */ public abstract class BitmapContainerTransitionFactory implements TransitionFactory { 。。。一个内部有位图的复杂类型的TransitionFactory。转换位图被包装在BitmapDrawable中。最常用的是drawablecrosfadefactory。 类型参数: R -包含要转换的位图的复合对象的类型。 @Override public Transition build(DataSource dataSource, boolean isFirstResource) { Transition transition = realFactory.build(dataSource, isFirstResource); return new BitmapGlideAnimation(transition); } private final class BitmapGlideAnimation implements Transition { private final Transition transition; BitmapGlideAnimation(Transition transition) { this.transition = transition; } @Override public boolean transition(R current, ViewAdapter adapter) { Resources resources = adapter.getView().getResources(); Drawable currentBitmap = new BitmapDrawable(resources, getBitmap(current)); return transition.transition(currentBitmap, adapter); } }BitmapTransitionFactory包路径：com.bumptech.glide.request.transition.BitmapTransitionFactory /** * A {@link TransitionFactory} for {@link android.graphics.Bitmap}s that uses a Drawable transition * factory to transition from an existing drawable already visible on the target to the new bitmap. * * @see BitmapContainerTransitionFactory */ public class BitmapTransitionFactory extends BitmapContainerTransitionFactory { public BitmapTransitionFactory(@NonNull TransitionFactory realFactory) { super(realFactory); } @Override @NonNull protected Bitmap getBitmap(@NonNull Bitmap current) { return current; } }用于位图的TransitionFactory，它使用一个Drawable转换工厂从一个已经在目标上可见的可绘制对象转换到新的位图。 DrawableCrossFadeFactory/** * A factory class that produces a new {@link Transition} that varies depending on whether or not * the drawable was loaded from the memory cache and whether or not the drawable is the first image * to be put on the target. * *Resources are usually loaded from the memory cache just before the user can see the view, for * example when the user changes screens or scrolls back and forth in a list. In those cases the * user typically does not expect to see a transition. As a result, when the resource is loaded from * the memory cache this factory produces an {@link NoTransition}. */ // Public API. @SuppressWarnings("WeakerAccess") public class DrawableCrossFadeFactory implements TransitionFactory { 。。。 一个工厂类，它生成一个新的Transition，这个Transition取决于绘制对象是否从内存缓存中加载，以及绘制对象是否是第一个放到目标上的图像。 资源通常在用户可以看到视图之前从内存缓存加载，例如当用户更改屏幕或在列表中来回滚动时。在这些情况下，用户通常不希望看到转换。因此，当资源从内存缓存加载时，这个工厂产生一个NoTransition NoTransition.NoAnimationFactory/** * A factory that always returns the same {@link NoTransition}. * * @param the resource type that will be transitioned into a {@link * com.bumptech.glide.request.target.Target}. */ public static class NoAnimationFactory implements TransitionFactory { @SuppressWarnings("unchecked") @Override public Transition build(DataSource dataSource, boolean isFirstResource) { return (Transition) NO_ANIMATION; } }总是返回相同NoTransition的工厂。 类型参数: R -将被转换到Target的资源类型。 ViewAnimationFactory/** * A {@link TransitionFactory} that produces {@link ViewTransition}s. * * @param The type of the resource that will be transitioned into a view. */ public class ViewAnimationFactory implements TransitionFactory { 。。。一个生成视图转换的TransitionFactory。 类型参数: R -将被转换到视图的资源的类型。 ViewPropertyAnimationFactory/** * A {@link TransitionFactory} that produces ViewPropertyAnimations. * * @param The type of the resource that will be transitioned into a view. */ public class ViewPropertyAnimationFactory implements TransitionFactory {一个生成ViewPropertyAnimations的TransitionFactory。 类型参数: R -将被转换到视图的资源的类型。 小计在Glide里比较通用的工厂模式结构使用形式，看完前几篇这篇也很容易理解意图 |
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