- 'BaseItemProvider' add attached to window method

CymChad · May 18, 2020 · d20dab2 · d20dab2
1 parent 9bedb87
commit d20dab2
Show file tree

Hide file tree

Showing 2 changed files with 36 additions and 0 deletions.
diff --git a/library/src/main/java/com/chad/library/adapter/base/BaseProviderMultiAdapter.kt b/library/src/main/java/com/chad/library/adapter/base/BaseProviderMultiAdapter.kt
@@ -79,6 +79,16 @@ abstract class BaseProviderMultiAdapter<T>(data: MutableList<T>? = null) :
         return mItemProviders.get(viewType)
     }
 
+    override fun onViewAttachedToWindow(holder: BaseViewHolder) {
+        super.onViewAttachedToWindow(holder)
+        getItemProvider(holder.itemViewType)?.onViewAttachedToWindow(holder)
+    }
+
+    override fun onViewDetachedFromWindow(holder: BaseViewHolder) {
+        super.onViewDetachedFromWindow(holder)
+        getItemProvider(holder.itemViewType)?.onViewDetachedFromWindow(holder)
+    }
+
     protected open fun bindClick(viewHolder: BaseViewHolder) {
         if (getOnItemClickListener() == null) {
             //如果没有设置点击监听，则回调给 itemProvider

diff --git a/library/src/main/java/com/chad/library/adapter/base/provider/BaseItemProvider.kt b/library/src/main/java/com/chad/library/adapter/base/provider/BaseItemProvider.kt
@@ -56,6 +56,32 @@ abstract class BaseItemProvider<T> {
      */
     open fun onViewHolderCreated(viewHolder: BaseViewHolder, viewType: Int) {}
 
+    /**
+     * Called when a view created by this [BaseItemProvider] has been attached to a window.
+     * 当此[BaseItemProvider]出现在屏幕上的时候，会调用此方法
+     *
+     * This can be used as a reasonable signal that the view is about to be seen
+     * by the user. If the [BaseItemProvider] previously freed any resources in
+     * [onViewDetachedFromWindow][.onViewDetachedFromWindow]
+     * those resources should be restored here.
+     *
+     * @param holder Holder of the view being attached
+     */
+    open fun onViewAttachedToWindow(holder: BaseViewHolder) {}
+
+    /**
+     * Called when a view created by this [BaseItemProvider] has been detached from its
+     * window.
+     * 当此[BaseItemProvider]从屏幕上移除的时候，会调用此方法
+     *
+     * Becoming detached from the window is not necessarily a permanent condition;
+     * the consumer of an Adapter's views may choose to cache views offscreen while they
+     * are not visible, attaching and detaching them as appropriate.
+     *
+     * @param holder Holder of the view being detached
+     */
+    open fun onViewDetachedFromWindow(holder: BaseViewHolder) {}
+
     /**
      * item 若想实现条目点击事件则重写该方法
      * @param helper VH