Add can scroll listener.

alibaba · Mar 12, 2019 · 6c5232c · 6c5232c
1 parent 0c03bbc
commit 6c5232c
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Showing 3 changed files with 39 additions and 2 deletions.
diff --git a/examples/src/main/java/com/alibaba/android/vlayout/example/VLayoutActivity.java b/examples/src/main/java/com/alibaba/android/vlayout/example/VLayoutActivity.java
@@ -29,6 +29,7 @@
 import com.alibaba.android.vlayout.RecyclablePagerAdapter;
 import com.alibaba.android.vlayout.VirtualLayoutManager;
 import com.alibaba.android.vlayout.VirtualLayoutManager.LayoutParams;
+import com.alibaba.android.vlayout.extend.LayoutManagerCanScrollListener;
 import com.alibaba.android.vlayout.extend.PerformanceMonitor;
 import com.alibaba.android.vlayout.extend.ViewLifeCycleListener;
 import com.alibaba.android.vlayout.layout.ColumnLayoutHelper;
@@ -197,6 +198,20 @@ public void onDisappeared(View view) {
             }
         });
 
+        layoutManager.setLayoutManagerCanScrollListener(new LayoutManagerCanScrollListener() {
+            @Override
+            public boolean canScrollVertically() {
+                Log.i("vlayout", "canScrollVertically: ");
+                return true;
+            }
+
+            @Override
+            public boolean canScrollHorizontally() {
+                Log.i("vlayout", "canScrollHorizontally: ");
+                return true;
+            }
+        });
+
         final DelegateAdapter delegateAdapter = new DelegateAdapter(layoutManager, true);
 
         recyclerView.setAdapter(delegateAdapter);

diff --git a/vlayout/src/main/java/com/alibaba/android/vlayout/VirtualLayoutManager.java b/vlayout/src/main/java/com/alibaba/android/vlayout/VirtualLayoutManager.java
@@ -39,6 +39,7 @@
 import android.view.ViewGroup;
 import android.view.ViewParent;
 
+import com.alibaba.android.vlayout.extend.LayoutManagerCanScrollListener;
 import com.alibaba.android.vlayout.extend.PerformanceMonitor;
 import com.alibaba.android.vlayout.extend.ViewLifeCycleHelper;
 import com.alibaba.android.vlayout.extend.ViewLifeCycleListener;
@@ -100,6 +101,8 @@ public static void enableDebugging(boolean isDebug) {
 
     private boolean mCanScrollVertically;
 
+    private LayoutManagerCanScrollListener layoutManagerCanScrollListener;
+
     private boolean mEnableMarginOverlapping = false;
 
     private int mMaxMeasureSize = -1;
@@ -169,6 +172,10 @@ public void setCanScrollHorizontally(boolean canScrollHorizontally) {
         this.mCanScrollHorizontally = canScrollHorizontally;
     }
 
+    public void setLayoutManagerCanScrollListener(LayoutManagerCanScrollListener layoutManagerCanScrollListener) {
+        this.layoutManagerCanScrollListener = layoutManagerCanScrollListener;
+    }
+
     public void setNestedScrolling(boolean nestedScrolling) {
         setNestedScrolling(nestedScrolling, -1);
     }
@@ -1327,12 +1334,20 @@ public int getChildMeasureSpec(int parentSize, int size, boolean canScroll) {
 
     @Override
     public boolean canScrollHorizontally() {
-        return mCanScrollHorizontally && !mNoScrolling;
+        boolean ret = true;
+        if (layoutManagerCanScrollListener != null) {
+            ret = ret && layoutManagerCanScrollListener.canScrollHorizontally();
+        }
+        return mCanScrollHorizontally && !mNoScrolling && ret;
     }
 
     @Override
     public boolean canScrollVertically() {
-        return mCanScrollVertically && !mNoScrolling;
+        boolean ret = true;
+        if (layoutManagerCanScrollListener != null) {
+            ret = ret && layoutManagerCanScrollListener.canScrollVertically();
+        }
+        return mCanScrollVertically && !mNoScrolling && ret;
     }
 
     @Override

diff --git a/vlayout/src/main/java/com/alibaba/android/vlayout/extend/LayoutManagerCanScrollListener.java b/vlayout/src/main/java/com/alibaba/android/vlayout/extend/LayoutManagerCanScrollListener.java
@@ -0,0 +1,7 @@
+package com.alibaba.android.vlayout.extend;
+
+public interface LayoutManagerCanScrollListener {
+    boolean canScrollVertically();
+
+    boolean canScrollHorizontally();
+}