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use count for performance

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This commit is contained in:
cgspine
2020-12-22 17:47:43 +08:00
parent bd88c20b91
commit fcede26ac4
1 changed files with 21 additions and 7 deletions
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qmui/src/main/java/com/qmuiteam/qmui/recyclerView/QMUIRVDraggableScrollBar.java
+21 -7
View File
@@ -27,6 +27,7 @@ import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.content.ContextCompat;
import androidx.core.graphics.drawable.DrawableCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.qmuiteam.qmui.R;
@@ -44,6 +45,7 @@ public class QMUIRVDraggableScrollBar extends RecyclerView.ItemDecoration implem
private int[] STATE_NORMAL = new int[]{};
private static final long DEFAULT_KEE_SHOW_DURATION = 800L;
private static final long DEFAULT_TRANSITION_DURATION = 100L;
private static final int MIN_COUNT_FOR_PERCENT_CALCULATE = 1000;
RecyclerView mRecyclerView;
QMUIStickySectionLayout mStickySectionLayout;
@@ -345,13 +347,19 @@ public class QMUIRVDraggableScrollBar extends RecyclerView.ItemDecoration implem
recyclerView.scrollToPosition(adapter.getItemCount() - 1);
}
} else {
int range = getScrollRange(recyclerView);
int offset = getCurrentOffset(recyclerView);
int delta = (int) (range * mPercent - offset);
if (mIsVerticalScroll) {
recyclerView.scrollBy(0, delta);
} else {
recyclerView.scrollBy(delta, 0);
RecyclerView.Adapter adapter = recyclerView.getAdapter();
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if(adapter != null && adapter.getItemCount() > MIN_COUNT_FOR_PERCENT_CALCULATE && layoutManager instanceof LinearLayoutManager){
((LinearLayoutManager)layoutManager).scrollToPositionWithOffset((int) (adapter.getItemCount() * mPercent), 0);
}else{
int range = getScrollRange(recyclerView);
int offset = getCurrentOffset(recyclerView);
int delta = (int) (range * mPercent - offset);
if (mIsVerticalScroll) {
recyclerView.scrollBy(0, delta);
} else {
recyclerView.scrollBy(delta, 0);
}
}
}
invalidate();
@@ -451,6 +459,12 @@ public class QMUIRVDraggableScrollBar extends RecyclerView.ItemDecoration implem
}
private float calculatePercent(@NonNull RecyclerView recyclerView) {
RecyclerView.Adapter adapter = recyclerView.getAdapter();
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if(adapter != null && adapter.getItemCount() > MIN_COUNT_FOR_PERCENT_CALCULATE && layoutManager instanceof LinearLayoutManager){
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
return linearLayoutManager.findFirstCompletelyVisibleItemPosition() * 1f / adapter.getItemCount();
}
return QMUILangHelper.constrain(getCurrentOffset(recyclerView) * 1f / getScrollRange(recyclerView), 0f, 1f);
}