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Make the sticky date header only visible during scroll

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// FREEBIE
This commit is contained in:
Moxie Marlinspike
2017-01-25 16:38:36 -08:00
parent 2e16c6cf41
commit d46d3b72c8
7 changed files with 118 additions and 30 deletions
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27
src/org/thoughtcrime/securesms/util/StickyHeaderDecoration.java
View File

@@ -7,7 +7,6 @@ import android.support.v4.view.ViewCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
@@ -22,17 +21,21 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
private static final String TAG = StickyHeaderDecoration.class.getName();
private static final long NO_HEADER_ID = -1L;
private final Map<Long, ViewHolder> headerCache;
private final StickyHeaderAdapter adapter;
private final boolean renderInline;
private boolean sticky;
/**
* @param adapter the sticky header adapter to use
*/
public StickyHeaderDecoration(StickyHeaderAdapter adapter, boolean renderInline) {
public StickyHeaderDecoration(StickyHeaderAdapter adapter, boolean renderInline, boolean sticky) {
this.adapter = adapter;
this.headerCache = new HashMap<>();
this.renderInline = renderInline;
this.sticky = sticky;
}
/**
@@ -42,9 +45,9 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
RecyclerView.State state)
{
int position = parent.getChildAdapterPosition(view);
int position = parent.getChildAdapterPosition(view);
int headerHeight = 0;
if (position != RecyclerView.NO_POSITION && hasHeader(parent, adapter, position)) {
View header = getHeader(parent, adapter, position).itemView;
headerHeight = getHeaderHeightForLayout(header);
@@ -56,16 +59,14 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
private boolean hasHeader(RecyclerView parent, StickyHeaderAdapter adapter, int adapterPos) {
boolean isReverse = isReverseLayout(parent);
if (!adapter.isActive()) {
return false;
}
if (isReverse && adapterPos == ((RecyclerView.Adapter)adapter).getItemCount() - 1 || !isReverse && adapterPos == 0) {
return true;
}
int previous = adapterPos + (isReverse ? 1 : -1);
return adapter.getHeaderId(adapterPos) != adapter.getHeaderId(previous);
int previous = adapterPos + (isReverse ? 1 : -1);
long headerId = adapter.getHeaderId(adapterPos);
return headerId != NO_HEADER_ID && (headerId != adapter.getHeaderId(previous));
}
private ViewHolder getHeader(RecyclerView parent, StickyHeaderAdapter adapter, int position) {
@@ -109,7 +110,7 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
final int adapterPos = parent.getChildAdapterPosition(child);
if (adapterPos != RecyclerView.NO_POSITION && ((layoutPos == 0 && adapter.isActive()) || hasHeader(parent, adapter, adapterPos))) {
if (adapterPos != RecyclerView.NO_POSITION && ((layoutPos == 0 && sticky) || hasHeader(parent, adapter, adapterPos))) {
View header = getHeader(parent, adapter, adapterPos).itemView;
c.save();
final int left = child.getLeft();
@@ -146,7 +147,7 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
}
}
top = Math.max(0, top);
if (sticky) top = Math.max(0, top);
}
return top;
@@ -204,7 +205,5 @@ public class StickyHeaderDecoration extends RecyclerView.ItemDecoration {
* @param position the header's item position
*/
void onBindHeaderViewHolder(T viewHolder, int position);
boolean isActive();
}
}