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NT: move item touch helper to the adapter
[mobile-ledger.git] / app / src / main / java / net / ktnx / mobileledger / ui / MobileLedgerListFragment.java
1 /*
2  * Copyright © 2019 Damyan Ivanov.
3  * This file is part of MoLe.
4  * MoLe is free software: you can distribute it and/or modify it
5  * under the term of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your opinion), any later version.
8  *
9  * MoLe is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License terms for details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
16  */
17
18 package net.ktnx.mobileledger.ui;
19
20 import android.view.MotionEvent;
21
22 import androidx.annotation.NonNull;
23 import androidx.fragment.app.Fragment;
24 import androidx.recyclerview.widget.RecyclerView;
25 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
26
27 import net.ktnx.mobileledger.ui.activity.MainActivity;
28 import net.ktnx.mobileledger.ui.transaction_list.TransactionListAdapter;
29 import net.ktnx.mobileledger.utils.Colors;
30 import net.ktnx.mobileledger.utils.DimensionUtils;
31
32 public class MobileLedgerListFragment extends Fragment {
33     public SwipeRefreshLayout swiper;
34     public TransactionListAdapter modelAdapter;
35     protected MainActivity mActivity;
36     protected RecyclerView root;
37     protected void themeChanged(Integer counter) {
38         swiper.setColorSchemeColors(Colors.getColors());
39     }
40     public void onBackgroundTaskRunningChanged(Boolean isRunning) {
41         if (mActivity == null)
42             return;
43         if (swiper == null)
44             return;
45         swiper.setRefreshing(isRunning);
46     }
47     protected void manageFabOnScroll() {
48         int triggerPixels = DimensionUtils.dp2px(mActivity, 30f);
49         root.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
50             private float upAnchor = -1;
51             private float downAnchor = -1;
52             private float lastY;
53             @Override
54             public boolean onInterceptTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) {
55                 switch (e.getActionMasked()) {
56                     case MotionEvent.ACTION_DOWN:
57                         lastY = upAnchor = downAnchor = e.getAxisValue(MotionEvent.AXIS_Y);
58                         break;
59                     case MotionEvent.ACTION_MOVE:
60                         final float currentY = e.getAxisValue(MotionEvent.AXIS_Y);
61                         if (currentY > lastY) {
62                             // swipe down
63                             upAnchor = lastY;
64
65                             mActivity.fabShouldShow();
66                         }
67                         else {
68                             // swipe up
69                             downAnchor = lastY;
70
71                             if (currentY < upAnchor - triggerPixels)
72                                 mActivity.fabHide();
73                         }
74
75                         lastY = currentY;
76
77                         break;
78                 }
79                 return false;
80             }
81             @Override
82             public void onTouchEvent(@NonNull RecyclerView rv, @NonNull MotionEvent e) {
83             }
84             @Override
85             public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
86             }
87         });
88     }
89 }