1 files changed, 91 insertions, 0 deletions
diff --git a/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/attachments/CardAttachmentsBottomsheetBehaviorCallback.java b/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/attachments/CardAttachmentsBottomsheetBehaviorCallback.java
new file mode 100644
index 000000000..6b60bbffd
--- /dev/null
+++ b/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/attachments/CardAttachmentsBottomsheetBehaviorCallback.java
@@ -0,0 +1,91 @@
+package it.niedermann.nextcloud.deck.ui.card.attachments;
+
+import android.content.Context;
+import android.view.View;
+
+import androidx.activity.OnBackPressedCallback;
+import androidx.annotation.ColorInt;
+import androidx.annotation.ColorRes;
+import androidx.annotation.DimenRes;
+import androidx.annotation.NonNull;
+import androidx.annotation.Px;
+import androidx.core.content.ContextCompat;
+
+import com.google.android.material.animation.ArgbEvaluatorCompat;
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+import com.google.android.material.bottomsheet.BottomSheetBehavior;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+
+import it.niedermann.android.util.DimensionUtil;
+
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static com.google.android.material.bottomsheet.BottomSheetBehavior.STATE_HIDDEN;
+
+public class CardAttachmentsBottomsheetBehaviorCallback extends BottomSheetBehavior.BottomSheetCallback {
+    @NonNull
+    private final OnBackPressedCallback backPressedCallback;
+    @NonNull
+    private final FloatingActionButton fab;
+    @NonNull
+    private final View pickerBackdrop;
+    @NonNull
+    private final BottomNavigationView bottomNavigation;
+    @ColorInt
+    private final int backdropColorExpanded;
+    @ColorInt
+    private final int backdropColorCollapsed;
+    @Px
+    private final int bottomNavigationHeight;
+
+    private float lastOffset = -1;
+
+    public CardAttachmentsBottomsheetBehaviorCallback(@NonNull Context context,
+                                                      @NonNull OnBackPressedCallback backPressedCallback,
+                                                      @NonNull FloatingActionButton fab,
+                                                      @NonNull View pickerBackdrop,
+                                                      @NonNull BottomNavigationView bottomNavigation,
+                                                      @ColorRes int backdropColorExpanded,
+                                                      @ColorRes int backdropColorCollapsed,
+                                                      @DimenRes int bottomNavigationHeight
+    ) {
+        this.backPressedCallback = backPressedCallback;
+        this.fab = fab;
+        this.pickerBackdrop = pickerBackdrop;
+        this.bottomNavigation = bottomNavigation;
+        this.backdropColorExpanded = ContextCompat.getColor(context, backdropColorExpanded);
+        this.backdropColorCollapsed = ContextCompat.getColor(context, backdropColorCollapsed);
+        this.bottomNavigationHeight = DimensionUtil.INSTANCE.dpToPx(context, bottomNavigationHeight);
+    }
+
+    @Override
+    public void onStateChanged(@NonNull View bottomSheet, int newState) {
+        if (newState == STATE_HIDDEN) {
+            backPressedCallback.setEnabled(false);
+            if (pickerBackdrop.getVisibility() != GONE) {
+                pickerBackdrop.setVisibility(GONE);
+            }
+        } else if (pickerBackdrop.getVisibility() != VISIBLE) {
+            pickerBackdrop.setVisibility(VISIBLE);
+        }
+    }
+
+    @Override
+    public void onSlide(@NonNull View bottomSheet, float slideOffset) {
+        if (slideOffset <= 0) {
+            final float bottomSheetPercentageShown = slideOffset * -1;
+            pickerBackdrop.setBackgroundColor(ArgbEvaluatorCompat.getInstance().evaluate(bottomSheetPercentageShown, backdropColorExpanded, backdropColorCollapsed));
+            bottomNavigation.setTranslationY(bottomSheetPercentageShown * bottomNavigationHeight);
+            if (slideOffset <= lastOffset && slideOffset != 0) {
+                if (fab.getVisibility() == GONE) {
+                    fab.show();
+                }
+            } else {
+                if (fab.getVisibility() == VISIBLE) {
+                    fab.hide();
+                }
+            }
+        }
+        lastOffset = slideOffset;
+    }
+}