#579 Compact mode - refactoring

1 files changed, 94 insertions, 0 deletions

diff --git a/app/src/main/java/it/niedermann/nextcloud/deck/ui/view/labellayout/LabelLayout.java b/app/src/main/java/it/niedermann/nextcloud/deck/ui/view/labellayout/LabelLayout.java
new file mode 100644
index 000000000..9a1d60021
--- /dev/null
+++ b/app/src/main/java/it/niedermann/nextcloud/deck/ui/view/labellayout/LabelLayout.java
@@ -0,0 +1,94 @@
+package it.niedermann.nextcloud.deck.ui.view.labellayout;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Px;
+
+import com.google.android.flexbox.FlexboxLayout;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import it.niedermann.nextcloud.deck.DeckLog;
+import it.niedermann.nextcloud.deck.R;
+import it.niedermann.nextcloud.deck.model.Label;
+import it.niedermann.nextcloud.deck.ui.view.labelchip.LabelChip;
+
+import static it.niedermann.nextcloud.deck.util.DimensionUtil.dpToPx;
+
+public abstract class LabelLayout extends FlexboxLayout {
+
+    @Px
+    final protected int gutter;
+    @NonNull
+    final private List<LabelChip> chipList = new LinkedList<>();
+
+    public LabelLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        this.gutter = dpToPx(context, R.dimen.spacer_1hx);
+    }
+
+    /**
+     * Instead of clearing and adding all labels, one can use this method to avoid flickering
+     */
+    public void updateLabels(@NonNull List<Label> labels) {
+        removeObsoleteLabels(labels);
+        addNewLabels(labels);
+    }
+
+    @Override
+    public void removeAllViews() {
+        super.removeAllViews();
+        this.chipList.clear();
+    }
+
+    @Override
+    public void removeViewAt(int index) {
+        // TODO this should also remove the item from chipList
+        DeckLog.logError(new UnsupportedOperationException("Not implemented yet"));
+        super.removeViewAt(index);
+    }
+
+    /**
+     * Remove all labels from the view which are not in the labels list
+     */
+    private void removeObsoleteLabels(List<Label> labels) {
+        chipList:
+        for (int i = 0; i < chipList.size(); i++) {
+            LabelChip currentChip = chipList.get(i);
+            final Label existingLabel = currentChip.getLabel();
+            for (Label label : labels) {
+                if (existingLabel.equals(label)) {
+                    continue chipList;
+                }
+            }
+            super.removeViewAt(i);
+            chipList.remove(currentChip);
+            i--;
+        }
+    }
+
+    /**
+     * Add all labels to the view which are not yet in the view but in the labels list
+     */
+    private void addNewLabels(List<Label> labels) {
+        int oldLabelSize = chipList.size();
+        labelList:
+        for (Label label : labels) {
+            for (int i = 0; i < oldLabelSize; i++) {
+                final LabelChip currentChip = chipList.get(i);
+                final Label existingLabel = currentChip.getLabel();
+                if (existingLabel.equals(label)) {
+                    continue labelList;
+                }
+            }
+            final LabelChip chip = createLabelChip(label);
+            addView(chip);
+            chipList.add(chip);
+        }
+    }
+
+    protected abstract LabelChip createLabelChip(@NonNull Label label);
+}