1 files changed, 63 insertions, 0 deletions
diff --git a/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/attachments/AttachmentImageView.java b/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/attachments/AttachmentImageView.java
new file mode 100644
index 000000000..38c6209f3
--- /dev/null
+++ b/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/attachments/AttachmentImageView.java
@@ -0,0 +1,63 @@
+package it.niedermann.nextcloud.deck.ui.card.attachments;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.otaliastudios.zoom.ZoomImageView;
+
+public class AttachmentImageView extends ZoomImageView {
+    public AttachmentImageZoomListener zoomListener;
+    private GestureDetector gestureDetector;
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+
+        gestureDetector = new GestureDetector(getContext(), new GestureListener());
+
+        if (getContext() instanceof AttachmentImageZoomListener) {
+            this.zoomListener = (AttachmentImageZoomListener) getContext();
+        } else {
+            throw new ClassCastException("Caller must implement " + AttachmentImageZoomListener.class.getCanonicalName());
+        }
+    }
+
+    public AttachmentImageView(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @SuppressLint("ClickableViewAccessibility")
+    @Override
+    public boolean onTouchEvent(@NonNull MotionEvent ev) {
+        int pointerCount = ev.getPointerCount();
+
+        boolean canChange = pointerCount == 1 && getZoom() <= 1;
+        zoomListener.onAbleToChangePage(canChange);
+
+        gestureDetector.onTouchEvent(ev);
+
+        return super.onTouchEvent(ev);
+    }
+
+    private class GestureListener extends GestureDetector.SimpleOnGestureListener {
+
+        @Override
+        public boolean onDown(MotionEvent e) {
+            return true;
+        }
+
+        @Override
+        public boolean onDoubleTap(MotionEvent e) {
+            float zoomLevel = 2;
+            zoomTo(getZoom() < zoomLevel ? zoomLevel : 1, true);
+
+            return true;
+        }
+    }
+}