Merge branch 'dev_clickable_links_hold_to_copy'

mastodon/src/main/java/org/joinmastodon/android/ui/text/ClickableLinksDelegate.java

@@ -1,36 +1,83 @@
 package org.joinmastodon.android.ui.text;
 
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.CornerPathEffect;
 import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.Rect;
 import android.graphics.RectF;
+import android.os.Build;
 import android.text.Layout;
 import android.text.Spanned;
+import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.SoundEffectConstants;
 import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+
+import org.joinmastodon.android.R;
 
 import me.grishka.appkit.utils.V;
 
 public class ClickableLinksDelegate {
 
-	private Paint hlPaint;
+	private final Paint hlPaint;
 	private Path hlPath;
 	private LinkSpan selectedSpan;
-	private TextView view;
-	
+	private final TextView view;
+
+	private final GestureDetector gestureDetector;
+
 	public ClickableLinksDelegate(TextView view) {
 		this.view=view;
 		hlPaint=new Paint();
 		hlPaint.setAntiAlias(true);
 		hlPaint.setPathEffect(new CornerPathEffect(V.dp(3)));
 //        view.setHighlightColor(view.getResources().getColor(android.R.color.holo_blue_light));
+		gestureDetector = new GestureDetector(view.getContext(), new LinkGestureListener(), view.getHandler());
 	}
 
 	public boolean onTouch(MotionEvent event) {
-		if(event.getAction()==MotionEvent.ACTION_DOWN){
+		if(event.getAction()==MotionEvent.ACTION_CANCEL){
+			// the gestureDetector does not provide a callback for CANCEL, therefore:
+			// remove background color of view before passing event to gestureDetector
+			resetAndInvalidate();
+		}
+		return gestureDetector.onTouchEvent(event);
+	}
+
+	/**
+	 * remove highlighting from span and let the system redraw the view
+	 */
+	private void resetAndInvalidate() {
+		hlPath=null;
+		selectedSpan=null;
+		view.invalidate();
+	}
+
+	public void onDraw(Canvas canvas){
+		if(hlPath!=null){
+			canvas.save();
+			canvas.translate(0, view.getPaddingTop());
+			canvas.drawPath(hlPath, hlPaint);
+			canvas.restore();
+		}
+	}
+
+	/**
+	 * GestureListener for spans that represent URLs.
+	 * onDown: on start of touch event, set highlighting
+	 * onSingleTapUp: when there was a (short) tap, call onClick and reset highlighting
+	 * onLongPress: copy URL to clipboard, let user know, reset highlighting
+	 */
+	private class LinkGestureListener extends GestureDetector.SimpleOnGestureListener {
+		@Override
+		public boolean onDown(@NonNull MotionEvent event) {
 			int line=-1;
 			Rect rect=new Rect();
 			Layout l=view.getLayout();
@@ -45,8 +92,7 @@ public class ClickableLinksDelegate {
 				return false;
 			}
 			CharSequence text=view.getText();
-			if(text instanceof Spanned){
-				Spanned s=(Spanned)text;
+			if(text instanceof Spanned s){
 				LinkSpan[] spans=s.getSpans(0, s.length()-1, LinkSpan.class);
 				if(spans.length>0){
 					for(LinkSpan span:spans){
@@ -88,31 +134,35 @@ public class ClickableLinksDelegate {
 					}
 				}
 			}
+			return super.onDown(event);
 		}
-		if(event.getAction()==MotionEvent.ACTION_UP && selectedSpan!=null){
-			view.playSoundEffect(SoundEffectConstants.CLICK);
-			selectedSpan.onClick(view.getContext());
-			hlPath=null;
-			selectedSpan=null;
-			view.invalidate();
-			return false;
-		}
-		if(event.getAction()==MotionEvent.ACTION_CANCEL){
-			hlPath=null;
-			selectedSpan=null;
-			view.invalidate();
-			return false;
-		}
-		return false;
-	}
-	
-	public void onDraw(Canvas canvas){
-		if(hlPath!=null){
-			canvas.save();
-			canvas.translate(0, view.getPaddingTop());
-			canvas.drawPath(hlPath, hlPaint);
-			canvas.restore();
-		}
-	}
 
+		@Override
+		public boolean onSingleTapUp(@NonNull MotionEvent event) {
+			if(selectedSpan!=null){
+				view.playSoundEffect(SoundEffectConstants.CLICK);
+				selectedSpan.onClick(view.getContext());
+				resetAndInvalidate();
+				return true;
+			}
+			return false;
+		}
+
+		@Override
+		public void onLongPress(@NonNull MotionEvent event) {
+			//if target is not a link, don't copy
+			if (selectedSpan == null) return;
+			if (selectedSpan.getType() != LinkSpan.Type.URL) return;
+			//copy link text to clipboard
+			ClipboardManager clipboard = (ClipboardManager) view.getContext().getSystemService(Context.CLIPBOARD_SERVICE);
+			clipboard.setPrimaryClip(ClipData.newPlainText("", selectedSpan.getLink()));
+			//show toast, android from S_V2 on has built-in popup, as documented in
+			//https://developer.android.com/develop/ui/views/touch-and-input/copy-paste#duplicate-notifications
+			if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.S_V2) {
+				Toast.makeText(view.getContext(), R.string.text_copied, Toast.LENGTH_SHORT).show();
+			}
+			//reset view
+			resetAndInvalidate();
+		}
+	}
 }