v2.5.0: improved text input performance regarding copy/paste

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/windows/WndTextInput.java

@@ -90,6 +90,18 @@ public class WndTextInput extends Window {
 				onSelect(true, getText());
 				hide();
 			}
+
+			@Override
+			public void onChanged() {
+				super.onChanged();
+				if (btnCopy != null) btnCopy.enable(!getText().isEmpty());
+			}
+
+			@Override
+			public void onClipBoardUpdate() {
+				super.onClipBoardUpdate();
+				btnPaste.enable(Gdx.app.getClipboard().hasContents());
+			}
 		};
 		if (initialValue != null) textBox.setText(initialValue);
 		textBox.setMaxLength(maxLength);
@@ -127,6 +139,7 @@ public class WndTextInput extends Window {
 			}
 		};
 		btnCopy.icon(Icons.COPY.get());
+		btnCopy.enable(!textBox.getText().isEmpty());
 		add(btnCopy);
 
 		btnPaste = new RedButton(""){
@@ -145,11 +158,16 @@ public class WndTextInput extends Window {
 			@Override
 			protected void onClick() {
 				super.onClick();
-				textBox.pasteFromClipboard();
+				if (Gdx.app.getClipboard().hasContents()) {
+					textBox.pasteFromClipboard();
+				} else {
+					enable(false);
+				}
 			}
 
 		};
 		btnPaste.icon(Icons.PASTE.get());
+		btnPaste.enable(Gdx.app.getClipboard().hasContents());
 		add(btnPaste);
 
 		btnCopy.setRect(textBoxWidth + 2*MARGIN, pos, BUTTON_HEIGHT, BUTTON_HEIGHT);
@@ -200,13 +218,6 @@ public class WndTextInput extends Window {
 
 	}
 
-	@Override
-	public synchronized void update() {
-		super.update();
-		btnCopy.enable(!textBox.getText().isEmpty());
-		btnPaste.enable(Gdx.app.getClipboard().hasContents());
-	}
-
 	@Override
 	public void offset(int xOffset, int yOffset) {
 		super.offset(xOffset, yOffset);