Intercepting Paste Events

[Alch-Emi]

I'm trying to write an app which includes custom behavior for pasting, and especially multi-line pasting. It's fairly easy to listen for a Ctr+V event, check if a relevant input is selected, grab the clipboard, and then run the custom behavior.

However, by the time the message reaches my code, the UI will have already filled the widget with the text clipboard. I can work around this by just guessing the length of the pasted text (i think it's just the text length - the # of newlines) and truncating the text in the UI, but this feels a little messy.

It would be nice to be able to intercept a paste event, maybe by setting a property on the TextInput component that produces a Message instead of pasting text, or just disabling pasting into the TextInput.

[brightly-salty]

Just a possible solution, not a permanent one: you could copy the code of this file and remove the linked lines to create a widget which doesn't handle pasting, or just insert your custom logic into that area

iced/native/src/widget/text_input.rs

Lines 680 to 710 in 5466d6a

	keyboard::KeyCode::V => {
	if self.state.keyboard_modifiers.command() {
	let content = match self.state.is_pasting.take() {
	Some(content) => content,
	None => {
	let content: String = clipboard
	.read()
	.unwrap_or(String::new())
	.chars()
	.filter(|c| !c.is_control())
	.collect();
	Value::new(&content)
	}
	};
	let mut editor = Editor::new(
	&mut self.value,
	&mut self.state.cursor,
	);
	editor.paste(content.clone());
	let message = (self.on_change)(editor.contents());
	shell.publish(message);
	self.state.is_pasting = Some(content);
	} else {
	self.state.is_pasting = None;
	}
	}

[Alch-Emi]

ooh that's handy, thank you!

…

On Fri, Dec 31 2021 at 01:33:17 PM -0800, Caden Haustein ***@***.***> wrote: Just a possible solution, not a permanent one: you could copy the code of this file and remove the linked lines to create a widget which doesn't handle pasting, or just insert your custom logic into that area <https://github.com/iced-rs/iced/blob/5466d6a11d0a4bee01e954b7c727b3fd67cea02a/native/src/widget/text_input.rs#L680-L710> — Reply to this email directly, view it on GitHub <#1177 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJIYMMPRKDXFVCHXZDTGMADUTYOR3ANCNFSM5LBV4UIA>. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[hecrj]

We could extend the TextInput widget with additional methods to override paste behavior.

Could you elaborate a bit on your use case? Do you want to simply perform a transformation on the pasted text?

[Alch-Emi]

Sorry I didn't get back to this sooner! The project I'm working on is displaying several lines of text in a context where it makes sense to use individual, single-line text inputs. However, I'd like the user to be able to do a multi-line paste, so I'm trying to fudge it a little bit by intercepting the paste and breaking up the text between lines.

That said, I could definitely see this being used in other usecases where transformations might need to be applied as well.