widgets:new_document: add swap button to dims

add a button to swap dimensions, essentially changing between portrait
and landscape mode much more easily

[edit]
disabled when infinite is selected.

Signed-off-by: Niv Sardi <xaiki@evilgiggle.com>

Author: xaiki

editor/src/messages/dialog/new_document_dialog/new_document_dialog_message.rs

@@ -7,6 +7,7 @@ pub enum NewDocumentDialogMessage {
 	Infinite { infinite: bool },
 	DimensionsX { width: f64 },
 	DimensionsY { height: f64 },
+	SwapDimensions,
 
 	Submit,
 }

editor/src/messages/dialog/new_document_dialog/new_document_dialog_message_handler.rs

@@ -21,6 +21,9 @@ impl MessageHandler<NewDocumentDialogMessage, ()> for NewDocumentDialogMessageHa
 			NewDocumentDialogMessage::Infinite { infinite } => self.infinite = infinite,
 			NewDocumentDialogMessage::DimensionsX { width } => self.dimensions.x = width as u32,
 			NewDocumentDialogMessage::DimensionsY { height } => self.dimensions.y = height as u32,
+			NewDocumentDialogMessage::SwapDimensions => {
+				std::mem::swap(&mut self.dimensions.x, &mut self.dimensions.y);
+			}
 			NewDocumentDialogMessage::Submit => {
 				responses.add(PortfolioMessage::NewDocumentWithName { name: self.name.clone() });
 
@@ -132,6 +135,12 @@ impl LayoutHolder for NewDocumentDialogMessageHandler {
 				.on_update(|number_input: &NumberInput| NewDocumentDialogMessage::DimensionsX { width: number_input.value.unwrap() }.into())
 				.widget_instance(),
 			Separator::new(SeparatorStyle::Related).widget_instance(),
+			IconButton::new("SwapHorizontal", 16)
+			    .tooltip_label("Swap Width/Height")
+                .disabled(self.infinite)
+				.on_update(|_| NewDocumentDialogMessage::SwapDimensions.into())
+				.widget_instance(),
+			Separator::new(SeparatorStyle::Related).widget_instance(),
 			NumberInput::new(Some(self.dimensions.y as f64))
 				.label("H")
 				.unit(" px")