feat(options): set default save format

Avoid false data-loss warnings when preserving the source format.\n\nCloses #529

src/ui/window/mod.rs

@@ -6,5 +6,6 @@ pub mod shortcuts;
 pub mod layers;
 pub mod update_notice;
 pub mod open_progress;
+pub mod options;
 pub mod attribute_editor;
 pub mod alias_editor;

src/ui/window/options.rs

@@ -0,0 +1,98 @@
+use crate::app::Message;
+use iced::widget::{button, column, container, pick_list, row, text, Space};
+use iced::{Background, Border, Color, Element, Fill, Theme};
+
+pub fn view_window<'a>(default_save_format: &'a str) -> Element<'a, Message> {
+    const BG: Color = Color {
+        r: 0.15,
+        g: 0.15,
+        b: 0.17,
+        a: 1.0,
+    };
+    const BORDER: Color = Color {
+        r: 0.32,
+        g: 0.32,
+        b: 0.36,
+        a: 1.0,
+    };
+    const TEXT: Color = Color {
+        r: 0.90,
+        g: 0.90,
+        b: 0.90,
+        a: 1.0,
+    };
+    const DIM: Color = Color {
+        r: 0.60,
+        g: 0.60,
+        b: 0.64,
+        a: 1.0,
+    };
+
+    let selected = crate::io::SAVE_FORMAT_OPTIONS
+        .iter()
+        .copied()
+        .find(|candidate| *candidate == default_save_format);
+
+    let close = button(text("Close").size(12).color(TEXT))
+        .on_press(Message::CloseModal)
+        .padding([5, 16])
+        .style(|_: &Theme, status| button::Style {
+            background: Some(Background::Color(match status {
+                button::Status::Hovered | button::Status::Pressed => Color {
+                    r: 0.34,
+                    g: 0.34,
+                    b: 0.38,
+                    a: 1.0,
+                },
+                _ => Color {
+                    r: 0.26,
+                    g: 0.26,
+                    b: 0.29,
+                    a: 1.0,
+                },
+            })),
+            text_color: TEXT,
+            border: Border {
+                color: BORDER,
+                width: 1.0,
+                radius: 4.0.into(),
+            },
+            ..Default::default()
+        });
+
+    let body = column![
+        text("Open and Save").size(15).color(TEXT),
+        Space::new().height(16),
+        row![
+            text("Default save format:").size(12).color(TEXT).width(150),
+            pick_list(crate::io::SAVE_FORMAT_OPTIONS, selected, |format: &str| {
+                Message::DefaultSaveFormatChanged(format.to_string())
+            })
+            .width(Fill),
+        ]
+        .spacing(12)
+        .align_y(iced::Center),
+        Space::new().height(10),
+        text(
+            "Used when a new drawing is saved for the first time. Existing drawings keep their current file type and version."
+        )
+        .size(11)
+        .color(DIM)
+        .width(Fill),
+        Space::new().height(Fill),
+        row![Space::new().width(Fill), close],
+    ]
+    .spacing(0)
+    .width(Fill)
+    .height(Fill);
+
+    container(body)
+        .style(|_: &Theme| container::Style {
+            background: Some(Background::Color(BG)),
+            ..Default::default()
+        })
+        .padding([16, 18])
+        .width(Fill)
+        .height(Fill)
+        .into()
+}