From 0d7d3665ee6cbf8b658dc276ce26dbaef6395785 Mon Sep 17 00:00:00 2001
From: ShootingStarDragons <ShootingStarDragons@protonmail.com>
Date: Fri, 4 Oct 2024 15:52:10 +0900
Subject: [PATCH] feat: try to support scale

---
 iced_layershell/src/application/state.rs  | 57 ++++++++++++++++++-----
 iced_layershell/src/event.rs              |  1 -
 iced_layershell/src/multi_window/state.rs | 10 ++++
 3 files changed, 56 insertions(+), 12 deletions(-)

diff --git a/iced_layershell/src/application/state.rs b/iced_layershell/src/application/state.rs
index 2a3ece3..8074fc4 100644
--- a/iced_layershell/src/application/state.rs
+++ b/iced_layershell/src/application/state.rs
@@ -11,6 +11,8 @@ where
     A::Theme: DefaultStyle,
 {
     scale_factor: f64,
+    window_size: iced::Size<u32>,
+    window_scale_factor: u32,
     viewport: Viewport,
     viewport_version: usize,
     theme: A::Theme,
@@ -28,13 +30,23 @@ where
         let theme = application.theme();
         let appearance = application.style(&theme);
 
-        let viewport = {
+        let window_scale_factor = 120;
+        let (window_size, viewport) = {
             let (width, height) = window.main_window().get_size();
 
-            Viewport::with_physical_size(iced_core::Size::new(width, height), 1. * scale_factor)
+            let realscale = window_scale_factor as f64 / 120.;
+            (
+                iced::Size::new(width, height),
+                Viewport::with_physical_size(
+                    iced_core::Size::new(width, height),
+                    realscale * scale_factor,
+                ),
+            )
         };
         Self {
             scale_factor,
+            window_size,
+            window_scale_factor,
             viewport,
             viewport_version: 0,
             theme,
@@ -48,11 +60,24 @@ where
         self.modifiers
     }
 
+    pub fn current_wayland_scale(&self) -> f64 {
+        self.window_scale_factor as f64 / 120.
+    }
+
     pub fn update_view_port(&mut self, width: u32, height: u32) {
+        self.window_size = iced::Size::new(width, height);
         self.viewport = Viewport::with_physical_size(
-            iced_core::Size::new(width, height),
-            1. * self.scale_factor(),
-        )
+            self.window_size(),
+            self.current_wayland_scale() * self.scale_factor,
+        );
+        self.viewport_version = self.viewport_version.wrapping_add(1);
+    }
+
+    fn window_size(&self) -> iced::Size<u32> {
+        let mut window_size = self.window_size;
+        window_size.width = window_size.width * 140 / self.window_scale_factor;
+        window_size.height = window_size.height * 140 / self.window_scale_factor;
+        window_size
     }
 
     pub fn viewport(&self) -> &Viewport {
@@ -67,10 +92,6 @@ where
         self.viewport.logical_size()
     }
 
-    pub fn scale_factor(&self) -> f64 {
-        self.viewport.scale_factor()
-    }
-
     pub fn text_color(&self) -> Color {
         self.appearance.text_color
     }
@@ -100,6 +121,18 @@ where
             WindowEvent::ModifiersChanged(modifiers) => {
                 self.modifiers = *modifiers;
             }
+            WindowEvent::ScaleFactorChanged {
+                scale_float,
+                scale_u32,
+            } => {
+                self.viewport = Viewport::with_physical_size(
+                    self.window_size(),
+                    self.scale_factor * scale_float,
+                );
+
+                self.viewport_version = self.viewport_version.wrapping_add(1);
+                self.window_scale_factor = *scale_u32;
+            }
             _ => {}
         }
     }
@@ -107,8 +140,10 @@ where
     pub fn synchronize(&mut self, application: &A) {
         let new_scale_factor = application.scale_factor();
         if self.scale_factor != new_scale_factor {
-            self.viewport =
-                Viewport::with_physical_size(self.physical_size(), 1. * new_scale_factor);
+            self.viewport = Viewport::with_physical_size(
+                self.window_size(),
+                self.current_wayland_scale() * new_scale_factor,
+            );
             self.viewport_version = self.viewport_version.wrapping_add(1);
             self.scale_factor = new_scale_factor;
         }
diff --git a/iced_layershell/src/event.rs b/iced_layershell/src/event.rs
index ef4356a..1d8dfec 100644
--- a/iced_layershell/src/event.rs
+++ b/iced_layershell/src/event.rs
@@ -188,7 +188,6 @@ impl<Message: 'static, INFO: Clone> From<&DispatchMessage> for IcedLayerEvent<Me
                     y: *y,
                 })
             }
-
             DispatchMessage::PreferredScale {
                 scale_u32,
                 scale_float,
diff --git a/iced_layershell/src/multi_window/state.rs b/iced_layershell/src/multi_window/state.rs
index 6cbb63a..6164b5b 100644
--- a/iced_layershell/src/multi_window/state.rs
+++ b/iced_layershell/src/multi_window/state.rs
@@ -102,6 +102,16 @@ where
             WindowEvent::ModifiersChanged(modifiers) => {
                 self.modifiers = *modifiers;
             }
+            WindowEvent::ScaleFactorChanged {
+                scale_float,
+                scale_u32: _,
+            } => {
+                let size = self.viewport.physical_size();
+
+                self.viewport = Viewport::with_physical_size(size, scale_float * self.scale_factor);
+
+                self.viewport_version = self.viewport_version.wrapping_add(1);
+            }
             _ => {}
         }
     }