From 270c08a030bf359c608114e9b008bf8f551f7a8b Mon Sep 17 00:00:00 2001
From: Unknown <55922348+55nknown@users.noreply.github.com>
Date: Wed, 2 Feb 2022 16:47:27 +0100
Subject: [PATCH] min and max window size (#1171)

---
 egui-winit/src/epi.rs | 22 ++++++++++++++++++----
 epi/src/lib.rs        |  8 ++++++++
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/egui-winit/src/epi.rs b/egui-winit/src/epi.rs
index f9eeaece..995d8f8b 100644
--- a/egui-winit/src/epi.rs
+++ b/egui-winit/src/epi.rs
@@ -1,3 +1,13 @@
+use egui::Vec2;
+use winit::dpi::LogicalSize;
+
+pub fn points_to_size(points: Vec2) -> LogicalSize<f64> {
+    winit::dpi::LogicalSize {
+        width: points.x as f64,
+        height: points.y as f64,
+    }
+}
+
 pub fn window_builder(
     native_options: &epi::NativeOptions,
     window_settings: &Option<crate::WindowSettings>,
@@ -12,6 +22,13 @@ pub fn window_builder(
         .with_transparent(native_options.transparent)
         .with_window_icon(window_icon);
 
+    if let Some(min_size) = native_options.min_window_size {
+        window_builder = window_builder.with_min_inner_size(points_to_size(min_size));
+    }
+    if let Some(max_size) = native_options.max_window_size {
+        window_builder = window_builder.with_max_inner_size(points_to_size(max_size));
+    }
+
     window_builder =
         window_builder_drag_and_drop(window_builder, native_options.drag_and_drop_support);
 
@@ -20,10 +37,7 @@ pub fn window_builder(
     if let Some(window_settings) = window_settings {
         window_builder = window_settings.initialize_window(window_builder);
     } else if let Some(initial_size_points) = initial_size_points {
-        window_builder = window_builder.with_inner_size(winit::dpi::LogicalSize {
-            width: initial_size_points.x as f64,
-            height: initial_size_points.y as f64,
-        });
+        window_builder = window_builder.with_inner_size(points_to_size(initial_size_points));
     }
 
     window_builder
diff --git a/epi/src/lib.rs b/epi/src/lib.rs
index bc1b5ea1..1183cc06 100644
--- a/epi/src/lib.rs
+++ b/epi/src/lib.rs
@@ -233,6 +233,12 @@ pub struct NativeOptions {
     /// The initial size of the native window in points (logical pixels).
     pub initial_window_size: Option<egui::Vec2>,
 
+    /// The minimum window size
+    pub min_window_size: Option<egui::Vec2>,
+
+    /// The maximum window size
+    pub max_window_size: Option<egui::Vec2>,
+
     /// Should the app window be resizable?
     pub resizable: bool,
 
@@ -251,6 +257,8 @@ impl Default for NativeOptions {
             drag_and_drop_support: false,
             icon_data: None,
             initial_window_size: None,
+            min_window_size: None,
+            max_window_size: None,
             resizable: true,
             transparent: false,
         }