From 44e0ebdab40f3e59ddeee0b7f06284cd96d5bee0 Mon Sep 17 00:00:00 2001
From: James <jselby@jselby.net>
Date: Mon, 24 Jun 2019 00:18:59 +1000
Subject: [PATCH] Implement basic dark mode

---
 src/frontend/rest/services/dark_mode.rs | 27 +++++++++++++++++++++++++
 src/frontend/rest/services/mod.rs       |  2 ++
 src/native/interop.cpp                  | 18 +++++++++++++++++
 src/native/mod.rs                       | 16 +++++++++++++++
 static/css/main.css                     |  5 +++++
 static/js/main.js                       | 12 +++++++++--
 6 files changed, 78 insertions(+), 2 deletions(-)
 create mode 100644 src/frontend/rest/services/dark_mode.rs

diff --git a/src/frontend/rest/services/dark_mode.rs b/src/frontend/rest/services/dark_mode.rs
new file mode 100644
index 0000000..bc6ef8a
--- /dev/null
+++ b/src/frontend/rest/services/dark_mode.rs
@@ -0,0 +1,27 @@
+//! frontend/rest/services/dark_mode.rs
+//!
+//! This call returns if dark mode is enabled on the system currently.
+
+use frontend::rest::services::default_future;
+use frontend::rest::services::Future;
+use frontend::rest::services::Request;
+use frontend::rest::services::Response;
+use frontend::rest::services::WebService;
+
+use hyper::header::{ContentLength, ContentType};
+
+use logging::LoggingErrors;
+
+use native::is_dark_mode_active;
+
+pub fn handle(_service: &WebService, _req: Request) -> Future {
+    let file = serde_json::to_string(&is_dark_mode_active())
+        .log_expect("Failed to render JSON payload of installation status object");
+
+    default_future(
+        Response::new()
+            .with_header(ContentLength(file.len() as u64))
+            .with_header(ContentType::json())
+            .with_body(file),
+    )
+}
diff --git a/src/frontend/rest/services/mod.rs b/src/frontend/rest/services/mod.rs
index c7ce3b8..df9ea28 100644
--- a/src/frontend/rest/services/mod.rs
+++ b/src/frontend/rest/services/mod.rs
@@ -23,6 +23,7 @@ use futures::sink::Sink;
 mod attributes;
 mod config;
 mod default_path;
+mod dark_mode;
 mod exit;
 mod install;
 mod installation_status;
@@ -131,6 +132,7 @@ impl Service for WebService {
         match (method, path.as_str()) {
             (Method::Get, "/api/attrs") => attributes::handle(self, req),
             (Method::Get, "/api/config") => config::handle(self, req),
+            (Method::Get, "/api/dark-mode") => dark_mode::handle(self, req),
             (Method::Get, "/api/default-path") => default_path::handle(self, req),
             (Method::Get, "/api/exit") => exit::handle(self, req),
             (Method::Get, "/api/packages") => packages::handle(self, req),
diff --git a/src/native/interop.cpp b/src/native/interop.cpp
index 9373d02..6320002 100644
--- a/src/native/interop.cpp
+++ b/src/native/interop.cpp
@@ -9,6 +9,24 @@
 #include "objidl.h"
 #include "shlguid.h"
 
+// https://stackoverflow.com/questions/52101827/windows-10-getsyscolor-does-not-get-dark-ui-color-theme
+extern "C" int isDarkThemeActive() {
+    DWORD   type;
+    DWORD   value;
+    DWORD   count = 4;
+    LSTATUS st = RegGetValue(
+        HKEY_CURRENT_USER,
+        TEXT("Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize"),
+        TEXT("AppsUseLightTheme"),
+        RRF_RT_REG_DWORD,
+        &type,
+        &value,
+        &count );
+    if ( st == ERROR_SUCCESS && type == REG_DWORD )
+        return value == 0;
+    return false;
+}
+
 extern "C" int saveShortcut(
     const char *shortcutPath,
     const char *description,
diff --git a/src/native/mod.rs b/src/native/mod.rs
index 54c9950..1c2cc0d 100644
--- a/src/native/mod.rs
+++ b/src/native/mod.rs
@@ -39,6 +39,8 @@ mod natives {
             args: *const ::std::os::raw::c_char,
             workingDir: *const ::std::os::raw::c_char,
         ) -> ::std::os::raw::c_int;
+
+        pub fn isDarkThemeActive() -> ::std::os::raw::c_uint;
     }
 
     // Needed here for Windows interop
@@ -201,6 +203,14 @@ mod natives {
 
         processes
     }
+
+    // Needed here for Windows interop
+    #[allow(unsafe_code)]
+    pub fn is_dark_mode_active() -> bool {
+        unsafe {
+            isDarkThemeActive() == 1
+        }
+    }
 }
 
 #[cfg(not(windows))]
@@ -307,6 +317,12 @@ mod natives {
         }
         processes // return running processes
     }
+
+    /// Returns if dark mode is active on this system.
+    pub fn is_dark_mode_active() -> bool {
+        // No-op
+        false
+    }
 }
 
 pub use self::natives::*;
diff --git a/static/css/main.css b/static/css/main.css
index bd6337b..2ca61a7 100644
--- a/static/css/main.css
+++ b/static/css/main.css
@@ -86,3 +86,8 @@ pre {
     padding: 20px;
     background: #fff;
 }
+
+/* Dark mode */
+body.has-background-black-ter .subtitle, body.has-background-black-ter .column > div {
+    color: hsl(0, 0%, 96%);
+}
diff --git a/static/js/main.js b/static/js/main.js
index 04fbdc9..6825c51 100644
--- a/static/js/main.js
+++ b/static/js/main.js
@@ -38,6 +38,13 @@ function disable_shortcuts(e) {
     }
 }
 
+// Check to see if we need to enable dark mode
+ajax("/api/dark-mode", function(enable) {
+    if (enable) {
+        document.body.classList.add("has-background-black-ter");
+    }
+});
+
 window.addEventListener("keydown", disable_shortcuts);
 
 document.getElementById("window-title").innerText = base_attributes.name + " Installer";
@@ -62,11 +69,12 @@ var app = new Vue({
     },
     methods: {
         "exit": function() {
-            ajax("/api/exit", function() {}, function(msg) {
+            /*ajax("/api/exit", function() {}, function(msg) {
                 alert("LiftInstall encountered and error while exiting: " + msg
                     + "\nPlease upload the log file (in the same directory as the installer) to " +
                     "the respective maintainers for this application (where you got it from!)");
-            });
+            });*/
+            window.close();
         }
     }
 }).$mount("#app");