From 4c739480687e447f84fa5b3b321b005073a234e9 Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Tue, 7 Jan 2025 10:31:17 +0100
Subject: [PATCH] feat(win32 gui): send terminal background updates to gui

---
 src/renderer/win32/renderer.zig | 7 +------
 src/win32/gui.zig               | 6 ++++++
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/renderer/win32/renderer.zig b/src/renderer/win32/renderer.zig
index c82fe73..234c2f4 100644
--- a/src/renderer/win32/renderer.zig
+++ b/src/renderer/win32/renderer.zig
@@ -331,12 +331,7 @@ fn set_terminal_title_internal(self: *Self) void {
 
 pub fn set_terminal_style(self: *Self, style_: Style) void {
     _ = self;
-    _ = style_;
-    std.log.warn("TODO: implement set_terminal_style", .{});
-    //if (style_.fg) |color|
-    //self.vx.setTerminalForegroundColor(self.tty.anyWriter(), vaxis.Cell.Color.rgbFromUint(@intCast(color.color)).rgb) catch {};
-    //if (style_.bg) |color|
-    //self.vx.setTerminalBackgroundColor(self.tty.anyWriter(), vaxis.Cell.Color.rgbFromUint(@intCast(color.color)).rgb) catch {};
+    if (style_.bg) |color| gui.set_window_background(@intCast(color.color));
 }
 
 pub fn set_terminal_cursor_color(self: *Self, color: Color) void {
diff --git a/src/win32/gui.zig b/src/win32/gui.zig
index 656fbff..3d24c94 100644
--- a/src/win32/gui.zig
+++ b/src/win32/gui.zig
@@ -17,6 +17,7 @@ const windowmsg = @import("windowmsg.zig");
 const HResultError = ddui.HResultError;
 
 const WM_APP_EXIT = win32.WM_APP + 1;
+const WM_APP_SET_BACKGROUND = win32.WM_APP + 2;
 
 pub const DropWriter = struct {
     pub const WriteError = error{};
@@ -500,6 +501,11 @@ pub fn set_window_title(title: [*:0]const u16) error{ NoWindow, Win32 }!void {
     }
 }
 
+pub fn set_window_background(color: u32) void {
+    const hwnd = global.hwnd orelse return;
+    _ = win32.SendMessageW(hwnd, WM_APP_SET_BACKGROUND, color, 0);
+}
+
 // returns false if there is no hwnd
 pub fn updateScreen(screen: *const vaxis.Screen) bool {
     global.mutex.lock();