WindowServer+MouseSettings: Add ability to configure double-click speed (#5876)

This adds a double-click speed slider control to the Mouse Settings
panel, and value labels for both the movement speed and double-click
speed sliders.

To allow for updating and persisting the configured double-click
speed through the WindowServer, two IPC calls - `SetDoubleClickSpeed`
and `GetDoubleClickSpeed` - have been added.

1 files changed, 13 insertions, 0 deletions

diff --git a/Userland/Services/WindowServer/ClientConnection.cpp b/Userland/Services/WindowServer/ClientConnection.cpp
index 77ff8e1ab7..c49f8ad26d 100644
--- a/Userland/Services/WindowServer/ClientConnection.cpp
+++ b/Userland/Services/WindowServer/ClientConnection.cpp
@@ -966,6 +966,19 @@ OwnPtr<Messages::WindowServer::GetScrollStepSizeResponse> ClientConnection::hand
 {
     return make<Messages::WindowServer::GetScrollStepSizeResponse>(Screen::the().scroll_step_size());
 }
+OwnPtr<Messages::WindowServer::SetDoubleClickSpeedResponse> ClientConnection::handle(const Messages::WindowServer::SetDoubleClickSpeed& message)
+{
+    if (message.speed() < double_click_speed_min || message.speed() > double_click_speed_max) {
+        did_misbehave("SetDoubleClickSpeed with bad speed");
+        return {};
+    }
+    WindowManager::the().set_double_click_speed(message.speed());
+    return make<Messages::WindowServer::SetDoubleClickSpeedResponse>();
+}
+OwnPtr<Messages::WindowServer::GetDoubleClickSpeedResponse> ClientConnection::handle(const Messages::WindowServer::GetDoubleClickSpeed&)
+{
+    return make<Messages::WindowServer::GetDoubleClickSpeedResponse>(WindowManager::the().double_click_speed());
+}
 
 void ClientConnection::set_unresponsive(bool unresponsive)
 {