Separator ftxui::{screen,dom,component} into separate build unit.

examples/CMakeLists.txt

@@ -1,10 +1,7 @@
 cmake_minimum_required(VERSION 3.0)
 
-function(example name)
-  add_executable(${name} ${name}.cpp)
-  target_link_libraries(${name} PUBLIC ftxui)
-endfunction(example)
-
 add_subdirectory(component)
 add_subdirectory(dom)
-example(print_key_press)
+
+add_executable(print_key_press print_key_press.cpp)
+target_link_libraries(print_key_press PUBLIC component)

examples/component/CMakeLists.txt

@@ -1,3 +1,9 @@
+find_package(ftxui)
+function(example name)
+  add_executable(${name} ${name}.cpp)
+  target_link_libraries(${name} PUBLIC component)
+endfunction(example)
+
 example(input)
 example(menu)
 example(menu2)

examples/dom/CMakeLists.txt

@@ -1,3 +1,8 @@
+function(example name)
+  add_executable(${name} ${name}.cpp)
+  target_link_libraries(${name} PUBLIC dom)
+endfunction(example)
+
 example(blink)
 example(bold)
 example(color)