examples: port to the new module system

CMake/vtkAndroid.cmake

@@ -31,7 +31,7 @@ set(ANDROID_NATIVE_API_LEVEL "21" CACHE STRING "Android Native API Level")
 set(ANDROID_ARCH_ABI "armeabi" CACHE STRING "Target Android architecture/abi")
 
 # find android
-if (BUILD_EXAMPLES)
+if (VTK_BUILD_EXAMPLES)
   find_program(ANDROID_EXECUTABLE
     NAMES android
     DOC   "The android command-line tool")
@@ -95,7 +95,7 @@ set(android_cmake_flags
   -DANT_EXECUTABLE:FILE=${ANT_EXECUTABLE}
   -DBUILD_SHARED_LIBS:BOOL=OFF
   -DBUILD_TESTING:BOOL=OFF
-  -DBUILD_EXAMPLES:BOOL=${BUILD_EXAMPLES}
+  -DVTK_BUILD_EXAMPLES:BOOL=${VTK_BUILD_EXAMPLES}
   -DVTK_RENDERING_BACKEND:STRING=OpenGL2
   -DVTK_Group_Rendering:BOOL=OFF
   -DVTK_Group_StandAlone:BOOL=OFF

CMake/vtkiOS.cmake

@@ -134,7 +134,7 @@ mark_as_advanced(Module_${vtk-module})
 set(ios_cmake_flags
   -DBUILD_SHARED_LIBS:BOOL=OFF
   -DBUILD_TESTING:BOOL=OFF
-  -DBUILD_EXAMPLES:BOOL=${BUILD_EXAMPLES}
+  -DVTK_BUILD_EXAMPLES:BOOL=${VTK_BUILD_EXAMPLES}
   -DVTK_USE_64BIT_IDS:BOOL=OFF
   -DVTK_Group_Rendering:BOOL=OFF
   -DVTK_Group_StandAlone:BOOL=OFF

CMakeLists.txt

@@ -66,7 +66,7 @@ include(vtkCompilerDynamicAnalysisFlags)
 
 #-----------------------------------------------------------------------------
 # Do we want examples built?
-option(BUILD_EXAMPLES "Build VTK examples." OFF)
+option(VTK_BUILD_EXAMPLES "Build VTK examples." OFF)
 
 set(VTK_BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS})
 
@@ -383,14 +383,15 @@ configure_file(
   "${CMAKE_CURRENT_BINARY_DIR}/CTestCustom.cmake"
   @ONLY)
 
+option(VTK_BUILD_EXAMPLES "Build VTK examples." OFF)
+if (VTK_BUILD_EXAMPLES)
+  add_subdirectory(Examples)
+endif ()
+
 if(BUILD_TESTING)
   add_subdirectory(Testing/Install)
 endif()
 
-if(BUILD_EXAMPLES)
-  add_subdirectory(Examples)
-endif()
-
 # The doxygen documentation needs to be aware of all modules.
 option(VTK_BUILD_DOCUMENTATION "Build the VTK documentation" OFF)
 if(VTK_BUILD_DOCUMENTATION)

Examples/Android/ReadMe.txt

@@ -43,7 +43,7 @@ To build VTK and these examples follow the steps below.
 
 If you want OpenGL ES 3.0 support make sure to change the setting of
 OPENGL_ES_VERSION to 3.0. Volume Rendering requires ES 3.0. Make sure to turn on
-BUILD_EXAMPLES
+VTK_BUILD_EXAMPLES
 
 * configure and generate as usual
 

Examples/CMakeLists.txt

-cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
+project(VTKExamples)
 
-PROJECT(VTKExamples)
-include_regular_expression("^.*$")
-
-if(NOT VTK_BINARY_DIR)
-  find_package(VTK REQUIRED)
-else()
-  set(VTK_DIR ${VTK_BINARY_DIR})
-  find_package(VTK REQUIRED)
-endif()
+if (VTK_BINARY_DIR)
+  function (add_example dir)
+    add_test(
+      NAME    "VTKExample-${dir}"
+      COMMAND "${CMAKE_CTEST_COMMAND}"
+              --build-generator
+                "${CMAKE_GENERATOR}"
+              --build-and-test
+                "${CMAKE_CURRENT_SOURCE_DIR}/${dir}"
+                "${CMAKE_CURRENT_BINARY_DIR}/${dir}"
+              --build-options
+                "-DBUILD_TESTING=ON"
+                "-DVTK_DIR=${vtk_cmake_build_dir}"
+              --test-command
+                "${CMAKE_CTEST_COMMAND}"
+                  -C $<CONFIGURATION>)
+  endfunction ()
+else ()
+  macro (add_example dir)
+    add_subdirectory("${dir}")
+  endmacro ()
+endif ()
 
 if (ANDROID)
   add_subdirectory(Android)

Examples/iOS/VTKViewer/README.md

@@ -38,7 +38,7 @@ path/to/VTK-iOS-build> ccmake -DVTK_IOS_BUILD=ON /path/to/VTK -G Ninja
 ```
 In `ccmake`, set the following options:
 ```
-BUILD_EXAMPLES = OFF
+VTK_BUILD_EXAMPLES = OFF
 BUILD_TESTING = OFF
 CMAKE_BUILD_TYPE = Release
 IOS_DEVICE_ARCHITECTURES = arm64;armv7

Testing/Core/ConfigSummary.txt.in

@@ -27,8 +27,8 @@ ConfigSummary = {
 "BUILD_TESTING":
 "@BUILD_TESTING@",
 
-"BUILD_EXAMPLES":
-"@BUILD_EXAMPLES@",
+"VTK_BUILD_EXAMPLES":
+"@VTK_BUILD_EXAMPLES@",
 
 "VTK_DEBUG_LEAKS":
 "@VTK_DEBUG_LEAKS@",