Impl cursor on sdl.

3 files changed, 65 insertions, 5 deletions

diff --git a/src/platform/gui/sdl/CMakeLists.txt b/src/platform/gui/sdl/CMakeLists.txt
index fa4a6397..fac9d859 100644
--- a/src/platform/gui/sdl/CMakeLists.txt
+++ b/src/platform/gui/sdl/CMakeLists.txt
@@ -1,5 +1,6 @@
 add_library(CruPlatformGuiSdl
 	Base.cpp
+	Cursor.cpp
 	Input.cpp
 	UiApplication.cpp
 	Window.cpp
diff --git a/src/platform/gui/sdl/Cursor.cpp b/src/platform/gui/sdl/Cursor.cpp
new file mode 100644
index 00000000..901c2bff
--- /dev/null
+++ b/src/platform/gui/sdl/Cursor.cpp
@@ -0,0 +1,48 @@
+#include "cru/platform/gui/sdl/Cursor.h"
+#include "cru/base/Base.h"
+#include "cru/platform/gui/Cursor.h"
+#include "cru/platform/gui/sdl/Base.h"
+
+#include <memory>
+
+namespace cru::platform::gui::sdl {
+std::shared_ptr<SdlCursor> SdlCursor::CreateSystem(SDL_SystemCursor cursor) {
+  auto c = SDL_CreateSystemCursor(cursor);
+  if (!c) {
+    throw SdlException("Failed to create system cursor.");
+  }
+  return std::make_shared<SdlCursor>(c, true);
+}
+
+SdlCursor::SdlCursor(SDL_Cursor* cursor, bool auto_destroy)
+    : cursor_(cursor), auto_destroy_(auto_destroy) {}
+
+SdlCursor::~SdlCursor() {
+  if (auto_destroy_) {
+    SDL_DestroyCursor(cursor_);
+  }
+}
+
+SDL_Cursor* SdlCursor::GetSdlCursor() { return cursor_; }
+
+SdlCursorManager::SdlCursorManager() {
+  arrow_cursor_ = SdlCursor::CreateSystem(SDL_SYSTEM_CURSOR_DEFAULT);
+  hand_cursor_ = SdlCursor::CreateSystem(SDL_SYSTEM_CURSOR_POINTER);
+  ibeam_cursor_ = SdlCursor::CreateSystem(SDL_SYSTEM_CURSOR_TEXT);
+}
+
+std::shared_ptr<ICursor> SdlCursorManager::GetSystemCursor(
+    SystemCursorType type) {
+  switch (type) {
+    case SystemCursorType::Arrow:
+      return std::static_pointer_cast<ICursor>(arrow_cursor_);
+    case SystemCursorType::Hand:
+      return std::static_pointer_cast<ICursor>(hand_cursor_);
+    case SystemCursorType::IBeam:
+      return std::static_pointer_cast<ICursor>(ibeam_cursor_);
+    default:
+      UnreachableCode();
+  }
+}
+
+}  // namespace cru::platform::gui::sdl
diff --git a/src/platform/gui/sdl/Window.cpp b/src/platform/gui/sdl/Window.cpp
index 3ab8cf4d..77cec606 100644
--- a/src/platform/gui/sdl/Window.cpp
+++ b/src/platform/gui/sdl/Window.cpp
@@ -1,10 +1,12 @@
 #include "cru/platform/gui/sdl/Window.h"
 #include "cru/base/Base.h"
+#include "cru/platform/Base.h"
 #include "cru/platform/GraphicsBase.h"
 #include "cru/platform/graphics/NullPainter.h"
 #include "cru/platform/graphics/Painter.h"
 #include "cru/platform/gui/Window.h"
 #include "cru/platform/gui/sdl/Base.h"
+#include "cru/platform/gui/sdl/Cursor.h"
 #include "cru/platform/gui/sdl/Input.h"
 #include "cru/platform/gui/sdl/UiApplication.h"
 
@@ -155,8 +157,10 @@ bool SdlWindow::ReleaseMouse() {
 }
 
 void SdlWindow::SetCursor(std::shared_ptr<ICursor> cursor) {
-  if (!sdl_window_) return;
-  NotImplemented();
+  cursor_ = std::move(cursor);
+  if (sdl_window_) {
+    DoUpdateCursor();
+  }
 }
 
 void SdlWindow::SetToForeground() {
@@ -225,9 +229,9 @@ void SdlWindow::DoCreateWindow() {
 
   CheckSdlReturn(
       SDL_SetWindowPosition(sdl_window_, client_rect_.left, client_rect_.top));
-  CheckSdlReturn(SDL_SetWindowParent(
-      sdl_window_, parent_ == nullptr ? nullptr : parent_->sdl_window_));
-  CheckSdlReturn(SDL_SyncWindow(sdl_window_));
+
+  DoUpdateParent();
+  DoUpdateCursor();
 }
 
 void SdlWindow::DoUpdateClientRect() {
@@ -259,6 +263,13 @@ void SdlWindow::DoUpdateTitle() {
   CheckSdlReturn(SDL_SyncWindow(sdl_window_));
 }
 
+void SdlWindow::DoUpdateCursor() {
+  assert(sdl_window_);
+  auto cursor = CheckPlatform<SdlCursor>(cursor_, GetPlatformId());
+  CheckSdlReturn(SDL_SetCursor(cursor->GetSdlCursor()));
+  CheckSdlReturn(SDL_SyncWindow(sdl_window_));
+}
+
 namespace {
 NativeMouseButtonEventArgs ConvertMouseButtonEvent(
     const SDL_MouseButtonEvent& event) {