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restore cursor reliably even if previously unset

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This commit is contained in:
SlowRiot 2026-03-31 16:55:05 +01:00
parent 0454ffec27
commit 57c52e75b2
1 changed files with 9 additions and 11 deletions
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20
backends/imgui_impl_emscripten.cpp
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@ -248,14 +248,6 @@ void unset();
// Browser cursor helper implementation
bool is_set()
{
// Returns whether the cursor is currently set
return EM_ASM_INT(
return !(!document.body.style.cursor || document.body.style.cursor.length === 0 );
);
}
std::string get_string()
{
// Return the current cursor setting as a string
@ -273,6 +265,9 @@ void set(cursor new_cursor)
// Note, implementations omitted for cursors not used by imgui. For full implementation, use https://github.com/Armchair-Software/emscripten-browser-cursor
switch (new_cursor)
{
case cursor::none:
EM_ASM(document.body.style.cursor = 'none';);
break;
case cursor::cursor_default:
default:
EM_ASM(document.body.style.cursor = 'default';);
@ -345,13 +340,16 @@ void update_cursor(ImGui_ImplEmscripten_Data* bd)
// Sync any cursor changes due to ImGui to the browser's cursor
if (ImGui::GetIO().WantCaptureMouse) // mouse is hovering over the gui
{
if (!bd->CursorToRestore && emscripten_browser_cursor_internal::is_set())
if (!bd->CursorToRestore)
{
bd->CursorToRestore = emscripten_browser_cursor_internal::get_string(); // back up the existing cursor when entering the imgui capture space
bd->CursorToRestore = emscripten_browser_cursor_internal::get_string(); // back up the existing cursor state when entering the imgui capture space
}
switch (ImGui::GetMouseCursor())
{
case ImGuiMouseCursor_None:
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::none);
break;
case ImGuiMouseCursor_Arrow:
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::cursor_default);
break;
@ -385,7 +383,7 @@ void update_cursor(ImGui_ImplEmscripten_Data* bd)
{
if (bd->CursorToRestore)
{
emscripten_browser_cursor_internal::set(*bd->CursorToRestore); // restore the previous cursor when leaving the imgui capture space
emscripten_browser_cursor_internal::set(*bd->CursorToRestore); // restore the previous cursor state when leaving the imgui capture space
bd->CursorToRestore = std::nullopt;
bd->CurrentCursor = emscripten_browser_cursor_internal::cursor::invalid; // select an unused value for current cursor to force a set next time set_cursor_if_necessary is called
}