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optimise browser cursor original state save and restore

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This commit is contained in:
SlowRiot 2026-04-02 23:13:24 +01:00
parent b452984bca
commit 106660b527
1 changed files with 30 additions and 27 deletions
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57
backends/imgui_impl_emscripten.cpp
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@ -412,10 +412,20 @@ void ImGui_ImplEmscripten_Shutdown()
namespace {
void set_cursor_if_necessary(emscripten_browser_cursor_internal::cursor& current_cursor, emscripten_browser_cursor_internal::cursor new_cursor)
void restore_cursor_if_necessary(ImGui_ImplEmscripten_Data* bd)
{
if (new_cursor == current_cursor) return; // don't do anything if the current cursor is already set
current_cursor = new_cursor;
if (bd->CursorToRestore == nullptr) return;
emscripten_browser_cursor_internal::set(bd->CursorToRestore); // restore the previous cursor state when leaving imgui cursor ownership
free(bd->CursorToRestore);
bd->CursorToRestore = nullptr;
bd->CurrentCursor = emscripten_browser_cursor_internal::cursor::invalid; // select an unused value for current cursor to force a set next time
}
void set_cursor_if_necessary(ImGui_ImplEmscripten_Data* bd, emscripten_browser_cursor_internal::cursor new_cursor)
{
if (new_cursor == bd->CurrentCursor) return; // don't do anything if the current cursor is already set
if (bd->CursorToRestore == nullptr) bd->CursorToRestore = emscripten_browser_cursor_internal::get_string(); // back up the existing cursor state when first taking cursor ownership
bd->CurrentCursor = new_cursor;
emscripten_browser_cursor_internal::set(new_cursor);
}
@ -423,64 +433,57 @@ void update_cursor(ImGui_ImplEmscripten_Data* bd)
{
// Sync any cursor changes due to ImGui to the browser's cursor
ImGuiIO& io{ImGui::GetIO()};
if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) return;
if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
{
restore_cursor_if_necessary(bd);
return;
}
if (io.MouseDrawCursor) // hide the cursor for the entire window if imgui is handling cursor drawing - not just when imgui wants to capture the mouse
{
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::none);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::none);
return;
}
if (io.WantCaptureMouse) // mouse is hovering over the gui
{
if (bd->CursorToRestore == nullptr)
{
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);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::none);
break;
case ImGuiMouseCursor_Arrow:
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::cursor_default);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::cursor_default);
break;
case ImGuiMouseCursor_TextInput: // When hovering over InputText, etc.
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::text);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::text);
break;
case ImGuiMouseCursor_ResizeAll: // (Unused by Dear ImGui functions)
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::move);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::move);
break;
case ImGuiMouseCursor_ResizeNS: // When hovering over a horizontal border
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::ns_resize);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::ns_resize);
break;
case ImGuiMouseCursor_ResizeEW: // When hovering over a vertical border or a column
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::ew_resize);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::ew_resize);
break;
case ImGuiMouseCursor_ResizeNESW: // When hovering over the bottom-left corner of a window
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::nesw_resize);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::nesw_resize);
break;
case ImGuiMouseCursor_ResizeNWSE: // When hovering over the bottom-right corner of a window
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::nwse_resize);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::nwse_resize);
break;
case ImGuiMouseCursor_Hand: // (Unused by Dear ImGui functions. Use for e.g. hyperlinks)
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::pointer);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::pointer);
break;
case ImGuiMouseCursor_NotAllowed: // When hovering something with disallowed interaction. Usually a crossed circle.
set_cursor_if_necessary(bd->CurrentCursor, emscripten_browser_cursor_internal::cursor::not_allowed);
set_cursor_if_necessary(bd, emscripten_browser_cursor_internal::cursor::not_allowed);
break;
}
}
else // mouse is away from the gui, hovering over some other part of the viewport
{
if (bd->CursorToRestore != nullptr)
{
emscripten_browser_cursor_internal::set(bd->CursorToRestore); // restore the previous cursor state when leaving the imgui capture space
free(bd->CursorToRestore);
bd->CursorToRestore = nullptr;
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
}
restore_cursor_if_necessary(bd);
}
}