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overlay: fix how input is handled when window loses focus (#632)

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## Link to GitHub Issue or related Pull Request, if one exists
#286 

## Description of change
When we migrated to event-based I/O for ImGui, it introduced an issue
where a button would be held down even when the window is not in focus,
because we didn't notify ImGui that the button was released (after the
window lost focus).

Fix the ImGui custom I/O handler so that it immediately releases all
buttons when the window focus is lost.

## Testing
tested on 32-bit windowed mode
This commit is contained in:
bicarus
2026-04-12 04:44:46 -07:00
committed by GitHub
parent 9936088286
commit 440b9ed749
1 changed files with 8 additions and 7 deletions
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src/spice2x/overlay/imgui/impl_spice.cpp
+8 -7
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@@ -349,6 +349,10 @@ void ImGui_ImplSpice_NewFrame() {
io.DeltaTime = (float) (current_time - g_Time) / g_TicksPerSecond;
g_Time = current_time;
// only process new input from devices if window is in focus
// (when not in focus, all mouse/keyboard events are treated as released)
const auto accept_new_input = superexit::has_focus() && !rawinput::OS_WINDOW_ACTIVE;
// remember old state
std::array<BYTE, VKEY_MAX> KeysDownOld;
for (size_t i = 0; i < VKEY_MAX; i++) {
@@ -361,11 +365,6 @@ void ImGui_ImplSpice_NewFrame() {
g_MouseDown.fill(false);
g_KeysDown.fill(false);
// early quit if window not in focus
if (!superexit::has_focus() || rawinput::OS_WINDOW_ACTIVE) {
return;
}
// apply windows mouse buttons
g_MouseDown[ImGuiMouseButton_Left] |= (get_async_primary_mouse()) != 0;
g_MouseDown[ImGuiMouseButton_Right] |= (get_async_secondary_mouse()) != 0;
@@ -374,7 +373,7 @@ void ImGui_ImplSpice_NewFrame() {
// read new keys state
static long mouse_wheel_last = 0;
long mouse_wheel = 0;
if (RI_MGR != nullptr) {
if (RI_MGR != nullptr && accept_new_input) {
auto devices = RI_MGR->devices_get();
for (auto &device : devices) {
switch (device.type) {
@@ -471,7 +470,9 @@ void ImGui_ImplSpice_NewFrame() {
// update OS mouse position
const auto old_mouse_pos = io.MousePos;
ImGui_ImplSpice_UpdateMousePos();
if (accept_new_input) {
ImGui_ImplSpice_UpdateMousePos();
}
const auto new_mouse_pos = io.MousePos;
// update mouse buttons