+char const *App::api_activate_surface(char const *drawing_name) {
+ ST();
+ auto const &surface_id = this->lookup_id(drawing_name);
+
+ if (!surface_id) {
+ return "Surface does not exist";
+ }
+
+ if (!this->controller->surface_exists(*surface_id)) {
+ return "Surface does not exist in controller!";
+ }
+
+ auto layer_id = this->layers.get_layer_id(*surface_id);
+
+ if (!layer_id) {
+ return "Surface is not on any layer!";
+ }
+
+ auto o_state = *this->layers.get_layout_state(*surface_id);
+
+ if (!o_state) {
+ return "Could not find layer for surface";
+ }
+
+ struct LayoutState &state = *o_state;
+
+ // disable layers that are above our current layer
+ for (auto const &l : this->layers.mapping) {
+ if (l.layer_id <= *layer_id) {
+ continue;
+ }
+
+ bool flush = false;
+ if (l.state.main != -1) {
+ this->deactivate(l.state.main);
+ l.state.main = -1;
+ flush = true;
+ }
+
+ if (l.state.sub != -1) {
+ this->deactivate(l.state.sub);
+ l.state.sub = -1;
+ flush = true;
+ }
+
+ l.state.s = LayoutState::Single;
+
+ if (flush) {
+ this->controller->commit_changes();
+ this->display->flush();
+ }
+ }
+
+ if (state.main == *surface_id || state.sub == *surface_id) {
+ return "Surface already active";
+ }
+
+ // This should involve a policy check, but as we do not (yet) have
+ // such a thing, we will just switch to this surface.
+ // XXX: input focus missing!!1
+
+ if (state.main == -1) {
+ this->emit_syncdraw(drawing_name);
+
+ this->surface_set_layout_full(*surface_id);
+ this->activate(*surface_id);
+ state.main = *surface_id;
+ state.sub = -1;
+ state.s = LayoutState::Single;
+
+ //////this->emit_flushdraw(drawing_name);
+ this->pending_end_draw.push_back(state.main);
+ } else {
+ bool can_split = this->can_split(state, *surface_id);
+
+ if (state.sub == -1) {
+ if (can_split) {
+ if (state.main != *surface_id) {
+ std::string main = std::move(*this->lookup_name(state.main));
+ this->emit_syncdraw(drawing_name);
+ this->emit_syncdraw(main.c_str());
+
+ this->surface_set_layout_split(state.main, *surface_id);
+ this->activate(*surface_id);
+ state.sub = *surface_id;
+
+ this->pending_end_draw.push_back(state.main);
+ this->pending_end_draw.push_back(state.sub);
+ // Should wait for EndDraw event...
+ //////this->emit_flushdraw(drawing_name);
+ //////this->emit_flushdraw(main.c_str());
+ }
+ } else {
+ this->emit_syncdraw(drawing_name);
+
+ this->surface_set_layout_full(*surface_id);
+ this->deactivate(state.main);
+ this->activate(*surface_id);
+ this->deactivate(state.sub);
+ state.main = *surface_id;
+ state.sub = -1;
+ state.s = LayoutState::Single;
+
+ //////this->emit_flushdraw(drawing_name);
+ this->pending_end_draw.push_back(state.main);
+ }
+ }
+ }
+
+ // commit changes
+ this->controller->commit_changes();
+ this->display->flush();
+
+ // no error
+ return nullptr;
+}
+
+char const *App::api_deactivate_surface(char const *drawing_name) {
+ ST();
+ auto const &surface_id = this->lookup_id(drawing_name);
+
+ if (!surface_id) {
+ return "Surface does not exist";
+ }
+
+ if (*surface_id == this->layers.main_surface) {
+ return "Cannot deactivate main_surface";
+ }
+
+ auto o_state = *this->layers.get_layout_state(*surface_id);
+
+ if (!o_state) {
+ return "Could not find layer for surface";
+ }
+
+ struct LayoutState &state = *o_state;
+
+ if (state.main == -1) {
+ return "No surface active";
+ }
+
+ if (*surface_id == this->layers.main_surface) {
+ logdebug("Refusing to deactivate main_surface %d", *surface_id);
+ return nullptr;
+ }
+
+ if (state.main == *surface_id) {
+ if (state.sub != -1) {
+ std::string sub = std::move(*this->lookup_name(state.sub));
+ this->emit_syncdraw(sub.c_str());
+
+ this->deactivate(*surface_id);
+ this->surface_set_layout_full(state.sub);
+ state.main = state.sub;
+ state.sub = -1;
+ state.s = LayoutState::Single;
+
+ //////this->emit_flushdraw(sub.c_str());
+ this->pending_end_draw.push_back(state.sub);
+ } else {
+ this->deactivate(*surface_id);
+ state.main = -1;
+ }
+ } else if (state.sub == *surface_id) {
+ std::string main = std::move(*this->lookup_name(state.main));
+ this->emit_syncdraw(main.c_str());
+
+ this->deactivate(*surface_id);
+ this->deactivate(*surface_id);
+ this->surface_set_layout_full(state.main);
+ state.sub = -1;
+ state.s = LayoutState::Single;
+
+ //////this->emit_flushdraw(main.c_str());
+ this->pending_end_draw.push_back(state.main);
+ } else {
+ return "Surface is not active";
+ }
+
+ this->controller->commit_changes();
+ this->display->flush();
+
+ return nullptr;