in shell/platform/windows/text_input_plugin.cc [160:321]
void TextInputPlugin::HandleMethodCall(
const flutter::MethodCall<rapidjson::Document>& method_call,
std::unique_ptr<flutter::MethodResult<rapidjson::Document>> result) {
const std::string& method = method_call.method_name();
if (method.compare(kShowMethod) == 0 || method.compare(kHideMethod) == 0) {
// These methods are no-ops.
} else if (method.compare(kClearClientMethod) == 0) {
if (active_model_ != nullptr && active_model_->composing()) {
active_model_->CommitComposing();
active_model_->EndComposing();
SendStateUpdate(*active_model_);
}
delegate_->OnResetImeComposing();
active_model_ = nullptr;
} else if (method.compare(kSetClientMethod) == 0) {
if (!method_call.arguments() || method_call.arguments()->IsNull()) {
result->Error(kBadArgumentError, "Method invoked without args");
return;
}
const rapidjson::Document& args = *method_call.arguments();
const rapidjson::Value& client_id_json = args[0];
const rapidjson::Value& client_config = args[1];
if (client_id_json.IsNull()) {
result->Error(kBadArgumentError, "Could not set client, ID is null.");
return;
}
if (client_config.IsNull()) {
result->Error(kBadArgumentError,
"Could not set client, missing arguments.");
return;
}
client_id_ = client_id_json.GetInt();
input_action_ = "";
auto input_action_json = client_config.FindMember(kTextInputAction);
if (input_action_json != client_config.MemberEnd() &&
input_action_json->value.IsString()) {
input_action_ = input_action_json->value.GetString();
}
input_type_ = "";
auto input_type_info_json = client_config.FindMember(kTextInputType);
if (input_type_info_json != client_config.MemberEnd() &&
input_type_info_json->value.IsObject()) {
auto input_type_json =
input_type_info_json->value.FindMember(kTextInputTypeName);
if (input_type_json != input_type_info_json->value.MemberEnd() &&
input_type_json->value.IsString()) {
input_type_ = input_type_json->value.GetString();
}
}
active_model_ = std::make_unique<TextInputModel>();
} else if (method.compare(kSetEditingStateMethod) == 0) {
if (!method_call.arguments() || method_call.arguments()->IsNull()) {
result->Error(kBadArgumentError, "Method invoked without args");
return;
}
const rapidjson::Document& args = *method_call.arguments();
if (active_model_ == nullptr) {
result->Error(
kInternalConsistencyError,
"Set editing state has been invoked, but no client is set.");
return;
}
auto text = args.FindMember(kTextKey);
if (text == args.MemberEnd() || text->value.IsNull()) {
result->Error(kBadArgumentError,
"Set editing state has been invoked, but without text.");
return;
}
auto base = args.FindMember(kSelectionBaseKey);
auto extent = args.FindMember(kSelectionExtentKey);
if (base == args.MemberEnd() || base->value.IsNull() ||
extent == args.MemberEnd() || extent->value.IsNull()) {
result->Error(kInternalConsistencyError,
"Selection base/extent values invalid.");
return;
}
// Flutter uses -1/-1 for invalid; translate that to 0/0 for the model.
int selection_base = base->value.GetInt();
int selection_extent = extent->value.GetInt();
if (selection_base == -1 && selection_extent == -1) {
selection_base = selection_extent = 0;
}
active_model_->SetText(text->value.GetString());
active_model_->SetSelection(TextRange(selection_base, selection_extent));
base = args.FindMember(kComposingBaseKey);
extent = args.FindMember(kComposingExtentKey);
if (base == args.MemberEnd() || base->value.IsNull() ||
extent == args.MemberEnd() || extent->value.IsNull()) {
result->Error(kInternalConsistencyError,
"Composing base/extent values invalid.");
return;
}
int composing_base = base->value.GetInt();
int composing_extent = base->value.GetInt();
if (composing_base == -1 && composing_extent == -1) {
active_model_->EndComposing();
} else {
int composing_start = std::min(composing_base, composing_extent);
int cursor_offset = selection_base - composing_start;
active_model_->SetComposingRange(
TextRange(composing_base, composing_extent), cursor_offset);
}
} else if (method.compare(kSetMarkedTextRect) == 0) {
if (!method_call.arguments() || method_call.arguments()->IsNull()) {
result->Error(kBadArgumentError, "Method invoked without args");
return;
}
const rapidjson::Document& args = *method_call.arguments();
auto x = args.FindMember(kXKey);
auto y = args.FindMember(kYKey);
auto width = args.FindMember(kWidthKey);
auto height = args.FindMember(kHeightKey);
if (x == args.MemberEnd() || x->value.IsNull() || //
y == args.MemberEnd() || y->value.IsNull() || //
width == args.MemberEnd() || width->value.IsNull() || //
height == args.MemberEnd() || height->value.IsNull()) {
result->Error(kInternalConsistencyError,
"Composing rect values invalid.");
return;
}
composing_rect_ = {{x->value.GetDouble(), y->value.GetDouble()},
{width->value.GetDouble(), height->value.GetDouble()}};
Rect transformed_rect = GetCursorRect();
delegate_->OnCursorRectUpdated(transformed_rect);
} else if (method.compare(kSetEditableSizeAndTransform) == 0) {
if (!method_call.arguments() || method_call.arguments()->IsNull()) {
result->Error(kBadArgumentError, "Method invoked without args");
return;
}
const rapidjson::Document& args = *method_call.arguments();
auto transform = args.FindMember(kTransformKey);
if (transform == args.MemberEnd() || transform->value.IsNull() ||
!transform->value.IsArray() || transform->value.Size() != 16) {
result->Error(kInternalConsistencyError,
"EditableText transform invalid.");
return;
}
size_t i = 0;
for (auto& entry : transform->value.GetArray()) {
if (entry.IsNull()) {
result->Error(kInternalConsistencyError,
"EditableText transform contains null value.");
return;
}
editabletext_transform_[i / 4][i % 4] = entry.GetDouble();
++i;
}
Rect transformed_rect = GetCursorRect();
delegate_->OnCursorRectUpdated(transformed_rect);
} else {
result->NotImplemented();
return;
}
// All error conditions return early, so if nothing has gone wrong indicate
// success.
result->Success();
}