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#pragma once
#include "../Helper.hpp"
#include "cru/common/Logger.hpp"
#include "cru/platform/graph/Font.hpp"
#include "cru/platform/graph/Painter.hpp"
#include "cru/platform/native/UiApplication.hpp"
#include "cru/ui/Control.hpp"
#include "cru/ui/UiEvent.hpp"
#include "cru/ui/render/CanvasRenderObject.hpp"
#include "cru/ui/render/ScrollRenderObject.hpp"
#include "cru/ui/render/TextRenderObject.hpp"
namespace cru::ui::controls {
constexpr int k_default_caret_blink_duration = 500;
// TControl should inherits `Control` and has following methods:
// ```
// gsl::not_null<render::TextRenderObject*> GetTextRenderObject();
// render::ScrollRenderObject* GetScrollRenderObject();
// ```
template <typename TControl>
class TextControlService : public Object {
CRU_DEFINE_CLASS_LOG_TAG(u"cru::ui::controls::TextControlService")
public:
TextControlService(gsl::not_null<TControl*> control) : control_(control) {}
CRU_DELETE_COPY(TextControlService)
CRU_DELETE_MOVE(TextControlService)
~TextControlService() override {
const auto application = GetUiApplication();
// Don't call TearDownCaret, because it use text render object of control,
// which may be destroyed already.
application->CancelTimer(this->caret_timer_id_);
}
public:
bool IsEnabled() { return enable_; }
void SetEnabled(bool enable) {
if (enable == this->enable_) return;
if (enable) {
this->SetupHandlers();
if (this->caret_visible_) {
this->SetupCaret();
}
} else {
this->AbortSelection();
this->event_revoker_guards_.clear();
this->TearDownCaret();
}
}
bool IsCaretVisible() { return caret_visible_; }
void SetCaretVisible(bool visible) {
if (visible == this->caret_visible_) return;
this->caret_visible_ = visible;
if (this->enable_) {
if (visible) {
this->SetupCaret();
} else {
this->TearDownCaret();
}
}
}
int GetCaretBlinkDuration() { return caret_blink_duration_; }
void SetCaretBlinkDuration(int milliseconds) {
if (this->caret_blink_duration_ == milliseconds) return;
if (this->enable_ && this->caret_visible_) {
this->TearDownCaret();
this->SetupCaret();
}
}
gsl::not_null<render::TextRenderObject*> GetTextRenderObject() {
return this->control_->GetTextRenderObject();
}
render::ScrollRenderObject* GetScrollRenderObject() {
return this->control_->GetScrollRenderObject();
}
gsl::index GetCaretPosition() {
return this->GetTextRenderObject()->GetCaretPosition();
}
void SetCaretPosition(gsl::index position, bool clear_selection = true) {
this->GetTextRenderObject()->SetCaretPosition(position);
if (clear_selection) {
this->GetTextRenderObject()->SetSelectionRange(std::nullopt);
}
}
std::optional<TextRange> GetSelection() {
return this->GetTextRenderObject()->GetSelectionRange();
}
void SetSelection(std::optional<TextRange> selection,
bool set_caret_to_end = true) {
this->GetTextRenderObject()->SetSelectionRange(selection);
if (selection && set_caret_to_end) {
this->GetTextRenderObject()->SetCaretPosition(selection->GetEnd());
}
}
private:
void AbortSelection() {
if (this->select_down_button_.has_value()) {
this->control_->ReleaseMouse();
this->select_down_button_ = std::nullopt;
}
this->GetTextRenderObject()->SetSelectionRange(std::nullopt);
}
void SetupCaret() {
const auto application = GetUiApplication();
// Cancel first anyhow for safety.
application->CancelTimer(this->caret_timer_id_);
this->GetTextRenderObject()->SetDrawCaret(true);
this->caret_timer_id_ = application->SetInterval(
std::chrono::milliseconds(this->caret_blink_duration_),
[this] { this->GetTextRenderObject()->ToggleDrawCaret(); });
}
void TearDownCaret() {
const auto application = GetUiApplication();
application->CancelTimer(this->caret_timer_id_);
this->GetTextRenderObject()->SetDrawCaret(false);
}
template <typename TArgs>
void SetupOneHandler(event::RoutedEvent<TArgs>* (TControl::*event)(),
void (TextControlService::*handler)(
typename event::RoutedEvent<TArgs>::EventArgs)) {
this->event_revoker_guards_.push_back(
EventRevokerGuard{(this->control_->*event)()->Direct()->AddHandler(
std::bind(handler, this, std::placeholders::_1))});
}
void StartSelection(Index start) {
const auto text_render_object = this->GetTextRenderObject();
text_render_object->SetSelectionRange(TextRange{start, 0});
text_render_object->SetCaretPosition(start);
log::TagDebug(log_tag, u"Text selection started, position: {}.", start);
}
void UpdateSelection(Index new_end) {
const auto text_render_object = this->GetTextRenderObject();
const auto old_selection = text_render_object->GetSelectionRange();
if (!old_selection.has_value()) return;
const auto old_start = old_selection->GetStart();
this->GetTextRenderObject()->SetSelectionRange(
TextRange::FromTwoSides(old_start, new_end));
text_render_object->SetCaretPosition(new_end);
log::TagDebug(log_tag, u"Text selection updated, range: {}, {}.", old_start,
new_end);
if (const auto scroll_render_object = this->GetScrollRenderObject()) {
const auto caret_rect = text_render_object->GetCaretRect();
scroll_render_object->ScrollToContain(caret_rect, Thickness{5.f});
}
}
void SetupHandlers() {
Expects(event_revoker_guards_.empty());
SetupOneHandler(&Control::MouseMoveEvent,
&TextControlService::MouseMoveHandler);
SetupOneHandler(&Control::MouseDownEvent,
&TextControlService::MouseDownHandler);
SetupOneHandler(&Control::MouseUpEvent,
&TextControlService::MouseUpHandler);
SetupOneHandler(&Control::KeyDownEvent,
&TextControlService::KeyDownHandler);
SetupOneHandler(&Control::KeyUpEvent, &TextControlService::KeyUpHandler);
SetupOneHandler(&Control::LoseFocusEvent,
&TextControlService::LoseFocusHandler);
}
void MouseMoveHandler(event::MouseEventArgs& args) {
if (this->select_down_button_.has_value()) {
const auto text_render_object = this->GetTextRenderObject();
const auto result = text_render_object->TextHitTest(
args.GetPointToContent(text_render_object));
const auto position = result.position + (result.trailing ? 1 : 0);
UpdateSelection(position);
}
}
void MouseDownHandler(event::MouseButtonEventArgs& args) {
if (this->select_down_button_.has_value()) {
return;
} else {
if (!this->control_->CaptureMouse()) return;
if (!this->control_->RequestFocus()) return;
const auto text_render_object = this->GetTextRenderObject();
this->select_down_button_ = args.GetButton();
const auto result = text_render_object->TextHitTest(
args.GetPointToContent(text_render_object));
const auto position = result.position + (result.trailing ? 1 : 0);
StartSelection(position);
}
}
void MouseUpHandler(event::MouseButtonEventArgs& args) {
if (this->select_down_button_.has_value() &&
this->select_down_button_.value() == args.GetButton()) {
this->control_->ReleaseMouse();
this->select_down_button_ = std::nullopt;
}
}
void KeyDownHandler(event::KeyEventArgs& args) { CRU_UNUSED(args); }
void KeyUpHandler(event::KeyEventArgs& args) { CRU_UNUSED(args); }
void LoseFocusHandler(event::FocusChangeEventArgs& args) {
if (!args.IsWindow()) this->AbortSelection();
}
private:
gsl::not_null<TControl*> control_;
std::vector<EventRevokerGuard> event_revoker_guards_;
bool enable_ = false;
bool caret_visible_ = false;
long long caret_timer_id_ = -1;
int caret_blink_duration_ = k_default_caret_blink_duration;
// nullopt means not selecting
std::optional<MouseButton> select_down_button_;
};
} // namespace cru::ui::controls
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