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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/render/CanvasRenderObject.hpp"
#include "cru/ui/render/TextRenderObject.hpp"
#include "cru/ui/UiEvent.hpp"
namespace cru::ui::controls {
constexpr int k_default_caret_blink_duration = 500;
// TControl should inherits `Control` and has following methods:
// ```
// render::TextRenderObject* GetTextRenderObject();
// ```
template <typename TControl>
class TextControlService : public Object {
public:
TextControlService(TControl* control);
CRU_DELETE_COPY(TextControlService)
CRU_DELETE_MOVE(TextControlService)
~TextControlService();
public:
bool IsEnabled() { return enable_; }
void SetEnabled(bool enable);
bool IsCaretVisible() { return caret_visible_; }
void SetCaretVisible(bool visible);
int GetCaretBlinkDuration() { return caret_blink_duration_; }
void SetCaretBlinkDuration(int milliseconds);
private:
void AbortSelection();
void SetupCaret();
void TearDownCaret();
void SetupHandlers();
void MouseMoveHandler(event::MouseEventArgs& args);
void MouseDownHandler(event::MouseButtonEventArgs& args);
void MouseUpHandler(event::MouseButtonEventArgs& args);
void LoseFocusHandler(event::FocusChangeEventArgs& args);
private:
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_;
// before the char
int select_start_position_;
};
template <typename TControl>
TextControlService<TControl>::TextControlService(TControl* control)
: control_(control) {}
template <typename TControl>
TextControlService<TControl>::~TextControlService() {
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_);
}
template <typename TControl>
void TextControlService<TControl>::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();
}
}
template <typename TControl>
void TextControlService<TControl>::SetCaretVisible(bool visible) {
if (visible == this->caret_visible_) return;
this->caret_visible_ = visible;
if (this->enable_) {
if (visible) {
this->SetupCaret();
} else {
this->TearDownCaret();
}
}
}
template <typename TControl>
void TextControlService<TControl>::SetCaretBlinkDuration(int milliseconds) {
if (this->caret_blink_duration_ == milliseconds) return;
if (this->enable_ && this->caret_visible_) {
this->TearDownCaret();
this->SetupCaret();
}
}
template <typename TControl>
void TextControlService<TControl>::AbortSelection() {
if (this->select_down_button_.has_value()) {
this->control_->ReleaseMouse();
this->select_down_button_ = std::nullopt;
}
this->control_->GetTextRenderObject()->SetSelectionRange(std::nullopt);
}
template <typename TControl>
void TextControlService<TControl>::SetupCaret() {
const auto application = GetUiApplication();
// Cancel first anyhow for safety.
application->CancelTimer(this->caret_timer_id_);
this->control_->GetTextRenderObject()->SetDrawCaret(true);
this->caret_timer_id_ = application->SetInterval(
std::chrono::milliseconds(this->caret_blink_duration_),
[this] { this->control_->GetTextRenderObject()->ToggleDrawCaret(); });
}
template <typename TControl>
void TextControlService<TControl>::TearDownCaret() {
const auto application = GetUiApplication();
application->CancelTimer(this->caret_timer_id_);
this->control_->GetTextRenderObject()->SetDrawCaret(false);
}
template <typename TControl>
void TextControlService<TControl>::SetupHandlers() {
Expects(event_revoker_guards_.empty());
this->event_revoker_guards_.push_back(
EventRevokerGuard{control_->MouseMoveEvent()->Direct()->AddHandler(
std::bind(&TextControlService::MouseMoveHandler, this,
std::placeholders::_1))});
this->event_revoker_guards_.push_back(
EventRevokerGuard{control_->MouseDownEvent()->Direct()->AddHandler(
std::bind(&TextControlService::MouseDownHandler, this,
std::placeholders::_1))});
this->event_revoker_guards_.push_back(EventRevokerGuard{
control_->MouseUpEvent()->Direct()->AddHandler(std::bind(
&TextControlService::MouseUpHandler, this, std::placeholders::_1))});
this->event_revoker_guards_.push_back(
EventRevokerGuard{control_->LoseFocusEvent()->Direct()->AddHandler(
std::bind(&TextControlService::LoseFocusHandler, this,
std::placeholders::_1))});
}
template <typename TControl>
void TextControlService<TControl>::MouseMoveHandler(
event::MouseEventArgs& args) {
if (this->select_down_button_.has_value()) {
const auto text_render_object = this->control_->GetTextRenderObject();
const auto result = text_render_object->TextHitTest(
text_render_object->FromRootToContent(args.GetPoint()));
const auto position = result.position + (result.trailing ? 1 : 0);
log::Debug(
"TextControlService: Text selection changed on mouse move, range: {}, "
"{}.",
position, this->select_start_position_);
this->control_->GetTextRenderObject()->SetSelectionRange(
TextRange::FromTwoSides(
static_cast<unsigned>(position),
static_cast<unsigned>(this->select_start_position_)));
text_render_object->SetCaretPosition(position);
}
}
template <typename TControl>
void TextControlService<TControl>::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->control_->GetTextRenderObject();
this->select_down_button_ = args.GetButton();
const auto result = text_render_object->TextHitTest(
text_render_object->FromRootToContent(args.GetPoint()));
const auto position = result.position + (result.trailing ? 1 : 0);
text_render_object->SetSelectionRange(std::nullopt);
text_render_object->SetCaretPosition(position);
this->select_start_position_ = position;
log::Debug("TextControlService: Begin to select text, start position: {}.",
position);
}
}
template <typename TControl>
void TextControlService<TControl>::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;
log::Debug("TextControlService: End selecting text.");
}
}
template <typename TControl>
void TextControlService<TControl>::LoseFocusHandler(
event::FocusChangeEventArgs& args) {
if (!args.IsWindow()) this->AbortSelection();
}
} // namespace cru::ui::controls
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