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#include "cru/ui/controls/text_common.hpp"
#include "cru/common/logger.hpp"
#include "cru/platform/graph/font.hpp"
#include "cru/platform/graph/painter.hpp"
#include "cru/platform/native/ui_application.hpp"
#include "cru/ui/control.hpp"
#include "cru/ui/render/canvas_render_object.hpp"
#include "cru/ui/render/text_render_object.hpp"
#include <cassert>
namespace cru::ui::controls {
using platform::graph::ITextLayout;
constexpr float caret_width = 2;
constexpr long long caret_blink_duration = 500;
TextControlService::TextControlService(Control* control,
ITextControl* text_control)
: control_(control), text_control_(text_control) {}
TextControlService::~TextControlService() {
if (enable_ && caret_visible_) TearDownCaretTimer();
}
void TextControlService::SetEnabled(bool enable) {
if (enable == enable_) return;
if (enable) {
AbortSelection();
SetupHandlers();
if (caret_visible_) {
SetupCaretTimer();
}
} else {
event_revoker_guards_.clear();
if (caret_visible_) {
TearDownCaretTimer();
}
}
}
void TextControlService::SetCaretVisible(bool visible) {
if (visible == caret_visible_) return;
if (enable_) {
if (visible) {
SetupCaretTimer();
}
} else {
TearDownCaretTimer();
}
} // namespace cru::ui::controls
void TextControlService::DrawCaret(platform::graph::IPainter* painter) {
if (caret_show_) {
const auto text_render_object = text_control_->GetTextRenderObject();
const auto point = text_render_object->TextSingleRect(
caret_position_, false); // Maybe cache the result???
painter->FillRectangle(
Rect{point,
Size{caret_width, text_render_object->GetFont()->GetFontSize()}},
text_control_->GetCaretBrush());
}
}
void TextControlService::AbortSelection() {
if (select_down_button_.has_value()) {
control_->ReleaseMouse();
select_down_button_ = std::nullopt;
}
text_control_->GetTextRenderObject()->SetSelectionRange(std::nullopt);
}
void TextControlService::SetupCaretTimer() {
#ifdef CRU_DEBUG
assert(!caret_timer_set_);
caret_timer_set_ = true;
#endif
caret_timer_tag_ =
platform::native::IUiApplication::GetInstance()->SetInterval(
std::chrono::milliseconds(caret_blink_duration), [this] {
this->caret_show_ = !this->caret_show_;
this->text_control_->GetCaretRenderObject()->InvalidatePaint();
});
}
void TextControlService::TearDownCaretTimer() {
#ifdef CRU_DEBUG
assert(!caret_timer_set_);
caret_timer_set_ = false;
#endif
platform::native::IUiApplication::GetInstance()->CancelTimer(
caret_timer_tag_);
}
void TextControlService::SetupHandlers() {
assert(event_revoker_guards_.empty());
event_revoker_guards_.push_back(
EventRevokerGuard{control_->MouseMoveEvent()->Direct()->AddHandler(
std::bind(&TextControlService::MouseMoveHandler, this,
std::placeholders::_1))});
event_revoker_guards_.push_back(
EventRevokerGuard{control_->MouseDownEvent()->Direct()->AddHandler(
std::bind(&TextControlService::MouseDownHandler, this,
std::placeholders::_1))});
event_revoker_guards_.push_back(EventRevokerGuard{
control_->MouseUpEvent()->Direct()->AddHandler(std::bind(
&TextControlService::MouseUpHandler, this, std::placeholders::_1))});
event_revoker_guards_.push_back(
EventRevokerGuard{control_->LoseFocusEvent()->Direct()->AddHandler(
std::bind(&TextControlService::LoseFocusHandler, this,
std::placeholders::_1))});
}
void TextControlService::MouseMoveHandler(event::MouseEventArgs& args) {
if (this->select_down_button_.has_value()) {
const auto text_render_object = this->text_control_->GetTextRenderObject();
const auto result = text_render_object->TextHitTest(
text_render_object->FromRootToContent(args.GetPoint()));
const auto position = result.position + (result.trailing ? 1 : 0);
this->caret_position_ = position;
log::Debug(
"TextControlService: Text selection changed on mouse move, range: {}, "
"{}.",
position, this->select_start_position_);
this->text_control_->GetTextRenderObject()->SetSelectionRange(
TextRange::FromTwoSides(
static_cast<unsigned>(position),
static_cast<unsigned>(this->select_start_position_)));
this->text_control_->GetTextRenderObject()->InvalidatePaint();
this->text_control_->GetCaretRenderObject()->InvalidatePaint();
}
}
void TextControlService::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->text_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);
this->select_start_position_ = position;
log::Debug("TextControlService: Begin to select text, start position: {}.",
position);
}
}
void TextControlService::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.");
}
}
void TextControlService::LoseFocusHandler(event::FocusChangeEventArgs& args) {
if (!args.IsWindow()) this->AbortSelection();
}
} // namespace cru::ui::controls
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