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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) {
event_revoker_guards_.push_back(
EventRevokerGuard{control->MouseDownEvent()->Direct()->AddHandler(
[this](event::MouseButtonEventArgs& args) {
if (this->select_down_button_.has_value()) {
return;
} else {
if (!this->control_->CaptureMouse()) 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("Begin to select text. Position: {}", position);
}
})});
event_revoker_guards_.push_back(
EventRevokerGuard{control->MouseMoveEvent()->Direct()->AddHandler(
[this](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("Text select 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();
}
})});
event_revoker_guards_.push_back(
EventRevokerGuard{control->MouseUpEvent()->Direct()->AddHandler(
[this](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("End selecting text.");
}
})});
}
TextControlService::~TextControlService() { TearDownCaretTimer(); }
void TextControlService::SetCaretVisible(bool visible) {
if (visible) {
SetupCaretTimer();
} else {
TearDownCaretTimer();
}
}
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::SetupCaretTimer() {
if (caret_visible_) return;
caret_visible_ = true;
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() {
if (!caret_visible_) return;
caret_visible_ = false;
platform::native::IUiApplication::GetInstance()->CancelTimer(
caret_timer_tag_);
}
} // namespace cru::ui::controls
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