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-rw-r--r--src/ui/controls/TextControlService.hpp227
1 files changed, 227 insertions, 0 deletions
diff --git a/src/ui/controls/TextControlService.hpp b/src/ui/controls/TextControlService.hpp
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+++ b/src/ui/controls/TextControlService.hpp
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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
generated by cgit v1.2.3 (git 2.46.0) at 2025-09-29 07:54:52 +0000