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-rw-r--r--src/ui/controls/TextControlService.hpp511
1 files changed, 0 insertions, 511 deletions
diff --git a/src/ui/controls/TextControlService.hpp b/src/ui/controls/TextControlService.hpp
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--- a/src/ui/controls/TextControlService.hpp
+++ /dev/null
@@ -1,511 +0,0 @@
-#pragma once
-#include "../Helper.hpp"
-#include "cru/common/Logger.hpp"
-#include "cru/common/StringUtil.hpp"
-#include "cru/platform/graphics/Font.hpp"
-#include "cru/platform/graphics/Painter.hpp"
-#include "cru/platform/gui/Cursor.hpp"
-#include "cru/platform/gui/InputMethod.hpp"
-#include "cru/platform/gui/UiApplication.hpp"
-#include "cru/platform/gui/Window.hpp"
-#include "cru/ui/Base.hpp"
-#include "cru/ui/DebugFlags.hpp"
-#include "cru/ui/controls/Control.hpp"
-#include "cru/ui/events/UiEvent.hpp"
-#include "cru/ui/helper/ShortcutHub.hpp"
-#include "cru/ui/host/WindowHost.hpp"
-#include "cru/ui/render/CanvasRenderObject.hpp"
-#include "cru/ui/render/ScrollRenderObject.hpp"
-#include "cru/ui/render/TextRenderObject.hpp"
-
-#include <string>
-
-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() = default;
-
- public:
- bool IsEnabled() { return enable_; }
-
- void SetEnabled(bool enable) {
- if (enable == this->enable_) return;
- this->enable_ = enable;
- if (enable) {
- this->SetUpHandlers();
- if (this->caret_visible_) {
- this->SetupCaret();
- }
- this->control_->SetCursor(
- GetUiApplication()->GetCursorManager()->GetSystemCursor(
- platform::gui::SystemCursorType::IBeam));
- } else {
- this->AbortSelection();
- this->TearDownHandlers();
- this->TearDownCaret();
- this->control_->SetCursor(nullptr);
- }
- }
-
- bool IsEditable() { return this->editable_; }
-
- void SetEditable(bool editable) {
- this->editable_ = editable;
- if (!editable) CancelComposition();
- }
-
- std::u16string GetText() { return this->text_; }
- std::u16string_view GetTextView() { return this->text_; }
- void SetText(std::u16string text, bool stop_composition = false) {
- this->text_ = std::move(text);
- CoerceSelection();
- if (stop_composition) {
- CancelComposition();
- }
- SyncTextRenderObject();
- }
-
- void InsertText(gsl::index position, std::u16string_view text,
- bool stop_composition = false) {
- if (!Utf16IsValidInsertPosition(this->text_, position)) {
- log::TagError(log_tag, u"Invalid text insert position.");
- return;
- }
- this->text_.insert(this->text_.cbegin() + position, text.begin(),
- text.end());
- if (stop_composition) {
- CancelComposition();
- }
- SyncTextRenderObject();
- }
-
- void DeleteChar(gsl::index position, bool stop_composition = false) {
- if (!Utf16IsValidInsertPosition(this->text_, position)) {
- log::TagError(log_tag, u"Invalid text delete position.");
- return;
- }
- if (position == static_cast<gsl::index>(this->text_.size())) return;
- Index next;
- Utf16NextCodePoint(this->text_, position, &next);
- this->DeleteText(TextRange::FromTwoSides(position, next), stop_composition);
- }
-
- // Return the position of deleted character.
- gsl::index DeleteCharPrevious(gsl::index position,
- bool stop_composition = false) {
- if (!Utf16IsValidInsertPosition(this->text_, position)) {
- log::TagError(log_tag, u"Invalid text delete position.");
- return 0;
- }
- if (position == 0) return 0;
- Index previous;
- Utf16PreviousCodePoint(this->text_, position, &previous);
- this->DeleteText(TextRange::FromTwoSides(previous, position),
- stop_composition);
- return previous;
- }
-
- void DeleteText(TextRange range, bool stop_composition = false) {
- if (range.count == 0) return;
- range = range.Normalize();
- if (!Utf16IsValidInsertPosition(this->text_, range.GetStart())) {
- log::TagError(log_tag, u"Invalid text delete start position.");
- return;
- }
- if (!Utf16IsValidInsertPosition(this->text_, range.GetStart())) {
- log::TagError(log_tag, u"Invalid text delete end position.");
- return;
- }
- this->text_.erase(this->text_.cbegin() + range.GetStart(),
- this->text_.cbegin() + range.GetEnd());
- this->CoerceSelection();
- if (stop_composition) {
- CancelComposition();
- }
- this->SyncTextRenderObject();
- }
-
- platform::gui::IInputMethodContext* GetInputMethodContext() {
- host::WindowHost* host = this->control_->GetWindowHost();
- if (!host) return nullptr;
- platform::gui::INativeWindow* native_window = host->GetNativeWindow();
- if (!native_window) return nullptr;
- return native_window->GetInputMethodContext();
- }
-
- void CancelComposition() {
- auto input_method_context = GetInputMethodContext();
- if (input_method_context == nullptr) return;
- input_method_context->CancelComposition();
- }
-
- std::optional<platform::gui::CompositionText> GetCompositionInfo() {
- auto input_method_context = GetInputMethodContext();
- if (input_method_context == nullptr) return std::nullopt;
- auto composition_info = input_method_context->GetCompositionText();
- if (composition_info.text.empty()) return std::nullopt;
- return composition_info;
- }
-
- 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 selection_.GetEnd(); }
-
- TextRange GetSelection() { return selection_; }
-
- void SetSelection(gsl::index caret_position) {
- this->SetSelection(TextRange{caret_position, 0});
- }
-
- void SetSelection(TextRange selection, bool scroll_to_caret = true) {
- this->selection_ = selection;
- CoerceSelection();
- SyncTextRenderObject();
- if (scroll_to_caret) {
- this->ScrollToCaret();
- }
- }
-
- void DeleteSelectedText() {
- this->DeleteText(GetSelection());
- SetSelection(GetSelection().Normalize().GetStart());
- }
-
- // If some text is selected, then they are deleted first. Then insert text
- // into caret position.
- void ReplaceSelectedText(std::u16string_view text) {
- DeleteSelectedText();
- InsertText(GetSelection().GetStart(), text);
- SetSelection(GetSelection().GetStart() + text.size());
- }
-
- void ScrollToCaret() {
- if (const auto scroll_render_object = this->GetScrollRenderObject()) {
- this->control_->GetWindowHost()->RunAfterLayoutStable(
- [this, scroll_render_object]() {
- const auto caret_rect = this->GetTextRenderObject()->GetCaretRect();
- scroll_render_object->ScrollToContain(caret_rect, Thickness{5.f});
- });
- }
- }
-
- private:
- void CoerceSelection() {
- this->selection_ = this->selection_.CoerceInto(0, text_.size());
- }
-
- 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();
- this->GetTextRenderObject()->SetDrawCaret(true);
- this->caret_timer_canceler_.Reset(application->SetInterval(
- std::chrono::milliseconds(this->caret_blink_duration_),
- [this] { this->GetTextRenderObject()->ToggleDrawCaret(); }));
- }
-
- void TearDownCaret() {
- this->caret_timer_canceler_.Reset();
- this->GetTextRenderObject()->SetDrawCaret(false);
- }
-
- void SyncTextRenderObject() {
- const auto text_render_object = this->GetTextRenderObject();
- const auto composition_info = this->GetCompositionInfo();
- if (composition_info) {
- const auto caret_position = GetCaretPosition();
- auto text = this->text_;
- text.insert(caret_position, composition_info->text);
- text_render_object->SetText(text);
- text_render_object->SetCaretPosition(
- caret_position + composition_info->selection.GetEnd());
- auto selection = composition_info->selection;
- selection.position += caret_position;
- text_render_object->SetSelectionRange(selection);
- } else {
- text_render_object->SetText(this->text_);
- text_render_object->SetCaretPosition(this->GetCaretPosition());
- text_render_object->SetSelectionRange(this->GetSelection());
- }
- }
-
- void StartSelection(Index start) {
- SetSelection(start);
- if constexpr (debug_flags::text_service)
- log::TagDebug(log_tag, u"Text selection started, position: {}.", start);
- }
-
- void UpdateSelection(Index new_end) {
- auto selection = GetSelection();
- selection.AdjustEnd(new_end);
- this->SetSelection(selection);
- if constexpr (debug_flags::text_service)
- log::TagDebug(log_tag, u"Text selection updated, range: {}, {}.",
- selection.GetStart(), selection.GetEnd());
- }
-
- void UpdateInputMethodPosition() {
- if (auto input_method_context = this->GetInputMethodContext()) {
- Point right_bottom =
- this->GetTextRenderObject()->GetTotalOffset() +
- this->GetTextRenderObject()->GetCaretRect().GetRightBottom();
- right_bottom.x += 5;
- right_bottom.y += 5;
-
- if constexpr (debug_flags::text_service) {
- log::TagDebug(log_tag,
- u"Calculate input method candidate window position: {}.",
- right_bottom.ToDebugString());
- }
-
- input_method_context->SetCandidateWindowPosition(right_bottom);
- }
- }
-
- template <typename TArgs>
- void SetupOneHandler(event::RoutedEvent<TArgs>* (Control::*event)(),
- void (TextControlService::*handler)(
- typename event::RoutedEvent<TArgs>::EventArgs)) {
- this->event_guard_ += (this->control_->*event)()->Direct()->AddHandler(
- std::bind(handler, this, std::placeholders::_1));
- }
-
- void SetUpHandlers() {
- Expects(event_guard_.IsEmpty());
-
- SetupOneHandler(&Control::MouseMoveEvent,
- &TextControlService::MouseMoveHandler);
- SetupOneHandler(&Control::MouseDownEvent,
- &TextControlService::MouseDownHandler);
- SetupOneHandler(&Control::MouseUpEvent,
- &TextControlService::MouseUpHandler);
- SetupOneHandler(&Control::KeyDownEvent,
- &TextControlService::KeyDownHandler);
- SetupOneHandler(&Control::GainFocusEvent,
- &TextControlService::GainFocusHandler);
- SetupOneHandler(&Control::LoseFocusEvent,
- &TextControlService::LoseFocusHandler);
-
- shortcut_hub_.Install(control_);
- }
-
- void TearDownHandlers() {
- event_guard_.Clear();
- shortcut_hub_.Uninstall();
- }
-
- 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 {
- this->control_->SetFocus();
- if (!this->control_->CaptureMouse()) 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) {
- const auto key_code = args.GetKeyCode();
- using cru::platform::gui::KeyCode;
- using cru::platform::gui::KeyModifiers;
-
- switch (key_code) {
- case KeyCode::Backspace: {
- if (!IsEditable()) return;
- const auto selection = GetSelection();
- if (selection.count == 0) {
- SetSelection(DeleteCharPrevious(GetCaretPosition()));
- } else {
- this->DeleteSelectedText();
- }
- } break;
- case KeyCode::Delete: {
- if (!IsEditable()) return;
- const auto selection = GetSelection();
- if (selection.count == 0) {
- DeleteChar(GetCaretPosition());
- } else {
- this->DeleteSelectedText();
- }
- } break;
- case KeyCode::Left: {
- const auto key_modifier = args.GetKeyModifier();
- const bool shift = key_modifier & KeyModifiers::shift;
- auto text = this->GetTextView();
- if (shift) {
- auto selection = this->GetSelection();
- gsl::index new_position;
- Utf16PreviousCodePoint(text, selection.GetEnd(), &new_position);
- selection.AdjustEnd(new_position);
- this->SetSelection(selection);
- } else {
- const auto caret = this->GetCaretPosition();
- gsl::index new_position;
- Utf16PreviousCodePoint(text, caret, &new_position);
- this->SetSelection(new_position);
- }
- } break;
- case KeyCode::Right: {
- const auto key_modifier = args.GetKeyModifier();
- const bool shift = key_modifier & KeyModifiers::shift;
- auto text = this->GetTextView();
- if (shift) {
- auto selection = this->GetSelection();
- gsl::index new_position;
- Utf16NextCodePoint(text, selection.GetEnd(), &new_position);
- selection.AdjustEnd(new_position);
- this->SetSelection(selection);
- } else {
- const auto caret = this->GetCaretPosition();
- gsl::index new_position;
- Utf16NextCodePoint(text, caret, &new_position);
- this->SetSelection(new_position);
- }
- } break;
- default:
- break;
- }
- }
-
- void GainFocusHandler(event::FocusChangeEventArgs& args) {
- CRU_UNUSED(args);
- if (editable_) {
- auto input_method_context = GetInputMethodContext();
- if (input_method_context == nullptr) return;
- input_method_context->EnableIME();
- auto sync = [this](std::nullptr_t) {
- this->SyncTextRenderObject();
- ScrollToCaret();
- };
- input_method_context_event_guard_ +=
- input_method_context->CompositionStartEvent()->AddHandler(
- [this](std::nullptr_t) { this->DeleteSelectedText(); });
- input_method_context_event_guard_ +=
- input_method_context->CompositionEvent()->AddHandler(sync);
- input_method_context_event_guard_ +=
- input_method_context->CompositionEndEvent()->AddHandler(sync);
- input_method_context_event_guard_ +=
- input_method_context->TextEvent()->AddHandler(
- [this](const std::u16string_view& text) {
- if (text == u"\b") return;
- this->ReplaceSelectedText(text);
- });
-
- host::WindowHost* window_host = control_->GetWindowHost();
- if (window_host)
- input_method_context_event_guard_ +=
- window_host->AfterLayoutEvent()->AddHandler(
- [this](auto) { this->UpdateInputMethodPosition(); });
- SetCaretVisible(true);
- }
- }
-
- void LoseFocusHandler(event::FocusChangeEventArgs& args) {
- if (!args.IsWindow()) this->AbortSelection();
- input_method_context_event_guard_.Clear();
- auto input_method_context = GetInputMethodContext();
- if (input_method_context) {
- input_method_context->DisableIME();
- }
- SetCaretVisible(false);
- SyncTextRenderObject();
- }
-
- private:
- gsl::not_null<TControl*> control_;
- EventRevokerListGuard event_guard_;
- EventRevokerListGuard input_method_context_event_guard_;
-
- std::u16string text_;
- TextRange selection_;
-
- bool enable_ = false;
- bool editable_ = false;
-
- bool caret_visible_ = false;
- platform::gui::TimerAutoCanceler caret_timer_canceler_;
- int caret_blink_duration_ = k_default_caret_blink_duration;
-
- helper::ShortcutHub shortcut_hub_;
-
- // nullopt means not selecting
- std::optional<MouseButton> select_down_button_;
-};
-} // namespace cru::ui::controls
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