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#include "cru/platform/Color.h"
#include "cru/platform/GraphicsBase.h"
#include "cru/platform/bootstrap/Bootstrap.h"
#include "cru/platform/graphics/Factory.h"
#include "cru/platform/graphics/Font.h"
#include "cru/platform/graphics/Painter.h"
#include "cru/platform/gui/InputMethod.h"
#include "cru/platform/gui/UiApplication.h"
#include "cru/platform/gui/Window.h"
#include <optional>
using namespace cru;
using namespace cru::platform;
using namespace cru::platform::graphics;
using namespace cru::platform::gui;
struct InputMethodState {
CompositionText composition_text;
Rect cursor_rect;
TextRange colored_text_range;
};
int main() {
IUiApplication* application = bootstrap::CreateUiApplication();
auto graphics_factory = application->GetGraphicsFactory();
auto window = application->CreateWindow();
auto input_method_context = window->GetInputMethodContext();
auto brush = graphics_factory->CreateSolidColorBrush();
brush->SetColor(colors::black);
auto odd_clause_brush = graphics_factory->CreateSolidColorBrush();
odd_clause_brush->SetColor(colors::yellow);
auto even_clause_brush = graphics_factory->CreateSolidColorBrush();
even_clause_brush->SetColor(colors::green);
auto target_clause_brush = graphics_factory->CreateSolidColorBrush();
target_clause_brush->SetColor(colors::blue);
std::shared_ptr<IFont> font = graphics_factory->CreateFont(String{}, 30);
auto prompt_text_layout =
graphics_factory->CreateTextLayout(font,
u"Ctrl+1: Enable IME\n"
u"Ctrl+2: Disable IME\n"
u"Ctrl+3: Complete composition.\n"
u"Ctrl+4: Cancel composition.");
float anchor_y;
String committed_text;
auto text_layout = graphics_factory->CreateTextLayout(font, u"");
std::optional<InputMethodState> state;
auto update_text_layout_width = [&prompt_text_layout, &anchor_y,
&text_layout](float width) {
prompt_text_layout->SetMaxWidth(width);
text_layout->SetMaxWidth(width);
anchor_y = prompt_text_layout->GetTextBounds().height;
};
update_text_layout_width(window->GetClientSize().width);
window->ResizeEvent()->AddHandler(
[&update_text_layout_width](const Size& size) {
update_text_layout_width(size.width);
});
window->PaintEvent()->AddHandler([&](auto) {
auto painter = window->BeginPaint();
painter->Clear(colors::white);
painter->DrawText(Point{}, prompt_text_layout.get(), brush.get());
if (state) {
const auto& composition_text = state->composition_text;
for (int i = 0; i < static_cast<int>(composition_text.clauses.size());
i++) {
const auto& clause = composition_text.clauses[i];
auto rects = text_layout->TextRangeRect(TextRange::FromTwoSides(
clause.start, clause.end, committed_text.size()));
const auto& b = clause.target
? target_clause_brush
: (i % 2 ? odd_clause_brush : even_clause_brush);
for (auto& rect : rects) {
rect.top += anchor_y;
painter->FillRectangle(rect, b.get());
}
}
}
painter->DrawText(Point{0, anchor_y}, text_layout.get(), brush.get());
if (state) {
const auto& composition_text = state->composition_text;
const auto& cursor_rect = state->cursor_rect;
painter->FillRectangle(Rect{cursor_rect.left, cursor_rect.top + anchor_y,
3, cursor_rect.height},
brush.get());
}
painter->EndDraw();
});
window->KeyDownEvent()->AddHandler(
[&input_method_context](const NativeKeyEventArgs& args) {
if (args.modifier & KeyModifiers::ctrl) {
switch (args.key) {
case KeyCode::N1:
input_method_context->EnableIME();
break;
case KeyCode::N2:
input_method_context->DisableIME();
break;
case KeyCode::N3:
input_method_context->CompleteComposition();
break;
case KeyCode::N4:
input_method_context->CancelComposition();
break;
default:
break;
}
}
});
input_method_context->TextEvent()->AddHandler(
[window, &committed_text](const StringView& c) {
committed_text += c;
window->RequestRepaint();
});
input_method_context->CompositionEvent()->AddHandler([window,
&input_method_context,
&committed_text,
&anchor_y, &state,
&text_layout](auto) {
const auto composition_text = input_method_context->GetCompositionText();
state.emplace();
state->composition_text = input_method_context->GetCompositionText();
text_layout->SetText(committed_text + composition_text.text);
const auto cursor_pos = composition_text.selection.position +
gsl::narrow_cast<int>(committed_text.size());
state->cursor_rect = text_layout->TextSinglePoint(cursor_pos, false);
input_method_context->SetCandidateWindowPosition(
{state->cursor_rect.left, anchor_y + state->cursor_rect.GetBottom()});
window->RequestRepaint();
});
input_method_context->CompositionEndEvent()->AddHandler(
[window, &state](auto) {
state = std::nullopt;
window->RequestRepaint();
});
window->SetVisibility(WindowVisibilityType::Show);
return application->Run();
}
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