1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
#include "cru/platform/graph/Factory.hpp"
#include "cru/platform/graph/Font.hpp"
#include "cru/platform/graph/Painter.hpp"
#include "cru/platform/native/InputMethod.hpp"
#include "cru/platform/native/UiApplication.hpp"
#include "cru/platform/native/Window.hpp"
int main() {
using namespace cru::platform;
using namespace cru::platform::graph;
using namespace cru::platform::native;
auto application = CreateUiApplication();
auto graph_factory = application->GetGraphFactory();
auto window_resolver = application->CreateWindow(nullptr);
auto window = window_resolver->Resolve();
auto input_method_context =
application->GetInputMethodManager()->GetContext(window);
auto brush = graph_factory->CreateSolidColorBrush();
brush->SetColor(colors::black);
auto odd_clause_brush = graph_factory->CreateSolidColorBrush();
odd_clause_brush->SetColor(colors::yellow);
auto even_clause_brush = graph_factory->CreateSolidColorBrush();
even_clause_brush->SetColor(colors::green);
auto target_clause_brush = graph_factory->CreateSolidColorBrush();
target_clause_brush->SetColor(colors::blue);
std::shared_ptr<IFont> font = graph_factory->CreateFont("等线", 30);
float window_width = 10000;
auto prompt_text_layout =
graph_factory->CreateTextLayout(font,
"Alt+F1: Enable IME\n"
"Alt+F2: Disable IME\n"
"Alt+F3: Complete composition.\n"
"Alt+F4: Cancel composition.");
std::optional<CompositionText> optional_composition_text;
std::string committed_text;
window->ResizeEvent()->AddHandler(
[&prompt_text_layout, &window_width](const Size& size) {
prompt_text_layout->SetMaxWidth(size.width);
window_width = size.width;
});
window->PaintEvent()->AddHandler([&](auto) {
auto painter = window->BeginPaint();
painter->Clear(colors::white);
painter->DrawText(Point{}, prompt_text_layout.get(), brush.get());
const auto anchor_y = prompt_text_layout->GetTextBounds().height;
auto text_layout = graph_factory->CreateTextLayout(
font,
committed_text +
(optional_composition_text ? optional_composition_text->text : ""));
text_layout->SetMaxWidth(window_width);
if (optional_composition_text) {
const auto& composition_text = *optional_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 (optional_composition_text) {
const auto& composition_text = *optional_composition_text;
const auto cursor_pos = composition_text.selection.position +
gsl::narrow_cast<int>(committed_text.size());
const auto cursor_lefttop =
text_layout->TextSinglePoint(cursor_pos, false);
painter->FillRectangle(Rect{cursor_lefttop.x, cursor_lefttop.y + anchor_y,
3, font->GetFontSize()},
brush.get());
}
});
window->KeyDownEvent()->AddHandler(
[&input_method_context](const NativeKeyEventArgs& args) {
if (args.modifier & key_modifiers::alt) {
switch (args.key) {
case KeyCode::F1:
input_method_context->EnableIME();
break;
case KeyCode::F2:
input_method_context->DisableIME();
break;
case KeyCode::F3:
input_method_context->CompleteComposition();
break;
case KeyCode::F4:
input_method_context->CancelComposition();
break;
default:
break;
}
}
});
input_method_context->TextEvent()->AddHandler(
[window, &committed_text](const std::string_view& c) {
committed_text += c;
window->RequestRepaint();
});
input_method_context->CompositionEvent()->AddHandler(
[window, &input_method_context, &optional_composition_text](auto) {
optional_composition_text = input_method_context->GetCompositionText();
window->RequestRepaint();
});
input_method_context->CompositionEndEvent()->AddHandler(
[window, &optional_composition_text](auto) {
optional_composition_text = std::nullopt;
window->RequestRepaint();
});
window->SetVisible(true);
return application->Run();
}
|
