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#include "cru/osx/graphics/quartz/TextLayout.hpp"
#include "cru/osx/graphics/quartz/Convert.hpp"
#include "cru/osx/graphics/quartz/Resource.hpp"
#include "cru/platform/Check.hpp"
#include <algorithm>
#include <limits>
namespace cru::platform::graphics::osx::quartz {
OsxCTTextLayout::OsxCTTextLayout(IGraphicsFactory* graphics_factory,
std::shared_ptr<OsxCTFont> font,
const String& str)
: OsxQuartzResource(graphics_factory),
max_width_(0.f),
max_height_(0.f),
font_(std::move(font)),
text_(str) {
cf_text_ = Convert(str);
RecreateFrame();
}
OsxCTTextLayout::~OsxCTTextLayout() {}
void OsxCTTextLayout::SetFont(std::shared_ptr<IFont> font) {
font_ = CheckPlatform<OsxCTFont>(font, GetPlatformId());
CFRelease(ct_framesetter_);
CFRelease(ct_frame_);
RecreateFrame();
}
void OsxCTTextLayout::SetText(String new_text) {
text_ = std::move(new_text);
CFRelease(cf_text_);
cf_text_ = Convert(text_);
CFRelease(ct_framesetter_);
CFRelease(ct_frame_);
RecreateFrame();
}
void OsxCTTextLayout::SetMaxWidth(float max_width) {
max_width_ = max_width;
CFRelease(ct_framesetter_);
CFRelease(ct_frame_);
RecreateFrame();
}
void OsxCTTextLayout::SetMaxHeight(float max_height) {
max_height_ = max_height;
CFRelease(ct_framesetter_);
CFRelease(ct_frame_);
RecreateFrame();
}
Rect OsxCTTextLayout::GetTextBounds(bool includingTrailingSpace) {
float left = std::numeric_limits<float>::max();
float top = std::numeric_limits<float>::max();
float right = 0;
float bottom = 0;
for (int i = 0; i < line_count_; i++) {
auto line = static_cast<CTLineRef>(lines_[i]);
const auto& line_origin = line_origins_[i];
CGRect line_rect = CTLineGetImageBounds(line, nullptr);
if (includingTrailingSpace) {
float trailingWidth = CTLineGetTrailingWhitespaceWidth(line);
line_rect.size.width += trailingWidth;
}
line_rect.origin.x += line_origin.x;
line_rect.origin.y += line_origin.y;
left = std::min<float>(line_rect.origin.x, left);
top = std::min<float>(line_rect.origin.y, top);
right = std::max<float>(line_rect.origin.x + line_rect.size.width, right);
bottom =
std::max<float>(line_rect.origin.y + line_rect.size.height, bottom);
}
return Rect::FromVertices(left, top, right, bottom);
}
std::vector<Rect> OsxCTTextLayout::TextRangeRect(const TextRange& text_range) {
const auto r = text_.RangeFromCodeUnitToCodePoint(text_range).Normalize();
std::vector<Rect> results;
for (int i = 0; i < line_count_; i++) {
auto line = lines_[i];
const auto& line_origin = line_origins_[i];
Range range = Convert(CTLineGetStringRange(line));
range = range.CoerceInto(r.GetStart(), r.GetEnd());
if (range.count) {
auto line_rect = CTLineGetImageBounds(line, nullptr);
line_rect.origin.x += line_origin.x;
line_rect.origin.y += line_origin.y;
float start_offset =
CTLineGetOffsetForStringIndex(line, range.GetStart(), nullptr);
float end_offset =
CTLineGetOffsetForStringIndex(line, range.GetEnd(), nullptr);
line_rect.origin.x += start_offset;
line_rect.size.width = end_offset - start_offset;
results.push_back(Convert(line_rect));
}
}
return results;
}
Point OsxCTTextLayout::TextSinglePoint(Index position, bool trailing) {
position = text_.IndexFromCodeUnitToCodePoint(position);
for (int i = 0; i < line_count_; i++) {
auto line = lines_[i];
const auto& line_origin = line_origins_[i];
Range range = Convert(CTLineGetStringRange(line));
if (range.GetStart() <= position && position < range.GetEnd()) {
auto offset = CTLineGetOffsetForStringIndex(line, position, nullptr);
return Point(line_origin.x + offset, line_origin.y);
}
}
return Convert(CTLineGetImageBounds(lines_.back(), nullptr)).GetRightTop();
}
TextHitTestResult OsxCTTextLayout::HitTest(const Point& point) {
for (int i = 0; i < line_count_; i++) {
auto line = lines_[i];
const auto& line_origin = line_origins_[i];
auto bounds = Convert(CTLineGetImageBounds(line, nullptr));
bounds.left += line_origin.x;
bounds.top += line_origin.y;
if (bounds.IsPointInside(point)) {
int position = CTLineGetStringIndexForPosition(
line, CGPointMake(point.x - line_origin.x, point.y - line_origin.y));
return TextHitTestResult{position, false, true};
}
}
return TextHitTestResult{0, false, false};
}
void OsxCTTextLayout::RecreateFrame() {
auto attributed_string = CFAttributedStringCreateMutable(nullptr, 0);
CFAttributedStringReplaceString(attributed_string, CFRangeMake(0, 0),
cf_text_);
CFAttributedStringSetAttribute(attributed_string,
CFRangeMake(0, CFStringGetLength(cf_text_)),
kCTFontAttributeName, font_->GetCTFont());
ct_framesetter_ = CTFramesetterCreateWithAttributedString(attributed_string);
auto path = CGPathCreateMutable();
CGPathAddRect(path, nullptr, CGRectMake(0, 0, max_width_, max_height_));
ct_frame_ = CTFramesetterCreateFrame(
ct_framesetter_, CFRangeMake(0, CFStringGetLength(cf_text_)), path,
nullptr);
CFRelease(attributed_string);
CGPathRelease(path);
const auto lines = CTFrameGetLines(ct_frame_);
line_count_ = CFArrayGetCount(lines);
lines_.resize(line_count_);
line_origins_.resize(line_count_);
CTFrameGetLineOrigins(ct_frame_, CFRangeMake(0, 0), line_origins_.data());
for (int i = 0; i < line_count_; i++) {
lines_[i] = static_cast<CTLineRef>(CFArrayGetValueAtIndex(lines, i));
}
}
} // namespace cru::platform::graphics::osx::quartz
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