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#include "cru/ui/render/TextRenderObject.h"
#include "../Helper.h"
#include "cru/base/log/Logger.h"
#include "cru/platform/graphics/Factory.h"
#include "cru/platform/graphics/Painter.h"
#include "cru/platform/graphics/TextLayout.h"
#include "cru/ui/DebugFlags.h"
#include "cru/ui/render/RenderObject.h"
#include <algorithm>
#include <limits>
namespace cru::ui::render {
TextRenderObject::TextRenderObject(
std::shared_ptr<platform::graphics::IBrush> brush,
std::shared_ptr<platform::graphics::IFont> font,
std::shared_ptr<platform::graphics::IBrush> selection_brush,
std::shared_ptr<platform::graphics::IBrush> caret_brush) {
Expects(brush);
Expects(font);
Expects(selection_brush);
Expects(caret_brush);
brush.swap(brush_);
font.swap(font_);
selection_brush.swap(selection_brush_);
caret_brush.swap(caret_brush_);
const auto graph_factory = GetGraphicsFactory();
text_layout_ = graph_factory->CreateTextLayout(font_, u"");
}
TextRenderObject::~TextRenderObject() = default;
String TextRenderObject::GetText() const { return text_layout_->GetText(); }
void TextRenderObject::SetText(String new_text) {
text_layout_->SetText(std::move(new_text));
InvalidateLayout();
}
void TextRenderObject::SetBrush(
std::shared_ptr<platform::graphics::IBrush> new_brush) {
Expects(new_brush);
new_brush.swap(brush_);
InvalidatePaint();
}
std::shared_ptr<platform::graphics::IFont> TextRenderObject::GetFont() const {
return text_layout_->GetFont();
}
void TextRenderObject::SetFont(
std::shared_ptr<platform::graphics::IFont> font) {
Expects(font);
text_layout_->SetFont(std::move(font));
}
bool TextRenderObject::IsEditMode() { return text_layout_->IsEditMode(); }
void TextRenderObject::SetEditMode(bool enable) {
text_layout_->SetEditMode(enable);
}
Index TextRenderObject::GetLineCount() { return text_layout_->GetLineCount(); }
Index TextRenderObject::GetLineIndexFromCharIndex(Index char_index) {
return text_layout_->GetLineIndexFromCharIndex(char_index);
}
float TextRenderObject::GetLineHeight(Index line_index) {
return text_layout_->GetLineHeight(line_index);
}
std::vector<Rect> TextRenderObject::TextRangeRect(const TextRange& text_range) {
return text_layout_->TextRangeRect(text_range);
}
Rect TextRenderObject::TextSinglePoint(Index position, bool trailing) {
return text_layout_->TextSinglePoint(position, trailing);
}
platform::graphics::TextHitTestResult TextRenderObject::TextHitTest(
const Point& point) {
return text_layout_->HitTest(point);
}
void TextRenderObject::SetSelectionRange(std::optional<TextRange> new_range) {
selection_range_ = std::move(new_range);
InvalidatePaint();
}
void TextRenderObject::SetSelectionBrush(
std::shared_ptr<platform::graphics::IBrush> new_brush) {
Expects(new_brush);
new_brush.swap(selection_brush_);
if (selection_range_ && selection_range_->count) {
InvalidatePaint();
}
}
void TextRenderObject::SetDrawCaret(bool draw_caret) {
if (draw_caret_ != draw_caret) {
draw_caret_ = draw_caret;
InvalidatePaint();
}
}
void TextRenderObject::SetCaretPosition(Index position) {
if (position != caret_position_) {
caret_position_ = position;
if (draw_caret_) {
InvalidatePaint();
}
}
}
void TextRenderObject::GetCaretBrush(
std::shared_ptr<platform::graphics::IBrush> brush) {
Expects(brush);
brush.swap(caret_brush_);
if (draw_caret_) {
InvalidatePaint();
}
}
void TextRenderObject::SetCaretWidth(const float width) {
Expects(width >= 0.0f);
caret_width_ = width;
if (draw_caret_) {
InvalidatePaint();
}
}
Rect TextRenderObject::GetCaretRectInContent() {
auto caret_pos = this->caret_position_;
Index text_size = this->GetText().size();
if (caret_pos < 0) {
caret_pos = 0;
} else if (caret_pos > text_size) {
caret_pos = text_size;
}
const auto caret_top_center =
this->text_layout_->TextSinglePoint(caret_pos, false);
const auto caret_width = this->caret_width_;
auto rect = Rect{caret_top_center.left - caret_width / 2.0f,
caret_top_center.top, caret_width, caret_top_center.height};
return rect;
}
Rect TextRenderObject::GetCaretRect() {
auto rect = GetCaretRectInContent();
const auto content_rect = GetContentRect();
rect.left += content_rect.left;
rect.top += content_rect.top;
return rect;
}
void TextRenderObject::SetMeasureIncludingTrailingSpace(bool including) {
if (is_measure_including_trailing_space_ == including) return;
is_measure_including_trailing_space_ = including;
InvalidateLayout();
}
RenderObject* TextRenderObject::HitTest(const Point& point) {
const auto padding_rect = GetPaddingRect();
return padding_rect.IsPointInside(point) ? this : nullptr;
}
void TextRenderObject::Draw(platform::graphics::IPainter* painter) {
if constexpr (debug_flags::draw) {
CRU_LOG_TAG_DEBUG(
u"Begin to paint, total_offset: {}, size: {}, text_layout: "
u"{}, brush: {}.",
this->GetTotalOffset(), this->GetDesiredSize(),
this->text_layout_->GetDebugString(), this->brush_->GetDebugString());
}
if (this->selection_range_.has_value()) {
const auto&& rects =
text_layout_->TextRangeRect(this->selection_range_.value());
for (const auto& rect : rects)
painter->FillRectangle(rect, this->GetSelectionBrush().get());
}
painter->DrawText(Point{}, text_layout_.get(), brush_.get());
if (this->draw_caret_ && this->caret_width_ != 0.0f) {
painter->FillRectangle(GetCaretRectInContent(), this->caret_brush_.get());
}
}
Size TextRenderObject::OnMeasureContent(const MeasureRequirement& requirement,
const MeasureSize& preferred_size) {
float measure_width;
if (preferred_size.width.IsSpecified())
measure_width = preferred_size.width.GetLengthOrUndefined();
else
measure_width = requirement.max.width.GetLengthOrMax();
text_layout_->SetMaxWidth(measure_width);
text_layout_->SetMaxHeight(std::numeric_limits<float>::max());
const Size text_size(
text_layout_->GetTextBounds(is_measure_including_trailing_space_)
.GetRightBottom());
auto result = text_size;
result.width = std::max(result.width, preferred_size.width.GetLengthOr0());
result.width = std::max(result.width, requirement.min.width.GetLengthOr0());
result.width = std::min(result.width, requirement.max.width.GetLengthOrMax());
result.height = std::max(result.height, preferred_size.height.GetLengthOr0());
result.height =
std::max(result.height, requirement.min.height.GetLengthOr0());
result.height =
std::min(result.height, requirement.max.height.GetLengthOrMax());
return result;
}
Size TextRenderObject::OnMeasureContent1(const BoxConstraint& constraint) {
text_layout_->SetMaxWidth(constraint.max.width);
text_layout_->SetMaxHeight(std::numeric_limits<float>::max());
const Size text_size(
text_layout_->GetTextBounds(is_measure_including_trailing_space_)
.GetRightBottom());
return constraint.Coerce(text_size);
}
void TextRenderObject::OnLayoutContent(const Rect& content_rect) {
CRU_UNUSED(content_rect)
}
} // namespace cru::ui::render
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