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bc77f84359
Also use the parse_css_value() helper in cases where we previously constructed a Parser manually.
81 lines
4.3 KiB
C++
81 lines
4.3 KiB
C++
/*
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* Copyright (c) 2023, Bastiaan van der Plaat <bastiaan.v.d.plaat@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/StyleComputer.h>
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#include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/Canvas/CanvasState.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/canvas.html#canvastextdrawingstyles
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template<typename IncludingClass>
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class CanvasTextDrawingStyles {
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public:
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~CanvasTextDrawingStyles() = default;
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ByteString font() const
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{
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// When font style value is empty return default string
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if (!my_drawing_state().font_style_value) {
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return "10px sans-serif";
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}
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// On getting, the font attribute must return the serialized form of the current font of the context (with no 'line-height' component).
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auto const& font_style_value = my_drawing_state().font_style_value->as_shorthand();
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auto font_style = font_style_value.longhand(CSS::PropertyID::FontStyle);
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auto font_weight = font_style_value.longhand(CSS::PropertyID::FontWeight);
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auto font_size = font_style_value.longhand(CSS::PropertyID::FontSize);
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auto font_family = font_style_value.longhand(CSS::PropertyID::FontFamily);
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return ByteString::formatted("{} {} {} {}", font_style->to_string(), font_weight->to_string(), font_size->to_string(), font_family->to_string());
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}
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void set_font(StringView font)
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{
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// The font IDL attribute, on setting, must be parsed as a CSS <'font'> value (but without supporting property-independent style sheet syntax like 'inherit'),
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// and the resulting font must be assigned to the context, with the 'line-height' component forced to 'normal', with the 'font-size' component converted to CSS pixels,
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// and with system fonts being computed to explicit values.
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// FIXME: with the 'line-height' component forced to 'normal'
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// FIXME: with the 'font-size' component converted to CSS pixels
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auto font_style_value_result = parse_css_value(CSS::Parser::ParsingContext {}, font, CSS::PropertyID::Font);
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// If the new value is syntactically incorrect (including using property-independent style sheet syntax like 'inherit' or 'initial'), then it must be ignored, without assigning a new font value.
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// NOTE: ShorthandStyleValue should be the only valid option here. We implicitly VERIFY this below.
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if (!font_style_value_result || !font_style_value_result->is_shorthand()) {
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return;
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}
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my_drawing_state().font_style_value = font_style_value_result.release_nonnull();
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// Load font with font style value properties
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auto const& font_style_value = my_drawing_state().font_style_value->as_shorthand();
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auto& canvas_element = reinterpret_cast<IncludingClass&>(*this).canvas_element();
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auto& font_style = *font_style_value.longhand(CSS::PropertyID::FontStyle);
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auto& font_weight = *font_style_value.longhand(CSS::PropertyID::FontWeight);
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auto& font_width = *font_style_value.longhand(CSS::PropertyID::FontWidth);
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auto& font_size = *font_style_value.longhand(CSS::PropertyID::FontSize);
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auto& font_family = *font_style_value.longhand(CSS::PropertyID::FontFamily);
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auto font_list = canvas_element.document().style_computer().compute_font_for_style_values(&canvas_element, {}, font_family, font_size, font_style, font_weight, font_width);
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my_drawing_state().current_font = font_list->first();
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}
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Bindings::CanvasTextAlign text_align() const { return my_drawing_state().text_align; }
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void set_text_align(Bindings::CanvasTextAlign text_align) { my_drawing_state().text_align = text_align; }
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Bindings::CanvasTextBaseline text_baseline() const { return my_drawing_state().text_baseline; }
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void set_text_baseline(Bindings::CanvasTextBaseline text_baseline) { my_drawing_state().text_baseline = text_baseline; }
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protected:
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CanvasTextDrawingStyles() = default;
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private:
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CanvasState::DrawingState& my_drawing_state() { return reinterpret_cast<IncludingClass&>(*this).drawing_state(); }
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CanvasState::DrawingState const& my_drawing_state() const { return reinterpret_cast<IncludingClass const&>(*this).drawing_state(); }
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};
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}
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