float ScrollView::calculate_preferred_height(Canvas &canvas, float width)
{
if (style_cascade().computed_value("height").is_length())
return style_cascade().computed_value("height").number();
float height = impl->content_container->get_preferred_height(canvas, width);
if (impl->overflow_y == ContentOverflow::scroll)
height += impl->scroll_x->get_preferred_height(canvas, width);
return height;
}
float LabelView::calculate_preferred_height(Canvas &canvas, float width)
{
if (style_cascade().computed_value("height").is_keyword("auto"))
{
Font font = impl->get_font(this, canvas);
return font.get_font_metrics(canvas).get_line_height();
}
else
return style_cascade().computed_value("height").number();
}
float ScrollView::calculate_preferred_width(Canvas &canvas)
{
if (style_cascade().computed_value("width").is_length())
return style_cascade().computed_value("width").number();
float width = impl->content_container->get_preferred_width(canvas);
if (impl->overflow_x == ContentOverflow::scroll)
width += impl->scroll_x->get_preferred_width(canvas);
return width;
}
float LabelView::calculate_preferred_width(Canvas &canvas)
{
if (style_cascade().computed_value("width").is_keyword("auto"))
{
Font font = impl->get_font(this, canvas);
return font.measure_text(canvas, impl->_text).advance.width + 1.0f;
}
else
return style_cascade().computed_value("width").number();
}
void LabelView::render_content(Canvas &canvas)
{
Font font = impl->get_font(this, canvas);
FontMetrics font_metrics = font.get_font_metrics(canvas);
float baseline = font_metrics.get_baseline_offset();
std::string clipped_text = impl->_text;
GlyphMetrics advance = font.measure_text(canvas, clipped_text);
if (advance.advance.width > geometry().content_width)
{
std::string ellipsis = StringHelp::unicode_to_utf8(0x2026);
GlyphMetrics ellipsis_advance = font.measure_text(canvas, ellipsis);
switch (impl->_line_break_mode)
{
case LineBreakMode::clipping:
clipped_text = clipped_text.substr(0, font.clip_from_left(canvas, clipped_text, geometry().content_width));
break;
case LineBreakMode::truncating_head:
clipped_text = ellipsis + clipped_text.substr(font.clip_from_right(canvas, clipped_text, geometry().content_width - ellipsis_advance.advance.width));
break;
case LineBreakMode::truncating_middle:
{
std::string text_left = clipped_text.substr(0, font.clip_from_left(canvas, clipped_text, geometry().content_width * 0.5f - ellipsis_advance.advance.width));
std::string text_right = clipped_text.substr(font.clip_from_right(canvas, clipped_text, geometry().content_width * 0.5f - ellipsis_advance.advance.width));
clipped_text = text_left + ellipsis + text_right;
}
break;
case LineBreakMode::truncating_tail:
clipped_text = clipped_text.substr(0, font.clip_from_left(canvas, clipped_text, geometry().content_width - ellipsis_advance.advance.width)) + ellipsis;
break;
default:
break;
}
advance = font.measure_text(canvas, clipped_text);
if (advance.advance.width > geometry().content_width)
return; // Still no room. Draw nothing!
}
Colorf color = style_cascade().computed_value("color").color();
if (impl->text_alignment == TextAlignment::left)
{
font.draw_text(canvas, Pointf(0.0f, baseline), clipped_text, color);
}
else if (impl->text_alignment == TextAlignment::right)
{
font.draw_text(canvas, Pointf(geometry().content_width - advance.advance.width, baseline), clipped_text, color);
}
else if (impl->text_alignment == TextAlignment::center)
{
font.draw_text(canvas, Pointf(std::round((geometry().content_width - advance.advance.width) * 0.5f), baseline), clipped_text, color);
}
}
void layout_subviews(Canvas &canvas) override
{
for (auto &view : subviews())
{
// To do: maybe we need a mode to specify if the X axis is locked or infinite
float width = geometry().content_width; //view->get_preferred_width(canvas);
float height = view->get_preferred_height(canvas, width);
ViewGeometry geometry = ViewGeometry::from_content_box(style_cascade(), Rectf(0.0f, 0.0f, width, height));
geometry.content_x = 0.0f;
geometry.content_y = 0.0f;
view->set_geometry(geometry);
view->layout_subviews(canvas); // Maybe this should be handled in View?
}
}
bool ScrollBarView::vertical() const
{
return style_cascade().computed_value("flex-direction").is_keyword("column");
}
void LabelView::layout_subviews(Canvas &canvas)
{
View::layout_subviews(canvas);
impl->font = style_cascade().get_font(canvas); // Reset the font on new layout
}
void LabelView::reset_font()
{
/// Reset the font.
impl->font = style_cascade().font(Canvas()); // Canvas actually is not needed in this case, use stub.
impl->font_color = style_cascade().computed_value("color").color();
}
