162 lines
4.0 KiB
C++
162 lines
4.0 KiB
C++
/*
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* \brief Widget that displays a single line of plain text
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* \author Norman Feske
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* \date 2009-09-11
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*/
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/*
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* Copyright (C) 2014-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _LABEL_WIDGET_H_
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#define _LABEL_WIDGET_H_
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/* local includes */
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#include <widget_factory.h>
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#include <text_selection.h>
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namespace Menu_view { struct Label_widget; }
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struct Menu_view::Label_widget : Widget, Cursor::Glyph_position
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{
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Text_painter::Font const *_font = nullptr;
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enum { LABEL_MAX_LEN = 256 };
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typedef String<200> Text;
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Text _text { };
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int _min_width = 0;
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int _min_height = 0;
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Cursor::Model_update_policy _cursor_update_policy;
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Text_selection::Model_update_policy _selection_update_policy;
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List_model<Cursor> _cursors { };
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List_model<Text_selection> _selections { };
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Label_widget(Widget_factory &factory, Xml_node node, Unique_id unique_id)
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:
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Widget(factory, node, unique_id),
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_cursor_update_policy(factory, *this),
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_selection_update_policy(factory.alloc, *this)
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{ }
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~Label_widget()
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{
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_cursors .destroy_all_elements(_cursor_update_policy);
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_selections.destroy_all_elements(_selection_update_policy);
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}
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void update(Xml_node node) override
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{
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_font = _factory.styles.font(node);
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_text = Text("");
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_min_width = 0;
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_min_height = 0;
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if (node.has_attribute("text")) {
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_text = node.attribute_value("text", _text);
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_text = Xml_unquoted(_text);
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_min_height = _font->height();
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}
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unsigned const min_ex = node.attribute_value("min_ex", 0U);
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if (min_ex) {
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Glyph_painter::Fixpoint_number min_w_px = _font->string_width("x");
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min_w_px.value *= min_ex;
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_min_width = min_w_px.decimal();
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}
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_cursors .update_from_xml(_cursor_update_policy, node);
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_selections.update_from_xml(_selection_update_policy, node);
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}
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Area min_size() const override
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{
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if (!_font)
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return Area(0, 0);
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return Area(max(_font->string_width(_text.string()).decimal(), _min_width),
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_min_height);
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}
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void draw(Surface<Pixel_rgb888> &pixel_surface,
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Surface<Pixel_alpha8> &alpha_surface,
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Point at) const override
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{
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if (!_font) return;
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Area text_size = min_size();
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int const dx = (int)geometry().w() - text_size.w(),
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dy = (int)geometry().h() - text_size.h();
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Point const centered = at + Point(dx/2, dy/2);
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_selections.for_each([&] (Text_selection const &selection) {
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selection.draw(pixel_surface, alpha_surface, at, text_size.h()); });
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Text_painter::paint(pixel_surface,
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Text_painter::Position(centered.x(), centered.y()),
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*_font, Color(0, 0, 0), _text.string());
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Text_painter::paint(alpha_surface,
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Text_painter::Position(centered.x(), centered.y()),
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*_font, Color(255, 255, 255), _text.string());
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_cursors.for_each([&] (Cursor const &cursor) {
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cursor.draw(pixel_surface, alpha_surface, at, text_size.h()); });
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}
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/**
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* Cursor::Glyph_position interface
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*/
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int xpos_of_glyph(unsigned at) const override
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{
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return _font->string_width(_text.string(), at).decimal();
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}
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unsigned _char_index_at_xpos(unsigned xpos) const
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{
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return _font->index_at_xpos(_text.string(), xpos);
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}
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Hovered hovered(Point at) const override
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{
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Unique_id const hovered_id = Widget::hovered(at).unique_id;
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if (!hovered_id.valid())
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return Hovered { .unique_id = hovered_id, .detail = { } };
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return { .unique_id = hovered_id,
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.detail = { _char_index_at_xpos(at.x()) } };
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}
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void gen_hover_model(Xml_generator &xml, Point at) const override
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{
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if (_inner_geometry().contains(at)) {
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xml.node(_type_name.string(), [&]() {
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_gen_common_hover_attr(xml);
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xml.attribute("at", _char_index_at_xpos(at.x()));
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});
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}
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}
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private:
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/**
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* Noncopyable
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*/
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Label_widget(Label_widget const &);
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Label_widget &operator = (Label_widget const &);
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};
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#endif /* _LABEL_WIDGET_H_ */
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