text_widget.hpp

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// text_widget.hpp
/*
  neogfx C++ App/Game Engine
  Copyright (c) 2015, 2020 Leigh Johnston.  All Rights Reserved.
  
  This program is free software: you can redistribute it and / or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
 
#include <neogfx/neogfx.hpp>
#include <neogfx/gui/widget/widget.hpp>
#include <neogfx/gui/widget/i_text_widget.hpp>
 
namespace neogfx
{
    class text_widget : public widget<i_text_widget>
    {
        meta_object(widget<i_text_widget>)
    public:
        define_event(TextChanged, text_changed)
        define_event(TextGeometryChanged, text_geometry_changed)
    private:
        typedef std::variant<std::monostate, neogfx::glyph_text, neogfx::multiline_glyph_text> glyph_text_t;
    public:
        text_widget(std::string const& aText = std::string{}, text_widget_type aType = text_widget_type::SingleLine, text_widget_flags aFlags = text_widget_flags::None);
        text_widget(i_widget& aParent, std::string const& aText = std::string{}, text_widget_type aType = text_widget_type::SingleLine, text_widget_flags aFlags = text_widget_flags::None);
        text_widget(i_layout& aLayout, std::string const& aText = std::string{}, text_widget_type aType = text_widget_type::SingleLine, text_widget_flags aFlags = text_widget_flags::None);
        ~text_widget();
    public:
        neogfx::size_policy size_policy() const override;
        size minimum_size(optional_size const& aAvailableSpace = optional_size{}) const override;
    public:
        void paint(i_graphics_context& aGc) const override;
    public:
        void set_font(optional_font const& aFont) override;
    public:
        bool visible() const override;
    public:
        i_string const& text() const override;
        void set_text(i_string const& aText) override;
        void set_size_hint(const size_hint& aSizeHint) override;
        bool multi_line() const override;
        text_widget_flags flags() const override;
        void set_flags(text_widget_flags aFlags) override;
        neogfx::alignment alignment() const override;
        void set_alignment(neogfx::alignment aAlignment, bool aUpdateLayout = true) override;
        bool has_text_color() const override;
        color text_color() const override;
        void set_text_color(const optional_color& aTextColor) override;
        bool has_text_format() const override;
        neogfx::text_format text_format() const override;
        void set_text_format(const optional_text_format& aTextAppearance) override;
    protected:
        size text_extent() const;
        size size_hint_extent() const;
    private:
        void init();
        const glyph_text_t& glyph_text() const;
        void reset_cache();
    private:
        string iText;
        mutable glyph_text_t iGlyphText;
        mutable optional_size iTextExtent;
        size_hint iSizeHint;
        mutable optional_size iSizeHintExtent;
        text_widget_type iType;
        text_widget_flags iFlags;
        neogfx::alignment iAlignment;
        optional_text_format iTextAppearance;
        sink iSink;
    };
}