source: trunk/src/gui/gui_environment.cc @ 268

// Copyright (C) 2012-2013 ChaosForge / Kornel Kisielewicz
// http://chaosforge.org/
//
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#include "nv/gui/gui_environment.hh"

#include "nv/gui/gui_renderer.hh"


        /*

        TODO: parse a lua stylesheet as per Trac wiki

        IDEA: Store everything in std::unordered_maps, with lua_value's?

        A lua_value is a variant stores strings as const char* that deletes them on destructor?
        Question is that there might not be much gained on speed anyway, due to Lua's speed.
        Special function field allows delayed per parse execution?

        */

#include "nv/gfx/sliced_buffer.hh"
#include "nv/gfx/texture_atlas.hh"

nv::gui::environment::environment( window* w, const std::string& shader_path )
        : m_renderer( nullptr ), m_window( w ), m_screen( nullptr )
{
        m_area.dim( dimension( w->get_width(), w->get_height() ) );
        m_screen = new element( m_area );
        m_renderer = new renderer( w, shader_path );
}

void nv::gui::environment::load_style( const std::string& filename )
{
        m_renderer->load_style( filename );
}

nv::gui::element* nv::gui::environment::create_element( element* parent, const rectangle& r )
{
        element* result = new element( r );
        if ( parent == nullptr ) parent = m_screen;
        add_child( parent, result );
        return result;
}

void nv::gui::environment::destroy_element( element* e )
{
        destroy_children( e );
        if ( e->m_parent ) 
        {
                remove_child( e->m_parent, e );
        }
        delete e;
}

void nv::gui::environment::update( element* e, uint32 elapsed )
{
//      e->on_update( elapsed );
        if ( e->m_visible )
        {
                for ( element* i : e->m_children )
                {
                        update( i, elapsed );
                }
        }
        if ( e->m_dirty || e->m_render_data == nullptr )
        {
                m_renderer->redraw( e, elapsed );
                e->m_dirty = false;
        }
}

void nv::gui::environment::draw( element* e )
{
        if ( e->m_visible )
        {
//              e->on_draw();
                m_renderer->draw( e );
                for ( element* i : e->m_children )
                {
                        draw(i);
                }
        }
}

void nv::gui::environment::update()
{
        update( m_screen, 0 );
}

void nv::gui::environment::draw()
{
        draw( m_screen );
        m_renderer->draw();
}

void nv::gui::environment::add_child( element* child )
{
        add_child( m_screen, child );
}

void nv::gui::environment::add_child( element* parent, element* child )
{
        if ( child )
        {
                if ( child->m_parent )
                {
                        remove_child( child->m_parent, child );
                }
                child->m_parent = parent;
                parent->m_children.push_back( child );
                parent->m_child_count++;
        }
}

void nv::gui::environment::destroy_children( element* e )
{
        while ( !e->m_children.empty() )
        {
                destroy_element( e->m_children.front() );
        }
}


nv::gui::environment::~environment()
{
        destroy_element( m_screen );
        delete m_renderer;
}

bool nv::gui::environment::process_io_event( const io_event& )
{
        return false;
}

bool nv::gui::environment::process_io_event( element* e, const io_event& ev )
{
        return e->m_parent ? process_io_event( e->m_parent, ev ) : false;
}

nv::gui::element* nv::gui::environment::get_element( const position& p )
{
        return get_deepest_child( m_screen, p );
}

nv::gui::element* nv::gui::environment::get_deepest_child( element* e, const position& p )
{
        if ( !e->m_visible ) return nullptr;

        element* result = nullptr;
        element::list::reverse_iterator it = e->m_children.rbegin();

        while ( it != e->m_children.rend() )
        {
                result = get_deepest_child( *it, p );
                if ( result ) return result;
                ++it;
        }

        if ( e->m_absolute.contains(p) ) return e;
        return nullptr;
}

void nv::gui::environment::move_to_top( element* child )
{
        element* parent = child->m_parent;
        if ( parent )
        {
                auto it = std::find( parent->m_children.begin(), parent->m_children.end(), child );
                if ( it != parent->m_children.end() )
                {
                        parent->m_children.erase( it );
                        parent->m_children.push_back( child );
                        parent->m_dirty = true;
                }       
        }
}

void nv::gui::environment::move_to_bottom( element* child )
{
        element* parent = child->m_parent;
        if ( parent )
        {
                auto it = std::find( parent->m_children.begin(), parent->m_children.end(), child );
                if ( it != parent->m_children.end() )
                {
                        parent->m_children.erase( it );
                        parent->m_children.push_front( child );
                        parent->m_dirty = true;
                }
        }
}

void nv::gui::environment::set_relative( element* e, const rectangle& r )
{
        e->m_dirty    = true;
        e->m_relative = r;
        recalculate_absolute( e );
}

void nv::gui::environment::set_relative( element* e, const position& p )
{
        set_relative( e, rectangle( p, p + e->m_relative.get_size() ) );
}

void nv::gui::environment::recalculate_absolute( element* e )
{
        rectangle pabsolute;

        if ( e->m_parent )
        {
                pabsolute = e->m_parent->m_absolute;
        }

        e->m_absolute = e->m_relative + pabsolute.ul;

        for ( element* o : e->m_children )
        {
                recalculate_absolute( o );
        }
}

void nv::gui::environment::set_class( element* e, const string& text )
{
        e->m_class = text;
        e->m_dirty = true;
}

void nv::gui::environment::set_text( element* e, const string& text )
{
        e->m_text = text;
        e->m_dirty = true;
}

void nv::gui::environment::remove_child( element* parent, element* child )
{
        if ( child->m_parent != parent )
        {
                return; // signal error?
        }
        auto it = std::find( parent->m_children.begin(), parent->m_children.end(), child );
        if ( it != parent->m_children.end() )
        {
                (*it)->m_parent = nullptr;
                parent->m_children.erase(it);
        }       

}