AtomicGameEngine/Source/Atomic/UI/TBUI.cpp

#include "Precompiled.h"

#ifdef ATOMIC_TBUI

#include "../Core/Context.h"
#include "../Core/CoreEvents.h"
#include "../Core/Profiler.h"
#include "../IO/Log.h"
#include "../IO/File.h"
#include "../Resource/ResourceCache.h"
#include "../Graphics/Graphics.h"
#include "../Graphics/GraphicsEvents.h"
#include "../Graphics/Texture2D.h"
#include "../Graphics/VertexBuffer.h"
#include "../Input/Input.h"
#include "../Input/InputEvents.h"
#include "../UI/UI.h"
#include "../UI/TBUI.h"

#include <TurboBadger/tb_core.h>
#include <TurboBadger/tb_system.h>
#include <TurboBadger/tb_debug.h>
#include <TurboBadger/animation/tb_widget_animation.h>
#include <TurboBadger/renderers/tb_renderer_batcher.h>
#include <TurboBadger/tb_font_renderer.h>
#include <TurboBadger/tb_node_tree.h>
#include <TurboBadger/tb_widgets_reader.h>
#include <TurboBadger/tb_window.h>


void register_tbbf_font_renderer();
void register_stb_font_renderer();
void register_freetype_font_renderer();

using namespace tb;

namespace tb
{

void TBSystem::RescheduleTimer(double fire_time)
{

}

}

namespace Atomic
{

extern const char* UI_CATEGORY;

static MODIFIER_KEYS GetModifierKeys(int qualifiers, bool superKey)
{
    MODIFIER_KEYS code = TB_MODIFIER_NONE;
    if (qualifiers & QUAL_ALT)	code |= TB_ALT;
    if (qualifiers & QUAL_CTRL)	code |= TB_CTRL;
    if (qualifiers & QUAL_SHIFT)	code |= TB_SHIFT;
    if (superKey)	code |= TB_SUPER;
    return code;
}


// @return Return the upper case of a ascii charcter. Only for shortcut handling.
static int toupr_ascii(int ascii)
{
    if (ascii >= 'a' && ascii <= 'z')
        return ascii + 'A' - 'a';
    return ascii;
}


class TBUIRenderer;

class TBUIBitmap : public tb::TBBitmap
{
public:
    TBUIBitmap(TBUIRenderer *renderer);
    virtual ~TBUIBitmap();

    bool Init(int width, int height, tb::uint32 *data);

    virtual int Width() { return width_; }
    virtual int Height() { return height_; }
    virtual void SetData(tb::uint32 *data);
public:

    TBUIRenderer *renderer_;
    int width_;
    int height_;
    SharedPtr<Texture2D> texture_;
};

TBUIBitmap::TBUIBitmap(TBUIRenderer *renderer)
    : renderer_(renderer), width_(0), height_(0)
{
}



class TBUIRenderer : public TBRendererBatcher
{
public:

    WeakPtr<Context> context_;
    WeakPtr<TBUI> tbui_;
    PODVector<UIBatch>* batches_;
    PODVector<float>* vertexData_;
    IntRect currentScissor_;

    TBUIRenderer(Context* context)
    {
        context_ = context;
    }

    virtual ~TBUIRenderer()
    {

    }

    void BeginPaint(int render_target_w, int render_target_h)
    {
        TBRendererBatcher::BeginPaint(render_target_w, render_target_h);
    }

    void EndPaint()
    {
        TBRendererBatcher::EndPaint();
    }

    TBBitmap *CreateBitmap(int width, int height, uint32 *data)
    {
        TBUIBitmap *bitmap = new TBUIBitmap(this);

        if (!bitmap->Init(width, height, data))
        {
            delete bitmap;
            return nullptr;
        }

        return bitmap;
    }

    void RenderBatch(Batch *batch)
    {
        if (!batch->vertex_count)
            return;

        Texture2D* texture = NULL;

        if (batch->bitmap)
        {
            TBUIBitmap* tbuibitmap = (TBUIBitmap*)batch->bitmap;
            texture = tbuibitmap->texture_;
        }

        UIBatch b(tbui_, BLEND_ALPHA , currentScissor_, texture, vertexData_);

        float fadeAlpha = tbui_->GetFadeAlpha();

        unsigned begin = b.vertexData_->Size();
        b.vertexData_->Resize(begin + batch->vertex_count * UI_VERTEX_SIZE);
        float* dest = &(b.vertexData_->At(begin));
        b.vertexEnd_ = b.vertexData_->Size();

        // winding is reversed, however switching it causes rendering
        // issues, so turned off culling in UI module
        //for (int i = batch->vertex_count - 1; i >= 0; i--)
        for (int i = 0; i < batch->vertex_count; i++)
        {
            Vertex* v = &batch->vertex[i];
            dest[0] = v->x; dest[1] = v->y; dest[2] = 0.0f;

            v->a *= fadeAlpha;

            ((unsigned&)dest[3]) = v->col;
            dest[4] = v->u; dest[5] = v->v;
            dest += UI_VERTEX_SIZE;
        }

        UIBatch::AddOrMerge(b, *batches_);
    }

    void SetClipRect(const TBRect &rect)
    {
        currentScissor_.top_ = rect.y;
        currentScissor_.bottom_ = rect.y + rect.h;
        currentScissor_.left_ = rect.x;
        currentScissor_.right_ = rect.x + rect.w;

    }

    static TBUIRenderer* renderer_;

};

TBUIRenderer* TBUIRenderer::renderer_ = NULL;

TBUIBitmap::~TBUIBitmap()
{
    // Must flush and unbind before we delete the texture
    renderer_->FlushBitmap(this);
}

bool TBUIBitmap::Init(int width, int height, tb::uint32 *data)
{
    assert(width == tb::TBGetNearestPowerOfTwo(width));
    assert(height == tb::TBGetNearestPowerOfTwo(height));

    width_ = width;
    height_ = height;

    texture_ = new Texture2D(renderer_->context_);
    texture_->SetMipsToSkip(QUALITY_LOW, 0); // No quality reduction
    texture_->SetNumLevels(1);
    texture_->SetAddressMode(COORD_U, ADDRESS_BORDER);
    texture_->SetAddressMode(COORD_V, ADDRESS_BORDER),
    texture_->SetBorderColor(Color(0.0f, 0.0f, 0.0f, 0.0f));
    texture_->SetSize(width_, height_,  Graphics::GetRGBAFormat(), TEXTURE_STATIC);

    SetData(data);

    return true;
}

void TBUIBitmap::SetData(tb::uint32 *data)
{   
    renderer_->FlushBitmap(this);
    texture_->SetData(0, 0, 0, width_, height_, data);
}

class TBUIRootWidget : public TBWidget
{
public:


};

WeakPtr<Context> TBUI::readerContext_;

TBUI::TBUI(Context* context) :
    UIElement(context),
    rootWidget_(0),
    initialized_(false),
    inputDisabled_(false),
    keyboardDisabled_(false),
    fadeAlpha_(1.0f),
    fadeTarget_(1.0f),
    currentFadeTime_(0.0f),
    fadeTime_(0.0f),
    shuttingDown_(false)
{
    SubscribeToEvent(E_SCREENMODE, HANDLER(TBUI, HandleScreenMode));
}

TBUI::~TBUI()
{
    if (initialized_)
    {
        tb::TBWidgetsAnimationManager::Shutdown();
        delete rootWidget_;
        // leak
        //delete TBUIRenderer::renderer_;
        tb_core_shutdown();
    }
}

void TBUI::Initialize()
{
    assert(!initialized_);

    Graphics* graphics = GetSubsystem<Graphics>();
    assert(graphics);
    assert(graphics->IsInitialized());

    readerContext_ = context_;
    TBFile::SetReaderFunction(TBFileReader);

    graphics_ = graphics;
    vertexBuffer_ = new VertexBuffer(context_);

    TBWidgetsAnimationManager::Init();
    TBUIRenderer::renderer_ = new TBUIRenderer(graphics->GetContext());
    TBUIRenderer::renderer_->tbui_ = this;
    tb_core_init(TBUIRenderer::renderer_, "AtomicEditor/resources/language/lng_en.tb.txt");

    // Load the default skin, and override skin that contains the graphics specific to the demo.
    tb::g_tb_skin->Load("AtomicEditor/resources/default_skin/skin.tb.txt", "AtomicEditor/editor/skin/skin.tb.txt");

    //register_tbbf_font_renderer();
    //register_stb_font_renderer();
    register_freetype_font_renderer();

    tb::g_font_manager->AddFontInfo("AtomicEditor/resources/MesloLGS-Regular.ttf", "Monaco");
    tb::g_font_manager->AddFontInfo("AtomicEditor/resources/vera.ttf", "Vera");

    tb::TBFontDescription fd;
    fd.SetID(tb::TBIDC("Vera"));
    fd.SetSize(tb::g_tb_skin->GetDimensionConverter()->DpToPx(12));
    tb::g_font_manager->SetDefaultFontDescription(fd);

    // Create the font now.
    tb::TBFontFace *font = tb::g_font_manager->CreateFontFace(tb::g_font_manager->GetDefaultFontDescription());

    // Render some glyphs in one go now since we know we are going to use them. It would work fine
    // without this since glyphs are rendered when needed, but with some extra updating of the glyph bitmap.
    if (font)
        font->RenderGlyphs(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~•·åäöÅÄÖ");

    rootWidget_ = new TBUIRootWidget();
    //rootWidget_->SetSkinBg(tb::TBIDC("background"));

    int width = graphics->GetWidth();
    int height = graphics->GetHeight();
    rootWidget_->SetSize(width, height);
    SetSize(width, height);

    rootWidget_->SetVisibilility(tb::WIDGET_VISIBILITY_VISIBLE);

    SubscribeToEvent(E_MOUSEBUTTONDOWN, HANDLER(TBUI, HandleMouseButtonDown));
    SubscribeToEvent(E_MOUSEBUTTONUP, HANDLER(TBUI, HandleMouseButtonUp));
    SubscribeToEvent(E_MOUSEMOVE, HANDLER(TBUI, HandleMouseMove));
    SubscribeToEvent(E_MOUSEWHEEL, HANDLER(TBUI, HandleMouseWheel));
    SubscribeToEvent(E_KEYDOWN, HANDLER(TBUI, HandleKeyDown));
    SubscribeToEvent(E_KEYUP, HANDLER(TBUI, HandleKeyUp));
    SubscribeToEvent(E_TEXTINPUT, HANDLER(TBUI, HandleTextInput));
    SubscribeToEvent(E_UPDATE, HANDLER(TBUI, HandleUpdate));

    SubscribeToEvent(E_RENDERUPDATE, HANDLER(TBUI, HandleRenderUpdate));

    //TB_DEBUG_SETTING(LAYOUT_BOUNDS) = 1;

    initialized_ = true;
}

void TBUI::Shutdown()
{
    shuttingDown_ = true;
    SetInputDisabled(true);
}

void TBUI::GetBatches(PODVector<UIBatch>& batches, PODVector<float>& vertexData, const IntRect& currentScissor)
{
    if (!initialized_)
        return;

    TBAnimationManager::Update();
    rootWidget_->InvokeProcessStates();
    rootWidget_->InvokeProcess();

    if (fadeAlpha_ > 0.0f)
    {
        tb::g_renderer->BeginPaint(rootWidget_->GetRect().w, rootWidget_->GetRect().h);

        TBUIRenderer::renderer_->currentScissor_ = currentScissor;
        TBUIRenderer::renderer_->batches_ = &batches;
        TBUIRenderer::renderer_->vertexData_ = &vertexData;
        rootWidget_->InvokePaint(tb::TBWidget::PaintProps());

        tb::g_renderer->EndPaint();
    }
}

void TBUI::SubmitBatchVertexData(Texture* texture, const PODVector<float>& vertexData)
{
    UIBatch b(this, BLEND_ALPHA , TBUIRenderer::renderer_->currentScissor_, texture, &vertexData_);

    unsigned begin = b.vertexData_->Size();
    b.vertexData_->Resize(begin + vertexData.Size());
    float* dest = &(b.vertexData_->At(begin));
    b.vertexEnd_ = b.vertexData_->Size();

    for (unsigned i = 0; i < vertexData.Size(); i++, dest++)
    {
        *dest = vertexData[i];
    }

    UIBatch::AddOrMerge(b, batches_);

}

void TBUI::HandleScreenMode(StringHash eventType, VariantMap& eventData)
{
    if (!initialized_)
        return;

    using namespace ScreenMode;
    rootWidget_->SetSize(eventData[P_WIDTH].GetInt(), eventData[P_HEIGHT].GetInt());
    SetSize(eventData[P_WIDTH].GetInt(), eventData[P_HEIGHT].GetInt());
}

void TBUI::HandleMouseButtonDown(StringHash eventType, VariantMap& eventData)
{
    if (!initialized_ || inputDisabled_)
        return;

    using namespace MouseButtonDown;
    unsigned button = eventData[P_BUTTON].GetUInt();

    IntVector2 pos;
    pos = GetSubsystem<UI>()->GetCursorPosition();

    Input* input = GetSubsystem<Input>();
    int qualifiers = input->GetQualifiers();

#ifdef ATOMIC_PLATFORM_WINDOWS
    bool superdown = input->GetKeyDown(KEY_LCTRL) || input->GetKeyDown(KEY_RCTRL);
#else
    bool superdown = input->GetKeyDown(KEY_LGUI) || input->GetKeyDown(KEY_RGUI);
#endif

    MODIFIER_KEYS mod = GetModifierKeys(qualifiers, superdown);


    static double last_time = 0;
    static int counter = 1;

    Time* t = GetSubsystem<Time>();

    double time = t->GetElapsedTime() * 1000;
    if (time < last_time + 600)
        counter++;
    else
        counter = 1;

    last_time = time;
    if (button == MOUSEB_RIGHT)
        rootWidget_->InvokeRightPointerDown(pos.x_, pos.y_, counter, mod);
    else
        rootWidget_->InvokePointerDown(pos.x_, pos.y_, counter, mod, false);


}


void TBUI::HandleMouseButtonUp(StringHash eventType, VariantMap& eventData)
{
    if (!initialized_ || inputDisabled_)
        return;

    using namespace MouseButtonUp;
    unsigned button = eventData[P_BUTTON].GetUInt();

    IntVector2 pos;
    pos = GetSubsystem<UI>()->GetCursorPosition();
    Input* input = GetSubsystem<Input>();
    int qualifiers = input->GetQualifiers();

#ifdef ATOMIC_PLATFORM_WINDOWS
    bool superdown = input->GetKeyDown(KEY_LCTRL) || input->GetKeyDown(KEY_RCTRL);
#else
    bool superdown = input->GetKeyDown(KEY_LGUI) || input->GetKeyDown(KEY_RGUI);
#endif

    MODIFIER_KEYS mod = GetModifierKeys(qualifiers, superdown);


    if (button == MOUSEB_RIGHT)
        rootWidget_->InvokeRightPointerUp(pos.x_, pos.y_, mod);
    else
        rootWidget_->InvokePointerUp(pos.x_, pos.y_, mod, false);
}


void TBUI::HandleMouseMove(StringHash eventType, VariantMap& eventData)
{
    using namespace MouseMove;

    if (!initialized_ || inputDisabled_)
        return;

    int px = eventData[P_X].GetInt();
    int py = eventData[P_Y].GetInt();

    rootWidget_->InvokePointerMove(px, py, tb::TB_MODIFIER_NONE, false);

}


void TBUI::HandleMouseWheel(StringHash eventType, VariantMap& eventData)
{
    if (!initialized_ || inputDisabled_)
        return;

    using namespace MouseWheel;

    int delta = eventData[P_WHEEL].GetInt();

    Input* input = GetSubsystem<Input>();

    rootWidget_->InvokeWheel(input->GetMousePosition().x_, input->GetMousePosition().y_, 0, delta > 0 ? -1 : 1, tb::TB_MODIFIER_NONE);

}

static bool InvokeShortcut(int key, SPECIAL_KEY special_key, MODIFIER_KEYS modifierkeys, bool down)
{
#ifdef __APPLE__
    bool shortcut_key = (modifierkeys & TB_SUPER) ? true : false;
#else
    bool shortcut_key = (modifierkeys & TB_CTRL) ? true : false;
#endif
    if (!TBWidget::focused_widget || !down || (!shortcut_key && special_key ==TB_KEY_UNDEFINED))
        return false;
    bool reverse_key = (modifierkeys & TB_SHIFT) ? true : false;
    int upper_key = toupr_ascii(key);
    TBID id;
    if (upper_key == 'X')
        id = TBIDC("cut");
    else if (upper_key == 'C' || special_key == TB_KEY_INSERT)
        id = TBIDC("copy");
    else if (upper_key == 'V' || (special_key == TB_KEY_INSERT && reverse_key))
        id = TBIDC("paste");
    else if (upper_key == 'A')
        id = TBIDC("selectall");
    else if (upper_key == 'Z' || upper_key == 'Y')
    {
        bool undo = upper_key == 'Z';
        if (reverse_key)
            undo = !undo;
        id = undo ? TBIDC("undo") : TBIDC("redo");
    }
    else if (upper_key == 'N')
        id = TBIDC("new");
    else if (upper_key == 'O')
        id = TBIDC("open");
    else if (upper_key == 'S')
        id = TBIDC("save");
    else if (upper_key == 'W')
        id = TBIDC("close");
    else if (upper_key == 'F')
        id = TBIDC("find");
 #ifdef ATOMIC_PLATFORM_OSX
    else if (upper_key == 'G' && (modifierkeys & TB_SHIFT))
        id = TBIDC("findprev");
    else if (upper_key == 'G')
        id = TBIDC("findnext");
#else
    else if (special_key == TB_KEY_F3 && (modifierkeys & TB_SHIFT))
        id = TBIDC("findprev");
    else if (special_key == TB_KEY_F3)
        id = TBIDC("findnext");

#endif
    else if (upper_key == 'P')
        id = TBIDC("play");
    else if (upper_key == 'I')
        id = TBIDC("beautify");
    else if (special_key == TB_KEY_PAGE_UP)
        id = TBIDC("prev_doc");
    else if (special_key == TB_KEY_PAGE_DOWN)
        id = TBIDC("next_doc");
    else
        return false;

    TBWidgetEvent ev(EVENT_TYPE_SHORTCUT);
    ev.modifierkeys = modifierkeys;
    ev.ref_id = id;
    return TBWidget::focused_widget->InvokeEvent(ev);
}

static bool InvokeKey(TBWidget* root, unsigned int key, SPECIAL_KEY special_key, MODIFIER_KEYS modifierkeys, bool keydown)
{
    if (InvokeShortcut(key, special_key, modifierkeys, keydown))
        return true;
    root->InvokeKey(key, special_key, modifierkeys, keydown);
    return true;
}


void TBUI::HandleKey(bool keydown, int keycode, int scancode)
{

#ifdef ATOMIC_PLATFORM_WINDOWS
    if (keycode == KEY_LCTRL || keycode == KEY_RCTRL)
        return;
#else
    if (keycode == KEY_LGUI || keycode == KEY_RGUI)
        return;
#endif

    Input* input = GetSubsystem<Input>();
    int qualifiers = input->GetQualifiers();

#ifdef ATOMIC_PLATFORM_WINDOWS
    bool superdown = input->GetKeyDown(KEY_LCTRL) || input->GetKeyDown(KEY_RCTRL);
#else
    bool superdown = input->GetKeyDown(KEY_LGUI) || input->GetKeyDown(KEY_RGUI);
#endif
    MODIFIER_KEYS mod = GetModifierKeys(qualifiers, superdown);

    switch (keycode)
    {
    case KEY_RETURN:
    case KEY_RETURN2:
    case KEY_KP_ENTER:
        InvokeKey(rootWidget_, 0, TB_KEY_ENTER, mod, keydown);
        break;

    case KEY_F1:
        InvokeKey(rootWidget_, 0, TB_KEY_F1, mod, keydown);
        break;
    case KEY_F2:
        InvokeKey(rootWidget_, 0, TB_KEY_F2, mod, keydown);
        break;
    case KEY_F3:
        InvokeKey(rootWidget_, 0, TB_KEY_F3, mod, keydown);
        break;
    case KEY_F4:
        InvokeKey(rootWidget_, 0, TB_KEY_F4, mod, keydown);
        break;
    case KEY_F5:
        InvokeKey(rootWidget_, 0, TB_KEY_F5, mod, keydown);
        break;
    case KEY_F6:
        InvokeKey(rootWidget_, 0, TB_KEY_F6, mod, keydown);
        break;
    case KEY_F7:
        InvokeKey(rootWidget_, 0, TB_KEY_F7, mod, keydown);
        break;
    case KEY_F8:
        InvokeKey(rootWidget_, 0, TB_KEY_F8, mod, keydown);
        break;
    case KEY_F9:
        InvokeKey(rootWidget_, 0, TB_KEY_F9, mod, keydown);
        break;
    case KEY_F10:
        InvokeKey(rootWidget_, 0, TB_KEY_F10, mod, keydown);
        break;
    case KEY_F11:
        InvokeKey(rootWidget_, 0, TB_KEY_F11, mod, keydown);
        break;
    case KEY_F12:
        InvokeKey(rootWidget_, 0, TB_KEY_F12, mod, keydown);
        break;
    case KEY_LEFT:
        InvokeKey(rootWidget_, 0, TB_KEY_LEFT, mod, keydown);
        break;
    case KEY_UP:
        InvokeKey(rootWidget_, 0, TB_KEY_UP, mod, keydown);
        break;
    case KEY_RIGHT:
        InvokeKey(rootWidget_, 0, TB_KEY_RIGHT, mod, keydown);
        break;
    case KEY_DOWN:
        InvokeKey(rootWidget_, 0, TB_KEY_DOWN, mod, keydown);
        break;
    case KEY_PAGEUP:
        InvokeKey(rootWidget_, 0, TB_KEY_PAGE_UP, mod, keydown);
        break;
    case KEY_PAGEDOWN:
        InvokeKey(rootWidget_, 0, TB_KEY_PAGE_DOWN, mod, keydown);
        break;
    case KEY_HOME:
        InvokeKey(rootWidget_, 0, TB_KEY_HOME, mod, keydown);
        break;
    case KEY_END:
        InvokeKey(rootWidget_, 0, TB_KEY_END, mod, keydown);
        break;
    case KEY_INSERT:
        InvokeKey(rootWidget_, 0, TB_KEY_INSERT, mod, keydown);
        break;
    case KEY_TAB:
        InvokeKey(rootWidget_, 0, TB_KEY_TAB, mod, keydown);
        break;
    case KEY_DELETE:
        InvokeKey(rootWidget_, 0, TB_KEY_DELETE, mod, keydown);
        break;
    case KEY_BACKSPACE:
        InvokeKey(rootWidget_, 0, TB_KEY_BACKSPACE, mod, keydown);
        break;
    case KEY_ESC:
        InvokeKey(rootWidget_, 0, TB_KEY_ESC, mod, keydown);
        break;
    default:
        if (mod & TB_SUPER)
        {
            InvokeKey(rootWidget_, keycode, TB_KEY_UNDEFINED, mod, keydown);
        }

    }

}

void TBUI::HandleKeyDown(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || keyboardDisabled_)
        return;

    using namespace KeyDown;

    int keycode = eventData[P_KEY].GetInt();
    int scancode = eventData[P_SCANCODE].GetInt();

    HandleKey(true, keycode, scancode);

}

void TBUI::HandleKeyUp(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || keyboardDisabled_)
        return;

    using namespace KeyUp;

    int keycode = eventData[P_KEY].GetInt();
    int scancode = eventData[P_SCANCODE].GetInt();

    HandleKey(false, keycode, scancode);

}

void TBUI::HandleTextInput(StringHash eventType, VariantMap& eventData)
{
    if (inputDisabled_ || keyboardDisabled_)
        return;

    using namespace TextInput;

    const String& text = eventData[P_TEXT].GetString();

    for (unsigned i = 0; i < text.Length(); i++)
    {
        InvokeKey(rootWidget_, text[i], TB_KEY_UNDEFINED, TB_MODIFIER_NONE, true);
        InvokeKey(rootWidget_, text[i], TB_KEY_UNDEFINED, TB_MODIFIER_NONE, false);
    }

}

void TBUI::HandleUpdate(StringHash eventType, VariantMap& eventData)
{

    TBMessageHandler::ProcessMessages();

    // Timestep parameter is same no matter what event is being listened to
    float timeStep = eventData[Update::P_TIMESTEP].GetFloat();

    if (fadeTarget_ != fadeAlpha_)
    {
        currentFadeTime_ += timeStep;

        if (currentFadeTime_ >= fadeTime_)
        {
            fadeAlpha_ = fadeTarget_;
        }
        else
        {
            if (fadeAlpha_ > fadeTarget_)
            {
                fadeAlpha_ =  1.0f  - (currentFadeTime_/fadeTime_);
            }
            else
                fadeAlpha_ =  (currentFadeTime_/fadeTime_ * (fadeTarget_));
        }
    }
}


void TBUI::FadeOut(float time)
{
    fadeTarget_ = 0.0f;
    currentFadeTime_ = 0.0f;
    fadeTime_ = time;
}

void TBUI::FadeIn(float time)
{
    fadeTarget_ = 1.0f;
    currentFadeTime_ = 0.0f;
    fadeTime_ = time;
}

bool TBUI::LoadResourceFile(TBWidget* widget, const String& filename)
{

    tb::TBNode node;

    // TODO: use Urho resources
    if (!node.ReadFile(filename.CString()))
        return false;

    tb::g_widgets_reader->LoadNodeTree(widget, &node);
    return true;
}

void TBUI::Render(VertexBuffer* buffer, const PODVector<UIBatch>& batches, unsigned batchStart, unsigned batchEnd)
{

    if (batches.Empty())
        return;

    Vector2 invScreenSize(1.0f / (float)graphics_->GetWidth(), 1.0f / (float)graphics_->GetHeight());
    Vector2 scale(2.0f * invScreenSize.x_, -2.0f * invScreenSize.y_);
    Vector2 offset(-1.0f, 1.0f);

    Matrix4 projection(Matrix4::IDENTITY);
    projection.m00_ = scale.x_;
    projection.m03_ = offset.x_;
    projection.m11_ = scale.y_;
    projection.m13_ = offset.y_;
    projection.m22_ = 1.0f;
    projection.m23_ = 0.0f;
    projection.m33_ = 1.0f;

    graphics_->ClearParameterSources();
    graphics_->SetColorWrite(true);
    graphics_->SetCullMode(CULL_NONE);
    graphics_->SetDepthTest(CMP_ALWAYS);
    graphics_->SetDepthWrite(false);
    graphics_->SetDrawAntialiased(false);
    graphics_->SetFillMode(FILL_SOLID);
    graphics_->SetStencilTest(false);

    graphics_->ResetRenderTargets();

    graphics_->SetVertexBuffer(buffer);

    ShaderVariation* noTextureVS = graphics_->GetShader(VS, "Basic", "VERTEXCOLOR");
    ShaderVariation* diffTextureVS = graphics_->GetShader(VS, "Basic", "DIFFMAP VERTEXCOLOR");
    ShaderVariation* noTexturePS = graphics_->GetShader(PS, "Basic", "VERTEXCOLOR");
    ShaderVariation* diffTexturePS = graphics_->GetShader(PS, "Basic", "DIFFMAP VERTEXCOLOR");
    ShaderVariation* diffMaskTexturePS = graphics_->GetShader(PS, "Basic", "DIFFMAP ALPHAMASK VERTEXCOLOR");
    ShaderVariation* alphaTexturePS = graphics_->GetShader(PS, "Basic", "ALPHAMAP VERTEXCOLOR");

    unsigned alphaFormat = Graphics::GetAlphaFormat();

    for (unsigned i = batchStart; i < batchEnd; ++i)
    {
        const UIBatch& batch = batches[i];
        if (batch.vertexStart_ == batch.vertexEnd_)
            continue;

        ShaderVariation* ps;
        ShaderVariation* vs;

        if (!batch.texture_)
        {
            ps = noTexturePS;
            vs = noTextureVS;
        }
        else
        {
            // If texture contains only an alpha channel, use alpha shader (for fonts)
            vs = diffTextureVS;

            if (batch.texture_->GetFormat() == alphaFormat)
                ps = alphaTexturePS;
            else if (batch.blendMode_ != BLEND_ALPHA && batch.blendMode_ != BLEND_ADDALPHA && batch.blendMode_ != BLEND_PREMULALPHA)
                ps = diffMaskTexturePS;
            else
                ps = diffTexturePS;
        }

        graphics_->SetShaders(vs, ps);
        if (graphics_->NeedParameterUpdate(SP_OBJECTTRANSFORM, this))
            graphics_->SetShaderParameter(VSP_MODEL, Matrix3x4::IDENTITY);
        if (graphics_->NeedParameterUpdate(SP_CAMERA, this))
            graphics_->SetShaderParameter(VSP_VIEWPROJ, projection);
        if (graphics_->NeedParameterUpdate(SP_MATERIAL, this))
            graphics_->SetShaderParameter(PSP_MATDIFFCOLOR, Color(1.0f, 1.0f, 1.0f, 1.0f));

        graphics_->SetBlendMode(batch.blendMode_);
        graphics_->SetScissorTest(true, batch.scissor_);
        graphics_->SetTexture(0, batch.texture_);
        graphics_->Draw(TRIANGLE_LIST, batch.vertexStart_ / UI_VERTEX_SIZE, (batch.vertexEnd_ - batch.vertexStart_) /
            UI_VERTEX_SIZE);
    }
}

void TBUI::SetVertexData(VertexBuffer* dest, const PODVector<float>& vertexData)
{
    if (vertexData.Empty())
        return;

    // Update quad geometry into the vertex buffer
    // Resize the vertex buffer first if too small or much too large
    unsigned numVertices = vertexData.Size() / UI_VERTEX_SIZE;
    if (dest->GetVertexCount() < numVertices || dest->GetVertexCount() > numVertices * 2)
        dest->SetSize(numVertices, MASK_POSITION | MASK_COLOR | MASK_TEXCOORD1, true);

    dest->SetData(&vertexData[0]);
}


void TBUI::Render()
{
    SetVertexData(vertexBuffer_, vertexData_);
    Render(vertexBuffer_, batches_, 0, batches_.Size());
}

void TBUI::HandleRenderUpdate(StringHash eventType, VariantMap& eventData)
{
    PROFILE(GetTBUIBatches);

    // Get rendering batches from the non-modal UI elements
    batches_.Clear();
    vertexData_.Clear();

    const IntVector2& rootSize = GetSize();
    IntRect currentScissor = IntRect(0, 0, rootSize.x_, rootSize.y_);
    GetBatches(batches_, vertexData_, currentScissor);

}

void TBUI::TBFileReader(const char* filename, void** data, unsigned* length)
{
    *data = 0;
    *length = 0;

    ResourceCache* cache = readerContext_->GetSubsystem<ResourceCache>();
    SharedPtr<File> file = cache->GetFile(filename);
    if (!file || !file->IsOpen())
        return;

    unsigned size = file->GetSize();

    if (!size)
        return;

    void* _data = malloc(size);
    if (!_data)
        return;

    if (file->Read(_data, size) != size)
    {
        free(_data);
        return;
    }

    *length = size;
    *data = _data;

}



}

#endif