MyGUI_ControllerEdgeHide.cpp

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */

#include "MyGUI_Precompiled.h"
#include "MyGUI_ControllerEdgeHide.h"
#include "MyGUI_Gui.h"
#include "MyGUI_InputManager.h"
#include "MyGUI_WidgetManager.h"
#include "MyGUI_Widget.h"

namespace MyGUI
{

#ifndef M_PI
    const float M_PI = 3.141593f;
#endif

    ControllerEdgeHide::ControllerEdgeHide() :
        mTime(1.0),
        mRemainPixels(0),
        mShadowSize(0),
        mElapsedTime(0)
    {
    }

    ControllerEdgeHide::~ControllerEdgeHide()
    {
    }

    void ControllerEdgeHide::prepareItem(Widget* _widget)
    {
        recalculateTime(_widget);
        // вызываем пользовательский делегат для подготовки
        eventPreAction(_widget, this);
    }

    bool ControllerEdgeHide::addTime(Widget* _widget, float _time)
    {
        const IntSize& view_size = _widget->getParentSize();
        // do nothing if we have minimized window
        if (view_size.width <= 1 && view_size.height <= 1)
            return true;

        Widget* keyFocus = InputManager::getInstance().getKeyFocusWidget();
        Widget* mouseFocus = InputManager::getInstance().getMouseFocusWidget();

        while ((keyFocus != nullptr) && (_widget != keyFocus))
            keyFocus = keyFocus->getParent();
        while ((mouseFocus != nullptr) && (_widget != mouseFocus))
            mouseFocus = mouseFocus->getParent();

        // if our widget or its children have focus
        bool haveFocus = ((keyFocus != nullptr) || (mouseFocus != nullptr)) || (_widget->getVisible() == false);

        mElapsedTime += haveFocus ? -_time : _time;

        if (mElapsedTime >= mTime)
        {
            mElapsedTime = mTime;
        }
        if (mElapsedTime <= 0)
        {
            mElapsedTime = 0.0f;
            return true;
        }

        float k = sin(M_PI * mElapsedTime / mTime - M_PI / 2);
        if (k < 0) k = (-pow(-k, 0.7f) + 1) / 2;
        else k = (pow(k, 0.7f) + 1) / 2;

        MyGUI::IntCoord coord = _widget->getCoord();
        // if widget was moved
        if (coord != mLastCoord)
        {
            // if still moving - leave it alone
            if (haveFocus)
                return true;
            else
                recalculateTime(_widget);
        }

        bool nearBorder = false;

        if ((coord.left <= 0) && !(coord.right() >= view_size.width - 1))
        {
            coord.left = - int( float(coord.width - mRemainPixels - mShadowSize) * k);
            nearBorder = true;
        }
        if ((coord.top <= 0) && !(coord.bottom() >= view_size.height - 1))
        {
            coord.top = - int( float(coord.height - mRemainPixels - mShadowSize) * k);
            nearBorder = true;
        }
        if ((coord.right() >= view_size.width - 1) && !(coord.left <= 0))
        {
            coord.left = int(float(view_size.width - 1) - float(mRemainPixels) * k - float(coord.width) * (1.f - k));
            nearBorder = true;
        }
        if ((coord.bottom() >= view_size.height - 1) && !(coord.top <= 0))
        {
            coord.top = int(float(view_size.height - 1) - float(mRemainPixels) * k - float(coord.height) * (1.f - k));
            nearBorder = true;
        }

        if (nearBorder)
        {
            _widget->setCoord(coord);
        }
        else
        {
            mElapsedTime = 0;
        }
        mLastCoord = coord;

        eventUpdateAction(_widget, this);

        return true;
    }

    void ControllerEdgeHide::setProperty(const std::string& _key, const std::string& _value)
    {
        if (_key == "Time")
            setTime(utility::parseValue<float>(_value));
        else if (_key == "RemainPixels")
            setRemainPixels(utility::parseValue<int>(_value));
        else if (_key == "ShadowSize")
            setShadowSize(utility::parseValue<int>(_value));
    }

    void ControllerEdgeHide::recalculateTime(Widget* _widget)
    {
        float k = 0;
        const MyGUI::IntCoord& coord = _widget->getCoord();
        const MyGUI::IntSize& view_size = _widget->getParentSize();

        // check if widget is near any border and not near opposite borders at same time
        if ((coord.left <= 0) && !(coord.right() >= view_size.width - 1))
        {
            k = - (float) coord.left / (coord.width - mRemainPixels - mShadowSize);
        }
        else if ((coord.top <= 0) && !(coord.bottom() >= view_size.height - 1))
        {
            k = - (float)coord.top / (coord.height - mRemainPixels - mShadowSize);
        }
        else if ((coord.right() >= view_size.width - 1) && !(coord.left <= 0))
        {
            k = (float)(coord.right() - view_size.width + 1 ) / (coord.width - mRemainPixels);
        }
        else if ((coord.bottom() >= view_size.height - 1) && !(coord.top <= 0))
        {
            k = (float)(coord.bottom() - view_size.height + 1 ) / (coord.height - mRemainPixels);
        }

        //mElapsedTime = (asin(k)/M_PI + 1./2) * mTime;
        // this is reversed formula from ControllerEdgeHide::addTime k calculation
        if (k > 0.5f)
            mElapsedTime = (asin( pow( 2 * k - 1, 1 / 0.7f)) / M_PI + 1.f / 2) * mTime;
        else
            mElapsedTime = (asin(-pow(-2 * k + 1, 1 / 0.7f)) / M_PI + 1.f / 2) * mTime;
    }

    void ControllerEdgeHide::setTime(float _value)
    {
        mTime = _value;
    }

    void ControllerEdgeHide::setRemainPixels(int _value)
    {
        mRemainPixels = _value;
    }

    void ControllerEdgeHide::setShadowSize(int _value)
    {
        mShadowSize = _value;
    }

} // namespace MyGUI