MyGUI_ScrollView.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_ScrollView.h"
#include "MyGUI_SkinManager.h"
#include "MyGUI_ISubWidgetText.h"
#include "MyGUI_ScrollBar.h"
 
namespace MyGUI
{
 
    const int SCROLL_VIEW_MOUSE_WHEEL = 50; // колличество пикселей для колеса мыши
    const int SCROLL_VIEW_SCROLL_PAGE = 16; // колличество пикселей для кнопок скрола
 
    ScrollView::ScrollView() :
        mContentAlign(Align::Center)
    {
        mChangeContentByResize = false;
    }
 
    void ScrollView::initialiseOverride()
    {
        Base::initialiseOverride();
 
        // FIXME нам нужен фокус клавы
        setNeedKeyFocus(true);
 
        assignWidget(mScrollViewClient, "Client");
        if (getClientWidget() != nullptr)
        {
            getClientWidget()->eventMouseWheel += newDelegate(this, &ScrollView::notifyMouseWheel);
        }
 
        // create widget that will be real parent for child widgets
        Widget* realClient = _getClientWidget()->createWidget<Widget>("Default", IntCoord(), Align::Default);
        realClient->eventMouseWheel += newDelegate(this, &ScrollView::notifyMouseWheel);
        setWidgetClient(realClient);
 
        assignWidget(mVScroll, "VScroll");
        if (mVScroll != nullptr)
        {
            mVScroll->eventScrollChangePosition += newDelegate(this, &ScrollView::notifyScrollChangePosition);
        }
 
        assignWidget(mHScroll, "HScroll");
        if (mHScroll != nullptr)
        {
            mHScroll->eventScrollChangePosition += newDelegate(this, &ScrollView::notifyScrollChangePosition);
        }
 
        updateView();
    }
 
    void ScrollView::shutdownOverride()
    {
        mVScroll = nullptr;
        mHScroll = nullptr;
        mScrollViewClient = nullptr;
 
        Base::shutdownOverride();
    }
 
    void ScrollView::setPosition(const IntPoint& _point)
    {
        Base::setPosition(_point);
    }
 
    void ScrollView::setSize(const IntSize& _size)
    {
        Base::setSize(_size);
 
        updateView();
    }
 
    void ScrollView::setCoord(const IntCoord& _coord)
    {
        Base::setCoord(_coord);
 
        updateView();
    }
 
    void ScrollView::notifyScrollChangePosition(ScrollBar* _sender, size_t _position)
    {
        if (_sender == mVScroll)
        {
            IntPoint point = getClientWidget()->getPosition();
            point.top = -(int)_position;
            getClientWidget()->setPosition(point);
        }
        else if (_sender == mHScroll)
        {
            IntPoint point = getClientWidget()->getPosition();
            point.left = -(int)_position;
            getClientWidget()->setPosition(point);
        }
    }
 
    void ScrollView::notifyMouseWheel(Widget* _sender, int _rel)
    {
        if (mVRange != 0)
        {
            IntPoint point = getClientWidget()->getPosition();
            int offset = -point.top;
            if (_rel < 0)
                offset += SCROLL_VIEW_MOUSE_WHEEL;
            else
                offset -= SCROLL_VIEW_MOUSE_WHEEL;
 
            if (offset < 0)
                offset = 0;
            else if (offset > (int)mVRange)
                offset = mVRange;
 
            if (offset != point.top)
            {
                point.top = -offset;
                if (mVScroll != nullptr)
                {
                    mVScroll->setScrollPosition(offset);
                }
                getClientWidget()->setPosition(point);
            }
        }
        else if (mHRange != 0)
        {
            IntPoint point = getClientWidget()->getPosition();
            int offset = -point.left;
            if (_rel < 0)
                offset += SCROLL_VIEW_MOUSE_WHEEL;
            else
                offset -= SCROLL_VIEW_MOUSE_WHEEL;
 
            if (offset < 0)
                offset = 0;
            else if (offset > (int)mHRange)
                offset = mHRange;
 
            if (offset != point.left)
            {
                point.left = -offset;
                if (mHScroll != nullptr)
                {
                    mHScroll->setScrollPosition(offset);
                }
                getClientWidget()->setPosition(point);
            }
        }
    }
 
    IntSize ScrollView::getContentSize() const
    {
        return getClientWidget()->getSize();
    }
 
    IntPoint ScrollView::getContentPosition() const
    {
        return IntPoint() - getClientWidget()->getPosition();
    }
 
    void ScrollView::setContentPosition(const IntPoint& _point)
    {
        getClientWidget()->setPosition(IntPoint() - _point);
    }
 
    IntSize ScrollView::getViewSize() const
    {
        return mScrollViewClient == nullptr ? getSize() : mScrollViewClient->getSize();
    }
 
    size_t ScrollView::getVScrollPage() const
    {
        return SCROLL_VIEW_SCROLL_PAGE;
    }
 
    size_t ScrollView::getHScrollPage() const
    {
        return SCROLL_VIEW_SCROLL_PAGE;
    }
 
    void ScrollView::updateView()
    {
        updateScrollSize();
        updateScrollPosition();
    }
 
    void ScrollView::setVisibleVScroll(bool _value)
    {
        mVisibleVScroll = _value;
        updateView();
    }
 
    void ScrollView::setVisibleHScroll(bool _value)
    {
        mVisibleHScroll = _value;
        updateView();
    }
 
    void ScrollView::setCanvasAlign(Align _value)
    {
        mContentAlign = _value;
        updateView();
    }
 
    void ScrollView::setCanvasSize(const IntSize& _value)
    {
        getClientWidget()->setSize(_value);
        updateView();
    }
 
    IntSize ScrollView::getCanvasSize() const
    {
        return getClientWidget()->getSize();
    }
 
    void ScrollView::setPropertyOverride(std::string_view _key, std::string_view _value)
    {
        if (_key == "VisibleVScroll")
            setVisibleVScroll(utility::parseValue<bool>(_value));
 
        else if (_key == "VisibleHScroll")
            setVisibleHScroll(utility::parseValue<bool>(_value));
 
        else if (_key == "CanvasAlign")
            setCanvasAlign(utility::parseValue<Align>(_value));
 
        else if (_key == "CanvasSize")
            setCanvasSize(utility::parseValue<IntSize>(_value));
 
        else
        {
            Base::setPropertyOverride(_key, _value);
            return;
        }
 
        eventChangeProperty(this, _key, _value);
    }
 
    bool ScrollView::isVisibleVScroll() const
    {
        return mVisibleVScroll;
    }
 
    bool ScrollView::isVisibleHScroll() const
    {
        return mVisibleHScroll;
    }
 
    Align ScrollView::getCanvasAlign() const
    {
        return mContentAlign;
    }
 
    void ScrollView::setCanvasSize(int _width, int _height)
    {
        setCanvasSize(IntSize(_width, _height));
    }
 
    Align ScrollView::getContentAlign() const
    {
        return mContentAlign;
    }
 
    void ScrollView::setViewOffset(const IntPoint& _value)
    {
        IntPoint value = _value;
        IntPoint currentOffset = getClientWidget()->getPosition();
 
        if (mHRange != 0)
        {
            if (value.left > 0)
                value.left = 0;
            else if (value.left < -(int)mHRange)
                value.left = -(int)mHRange;
        }
        else
        {
            value.left = currentOffset.left;
        }
 
        if (mVRange != 0)
        {
            if (value.top > 0)
                value.top = 0;
            else if (value.top < -(int)mVRange)
                value.top = -(int)mVRange;
        }
        else
        {
            value.top = currentOffset.top;
        }
 
        if (mHScroll != nullptr)
            mHScroll->setScrollPosition(-value.left);
 
        if (mVScroll != nullptr)
            mVScroll->setScrollPosition(-value.top);
 
        getClientWidget()->setPosition(value);
    }
 
    IntPoint ScrollView::getViewOffset() const
    {
        return getClientWidget()->getPosition();
    }
 
    IntCoord ScrollView::getViewCoord() const
    {
        return mScrollViewClient == nullptr ? getCoord() : mScrollViewClient->getCoord();
    }
 
    ScrollBar* ScrollView::getVScroll() const
    {
        return mVScroll;
    }
 
} // namespace MyGUI