scrollarea.cpp

Linux系统下的《红色警戒》游戏

/*      _______   __   __   __   ______   __   __   _______   __   __                 
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 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/                      
 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naess閚 a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
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/*
 * For comments regarding functions please see the header file. 
 */

#include "guichan/exception.h"
#include "guichan/widgets/scrollarea.h"

namespace gcn
{
    ScrollArea::ScrollArea()
    {
        mVScroll = 0;
        mHScroll = 0;
        mHPolicy = SHOW_AUTO;
        mVPolicy = SHOW_AUTO;
        mScrollbarWidth = 12;
        mContent = NULL;
        mUpButtonPressed = false;
        mDownButtonPressed = false;
        mLeftButtonPressed = false;
        mRightButtonPressed = false;
        mVerticalMarkerPressed = false;
        mVerticalMarkerMousePosition = 0;
        mHorizontalMarkerPressed = false;
        mHorizontalMarkerMousePosition = 0;

        addMouseListener(this);
    }

    ScrollArea::ScrollArea(Widget *content)
    {
        mVScroll = 0;
        mHScroll = 0;
        mHPolicy = SHOW_AUTO;
        mVPolicy = SHOW_AUTO;
        mScrollbarWidth = 12;
        mContent = NULL;
        mUpButtonPressed = false;
        mDownButtonPressed = false;
        mLeftButtonPressed = false;
        mRightButtonPressed = false;
        mVerticalMarkerPressed = false;
        mVerticalMarkerMousePosition = 0;
        mHorizontalMarkerPressed = false;
        mHorizontalMarkerMousePosition = 0;

        setContent(content);
        addMouseListener(this);
    }

    ScrollArea::ScrollArea(Widget *content, unsigned int hPolicy, unsigned int vPolicy)
    {
        mVScroll = 0;
        mHScroll = 0;
        mHPolicy = hPolicy;
        mVPolicy = vPolicy;
        mScrollbarWidth = 12;
        mContent = NULL;
        mUpButtonPressed = false;
        mDownButtonPressed = false;
        mLeftButtonPressed = false;
        mRightButtonPressed = false;
        mVerticalMarkerPressed = false;
        mVerticalMarkerMousePosition = 0;
        mHorizontalMarkerPressed = false;
        mHorizontalMarkerMousePosition = 0;

        setContent(content);
        addMouseListener(this); 
    }

    ScrollArea::~ScrollArea()
    {
        setContent(NULL);        
    }
    
    void ScrollArea::setContent(Widget* widget)
    {
        if (mContent != NULL)
        {
            mContent->_setFocusHandler(NULL);
            mContent->_setParent(NULL);
        }
    
        mContent = widget;

        if (mContent != NULL)
        {
            mContent->_setFocusHandler(_getFocusHandler());
            mContent->_setParent(this);
        }

        checkPolicies();
    }
  
    Widget* ScrollArea::getContent()
    {
        return mContent;
    }

    void ScrollArea::setHorizontalScrollPolicy(unsigned int hPolicy)
    {
        mHPolicy = hPolicy;
        checkPolicies();
    }

    unsigned int ScrollArea::getHorizontalScrollPolicy()
    {
        return mHPolicy;
    }

    void ScrollArea::setVerticalScrollPolicy(unsigned int vPolicy)
    {
        mVPolicy = vPolicy;
        checkPolicies();
    }

    unsigned int ScrollArea::getVerticalScrollPolicy()
    {
        return mVPolicy;
    }

    void ScrollArea::setScrollPolicy(unsigned int hPolicy, unsigned int vPolicy)
    {
        mHPolicy = hPolicy;
        mVPolicy = vPolicy;
        checkPolicies();
    }

    void ScrollArea::setVerticalScrollAmount(int vScroll)
    {
        int max = getVerticalMaxScroll();

        mVScroll = vScroll;
    
        if (vScroll > max)
        {
            mVScroll = max;
        }
    
        if (vScroll < 0)
        {
            mVScroll = 0;
        }
    }

    int ScrollArea::getVerticalScrollAmount()
    {
        return mVScroll;
    }

    void ScrollArea::setHorizontalScrollAmount(int hScroll)
    {
        int max = getHorizontalMaxScroll();
    
        mHScroll = hScroll;
    
        if (hScroll > max)
        {
            mHScroll = max;
        }
        else if (hScroll < 0)
        {
            mHScroll = 0;
        }
    }

    int ScrollArea::getHorizontalScrollAmount()
    {
        return mHScroll;
    }

    void ScrollArea::setScrollAmount(int hScroll, int vScroll)
    {
        setHorizontalScrollAmount(hScroll);
        setVerticalScrollAmount(vScroll);
    }

    int ScrollArea::getHorizontalMaxScroll()
    {
        checkPolicies();

        if (mContent == NULL)
        {
            return 0;
        }
        
        int value = mContent->getWidth() - getContentDimension().width + 2 * mContent->getBorderSize();

        if (value < 0)
        {
            return 0;
        }

        return value;
    } 

    int ScrollArea::getVerticalMaxScroll()
    {
        checkPolicies();

        if (mContent == NULL)
        {
            return 0;
        }

        int value;
    
        value = mContent->getHeight() - getContentDimension().height + 2 * mContent->getBorderSize();
    
        if (value < 0)
        {
            return 0;
        }

        return value;
    } 

    void ScrollArea::setScrollbarWidth(int width)
    {
        if (width > 0)
        {
            mScrollbarWidth = width;
        }
        else
        {
            throw GCN_EXCEPTION("Width should be greater then 0.");
        }
    }

    int ScrollArea::getScrollbarWidth()
    {
        return mScrollbarWidth;
    }

    void ScrollArea::_setFocusHandler(FocusHandler* focusHandler)
    {
        BasicContainer::_setFocusHandler(focusHandler);

        if (mContent)
        {
            mContent->_setFocusHandler(focusHandler);
        }
    }

    void ScrollArea::_mouseInputMessage(const MouseInput &mouseInput)
    {
        BasicContainer::_mouseInputMessage(mouseInput);        
    
        if (getContentDimension().isPointInRect(mouseInput.x, mouseInput.y))
        {
            if (mContent != NULL)
            {
                if (!mContent->hasMouse())
                {
                    mContent->_mouseInMessage();          
                }
        
                MouseInput mi = mouseInput;
                
                mi.x -= mContent->getX();
                mi.y -= mContent->getY();
                                
                mContent->_mouseInputMessage(mi);
            }      
        }
        else if (mContent && mContent->hasMouse())
        {
            mContent->_mouseOutMessage();
        }
    }

    void ScrollArea::_mouseOutMessage()
    {
        if (mContent && mContent->hasMouse())
        {
            mContent->_mouseOutMessage();
        }
    
        BasicContainer::_mouseOutMessage();
    }
  
    void ScrollArea::mousePress(int x, int y, int button)
    {
        if (getUpButtonDimension().isPointInRect(x, y))
        {
            setVerticalScrollAmount(getVerticalScrollAmount() - 10);
            mUpButtonPressed = true;
        }
        else if (getDownButtonDimension().isPointInRect(x, y))
        {
            setVerticalScrollAmount(getVerticalScrollAmount() + 10);
            mDownButtonPressed = true;
        }
        else if (getLeftButtonDimension().isPointInRect(x, y))
        {
            setHorizontalScrollAmount(getHorizontalScrollAmount() - 10);
            mLeftButtonPressed = true;
        }
        else if (getRightButtonDimension().isPointInRect(x, y))
        {
            setHorizontalScrollAmount(getHorizontalScrollAmount() + 10);
            mRightButtonPressed = true;
        }        
        else if (getVerticalMarkerDimension().isPointInRect(x, y))
        {
            mVerticalMarkerPressed = true;
            mVerticalMarkerMousePosition = y - getVerticalMarkerDimension().y;
        }
        else if (getHorizontalMarkerDimension().isPointInRect(x, y))
        {
            mHorizontalMarkerPressed = true;
            mHorizontalMarkerMousePosition = x - getHorizontalMarkerDimension().x;
        } 
    }

    void ScrollArea::mouseRelease(int x, int y, int button)
    {
        mUpButtonPressed = false;
        mDownButtonPressed = false;
        mLeftButtonPressed = false;
        mRightButtonPressed = false;
        mVerticalMarkerPressed = false;
        mHorizontalMarkerPressed = false;
    }

    void ScrollArea::mouseMotion(int x, int y)
    {
        if (mVerticalMarkerPressed)
        {
            int pos = y - getVerticalBarDimension().y  - mVerticalMarkerMousePosition;
            int length = getVerticalMarkerDimension().height;

            Rectangle barDim = getVerticalBarDimension();
      
            if ((barDim.height - length) > 0)
            {
                setVerticalScrollAmount((getVerticalMaxScroll() * pos)
                                        / (barDim.height - length));
            }
            else
            {
                setVerticalScrollAmount(0);
            }     
        }
        if (mHorizontalMarkerPressed)
        {
            int pos = x - getHorizontalBarDimension().x  - mHorizontalMarkerMousePosition;
            int length = getHorizontalMarkerDimension().width;

            Rectangle barDim = getHorizontalBarDimension();
      
            if ((barDim.width - length) > 0)
            {
                setHorizontalScrollAmount((getHorizontalMaxScroll() * pos)
                                          / (barDim.width - length));
            }
            else
            {
                setHorizontalScrollAmount(0);
            }     
        }
    }

    void ScrollArea::draw(Graphics *graphics)
    {
        graphics->setColor(getBackgroundColor());
        graphics->fillRectangle(getContentDimension());
      
        int alpha = getBaseColor().a;
        Color highlightColor = getBaseColor() + 0x303030;
        highlightColor.a = alpha;    
        Color shadowColor = getBaseColor() - 0x303030;      
        shadowColor.a = alpha;
      
        if (mVBarVisible)
        {