autoheightspacer.c

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// -----------------------------------------------------------
class AutoHeightSpacer : ScriptedWidgetEventHandler
{
    reference bool AlignChilds;
    reference int MinHeight;
    reference int MaxHeight;
    reference int Gap;
    reference float Top;
    protected Widget m_root;
 
    void Update()
    {
        float x = 0;
        float y = 0;
        float width = 0;
        float height = 0;
        float heightOld = 0;
        float top = Top;
        float rowRight;
        float rowHeight;
        float rowWidth;
        Widget child = m_root.GetChildren();
 
        //PrintString(m_root.GetName() + ": AutoHeightSpacer::Update()");
 
        if ( !AlignChilds ) top = -100000;
 
        if (child != NULL)
        {
        // first row init
        m_root.GetScreenSize(rowWidth, height);
        rowHeight = 0;
        rowRight = rowWidth;
 
        while (child)
        {
            if (child.IsVisible() == false || child.GetName() == "SelectedContainer" || child.GetName() == "Icon")
            {
                // skip invisible widgets
                child = child.GetSibling();
                continue;
            }
 
            child.GetScreenSize(width, height);
 
            if (AlignChilds)
            {
                child.SetFlags(WidgetFlags.EXACTPOS, false);
 
                // no space left in this row, move to next one
                if (rowRight < width)
                {
                    top += rowHeight;
                    if ( rowHeight > 0 ) top += Gap;
                    rowRight = rowWidth;
                    rowHeight = 0;
                }
 
                // increase row height if necessary
                if (height > rowHeight) rowHeight = height;
 
                child.SetPos(rowWidth - rowRight, top, false);
                rowRight -= width + Gap;
            }
            else
            {
                child.GetScreenPos(x, y);
                y += height;
                if (top < y) top = y;
            }
 
            child = child.GetSibling();
        }
 
        // add last row height;
        top += rowHeight;
 
        if (AlignChilds)
        {
            height = top;
        }
        else
        {
            m_root.GetScreenPos(x, y);
            height = top - y;
        }
        }
 
        m_root.GetSize(width, heightOld);
 
        if (MaxHeight > 0 && height > MaxHeight)
        {
            height = MaxHeight;
        }
 
        if (MinHeight > height)
        {
            height = MinHeight;
        }
 
        if (Math.AbsInt(heightOld - height) > 1)
        {
            m_root.SetSize(width, height);
        }
        else if (AlignChilds)
        {
            m_root.Update();
        }
 
        return;
    }
 
    void OnWidgetScriptInit(Widget w)
    {
        m_root = w;
        m_root.SetHandler(this);
        m_root.SetFlags(WidgetFlags.VEXACTPOS);
        Update();
    }
 
    override bool OnChildRemove( Widget  w, Widget  child) {
        if (w == m_root)
        {
            Update();
        }
 
        return false;
    }
};