using System;
using System.Collections;
using System.Text;

namespace DevComponents.DotNetBar
{
    internal class RibbonTabItemContainer : GenericItemContainer
    {
        protected override void OnStyleChanged()
        {
            eDotNetBarStyle effectiveStyle = this.EffectiveStyle;
            if (effectiveStyle == eDotNetBarStyle.Windows7)
            {
                this.PaddingLeft = 0;
                this.PaddingRight = 0;
                this.PaddingTop = 0;
            }
            else if (effectiveStyle == eDotNetBarStyle.Office2010 || StyleManager.IsMetro(effectiveStyle))
            {
                this.PaddingLeft = 0;
                this.PaddingRight = 1;
                this.PaddingTop = 1;
            }
            else
            {
                this.PaddingLeft = 1;
                this.PaddingRight = 1;
                this.PaddingTop = 1;
            }
            base.OnStyleChanged();
        }
        protected override bool OnBeforeLayout()
        {
            if (this.Orientation != eOrientation.Horizontal)
                return true;

            ArrayList ribbonTabItems = new ArrayList();
            int totalWidth = 0;
            int totalRibbonTabItemsWidth = 0;
            int minimumSize = 24;
            int availableWidth = this.WidthInternal - (this.PaddingLeft + this.PaddingRight);

            foreach (BaseItem item in this.SubItems)
            {
                if (!item.Visible)
                    continue;
                item.RecalcSize();
                totalWidth += (item.WidthInternal + this.ItemSpacing);
                if (item is RibbonTabItem)
                {
                    // Reset reduced size flag
                    ((RibbonTabItem)item).ReducedSize = false;
                    ribbonTabItems.Add(item);
                    totalRibbonTabItemsWidth += (item.WidthInternal + this.ItemSpacing);
                }
            }

            int totalReduction = totalWidth - availableWidth;

            if (totalWidth > availableWidth && totalRibbonTabItemsWidth > 0)
            {
                if (totalReduction >= totalRibbonTabItemsWidth - (minimumSize * ribbonTabItems.Count + ribbonTabItems.Count - 1))
                {
                    foreach (RibbonTabItem item in ribbonTabItems)
                    {
                        item.WidthInternal = minimumSize;
                        item.ReducedSize = true;
                    }
                }
                else
                {
                    float reduction = 1 - (float)totalReduction / (float)totalRibbonTabItemsWidth;
                    bool reducedSize = false;
                    if (reduction <= .75)
                        reducedSize = true;
                    for (int i = 0; i < ribbonTabItems.Count; i++)
                    {
                        RibbonTabItem item = ribbonTabItems[i] as RibbonTabItem;
                        item.ReducedSize = reducedSize;
                        if (i == ribbonTabItems.Count - 1)
                        {
                            item.WidthInternal -= totalReduction;
                        }
                        else
                        {
                            int width = (int)(item.WidthInternal * reduction);
                            if (width < minimumSize)
                                width = minimumSize;
                            totalReduction -= (item.WidthInternal - width);
                            item.WidthInternal = width;
                        }
                    }
                }
            }

            return false;
        }

        protected override bool ShouldCollapseParentItem()
        {
            BaseItem expandedItem = ExpandedItem();
            if (expandedItem is ApplicationButton)
            {
                RibbonStrip strip = this.ContainerControl as RibbonStrip;
                if (strip != null)
                {
                    BaseItem item = strip.HitTest(MouseDownPt);
                    if (item is SystemCaptionItem)
                        return false;
                }
            }
            return true;
        }
    }
}