FlowLayout.cs :  » Game » RealmForge » LayoutManager » C# / CSharp Open Source

using System;
using ControlSystem.Windows.Forms.Control;
using RectangleSystem.Drawing.Rectangle;
using PointSystem.Drawing.Point;
using ArrayListSystem.Collections.ArrayList;
using ICollectionSystem.Collections.ICollection;

namespace LayoutManager{
  public class FlowLayout : ILayoutManager {
    private int hPad, vPad; // horizontal and vertical padding values
    private Control con;
    private bool tabOrder;
    private ControlTabComparer comp = new ControlTabComparer();
    private ArrayList sortedControls;


    private class ControlTabComparer : System.Collections.IComparer {
      public int Compare(Control x, Control y) {        
        if (x == null && y == null) { return 0; }
        else if (x == null) { return -1; }
        else if (y == null) { return  1; }
        else { return x.TabIndex - y.TabIndex; }
      }
    
      public int Compare(object x, object y) {      
        return Compare((Control) x, (Control) y);
      }
    }

    public FlowLayout(int horizontalPadding, int verticalPadding, bool tabOrder) {
      hPad = horizontalPadding;
      vPad = verticalPadding;
      this.tabOrder = tabOrder;
      sortedControls = new ArrayList();
    }

    public FlowLayout(int horizontalPadding, int verticalPadding) : 
    this(horizontalPadding, verticalPadding, false) { }
    
    public FlowLayout() : this(0, 0, false) { }

    // true ... controls will be sorted by TabIndex
    // false .. controls will be sorted by insertion order
    public bool TabOrder {
      get {
        return tabOrder;
      }
      set {
        if (value != tabOrder) {
          tabOrder = value;
          DoLayout();
        }
      }
    }
    
    #region ILayoutMgr Members

    public Control Control {
      get {
        return con;
      }
      set {
        if (value != null && value != con) {
          con = value;
        }
      }
    }

    public void DoLayout() {
      int curTopLine, curLeftLine, curBottomLine;
      
      if (Control != null && Control.Controls.Count > 0) {
        curBottomLine = 0;
        curTopLine  = curBottomLine + vPad;
        curLeftLine = hPad;
        
        ICollection col = (TabOrder)?(ICollection)sortedControls:(ICollection)con.Controls;

        foreach (Control c in col) {
          if (curLeftLine + c.Size.Width > con.Width) {
            curTopLine  = curBottomLine + vPad;
            curLeftLine = hPad;
          }
          c.Location = new Point(curLeftLine, curTopLine);
          curLeftLine = curLeftLine + c.Size.Width + hPad;
          if (curBottomLine < (curTopLine + c.Size.Height)) {
            curBottomLine = (curTopLine + c.Size.Height);
          }
        }
      }
    }
    
    public void ControlAdded(Control c) {
      sortedControls.Add(c);
      sortedControls.Sort(comp);
    }

    public void ControlRemoved(Control c) {
      sortedControls.Remove(c);
    }

    #endregion
  }
}