Click here to Skip to main content
12,444,517 members (51,786 online)
Click here to Skip to main content

Stats

453.6K views
16.4K downloads
540 bookmarked
Posted

WPF Diagram Designer - Part 3

, 29 Feb 2008 CPOL
Connecting items
using System;
using System.Linq;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;

namespace DiagramDesigner.Controls
{
    public class DragThumb : Thumb
    {
        public DragThumb()
        {
            base.DragDelta += new DragDeltaEventHandler(DragThumb_DragDelta);
        }

        void DragThumb_DragDelta(object sender, DragDeltaEventArgs e)
        {
            DesignerItem designerItem = this.DataContext as DesignerItem;
            DesignerCanvas designer = VisualTreeHelper.GetParent(designerItem) as DesignerCanvas;
            if (designerItem != null && designer != null && designerItem.IsSelected)
            {
                double minLeft = double.MaxValue;
                double minTop = double.MaxValue;

                // we only move DesignerItems
                var designerItems = from item in designer.SelectedItems
                                    where item is DesignerItem
                                    select item;

                foreach (DesignerItem item in designerItems)
                {
                    double left = Canvas.GetLeft(item);
                    double top = Canvas.GetTop(item);

                    minLeft = double.IsNaN(left) ? 0 : Math.Min(left, minLeft);
                    minTop = double.IsNaN(top) ? 0 : Math.Min(top, minTop);
                }

                double deltaHorizontal = Math.Max(-minLeft, e.HorizontalChange);
                double deltaVertical = Math.Max(-minTop, e.VerticalChange);

                foreach (DesignerItem item in designerItems)
                {
                    double left = Canvas.GetLeft(item);
                    double top = Canvas.GetTop(item);

                    if (double.IsNaN(left)) left = 0;
                    if (double.IsNaN(top)) top = 0;

                    Canvas.SetLeft(item, left + deltaHorizontal);
                    Canvas.SetTop(item, top + deltaVertical);
                }

                designer.InvalidateMeasure();
                e.Handled = true;
            }
        }
    }
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

sukram
Austria Austria
No Biography provided

You may also be interested in...

| Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.160811.3 | Last Updated 29 Feb 2008
Article Copyright 2008 by sukram
Everything else Copyright © CodeProject, 1999-2016
Layout: fixed | fluid