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WPF Diagram Designer - Part 2

, 8 Oct 2008 CPOL
Designer Canvas with Zoombox
DiagramDesignerPart2.zip
DiagramDesigner
Adorners
bin
Debug
DiagramDesigner.exe
DiagramDesigner.csproj.user
Images
attention.png
chart1.png
chart2.png
chart3.png
cross.png
mail.png
new.png
newBold.png
nuclear.png
plus.png
ring.png
rotateLeft.png
rotateRight.png
rt1.png
rt2.png
rt3.png
rt4.png
rt5.png
rt6.png
software.png
walk.png
world.png
Properties
Settings.settings
Resources
Stencils
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;

namespace DiagramDesigner
{
    public class ResizeDecorator : Control
    {
        private Adorner adorner;

        public bool ShowDecorator
        {
            get { return (bool)GetValue(ShowDecoratorProperty); }
            set { SetValue(ShowDecoratorProperty, value); }
        }

        public static readonly DependencyProperty ShowDecoratorProperty =
            DependencyProperty.Register("ShowDecorator", typeof(bool), typeof(ResizeDecorator),
            new FrameworkPropertyMetadata(false, new PropertyChangedCallback(ShowDecoratorProperty_Changed)));

        public ResizeDecorator()
        {
            Unloaded += new RoutedEventHandler(this.ResizeDecorator_Unloaded);
        }

        private void HideAdorner()
        {
            if (this.adorner != null)
            {
                this.adorner.Visibility = Visibility.Hidden;
            }
        }

        private void ShowAdorner()
        {
            if (this.adorner == null)
            {
                AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);

                if (adornerLayer != null)
                {
                    ContentControl designerItem = this.DataContext as ContentControl;
                    Canvas canvas = VisualTreeHelper.GetParent(designerItem) as Canvas;
                    this.adorner = new ResizeAdorner(designerItem);
                    adornerLayer.Add(this.adorner);

                    if (this.ShowDecorator)
                    {
                        this.adorner.Visibility = Visibility.Visible;
                    }
                    else
                    {
                        this.adorner.Visibility = Visibility.Hidden;
                    }
                }
            }
            else
            {
                this.adorner.Visibility = Visibility.Visible;
            }
        }

        private void ResizeDecorator_Unloaded(object sender, RoutedEventArgs e)
        {
            if (this.adorner != null)
            {
                AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
                if (adornerLayer != null)
                {
                    adornerLayer.Remove(this.adorner);
                }

                this.adorner = null;
            }
        }

        private static void ShowDecoratorProperty_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ResizeDecorator decorator = (ResizeDecorator)d;
            bool showDecorator = (bool)e.NewValue;

            if (showDecorator)
            {
                decorator.ShowAdorner();
            }
            else
            {
                decorator.HideAdorner();
            }
        }
    }
}

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

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About the Author

sukram

Austria Austria
No Biography provided

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Web02 | 2.8.141216.1 | Last Updated 8 Oct 2008
Article Copyright 2008 by sukram
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