2010 Septembrie - 10 ani

Improve appearance/behavior of Properties for a Custom Control at design time using attributes

Improve appearance/behavior of Properties for a Custom Control at design time using attributes

• Description
• Category
• set the cathegory under which the property appears
• DefaultValue
• AmbientValue (true|false)
• indicates that the value for a property is derived from parent control
• Browsable (true|false)
• if false, the property should not be shown in the Properties window
• DesignOnly (true|false) 
• if true, the property is only available at design time
• ImmutableObject
• Shows if subproperties of this object are displayed as read-only (e.g.: Point with X,Y properties)
• Localizable 
• Shows if the design time va;lue for thios property is stored in a resource file instead of in the generated code
• MergableProperty
• Configures how the properties window behaves when more than one instance of this control is selected at once
• NotifyParentProperty (true|false)
• Notify the parent property about changes of property(for example Size property should be inform when Height or Width has been changed)
• ParenthesisPropertyName
• name of the property is displayed in parenthesis
• ReadOnly
• RefreshProperty 
• you could specify if the rest of property should be updated when this property is changed
• Attributes to be applied at the class level
• DefaultEvent
• When the control is double-clicked in designed an event is automatically added to the code
• DefaultyProperty
• Default property highlighted in Properties win

References:

Matthew MacDonald, User Interfaces in C#—Windows Forms and Custom Controls, Chapter 8: Design-Time Support for Custom
Controls

How to change the Shape of your appli...

How to change the Shape of your application?

• Create a Form
• Add namespace System.Drawing.Drawing2D
• Assign a new shape to its Region Property

You can do this on Load event:

        private void Form1_Load(object sender, EventArgs e)

        {

            GraphicsPath _graphicsPath = new GraphicsPath();

            _graphicsPath.AddArc(0, 0, Width, Height, 20, -270);

            Region = new Region(_graphicsPath);

        }

This is the result: