In the simplified Circle user control, you will only copy the Fill and the size of the of the user control. In order to allow the user control to be copied, you add a copy constructor method in the code-behind file.
#Drag and drop circles code#
In Visual Basic, add the following code to create both a parameterless constructor and a copy constructor. In C#, add the following code after the parameterless constructor to create a copy constructor. This file will contain the user interface elements of the user control.Īdd the following markup to the root Grid to create a simple user control that has a blue circle as its UI. In the Add New Item dialog box, change the name to Circle.xaml, and click Add.Ĭircle.xaml and its code-behind is added to the project. On the Project menu, select Add User Control. In this section, you will add a new user control to the project. This markup creates the user interface for the test application. For more information, see Walkthrough: My first WPF desktop application.Īdd the following markup between the opening and closing Grid tags. In this section, you will create the application infrastructure, which includes a main page with two panels and a TextBox.Ĭreate a new WPF Application project in Visual Basic or Visual C# named DragDropExample. You need Visual Studio to complete this walkthrough. This walkthrough illustrates the following tasks:Įnable the user control to be a drag source.Įnable the user control to be a drop target.Įnable a panel to receive data dropped from the user control. You will write code that enables the panels to process dropped Circle data, which will enable you to move or copy Circles from the Children collection of one panel to the other. You will also create a small application that contains two panel controls and a TextBox to test the drag-and-drop functionality. If you drag from a Circle control to a TextBox, the string representation of the Fill color is copied to the TextBox.
For example, if you drag from one Circle control to another, the Fill color data is copied from the source Circle to the target. You will implement functionality on the control to enable data transfer through drag-and-drop. In this walkthrough, you will create a custom WPF UserControl that represents a circle shape.
#Drag and drop circles how to#
This walkthrough demonstrates how to create a custom user control that can participate in drag-and-drop data transfer in Windows Presentation Foundation (WPF).
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