How to access current code editor from tool window?

Question

I am currently trying to create an extension for this using “Visual Studio 2015”. I want to create a function that inserts the source code that fits into the cursor part of the current code editor when the button of ToolWindow is clicked. There was a ToolWindow sample in the SDK template. However, it was completed in ToolWindow, and no way to access the code editor was written. How can I get / set the current code editor source code from ToolWindow?

Answer 1

As Sergey suggests, we can use the TextSelection.Text property.

But somehow I failed to get the Selection in this way for VS2015:DTE.ActiveDocument.Selection.

For me, In VS2015 I created a new custom Tool Window item, added a simple TextBox control in the ToolWindow, and then double-click the default Click me! button to navigate to button-Click method in ToolWindow1Control.xaml.cs file, after that I add code like below to get text from textbox and insert it into editor:

        [SuppressMessage("Microsoft.Globalization", "CA1300:SpecifyMessageBoxOptions", Justification = "Sample code")]
        [SuppressMessage("StyleCop.CSharp.NamingRules", "SA1300:ElementMustBeginWithUpperCaseLetter", Justification = "Default event handler naming pattern")]
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            string text = textBox.Text;
            DTE dte = Package.GetGlobalService(typeof(DTE)) as DTE;
            (dte.ActiveDocument.Selection as EnvDTE.TextSelection).Text = text;
        }

So for me, I actually use code below to insert the text:

        DTE dte = Package.GetGlobalService(typeof(DTE)) as DTE;
        (dte.ActiveDocument.Selection as EnvDTE.TextSelection).Text = "Add your text here."; 

In addition:

To use the code above, you need to add definitions in ToolWindow1Control.xaml.cs file:

        using Microsoft.VisualStudio.Shell;
        using EnvDTE;

Hope it makes some help :)