如何获取键盘光标的位置作为文本框中的点

Question

i want to get Keyboard cursor position in textbox or RichtextBox. On WinFrom i did this by using this code

Point p = rtb.GetPositionFromCharIndex(rtb.SelectionStart);

p.Y += (int)rtb.Font.GetHeight()*2;               
lstboxIntelli.Location = p;
lstboxbIntelli.Show();
ActiveControl = lstboxIntelli;

But in WPF i cant get GetPositionFromCharIndex property is there any other way to achieved this

I want to position a Listbox right under the keyboard cursor (Like Intellisense)

Any help will be appreciate

Answer 1

In WPF TextBox you can get caret position in multiple ways:

1. By accessing TextBox.SelectionStart and TextBox.SelectionLength properties.
2. TextBox.CaretIndex property.

Unfortunately there is no GetPositionFromCharIndex in TextBox so you'll have to do a little trick using GetRectFromCharacterIndex to get starting point for intellisense:

var rect = rtb.GetRectFromCharacterIndex(rtb.CaretIndex);
var point = rect.BottomRight;

Note: We are using BottomRight to make put intellisense in proper place.