SelectableLabel or TextArea in Scrollview

Question

While using a Textarea with a Scrollview works great in Unity 3.5, it does not work well in Unity 3.4. I am developing a script that requires a scrollable label that is selectable. A standard label works well with the scrollview, but a selectable label or text area will not expand the scrollview controls. Any ideas on how this can be achieved in Unity 3.4?

Answer 1

Best Answer

Answer by absameen · May 20, 2012 at 11:44 PM

Was finally able to figure this one out. Create a GUIStyle called textStyle and use textStyle.CalcSize to size the TextArea based on the content inside of it. This will allow you to scroll it with a scroll view:

 scrollView = EditorGUILayout.BeginScrollView(scrollView, false, false);
 Vector2 textSize = textStyle.CalcSize(new GUIContent(myString));
 EditorGUILayout.TextArea(codeCache, textStyle, GUILayout.ExpandHeight(true), GUILayout.ExpandWidth(true), GUILayout.MinWidth(textSize.x), GUILayout.MinHeight(textSize.y));
 EditorGUILayout.EndScrollView();

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Answer 2

Thanks @absameen for putting me on the right track. In my case I wanted to deal with word wrap as well, so I needed to use CalcHeight, not CalcSize. This requires knowing the width of the current draw area, which required jumping through a couple of extra hoops.

Here is the final result, a helper method for drawing multi-line selectable text inside a scroll area:

     private Vector3 ScrollableSelectableLabel(Vector3 position, string text, GUIStyle style)
     {
         // Extract scroll position and width from position vector.
         Vector2 scrollPos = new Vector2(position.x, position.y);
         float width = position.z;

         scrollPos = GUILayout.BeginScrollView(scrollPos);

         // Calculate height of text.
         float pixelHeight = style.CalcHeight(new GUIContent(text), width);
         EditorGUILayout.SelectableLabel(text, Styles.info, GUILayout.MinHeight(pixelHeight));

         // Update the width on repaint, based on width of the SelectableLabel's rectangle.
         if (Event.current.type == EventType.Repaint)
         {
             width = GUILayoutUtility.GetLastRect().width;
         }

         GUILayout.EndScrollView();

         // Put scroll position and width back into the Vector3 used to track position.
         return new Vector3(scrollPos.x, scrollPos.y, width);
     }

SelectableLabel or TextArea in Scrollview

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