An odd GUI Slider getting stuck thing.

I found something odd in the GUI Interface.

I just tryed to have the value of a slider in a GUILayout change the Text inside a GUI Box that is above the slider. But when I try it, the slider will stop moving as soon as the Box text gets updated. It acts as if I let go of the mouse button. Here is my code:

Code (csharp):

1. var sliderValue = 0;
2.  
3. function OnGUI () {
4.     GUILayout.BeginArea (Rect (10,10,200,200));
5.     GUILayout.BeginVertical();
6.     GUILayout.Box("Volume: " + sliderValue);
7.     sliderValue = GUILayout.HorizontalSlider(sliderValue, 0, 100);
8.     GUILayout.EndVertical();
9.     GUILayout.EndArea();
10. }

Now if I change the code so I'm using a Label instead of a box, then it works.

Code (csharp):

1. var sliderValue = 0;
2.  
3. function OnGUI () {
4.     GUILayout.BeginArea (Rect (10,10,200,200));
5.     GUILayout.BeginVertical();
6.     GUILayout.Label("Volume: " + sliderValue);
7.     sliderValue = GUILayout.HorizontalSlider(sliderValue, 0, 100);
8.     GUILayout.EndVertical();
9.     GUILayout.EndArea();
10. }
11.  

It also works if the Box is after the slider in the layout:

Code (csharp):

1.     sliderValue = GUILayout.HorizontalSlider(sliderValue, 0, 100);
2.     GUILayout.Box("Volume: " + sliderValue);
3.  

Is it not designed to work this way with Boxes?... I guess I could just use a Label or a TextArea since they work fine. Just thought I should ask after I found it.

-Vince

 

I've tested your code, and tried the same thing in C# too. It does seem to be a bug. I think Nicholas may have to figure this one out.

 

Did you file a bug on this one?

 

I had to laugh. It is now 2016 and Unity 5.3 and this is still an issue.

When I implement a slider after a textfield, the slider gets locked in place. I can randomly click on the bar until the value changes and then continue into sliding, but stopping will lock it again.

Code (CSharp):

1. GUI.TextField (new Rect (740, 80, 40, 40), current.ToString("F1"));
2. GUI.TextField (new Rect (540, 80, 180, 40), "Slider paremeter");
3. current = GUI.HorizontalSlider (new Rect (540, 140, 240, 40), current, 1.0f, 10.0f);

I found a workaround would be to place the slider code above the textfield and then use the rectangle parameters to place the textfield back above the slider.

Code (CSharp):

1. current = GUI.HorizontalSlider (new Rect (540, 140, 240, 40), current, 1.0f, 10.0f);
2. GUI.TextField (new Rect (740, 80, 40, 40), current.ToString("F1"));
3. GUI.TextField (new Rect (540, 80, 180, 40), "Slider parameter");