GUI Button Tricks

/* String Content example */

function OnGUI () {
 GUI.Label (Rect (0,0,100,50), "This is the text string for a Label Control");
}

To display an image, declare a Texture2D public variable, and pass the variable name as the content argument like this:

/* Texture2D Content example */

var controlTexture : Texture2D;

function OnGUI () {
 GUI.Label (Rect (0,0,100,50), controlTexture);
}

Here is an example closer to a real-world scenario:

/* Button Content examples */

var icon : Texture2D;

function OnGUI () {
 if (GUI.Button (Rect (10,10, 100, 50), icon)) {
  print ("you clicked the icon");
 }

 if (GUI.Button (Rect (10,70, 100, 20), "This is text")) {
  print ("you clicked the text button");
 }
}

There is a third option which allows you to display images and text together in a GUI Control. You can provide a GUIContent object as the Content argument, and define the string and image to be displayed within the GUIContent.

/* Using GUIContent to display an image and a string */

var icon : Texture2D;

function OnGUI () {
 GUI.Box (Rect (10,10,100,50), GUIContent("This is text", icon));
}

You can also define a Tooltip in the GUIContent, and display it elsewhere in the GUI when the mouse hovers over it.

/* Using GUIContent to display a tooltip */

function OnGUI () {
 // This line feeds "This is the tooltip" into GUI.tooltip
 GUI.Button (Rect (10,10,100,20), GUIContent ("Click me", "This is the tooltip"));
 // This line reads and displays the contents of GUI.tooltip
 GUI.Label (Rect (10,40,100,20), GUI.tooltip);
}

If you're daring you can also use GUIContent to display a string, an icon, and a tooltip!

/* Using GUIContent to display an image, a string, and a tooltip */

var icon : Texture2D;

function OnGUI () {
 GUI.Button (Rect (10,10,100,20), GUIContent ("Click me", icon, "This is the tooltip"));
 GUI.Label (Rect (10,40,100,20), GUI.tooltip);
}