Unity Script Reference:

static function RepeatButton(image: Texture, params options: GUILayoutOption[]): bool;

static function RepeatButton(text: string, params options: GUILayoutOption[]): bool;

static function RepeatButton(content: GUIContent, params options: GUILayoutOption[]): bool;

static function RepeatButton(image: Texture, style: GUIStyle, params options: GUILayoutOption[]): bool;

static function RepeatButton(text: string, style: GUIStyle, params options: GUILayoutOption[]): bool;

static function RepeatButton(content: GUIContent, style: GUIStyle, params options: GUILayoutOption[]): bool;

Parameters

text	Text to display on the button.
image	Texture to display on the button.
content	Text, image and tooltip for this button.
style	The style to use. If left out, the `button` style from the current GUISkin is used.
options	An optional list of layout options that specify extra layouting properties. Any values passed in here will override settings defined by the `style`. See Also: GUILayout.Width, GUILayout.Height, GUILayout.MinWidth, GUILayout.MaxWidth, GUILayout.MinHeight, GUILayout.MaxHeight, GUILayout.ExpandWidth, GUILayout.ExpandHeight.

Returns
bool true when the holds down the mouse.

Description

Make a repeating button. The button returns true as long as the user holds down the mouse.

Repeat Buttons in the Game View.

	// Draws a button with an image and a button with text
	var tex : Texture;
	function OnGUI() {
		if(!tex) {
			Debug.LogError("No texture found, please assign a texture on the inspector");
		}
		if(GUILayout.RepeatButton (tex)) {
			Debug.Log("Clicked the image");
		}
		if(GUILayout.RepeatButton ("I am a regular Automatic Layout Button")) {
			Debug.Log("Clicked Button");
		}
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public Texture tex;
    void OnGUI() {
        if (!tex)
            Debug.LogError("No texture found, please assign a texture on the inspector");
        
        if (GUILayout.RepeatButton(tex))
            Debug.Log("Clicked the image");
        
        if (GUILayout.RepeatButton("I am a regular Automatic Layout Button"))
            Debug.Log("Clicked Button");
        
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public tex as Texture

	def OnGUI() as void:
		if not tex:
			Debug.LogError('No texture found, please assign a texture on the inspector')
		if GUILayout.RepeatButton(tex):
			Debug.Log('Clicked the image')
		if GUILayout.RepeatButton('I am a regular Automatic Layout Button'):
			Debug.Log('Clicked Button')