#### Repository: 
https://github.com/markusfisch/ShaderEditor


Suggested on the [project repository](https://github.com/markusfisch/ShaderEditor/issues/92).

#### Components
 
My suggestion will require two buttons to be added at the top of the Editor's interface.

#### Proposal

 There are some basic, or necessary features an app needs to have. Although, it doesn't mean every app out there must have every basic feature, but at least have the basic ones that are related, or needed to give better, or good user experience. 

A few days ago, I had a lot of fun using ShaderEdittor. While using the app as an editor for my shaders code, there are some options I  found missing, as these options are;

* Ability to undo
* Ability to redo the undone.

#### Effect of not having those features

Currently, while typing in the editor, and the user mistakenly deletes a line of their vital codes, the action can't be undone because there is no such key to undo the action. It'd be nice to have these two options implemented. 
The two opinions should act similar to the undo, and redo we see on other apps. Here's a brief definition;
* **Undo**: Erases the last change done to the codes. reverting it to an older state.

* **Redo:** The opposite of undo is to redo. The redo command reverses the undo action.

### One more request

 Currently, the top of Editor's interface looks occupied as you can see from the image below.
![Screenshot_20190414-050622.png](https://cdn.steemitimages.com/DQmXFyQgFBnAxRgTpbGf4bnykSqVx6nu3xyF3vMyAvo7BGc/Screenshot_20190414-050622.png)

So, I was wondering if the available icons can be made smaller? So as to have space for Redo, and Undo option. But, if making the icons smaller isn't possible, then I suggest the removal of the **Tab button**.

I understand that the tab button helps the user to modify their codes for easy readability. But, I believe that the space bar on the user's keypad can also be used to create tabs. So, the Redo an undo option is more Important than the Tab option.

#### Mockups / Examples

The first image below shows the Tab button, and how occupied the options are. The second screenshot shows the replacement of the tab button with the suggested options.

![hey1.png](https://cdn.steemitimages.com/DQmavpNguvsp2k8anZhTmMo6MU6bbEyaAPYFGWLRZCJSwhm/hey1.png)

# How can this be done?

I have taken the time to find the sample code. And, I am glad to provide this awesome code by **zeleven**.

```

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button redoBtn = (Button) findViewById(R.id.redo);
        Button undoBtn = (Button) findViewById(R.id.undo);
        EditText editText = (EditText) findViewById(R.id.edittext);
      
        // pass edittext object to TextViewUndoRedo class
        TextViewUndoRedo helper = new TextViewUndoRedo(edittext);
        
        // call the method from TextViewUndoRedo class
        redoBtn.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
            helper.redo(); // perform redo
          }
        });
        undoBtn.setOnClickLisener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
            helper.undo(); // perform undo
          }
        });
    }
}


```
The complete codes can be found [Here.](https://gist.github.com/zeleven/0cfa738c1e8b65b23ff7df1fc30c9f7e)


# Benefits of Undo & Redo button

I would love to generally state the overview importance of Redo and undo button over the Tab option.

* If the Tab option isn't available, users will be able to create tabs will space keypad.
* If the Redo, and undo option is missing, users who might have mistakenly cleared their codes would have to start typing all over again.


#### GitHub Account

[Realrufans](https://github.com/realrufans)