Variable cannot be changed

Question

I cant change text value

namespace MauiApp7  
{  
    public class GraphicsDrawable : IDrawable  
    {  
        public string text;  
        public void Draw(ICanvas canvas, RectF dirtyRect)  
        {  
            canvas.DrawString(text, 60, 60, HorizontalAlignment.Center);  
        }  
    }  
}  

---------------------------------------------------

namespace MauiApp7;  
  
public partial class MainPage : ContentPage  
{  
    public MainPage()  
    {  
        InitializeComponent();  
    }  
  
    private void Button_Clicked(object sender, EventArgs e)  
    {   
        GraphicsDrawable drawable = new GraphicsDrawable();  
        drawable.text = entry1.Text;  
        graphicsView.Invalidate();  
    }  
}  

Answer 1

Hello,​

If want to change the text of GraphicsDrawable depending on entry1.Text.

you need to set drawable of graphicsView when you create a new GraphicsDrawable object like following code.

   var draw = new GraphicsDrawable();  
   graphicsView.Drawable = draw;  

Best Regards,

Leon Lu

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Answer 2

Change it from a field to a property and use proper casing

public string Text { get; set; }  

Answer 3

I am looking at your code in this function.

  private void Button_Clicked(object sender, EventArgs e)  
  {  
      var draw = new GraphicsDrawable  
      {  
          Text = entText.Text  

       };  

       Debug.WriteLine("MainPage: " + draw.Text);  

       GraphicsDrawable drawable = new GraphicsDrawable();  
       graphicsView.Invalidate();  
  }  

The variable draw is only in scope in the function Button_Clicked. Once Button_Clicked function finishes running draw is gone.