Switch usercontrols in mainform within a usercontrol click event - winform

Question

5.00/5 (1 vote)

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This may sound stupid, But I am having hard time to figure this out; any help would be appreciated:

I have two user controls called “Safety_Check” and “OEE_Track”. In my MainForm I have a panel called “pnl_main_controller” this is where I am displaying both my user controls. I have two buttons on my main form and I am dynamically switching between both without any issue.

Safety_Check User control;

C#

public partial class Safety_Check : UserControl
    {
        private static Safety_Check _instance;

        public static Safety_Check instance
        {
            get
            {
                if (_instance == null)
                    _instance = new Safety_Check();
                return _instance;
            }
        }

        public Safety_Check()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ///////------------------------
        }

    }

OEE_Track User control

public partial class OEE_Track : UserControl
    {

        private static OEE_Track _instance;

        public static OEE_Track instance
        {
            get
            {
                if (_instance == null)
                    _instance = new OEE_Track();
                return _instance;
            }
        }

        public OEE_Track()
        {
            InitializeComponent();
        }
    }

MainForm:

public partial class MainForm : Form
    {
     private void btn_reg_Click(object sender, EventArgs e)
        {
            if (!pnl_main_controller.Contains(Safety_Check.instance))
            {
                pnl_main_controller.Controls.Add(Safety_Check.instance);
                Safety_Check.instance.Dock = DockStyle.Fill;
                Safety_Check.instance.BringToFront();
            }
            else
            {
                Safety_Check.instance.BringToFront();
            }        }

       private void btn_OEE_Click(object sender, EventArgs e)
        {
            if (!pnl_main_controller.Contains(OEE_Track.instance))
            {
                pnl_main_controller.Controls.Add(OEE_Track.instance);
                OEE_Track.instance.Dock = DockStyle.Fill;
                OEE_Track.instance.BringToFront();
            }
            else
            {
                OEE_Track.instance.BringToFront();
            }
     }

What I am trying to do is I have a button called “Button1” on my “Safety_Check” Usercontrol, whenever I press this , I want “Safety_Check” to be disappear on “pnl_main_controller” and bring “OEE_Track” to the panel

What I have tried:

C#

if (!main.pnl_main_controller.Contains(Safety_Check.instance))
            {
                Safety_Check.instance.Hide();
                main.pnl_main_controller.Controls.Add(OEE_Track.instance);
                OEE_Track.instance.Dock = DockStyle.Fill;
                OEE_Track.instance.BringToFront();
            }
            else
            {
                OEE_Track.instance.BringToFront();
            }

Posted 8-Mar-19 4:15am

Dinuka Kuruppu

Updated 8-Mar-19 6:14am

v3

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Comments

BillWoodruff 9-Mar-19 9:13am

Have you considered the simple solution of using a TabControl ?

2 solutions

Solution 1

Don't do it like that.
That's a poor solution, because it's against OOPs principles: the "child" controls have to not only be aware of their "parent" (which compromises design) but also of the existence (and type) of each other - which makes it impossible to reuse, and also means you can't make any changes without considering the effect of other code in other classes.
That's a lot of bad design ideas going on here!

Instead, use Events which are handled in the "parent form" to control what is going on.
See here: Transferring information between two forms, Part 3: Child to Child[^] - it's about forms (but user controls work in exactly the same way, forms are controls, after all) and communications but the same principles and mechanisms apply.

Posted 8-Mar-19 4:26am

OriginalGriff

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#realJSOP · Accepted Answer · 2019-03-08T04:30:00

This is how I might do it in your event handler in WPF (of course, you didn't tell us what framework you're working with, so I'm just guessing at a solution):

C#

// toggle the first item
Safety_Check.Visibility = (Safety_Check.Visibility == Visibility.Collapsed) ? Visibility.Visible 
                                                                            : Visibility.Collapsed;
// and then toggle the second item, based on the first item's visibility
OEE_Track.Visibility    = (Safety_Check.Visibility == Visibility.Collapsed) ? Visibility.Visible 
                                                                            : Visibility.Collapsed;