Reset properties when a dockpane closes [edited: or close an Add-In]

[GyanendraGurung]

I am trying to figure out:

a. How to reset the properties in the dockpane when it closes [edited: or close an Add-In]. The following code below with "SaveDirectory" is initialized when I open the dockpane for the first time, then even after closing it and opening several different projects, the value of "SaveDirectory" does not change. How do I do that?

b. I thought of resetting the value inside "UninitializeAsync()" method, but I guess "UninitializeAsync()" method is not used for that. 

Thanks. 

Kenny

namespace Test
{
    internal class TestDockPaneViewModel : DockPane
    {
        private string _saveDirectory;
        /// <summary>
        /// Default Directory to save all user input data.
        /// </summary>		
        public string SaveDirectory
        {
            get { return _saveDirectory; }
            set { _saveDirectory = value; NotifyPropertyChanged(() => SaveDirectory); }
        }        
        /// <summary>
        /// Constructor
        /// </summary>
        protected TestDockPaneViewModel() 
        {
            SaveDirectory = System.IO.Directory.GetCurrentDirectory();
        }
        /// <summary>
        /// Called when the pane is uninitialized.
        /// </summary>
        protected async override Task UninitializeAsync()
        {
		    // Reset Default Save Directory when dockpane closes // 
            SaveDirectory = null;
            await base.UninitializeAsync();
        }	
		 
}

[KirkKuykendall1]

Did you try overriding OnHidden?

[GyanendraGurung]

Thanks for the suggestion. I shall look into the OnHidden() method as well. The problem was currently solved by overriding the OnShow() method. I think I will try out the OnHidden() method as well. 

[KirkKuykendall1]

I just noticed where you say "even after closing it and opening several different projects"

I'm not sure if OnHidden gets called when you simply open a different project.  If not, you might also need to subscribe to ArcGIS.Desktop.Core.Events.ProjectOpenedEvent in your PaneViewModel and reset when that event fires too.

[GKmieliauskas · Accepted solution]

Hi,

What do you mean by "Dockpane closing"? By pressing x at the right upper corner you just hide dockpane.

So if it's right place for your reset code, so you can override OnShow Dockpane class method:

protected override void OnShow(bool isVisible)
{
if (!isVisible)
{
SaveDirectory = null;
}
}

UninitializeAsync will be called on ArcGIS Pro closing.

[GyanendraGurung]

1. By "Dockpane closing", I meant to close the Dockpane of the Add-In. 

2. Overriding the OnShow() method, as you have shown, solved the problem.

[KarthikAditya]

The OnShow method is called not only when the DockPane is opened or closed but also when it's auto hidden - collapsed into the non-client area.

Is there a way to distinguish when the DockPane is closed (by clicking X at top right corner) and when its auto-hidden?

[GKmieliauskas]

Hi,

Code behind of Dockpane is based on UserControl so you can’t listen OnClosing event or something similar.

I have attached modified ArcGIS Pro SDK community sample (ContentFileExplorer). This is not brilliant solution which needs many different techniques in code behind and mvvm.

But it works (I think)

[KarthikAditya]

Hi, thank you for your sample. It works and can distinguish when dock pane is closed and when its auto-hidden. 

But, it fails when the 'Auto-hide' (pin symbol) button is clicked. i.e. When the pane is opened, and auto-hide button is clicked, the message box shows 'x'. But it shouldn't?

[GKmieliauskas]

Hi,

I don't use that code and didn't check all cases;. I only wanted to show you the way how to do your task.

Try to save previous state of dockpane and check if it changes. then do not react.