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Create a custom <Page> class derived from the WPF control in C#?


By : weart
Date : October 15 2020, 08:10 AM
this will help I had been using System.Windows.Controls.Page class in my WPF application before I felt the need to create my own class "CustomPage", derived from "System.Windows.Controls.Page", , You should to tell compiler to use your class explicitly.
code :
 <local:MyPage x:Class="DerivedPage.MyPage"
               xmlns:local="clr-namespace:AppName.DerivedPage"
               ...


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WPF style problem with custom control and textbox-derived class


By : Isiah Paul
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You can set the BasedOn property of the custom TextBox style to the base style. Should automatically derive from whichever base style it inherits, in this case your application-level style.
code :
<Style x:Key="CustomControlStyle" TargetType="{x:Type local:CustomControl}" BasedOn="{x:Type TextBox}">

How to create custom composite control derived from the FrameworkElement


By : user2250731
Date : March 29 2020, 07:55 AM
this will help I guess it could make sense to inherit from FrameworkElement if you wish to create some sort of "Image-only" panel. It looks from your code example that the list of images would be fixed? Then you could write code in MeasureOverride and ArrangeOverride to lay them out. But as AnthonyWJones said, more details on what you're trying to accomplish would help determine the best way to go.

Using a Derived class of a Java Swing control to create listener for self


By : user3334061
Date : March 29 2020, 07:55 AM
this will help At the outset: I know that what I am doing is bad design. I am trying this to get a better feel of Java - what is possible, what is not and why? , You can skip passing the container and just do
code :
@Override
public void actionPerformed(ActionEvent event)
{
    this.getParent().setBackground(buttonColor);
}

How to resolve conflicts between Derived Custom Control Class and EventHandlers in Form1.cs


By : user2961788
Date : March 29 2020, 07:55 AM
it helps some times , A couple of things:
code :
public class CustomListView : ListView
{
    public CustomListView()
    {
        cms.Items.AddRange(new ToolStripItem[]{ new ToolStripLabel("Test1"),new ToolStripLabel("Test2")});
        ContextMenuStrip = cms;
    }
    private bool ContextAllowed = false;
    private ContextMenuStrip cms = new ContextMenuStrip();

    public override ContextMenuStrip ContextMenuStrip
    {
        get
        {
            return base.ContextMenuStrip;
        }
        set
        {
            base.ContextMenuStrip = value;
            base.ContextMenuStrip.Opening += ContextMenuStrip_Open;
        }
    }

    protected override void OnMouseDown(MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Right)
        {
            ListViewHitTestInfo test = HitTest(e.X, e.Y); //perform a hit test
            if (test.Item != null) //if it hits an item, display the popup bar
            {
                ContextAllowed = true;
                ContextMenuStrip.Show();
            }
        }
        base.OnMouseDown(e);
    }
    protected override void OnMouseUp(MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Right)
        {
            ContextAllowed = false; //close the menu
        }
        base.OnMouseUp(e);
    }

    private void ContextMenuStrip_Open(object sender, CancelEventArgs e)
    {
        if (!ContextAllowed)
        {
            e.Cancel = true;
        }
    }
}

How to create custom User Control derived from CommonDialog class


By : Omer
Date : March 29 2020, 07:55 AM
I wish this helpful for you You are seriously on the wrong track with this. These dialogs are Components, not controls. They are very thin wrappers around the dialogs that are built into Windows. Those dialogs themselves don't know anything about .NET and are written in unmanaged code. The only reason they are a Component and not just a plain class is to allow you to drop one on a form. Helpful to set a few properties with the designer.
Maybe the term "CommonDialog" was misleading. Microsoft called it "common" only because they are commonly used dialogs in a GUI program. And encouraged using the built-in ones so that every program has a very similar way to, say, open a file.
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