以两种Windows形式显示控件

Question

I have inherited a control from Panel-Class. I have added some events to this control. I gave move - ability to this control and so on ..

I have two display screens. I have a main program where the inherited panel is displaying an image on a small area. I want to show this panel fullscreen on a second.

I created a new form and use the same control... But i can not move both screens together. What should I do ?

Answer 1

If you want to be able to manipulate both forms at the same time, show the second form with Show() instead of ShowDialog(). You can certainly pass the original panel to the second form and add it to the form's Controls collection. I am not sure if this is the best way to do it (sharing one control across two forms), but I don't know your requirements either.

Answer 2

I wouldn't use a second form, but a second 'mode' (fullscreen vs. not) on your existing form. You can have 2 panel controls, or just one and resize.

Answer 3

I think this kind of behaviour calls for a model-view pattern. If that's implemented, the rest should fall into place.

Answer 4

The problem is that you only have one instance of your inherited panel. You actually have to make another "copy" of it, a new instance, before you can add it to the other form.

Mypanel mypanel1 = new Mypanel();
Mypanel mypanel1copy = new Mypanel();

You can either edit these instances to contain the same data all the time through the run, or use something like "Deep Copy":

How do you do a deep copy of an object in .NET (C# specifically)?

Keep in mind, that any changes to mypanel1 should be done to mypanel1copy , too.