Handling copy paste from Button click

GoXam
1

Hi,

I have a diagram and some nodes in the palette. I drag few nodes on to the diagram. I select them and I press Ctrl+C and Ctrl+V the selected nodes got pasted on to the diagram which is perfect.

Now, I want to achieve the same scenarios using button click. i.e. I drag and drop the nodes from palette on to the diagram and I click on copy button and it should copy to the clipboard and when I click on the paste button it should paste to the selected instance of diagram. I have used ClipboardPasted and SelectionCopied events to bind ( via Commands) but seems to be not working.

Also I tried to use the default commands from WPF i.e. Copy Paste Undo Redo etc for menuitem instance. this also worked perfectly. But I would have to do some custom operations before Copy paste events. Hence we have to hook button commands to the diagram events.

Suggestion awaited.

2

I’m not clear about what you want to do, but you could try overriding methods of CommandHandler:
http://goxam.com/2.2/helpWPF/webframe.html#Northwoods.GoWPF~Northwoods.GoXam.CommandHandler~Copy.html
http://goxam.com/2.2/helpWPF/webframe.html#Northwoods.GoWPF~Northwoods.GoXam.CommandHandler~Paste.html

Or if you wanted to change or extend how the selection is saved, override:
http://goxam.com/2.2/helpWPF/webframe.html#Northwoods.GoWPF~Northwoods.GoXam.CommandHandler~CopyToClipboard.html
http://goxam.com/2.2/helpWPF/webframe.html#Northwoods.GoWPF~Northwoods.GoXam.CommandHandler~PasteFromClipboard.html

3

Thanks for the references Walter. How Can I bind these Commands to my button ?

4

There are routed Commands that are static properties of the Commands class:
http://www.goxam.com/2.2/helpWPF/webframe.html#Northwoods.GoWPF~Northwoods.GoXam.Commands~Copy.html
http://www.goxam.com/2.2/helpWPF/webframe.html#Northwoods.GoWPF~Northwoods.GoXam.Commands~Paste.html

Actually, those two are exactly the same object as ApplicationCommands.Copy and ApplicationCommands.Paste, as are some of the other “standard” commands. All commands eventually get handled by the CommandHandler.

5

Okay. I was earlier using the same Commands i.e. ApplicationCommand.Copy etc but found that these commands work only with MenuItem control and not any other control. Hence I have to find a way to do Copy - Paste - Undo - Redo and such events from button click. How can we do that using GoXam commands/events.

I have to manually call the corresponding goxam event when my copy button is clicked. but not sure how do I pass the parameters to that event.

I am using MVVM in my project.

6

Are you asking for something like this:

<Button Command="Paste" CommandTarget="{Binding ElementName=myDiagram}">Paste</Button>