Key sequence capture through ProcessCmdKey

Question

I override ProcessCmdKey in my application and can get one click with modifiers (e.g. Alt + Ctrl + X). What I want to do is to imitate the processing of short cuts, for example, ReSharper, where the user holds the control key and then R, M to open the refactoring dialog

I found many shortcuts to the keyboard shortcut plus a modifier, but not much for the sequence. There is Capture multiple keywords in C # , but it uses the KeyDown event.

There are also key mining examples, such as http://www.codeproject.com/KB/system/simple_key_log.aspx , which capture everything and use their own calls.

Can I extend my ProcessCmdKey to handle key sequences, or do I need to look elsewhere? Since I have a large number of shortcuts captured in ProcessCmdKey, I would prefer not to start, if possible,

thanks

Answer 1

To achieve the required functionality, you just need to track the sequence of KeyPress events.

You can create a class to track the last key combination that was pressed in ProcessCmdKey . If this particular combination does not match the displayed command, but it is the first element of a sequence that you can save in your class. Then next time, ProcessCmdKey activated to check if the sequence has been started, check its new KeyPressTracker class. If it then checks to see if the recently pressed key combination is the second item you specify. The following is an example of pseudo code:

Step 1: ProcessCmdKey activated. The key combination is Ctrl + R , this does not correspond to the command that you want to process, but this is the first element of the sequence that you want to use ( Ctrl + R + M ).

Step 2: Save this keystroke in the new class that you created to track the last keystroke.

 KeyPressTracker.Store(KeyCode, Modifiers); 

Step 3: ProcessCmdKey activated a second time. This time, the key combination is Ctrl + M , which is not a keystroke that we are looking for, but is the second element of the sequence. We check the last saved keystroke using the new KeyPressTracker class. This will allow you to match a “sequence” such as Ctrl + R and Ctrl + M.

 var lastKeyPress = KeyPressTracker.GetLastKeyPress(); if (lastKeyPress == "Ctrl+R" && currentKeyPress == "Ctrl+M") { // Show Refactor dialog }