How to implement clipboard paste with Ctrl-V or button?

[Andrew de los Reyes]

Hi Folks,

I have a NaCl/Chrome V2 app. I would like to implement copy and paste. I think copy will be doable in JavaScript (haven't tried yet), but I'm having trouble just getting paste to work. I know I need to handle this in JavaScript, but part of the problem is that I have NaCl set up to handle all keystrokes. So, when the user hits Ctrl-V, I get that in NaCl. Even if I return 'false' in the C++ event handler, the JavaScript onpaste doesn't seem to be called.

Are there any examples of a NaCl app that handles all keystrokes being able to handle paste?

Also, would it be possible to have a DOM/JS paste button (here I'm thinking about Chromebook touchscreen support where a keyboard may not be present or preferred)?

Thanks,

-andrew

[Andrew de los Reyes]

sbc@ told me to ping this thread. Does anyone have ideas?

I'm in building 1950, so if it's easier I can chat in person.

[Ben Smith]

Comments inline.

On Wednesday, July 16, 2014 8:20:57 AM UTC-7, Andrew de los Reyes wrote:

sbc@ told me to ping this thread. Does anyone have ideas?

I'm in building 1950, so if it's easier I can chat in person.

On Wednesday, July 9, 2014 10:39:16 AM UTC-7, Andrew de los Reyes wrote:

Hi Folks,

I have a NaCl/Chrome V2 app. I would like to implement copy and paste. I think copy will be doable in JavaScript (haven't tried yet), but I'm having trouble just getting paste to work. I know I need to handle this in JavaScript, but part of the problem is that I have NaCl set up to handle all keystrokes. So, when the user hits Ctrl-V, I get that in NaCl. Even if I return 'false' in the C++ event handler, the JavaScript onpaste doesn't seem to be called.

This is strange, as I ran the same test as you (on the input_event example in the SDK) and the onpaste event did fire. Here is my diff:

--- example.js

+++ example.js

@@ -5,6 +5,9 @@

 // Called by the common.js module.

 function moduleDidLoad() {

   common.naclModule.style.backgroundColor = 'gray';

+  document.body.onpaste = function(e) {

+    common.logMessage('onpaste called!');

+  };

 }

 

 // Called by the common.js module.

 --- input_event.cc

+++ input_event.cc

@@ -235,7 +235,7 @@

       } break;

     }

 

-    return true;

+    return false;

   }

 };

 

I'm ran this on Chrome 38.0.2081.0 on Linux, maybe it is broken on other OSes/older versions?

Are there any examples of a NaCl app that handles all keystrokes being able to handle paste?

Also, would it be possible to have a DOM/JS paste button (here I'm thinking about Chromebook touchscreen support where a keyboard may not be present or preferred)?

I believe you can do this with document.execCommand('paste'). See https://developer.chrome.com/extensions/declare_permissions#clipboardRead

 

Thanks,

-andrew

[Andrew de los Reyes]

Thanks. I'm able to reproduce your work on the demo and get the same results, but for some reason it doesn't work in my app when I seem to do the same thing. I wonder if it's because I'm using pnacl?

It's moot, though, because I think I can use the document.execCommand('paste') command to read the clipboard. So I can just run that when I detect Ctrl-V.

Thanks!

-andrew

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