Patch Camera Using Volume Buttons to Take a Picture
Note: If you are only looking for a hardware-based button to take a picture, the space bar will do that for you already.
Preamble
You will need write permissions to the filesystem on your Pre to apply this patch.
To get write persmissions execute:
rootfs_open -w
To remount the filesystem as read-only:
mount -o remount,ro /
Procedure
The patch is performed on /usr/palm/applications/com.palm.app.camera/app/controllers/capture-assistant.js. Please back up this file before proceeding.
--- sftp://Palm Pre/apps/com.palm.app.camera/app/controllers/capture-assistant.js.webosinternals.orig +++ sftp://Palm Pre/apps/com.palm.app.camera/app/controllers/capture-assistant.js @@ -134,6 +134,7 @@ this._handleCaptureToggle(); }.bind(this)); } + this.volumeKeySubscription = undefined; @@ -164,6 +165,15 @@ AppAssistant.photoRollVideoLoader = AppAssistant.libraries["metascene.videos"]; } + // listen to volume key events + this.volumeKeySubscription = new Mojo.Service.Request( + 'palm://com.palm.keys/audio', + { + method: 'status', + parameters: {'subscribe': true}, + onFailure: function() { Mojo.Log.error("Could not subscribe to volume key events"); }, + onSuccess: this.handleVolumeKeys.bind(this), + }); llog("CaptureAssistant::setup() finished"); }catch(e){llog("setup threw: "+Object.toJSON(e));}}, @@ -332,6 +342,11 @@ } this.cameraControl.closeCamera(); + + // clean up listener for volume keys + if(this.volumeKeySubscription) { + this.volumeKeySubscription.cancel(); + } }, handleCommand: function(event){ @@ -383,6 +398,13 @@ } }, + // capture on release of volume keys + handleVolumeKeys: function(payload) { + // capture when either volume up or down buttons are released + if(payload.state === 'up' && (payload.key === 'volume_up' || payload.key === 'volume_down')) { + this.cameraControl.stillCapture(); + } + }, /** * Called by Mojo when the orientation of the device changes.
Notes
Volume Control
The keys will still alter the volume of the device. There is a way to lock the buttons so that they don't modify volume when pressed but still report events. Needs futher investigation.
~FXDemolisher