1.0.1 - rewrite progress bar+stop button without using storage and project variable

Author: ThomasMaul

Documentation/Classes/FileTransfer_Dropbox.md

@@ -31,6 +31,7 @@ End if
 |[.executeCommand](#executecommand)<p>&nbsp;&nbsp;&nbsp;&nbsp;Allows to pass any valid Dropbox command and directly execute it.|
 |[.version](#version)<p>&nbsp;&nbsp;&nbsp;&nbsp;returns in result.data version information from Dropbox Command Line Interface Tool|
 |[.setPath](#setpath)<p>&nbsp;&nbsp;&nbsp;&nbsp;Allows to use another dbxcli installation.|
+|[.enableStopButton](#enablestopbutton)<p>&nbsp;&nbsp;&nbsp;&nbsp;Display stop button in progress dialog.|
 |[.setAsyncMode](#setasyncmode)<p>&nbsp;&nbsp;&nbsp;&nbsp;By default all commands are executed synchronously, meaning the command do not return till execution is completed or a timeout occurred. This allows all command to return the result or execution information..|
 |[.setTimeout](#settimeout)<p>&nbsp;&nbsp;&nbsp;&nbsp;sets a maximum worker execution time, stopping everything.|
 |[.stop](#stop)<p>&nbsp;&nbsp;&nbsp;&nbsp;Terminates the execution of a running operation, such as upload or download.|
@@ -239,6 +240,18 @@ sets a maximum execution time for the worker. By default all operations are stop
 The timeout is not considered when asynchronous mode is enabled.
 
 
+## enableStopButton
+
+### .enableStopButton(enable:Shared Object)
+|Parameter|Type||Description|
+|---------|--- |:---:|------|
+|enable|Object|->|Shared Object with Attribut Stop|
+
+#### Description
+Only useable if included or similar ProgressCallback method is used.
+If passed it enables the stop button in progress bar, allowing the end user to abort the operation. If Stop button is clicked, attribut of shared object enable.stop is set to true
+
+
 ## setAsyncMode
 
 ### .setAsyncMode(async:Boolean)

Documentation/Classes/FileTransfer_GDrive.md

@@ -37,6 +37,7 @@ End if
 |[.executeCommand](#executecommand)<p>&nbsp;&nbsp;&nbsp;&nbsp;Allows to pass any valid GDrive command and directly execute it.|
 |[.version](#version)<p>&nbsp;&nbsp;&nbsp;&nbsp;returns in result.data version information from Gdrive Command Line Interface Tool|
 |[.setPath](#setpath)<p>&nbsp;&nbsp;&nbsp;&nbsp;Allows to specify the installation path.|
+|[.enableStopButton](#enablestopbutton)<p>&nbsp;&nbsp;&nbsp;&nbsp;Display stop button in progress dialog.|
 |[.setAsyncMode](#setasyncmode)<p>&nbsp;&nbsp;&nbsp;&nbsp;By default all commands are executed synchronously, meaning the command do not return till execution is completed or a timeout occurred. This allows all command to return the result or execution information..|
 |[.setTimeout](#settimeout)<p>&nbsp;&nbsp;&nbsp;&nbsp;sets a maximum worker execution time, stopping everything.|
 |[.stop](#stop)<p>&nbsp;&nbsp;&nbsp;&nbsp;Terminates the execution of a running operation, such as upload or download.|
@@ -350,6 +351,18 @@ Precompiled versions for Mac and Windows can be downloaded from:
 [gdrive](https://github.com/prasmussen/gdrive/releases)
 
 
+## enableStopButton
+
+### .enableStopButton(enable:Shared Object)
+|Parameter|Type||Description|
+|---------|--- |:---:|------|
+|enable|Object|->|Shared Object with Attribut Stop|
+
+#### Description
+Only useable if included or similar ProgressCallback method is used.
+If passed it enables the stop button in progress bar, allowing the end user to abort the operation. If Stop button is clicked, attribut of shared object enable.stop is set to true
+
+
 ## setAsyncMode
 
 ### .setAsyncMode(async:Boolean)

Documentation/Classes/FileTransfer_curl.md

@@ -43,6 +43,7 @@ For more examples see the method "test_curl".
 |[.setCurlPrefix](#setcurlprefix)<p>&nbsp;&nbsp;&nbsp;&nbsp;Allows to use any additional cURL options.|
 |[.setPath](#setpath)<p>&nbsp;&nbsp;&nbsp;&nbsp;Allows to use another cURL installation.|
 |[.enableProgressData](#enableprogressdata)<p>&nbsp;&nbsp;&nbsp;&nbsp;If enabled, result.data will include progress information text.|
+|[.enableStopButton](#enablestopbutton)<p>&nbsp;&nbsp;&nbsp;&nbsp;Display stop button in progress dialog.|
 |[.setAsyncMode](#setasyncmode)<p>&nbsp;&nbsp;&nbsp;&nbsp;By default all commands are executed synchronously, meaning the command do not return till execution is completed or a timeout occurred. This allows all command to return the result or execution information..|
 |[.setTimeout](#settimeout)<p>&nbsp;&nbsp;&nbsp;&nbsp;sets a maximum worker execution time, stopping everything.|
 |[.stop](#stop)<p>&nbsp;&nbsp;&nbsp;&nbsp;Terminates the execution of a running operation, such as upload or download.|
@@ -400,6 +401,17 @@ If enabled, result.data will include progress information text, allowing to get
 Depending of total transfer time, the text will include additional lines with progress info.
 Automatically enabled if useCallback is enabled.
 
+## enableStopButton
+
+### .enableStopButton(enable:Shared Object)
+|Parameter|Type||Description|
+|---------|--- |:---:|------|
+|enable|Object|->|Shared Object with Attribut Stop|
+
+#### Description
+Only useable if included or similar ProgressCallback method is used.
+If passed it enables the stop button in progress bar, allowing the end user to abort the operation. If Stop button is clicked, attribut of shared object enable.stop is set to true
+
 ## setAsyncMode
 
 ### .setAsyncMode(async:Boolean)
@@ -470,7 +482,7 @@ The command returns after given wait time or before if execution is finished.
 |Parameter|Type||Description|
 |---------|--- |:---:|------|
 |callback|4D.Function|->|4d function to call during progress|
-|ID|Text|->|unique text to pass to callback method to identify job|
+|ID|Text|->|text to display in progress title, such as download file name|
 
 #### Description
 Allows to show a progress bar during long running operations or to get informed when command execution is complete.
@@ -481,52 +493,63 @@ The callback method is called whenever a new progress message is available from
 
 ```4D
 $ftp.useCallback(Formula(ProgressCallback); "Download 4D.dmg")
-$ftp.setAsyncMode(True)
 $result:=$ftp.download($source; $target)
-Repeat 
-	$ftp.wait(1)  // needed while our process is running
-	// wait is not needed if a form would be open or if a worker would handle the job
-	$status:=$ftp.status()
-Until (Bool($status.terminated))
+If ($checkstop.stop=True)  // user clicked stop button
+...
+End if
 ```
 
 Method ProgressCallback
 
 ```4D
-#DECLARE($ID : Text; $message : Text; $value : Integer)
+#DECLARE($ID : Text; $message : Text; $value : Integer; $sharedForProgressBar : Object)
 // called from cs.FileTransfer if callback is set via .useCallback()
 
 // $ID is set through code - $message comes from curl
+// shared object to pass progress ID back/forth and to share stop button result
 
-var ProgressBarID : Integer
+$ProgressBarID:=$sharedForProgressBar.ID
 
-If (ProgressBarID=0)
-	ProgressBarID:=Progress New
-	Progress SET MESSAGE(ProgressBarID; $ID)
+If (($ProgressBarID=0) && ($value#100))
+	$ProgressBarID:=Progress New
+	Use ($sharedForProgressBar)
+		$sharedForProgressBar.ID:=$ProgressBarID
+	End use 
+	Progress SET TITLE($ProgressBarID; $ID)
+	
+	// check if we want stop, if yes, add stop button
+	If ($sharedForProgressBar.EnableButton#Null)
+		Progress SET BUTTON ENABLED($ProgressBarID; True)
+	End if 
 End if 
 
-If ($value=100)
-	Progress QUIT(ProgressBarID)
-	ProgressBarID:=0
-Else 
-	Progress SET PROGRESS(ProgressBarID; $value/100)
+If ($ProgressBarID#0)
+	If (Progress Stopped($ProgressBarID))  // only if stop button is enabled
+		Use ($sharedForProgressBar)
+			$sharedForProgressBar.Stop:=True
+			Use ($sharedForProgressBar.EnableButton)
+				$sharedForProgressBar.EnableButton.stop:=True
+			End use 
+		End use 
+	End if 
+	
+	Case of 
+		: ($value=100)
+			Progress QUIT($ProgressBarID)
+			Use ($sharedForProgressBar)
+				$sharedForProgressBar.ID:=0
+			End use 
+		: ($value<0)
+			$message2:=Replace string($message; " "; "")  // ignore totally empty messages, happens with gdrive
+			If ($message2#"")
+				Progress SET MESSAGE($ProgressBarID; $message)
+			End if 
+		Else 
+			Progress SET PROGRESS($ProgressBarID; $value/100)
+	End case 
 End if 
-```
 
-To support the stop button in the progress bar, Storage needs to be used to share progress bar and worker IDs. See example in test_curl - download.
-```4D
-	// enable stop button in progress bar
-	Use (Storage.FileTransfer_Progress)
-		Storage.FileTransfer_Progress[$progressid]:=New shared object()
-	End use 
-	$ftp.useCallback(Formula(ProgressCallback); $progressid)
 ```
 
-After execution of download/upload/etc, check:
-```4D
-	If (Bool(Storage.FileTransfer_Progress[$progressid].Stop))  // check stop button if it was set, remove from storage
-		// user canceled!!
-```
 
-Don't forget to remove the object from storage when done.
 See test_curl - download for a full example

Documentation/Readme_curl.MD

@@ -92,18 +92,7 @@ While FTPS is using standard TLS certificates (similar to HTTPS), SFTP is using
 [From Wikipedia](https://en.wikipedia.org/wiki/SSH_File_Transfer_Protocol)
 This protocol assumes that it is run over a secure channel, such as SSH, that the server has already authenticated the client, and that the identity of the client user is available to the protocol.
 
-While you normally do not simply provide credentials (user+password) to login, you need to estabilish upfront a SSH connection to store the ssh key from the SFTP Server in the local keyring. The benefit is that you do not need username+password for login, all goes through keys. But it is possible to use user+password similar as for FTPS, while you need to be aware that in this case you cannot trust that the connection really go to the right server, this is a possible security issue.
-
-Most easiest way to check, exchange and store client and server keys is to open a terminal window (using Terminal on Mac/Terminal or Console on Windows) and enter:
-```
-ssh username@sftp.servername.com
-```
-
-This will request the password and display the ssh hash, asking if you accept to store it in your .ssh/authorized_keys file.
-In a similar way you could exchange keys upfront to avoid using passwords at all to enhance security.
-Google "ssh key authentication" for more help and examples.
-
-As soon the authentication was done once via ssh (or the key is stored in your authorized_keys file by another way), the class can be used without providing credentials, just the URL is enough.
+Using SFTP you might either use username+password as you would do with FTPS, or exchange keys. To use SFTP via keys, establish upfront a SSH connection using Terminal, this setup will be reused from cURL.
 
 # Class Documentation
 

Project/Sources/Classes/FileTransfer_Dropbox.4dm

@@ -111,6 +111,9 @@ Function setTimeout($timeout : Integer)
 Function setAsyncMode($async : Boolean)
 	This:C1470._async:=$async
 
+Function enableStopButton($enable : Object)
+	This:C1470._enableStopButton:=$enable
+	
 Function stop()
 	If (This:C1470._worker#Null:C1517)
 		This:C1470._worker.terminate()
@@ -155,7 +158,7 @@ Function _parseDirListing($success : Object)
 
 Function _runWorker($para : Text)->$result : Object
 	If (This:C1470._Callback#Null:C1517)
-		$workerpara:=cs:C1710.SystemWorkerProperties.new("dropbox"; This:C1470.onData; This:C1470._Callback; This:C1470._CallbackID)
+		$workerpara:=cs:C1710.SystemWorkerProperties.new("dropbox"; This:C1470.onData; This:C1470._Callback; This:C1470._CallbackID; This:C1470._enableStopButton)
 	Else 
 		$workerpara:=cs:C1710.SystemWorkerProperties.new("dropbox"; This:C1470.onData)
 	End if 

Project/Sources/Classes/FileTransfer_GDrive.4dm

@@ -318,6 +318,9 @@ Function useCallback($callback : 4D:C1709.Function; $ID : Text)
 Function setAsyncMode($async : Boolean)
 	This:C1470._async:=$async
 
+Function enableStopButton($enable : Object)
+	This:C1470._enableStopButton:=$enable
+	
 Function setTimeout($timeout : Integer)
 	This:C1470._timeout:=$timeout
 
@@ -373,7 +376,7 @@ Function _parseDirListing($success : Object)
 
 Function _runWorker($para : Text)->$result : Object
 	If (This:C1470._Callback#Null:C1517)
-		$workerpara:=cs:C1710.SystemWorkerProperties.new("gdrive"; This:C1470.onData; This:C1470._Callback; This:C1470._CallbackID)
+		$workerpara:=cs:C1710.SystemWorkerProperties.new("gdrive"; This:C1470.onData; This:C1470._Callback; This:C1470._CallbackID; This:C1470._enableStopButton)
 	Else 
 		$workerpara:=cs:C1710.SystemWorkerProperties.new("gdrive"; This:C1470.onData)
 	End if 

Project/Sources/Classes/FileTransfer_curl.4dm

@@ -17,6 +17,7 @@ Class constructor($hostname : Text; $username : Text; $password : Text; $protoco
 		This:C1470._return:=Char:C90(10)  //Char(13)+Char(10)
 	End if 
 	This:C1470._timeout:=0
+	This:C1470._enableStopButton:=False:C215
 
 	//MARK: Settings
 Function validate()->$success : Object
@@ -75,6 +76,9 @@ Function setPath($path : Text)
 Function enableProgressData($enable : Boolean)
 	This:C1470._noProgress:=Not:C34($enable)
 
+Function enableStopButton($enable : Object)
+	This:C1470._enableStopButton:=$enable
+	
 Function useCallback($callback : 4D:C1709.Function; $ID : Text)
 	ASSERT:C1129(Value type:C1509($callback)=Is object:K8:27; "Callback must be of type function")
 	ASSERT:C1129(OB Instance of:C1731($callback; 4D:C1709.Function); "Callback must be of type function")
@@ -303,7 +307,7 @@ Function _buildURL()->$url : Text
 
 Function _runWorker($para : Text)->$result : Object
 	If (This:C1470._Callback#Null:C1517)
-		$workerpara:=cs:C1710.SystemWorkerProperties.new("curl"; This:C1470.onData; This:C1470._Callback; This:C1470._CallbackID)
+		$workerpara:=cs:C1710.SystemWorkerProperties.new("curl"; This:C1470.onData; This:C1470._Callback; This:C1470._CallbackID; This:C1470._enableStopButton)
 	Else 
 		$workerpara:=cs:C1710.SystemWorkerProperties.new("curl"; This:C1470.onData)
 	End if 
@@ -338,7 +342,6 @@ Function _runWorker($para : Text)->$result : Object
 	$command:=$path+" "+$para
 	$old:=Method called on error:C704
 	ON ERR CALL:C155(Formula:C1597(ErrorHandler).source)
-	$workerpara.variables:=New object:C1471("userCancel"; "false")
 	This:C1470._worker:=4D:C1709.SystemWorker.new($command; $workerpara)
 	$worker:=This:C1470._worker
 
@@ -348,25 +351,22 @@ Function _runWorker($para : Text)->$result : Object
 		Else 
 			$waittimeout:=(This:C1470._timeout=0) ? 60 : This:C1470._timeout
 			$worker.wait($waittimeout)
-			If (Bool:C1537($worker.userCancel))
-				$result:=New object:C1471("responseError"; "Cancel by user"; "success"; False:C215)
-			Else 
-				If (($worker.responseError#Null:C1517) && ($worker.responseError#""))
-					$result:=New object:C1471("responseError"; $worker.responseError; "success"; False:C215)
-					$pos:=Position:C15("curl: "; $worker.responseError; *)
-					If ($pos>0)
-						$result.error:=Replace string:C233(Substring:C12($worker.responseError; $pos+6); Char:C90(10); "")
+			
+			If (($worker.responseError#Null:C1517) && ($worker.responseError#""))
+				$result:=New object:C1471("responseError"; $worker.responseError; "success"; False:C215)
+				$pos:=Position:C15("curl: "; $worker.responseError; *)
+				If ($pos>0)
+					$result.error:=Replace string:C233(Substring:C12($worker.responseError; $pos+6); Char:C90(10); "")
+				Else 
+					// seems not to be an error, curl set's process bar in error and no result in response.
+					If ($worker.response#"")
+						$result:=New object:C1471("data"; $worker.response; "success"; True:C214)
 					Else 
-						// seems not to be an error, curl set's process bar in error and no result in response.
-						If ($worker.response#"")
-							$result:=New object:C1471("data"; $worker.response; "success"; True:C214)
-						Else 
-							$result:=New object:C1471("data"; $worker.responseError; "success"; True:C214)
-						End if 
+						$result:=New object:C1471("data"; $worker.responseError; "success"; True:C214)
 					End if 
-				Else 
-					$result:=New object:C1471("data"; $worker.response; "success"; True:C214)
 				End if 
+			Else 
+				$result:=New object:C1471("data"; $worker.response; "success"; True:C214)
 			End if 
 		End if 
 	Else