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NavisPythonShell/PythonConsoleControl/PythonTextEditor.cs at master · rompik/NavisPythonShell · GitHub
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// Copyright (c) 2010 Joe Moorhouse
using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Linq
;
using
System
.
Text
;
using
ICSharpCode
.
AvalonEdit
;
using
ICSharpCode
.
AvalonEdit
.
Editing
;
using
ICSharpCode
.
AvalonEdit
.
Document
;
using
ICSharpCode
.
AvalonEdit
.
CodeCompletion
;
using
System
.
Windows
;
using
System
.
Windows
.
Media
;
using
System
.
Windows
.
Threading
;
using
System
.
Windows
.
Input
;
using
System
.
Threading
;
using
System
.
Diagnostics
;
namespace
PythonConsoleControl
{
/// <summary>
/// Interface console to AvalonEdit and handle autocompletion.
/// </summary>
public
class
PythonTextEditor
{
internal
TextEditor
textEditor
;
internal
TextArea
textArea
;
StringBuilder
writeBuffer
=
new
StringBuilder
(
)
;
volatile
bool
writeInProgress
=
false
;
PythonConsoleCompletionWindow
completionWindow
=
null
;
int
completionEventIndex
=
0
;
int
descriptionEventIndex
=
1
;
WaitHandle
[
]
completionWaitHandles
;
AutoResetEvent
completionRequestedEvent
=
new
AutoResetEvent
(
false
)
;
AutoResetEvent
descriptionRequestedEvent
=
new
AutoResetEvent
(
false
)
;
Thread
completionThread
;
PythonConsoleCompletionDataProvider
completionProvider
=
null
;
Action
<
Action
>
completionDispatcher
=
new
Action
<
Action
>
(
(
command
)
=>
command
(
)
)
;
// dummy completion dispatcher
public
PythonTextEditor
(
TextEditor
textEditor
)
{
this
.
textEditor
=
textEditor
;
this
.
textArea
=
textEditor
.
TextArea
;
completionWaitHandles
=
new
WaitHandle
[
]
{
completionRequestedEvent
,
descriptionRequestedEvent
}
;
completionThread
=
new
Thread
(
new
ThreadStart
(
Completion
)
)
;
completionThread
.
Priority
=
ThreadPriority
.
Lowest
;
//completionThread.SetApartmentState(ApartmentState.STA);
completionThread
.
IsBackground
=
true
;
completionThread
.
Start
(
)
;
}
/// <summary>
/// Set the dispatcher to use to force code completion to happen on a specific thread
/// if necessary.
/// </summary>
public
void
SetCompletionDispatcher
(
Action
<
Action
>
newDispatcher
)
{
completionDispatcher
=
newDispatcher
;
}
public
bool
WriteInProgress
{
get
{
return
writeInProgress
;
}
}
public
ICollection
<
CommandBinding
>
CommandBindings
{
get
{
return
(
this
.
textArea
.
ActiveInputHandler
as
TextAreaDefaultInputHandler
)
.
CommandBindings
;
}
}
public
void
Write
(
string
text
)
{
Write
(
text
,
false
)
;
}
Stopwatch
sw
;
public
void
Write
(
string
text
,
bool
allowSynchronous
)
{
//text = text.Replace("\r\r\n", "\r\n");
text
=
text
.
Replace
(
"
\r
\r
\n
"
,
"
\r
"
)
;
text
=
text
.
Replace
(
"
\r
\n
"
,
"
\r
"
)
;
if
(
allowSynchronous
)
{
MoveToEnd
(
)
;
PerformTextInput
(
text
)
;
return
;
}
lock
(
writeBuffer
)
{
writeBuffer
.
Append
(
text
)
;
}
if
(
!
writeInProgress
)
{
writeInProgress
=
true
;
ThreadPool
.
QueueUserWorkItem
(
new
WaitCallback
(
CheckAndOutputWriteBuffer
)
)
;
sw
=
Stopwatch
.
StartNew
(
)
;
}
}
private
void
CheckAndOutputWriteBuffer
(
Object
stateInfo
)
{
AutoResetEvent
writeCompletedEvent
=
new
AutoResetEvent
(
false
)
;
Action
action
=
new
Action
(
delegate
(
)
{
string
toWrite
;
lock
(
writeBuffer
)
{
toWrite
=
writeBuffer
.
ToString
(
)
;
writeBuffer
.
Remove
(
0
,
writeBuffer
.
Length
)
;
//writeBuffer.Clear();
}
MoveToEnd
(
)
;
PerformTextInput
(
toWrite
)
;
writeCompletedEvent
.
Set
(
)
;
}
)
;
while
(
true
)
{
// Clear writeBuffer and write out.
textArea
.
Dispatcher
.
BeginInvoke
(
action
,
DispatcherPriority
.
Normal
)
;
// Check if writeBuffer has refilled in the meantime; if so clear and write out again.
writeCompletedEvent
.
WaitOne
(
)
;
lock
(
writeBuffer
)
{
if
(
writeBuffer
.
Length
==
0
)
{
writeInProgress
=
false
;
break
;
}
}
}
}
private
void
MoveToEnd
(
)
{
int
lineCount
=
textArea
.
Document
.
LineCount
;
if
(
textArea
.
Caret
.
Line
!=
lineCount
)
textArea
.
Caret
.
Line
=
textArea
.
Document
.
LineCount
;
int
column
=
textArea
.
Document
.
Lines
[
lineCount
-
1
]
.
Length
+
1
;
if
(
textArea
.
Caret
.
Column
!=
column
)
textArea
.
Caret
.
Column
=
column
;
}
private
void
PerformTextInput
(
string
text
)
{
if
(
text
==
"
\n
"
||
text
==
"
\r
\n
"
)
{
string
newLine
=
TextUtilities
.
GetNewLineFromDocument
(
textArea
.
Document
,
textArea
.
Caret
.
Line
)
;
using
(
textArea
.
Document
.
RunUpdate
(
)
)
{
textArea
.
Selection
.
ReplaceSelectionWithText
(
newLine
)
;
}
}
else
textArea
.
Selection
.
ReplaceSelectionWithText
(
text
)
;
textArea
.
Caret
.
BringCaretToView
(
)
;
}
public
int
Column
{
get
{
return
textArea
.
Caret
.
Column
;
}
set
{
textArea
.
Caret
.
Column
=
value
;
}
}
/// <summary>
/// Gets the current cursor line.
/// </summary>
public
int
Line
{
get
{
return
textArea
.
Caret
.
Line
;
}
set
{
textArea
.
Caret
.
Line
=
value
;
}
}
/// <summary>
/// Gets the total number of lines in the text editor.
/// </summary>
public
int
TotalLines
{
get
{
return
textArea
.
Document
.
LineCount
;
}
}
public
delegate
string
StringAction
(
)
;
/// <summary>
/// Gets the text for the specified line.
/// </summary>
public
string
GetLine
(
int
index
)
{
return
(
string
)
textArea
.
Dispatcher
.
Invoke
(
new
StringAction
(
delegate
(
)
{
DocumentLine
line
=
textArea
.
Document
.
Lines
[
index
]
;
return
textArea
.
Document
.
GetText
(
line
)
;
}
)
)
;
}
/// <summary>
/// Replaces the text at the specified index on the current line with the specified text.
/// </summary>
public
void
Replace
(
int
index
,
int
length
,
string
text
)
{
//int currentLine = textArea.Caret.Line - 1;
int
currentLine
=
textArea
.
Document
.
LineCount
-
1
;
int
startOffset
=
textArea
.
Document
.
Lines
[
currentLine
]
.
Offset
;
textArea
.
Document
.
Replace
(
startOffset
+
index
,
length
,
text
)
;
}
public
event
TextCompositionEventHandler
TextEntering
{
add
{
textArea
.
TextEntering
+=
value
;
}
remove
{
textArea
.
TextEntering
-=
value
;
}
}
public
event
TextCompositionEventHandler
TextEntered
{
add
{
textArea
.
TextEntered
+=
value
;
}
remove
{
textArea
.
TextEntered
-=
value
;
}
}
public
event
KeyEventHandler
PreviewKeyDown
{
add
{
textArea
.
PreviewKeyDown
+=
value
;
}
remove
{
textArea
.
PreviewKeyDown
-=
value
;
}
}
public
int
SelectionStart
{
get
{
return
textArea
.
Selection
.
SurroundingSegment
.
Offset
;
}
}
public
int
SelectionLength
{
get
{
return
textArea
.
Selection
.
Length
;
}
}
public
bool
SelectionIsMultiline
{
get
{
return
textArea
.
Selection
.
IsMultiline
;
}
}
public
int
SelectionStartColumn
{
get
{
int
startOffset
=
textArea
.
Selection
.
SurroundingSegment
.
Offset
;
return
startOffset
-
textArea
.
Document
.
GetLineByOffset
(
startOffset
)
.
Offset
+
1
;
}
}
public
int
SelectionEndColumn
{
get
{
int
endOffset
=
textArea
.
Selection
.
SurroundingSegment
.
EndOffset
;
return
endOffset
-
textArea
.
Document
.
GetLineByOffset
(
endOffset
)
.
Offset
+
1
;
}
}
public
PythonConsoleCompletionDataProvider
CompletionProvider
{
get
{
return
completionProvider
;
}
set
{
completionProvider
=
value
;
}
}
public
Thread
CompletionThread
{
get
{
return
completionThread
;
}
}
public
bool
StopCompletion
(
)
{
if
(
completionProvider
.
AutocompletionInProgress
)
{
// send Ctrl-C abort
completionThread
.
Abort
(
new
Microsoft
.
Scripting
.
KeyboardInterruptException
(
""
)
)
;
return
true
;
}
return
false
;
}
public
PythonConsoleCompletionWindow
CompletionWindow
{
get
{
return
completionWindow
;
}
}
public
void
ShowCompletionWindow
(
)
{
completionRequestedEvent
.
Set
(
)
;
}
public
void
UpdateCompletionDescription
(
)
{
descriptionRequestedEvent
.
Set
(
)
;
}
/// <summary>
/// Perform completion actions on the background completion thread.
/// </summary>
void
Completion
(
)
{
while
(
true
)
{
int
action
=
WaitHandle
.
WaitAny
(
completionWaitHandles
)
;
if
(
action
==
completionEventIndex
&&
completionProvider
!=
null
)
BackgroundShowCompletionWindow
(
)
;
if
(
action
==
descriptionEventIndex
&&
completionProvider
!=
null
&&
completionWindow
!=
null
)
BackgroundUpdateCompletionDescription
(
)
;
}
}
/// <summary>
/// Obtain completions (this runs in its own thread)
/// </summary>
internal
void
BackgroundShowCompletionWindow
(
)
//ICompletionItemProvider
{
// provide AvalonEdit with the data:
string
itemForCompletion
=
""
;
textArea
.
Dispatcher
.
Invoke
(
new
Action
(
delegate
(
)
{
DocumentLine
line
=
textArea
.
Document
.
Lines
[
textArea
.
Caret
.
Line
-
1
]
;
itemForCompletion
=
textArea
.
Document
.
GetText
(
line
)
;
}
)
)
;
completionDispatcher
.
Invoke
(
new
Action
(
delegate
(
)
{
try
{
ICompletionData
[
]
completions
=
completionProvider
.
GenerateCompletionData
(
itemForCompletion
)
;
if
(
completions
!=
null
&&
completions
.
Length
>
0
)
textArea
.
Dispatcher
.
BeginInvoke
(
new
Action
(
delegate
(
)
{
completionWindow
=
new
PythonConsoleCompletionWindow
(
textArea
,
this
)
;
IList
<
ICompletionData
>
data
=
completionWindow
.
CompletionList
.
CompletionData
;
foreach
(
ICompletionData
completion
in
completions
)
{
data
.
Add
(
completion
)
;
}
completionWindow
.
Show
(
)
;
completionWindow
.
Closed
+=
delegate
{
completionWindow
=
null
;
}
;
}
)
)
;
}
catch
(
Exception
exception
)
{
MessageBox
.
Show
(
exception
.
ToString
(
)
,
"Error"
)
;
}
}
)
)
;
}
internal
void
BackgroundUpdateCompletionDescription
(
)
{
completionDispatcher
.
Invoke
(
new
Action
(
delegate
(
)
{
try
{
completionWindow
.
UpdateCurrentItemDescription
(
)
;
}
catch
(
Exception
exception
)
{
MessageBox
.
Show
(
exception
.
ToString
(
)
,
"Error"
)
;
}
}
)
)
;
}
public
void
RequestCompletioninsertion
(
TextCompositionEventArgs
e
)
{
if
(
completionWindow
!=
null
)
completionWindow
.
CompletionList
.
RequestInsertion
(
e
)
;
// if autocompletion still in progress, terminate
StopCompletion
(
)
;
}
}
}
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