From 662e9519a7883645789c5836ce938d5cd92a4e40 Mon Sep 17 00:00:00 2001
From: martin <laz.git@mfriebe.de>
Date: Fri, 9 Jul 2010 16:25:10 +0000
Subject: [PATCH] SynCompletion: Cancel on Topline change (window would be
 misplaced otherwise)

git-svn-id: trunk@26548 -
---
 components/synedit/syncompletion.pas | 34 ++++++++++++++++++++++++-
 components/synedit/synedit.pp        | 37 ++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/components/synedit/syncompletion.pas b/components/synedit/syncompletion.pas
index 5749880e15..741414d96f 100644
--- a/components/synedit/syncompletion.pas
+++ b/components/synedit/syncompletion.pas
@@ -144,7 +144,11 @@ type
     fCurrentEditor: TComponent;
     FOnMeasureItem: TSynBaseCompletionMeasureItem;
     FOnPositionChanged: TNotifyEvent;
+    procedure SetCurrentEditor(const AValue: TComponent);
     procedure SetLongLineHintTime(const AValue: Integer);
+    procedure EditorStatusChanged(Sender: TObject; Changes: TSynStatusChanges);
+  protected
+    procedure SetVisible(Value: Boolean); override;
   public
     constructor Create(AOwner: Tcomponent); override;
     destructor Destroy; override;
@@ -166,7 +170,7 @@ type
       write SetNbLinesInWindow;
     property ClSelect: TColor read FClSelect write FClSelect;
     property CaseSensitive: boolean read FCaseSensitive write FCaseSensitive;
-    property CurrentEditor: TComponent read fCurrentEditor write fCurrentEditor;
+    property CurrentEditor: TComponent read fCurrentEditor write SetCurrentEditor;
     property FontHeight:integer read FFontHeight;
     property OnSearchPosition:TSynBaseCompletionSearchPosition
       read FOnSearchPosition write FOnSearchPosition;
@@ -812,6 +816,34 @@ begin
   FHintTimer.Interval := AValue;
 end;
 
+procedure TSynBaseCompletionForm.EditorStatusChanged(Sender: TObject;
+  Changes: TSynStatusChanges);
+begin
+  if (scTopLine in Changes) and Assigned(OnCancel) then
+    OnCancel(Self);
+end;
+
+procedure TSynBaseCompletionForm.SetCurrentEditor(const AValue: TComponent);
+begin
+  if fCurrentEditor = AValue then exit;
+  if fCurrentEditor <> nil then
+    TSynEdit(fCurrentEditor).UnRegisterStatusChangedHandler({$IFDEF FPC}@{$ENDIF}EditorStatusChanged);
+  fCurrentEditor := AValue;
+  if (fCurrentEditor <> nil) and Visible then
+    TSynEdit(fCurrentEditor).RegisterStatusChangedHandler({$IFDEF FPC}@{$ENDIF}EditorStatusChanged);
+end;
+
+procedure TSynBaseCompletionForm.SetVisible(Value: Boolean);
+begin
+  inherited SetVisible(Value);
+  if (fCurrentEditor <> nil) then begin
+    if Visible then
+      TSynEdit(fCurrentEditor).RegisterStatusChangedHandler({$IFDEF FPC}@{$ENDIF}EditorStatusChanged)
+    else
+      TSynEdit(fCurrentEditor).UnRegisterStatusChangedHandler({$IFDEF FPC}@{$ENDIF}EditorStatusChanged);
+  end;
+end;
+
 procedure TSynBaseCompletionForm.SetItemList(const Value: TStrings);
 begin
   FItemList.Assign(Value);
diff --git a/components/synedit/synedit.pp b/components/synedit/synedit.pp
index 9f4cd02340..d006ece6c1 100644
--- a/components/synedit/synedit.pp
+++ b/components/synedit/synedit.pp
@@ -306,6 +306,13 @@ type
       var Command: TSynEditorCommand; var ComboKeyStrokes: TSynEditKeyStrokes);
   end;
 
+  { TSynStatusChangedHandlerList }
+
+  TSynStatusChangedHandlerList = Class(TMethodList)
+  public
+    procedure CallStatusChangedHandlers(Sender: TObject; Changes: TSynStatusChanges);
+  end;
+
   TSynMouseLinkEvent = procedure (
     Sender: TObject; X, Y: Integer; var AllowMouseLink: Boolean) of object;
 
@@ -418,6 +425,7 @@ type
     fTSearch: TSynEditSearch;
     fHookedCommandHandlers: TList;
     FHookedKeyTranslationList: TSynHookedKeyTranslationList;
+    FStatusChangedList: TSynStatusChangedHandlerList;
     FPlugins: TList;
     fScrollTimer: TTimer;
     fScrollDeltaX, fScrollDeltaY: Integer;
@@ -798,6 +806,10 @@ type
 
     procedure RegisterKeyTranslationHandler(AHandlerProc: THookedKeyTranslationEvent);
     procedure UnRegisterKeyTranslationHandler(AHandlerProc: THookedKeyTranslationEvent);
+
+    procedure RegisterStatusChangedHandler(AStatusChangeProc: TStatusChangeEvent);
+    procedure UnRegisterStatusChangedHandler(AStatusChangeProc: TStatusChangeEvent);
+
     function RowColumnToPixels(
                       {$IFDEF SYN_LAZARUS}const {$ENDIF}RowCol: TPoint): TPoint;
     function SearchReplace(const ASearch, AReplace: string;
@@ -1633,6 +1645,7 @@ begin
   Cursor := crIBeam;
   fPlugins := TList.Create;
   FHookedKeyTranslationList := TSynHookedKeyTranslationList.Create;
+  FStatusChangedList := TSynStatusChangedHandlerList.Create;
 {$IFDEF SYN_LAZARUS}
   // needed before setting color
   fMarkupHighCaret := TSynEditMarkupHighlightAllCaret.Create(self);
@@ -1887,6 +1900,7 @@ begin
   RemoveHandlers;
 
   FreeAndNil(FHookedKeyTranslationList);
+  FreeAndNil(FStatusChangedList);
   fHookedCommandHandlers:=nil;
   fPlugins:=nil;
   FCaret.Lines := nil;
@@ -8420,6 +8434,16 @@ begin
   FHookedKeyTranslationList.Remove(TMEthod(AHandlerProc));
 end;
 
+procedure TCustomSynEdit.RegisterStatusChangedHandler(AStatusChangeProc: TStatusChangeEvent);
+begin
+  FStatusChangedList.Add(TMethod(AStatusChangeProc));
+end;
+
+procedure TCustomSynEdit.UnRegisterStatusChangedHandler(AStatusChangeProc: TStatusChangeEvent);
+begin
+  FStatusChangedList.Remove(TMethod(AStatusChangeProc));
+end;
+
 procedure TCustomSynEdit.NotifyHookedCommandHandlers(AfterProcessing: boolean;
   var Command: TSynEditorCommand;
   var AChar: TUTF8Char; Data: pointer);
@@ -8474,6 +8498,7 @@ end;
 
 procedure TCustomSynEdit.DoOnStatusChange(Changes: TSynStatusChanges);
 begin
+  FStatusChangedList.CallStatusChangedHandlers(Self, Changes);
   if Assigned(fOnStatusChange) then begin
     fOnStatusChange(Self, fStatusChanges);
     fStatusChanges := [];
@@ -8647,6 +8672,18 @@ begin
       IsStartOfCombo, Handled, Command, False, ComboKeyStrokes);
 end;
 
+{ TSynStatusChangedHandlerList }
+
+procedure TSynStatusChangedHandlerList.CallStatusChangedHandlers(Sender: TObject;
+  Changes: TSynStatusChanges);
+var
+  i: Integer;
+begin
+  i:=Count;
+  while NextDownIndex(i) do
+    TStatusChangeEvent(Items[i])(Sender, Changes);
+end;
+
 initialization
   InitSynDefaultFont;
   SynDefaultBeautifier := TSynBeautifier.Create(Application);