lcl: MaxLength redo:

- MaxLength = 0 => no limit, MaxLength > 0 => limit. Default = 0 for memo, combo and edit
  - fix gtk, gtk2 code where MaxLength = -1 was used for unlimited length in Memo (why? combo and edit used 0)
  - fix qt combobox SetLength (was occasional forgotten?)
  - cleanup

git-svn-id: trunk@17365 -

lcl/include/customcombobox.inc

@@ -149,13 +149,15 @@ end;
 
   Set the maximum length for user input.
  ------------------------------------------------------------------------------}
-procedure TCustomComboBox.SetMaxLength(Val : integer);
+procedure TCustomComboBox.SetMaxLength(AValue: integer);
 begin
-  if Val < 0 then Val:= 0;
-  if Val<>MaxLength then begin
-    fMaxlength:=Val;
+  if AValue < 0 then
+    AValue := 0;
+  if AValue <> MaxLength then
+  begin
+    FMaxlength := AValue;
     if HandleAllocated then
-      TWSCustomComboBoxClass(WidgetSetClass).SetMaxLength(Self, Val);
+      TWSCustomComboBoxClass(WidgetSetClass).SetMaxLength(Self, AValue);
   end;
 end;
 
@@ -166,11 +168,11 @@ end;
 
   Get the maximum length for user input.
  ------------------------------------------------------------------------------}
-function TCustomComboBox.GetMaxLength : integer;
+function TCustomComboBox.GetMaxLength: integer;
 begin
   if HandleAllocated then
     FMaxLength := TWSCustomComboBoxClass(WidgetSetClass).GetMaxLength(Self);
-  Result:=FMaxLength;
+  Result := FMaxLength;
 end;
 
 {------------------------------------------------------------------------------
@@ -749,9 +751,9 @@ begin
   ControlStyle := ControlStyle - [csCaptureMouse];
   SetInitialBounds(0,0,GetControlClassDefaultSize.X,GetControlClassDefaultSize.Y);
   FItems := TStringlist.Create;
-  FItemIndex:=-1;
-  FMaxLength := -1;
-  FDropDownCount:=8;
+  FItemIndex := -1;
+  FMaxLength := 0;
+  FDropDownCount := 8;
   FCanvas := TControlCanvas.Create;
   TControlCanvas(FCanvas).Control := Self;
   ArrowKeysTraverseList := True;

lcl/include/customedit.inc

@@ -50,7 +50,7 @@ begin
   //TCustomMemo also inherits from here but it's create changes fcompstyle to csMemo
   ControlStyle := ControlStyle - [csCaptureMouse];
   FCompStyle := csEdit;
-  FMaxLength:= -1;
+  FMaxLength := 0;
   ParentColor := false;
   TabStop := true;
   SetInitialBounds(0,0,GetControlClassDefaultSize.X,GetControlClassDefaultSize.Y);
@@ -294,10 +294,14 @@ end;
  ------------------------------------------------------------------------------}
 procedure TCustomEdit.SetMaxLength(Value : Integer);
 begin
-  if Value=MaxLength then exit;
-  FMaxLength := Value;
-  if HandleAllocated then
-    TWSCustomEditClass(WidgetSetClass).SetMaxLength(Self, Value);
+  if Value < 0 then
+    Value := 0;
+  if Value <> MaxLength then
+  begin
+    FMaxLength := Value;
+    if HandleAllocated then
+      TWSCustomEditClass(WidgetSetClass).SetMaxLength(Self, Value);
+  end;
 end;
 
 {------------------------------------------------------------------------------

lcl/interfaces/gtk/gtkcallback.inc

@@ -1972,17 +1972,16 @@ begin
     if (NewTextLength = 1) and (char^ = #13) and (LineEnding = #10) then
       char^ := #10;
     Memo:= TCustomMemo(Data);
-    if Memo.MaxLength < 0 then Exit;
+    if Memo.MaxLength <= 0 then Exit;
 
     CurrLength:= gtk_text_get_length(PGtkText(widget));
     if CurrLength + NewTextLength <= Memo.MaxLength then Exit;
 
     CutLength:= CurrLength + NewTextLength - Memo.MaxLength;
 
-    if NewTextLength - CutLength > 0 then begin
+    if NewTextLength - CutLength > 0 then
       gtk_editable_insert_text(PGtkEditable(widget), char,
                                NewTextLength - CutLength, Position);
-    end;
 
     g_signal_stop_emission_by_name(PGtkObject(widget), 'insert_text');
   end;

lcl/interfaces/gtk/gtkwsstdctrls.pp

@@ -1817,17 +1817,16 @@ end;
 class procedure TGtkWSCustomMemo.SetMaxLength(const ACustomEdit: TCustomEdit;
   NewLength: integer);
 var
-  ImplWidget   : PGtkWidget;
+  ImplWidget: PGtkWidget;
   i: integer;
 begin
-  if (ACustomEdit.MaxLength >= 0) then begin
-    //debugln('TGtkWSCustomMemo.SetMaxLength ',DbgSName(ACustomEdit));
-    ImplWidget:= GetWidgetInfo(PGtkWidget(ACustomEdit.Handle), true)^.CoreWidget;
-    i:= gtk_text_get_length(GTK_TEXT(ImplWidget));
-    if i > ACustomEdit.MaxLength then begin
+  if (ACustomEdit.MaxLength > 0) then 
+  begin
+    ImplWidget := GetWidgetInfo(PGtkWidget(ACustomEdit.Handle), true)^.CoreWidget;
+    i := gtk_text_get_length(GTK_TEXT(ImplWidget));
+    if i > ACustomEdit.MaxLength then 
        gtk_editable_delete_text(PGtkOldEditable(ImplWidget),
                                 ACustomEdit.MaxLength, i);
-    end;
   end;
 end;
 

lcl/interfaces/gtk2/gtk2wscustommemo.inc

@@ -50,18 +50,19 @@ begin
   { GTK2 does not provide its own max. length for memos
     so we have to do our own. }
 
-  if TControl(WidgetInfo^.LCLObject) is TCustomMemo then begin
-    Memo:= TCustomMemo(WidgetInfo^.LCLObject);
-    if Memo.MaxLength < 0 then Exit;
+  if TControl(WidgetInfo^.LCLObject) is TCustomMemo then
+  begin
+    Memo := TCustomMemo(WidgetInfo^.LCLObject);
+    if Memo.MaxLength <= 0 then Exit;
 
-    CurrLength:= gtk_text_buffer_get_char_count(TextBuffer);
-    if CurrLength + NewTextLength <= Memo.MaxLength then Exit;
+    CurrLength := gtk_text_buffer_get_char_count(TextBuffer);
+    if CurrLength + NewTextLength <= Memo.MaxLength then
+      Exit;
 
-    CutLength:= CurrLength + NewTextLength - Memo.MaxLength;
+    CutLength := CurrLength + NewTextLength - Memo.MaxLength;
 
-    if NewTextLength - CutLength > 0 then begin
+    if NewTextLength - CutLength > 0 then
       gtk_text_buffer_insert(TextBuffer, StartIter, TheText, NewTextLength - CutLength);
-    end;
 
     g_signal_stop_emission_by_name(PGtkObject(Textbuffer), 'insert-text');
   end;

lcl/interfaces/qt/qtwinapi.inc

@@ -4336,8 +4336,10 @@ end;
 
  ------------------------------------------------------------------------------}
 function TQtWidgetSet.SetFocus(hWnd: HWND): HWND;
+{$IFDEF UNIX}
 var
   QtEdit: IQtEdit;
+{$ENDIF}
 begin
   if hwnd<>0 then
   begin

lcl/interfaces/qt/qtwsstdctrls.pp

@@ -96,6 +96,7 @@ type
       NewTraverseList: boolean); override;
     class procedure SetDropDownCount(const ACustomComboBox: TCustomComboBox; NewCount: Integer); override;
     class procedure SetItemIndex(const ACustomComboBox: TCustomComboBox; NewIndex: integer); override;
+    class procedure SetMaxLength(const ACustomComboBox: TCustomComboBox; NewLength: integer); override;
     class procedure SetStyle(const ACustomComboBox: TCustomComboBox; NewStyle: TComboBoxStyle); override;
 
     class procedure Sort(const ACustomComboBox: TCustomComboBox; AList: TStrings; IsSorted: boolean); override;
@@ -1320,6 +1321,28 @@ begin
   TQtComboBox(ACustomComboBox.Handle).setCurrentIndex(NewIndex);
 end;
 
+class procedure TQtWSCustomComboBox.SetMaxLength(
+  const ACustomComboBox: TCustomComboBox; NewLength: integer);
+var
+  Widget: TQtWidget;
+  QtEdit: IQtEdit;
+  MaxLength: Integer;
+begin
+  if not WSCheckHandleAllocated(ACustomComboBox, 'SetMaxLength') then
+    Exit;
+
+  Widget := TQtWidget(ACustomComboBox.Handle);
+  if Supports(Widget, IQtEdit, QtEdit) then
+  begin
+    // qt doesn't accept -1
+    MaxLength := QtEdit.getMaxLength;
+    if (NewLength <= 0) or (NewLength > QtMaxEditLength) then
+      NewLength := QtMaxEditLength;
+    if NewLength <> MaxLength then
+      QtEdit.setMaxLength(NewLength);
+  end;
+end;
+
 class procedure TQtWSCustomComboBox.SetStyle(
   const ACustomComboBox: TCustomComboBox; NewStyle: TComboBoxStyle);
 begin

lcl/stdctrls.pp

@@ -322,7 +322,7 @@ type
     procedure SetDroppedDown(const AValue: Boolean); virtual;
     procedure SetItemHeight(const AValue: Integer); virtual;
     procedure SetItemIndex(Val: integer); virtual;
-    procedure SetMaxLength(Val: integer); virtual;
+    procedure SetMaxLength(AValue: integer); virtual;
     procedure SetSelLength(Val: integer); virtual;
     procedure SetSelStart(Val: integer); virtual;
     procedure SetSelText(const Val: string); virtual;
@@ -384,9 +384,8 @@ type
     property SelStart: integer read GetSelStart write SetSelStart;// byte position
     property SelText: String read GetSelText write SetSelText;
     property Style: TComboBoxStyle read FStyle write SetStyle;
-    property Text;
-  published
     property TabStop default true;
+    property Text;
   end;
 
 
@@ -729,7 +728,7 @@ type
     property CaretPos: TPoint read GetCaretPos write SetCaretPos;
     property CharCase: TEditCharCase read FCharCase write SetCharCase default ecNormal;
     property EchoMode: TEchoMode read FEchoMode write SetEchoMode default emNormal;
-    property MaxLength: Integer read FMaxLength write SetMaxLength default -1;
+    property MaxLength: Integer read FMaxLength write SetMaxLength default 0;
     property Modified: Boolean read GetModified write SetModified;
     property OnChange: TNotifyEvent read FOnChange write FOnChange;
     property PasswordChar: Char read FPasswordChar write SetPasswordChar default #0;