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{
fpGUI - Free Pascal Graphical User Interface
Copyright (C) 2000 - 2001 by
Areca Systems GmbH / Sebastian Guenther
Copyright (C) 2006 by Graeme Geldenhuys
member of the fpGUI development team.
Edit class declarations
See the file COPYING.fpGUI, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{%mainunit fpgui.pp}
{$IFDEF read_interface}
{ TCustomEdit }
TCustomEdit = class(TWidget)
private
FFontColor: TColor;
FSelStart: integer;
FSelOffset: integer;
FCursorPos: Integer;
FPasswordChar: Char;
FOnChange: TNotifyEvent;
procedure SetFontColor(const AValue: TColor);
procedure SetPasswordChar(APasswordChar: Char);
procedure SetCursorPos(ACursorPos: Integer);
procedure DoMousePressed(pEvent: TMousePressedEventObj);
protected
procedure Paint(Canvas: TFCanvas); override;
function ProcessEvent(Event: TEventObj): Boolean; override;
procedure CalcSizes; override;
procedure EvKeyPressed(Key: Word; Shift: TShiftState); override;
procedure EvKeyChar(KeyChar: Char); override;
procedure EvTextChanged; override;
property CanExpandWidth default True;
property Cursor default crIBeam;
property PasswordChar: Char read FPasswordChar write SetPasswordChar default #0;
property CursorPos: Integer read FCursorPos write SetCursorPos;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property FontColor: TColor read FFontColor write SetFontColor;
procedure SetText(const AText: String); override;
public
constructor Create(AOwner: TComponent); override;
constructor Create(const pText: string; pOwner: TComponent); overload;
end;
TEdit = class(TCustomEdit)
published
property CanExpandWidth;
property Enabled;
property PasswordChar;
property Text;
property OnChange;
property FontColor;
end;
{$ENDIF read_interface}
{$IFDEF read_implementation}
// ===================================================================
// TCustomEdit
// ===================================================================
constructor TCustomEdit.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
WidgetStyle := WidgetStyle + [wsCaptureMouse, wsClickable, wsOpaque];
FCanExpandWidth := True;
FCursor := crIBeam;
FFontColor := clWindowText;
FCursorPos := 0;
end;
constructor TCustomEdit.Create(const pText: string; pOwner: TComponent);
begin
Create(pOwner);
Text := pText;
end;
procedure TCustomEdit.Paint(Canvas: TFCanvas);
var
Borders: TRect;
s: String;
x: Integer;
ItemRect: TRect;
ItemFlags: TItemFlags;
begin
ItemFlags := [];
Borders := Style.GetEditBoxBorders;
Style.DrawEditBox(Canvas, Rect(0, 0, BoundsSize.cx, BoundsSize.cy));
if not Canvas.IntersectClipRect(Rect(Borders.Left + 1, Borders.Top + 1,
BoundsSize.cx - Borders.Right - 1, BoundsSize.cy - Borders.Bottom - 1)) then
exit;
if wsEnabled in WidgetState then
Canvas.SetColor(Style.GetUIColor(FFontColor))
else
Canvas.SetColor(Style.GetUIColor(clGrayText));
if PasswordChar = #0 then
s := PChar(Text)
else
begin
SetLength(s, Length(Text));
if Length(Text) > 0 then
FillChar(s[1], Length(Text), PasswordChar);
end;
// drawing selection
if (FSelOffset <> 0) then
begin
if (wsHasFocus in WidgetState) and FindForm.IsActive then
begin
Include(ItemFlags, ifFocused);
Include(ItemFlags, ifSelected);
end;
ItemRect.Left := Canvas.TextWidth(Copy(s, 1, CursorPos - FSelOffset));
ItemRect.Top := 0;
ItemRect.Right := Canvas.TextWidth(Copy(s, 1, CursorPos));
ItemRect.Bottom := Height;
{
ItemRect := Rect(0, 0, Width, Height);
ItemRect.TopLeft := ItemRect.TopLeft + 1;
ItemRect.BottomRight := ItemRect.BottomRight - 2;
}
// InflateRect(ItemRect, -1, -1);
// Style.SetUIColor(Canvas, clWindowText);
{$Note Start here: Refine the selection rect}
Style.DrawItemBefore(Canvas, ItemRect, ItemFlags);
Style.DrawText(Canvas, (Borders.TopLeft + Point(1, 1)), s, WidgetState);
Style.DrawItemAfter(Canvas, ItemRect, ItemFlags);
end
else
Canvas.TextOut(Borders.TopLeft + Point(1, 1), s);
if wsHasFocus in WidgetState then
begin
Canvas.SetColor(Style.GetUIColor(clWindowText));
x := Borders.Left + 1 + Canvas.TextWidth(Copy(s, 1, CursorPos));
Canvas.DrawLine(Point(x, Borders.Top), Point(x, BoundsSize.cy - Borders.Bottom));
end;
end;
function TCustomEdit.ProcessEvent(Event: TEventObj): Boolean;
begin
if Event.InheritsFrom(TMousePressedEventObj) then
begin
// Result := True;
DoMousePressed(TMousePressedEventObj(Event));
// Writeln('>>> TMousePressedEventObj in ' + Classname);
end;
Result := inherited ProcessEvent(Event);
end;
procedure TCustomEdit.EvKeyPressed(Key: Word; Shift: TShiftState);
begin
if Shift * [ssShift, ssAlt, ssCtrl, ssMeta, ssSuper, ssHyper, ssAltGr] = [] then
begin
// Writeln('1');
case Key of
keyLeft, keyUp:
if CursorPos > 0 then
CursorPos := CursorPos - 1;
keyRight, keyDown:
if CursorPos < Length(Text) then
CursorPos := CursorPos + 1;
keyHome:
CursorPos := 0;
keyEnd:
CursorPos := Length(Text);
else
inherited EvKeyPressed(Key, Shift);
end;
end
{ else if Shift * [ssShift, ssAlt, ssCtrl, ssMeta, ssSuper, ssHyper, ssAltGr] = [ssShift] then
begin
Writeln('2');
case Key of
keyHome:
begin
FSelOffset := CursorPos;
CursorPos := 0;
end;
keyEnd:
begin
FSelOffset := CursorPos;
CursorPos := Length(Text);
end;
else
EvKeyPressed(Key, Shift);
end;
end
}
else
inherited EvKeyPressed(Key, Shift);
end;
procedure TCustomEdit.EvKeyChar(KeyChar: Char);
begin
case KeyChar of
#8: { Backspace }
if CursorPos > 0 then
begin
Text := Copy(Text, 1, CursorPos - 1) + Copy(Text, CursorPos + 1, Length(Text));
CursorPos := CursorPos - 1;
end;
#127: { Del }
if CursorPos < Length(Text) then
begin
Text := Copy(Text, 1, CursorPos) + Copy(Text, CursorPos + 2, Length(Text));
Redraw;
end;
#32..#126, #128..#255:
begin
Text := Copy(Text, 1, CursorPos) + KeyChar + Copy(Text, CursorPos + 1, Length(Text));
CursorPos := CursorPos + 1;
end;
else
inherited EvKeyChar(KeyChar);
end;
end;
procedure TCustomEdit.CalcSizes;
var
Borders: TRect;
begin
Borders := Style.GetEditBoxBorders;
FMinSize := gfxbase.Size(50, Borders.Top + Borders.Bottom +
FindForm.Wnd.Canvas.FontCellHeight + 2);
end;
procedure TCustomEdit.EvTextChanged;
begin
Redraw;
if Assigned(OnChange) then
OnChange(Self);
end;
procedure TCustomEdit.SetText(const AText: String);
begin
FSelOffset := 0;
inherited SetText(AText);
end;
procedure TCustomEdit.SetPasswordChar(APasswordChar: Char);
begin
if APasswordChar <> PasswordChar then
begin
FPasswordChar := APasswordChar;
Redraw;
end;
end;
procedure TCustomEdit.SetFontColor(const AValue: TColor);
begin
if FFontColor = AValue then exit;
FFontColor := AValue;
end;
procedure TCustomEdit.SetCursorPos(ACursorPos: Integer);
begin
if ACursorPos <> CursorPos then
begin
FCursorPos := ACursorPos;
Redraw;
end;
end;
procedure TCustomEdit.DoMousePressed(pEvent: TMousePressedEventObj);
var
Borders: TRect;
cp: integer;
cpx: integer;
lSideMargin: integer;
n: integer;
cx: integer;
lText: string;
// replicates pStrValue a set of pRepCount times.
function lReplicate(const pStrValue : string; pRepCount : Word) : string;
var
pResult, pValue: PChar;
lenValue: cardinal;
begin
if (pRepCount = 0) or (Pointer(pStrValue) = nil) then
exit;
lenValue := Length(pStrValue);
SetLength(Result, lenValue * pRepCount);
pResult := Pointer(Result);
pValue := Pointer(pStrValue);
while pRepCount <> 0 do
begin
Move(pValue^, pResult^, lenValue);
Inc(pResult, lenValue);
Dec(pRepCount);
end;
end;
begin
if (pEvent.Button = mbLeft) then
begin
// searching for the appropriate character position
Borders := Style.GetEditBoxBorders;
lSideMargin := Borders.Left + 1;
cp := CursorPos;
// Make sure we work with the correct displayed text
if FPasswordChar = #0 then
lText := Text
else
lText := lReplicate(FPasswordChar, Length(Text));
cpx := FindForm.Wnd.Canvas.TextWidth(Copy(lText, 1, CursorPos)) + lSideMargin;
for n := 0 to Length(Text) do
begin
cx := FindForm.Wnd.Canvas.TextWidth(Copy(lText, 1, n)) + lSideMargin;
if abs(cx - pEvent.Position.x) < abs(cpx - pEvent.Position.x) then
begin
cpx := cx;
cp := n;
end;
end;
FCursorPos := cp;
if (ssShift in pEvent.Shift) then
begin
FSelOffset := FCursorPos - FSelStart;
end
else
begin
FSelStart := cp;
FSelOffset := 0;
end;
end;
end;
{$ENDIF read_implementation}
|