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|
{
fpGUI - Free Pascal GUI Library
Copyright (C) 2006 - 2009 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
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.
Description:
A new Memo component. It's actually more a TextEdit or MulitLineEdit
component because it has a lot more features than simply a Memo. Features
include: gutter, line numbers in gutter, right edge margin, syntax
highlighting, much more optimised etc...
}
unit fpg_textedit;
{$mode objfpc}{$H+}
{$Define gDEBUG}
interface
uses
Classes, SysUtils, fpg_base, fpg_main, fpg_widget,
fpg_scrollbar;
type
// forward declaration
TfpgBaseTextEdit = class;
TfpgGutter = class(TfpgWidget)
private
FOwner: TfpgBaseTextEdit; // convenience reference variable
FDigits: Integer;
FShowNum: Boolean;
FSpace: Integer;
FStartNum: Integer;
FZeroStart: Boolean;
procedure SetDigits(const AValue: Integer);
procedure SetShowNum(const AValue: Boolean);
procedure SetSpace(const AValue: Integer);
procedure SetStartNum(const AValue: Integer);
procedure DrawLineNums;
procedure SetZeroStart(const AValue: Boolean);
protected
procedure HandlePaint; override;
procedure HandleMouseScroll(x, y: integer; shiftstate: TShiftState; delta: smallint); override;
public
constructor CreateGutter(AOwner: TfpgBaseTextEdit);
function GetClientRect: TfpgRect; override;
property LeadingDigits: Integer read FDigits write SetDigits default 0;
property ShowNum: Boolean read FShowNum write SetShowNum default True;
property Space: Integer read FSpace write SetSpace default 2;
property StartNum: Integer read FStartNum write SetStartNum default 1;
property Width default 35;
property ZeroStart: Boolean read FZeroStart write SetZeroStart default False;
end;
TfpgBaseTextEdit = class(TfpgWidget)
private
FFont: TfpgFont;
FFullRedraw: Boolean;
FLines: TStrings;
CaretPos: TPoint;
FScrollBarStyle: TfpgScrollStyle;
MousePos: TPoint;
FChrW: Integer;
FChrH: Integer;
FTopLine: Integer;
FVisLines: Integer;
FVisCols: Integer;
StartNo, EndNo, StartOffs, EndOffs: Integer;
FSelStartNo, FSelEndNo, FSelStartOffs, FSelEndOffs: Integer;
FTabWidth: Integer;
HPos, VPos, XSize, YSize: Integer;
FMaxScrollH: Integer;
FVScrollBar: TfpgScrollBar;
FHScrollBar: TfpgScrollBar;
FTracking: Boolean;
FSelDrag: Boolean;
FSelected, FSelMouseDwn: Boolean;
FGutterPan: TfpgGutter;
function GetFontDesc: string;
function GetGutterShowLineNumbers: Boolean;
function GetGutterVisible: Boolean;
function GetHScrollPos: Integer;
function GetVScrollPos: Integer;
procedure SetFontDesc(const AValue: string);
procedure SetGutterShowLineNumbers(const AValue: Boolean);
procedure SetGutterVisible(const AValue: Boolean);
procedure SetHScrollPos(const AValue: Integer);
procedure SetLines(const AValue: TStrings);
procedure SetScrollBarStyle(const AValue: TfpgScrollStyle);
procedure SetTabWidth(const AValue: Integer);
procedure SetVScrollPos(const AValue: Integer);
procedure UpdateCharBounds;
procedure GetSelBounds(var AStartNo, AEndNo, AStartOffs, AEndOffs: Integer);
procedure UpdateScrollBars;
procedure VScrollBarMove(Sender: TObject; position: integer);
procedure HScrollBarMove(Sender: TObject; position: integer);
procedure SetVPos(p: Integer);
procedure SetHPos(p: Integer);
procedure UpdateScrollBarCoords;
procedure UpdateGutterCoords;
procedure KeyboardCaretNav(const ShiftState: TShiftState; const AKeyCode: Word);
procedure InitMemoObjects;
protected
{ -- internal events -- }
procedure HandlePaint; override;
procedure HandleMouseEnter; override;
procedure HandleMouseExit; override;
procedure HandleLMouseDown(x, y: integer; shiftstate: TShiftState); override;
procedure HandleMouseScroll(x, y: integer; shiftstate: TShiftState; delta: smallint); override;
procedure HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
procedure HandleKeyChar(var AText: TfpgChar; var shiftstate: TShiftState; var consumed: boolean); override;
{ -- local widget functions -- }
procedure DrawVisible; virtual;
procedure DrawLine(const I, Y: Integer); virtual;
procedure FormatLine(const I, X, Y: Integer);
procedure DrawCaret(const X, Y: Integer); virtual;
{ -- to be published --}
property FontDesc: string read GetFontDesc write SetFontDesc;
property FullRedraw: Boolean read FFullRedraw write FFullRedraw default False;
property GutterVisible: Boolean read GetGutterVisible write SetGutterVisible default False;
property GutterShowLineNumbers: Boolean read GetGutterShowLineNumbers write SetGutterShowLineNumbers default True;
property Lines: TStrings read FLines write SetLines;
property ScrollBarStyle: TfpgScrollStyle read FScrollBarStyle write SetScrollBarStyle default ssAutoBoth;
property TabWidth: Integer read FTabWidth write SetTabWidth default 8;
property Tracking: Boolean read FTracking write FTracking default True;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function GetClientRect: TfpgRect; override;
function GetWordAtPos(const X, Y: Integer; out XBegin: Integer): TfpgString;
procedure GetRowColAtPos(const X, Y: Integer; out Row, Col: Integer);
procedure Clear;
procedure ScrollTo(X, Y: Integer);
procedure DeleteSelection;
procedure SaveToFile(const AFileName: TfpgString);
procedure LoadFromFile(const AFileName: TfpgString);
property ScrollPos_H: Integer read GetHScrollPos write SetHScrollPos;
property ScrollPos_V: Integer read GetVScrollPos write SetVScrollPos;
property TopLine: Integer read FTopLine;
property VisibleLines: Integer read FVisLines;
end;
TfpgTextEdit = class(TfpgBaseTextEdit)
published
property FontDesc;
property FullRedraw;
property GutterVisible;
property GutterShowLineNumbers;
property Lines;
property ScrollBarStyle;
property TabWidth;
property Tracking;
end;
implementation
uses
fpg_dialogs{, fpg_constants}, fpg_stringutils, fpg_utils;
{ TfpgGutter }
procedure TfpgGutter.SetDigits(const AValue: Integer);
begin
if FDigits=AValue then exit;
FDigits:=AValue;
end;
procedure TfpgGutter.SetShowNum(const AValue: Boolean);
begin
if FShowNum=AValue then exit;
FShowNum:=AValue;
Invalidate;
end;
procedure TfpgGutter.SetSpace(const AValue: Integer);
begin
if FSpace=AValue then exit;
FSpace:=AValue;
end;
procedure TfpgGutter.SetStartNum(const AValue: Integer);
begin
if FStartNum=AValue then exit;
FStartNum:=AValue;
end;
procedure TfpgGutter.DrawLineNums;
var
r: TfpgRect;
I, MaxI, W, H, ZeroL: Integer;
s: TfpgString;
ltxtflags: TFTextFlags;
begin
if not FShowNum then
Exit; //==>
w := GetClientRect.Width - FSpace - 1;
H := FOwner.FChrH;
MaxI := FOwner.FVisLines;
ltxtflags := [txtRight, txtVCenter];
Canvas.SetFont(FOwner.FFont);
r.SetRect(2, 0, W, H);
for i := 0 to MaxI do
begin
// writeln('i=', i);
if FZeroStart then
S := IntToStr(FStartNum + i - 1)
else
S := IntToStr(FStartNum + i);
for ZeroL := Length(S) to FDigits do
S := '0' + S;
r.Top := i * h;
Canvas.DrawText(r, S, ltxtflags);
end;
end;
procedure TfpgGutter.SetZeroStart(const AValue: Boolean);
begin
if FZeroStart=AValue then exit;
FZeroStart:=AValue;
end;
procedure TfpgGutter.HandlePaint;
begin
inherited HandlePaint;
Canvas.Clear(clWindowBackground);
// Gutter right border
Canvas.SetColor(clHilite2);
Canvas.DrawLine(Width - 2, 0, Width - 2, Height - 1);
Canvas.SetColor(clShadow1);
Canvas.DrawLine(Width - 1, 0, Width - 1, Height - 1);
DrawLineNums;
end;
procedure TfpgGutter.HandleMouseScroll(x, y: integer; shiftstate: TShiftState;
delta: smallint);
var
msg: TfpgMessageParams;
begin
inherited HandleMouseScroll(x, y, shiftstate, delta);
fillchar(msg, sizeof(msg), 0); // zero out the record - initialize it
msg.mouse.x := x;
msg.mouse.y := y;
msg.mouse.shiftstate := shiftstate;
msg.mouse.delta := delta;
fpgPostMessage(self, FOwner.FVScrollBar, FPGM_SCROLL, msg);
end;
constructor TfpgGutter.CreateGutter(AOwner: TfpgBaseTextEdit);
begin
inherited Create(AOwner);
FOwner := AOwner;
FDigits := 0;
FShowNum := True;
FSpace := 2;
FStartNum := 1;
FZeroStart := False;
Width := 35;
end;
function TfpgGutter.GetClientRect: TfpgRect;
begin
Result := inherited GetClientRect;
Result.Width := Result.Width - 2; // border right line takes up two pixels
end;
{ TfpgBaseTextEdit }
procedure TfpgBaseTextEdit.SetLines(const AValue: TStrings);
begin
FLines.Assign(AValue);
Invalidate;
end;
procedure TfpgBaseTextEdit.SetScrollBarStyle(const AValue: TfpgScrollStyle);
begin
if FScrollBarStyle = AValue then
Exit; //==>
FScrollBarStyle := AValue;
UpdateScrollBarCoords;
end;
function TfpgBaseTextEdit.GetFontDesc: string;
begin
Result := FFont.FontDesc;
end;
function TfpgBaseTextEdit.GetGutterShowLineNumbers: Boolean;
begin
Result := FGutterPan.ShowNum;
end;
function TfpgBaseTextEdit.GetGutterVisible: Boolean;
begin
Result := FGutterPan.Visible;
end;
function TfpgBaseTextEdit.GetHScrollPos: Integer;
begin
Result := HPos;
end;
function TfpgBaseTextEdit.GetVScrollPos: Integer;
begin
Result := VPos;
end;
procedure TfpgBaseTextEdit.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
Invalidate;
end;
procedure TfpgBaseTextEdit.SetGutterShowLineNumbers(const AValue: Boolean);
begin
FGutterPan.ShowNum := AValue;
end;
procedure TfpgBaseTextEdit.SetGutterVisible(const AValue: Boolean);
begin
FGutterPan.Visible := AValue;
Invalidate;
end;
procedure TfpgBaseTextEdit.SetHScrollPos(const AValue: Integer);
begin
SetHPos(AValue);
end;
procedure TfpgBaseTextEdit.SetTabWidth(const AValue: Integer);
begin
if AValue < 1 then
begin
{ todo: add these to resourcestring section }
if csDesigning in ComponentState then
TfpgMessageDialog.Information(ClassName + ' Tip', 'Value for TabWidth must be greater than 0.');
Exit; //==>
end;
FTabWidth := AValue;
end;
procedure TfpgBaseTextEdit.SetVScrollPos(const AValue: Integer);
begin
SetVPos(AValue);
end;
procedure TfpgBaseTextEdit.UpdateCharBounds;
begin
FChrW := FFont.TextWidth('W');
FChrH := FFont.Height;
FVisLines := (GetClientRect.Height div FChrH) + 1;
if FGutterPan.Visible then
FVisCols := (GetClientRect.Width - FGutterPan.Width) div FChrW
else
FVisCols := GetClientRect.Width div FChrW;
end;
procedure TfpgBaseTextEdit.GetSelBounds(var AStartNo, AEndNo, AStartOffs,
AEndOffs: Integer);
begin
if FSelStartNo <= FSelEndNo then
begin
AStartNo := FSelStartNo;
AEndNo := FSelEndNo;
if not ((AStartNo = AEndNo) and (FSelStartOffs > FSelEndOffs)) then
begin
AStartOffs := FSelStartOffs;
AEndOffs := FSelEndOffs;
end else
begin
AStartOffs := FSelEndOffs;
AEndOffs := FSelStartOffs;
end;
end else
begin
AStartNo := FSelEndNo;
AEndNo := FSelStartNo;
AStartOffs := FSelEndOffs;
AEndOffs := FSelStartOffs;
end;
end;
procedure TfpgBaseTextEdit.UpdateScrollBars;
begin
FVScrollBar.Min := 0;
FVScrollBar.PageSize := FVisLines - 2;
FVScrollBar.Max := FLines.Count +1 - FVisLines; // +1 is so the last line is completely visible
FVScrollBar.Position := VPos;
FVScrollBar.Visible := FLines.Count > FVisLines;
FHScrollBar.Min := 0;
FHScrollBar.PageSize := FVisCols div 4; //FMaxScrollH div 4;
FHScrollBar.Max := FMaxScrollH;// div 2;
FHScrollBar.Position := HPos;
FHScrollBar.Visible := FMaxScrollH > FVisCols;
UpdateScrollBarCoords;
end;
procedure TfpgBaseTextEdit.VScrollBarMove(Sender: TObject; position: integer);
begin
//if FDropList.Visible then
//FDropList.Visible := False;
//FDropTimeCount := 0;
//FLastDropPos.x := -1;
//FLastDropPos.y := -1;
if FTracking then
SetVPos(position);
//case ScrollCode of
//SB_LINEUP: SetVPos(VPos - 1);
//SB_LINEDOWN: SetVPos(VPos + 1);
//SB_PAGEUP: SetVPos(VPos - FVisLines);
//SB_PAGEDOWN: SetVPos(VPos + FVisLines);
//SB_THUMBPOSITION: SetVPos(Pos);
//SB_THUMBTRACK: if FTracking then SetVPos(Pos);
//SB_TOP: SetVPos(0);
//SB_BOTTOM: SetVPos(YSize);
//end;
end;
procedure TfpgBaseTextEdit.HScrollBarMove(Sender: TObject; position: integer);
begin
//if FDropList.Visible then
//FDropList.Visible := False;
//FDropTimeCount := 0;
//FLastDropPos.x := -1;
//FLastDropPos.y := -1;
if FTracking then
SetHPos(position);
//case ScrollCode of
//SB_LINERIGHT: SetHPos(HPos + 1);
//SB_LINELEFT: SetHPos(HPos - 1);
//SB_PAGEUP: SetHPos(HPos - FVisLines);
//SB_PAGEDOWN: SetHPos(HPos + FVisLines);
//SB_THUMBPOSITION: SetHPos(Pos);
//SB_THUMBTRACK: if FTracking then SetHPos(Pos);
//SB_TOP: SetHPos(0);
//SB_BOTTOM: SetHPos(XSize);
//end;
end;
procedure TfpgBaseTextEdit.SetVPos(p: Integer);
var
OldPos: Integer;
// R: TfpgRect;
begin
OldPos := VPos;
VPos := p;
UpdateScrollBars;
{$IFDEF gDEBUG}
writeln('OldPos:', OldPos, ' NewPos:', VPos, ' SB.Max:', FVScrollBar.Max);
{$ENDIF}
// FVScrollBar.Position := VPos;
// R := GetClientRect;
if OldPos - VPos <> 0 then
begin
{ todo: implement scrolling children }
// ScrollChildren(0, (OldPos - VPos) * FChrH);
FTopLine := VPos;
if FFullRedraw then
Invalidate
else
if (FTopLine + (FVisLines-1)) <= FLines.Count then
Invalidate;
{ TODO : Implement scrolling events }
//if Assigned(FOnScrolled_V) then
//FOnScrolled_V(Self);
//if Assigned(FOnTextScrolled) then
//FOnTextScrolled(Self, FTopLine, FTopLine + FVisLines + 1,HPos, FMaxScrollH);
end;
end;
procedure TfpgBaseTextEdit.SetHPos(p: Integer);
var
OldPos: Integer;
// R: TfpgRect;
begin
OldPos := HPos;
HPos := p;
UpdateScrollBars;
{$IFDEF gDEBUG}
writeln('OldPos:', OldPos, ' NewPos:', HPos, ' SB.Max:', FHScrollBar.Max);
{$ENDIF}
// R := GetClientRect;
if OldPos - HPos <> 0 then
begin
{ TODO : Implemente scrolling children }
// ScrollChildren((OldPos - HPos), 0);
//if FFullRedraw then
Invalidate;
//else
//DrawVisible;
{ TODO : Implement scrolling events }
//if Assigned(FOnScrolled_H) then
//FOnScrolled_H(Self);
//if Assigned(FOnTextScrolled) then
//FOnTextScrolled(Self, FTopLine, FTopLine + FVisLines, HPos, FMaxScrollH);
end;
end;
procedure TfpgBaseTextEdit.UpdateScrollBarCoords;
var
HWidth: integer;
VHeight: integer;
r: TfpgRect;
begin
r := GetClientRect;
VHeight := r.Height;
HWidth := r.Width;
//if FVScrollBar.Visible then
//Dec(HWidth, FVScrollBar.Width);
//if FHScrollBar.Visible then
//Dec(VHeight, FHScrollBar.Height);
FHScrollBar.Top := Height - FHScrollBar.Height - r.Top;
FHScrollBar.Left := r.Top;
FHScrollBar.Width := HWidth;
FVScrollBar.Top := r.Top;
FVScrollBar.Left := Width - FVScrollBar.Width - r.Top;
FVScrollBar.Height := VHeight;
FVScrollBar.UpdateWindowPosition;
FHScrollBar.UpdateWindowPosition;
end;
procedure TfpgBaseTextEdit.UpdateGutterCoords;
var
r: TfpgRect;
begin
r := GetClientRect;
if FGutterPan.Visible then
FGutterPan.SetPosition(r.Left, r.Top, FGutterPan.Width, r.Height);
end;
{ This procedure is used to set caret position on keyboard navigation and
to set selection if Shift key is pressed. }
procedure TfpgBaseTextEdit.KeyboardCaretNav(const ShiftState: TShiftState; const AKeyCode: Word);
procedure CtrlKeyLeftKey;
var
S: TfpgString;
XB: Integer;
begin
S := GetWordAtPos(CaretPos.X, CaretPos.Y, XB);
if (S <> '') and (XB > -1) then
begin
if FSelected then
FSelEndOffs := XB;
CaretPos.X := XB;
end
else
begin
if FSelected then
FSelEndOffs := 0;
CaretPos.X := 0;
end;
end;
begin
writeln('>> KeyboardCaretNav');
case AKeyCode of
keyLeft:
begin
CaretPos.X := CaretPos.X - 1;
if CaretPos.X < 0 then
begin
if CaretPos.Y > 0 then
begin
if CaretPos.Y <= pred(FLines.Count) then
begin
writeln('********');
//GliphY := (CaretPos.Y - FTopLine) * FChrH;
//DrawLine(Canvas, CaretPos.Y, GliphY);
//DrawCaret(CaretPos.X, CaretPos.Y + 1, False);
if (ssCtrl in ShiftState) and (CaretPos.Y > 0) then
begin
CaretPos.Y := CaretPos.Y - 1;
CaretPos.X := Length(FLines[CaretPos.Y]);
if FSelected then
begin
FSelEndNo := CaretPos.Y;
FSelEndOffs := CaretPos.X;
// DrawVisible;
end;
Exit;
end;
end;
CaretPos.Y := CaretPos.Y - 1;
CaretPos.X := Length(FLines[CaretPos.Y]);
//if not FSelected then
//begin
//GliphY := (CaretPos.Y - FTopLine) * FChrH;
//DrawLine(Canvas, CaretPos.X, GliphY);
//end else
//DrawVisible;
end
else
begin
CaretPos.X := 0;
//GliphY := (CaretPos.Y - FTopLine) * FChrH;
//if not FSelected then
//DrawLine(Canvas, CaretPos.Y, GliphY)
//else
//DrawVisible;
end;
end;
//else
//begin
//GliphY := (CaretPos.Y - FTopLine) * FChrH;
//DrawLine(Canvas, CaretPos.Y, GliphY);
//DrawCaret(CaretPos.X, CaretPos.Y, True);
//end;
if ssShift in ShiftState then
begin
if not FSelected then
begin
if CaretPos.Y <= pred(FLines.Count) then
if CaretPos.X > Length(FLines[CaretPos.Y]) then
CaretPos.Y := Length(FLines[CaretPos.Y]) - 1;
FSelected := True;
FSelStartNo := CaretPos.Y;
FSelStartOffs := CaretPos.X + 1;
FSelEndNo := CaretPos.Y;
if ssCtrl in ShiftState then
CtrlKeyLeftKey
else
FSelEndOffs := CaretPos.X;
end else
begin
FSelEndNo := CaretPos.Y;
if ssCtrl in ShiftState then
CtrlKeyLeftKey
else
FSelEndOffs := CaretPos.X;
if FSelEndNo <= pred(FLines.Count) then
begin
if FSelEndOffs > Length(FLines[FSelEndNo]) then
begin
FSelEndOffs := Length(FLines[FSelEndNo]) - 1;
CaretPos.X := FSelEndOffs;
end;
end else
begin
FSelEndOffs := 0;
CaretPos.X := 0;
end;
end;
FSelected := (FSelStartNo <> FSelEndNo) or (FSelStartOffs <> FSelEndOffs);
//DrawVisible;
Exit;
end;
if FSelected then
begin
FSelected := False;
//DrawVisible;
//DrawCaret(CaretPos.X, CaretPos.Y, True);
end;
if ssCtrl in ShiftState then
begin
CtrlKeyLeftKey;
//DrawVisible;
//DrawCaret(CaretPos.X, CaretPos.Y, True);
end;
FSelStartNo := CaretPos.Y;
FSelStartOffs := CaretPos.X;
end;
keyRight:
begin
end;
keyUp:
begin
end;
keyDown:
begin
end;
keyHome:
begin
end;
keyEnd:
begin
end;
keyPrior, keyNext:
begin
end;
end;
writeln('<< KeyboardCaretNav');
end;
procedure TfpgBaseTextEdit.InitMemoObjects;
begin
FGutterPan := TfpgGutter.CreateGutter(Self);
with FGutterPan do
begin
Left := -Width - 1;
Visible := False;
end;
end;
procedure TfpgBaseTextEdit.HandlePaint;
begin
// inherited HandlePaint;
UpdateCharBounds;
// normal house keeping
Canvas.ClearClipRect;
Canvas.Clear(clBoxColor);
fpgStyle.DrawControlFrame(Canvas, 0, 0, Width, Height);
Canvas.Font := FFont;
Canvas.SetClipRect(GetClientRect);
// do the actual drawing
UpdateScrollBarCoords;
UpdateGutterCoords;
DrawVisible;
DrawCaret(CaretPos.X, CaretPos.Y);
Canvas.ClearClipRect;
// The little square in the bottom right corner
if FHScrollBar.Visible and FVScrollBar.Visible then
begin
Canvas.SetColor(clButtonFace);
Canvas.FillRectangle(FHScrollBar.Left+FHScrollBar.Width,
FVScrollBar.Top+FVScrollBar.Height,
FVScrollBar.Width,
FHScrollBar.Height);
end;
end;
procedure TfpgBaseTextEdit.HandleMouseEnter;
begin
inherited HandleMouseEnter;
MouseCursor := mcIBeam;
end;
procedure TfpgBaseTextEdit.HandleMouseExit;
begin
inherited HandleMouseExit;
MouseCursor := mcDefault;
end;
procedure TfpgBaseTextEdit.HandleLMouseDown(x, y: integer; shiftstate: TShiftState);
var
RNo: Integer;
CNo: Integer;
begin
inherited HandleLMouseDown(x, y, shiftstate);
if FGutterPan.Visible and (X <= FGutterPan.Width) then Exit; //==>
GetRowColAtPos(X + HPos * FChrW, Y + VPos * FChrH, RNo, CNo);
CaretPos.X := CNo;
CaretPos.Y := RNo;
FSelDrag := False;
if (RNo in [FSelStartNo..FSelEndNo]) or (RNo in [FSelEndNo..FSelStartNo]) then
begin
if (FSelStartNo = FSelEndNo) and ((CNo in [FSelStartOffs..FSelEndOffs]) or
(CNo in [FSelEndOffs..FSelStartOffs])) then FSelDrag := True;
if FSelStartNo <> FSelEndNo then
begin
FSelDrag := True;
if (RNo = FSelStartNo) and (FSelStartNo < FSelEndNo) and (CNo < FSelStartOffs) then
FSelDrag := False;
if (RNo = FSelStartNo) and (FSelStartNo > FSelEndNo) and (CNo > FSelStartOffs) then
FSelDrag := False;
if (RNo = FSelEndNo) and (FSelStartNo < FSelEndNo) and (CNo > FSelStartOffs) then
FSelDrag := False;
if (RNo = FSelEndNo) and (FSelStartNo > FSelEndNo) and (CNo < FSelStartOffs) then
FSelDrag := False;
end;
end;
if FSelDrag then
begin
writeln(' SelDrag is True!!!!');
// Exit; //==>
end;
if not (ssShift in ShiftState) then
begin
writeln(' shiftstate not detected');
if FSelected then
begin
{ Erase old selection, if any... }
FSelected := False;
end;
FSelStartNo := RNo;
FSelEndNo := FSelStartNo;
FSelStartOffs := CNo;
FSelEndOffs := FSelStartOffs;
// FSelected := True;
FSelMouseDwn := True;
end
else
begin
FSelEndNo := RNo;
FSelEndOffs := CNo;
FSelected := True;
end;
Invalidate;
end;
procedure TfpgBaseTextEdit.HandleMouseScroll(x, y: integer; shiftstate: TShiftState;
delta: smallint);
var
msg: TfpgMessageParams;
begin
inherited HandleMouseScroll(x, y, shiftstate, delta);
fillchar(msg, sizeof(msg), 0); // zero out the record - initialize it
msg.mouse.x := x;
msg.mouse.y := y;
msg.mouse.shiftstate := shiftstate;
msg.mouse.delta := delta;
fpgPostMessage(self, FVScrollBar, FPGM_SCROLL, msg);
end;
procedure TfpgBaseTextEdit.HandleKeyPress(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
var
SLine: TfpgString;
AddS: TfpgString;
Y: Integer;
X: Integer;
CaretScroll: Boolean;
begin
writeln('>> TfpgBaseTextEdit.HandleKeyPress: keycode:', keycode);
writeln(' CaretPos X:', CaretPos.X, ' Y:', CaretPos.Y);
// inherited HandleKeyPress(keycode, shiftstate, consumed);
{ Add lines as we go, so we can cursor past EOF. }
{ todo: This behaviour should be optional }
if CaretPos.Y > pred(FLines.Count) then
begin
FLines.Add('');
Exit; //==>
end;
// if (keycode = keyEscape) or (ssCtrl in ShiftState) then
// Exit; //==>
if FSelected then
begin
DeleteSelection;
if keycode = keyBackSpace then
Exit; //==>
end;
SLine := FLines[CaretPos.Y];
case keycode of
keyBackspace:
begin
if UTF8Length(SLine) >= CaretPos.X then
X := CaretPos.X
else
begin
X := UTF8Length(SLine);
CaretPos.X := X;
end;
UTF8Delete(SLine, X, 1);
FLines[CaretPos.Y] := SLine;
CaretPos.X := CaretPos.X - 1;
if CaretPos.X < 0 then
begin
if CaretPos.Y > 0 then
begin
AddS := FLines[CaretPos.Y]; { store any text from current line }
FLines.Delete(CaretPos.Y);
CaretPos.Y := CaretPos.Y - 1;
CaretPos.X := UTF8Length(FLines[CaretPos.Y]); { reposition cursor }
if AddS <> '' then
FLines[CaretPos.Y] := FLines[CaretPos.Y] + AddS; { add stored text to new current line }
end
else
begin
CaretPos.X := 0;
end;
end;
FSelStartNo := CaretPos.Y;
FSelStartOffs := CaretPos.X;
end;
keyTab:
begin
end;
keyReturn:
begin
AddS := '';
if UTF8Length(SLine) > CaretPos.X then
begin
AddS := Copy(SLine, CaretPos.X + 1, Length(SLine) - CaretPos.X + 1);
Delete(SLine, CaretPos.X + 1, Length(SLine) - CaretPos.X);
FLines[CaretPos.Y] := SLine;
end;
if CaretPos.Y = pred(FLines.Count) then
FLines.Add(AddS)
else
if CaretPos.Y < pred(FLines.Count) then
FLines.Insert(CaretPos.Y + 1, AddS)
else
if CaretPos.Y > FLines.Count then
FLines.Add(''); { ??? }
CaretPos.Y := CaretPos.Y + 1;
CaretPos.X := 0;
FSelStartNo := CaretPos.Y;
FSelStartOffs := CaretPos.X;
end;
keyLeft, keyRight, keyUp, keyDown, keyHome, keyEnd, keyPrior, keyNext:
begin
KeyboardCaretNav(ShiftState, keycode);
CaretScroll := True;
end;
end;
if CaretPos.X > HPos + FVisCols then
ScrollPos_H := CaretPos.X - FVisCols
else if CaretPos.X < HPos then
ScrollPos_H := CaretPos.X;
if CaretPos.Y < FTopLine then
ScrollPos_V := CaretPos.Y
else if CaretPos.Y > FTopLine + FVisLines - 2 then
ScrollPos_V := CaretPos.Y - FVisLines + 2;
Invalidate;
writeln('<< TfpgBaseTextEdit.HandleKeyPress');
end;
procedure TfpgBaseTextEdit.HandleKeyChar(var AText: TfpgChar;
var shiftstate: TShiftState; var consumed: boolean);
var
SLine: TfpgString;
Fill: Integer;
begin
writeln('>> TfpgBaseTextEdit.HandleKeyChar');
if not consumed then
begin
// Handle only printable characters
// UTF-8 characters beyond ANSI range are supposed to be printable
if ((Ord(AText[1]) > 31) and (Ord(AText[1]) < 127)) or (Length(AText) > 1) then
begin
SLine := FLines[CaretPos.Y];
{ cursor was somewhere in whitespace, so we need to fill up the spaces }
if UTF8Length(SLine) < CaretPos.y + 1 then
for Fill := Length(SLine) to CaretPos.y + 1 do
SLine := SLine + ' ';
UTF8Insert(AText, SLine, CaretPos.X + 1);
FLines[CaretPos.Y] := SLine;
CaretPos.X := CaretPos.X + 1;
FSelStartNo := CaretPos.Y;
FSelStartOffs := CaretPos.X;
consumed := True;
end;
end;
if consumed then
RePaint
else
inherited HandleKeyChar(AText, shiftstate, consumed);
writeln('<< TfpgBaseTextEdit.HandleKeyChar');
end;
procedure TfpgBaseTextEdit.DrawVisible;
var
I, Y, cntVis: Integer;
begin
Y := 0;
cntVis := 1;
GetSelBounds(StartNo, EndNo, StartOffs, EndOffs);
for I := FTopLine to FTopLine + FVisLines do
begin
DrawLine(I, Y);
Y := Y + FChrH;
cntVis := cntVis + 1;
if cntVis > FVisLines then
Break; //==>
end;
{ todo: implement this }
{
if FRightEdge then
begin
if not FGutterOpt.Visible then
begin
with Canvas do
begin
Pen.Color := FEnvironment.RightEdgeColor;
MoveTo((FRightEdgeCol * FChrW) - (HPos * FChrW), 0);
LineTo((FRightEdgeCol * FChrW) - (HPos * FChrW), ClientHeight);
end;
end else
with Canvas do
begin
Pen.Color := FEnvironment.RightEdgeColor;
MoveTo((FRightEdgeCol * FChrW) - (HPos * FChrW) + FGutterPan.Width, 0);
LineTo((FRightEdgeCol * FChrW) - (HPos * FChrW) + FGutterPan.Width, ClientHeight);
end;
end;
}
end;
procedure TfpgBaseTextEdit.DrawLine(const I, Y: Integer);
var
X: Integer;
GSz: Integer;
begin
if FGutterPan.Visible then
begin
GSz := FGutterPan.Width + GetClientRect.Left + 1;
if FGutterPan.ShowNum and (FGutterPan.StartNum <> FTopLine + 1) then
begin
FGutterPan.StartNum := FTopLine + 1;
FGutterPan.Invalidate;
end;
end
else
GSz := GetClientRect.Left + 1; // gutter size if no gutter panel
if I < FLines.Count then
begin
X := -(HPos * FChrW) + GSz;
FormatLine(I, X, Y);
end;
end;
procedure TfpgBaseTextEdit.FormatLine(const I, X, Y: Integer);
var
S, CorrectS, SS: TfpgString;
TI, Si, Ei, T: Integer;
R: TfpgRect;
AllowDraw: Boolean;
begin
if FLines.Count = 0 then
Exit; //==>
if (I < 0) or (I > Pred(FLines.Count)) then
Exit; //==>
S := FLines[I];
if Pos(#9, S) > 0 then
begin
CorrectS := '';
for TI := 1 to Length(S) do // no need to use utf8 version here
begin
if S[TI] = #9 then
begin
for T := 1 to FTabWidth do
CorrectS := CorrectS + ' ';
end
else
CorrectS := CorrectS + S[TI];
end;
S := CorrectS;
end; { if }
{ start drawing formatted text }
R.SetRect(X, Y, UTF8Length(S) * FChrW, FChrH);
AllowDraw := True;
// if Assigned(FOnDrawLine) then FOnDrawLine(Self, S, I, LGliph, R, AllowDraw);
{ Draw simple text line... }
if AllowDraw then
Canvas.DrawText(R, S);
// DrawText(LGliph.Canvas.Handle, PChar(S), Length(S), R, DT_DRAWLINE);
{ todo: Do other formatting here. }
{ todo: Do selection painting here. }
if UTF8Length(S) > FMaxScrollH then
begin
FMaxScrollH := UTF8Length(S);
UpdateScrollBars;
end;
end;
procedure TfpgBaseTextEdit.DrawCaret(const X, Y: Integer);
var
Xp, Yp: Integer;
begin
if csDesigning in ComponentState then
Exit; //==>
{$IFDEF gDEBUG}
writeln('X:', X, ' Y:', Y, ' FTopLine:', FTopLine, ' HPos:', HPos, ' VPos:', VPos);
{$ENDIF}
if (Y < FTopLine) or (Y > FTopLine + FVisLines) then
begin
fpgCaret.UnSetCaret(Canvas);
Exit; //==>
end;
Yp := ((Y - FTopLine) * FChrH) + 1;
Xp := ((X - HPos) * FChrW) + GetClientRect.Left;
if FGutterPan.Visible then
Xp := Xp + FGutterPan.Width;
if (Xp < 0) or (Xp > GetClientRect.Width) then
begin
fpgCaret.UnSetCaret(Canvas);
Exit; //==>
end;
//with Canvas do
//begin
//if ShowCaret then
//begin
//Pen.Mode := pmNotMerge;
//Pen.Color := Font.Color;
//end else
//begin
//if not FSelected then
//Pen.Color := Self.Color
//else
//Pen.Color := FEnvironment.SelectionBackground;
//Pen.Mode := pmCopy;
//end;
//MoveTo(Xp, Yp);
//LineTo(Xp, Yp + FChrH);
//Pen.Mode := pmCopy;
//end;
if Focused then
fpgCaret.SetCaret(Canvas, Xp, Yp, fpgCaret.Width, FFont.Height)
else
fpgCaret.UnSetCaret(Canvas);
if not FSelected then
begin
FSelStartNo := CaretPos.x;
FSelStartOffs := CaretPos.y;
end;
end;
constructor TfpgBaseTextEdit.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
Focusable := True;
FFont := fpgGetFont('#Edit1');
Width := 320;
Height := 240;
FLines := TStringList.Create;
CaretPos.x := 0;
CaretPos.y := 0;
FTopLine := 0;
FTabWidth := 8;
FMaxScrollH := 0;
VPos := 0;
HPos := 0;
FTracking := True;
FFullRedraw := False;
FSelected := False;
FVScrollBar := TfpgScrollBar.Create(self);
FVScrollBar.Orientation := orVertical;
FVScrollBar.OnScroll := @VScrollBarMove;
FVScrollBar.Visible := False;
FHScrollBar := TfpgScrollBar.Create(self);
FHScrollBar.Orientation := orHorizontal;
FHScrollBar.OnScroll := @HScrollBarMove;
// FHScrollBar.ScrollStep := 5;
FHScrollBar.Visible := False;
InitMemoObjects;
end;
destructor TfpgBaseTextEdit.Destroy;
begin
FLines.Free;
FFont.Free;
inherited Destroy;
end;
function TfpgBaseTextEdit.GetClientRect: TfpgRect;
begin
// widget has a 2 pixel 3D border
Result.SetRect(2, 2, Width-4, Height-4);
if FVScrollBar.Visible then
Result.Width := Result.Width - FVScrollBar.Width;
if FHScrollBar.Visible then
Result.Height := Result.Height - FHScrollBar.Height;
end;
function TfpgBaseTextEdit.GetWordAtPos(const X, Y: Integer; out XBegin: Integer): TfpgString;
{ todo: This needs to be made UTF8 compliant! It currently is not. }
const
ValidChars = ['a'..'z', 'A'..'Z', '0'..'9', '#'];
var
S: TfpgString;
C: Char;
I, Si, Ei, CrX: Integer;
lX: integer;
begin
Result := '';
XBegin := -1;
Si := 0;
Ei := 0;
lX := X;
if Y > pred(FLines.Count) then Exit; //==>
S := FLines[Y];
if S = '' then Exit; //==>
if lX > UTF8Length(S) - 1 then
lX := UTF8Length(S) - 1;
if not (S[lX + 1] in ValidChars) then
begin
CrX := lX - 1;
for I := CrX downto 1 do
begin
C := S[I + 1];
if (C in ValidChars) then
begin
lX := I;
Break;
end;
end;
if lX = 0 then Exit; //==>
end;
for I := (lX + 1) downto 1 do
if S[I] in ValidChars then
Si := I
else
Break;
for I := (lX + 1) to Length(S) do
if S[I] in ValidChars then
Ei := I + 1
else
Break;
if Ei >= Si then
begin
Result := UTF8Copy(S, Si, Ei - Si);
XBegin := Si - 1;
end;
end;
procedure TfpgBaseTextEdit.GetRowColAtPos(const X, Y: Integer; out Row, Col: Integer);
var
Fine: Integer;
lX: Integer;
begin
Row := Y div FChrH;
if Row > Flines.Count then
Row := FLines.Count;
lX := X - GetClientRect.Left;
if FGutterPan.Visible then
begin
if lX < FGutterPan.Width then
lX := FGutterPan.Width;
Col := (lX - FGutterPan.Width) div FChrW;
Fine := (lX - FGutterPan.Width) mod FChrW;
end
else
begin
if lX < 0 then
lX := 0;
Col := lX div FChrW;
Fine := lX mod FChrW;
end;
if Fine > (FChrW div 2) - 1 then
Col := Col + 1;
end;
procedure TfpgBaseTextEdit.Clear;
begin
CaretPos.x := 0;
CaretPos.y := 0;
ScrollTo(0, 0);
FSelStartNo := 0;
FSelStartOffs := 0;
FSelEndNo := 0;
FSelEndOffs := 0;
FLines.Clear;
FSelected := False;
Invalidate;
end;
procedure TfpgBaseTextEdit.ScrollTo(X, Y: Integer);
begin
SetVPos(Y div FChrH);
SetHPos(X div FChrW);
end;
procedure TfpgBaseTextEdit.DeleteSelection;
begin
{ TODO : Implement DeleteSelection }
end;
procedure TfpgBaseTextEdit.SaveToFile(const AFileName: TfpgString);
var
BuffList: TStringList;
SLine: TfpgString;
I, P: Integer;
Replace: Boolean;
begin
BuffList := TStringList.Create;
try
BuffList.Assign(FLines);
for I := 0 to pred(BuffList.Count) do
begin
SLine := BuffList[I];
P := UTF8Length(SLine);
Replace := (P > 0) and (SLine <> '');
if Replace then
begin
while (fpgCharAt(SLine, P) = ' ') do
begin
UTF8Delete(SLine, P, 1);
P := UTF8Length(SLine);
end;
BuffList[I] := SLine;
end;
end;
BuffList.SaveToFile(AFileName);
finally
BuffList.Free;
end;
end;
procedure TfpgBaseTextEdit.LoadFromFile(const AFileName: TfpgString);
begin
if not fpgFileExists(AFileName) then
Exit; //==>
Clear;
FLines.LoadFromFile(AFileName);
Invalidate;
end;
end.
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