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vargrid.pas
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{*************************************************************************************
This file is part of Transmission Remote GUI.
Copyright (c) 2008-2010 by Yury Sidorov.
Transmission Remote GUI is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Transmission Remote GUI 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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Transmission Remote GUI; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*************************************************************************************}
unit VarGrid;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Grids, VarList, Graphics, Controls, LMessages, Forms, StdCtrls;
type
TVarGrid = class;
TCellOption = (coDrawCheckBox, coDrawTreeButton);
TCellOptions = set of TCellOption;
TCellAttributes = record
Text: string;
ImageIndex: integer;
Indent: integer;
Options: TCellOptions;
State: TCheckBoxState;
Expanded: boolean;
end;
TOnCellAttributes = procedure (Sender: TVarGrid; ACol, ARow, ADataCol: integer; AState: TGridDrawState; var CellAttribs: TCellAttributes) of object;
TOnDrawCellEvent = procedure (Sender: TVarGrid; ACol, ARow, ADataCol: integer; AState: TGridDrawState; const R: TRect; var ADefaultDrawing: boolean) of object;
TOnSortColumnEvent = procedure (Sender: TVarGrid; var ASortCol: integer) of object;
TCellNotifyEvent = procedure (Sender: TVarGrid; ACol, ARow, ADataCol: integer) of object;
{ TVarGrid }
TVarGrid = class(TCustomDrawGrid)
private
FFirstVisibleColumn: integer;
FHideSelection: boolean;
FImages: TImageList;
FItems: TVarList;
FItemsChanging: boolean;
FColumnsMap: array of integer;
FMultiSelect: boolean;
FOnCellAttributes: TOnCellAttributes;
FOnCheckBoxClick: TCellNotifyEvent;
FOnDrawCell: TOnDrawCellEvent;
FOnTreeButtonClick: TCellNotifyEvent;
FSelCount: integer;
FAnchor: integer;
FSortColumn: integer;
FOnSortColumn: TOnSortColumnEvent;
FRow: integer;
FHintCell: TPoint;
function GetRow: integer;
function GetRowSelected(RowIndex: integer): boolean;
function GetRowVisible(RowIndex: integer): boolean;
function GetSortOrder: TSortOrder;
procedure ItemsChanged(Sender: TObject);
procedure SetHideSelection(const AValue: boolean);
procedure SetRow(const AValue: integer);
procedure SetRowSelected(RowIndex: integer; const AValue: boolean);
procedure SetRowVisible(RowIndex: integer; const AValue: boolean);
procedure SetSortColumn(const AValue: integer);
procedure SetSortOrder(const AValue: TSortOrder);
procedure UpdateColumnsMap;
procedure UpdateSelCount;
procedure SelectRange(OldRow, NewRow: integer);
procedure CMHintShow(var Message: TCMHintShow); message CM_HINTSHOW;
function CellNeedsCheckboxBitmaps(const aCol,aRow: Integer): boolean;
procedure DrawCellCheckboxBitmaps(const aCol,aRow: Integer; const aRect: TRect);
protected
procedure SizeChanged(OldColCount, OldRowCount: Integer); override;
procedure DrawCell(aCol,aRow: Integer; aRect: TRect; aState:TGridDrawState); override;
procedure ColRowMoved(IsColumn: Boolean; FromIndex,ToIndex: Integer); override;
procedure PrepareCanvas(aCol,aRow: Integer; aState:TGridDrawState); override;
procedure MouseDown(Button: TMouseButton; Shift:TShiftState; X,Y:Integer); override;
procedure MouseMove(Shift: TShiftState; X,Y: Integer);override;
procedure KeyDown(var Key : Word; Shift : TShiftState); override;
procedure DoOnCellAttributes(ACol, ARow, ADataCol: integer; AState: TGridDrawState; var CellAttribs: TCellAttributes);
procedure HeaderClick(IsColumn: Boolean; index: Integer); override;
procedure AutoAdjustColumn(aCol: Integer); override;
procedure VisualChange; override;
procedure DrawColumnText(aCol,aRow: Integer; aRect: TRect; aState:TGridDrawState); override;
procedure DblClick; override;
procedure Click; override;
procedure GetCheckBoxState(const aCol, aRow:Integer; var aState:TCheckboxState); override;
procedure SetCheckboxState(const aCol, aRow:Integer; const aState: TCheckboxState); override;
procedure SetupCell(ACol, ARow: integer; AState: TGridDrawState; out CellAttribs: TCellAttributes);
procedure DoOnCheckBoxClick(ACol, ARow: integer);
procedure DoOnTreeButtonClick(ACol, ARow: integer);
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure RemoveSelection;
procedure SelectAll;
procedure Sort; reintroduce;
function ColToDataCol(ACol: integer): integer;
procedure BeginUpdate; reintroduce;
procedure EndUpdate(aRefresh: boolean = true); reintroduce;
property Items: TVarList read FItems;
property RowSelected[RowIndex: integer]: boolean read GetRowSelected write SetRowSelected;
property RowVisible[RowIndex: integer]: boolean read GetRowVisible write SetRowVisible;
property SelCount: integer read FSelCount;
property Row: integer read GetRow write SetRow;
property FirstVisibleColumn: integer read FFirstVisibleColumn;
published
property Align;
property AlternateColor;
property Anchors;
property BorderSpacing;
property BorderStyle;
property Color;
property Columns;
property Constraints;
property DragCursor;
property DragKind;
property DragMode;
property Enabled;
property FixedCols;
property FixedRows;
property Font;
property GridLineWidth;
property Options;
property ParentColor default false;
property ParentFont;
property ParentShowHint default false;
property PopupMenu;
property RowCount;
property ScrollBars;
property ShowHint default True;
property TabOrder;
property TabStop;
property TitleFont;
property TitleImageList;
property TitleStyle default tsNative;
property Visible;
property OnClick;
property OnDblClick;
property OnEnter;
property OnExit;
property OnHeaderClick;
property OnHeaderSized;
property OnKeyDown;
property OnKeyPress;
property OnKeyUp;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnMouseWheelDown;
property OnMouseWheelUp;
property OnContextPopup;
property OnDragDrop;
property OnDragOver;
property OnEndDock;
property OnEndDrag;
property OnStartDock;
property OnStartDrag;
property OnUTF8KeyPress;
property OnResize;
property Images: TImageList read FImages write FImages;
property MultiSelect: boolean read FMultiSelect write FMultiSelect default False;
property SortColumn: integer read FSortColumn write SetSortColumn default -1;
property SortOrder: TSortOrder read GetSortOrder write SetSortOrder default soAscending;
property HideSelection: boolean read FHideSelection write SetHideSelection default False;
property OnCellAttributes: TOnCellAttributes read FOnCellAttributes write FOnCellAttributes;
property OnDrawCell: TOnDrawCellEvent read FOnDrawCell write FOnDrawCell;
property OnSortColumn: TOnSortColumnEvent read FOnSortColumn write FOnSortColumn;
property OnCheckBoxClick: TCellNotifyEvent read FOnCheckBoxClick write FOnCheckBoxClick;
property OnTreeButtonClick: TCellNotifyEvent read FOnTreeButtonClick write FOnTreeButtonClick;
end;
procedure Register;
implementation
uses Variants, LCLType, Math, GraphType, lclintf, Themes, types
{$ifdef LCLcarbon} , carbonproc {$endif LCLcarbon};
const
roSelected = 1;
roCurRow = 2;
procedure Register;
begin
RegisterComponents('TransGUI', [TVarGrid]);
end;
{ TVarGrid }
procedure TVarGrid.ItemsChanged(Sender: TObject);
var
i, OldRows, OldCols: integer;
pt: TPoint;
begin
FItemsChanging:=True;
try
Perform(CM_MouseLeave, 0, 0); // Hack to call ResetHotCell to workaround a bug
OldRows:=RowCount;
OldCols:=Columns.Count;
RowCount:=FItems.RowCnt + FixedRows;
if FRow <> -1 then begin
Row:=FRow;
FRow:=-1;
end;
UpdateSelCount;
while Columns.Count > FItems.ColCnt do
Columns.Delete(Columns.Count - 1);
if Columns.Count <> FItems.ColCnt then begin
Columns.BeginUpdate;
try
for i:=Columns.Count to FItems.ColCnt - 1 do
Columns.Add;
finally
Columns.EndUpdate;
end;
end;
if (OldRows <> RowCount) or (OldCols <> Columns.Count) then begin
if Parent <> nil then
HandleNeeded;
ResetSizes;
end
else
Invalidate;
pt:=ScreenToClient(Mouse.CursorPos);
if PtInRect(ClientRect, pt) then
MouseMove([], pt.x, pt.y);
finally
FItemsChanging:=False;
end;
end;
procedure TVarGrid.SetHideSelection(const AValue: boolean);
begin
if FHideSelection=AValue then exit;
FHideSelection:=AValue;
Invalidate;
end;
procedure TVarGrid.SetRow(const AValue: integer);
var
i: integer;
begin
if FItems.IsUpdating then
FRow:=AValue
else begin
i:=LeftCol;
inherited Row:=AValue + FixedRows;
LeftCol:=i;
end;
end;
function TVarGrid.GetRowSelected(RowIndex: integer): boolean;
begin
Result:=LongBool(FItems.RowOptions[RowIndex] and roSelected);
end;
function TVarGrid.GetRowVisible(RowIndex: integer): boolean;
begin
Result:=RowHeights[RowIndex + FixedRows] > 0;
end;
function TVarGrid.GetSortOrder: TSortOrder;
begin
Result:=inherited SortOrder;
end;
function TVarGrid.GetRow: integer;
begin
if FItems.IsUpdating and (FRow <> -1) then
Result:=FRow
else begin
Result:=inherited Row - FixedRows;
end;
end;
procedure TVarGrid.SetRowSelected(RowIndex: integer; const AValue: boolean);
var
i, j: integer;
begin
i:=FItems.RowOptions[RowIndex];
if AValue then begin
j:=i or roSelected;
if j <> i then
Inc(FSelCount);
end
else begin
j:=i and not roSelected;
if j <> i then
Dec(FSelCount);
end;
FItems.RowOptions[RowIndex]:=j;
InvalidateRow(RowIndex + FixedRows);
if FSelCount <= 1 then
InvalidateRow(inherited Row);
end;
procedure TVarGrid.SetRowVisible(RowIndex: integer; const AValue: boolean);
begin
if AValue then
RowHeights[RowIndex + FixedRows]:=DefaultRowHeight
else
RowHeights[RowIndex + FixedRows]:=0;
end;
procedure TVarGrid.SetSortColumn(const AValue: integer);
begin
if FSortColumn=AValue then exit;
FSortColumn:=AValue;
if FSortColumn >= 0 then
Options:=Options + [goHeaderPushedLook, goHeaderHotTracking]
else
Options:=Options - [goHeaderPushedLook, goHeaderHotTracking];
Sort;
end;
procedure TVarGrid.SetSortOrder(const AValue: TSortOrder);
begin
if SortOrder = AValue then exit;
inherited SortOrder:=AValue;
Sort;
end;
procedure TVarGrid.UpdateColumnsMap;
var
i, j: integer;
begin
FFirstVisibleColumn:=-1;
SetLength(FColumnsMap, Columns.Count);
j:=0;
for i:=0 to Columns.Count - 1 do
with Columns[i] do begin
if (FFirstVisibleColumn < 0) and Visible then
FFirstVisibleColumn:=i;
FColumnsMap[j]:=ID - 1;
Inc(j);
end;
SetLength(FColumnsMap, j);
end;
procedure TVarGrid.UpdateSelCount;
var
i: integer;
begin
FSelCount:=0;
for i:=0 to FItems.Count - 1 do
if RowSelected[i] then
Inc(FSelCount);
end;
procedure TVarGrid.SelectRange(OldRow, NewRow: integer);
var
dir: integer;
sel: boolean;
begin
if OldRow = NewRow then
exit;
if FAnchor = -1 then
FAnchor:=OldRow;
dir:=Sign(NewRow - OldRow);
if Sign(FAnchor - OldRow) <> Sign(FAnchor - NewRow) then
while OldRow <> FAnchor do begin
RowSelected[OldRow]:=False;
Inc(OldRow, dir);
end;
sel:=Abs(FAnchor - OldRow) < Abs(FAnchor - NewRow);
while OldRow <> NewRow do begin
RowSelected[OldRow]:=sel;
Inc(OldRow, dir);
end;
RowSelected[NewRow]:=True;
end;
procedure TVarGrid.CMHintShow(var Message: TCMHintShow);
var
ca: TCellAttributes;
pt: TPoint;
wd: integer;
R: TRect;
begin
with Message.HintInfo^ do begin
pt:=MouseToCell(CursorPos);
if (pt.x >= FixedCols) and (pt.y >= 0) then begin
R:=CellRect(pt.x, pt.y);
if PtInRect(R, CursorPos) then begin
SetupCell(pt.x, pt.y, [], ca);
if ca.Text <> '' then begin
wd:=Canvas.TextWidth(ca.Text);
Inc(R.Left, ca.Indent);
if coDrawTreeButton in ca.Options then
Inc(R.Left, R.Bottom - R.Top);
if coDrawCheckBox in ca.Options then
Inc(R.Left, R.Bottom - R.Top);
if (ca.ImageIndex <> -1) and Assigned(FImages) then
Inc(R.Left, FImages.Width + 2);
if (R.Right <= R.Left) or (R.Right - R.Left < wd + 5) then begin
HintStr:=ca.Text;
R.Top:=(R.Top + R.Bottom - Canvas.TextHeight(ca.Text)) div 2 - 4;
Dec(R.Left);
HintPos:=ClientToScreen(R.TopLeft);
end;
FHintCell:=pt;
end
else
Message.Result:=1;
end
else
Message.Result:=1;
end;
end;
end;
function TVarGrid.CellNeedsCheckboxBitmaps(const aCol, aRow: Integer): boolean;
var
C: TGridColumn;
begin
Result := false;
if (aRow>=FixedRows) and Columns.Enabled then begin
C := ColumnFromGridColumn(aCol);
result := (C<>nil) and (C.ButtonStyle=cbsCheckboxColumn)
end;
end;
procedure TVarGrid.DrawCellCheckboxBitmaps(const aCol, aRow: Integer; const aRect: TRect);
var
AState: TCheckboxState;
begin
AState := cbUnchecked;
GetCheckBoxState(aCol, aRow, aState);
DrawGridCheckboxBitmaps(aCol, aRow, aRect, aState);
end;
procedure TVarGrid.SizeChanged(OldColCount, OldRowCount: Integer);
begin
if not FItemsChanging and (FItems <> nil) then begin
FItems.ColCnt:=Columns.Count;
FItems.RowCnt:=RowCount - FixedRows;
UpdateColumnsMap;
end;
inherited;
end;
procedure TVarGrid.DrawCell(aCol, aRow: Integer; aRect: TRect; aState: TGridDrawState);
var
ca: TCellAttributes;
ts: TTextStyle;
dd, IsHeader: boolean;
R: TRect;
det: TThemedElementDetails;
sz: TSize;
i: integer;
begin
if RowHeights[aRow] = 0 then
exit;
IsHeader:=(gdFixed in aState) and (aRow=0) and (aCol>=FirstGridColumn);
if not IsHeader and MultiSelect and (FSelCount > 0) then
if (aRow >= FixedRows) and (aCol >= FixedCols) and RowSelected[aRow - FixedRows] then
Include(aState, gdSelected)
else
Exclude(aState, gdSelected);
PrepareCanvas(aCol, aRow, aState);
if DefaultDrawing then
SetupCell(aCol, aRow, aState, ca);
if not IsHeader or (TitleStyle<>tsNative) then
Canvas.FillRect(aRect);
if not IsHeader then begin
dd:=True;
if Assigned(FOnDrawCell) then begin
R:=CellRect(aCol, aRow);
if goVertLine in Options then
Dec(R.Right, 1);
if goHorzLine in Options then
Dec(R.Bottom, 1);
FOnDrawCell(Self, aCol, aRow - FixedRows, ColToDataCol(aCol), aState, R, dd);
end;
if DefaultDrawing and dd then begin
if CellNeedsCheckboxBitmaps(aCol,aRow) then
DrawCellCheckboxBitmaps(aCol,aRow,aRect)
else begin
Inc(aRect.Left, ca.Indent);
if coDrawTreeButton in ca.Options then begin
R:=aRect;
R.Right:=R.Left + (R.Bottom - R.Top);
aRect.Left:=R.Right;
if ThemeServices.ThemesEnabled then begin
if ca.Expanded then
det:=ThemeServices.GetElementDetails(ttGlyphOpened)
else
det:=ThemeServices.GetElementDetails(ttGlyphClosed);
sz:=ThemeServices.GetDetailSize(det);
with R do begin
Left:=(Left + Right - sz.cx) div 2;
Top:=(Top + Bottom - sz.cy) div 2;
R:=Bounds(Left, Top, sz.cx, sz.cy);
end;
ThemeServices.DrawElement(Canvas.Handle, det, R, nil);
end
else
with Canvas do begin
i:=(R.Bottom - R.Top) div 4;
InflateRect(R, -i, -i);
if (R.Right - R.Left) and 1 = 0 then
Dec(R.Right);
if (R.Bottom - R.Top) and 1 = 0 then
Dec(R.Bottom);
Pen.Color:=clWindowText;
Rectangle(R);
InflateRect(R, -1, -1);
Brush.Color:=clWindow;
FillRect(R);
InflateRect(R, -1, -1);
i:=(R.Top + R.Bottom) div 2;
MoveTo(R.Left, i);
LineTo(R.Right, i);
if not ca.Expanded then begin
i:=(R.Left + R.Right) div 2;
MoveTo(i, R.Top);
LineTo(i, R.Bottom);
end;
end;
end;
if coDrawCheckBox in ca.Options then begin
R:=aRect;
R.Right:=R.Left + (R.Bottom - R.Top);
aRect.Left:=R.Right;
DrawGridCheckboxBitmaps(aCol, aRow, R, ca.State);
end;
if (ca.ImageIndex <> -1) and Assigned(FImages) then begin
FImages.Draw(Canvas, aRect.Left + 2, (aRect.Bottom + aRect.Top - FImages.Height) div 2, ca.ImageIndex, gdeNormal);
Inc(aRect.Left, FImages.Width + 2);
end;
if (Canvas.TextStyle.Alignment <> taLeftJustify) and (ca.Text <> '') then
if (aRect.Right <= aRect.Left) or (aRect.Right - aRect.Left < Canvas.TextWidth(ca.Text) + 9) then begin
ts:=Canvas.TextStyle;
ts.Alignment:=taLeftJustify;
Canvas.TextStyle:=ts;
end;
DrawCellText(aCol, aRow, aRect, aState, ca.Text);
end;
end;
end;
if gdFixed in aState then
DefaultDrawCell(aCol, aRow, aRect, aState)
else
DrawCellGrid(aCol,aRow,aRect,aState);
end;
procedure TVarGrid.ColRowMoved(IsColumn: Boolean; FromIndex, ToIndex: Integer);
begin
inherited ColRowMoved(IsColumn, FromIndex, ToIndex);
UpdateColumnsMap;
end;
procedure TVarGrid.PrepareCanvas(aCol, aRow: Integer; aState: TGridDrawState);
var
F: TCustomForm;
begin
F:=GetParentForm(Self);
if FHideSelection and (FSelCount = 0) and (F <> nil) and (F.ActiveControl <> Self) then
aState:=aState - [gdSelected];
inherited PrepareCanvas(aCol, aRow, aState);
with Canvas do
if (Font.Color = clWindow) and (Brush.Color = clHighlight) then begin
Font.Color:=clHighlightText;
{$ifdef LCLgtk2}
Brush.Color:=ColorToRGB(Brush.Color); // Workaround for LCL bug
{$endif LCLgtk2}
end;
end;
procedure TVarGrid.MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
pt: TPoint;
IsCtrl, CheckBoxClicked: boolean;
ca: TCellAttributes;
R, RR: TRect;
begin
{$ifdef LCLcarbon}
IsCtrl:=ssMeta in GetCarbonShiftState;
{$else}
IsCtrl:=ssCtrl in Shift;
{$endif LCLcarbon}
CheckBoxClicked:=False;
pt:=MouseToCell(Point(X,Y));
if ssLeft in Shift then begin
SetupCell(pt.x, pt.y, [], ca);
RR:=CellRect(pt.x, pt.y);
Inc(RR.Left, ca.Indent);
if (RR.Left <= RR.Right) and (coDrawTreeButton in ca.Options) then begin
R:=RR;
R.Right:=R.Left + (R.Bottom - R.Top);
if R.Right > RR.Right then
R.Right:=RR.Right;
if PtInRect(R, Point(X,Y)) then begin
DoOnTreeButtonClick(pt.x, pt.y);
InvalidateCell(pt.x, pt.y);
end;
Inc(RR.Left, RR.Bottom - RR.Top);
end;
if (RR.Left <= RR.Right) and (coDrawCheckBox in ca.Options) then begin
R:=RR;
R.Right:=R.Left + (R.Bottom - R.Top);
if R.Right > RR.Right then
R.Right:=RR.Right;
if PtInRect(R, Point(X,Y)) then begin
DoOnCheckBoxClick(pt.x, pt.y);
InvalidateCell(pt.x, pt.y);
CheckBoxClicked:=True;
end;
end;
end;
if (ssRight in Shift) {$ifdef darwin} or (Shift*[ssLeft, ssCtrl] = [ssLeft, ssCtrl]) {$endif} then begin
SetFocus;
if (pt.x >= FixedCols) and (pt.y >= FixedRows) then begin
if MultiSelect and (SelCount > 0) and not RowSelected[pt.y - FixedRows] then
RemoveSelection;
Row:=pt.y - FixedRows;
end;
end
else
if MultiSelect and (ssLeft in Shift) and (pt.x >= FixedCols) and (pt.y >= FixedRows) then begin
if IsCtrl then begin
if SelCount = 0 then
RowSelected[Row]:=True;
RowSelected[pt.y - FixedRows]:=not RowSelected[pt.y - FixedRows];
FAnchor:=-1;
end
else
if ssShift in Shift then
SelectRange(Row, pt.y - FixedRows)
else begin
if (SelCount > 0) and not CheckBoxClicked then
RemoveSelection;
FAnchor:=-1;
end;
end;
inherited MouseDown(Button, Shift, X, Y);
end;
procedure TVarGrid.MouseMove(Shift: TShiftState; X, Y: Integer);
var
pt: TPoint;
begin
NullStrictConvert := False;
inherited MouseMove(Shift, X, Y);
pt:=MouseToCell(Point(x, y));
if (FHintCell.x <> -1) and ((FHintCell.x <> pt.x) or (FHintCell.y <> pt.y)) then begin
Application.CancelHint;
FHintCell.x:=-1;
end;
end;
procedure TVarGrid.KeyDown(var Key: Word; Shift: TShiftState);
var
r, k: integer;
ca: TCellAttributes;
begin
r:=Row;
k:=Key;
if (Shift = []) and ( (k = VK_SPACE) or (k = VK_LEFT) or (k = VK_RIGHT) or (k = VK_ADD) or (k = VK_SUBTRACT) ) then begin
SetupCell(FixedCols, inherited Row, [], ca);
case k of
VK_SPACE:
if coDrawCheckBox in ca.Options then begin
DoOnCheckBoxClick(FixedCols, inherited Row);
exit;
end;
VK_LEFT, VK_SUBTRACT:
if (coDrawTreeButton in ca.Options) and ca.Expanded then begin
DoOnTreeButtonClick(FixedCols, inherited Row);
exit;
end;
VK_RIGHT, VK_ADD:
if (coDrawTreeButton in ca.Options) and not ca.Expanded then begin
DoOnTreeButtonClick(FixedCols, inherited Row);
exit;
end;
end;
end;
inherited KeyDown(Key, Shift);
if MultiSelect then begin
if ssCtrl in Shift then begin
if k = VK_SPACE then
RowSelected[Row]:=not RowSelected[Row];
FAnchor:=-1;
end
else
if ssShift in Shift then begin
SelectRange(r, Row);
end
else
if k in [VK_LEFT, VK_RIGHT, VK_UP, VK_DOWN, VK_HOME, VK_END, VK_NEXT, VK_PRIOR] then begin
if SelCount > 0 then
RemoveSelection;
FAnchor:=-1;
end;
end;
if (Key = VK_RETURN) and Assigned(OnDblClick) then
OnDblClick(Self);
end;
procedure TVarGrid.DoOnCellAttributes(ACol, ARow, ADataCol: integer; AState: TGridDrawState; var CellAttribs: TCellAttributes);
begin
if Assigned(FOnCellAttributes) then
FOnCellAttributes(Self, ACol, ARow, ADataCol, AState, CellAttribs);
end;
procedure TVarGrid.HeaderClick(IsColumn: Boolean; index: Integer);
var
i: integer;
begin
inherited HeaderClick(IsColumn, index);
if IsColumn and (FSortColumn >= 0) then begin
i:=ColToDataCol(index);
if FSortColumn = i then begin
if SortOrder = soAscending then
SortOrder:=soDescending
else
SortOrder:=soAscending;
end
else begin
SortOrder:=soAscending;
SortColumn:=i;
end;
end;
end;
procedure TVarGrid.AutoAdjustColumn(aCol: Integer);
var
i, j, wd, h, fr: integer;
ca: TCellAttributes;
begin
wd:=4;
fr:=FixedRows;
for i:=0 to FItems.Count - 1 do begin
h:=RowHeights[i + fr];
if h > 0 then begin
SetupCell(aCol, i + fr, [], ca);
j:=Canvas.TextWidth(ca.Text) + 6;
Inc(j, ca.Indent);
if coDrawTreeButton in ca.Options then
Inc(j, h);
if coDrawCheckBox in ca.Options then
Inc(j, h);
if (ca.ImageIndex <> -1) and Assigned(FImages) then
Inc(j, FImages.Width + 2);
if j > wd then
wd:=j;
end;
end;
ColumnFromGridColumn(aCol).Width:=wd;
end;
procedure TVarGrid.VisualChange;
begin
inherited VisualChange;
if HandleAllocated then
DefaultRowHeight:=Canvas.TextHeight('Xy') + 5;
UpdateColumnsMap;
end;
procedure TVarGrid.DrawColumnText(aCol, aRow: Integer; aRect: TRect; aState: TGridDrawState);
var
R: TRect;
i: integer;
begin
if (gdFixed in aState) and (aRow=0) and (aCol>=FirstGridColumn) then begin
R:=aRect;
if FSortColumn = ColToDataCol(aCol) then begin
R.Right:=R.Left + R.Bottom - R.Top;
InflateRect(R, -5, -5);
OffsetRect(R, -3, 0);
Dec(R.Bottom, 2);
aRect.Left:=R.Right + 2;
end;
inherited DrawColumnText(aCol, aRow, aRect, aState);
if FSortColumn = ColToDataCol(aCol) then
with Canvas do begin
Pen.Color:=clGrayText;
i:=(R.Left + R.Right) div 2;
if SortOrder = soAscending then begin
MoveTo(i, R.Top);
LineTo(R.Right, R.Bottom);
LineTo(R.Left, R.Bottom);
LineTo(i, R.Top);
end
else begin
MoveTo(R.TopLeft);
LineTo(R.Right, R.Top);
LineTo(i, R.Bottom);
LineTo(R.TopLeft);
end;
end;
end;
end;
procedure TVarGrid.DblClick;
var
pt: TPoint;
begin
pt:=MouseToCell(ScreenToClient(Mouse.CursorPos));
if (pt.y < FixedRows) and (pt.y = 0) and (Cursor <> crHSplit) then
exit;
inherited DblClick;
end;
procedure TVarGrid.Click;
begin
if Assigned(OnClick) then
OnClick(Self);
end;
procedure TVarGrid.GetCheckBoxState(const aCol, aRow: Integer; var aState: TCheckboxState);
var
s: string;
begin
if (aCol >= FixedCols) and (aRow >= FixedRows) then begin
s:=Items[ColToDataCol(aCol), aRow - FixedRows];
with Columns[GridColumnFromColumnIndex(aCol)] do
if s = ValueChecked then
aState:=cbChecked
else
if s = ValueUnchecked then
aState:=cbUnchecked
else
aState:=cbGrayed;
end;
inherited GetCheckBoxState(aCol, aRow, aState);
end;
procedure TVarGrid.SetCheckboxState(const aCol, aRow: Integer; const aState: TCheckboxState);
var
s: string;
begin
if (aCol >= FixedCols) and (aRow >= FixedRows) then begin
with Columns[GridColumnFromColumnIndex(aCol)] do
case aState of
cbUnchecked:
s:=ValueUnchecked;
cbChecked:
s:=ValueChecked;
else
s:='?';
end;
Items[ColToDataCol(aCol), aRow - FixedRows]:=s;
end;
inherited SetCheckboxState(aCol, aRow, aState);
end;
procedure TVarGrid.SetupCell(ACol, ARow: integer; AState: TGridDrawState; out CellAttribs: TCellAttributes);
var
v: variant;
dc: integer;
begin
if (ACol < 0) or (ARow < 0) then
exit;
CellAttribs.ImageIndex:=-1;
CellAttribs.Indent:=0;
CellAttribs.Options:=[];
CellAttribs.State:=cbUnchecked;
CellAttribs.Expanded:=True;
if ACol >= FixedCols then begin
dc:=ColToDataCol(ACol);
if ARow >= FixedRows then begin
v:=Items[dc, ARow - FixedRows];
if not VarIsNull(v) and not VarIsEmpty(v) then
CellAttribs.Text:=UTF8Encode(WideString(v))
else
CellAttribs.Text:='';
end
else
CellAttribs.Text:=ColumnFromGridColumn(ACol).Title.Caption;
end
else
dc:=-1;
DoOnCellAttributes(ACol - FixedCols, ARow - FixedRows, dc, AState, CellAttribs);
end;
procedure TVarGrid.DoOnCheckBoxClick(ACol, ARow: integer);
var
i, dc, c: integer;
ca: TCellAttributes;
st: TCheckBoxState;
begin
if Assigned(FOnCheckBoxClick) then begin
dc:=ColToDataCol(ACol);
c:=ACol - FixedCols;
FOnCheckBoxClick(Self, c, ARow - FixedRows, dc);
if (SelCount > 0) and RowSelected[ARow - FixedRows] then begin
SetupCell(ACol, ARow, [], ca);
st:=ca.State;
for i:=0 to Items.Count - 1 do
if RowSelected[i] then begin
SetupCell(ACol, i + FixedRows, [], ca);
if (coDrawCheckBox in ca.Options) and (ca.State <> st) then
FOnCheckBoxClick(Self, c, i, dc);
end;
end;
end;
end;
procedure TVarGrid.DoOnTreeButtonClick(ACol, ARow: integer);
begin
if Assigned(FOnTreeButtonClick) then
FOnTreeButtonClick(Self, ACol - FixedCols, ARow - FixedRows, ColToDataCol(ACol));
end;
constructor TVarGrid.Create(AOwner: TComponent);
begin
FRow:=-1;
FHintCell.x:=-1;
inherited Create(AOwner);
FixedRows:=1;
FixedCols:=0;
Options:=[goRowSelect, goThumbTracking, goVertLine, goHorzLine, goColSizing, goColMoving, goDblClickAutoSize, goFixedHorzLine, goFixedVertLine];
MouseWheelOption:=mwGrid;
FItems:=TVarList.Create(1, 0);
FItems.OnDataChanged:=@ItemsChanged;
ItemsChanged(nil);
TitleStyle:=tsNative;
FAnchor:=-1;
FSortColumn:=-1;
ShowHint:=True;
SetLength(FColumnsMap, 1);
FColumnsMap[0]:=0;
end;
destructor TVarGrid.Destroy;
begin
inherited Destroy;
FItems.Free;
end;
procedure TVarGrid.RemoveSelection;
var
i: integer;
begin
for i:=0 to FItems.Count - 1 do
RowSelected[i]:=False;
FSelCount:=0;
end;
procedure TVarGrid.SelectAll;
var
i: integer;
begin
for i:=0 to FItems.Count - 1 do
RowSelected[i]:=True;
end;
procedure TVarGrid.Sort;
var
i, c: integer;
begin
if (FSortColumn >= 0) and (FItems.Count > 0) then begin
c:=FSortColumn;
if Assigned(FOnSortColumn) then
FOnSortColumn(Self, c);
if not FItems.IsUpdating and (Row >= 0) and (Row < FItems.Count) then
FItems.RowOptions[Row]:=FItems.RowOptions[Row] or roCurRow;
FItems.Sort(c, SortOrder = soDescending);
if not FItems.IsUpdating then begin
for i:=0 to FItems.Count - 1 do
if LongBool(FItems.RowOptions[i] and roCurRow) then begin
FItems.RowOptions[i]:=FItems.RowOptions[i] and not roCurRow;
Row:=i;
break;
end;
Invalidate;
end;
end;
end;