ehgrids.pas

很COOL的GRID控件

{*******************************************************}
{                                                       }
{       Borland Delphi Visual Component Library         }
{                                                       }
{       Copyright (c) 1995,99 Inprise Corporation       }
{                                                       }
{*******************************************************}

unit EHGrids;

{$R-,T-,H+,X+}

interface

uses Messages, Windows, SysUtils, Classes, Graphics, Menus, Controls, Forms,
  StdCtrls, Mask,Grids;


type
  TCustomGridEh = class;

  TInplaceEditEh = class(TCustomMaskEdit)
  private
    FGrid: TCustomGridEh;
    FClickTime: Longint;
    procedure InternalMove(const Loc: TRect; Redraw: Boolean);
    procedure SetGrid(Value: TCustomGridEh);
    procedure CMShowingChanged(var Message: TMessage); message CM_SHOWINGCHANGED;
    procedure WMGetDlgCode(var Message: TWMGetDlgCode); message WM_GETDLGCODE;
    procedure WMPaste(var Message); message WM_PASTE;
    procedure WMCut(var Message); message WM_CUT;
    procedure WMClear(var Message); message WM_CLEAR;
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure DblClick; override;
    function DoMouseWheel(Shift: TShiftState; WheelDelta: Integer;
      MousePos: TPoint): Boolean; override;
    function EditCanModify: Boolean; override;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure KeyUp(var Key: Word; Shift: TShiftState); override;
    procedure BoundsChanged; virtual;
    procedure UpdateContents; virtual;
    procedure WndProc(var Message: TMessage); override;
    property  Grid: TCustomGridEh read FGrid;
  public
    constructor Create(AOwner: TComponent); override;
    procedure Deselect;
    procedure Hide;
    procedure Invalidate; reintroduce;
    procedure Move(const Loc: TRect);
    function PosEqual(const Rect: TRect): Boolean;
    procedure SetFocus; reintroduce;
    procedure UpdateLoc(const Loc: TRect);
    function Visible: Boolean;
  end;
  TEditorChangedEvent = procedure (Sender: TObject; isShowing:Boolean; Const Bounds:TRect;
                        ACol,ARow:Longint) of object;
  TCustomGridEh = class(TCustomControl)
  private
    FAnchor: TGridCoord;
    FBorderStyle: TBorderStyle;
    FCanEditModify: Boolean;
    FColCount: Longint;
    FColWidths: Pointer;
    FTabStops: Pointer;
    FCurrent: TGridCoord;
    FDefaultColWidth: Integer;
    FDefaultRowHeight: Integer;
    FFixedCols: Integer;
    FFixedRows: Integer;
    FFixedColor: TColor;
    FGridLineWidth: Integer;
    FOptions: TGridOptions;
    FRowCount: Longint;
    FRowHeights: Pointer;
    FScrollBars: TScrollStyle;
    FTopLeft: TGridCoord;
    FSizingIndex: Longint;
    FSizingPos, FSizingOfs: Integer;
    FMoveIndex, FMovePos: Longint;
    FHitTest: TPoint;
    FInplaceEdit: TInplaceEditEh;
    FInplaceCol, FInplaceRow: Longint;
    FColOffset: Integer;
    FDefaultDrawing: Boolean;
    FEditorMode: Boolean;
    //Dennis Added start
        FLineColor: TColor;
        FSelectedColor: TColor;
        FSelectedFontColor: TColor;
        FOnEditorChanged:TEditorChangedEvent;
    //Dennis Added end

    function CalcCoordFromPoint(X, Y: Integer;
      const DrawInfo: TGridDrawInfo): TGridCoord;
    procedure CalcDrawInfoXY(var DrawInfo: TGridDrawInfo;
      UseWidth, UseHeight: Integer);
    function CalcMaxTopLeft(const Coord: TGridCoord;
      const DrawInfo: TGridDrawInfo): TGridCoord;
    procedure CancelMode;
    procedure ChangeGridOrientation(RightToLeftOrientation: Boolean);
    procedure ChangeSize(NewColCount, NewRowCount: Longint);
    procedure ClampInView(const Coord: TGridCoord);
    procedure DrawSizingLine(const DrawInfo: TGridDrawInfo);
    procedure DrawMove;
    procedure FocusCell(ACol, ARow: Longint; MoveAnchor: Boolean);
    procedure GridRectToScreenRect(GridRect: TGridRect;
      var ScreenRect: TRect; IncludeLine: Boolean);
    procedure HideEdit;
    procedure Initialize;
    procedure InvalidateGrid;
    procedure InvalidateRect(ARect: TGridRect);
    procedure ModifyScrollBar(ScrollBar, ScrollCode, Pos: Cardinal;
      UseRightToLeft: Boolean);
    procedure MoveAdjust(var CellPos: Longint; FromIndex, ToIndex: Longint);
    procedure MoveAnchor(const NewAnchor: TGridCoord);
    procedure MoveAndScroll(Mouse, CellHit: Integer; var DrawInfo: TGridDrawInfo;
      var Axis: TGridAxisDrawInfo; Scrollbar: Integer; const MousePt: TPoint);
    procedure MoveCurrent(ACol, ARow: Longint; MoveAnchor, Show: Boolean);
    procedure MoveTopLeft(ALeft, ATop: Longint);
    procedure ResizeCol(Index: Longint; OldSize, NewSize: Integer);
    procedure ResizeRow(Index: Longint; OldSize, NewSize: Integer);
    procedure SelectionMoved(const OldSel: TGridRect);
    procedure ScrollDataInfo(DX, DY: Integer; var DrawInfo: TGridDrawInfo);
    procedure TopLeftMoved(const OldTopLeft: TGridCoord);
    procedure UpdateScrollPos;
    procedure UpdateScrollRange;
    function GetColWidths(Index: Longint): Integer;
    function GetRowHeights(Index: Longint): Integer;
    function GetSelection: TGridRect;
    function GetTabStops(Index: Longint): Boolean;
    function GetVisibleColCount: Integer;
    function GetVisibleRowCount: Integer;
    function IsActiveControl: Boolean;
    procedure ReadColWidths(Reader: TReader);
    procedure ReadRowHeights(Reader: TReader);
    procedure SetBorderStyle(Value: TBorderStyle);
    procedure SetCol(Value: Longint);
    procedure SetColCount(Value: Longint);
    procedure SetColWidths(Index: Longint; Value: Integer);
    procedure SetDefaultColWidth(Value: Integer);
    procedure SetDefaultRowHeight(Value: Integer);
    procedure SetEditorMode(Value: Boolean);
    procedure SetFixedColor(Value: TColor);
    procedure SetFixedCols(Value: Integer);
    procedure SetFixedRows(Value: Integer);
    procedure SetGridLineWidth(Value: Integer);
    procedure SetLeftCol(Value: Longint);
    procedure SetOptions(Value: TGridOptions);
    procedure SetRow(Value: Longint);
    procedure SetRowCount(Value: Longint);
    procedure SetRowHeights(Index: Longint; Value: Integer);
    procedure SetScrollBars(Value: TScrollStyle);
    procedure SetSelection(Value: TGridRect);
    procedure SetTabStops(Index: Longint; Value: Boolean);
    procedure SetTopRow(Value: Longint);
    procedure UpdateEdit;
    procedure UpdateText;
    procedure WriteColWidths(Writer: TWriter);
    procedure WriteRowHeights(Writer: TWriter);
    procedure CMCancelMode(var Msg: TMessage); message CM_CANCELMODE;
    procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
    procedure CMCtl3DChanged(var Message: TMessage); message CM_CTL3DCHANGED;
    procedure CMDesignHitTest(var Msg: TCMDesignHitTest); message CM_DESIGNHITTEST;
    procedure CMWantSpecialKey(var Msg: TCMWantSpecialKey); message CM_WANTSPECIALKEY;
    procedure CMShowingChanged(var Message: TMessage); message CM_SHOWINGCHANGED;
    procedure WMChar(var Msg: TWMChar); message WM_CHAR;
    procedure WMCancelMode(var Msg: TWMCancelMode); message WM_CANCELMODE;
    procedure WMCommand(var Message: TWMCommand); message WM_COMMAND;
    procedure WMGetDlgCode(var Msg: TWMGetDlgCode); message WM_GETDLGCODE;
    procedure WMHScroll(var Msg: TWMHScroll); message WM_HSCROLL;
    procedure WMKillFocus(var Msg: TWMKillFocus); message WM_KILLFOCUS;
    procedure WMLButtonDown(var Message: TMessage); message WM_LBUTTONDOWN;
    procedure WMNCHitTest(var Msg: TWMNCHitTest); message WM_NCHITTEST;
    procedure WMSetCursor(var Msg: TWMSetCursor); message WM_SETCURSOR;
    procedure WMSetFocus(var Msg: TWMSetFocus); message WM_SETFOCUS;
    procedure WMSize(var Msg: TWMSize); message WM_SIZE;
    procedure WMTimer(var Msg: TWMTimer); message WM_TIMER;
    procedure WMVScroll(var Msg: TWMVScroll); message WM_VSCROLL;
        procedure SetLineColor(Value: TColor);
        function GetLineColor: TColor;
        procedure SetSelectedColor(Value: TColor);
        function GetSelectedColor: TColor;
        procedure SetSelectedFontColor(Value: TColor);
        function GetSelectedFontColor: TColor;
  protected
    FGridState: TGridState;
    FSaveCellExtents: Boolean;
    DesignOptionsBoost: TGridOptions;
    VirtualView: Boolean;
    procedure CalcDrawInfo(var DrawInfo: TGridDrawInfo);
    procedure CalcFixedInfo(var DrawInfo: TGridDrawInfo);
    procedure CalcSizingState(X, Y: Integer; var State: TGridState;
      var Index: Longint; var SizingPos, SizingOfs: Integer;
      var FixedInfo: TGridDrawInfo); virtual;
    function CreateEditor: TInplaceEditEh; virtual;
    procedure CreateParams(var Params: TCreateParams); override;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer); override;
    procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer); override;
    procedure AdjustSize(Index, Amount: Longint; Rows: Boolean); reintroduce; dynamic;
    function BoxRect(ALeft, ATop, ARight, ABottom: Longint): TRect;
    procedure DoExit; override;
    function CellRect(ACol, ARow: Longint): TRect;
    function CanEditAcceptKey(Key: Char): Boolean; dynamic;
    function CanGridAcceptKey(Key: Word; Shift: TShiftState): Boolean; dynamic;
    function CanEditModify: Boolean; dynamic;
    function CanEditShow: Boolean; virtual;
    function DoMouseWheelDown(Shift: TShiftState; MousePos: TPoint): Boolean; override;
    function DoMouseWheelUp(Shift: TShiftState; MousePos: TPoint): Boolean; override;
    function GetEditText(ACol, ARow: Longint): string; dynamic;
    procedure SetEditText(ACol, ARow: Longint; const Value: string); dynamic;
    function GetEditMask(ACol, ARow: Longint): string; dynamic;
    function GetEditLimit: Integer; dynamic;
    function GetGridWidth: Integer;
    function GetGridHeight: Integer;
    procedure HideEditor;
    procedure ShowEditor;
    procedure ShowEditorChar(Ch: Char);
    procedure InvalidateEditor;
    procedure MoveColumn(FromIndex, ToIndex: Longint);
    procedure ColumnMoved(FromIndex, ToIndex: Longint); dynamic;
    procedure MoveRow(FromIndex, ToIndex: Longint);
    procedure RowMoved(FromIndex, ToIndex: Longint); dynamic;
    procedure DrawCell(ACol, ARow: Longint; ARect: TRect;
      AState: TGridDrawState); virtual; abstract;
    procedure DefineProperties(Filer: TFiler); override;
    procedure MoveColRow(ACol, ARow: Longint; MoveAnchor, Show: Boolean);
    function SelectCell(ACol, ARow: Longint): Boolean; virtual;
    procedure SizeChanged(OldColCount, OldRowCount: Longint); dynamic;
    function Sizing(X, Y: Integer): Boolean;
    procedure ScrollData(DX, DY: Integer);
    procedure InvalidateCell(ACol, ARow: Longint);
    procedure InvalidateCol(ACol: Longint);
    procedure InvalidateRow(ARow: Longint);
    procedure TopLeftChanged; dynamic;
    procedure TimedScroll(Direction: TGridScrollDirection); dynamic;
    procedure Paint; override;
    procedure ColWidthsChanged; dynamic;
    procedure RowHeightsChanged; dynamic;
    procedure DeleteColumn(ACol: Longint); virtual;
    procedure DeleteRow(ARow: Longint); virtual;
    procedure UpdateDesigner;
    function BeginColumnDrag(var Origin, Destination: Integer;
      const MousePt: TPoint): Boolean; dynamic;
    function BeginRowDrag(var Origin, Destination: Integer;
      const MousePt: TPoint): Boolean; dynamic;
    function CheckColumnDrag(var Origin, Destination: Integer;
      const MousePt: TPoint): Boolean; dynamic;
    function CheckRowDrag(var Origin, Destination: Integer;
      const MousePt: TPoint): Boolean; dynamic;
    function EndColumnDrag(var Origin, Destination: Integer;
      const MousePt: TPoint): Boolean; dynamic;
    function EndRowDrag(var Origin, Destination: Integer;
      const MousePt: TPoint): Boolean; dynamic;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function MouseCoord(X, Y: Integer): TGridCoord;
    property OnEditorChanged:TEditorChangedEvent Read FOnEditorChanged write FOnEditorChanged;
    property Col: Longint read FCurrent.X write SetCol;
    property Row: Longint read FCurrent.Y write SetRow;
    property TopRow: Longint read FTopLeft.Y write SetTopRow;
    property VisibleColCount: Integer read GetVisibleColCount;
    property VisibleRowCount: Integer read GetVisibleRowCount;
    property ColWidths[Index: Longint]: Integer read GetColWidths write SetColWidths;
    property BorderStyle: TBorderStyle read FBorderStyle write SetBorderStyle default bsSingle;
    property Color default clWindow;
    property ColCount: Longint read FColCount write SetColCount default 5;
    property DefaultColWidth: Integer read FDefaultColWidth write SetDefaultColWidth default 64;
    property DefaultDrawing: Boolean read FDefaultDrawing write FDefaultDrawing default True;
    property DefaultRowHeight: Integer read FDefaultRowHeight write SetDefaultRowHeight default 24;
    property EditorMode: Boolean read FEditorMode write SetEditorMode;
    property FixedColor: TColor read FFixedColor write SetFixedColor default clBtnFace;
    property FixedCols: Integer read FFixedCols write SetFixedCols default 1;
    property FixedRows: Integer read FFixedRows write SetFixedRows default 1;
    property GridHeight: Integer read GetGridHeight;
    property GridLineWidth: Integer read FGridLineWidth write SetGridLineWidth default 1;
    property GridWidth: Integer read GetGridWidth;
    property HitTest: TPoint read FHitTest;
    property InplaceEditor: TInplaceEditEh read FInplaceEdit;
    property LeftCol: Longint read FTopLeft.X write SetLeftCol;
    property Options: TGridOptions read FOptions write SetOptions
      default [goFixedVertLine, goFixedHorzLine, goVertLine, goHorzLine,
      goRangeSelect];
    property ParentColor default False;
    property RowCount: Longint read FRowCount write SetRowCount default 5;
    property RowHeights[Index: Longint]: Integer read GetRowHeights write SetRowHeights;
    property ScrollBars: TScrollStyle read FScrollBars write SetScrollBars default ssBoth;
    property Selection: TGridRect read GetSelection write SetSelection;
    property TabStops[Index: Longint]: Boolean read GetTabStops write SetTabStops;
    //Dennis Added
    procedure EditorChanged(Sender:TObject; isShowing: Boolean; const NewBounds: TRect; ACol: Longint; ARow: Longint); dynamic;
    //Dennis Added end;
  published
    property TabStop default True;
        property LineColor: TColor read GetLineColor write SetLineColor;
        property SelectedColor: TColor read GetSelectedColor write SetSelectedColor default clHighLight;
        property SelectedFontColor: TColor read GetSelectedFontColor write SetSelectedFontColor;
  end;


implementation

uses Math, Consts;

type
  PIntArray = ^TIntArray;
  TIntArray = array[0..MaxCustomExtents] of Integer;

procedure InvalidOp(const id: string);
begin
  raise EInvalidGridOperation.Create(id);
end;

function GridRect(Coord1, Coord2: TGridCoord): TGridRect;
begin
  with Result do
  begin
    Left := Coord2.X;
    if Coord1.X < Coord2.X then Left := Coord1.X;
    Right := Coord1.X;
    if Coord1.X < Coord2.X then Right := Coord2.X;
    Top := Coord2.Y;
    if Coord1.Y < Coord2.Y then Top := Coord1.Y;
    Bottom := Coord1.Y;
    if Coord1.Y < Coord2.Y then Bottom := Coord2.Y;
  end;
end;

function PointInGridRect(Col, Row: Longint; const Rect: TGridRect): Boolean;
begin
  Result := (Col >= Rect.Left) and (Col <= Rect.Right) and (Row >= Rect.Top)
    and (Row <= Rect.Bottom);
end;

type
  TXorRects = array[0..3] of TRect;

procedure XorRects(const R1, R2: TRect; var XorRects: TXorRects);
var
  Intersect, Union: TRect;

  function PtInRect(X, Y: Integer; const Rect: TRect): Boolean;
  begin
    with Rect do Result := (X >= Left) and (X <= Right) and (Y >= Top) and
      (Y <= Bottom);
  end;

  function Includes(const P1: TPoint; var P2: TPoint): Boolean;
  begin
    with P1 do
    begin
      Result := PtInRect(X, Y, R1) or PtInRect(X, Y, R2);
      if Result then P2 := P1;
    end;
  end;

  function Build(var R: TRect; const P1, P2, P3: TPoint): Boolean;
  begin
    Build := True;
    with R do
      if Includes(P1, TopLeft) then
      begin
        if not Includes(P3, BottomRight) then BottomRight := P2;
      end
      else if Includes(P2, TopLeft) then BottomRight := P3
      else Build := False;
  end;

begin
  FillChar(XorRects, SizeOf(XorRects), 0);
  if not Bool(IntersectRect(Intersect, R1, R2)) then
  begin
    { Don't intersect so its simple }
    XorRects[0] := R1;
    XorRects[1] := R2;
  end
  else
  begin
    UnionRect(Union, R1, R2);
    if Build(XorRects[0],
      Point(Union.Left, Union.Top),
      Point(Union.Left, Intersect.Top),
      Point(Union.Left, Intersect.Bottom)) then
      XorRects[0].Right := Intersect.Left;
    if Build(XorRects[1],
      Point(Intersect.Left, Union.Top),
      Point(Intersect.Right, Union.Top),
      Point(Union.Right, Union.Top)) then
      XorRects[1].Bottom := Intersect.Top;
    if Build(XorRects[2],
      Point(Union.Right, Intersect.Top),
      Point(Union.Right, Intersect.Bottom),
      Point(Union.Right, Union.Bottom)) then
      XorRects[2].Left := Intersect.Right;
    if Build(XorRects[3],
      Point(Union.Left, Union.Bottom),
      Point(Intersect.Left, Union.Bottom),
      Point(Intersect.Right, Union.Bottom)) then
      XorRects[3].Top := Intersect.Bottom;
  end;
end;

procedure ModifyExtents(var Extents: Pointer; Index, Amount: Longint;
  Default: Integer);
var
  LongSize, OldSize: LongInt;