425 lines
12 KiB
ObjectPascal
425 lines
12 KiB
ObjectPascal
{-----------------------------------------------------------------------------
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The contents of this file are subject to the Mozilla Public License
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Version 1.1 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.mozilla.org/MPL/MPL-1.1.html
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See the License for
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the specific language governing rights and limitations under the License.
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The Original Code is: JvDBDatePickerEdit, released on 2002-10-04.
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The Initial Developer of the Original Code is Oliver Giesen [giesen att lucatec dott com]
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Portions created by Oliver Giesen are Copyright (C) 2002 Lucatec GmbH.
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All Rights Reserved.
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Contributor(s): ______________________________________.
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You may retrieve the latest version of this file at the Project JEDI's JVCL home page,
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located at http://jvcl.sourceforge.net
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Description:
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A data-aware variation of the DatePickerEdit component.
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Notable features:
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- The inherited NoDateText mechanism is enhanced and utilized to support proper
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handling of NULL values.
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- If EnforceRequired is set to True (default) you should not have to worry
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about setting ShowCheckBox. If the associated field has the Required flag set
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ShowCheckBox will automatically be False.
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Known Issues:
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-----------------------------------------------------------------------------}
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// $Id: JvDBDatePickerEdit.pas,v 1.27 2005/03/06 23:04:09 remkobonte Exp $
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unit JvDBDatePickerEdit;
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{$I jvcl.inc}
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interface
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uses
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{$IFDEF UNITVERSIONING}
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JclUnitVersioning,
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{$ENDIF UNITVERSIONING}
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Messages, Classes, Controls, DB, DBCtrls,
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JvDatePickerEdit;
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type
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TJvCustomDBDatePickerEdit = class(TJvCustomDatePickerEdit)
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private
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FDataLink: TFieldDataLink;
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FEnforceRequired: Boolean;
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procedure ValidateShowCheckBox; overload;
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function ValidateShowCheckBox(const AValue: Boolean): Boolean; overload;
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function GetDataField: string;
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function GetDataSource: TDataSource;
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procedure SetDataField(const AValue: string);
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procedure SetDataSource(const AValue: TDataSource);
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procedure SetEnforceRequired(const AValue: Boolean);
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procedure CMGetDataLink(var Msg: TMessage); message CM_GETDATALINK;
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protected
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procedure WMCut(var Msg: TMessage); message WM_CUT;
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procedure WMPaste(var Msg: TMessage); message WM_PASTE;
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procedure WMUndo(var Msg: TMessage); message WM_UNDO;
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procedure DataChange(Sender: TObject);
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procedure UpdateData(Sender: TObject);
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function IsLinked: Boolean;
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procedure Change; override;
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procedure DoKillFocus(const ANextControl: TWinControl); override;
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procedure PopupDropDown(DisableEdit: Boolean); override;
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function EditCanModify: Boolean; override;
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procedure SetChecked(const AValue: Boolean); override;
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procedure SetShowCheckbox(const AValue: Boolean); override;
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procedure UpdateDisplay; override;
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function GetEnableValidation: Boolean; override;
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function ValidateDate(const ADate: TDateTime): Boolean; override;
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property DataField: string read GetDataField write SetDataField;
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property DataSource: TDataSource read GetDataSource write SetDataSource;
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property EnforceRequired: Boolean read FEnforceRequired write SetEnforceRequired default False;
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public
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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function IsEmpty: Boolean; override;
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end;
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TJvDBDatePickerEdit = class(TJvCustomDBDatePickerEdit)
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public
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property Checked;
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property Date;
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property Dropped;
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published
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property Action;
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property Align;
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property AllowNoDate;
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property AlwaysReturnEditDate;
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property Anchors;
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property AutoSelect;
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property AutoSize;
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property BorderStyle;
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property ButtonFlat;
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property ButtonHint;
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property ButtonWidth;
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property CalendarAppearance;
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property Caret;
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property CharCase;
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property ClipboardCommands;
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property Color;
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property Constraints;
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//property Cursor; {already published}
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property DataField;
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property DataSource;
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property DateFormat;
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property DateSeparator;
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property DirectInput;
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property DisabledColor;
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property DisabledTextColor;
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property DragCursor;
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property DragKind;
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property DragMode;
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property Enabled;
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property EnableValidation;
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property EnforceRequired;
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property Font;
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property Glyph;
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property GroupIndex;
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property HideSelection;
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property HintColor;
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property HotTrack;
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// property MaxYear default 2900;
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// property MinYear default 1900;
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{$IFDEF VCL}
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{property BiDiMode;}
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property Flat;
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{property ParentBiDiMode;}
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property ImeMode;
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property ImeName;
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property OEMConvert;
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property ParentCtl3D;
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property OnEndDock;
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property OnStartDock;
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{$ENDIF VCL}
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property ImageIndex;
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property ImageKind;
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property Images;
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property NoDateShortcut;
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property NoDateText;
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property NumGlyphs;
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property ParentColor;
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property ParentFont;
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property ParentShowHint;
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property PopupMenu;
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property ReadOnly;
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property ShowHint;
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property ShowCheckBox;
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property StoreDateFormat;
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property TabOrder;
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{property TabStop;} {(rb) Why disabled?}
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property Visible;
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property OnButtonClick;
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property OnChange;
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property OnClick;
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property OnCheckClick;
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property OnContextPopup;
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property OnDblClick;
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property OnDragDrop;
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property OnDragOver;
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property OnEnabledChanged;
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property OnEndDrag;
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property OnEnter;
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property OnExit;
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property OnKeyDown;
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property OnKeyPress;
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property OnKeyUp;
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property OnKillFocus;
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property OnMouseDown;
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property OnMouseEnter;
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property OnMouseLeave;
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property OnMouseMove;
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property OnMouseUp;
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property OnParentColorChange;
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property OnSetFocus;
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property OnStartDrag;
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end;
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{$IFDEF UNITVERSIONING}
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const
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UnitVersioning: TUnitVersionInfo = (
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RCSfile: '$RCSfile: JvDBDatePickerEdit.pas,v $';
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Revision: '$Revision: 1.27 $';
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Date: '$Date: 2005/03/06 23:04:09 $';
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LogPath: 'JVCL\run'
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);
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{$ENDIF UNITVERSIONING}
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implementation
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uses
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{$IFDEF HAS_UNIT_VARIANTS}
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Variants,
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{$ENDIF HAS_UNIT_VARIANTS}
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SysUtils;
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//=== { TJvCustomDBDatePickerEdit } ==========================================
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procedure TJvCustomDBDatePickerEdit.Change;
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begin
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if IsLinked then
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FDataLink.Modified;
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inherited Change;
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end;
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procedure TJvCustomDBDatePickerEdit.CMGetDataLink(var Msg: TMessage);
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begin
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Msg.Result := Integer(FDataLink);
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end;
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constructor TJvCustomDBDatePickerEdit.Create(AOwner: TComponent);
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begin
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inherited Create(AOwner);
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ControlStyle := ControlStyle + [csReplicatable];
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FEnforceRequired := False;
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FDataLink := TFieldDataLink.Create;
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with FDataLink do
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begin
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Control := Self;
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OnDataChange := DataChange;
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OnUpdateData := UpdateData;
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end;
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end;
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procedure TJvCustomDBDatePickerEdit.DataChange(Sender: TObject);
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begin
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if IsLinked then
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Self.Date := FDataLink.Field.AsDateTime;
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end;
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destructor TJvCustomDBDatePickerEdit.Destroy;
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begin
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FDataLink.OnDataChange := nil;
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FDataLink.OnUpdateData := nil;
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FreeAndNil(FDataLink);
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inherited Destroy;
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end;
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procedure TJvCustomDBDatePickerEdit.WMCut(var Msg: TMessage);
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begin
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if EditCanModify then
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inherited;
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end;
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procedure TJvCustomDBDatePickerEdit.WMPaste(var Msg: TMessage);
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begin
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if EditCanModify then
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inherited;
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end;
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procedure TJvCustomDBDatePickerEdit.DoKillFocus(const ANextControl: TWinControl);
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begin
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if IsLinked and FDataLink.Editing then
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try
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FDataLink.UpdateRecord;
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except
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SetFocus;
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raise;
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end;
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inherited DoKillFocus(ANextControl);
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end;
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procedure TJvCustomDBDatePickerEdit.WMUndo(var Msg: TMessage);
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begin
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if EditCanModify then
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inherited;
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end;
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function TJvCustomDBDatePickerEdit.EditCanModify: Boolean;
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begin
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Result := (not IsLinked) or FDataLink.Edit;
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end;
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function TJvCustomDBDatePickerEdit.GetDataField: string;
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begin
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if FDataLink <> nil then
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Result := FDataLink.FieldName
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else
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Result := '';
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end;
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function TJvCustomDBDatePickerEdit.GetDataSource: TDataSource;
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begin
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if FDataLink <> nil then
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Result := FDataLink.DataSource
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else
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Result := nil;
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end;
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function TJvCustomDBDatePickerEdit.GetEnableValidation: Boolean;
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begin
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Result := inherited GetEnableValidation;
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{if we enabled "as-you-type" validation for an unlinked control, we'd have
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validation errors pop up just from tabbing over the control, therefore we
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temporary disable it}
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if InternalChanging or Leaving then
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Result := Result and IsLinked and FDataLink.Editing;
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end;
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function TJvCustomDBDatePickerEdit.IsEmpty: Boolean;
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begin
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if IsLinked then
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begin
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if FDataLink.Editing then
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Result := inherited IsEmpty
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else
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try
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Result := FDataLink.DataSet.IsEmpty or FDataLink.Field.IsNull;
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except
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Result := True;
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end;
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end
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else
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Result := True;
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end;
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function TJvCustomDBDatePickerEdit.IsLinked: Boolean;
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begin
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Result := Assigned(FDataLink) and Assigned(FDataLink.Field);
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end;
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procedure TJvCustomDBDatePickerEdit.PopupDropDown(DisableEdit: Boolean);
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begin
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if EditCanModify then
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inherited PopupDropDown(DisableEdit);
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end;
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procedure TJvCustomDBDatePickerEdit.SetChecked(const AValue: Boolean);
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begin
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if AValue <> Checked then
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begin
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if EditCanModify then
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inherited SetChecked(AValue)
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else
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UpdateDisplay;
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end;
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end;
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procedure TJvCustomDBDatePickerEdit.SetDataField(const AValue: string);
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begin
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FDataLink.FieldName := AValue;
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ValidateShowCheckBox;
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end;
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procedure TJvCustomDBDatePickerEdit.SetDataSource(const AValue: TDataSource);
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begin
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FDataLink.DataSource := AValue;
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ValidateShowCheckBox;
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end;
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procedure TJvCustomDBDatePickerEdit.SetEnforceRequired(const AValue: Boolean);
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begin
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FEnforceRequired := AValue;
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ValidateShowCheckBox;
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end;
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procedure TJvCustomDBDatePickerEdit.SetShowCheckbox(const AValue: Boolean);
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begin
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inherited SetShowCheckbox(ValidateShowCheckBox(AValue));
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end;
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procedure TJvCustomDBDatePickerEdit.UpdateData(Sender: TObject);
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begin
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if IsLinked and FDataLink.Editing then
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if not Checked then
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FDataLink.Field.Value := Null
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else
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FDataLink.Field.AsDateTime := Self.Date;
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end;
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procedure TJvCustomDBDatePickerEdit.UpdateDisplay;
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begin
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if IsLinked then
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inherited UpdateDisplay
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else
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begin
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Checked := False;
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if not (csDesigning in ComponentState) then
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Text := '';
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end;
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end;
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function TJvCustomDBDatePickerEdit.ValidateDate(const ADate: TDateTime): Boolean;
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begin
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Result := (not IsLinked) or (FDataLink.DataSet.IsEmpty) or
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(not FDataLink.Editing) or
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((not Focused) and (FDataLink.DataSet.State = dsInsert) and FDataLink.Field.IsNull) or
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(inherited ValidateDate(ADate));
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end;
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function TJvCustomDBDatePickerEdit.ValidateShowCheckBox(const AValue: Boolean): Boolean;
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begin
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Result := AValue;
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if EnforceRequired and IsLinked then
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begin
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if AValue and FDataLink.Field.Required then
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Result := False;
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AllowNoDate := not FDataLink.Field.Required;
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end;
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end;
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procedure TJvCustomDBDatePickerEdit.ValidateShowCheckBox;
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begin
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inherited SetShowCheckbox(ValidateShowCheckBox(ShowCheckBox));
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end;
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{$IFDEF UNITVERSIONING}
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initialization
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RegisterUnitVersion(HInstance, UnitVersioning);
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finalization
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UnregisterUnitVersion(HInstance);
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{$ENDIF UNITVERSIONING}
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end.
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