340 lines
9.7 KiB
ObjectPascal
340 lines
9.7 KiB
ObjectPascal
unit JKFootpanel;
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interface
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uses
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Windows, Messages, SysUtils, Classes,Graphics, Controls, Forms, Dialogs,
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ExtCtrls, dbctrls, stdctrls, db, ADODB, ComCtrls;
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type
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TEditorstyle = (TsDbMemo,TsDBcombox,Tsdbedit);
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type
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TJKFootpanel = class(TPanel)
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private
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{ Private declarations }
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FLeft: Integer;
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FTop: Integer;
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maxTextLen: Integer;
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maxLabelLen: Integer;
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FScrollBox: TScrollBox; {滚动控件}
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FLineHeight: Integer;
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FEditorstyle:Teditorstyle;
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FTitleVisible :Boolean;
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//数据数组控件，动态生成
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MemoEditors :array of TDBMemo;
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comEditors :array of TDBCombobox;
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edEditors :array of TDBedit;
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Labels :array of TLAbel; //字段标题，动态生成
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FDataSource :TDataSource; // 数据源
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FColumns :Integer; //显示列数
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procedure FreeEditors; //释放数据输入控件的内存
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procedure AKeyDown(Sender :TObject; var Key: Word; Shift:TShiftState);
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procedure AKeyPress(Sender :TObject; var Key: Char);
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function comEditor(Index :Integer):TDBComboBox;
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function edEditor(Index :Integer):TDBedit;
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function MemoEditor(Index :Integer): TDBMemo;
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protected
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{ Protected declarations }
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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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procedure Setedit(Value :TEditorstyle);
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procedure ClearHits(ItemIndex :Integer);
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procedure AddHits(ItemIndex :Integer; Hits :array of string);
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Function CreateEditors(DS :TDataSource; ColCount :Integer) :integer; //创建各字段的数据输入控件
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{ Public declarations }
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published
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property LimitLeft :Integer read FLeft write FLeft default 10;
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property LimitTop :Integer read FTop write FTop default 10;
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property Editorstyle :TEditorstyle read FEditorstyle write FEditorstyle default Tsdbedit;
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property EditorWidth :Integer read maxTextLen write maxTextLen default 100;
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property TitleWidth :Integer read maxLabelLen write maxLabelLen default 100;
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property LineHeight :Integer read FLineHeight write FLineHeight default 15;
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property TitleVisible :Boolean read FTitleVisible write FTitleVisible default True;
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property DataSource :TDataSource read FDataSource write FDataSource; //数据源
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property Columns :Integer read FColumns write FColumns default 4;//表列数
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{ Published declarations }
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end;
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procedure Register;
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implementation
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constructor TJKFootpanel.Create(AOwner: TComponent);
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begin
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Inherited Create(AOWner);
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FLeft :=16;
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FTop := 10;
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maxTextLen := 100;
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maxLabelLen := 100;
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FLineHeight := 15;
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FTitleVisible := True;
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Editorstyle := Tsdbedit;
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end;
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procedure Register;
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begin
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RegisterComponents('Data Controls', [TJKFootpanel]);
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end;
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procedure TJKFootpanel.Setedit(Value : TEditorstyle);
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begin
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if FEditorstyle <> Value then
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begin
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FEditorstyle := Value;
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Invalidate;
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end;
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end;
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{ 为第I字段增加提示信息的方法}
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procedure TJKFootpanel.AddHits(ItemIndex:
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Integer; Hits: array of string);
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var
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m,n,i: Integer;
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begin
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if FEditorstyle = TsDBcombox then
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begin
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n := Length(comEditors);
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m := Length(Hits);
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if ItemIndex< n then
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for i:=0 to m-1 do
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comEditors[ItemIndex].Items.Add(Hits[i]);
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end
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else if FEditorstyle = TsDBEdit then
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begin
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n := Length(edEditors);
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m := Length(Hits);
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if ItemIndex< n then
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for i:=0 to m-1 do
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edEditors[ItemIndex].Hint:= Hits[i];
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end
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else if FEditorstyle = TsDBMemo then
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begin
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n := Length(memoEditors);
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m := Length(Hits);
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if ItemIndex< n then
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for i:=0 to m-1 do
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memoEditors[ItemIndex].Hint:= Hits[i];
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end;
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end;
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procedure TJKFootpanel.AKeyPress(Sender: TObject; var Key: Char);
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begin
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if (Sender is TDBComboBox) or (Sender is TDBedit) or (Sender is TDBMemo) then
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if Key=#13 then
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(Owner as TForm).Perform(WM_NEXTDLGCTL, 0, 0);
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end;
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procedure TJKFootpanel.ClearHits(ItemIndex: Integer);
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var
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n: Integer;
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begin
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if FEditorstyle = TsDBcombox then
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begin
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n := Length(comEditors);
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if ItemIndex< n then comEditors[ItemIndex].Items.Clear;
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end
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else if FEditorstyle = TsDBEdit then
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begin
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n := Length(edEditors);
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if ItemIndex< n then edEditors[ItemIndex].Hint:='';;
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end
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else if FEditorstyle = TsDBMemo then
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begin
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n := Length(MemoEditors);
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if ItemIndex< n then MemoEditors[ItemIndex].Hint:='';;
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end;
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end;
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{ 创建各字段的数据输入控件的方法}
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Function TJKFootpanel.CreateEditors(DS: TDataSource; ColCount: Integer):Integer ;
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var
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i, n, RowCount: Integer;
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TextHeight: Integer;
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begin
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result := 120;
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if DataSource = nil then exit;
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if not DataSource.DataSet.Active then exit;
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Columns := ColCount;
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if Columns = 0 then exit;
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n := DataSource.DataSet.fieldCount;
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if n > 0 then
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begin
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DataSource.DataSet.DisableControls;
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if maxLabelLen < maxTextLen then
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maxTextLen := maxLabelLen;
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{ 计算最大的标题长度及显示长度}
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DataSource.DataSet.First;
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{ 计算高度}
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TextHeight := Canvas.TextHeight(DataSource.DataSet.Fields[0].DisplayLabel) + FLineHeight; //10;
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{ 计算行列数}
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if Columns > n then
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Columns := n
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else
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Columns := ColCount;
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RowCount := n div Columns;
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if n mod Columns <> 0 then inc(RowCount);
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{ 分配内存}
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FreeEditors;
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SetLength(Labels,n);
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if FEditorstyle = TsDBcombox then
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SetLength(comEditors,n)
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else if FEditorstyle = TsDBEdit then
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SetLength(edEditors,n)
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else
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SetLength(MemoEditors,n);
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{ 创建滚动盒}
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FScrollBox := TScrollBox.Create(Owner);
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FScrollBox.Visible := False;
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FScrollBox.Parent := Self;
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FScrollBox.Align := alClient;
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//FScrollBox.Color := clSkyBlue;
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FScrollBox.OnDblClick := OnDblClick;
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{ 创建编辑}
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for i := 0 to n - 1 do
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begin
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{ 创建标题}
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Labels[i] := TLabel.Create(Owner);
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Labels[i].visible := TitleVisible;
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Labels[i].Parent := FScrollBox;
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Labels[i].Caption := DataSource.DataSet.Fields[i].FieldName;
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Labels[i].Left := FLeft + (maxLabelLen + 16) * (i div RowCount)+ 2; //+maxTextLen
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if FEditorstyle = TsDBMemo then
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begin
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Labels[i].Width := maxLabelLen;
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Labels[i].Top := FTop + (i mod RowCount) * (TextHeight*2+4) + 12;
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end
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else
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begin
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Labels[i].Width := maxLabelLen;
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Labels[i].Top := FTop + (i mod RowCount) * (TextHeight*1 +12)
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end;
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{ 创建信息显示数据对象}
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if FEditorstyle = TsDBcombox then
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begin
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comEditors[i] := TDBComboBox.Create(Owner);
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comEditors[i].Parent := FScrollBox; //Self;
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comEditors[i].Left := Labels[i].Left; //+ Labels[i].Width;
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comEditors[i].Width := maxTextLen;
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comEditors[i].Top := Labels[i].Top+15;
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comEditors[i].DataSource := DataSource;
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comEditors[i].DataField := DataSource.DataSet.Fields[i].FieldName;
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comEditors[i].OnKeyPress := AKeyPress;
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comEditors[i].OnKeyDown := AKeyDown;
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comEditors[i].Font.Color := ClBlue;
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end
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else if FEditorstyle = TsDBEdit then
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begin
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edEditors[i] := TDBedit.Create(Owner);
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edEditors[i].Parent := FScrollBox;
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edEditors[i].Left := Labels[i].Left; //+ Labels[i].Width;
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edEditors[i].Width := maxTextLen;
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edEditors[i].Top := Labels[i].Top+15;
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edEditors[i].DataSource := DataSource;
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edEditors[i].DataField := DataSource.DataSet.Fields[i].FieldName;
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edEditors[i].OnKeyPress := AKeyPress;
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edEditors[i].OnKeyDown := AKeyDown;
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edEditors[i].Font.Color := ClBlue;
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end
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else
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begin
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MemoEditors[i] := TDBmemo.Create(Owner);
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MemoEditors[i].Parent := FScrollBox;
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MemoEditors[i].Left := Labels[i].Left;
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MemoEditors[i].Width := maxTextLen;
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MemoEditors[i].Top := Labels[i].Top+15;
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MemoEditors[i].DataSource := DataSource;
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MemoEditors[i].DataField := DataSource.DataSet.Fields[i].FieldName;
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MemoEditors[i].OnKeyPress := AKeyPress;
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MemoEditors[i].OnKeyDown := AKeyDown;
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MemoEditors[i].Font.Color := ClBlue;
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end;
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end;
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if FEditorstyle = TsDBMemo then
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result := RowCount*TextHeight*4 +20
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else
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result := RowCount*TextHeight*2 +20;
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DataSource.DataSet.EnableControls;
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FScrollBox.Visible := True;
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end;
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end;
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destructor TJKFootpanel.Destroy;
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begin
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FreeEditors;
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Inherited Destroy;
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end;
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function TJKFootpanel.comEditor(Index: Integer): TDBComboBox;
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begin
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if Index< Length(comEditors) then Result := comEditors[Index]
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else Result := nil;
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end;
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function TJKFootpanel.edEditor(Index: Integer): TDBedit;
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begin
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if Index < Length(edEditors) then Result := edEditors[Index]
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else Result := nil;
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end;
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function TJKFootpanel.MemoEditor(Index: Integer): TDBMemo;
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begin
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if Index< Length(MemoEditors) then Result := MemoEditors[Index]
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else Result := nil;
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end;
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// 内存的释放是要有顺序的！必须以创建的相反的顺序进行！尤其是当组件之间有父子关系时
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procedure TJKFootpanel.FreeEditors;
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begin
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if FScrollBox <> nil then
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begin
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comEditors := nil;
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edEditors := nil;
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MemoEditors := nil;
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FScrollBox.Free;
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FScrollBox := nil;
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end;
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end;
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procedure TJKFootpanel.AKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
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begin
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{
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if (Sender is TDBComboBox) then
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begin
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case Key of
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VK_Next: (Sender as TDBComboBox).DataSource.DataSet.Next;
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VK_PRIOR: (Sender as TDBComboBox).DataSource.DataSet.Prior;
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end;
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end
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else if (Sender is TDBedit) then
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begin
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case Key of
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VK_Next: (Sender as TDBedit).DataSource.DataSet.Next;
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VK_PRIOR: (Sender as TDBedit).DataSource.DataSet.Prior;
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end;
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end
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else if (Sender is TDBMemo) then
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begin
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case Key of
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VK_Next: (Sender as TDBMemo).DataSource.DataSet.Next;
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VK_PRIOR: (Sender as TDBMemo).DataSource.DataSet.Prior;
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end;
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end;
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}
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end;
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end.
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