154 lines
4.1 KiB
ObjectPascal
154 lines
4.1 KiB
ObjectPascal
{******************************************************************
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JEDI-VCL Demo
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Copyright (C) 2002 Project JEDI
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Original author:
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Contributor(s):
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You may retrieve the latest version of this file at the JEDI-JVCL
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home page, located at http://jvcl.sourceforge.net
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The contents of this file are used with permission, subject to
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the Mozilla Public License Version 1.1 (the "License"); you may
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not use this file except in compliance with the License. You may
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obtain a copy of the License at
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http://www.mozilla.org/MPL/MPL-1_1Final.html
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Software distributed under the License is distributed on an
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"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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implied. See the License for the specific language governing
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rights and limitations under the License.
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******************************************************************}
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{$I jvcl.inc}
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unit main;
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interface
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uses
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Windows, Messages, SysUtils, {$IFDEF COMPILER6_UP}Variants, {$ENDIF} Classes, Graphics, Controls, Forms,
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Dialogs, JvUIB, JVUIBMetaData, StdCtrls, ComCtrls, Menus, ExtCtrls,
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JvComponent;
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type
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TMainForm = class(TForm)
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DataBase: TJvUIBDataBase;
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Transaction: TJvUIBTransaction;
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TreeView: TTreeView;
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Memo: TMemo;
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MainMenu: TMainMenu;
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mFile: TMenuItem;
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Open: TMenuItem;
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SaveToFile1: TMenuItem;
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LoadFromFile1: TMenuItem;
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OpenDialog: TOpenDialog;
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SaveDialog: TSaveDialog;
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Splitter: TSplitter;
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procedure OpenClick(Sender: TObject);
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procedure FormCreate(Sender: TObject);
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procedure FormDestroy(Sender: TObject);
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procedure TreeViewChange(Sender: TObject; Node: TTreeNode);
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procedure SaveToFile1Click(Sender: TObject);
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procedure LoadFromFile1Click(Sender: TObject);
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private
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{ Private declarations }
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procedure ShowNodes(node: TMetaNode; Parent: TTreeNode);
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public
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{ Public declarations }
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end;
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var
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MainForm: TMainForm;
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MetaData: TMetaDataBase;
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implementation
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uses Math;
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{$R *.dfm}
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procedure TMainForm.ShowNodes(node: TMetaNode; Parent: TTreeNode);
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var
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i, j: Integer;
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ClassNode: TTreeNode;
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begin
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Parent := TreeView.Items.AddChild(Parent, node.Name);
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Parent.Data := Node;
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for i := 0 to node.NodeCount - 1 do
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if node.Nodes[i].Childs.Count > 0 then
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begin
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ClassNode := TreeView.Items.AddChild(Parent, node.Nodes[i].ClassID.NodeClass
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+ format(': %s(%d)', [node.Nodes[i].ClassID.ClassName, node.Nodes[i].Childs.Count]));
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for j := 0 to node.Nodes[i].Childs.Count - 1 do
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ShowNodes(TMetaNode(node.Nodes[i].Childs[j]), ClassNode);
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end;
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end;
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procedure TMainForm.OpenClick(Sender: TObject);
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begin
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if OpenDialog.Execute then
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begin
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DataBase.Connected := false;
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TreeView.Items.Clear;
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DataBase.DatabaseName := OpenDialog.FileName;
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MetaData.LoadFromDatabase(Transaction);
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end;
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ShowNodes(MetaData, nil);
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end;
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procedure TMainForm.FormCreate(Sender: TObject);
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begin
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MetaData := TMetaDataBase.Create(nil, 0);
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end;
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procedure TMainForm.FormDestroy(Sender: TObject);
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begin
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MetaData.Free;
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end;
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procedure TMainForm.TreeViewChange(Sender: TObject; Node: TTreeNode);
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begin
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If (node.Data <> nil) then
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memo.Lines.Text := TMetaNode(Node.Data).AsDDL else
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memo.Lines.Text := '';
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end;
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procedure TMainForm.SaveToFile1Click(Sender: TObject);
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var FileStream: TFileStream;
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begin
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if SaveDialog.Execute then
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begin
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FileStream := TFileStream.Create(SaveDialog.FileName, fmCreate);
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try
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MetaData.SaveToStream(FileStream);
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finally
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FileStream.Free;
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end;
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end;
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end;
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procedure TMainForm.LoadFromFile1Click(Sender: TObject);
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var FileStream: TFileStream;
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begin
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OpenDialog.FileName := SaveDialog.FileName;
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if OpenDialog.Execute then
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begin
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TreeView.Items.Clear;
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FileStream := TFileStream.Create(OpenDialog.FileName, fmOpenRead);
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try
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MetaData.Free;
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MetaData := TMetaDataBase.CreateFromStream(nil, -1, FileStream);
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ShowNodes(MetaData, nil);
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finally
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FileStream.Free;
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end;
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end;
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end;
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end.
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