mirror of
https://github.com/danieleteti/delphimvcframework.git
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109 lines
2.6 KiB
ObjectPascal
109 lines
2.6 KiB
ObjectPascal
// *************************************************************************** }
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//
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// LoggerPro
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//
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// Copyright (c) 2010-2024 Daniele Teti
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//
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// https://github.com/danieleteti/loggerpro
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//
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// ***************************************************************************
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// ***************************************************************************
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unit LoggerPro.VCLMemoAppender;
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interface
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uses
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LoggerPro,
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System.Classes,
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Vcl.StdCtrls;
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type
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{ @abstract(Appends formatted @link(TLogItem) to a TMemo in a VCL application) }
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TVCLMemoLogAppender = class(TLoggerProAppenderBase)
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private
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FMemo: TMemo;
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FMaxLogLines: Word;
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FClearOnStartup: Boolean;
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public
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constructor Create(aMemo: TMemo; aMaxLogLines: Word = 100; aClearOnStartup: Boolean = False; aLogItemRenderer: ILogItemRenderer = nil); reintroduce;
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procedure Setup; override;
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procedure TearDown; override;
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procedure WriteLog(const aLogItem: TLogItem); override;
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end;
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implementation
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uses
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System.SysUtils,
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Winapi.Windows,
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Winapi.Messages;
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{ TVCLMemoLogAppender }
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constructor TVCLMemoLogAppender.Create(aMemo: TMemo; aMaxLogLines: Word; aClearOnStartup: Boolean; aLogItemRenderer: ILogItemRenderer);
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begin
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inherited Create(aLogItemRenderer);
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FMemo := aMemo;
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FMaxLogLines := aMaxLogLines;
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FClearOnStartup := aClearOnStartup;
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end;
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procedure TVCLMemoLogAppender.Setup;
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begin
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inherited;
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if FClearOnStartup then
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begin
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TThread.Synchronize(nil,
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procedure
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begin
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FMemo.Clear;
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end);
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end;
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end;
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procedure TVCLMemoLogAppender.TearDown;
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begin
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// do nothing
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end;
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procedure TVCLMemoLogAppender.WriteLog(const aLogItem: TLogItem);
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var
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lText: string;
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begin
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if Assigned(FMemo) then
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begin
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if FMemo.owner = nil then exit;
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end;
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lText := FormatLog(aLogItem);
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TThread.Queue(nil,
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procedure
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begin
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FMemo.Lines.BeginUpdate;
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try
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if FMemo.Lines.Count = FMaxLogLines then
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FMemo.Lines.Delete(0);
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FMemo.Lines.Add(lText)
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finally
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FMemo.Lines.EndUpdate;
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end;
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SendMessage(FMemo.Handle, EM_SCROLLCARET, 0, 0);
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end);
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end;
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end.
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