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{******************************************************************************}

unit CnObjInspectorEnhancements;
{ |<PRE>
================================================================================
* 软件名称：CnPack IDE 专家包
* 单元名称：对象查看器扩展单元
* 单元作者：周劲羽 (zjy@cnpack.org)
* 备    注：
* 开发平台：PWin2000Pro + Delphi 5.01
* 兼容测试：
* 本 地 化：该单元中的字符串支持本地化处理方式
* 单元标识：$Id$
* 修改记录：2004.5.15 chinbo(shenloqi)
*               支持setelement的粗体显示
*           2003.10.31
*               注释了无效的枚举元素的加粗
*           2003.10.27
*               基本实现了D5下的加粗功能（D6,D7需要采用其他的方法）
*           2003.10.27
*               实现属性编辑器方法挂接核心技术
================================================================================
|</PRE>}

interface

{$I CnWizards.inc}

{$IFDEF CNWIZARDS_CNOBJINSPECTORENHANCEWIZARD}

{$IFDEF COMPILER6_UP}
  'Error: This wizard can used only for Delphi/C++ Builder 5.'
{$ENDIF COMPILER6_UP}

uses
  Windows, SysUtils, Classes, Graphics, IniFiles, TypInfo,
{$IFDEF COMPILER6_UP}
  DesignIntf, DesignEditors, VCLEditors,
{$ELSE}
  DsgnIntf,
{$ENDIF}
  CnConsts, CnWizClasses, CnWizConsts, CnWizMethodHook;

type
  TCnObjInspectorEnhanceWizard = class(TCnIDEEnhanceWizard)
  private
    procedure HookPropEditor;
    procedure UnhookPropEditor;
  protected
    function GetHasConfig: Boolean; override;
    procedure SetActive(Value: Boolean); override;
  public
    constructor Create; override;
    destructor Destroy; override;

    class procedure GetWizardInfo(var Name, Author, Email, Comment: string); override;
    procedure LoadSettings(Ini: TCustomIniFile); override;
    procedure SaveSettings(Ini: TCustomIniFile); override;
    procedure Config; override;
  end;

{$ENDIF CNWIZARDS_CNOBJINSPECTORENHANCEWIZARD}

implementation

{$IFDEF CNWIZARDS_CNOBJINSPECTORENHANCEWIZARD}

uses
  CnCommon;

type
  // 原属性编辑器绘制方法，因为原过程为对象方法，专家中使用普通过程来挂接，
  // 故定义一个 ASelf: TPropertyEditor 来返回对象实例
  TPropDrawProc = procedure (ASelf: TPropertyEditor; ACanvas: TCanvas;
    const ARect: TRect; ASelected: Boolean);

var
  OldPropDrawName: TPropDrawProc;
  OldPropDrawValue: TPropDrawProc;
  PropDrawNameHook: TCnMethodHook;
  PropDrawValueHook: TCnMethodHook;
  AllowHook: Boolean;

// 挂接 TPropertyEditor.PropDrawName 的方法
type
  THackPropertyEditor = class(TPropertyEditor);

procedure PropDrawName(ASelf: TPropertyEditor; ACanvas: TCanvas;
  const ARect: TRect; ASelected: Boolean);
begin
  if AllowHook and (ASelf.PropCount > 0) then
  begin
    // 调试期 PropCount = 0 时访问 GetPropType 出错
    if (THackPropertyEditor(ASelf).GetPropType.Kind in [tkClass]) and
      (not (paSubProperties in ASelf.GetAttributes)) and
      (not (paDialog in ASelf.GetAttributes)) and
      (paValueList in ASelf.GetAttributes) then
      ACanvas.Font.Color := clMaroon;
  end;

  // 调用原来的方法
  PropDrawNameHook.UnhookMethod;
  try
    OldPropDrawName(ASelf, ACanvas, ARect, ASelected);
  finally
    PropDrawNameHook.HookMethod;
  end;
end;

// 挂接 TPropertyEditor.PropDrawValue 的方法
procedure PropDrawValue(ASelf: TPropertyEditor; ACanvas: TCanvas;
  const ARect: TRect; ASelected: Boolean);
const
  tkOrdinal = [tkEnumeration, tkInteger, tkChar, tkWChar];

  function _ObjPropAllEqualDef(AObj: TObject): Boolean;
  var
    PropList: PPropList;
    Count, I: Integer;
  begin
    Result := True;
    try
      Count := GetPropList(AObj.ClassInfo, tkOrdinal, nil);
    except
      Exit;
    end;

    GetMem(PropList, Count * SizeOf(PPropInfo));
    try
      GetPropList(AObj.ClassInfo, tkOrdinal, PropList);
      for i := 0 to Count - 1 do
        if PropList[I].Default <> GetOrdProp(AObj, PropList[I]) then
        begin
          Result := False;
          Break;
        end;
    finally
      FreeMem(PropList);
    end;
  end;

var
  EnumInfo: PTypeInfo;
  dwDefault, dwValue: DWORD;
  dwbBit: TDWordBit;
begin
  if AllowHook and (ASelf.PropCount > 0) then
  begin
    // 不用IsStoredProp
    if not ASelected then
    begin

      if ASelf is TSetElementProperty then
      begin
        EnumInfo := GetTypeData(THackPropertyEditor(ASelf).GetPropType).CompType^;
        dwDefault := THackPropertyEditor(ASelf).GetPropInfo.Default;
        dwValue := THackPropertyEditor(ASelf).GetOrdValue;
        dwbBit := GetEnumValue(EnumInfo, TSetElementProperty(ASelf).GetName);
        if GetBit(dwDefault, dwbBit) <>
          GetBit(dwValue, dwbBit) then
        begin
          ACanvas.Font.Style := ACanvas.Font.Style + [fsBold];
        end
        else
          ACanvas.Font.Style := ACanvas.Font.Style - [fsBold];
      end
      else
      // TODO: 判断事件是不是继承的
      if ((THackPropertyEditor(ASelf).GetPropType.Kind in tkOrdinal) and
          (THackPropertyEditor(ASelf).GetOrdValue <> THackPropertyEditor(ASelf).GetPropInfo.default)) or
        ((THackPropertyEditor(ASelf).GetPropType.Kind in [tkFloat]) and
          (THackPropertyEditor(ASelf).GetFloatValue <> 0)) or
        ((THackPropertyEditor(ASelf).GetPropType.Kind in [tkString, tkLString, tkWString{$IFDEF UNICODE_STRING}, tkUString{$ENDIF}]) and
          (THackPropertyEditor(ASelf).GetStrValue <> '') and (THackPropertyEditor(ASelf).GetName <> 'Name')) or
        ((THackPropertyEditor(ASelf).GetPropType.Kind in [tkInt64]) and
          (THackPropertyEditor(ASelf).GetInt64Value <> THackPropertyEditor(ASelf).GetPropInfo.default)) or
        ((THackPropertyEditor(ASelf).GetPropType.Kind = tkClass) and
          (Pointer(THackPropertyEditor(ASelf).GetOrdValue) <> nil) and
          (not _ObjPropAllEqualDef(TObject(THackPropertyEditor(ASelf).GetOrdValue)))) or
        ((THackPropertyEditor(ASelf).GetPropType.Kind in [tkMethod]) and
          (THackPropertyEditor(ASelf).GetMethodValue.Code <> nil)) then
          ACanvas.Font.Style := ACanvas.Font.Style + [fsBold];
    end;
  end;

  // 调用原来的方法
  PropDrawValueHook.UnhookMethod;
  try
    OldPropDrawValue(ASelf, ACanvas, ARect, ASelected);
  finally
    PropDrawValueHook.HookMethod;
  end;
end;

{ TCnObjInspectorEnhanceWizard }

constructor TCnObjInspectorEnhanceWizard.Create;
begin
  inherited;
  HookPropEditor;
end;

destructor TCnObjInspectorEnhanceWizard.Destroy;
begin
  UnhookPropEditor;
  inherited;
end;

procedure TCnObjInspectorEnhanceWizard.HookPropEditor;
begin
  // 取得原有的属性编辑器绘制方法地址
  OldPropDrawName := GetBplMethodAddress(@TPropertyEditor.PropDrawName);
  OldPropDrawValue := GetBplMethodAddress(@TPropertyEditor.PropDrawValue);
  // 挂接属性编辑器绘制方法
  PropDrawNameHook := TCnMethodHook.Create(@OldPropDrawName, @PropDrawName);
  PropDrawValueHook := TCnMethodHook.Create(@OldPropDrawValue, @PropDrawValue);
end;

procedure TCnObjInspectorEnhanceWizard.UnhookPropEditor;
begin
  OldPropDrawName := nil;
  OldPropDrawValue := nil;
  FreeAndNil(PropDrawNameHook);
  FreeAndNil(PropDrawValueHook);
end;

procedure TCnObjInspectorEnhanceWizard.LoadSettings(Ini: TCustomIniFile);
begin
  inherited;
  { TODO : 装载设置 }
end;

procedure TCnObjInspectorEnhanceWizard.SaveSettings(Ini: TCustomIniFile);
begin
  inherited;
  { TODO : 保存设置 }
end;

procedure TCnObjInspectorEnhanceWizard.SetActive(Value: Boolean);
begin
  inherited;
  AllowHook := Value;
end;

procedure TCnObjInspectorEnhanceWizard.Config;
begin
  { TODO : 显示设置窗口 }
end;

function TCnObjInspectorEnhanceWizard.GetHasConfig: Boolean;
begin
  Result := False;
end;

class procedure TCnObjInspectorEnhanceWizard.GetWizardInfo(var Name,
  Author, Email, Comment: string);
begin
  Name := SCnObjInspectorEnhanceWizardName;
  Author := SCnPack_Zjy;
  Email := SCnPack_ZjyEmail;
  Comment := SCnObjInspectorEnhanceWizardComment;
end;

initialization
  RegisterCnWizard(TCnObjInspectorEnhanceWizard);

{$ENDIF CNWIZARDS_CNOBJINSPECTORENHANCEWIZARD}
end.
