delphi - 如何在 Delphi 中将 TPageControl 选项卡分解为单独的文件？

Question

我有一个 VCL 表单，上面有五个选项卡 TPageControl。每个 TTabSheet 的内容都相当不相关，并且有很多单独的控件和处理逻辑...所以我想将其分解，以便更容易处理“仅该选项卡”的代码。有一行像

//-------------------------- begin rules tab methods -------------------

只是不再削减它了。真的，我想我想以某种方式将每个选项卡放在一个单独的文件中。

目前我正在考虑为每个 TTabPage 创建一个 VCL 框架。如果我这样做，我要么需要将所有框架加载到构造函数中的 TPageControl 中，要么在显示选项卡时加载。

这是一个好方法吗？为每个选项卡制作一个完整的 TForm 会更好吗？我应该继续将选项卡包装在 TPageControl 中，还是应该将其更改为 TTabControl(如果内容是动态加载的)？如果这是一个好方法，那么在启动时加载所有选项卡更好，还是每次显示选项卡时加载更好？ (如果不完全明显的话，也许优点/缺点在大多数/所有情况下哪个更好)

Answer 1

您可以使用框架或表单。

• 对于 Frames，您必须添加 TabControl 作为每个 Frame 的父级。
• 有了表单，您就有 to dock每个表单到 PageControl(表单标题将自动成为 TabControl 标题)。

<小时/>

procedure TMyForm.AddPage( AFormClass : TFormClass );
var
  LForm : TForm;
begin
  LForm := AFormClass.Create( Self );
  LForm.ManualDock( PageControl1, nil, alClient );
  LForm.Show;
end;

<小时/>

示例

创建基本设置表单

unit UI_Form_SettingBase;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs;

type
  TUISettingBase_Form = class( TForm )
  private

  protected
    procedure DoSaveData; virtual;
  public
    function CanSaveData : Boolean; virtual;
    procedure SaveData;
  end;

  TUISettingBase_FormClass = class of TUISettingBase_Form;

var
  UISettingBase_Form : TUISettingBase_Form;

implementation

{$R *.dfm}
{ TUISettingBase_Form }

function TUISettingBase_Form.CanSaveData : Boolean;
begin
  Result := True;
end;

procedure TUISettingBase_Form.DoSaveData;
begin

end;

procedure TUISettingBase_Form.SaveData;
begin
  if CanSaveData
  then
    DoSaveData;
end;

end.

从该表单派生所有设置表单并覆盖 DoSaveData 和可选的 CanSaveData 方法

通用设置(带有简单的复选框)

unit UI_Form_SettingCommon;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, UI_Form_SettingBase, Vcl.StdCtrls;

type
  TUISettingCommon_Form = class(TUISettingBase_Form)
    CheckBox1: TCheckBox;
  private

  protected
    procedure DoSaveData; override;
  public

  end;

var
  UISettingCommon_Form: TUISettingCommon_Form;

implementation

{$R *.dfm}

procedure TUISettingCommon_Form.DoSaveData;
begin
  inherited;
  // code to save the data
end;

end.

连接设置(使用简单的编辑控件)

unit UI_Form_SettingConnection;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, UI_Form_SettingBase, Vcl.StdCtrls;

type
  TUISettingConnection_Form = class( TUISettingBase_Form )
    Edit1 : TEdit;
  private
  protected
    procedure DoSaveData; override;
  public
  end;

var
  UISettingConnection_Form : TUISettingConnection_Form;

implementation

{$R *.dfm}
{ TUISettingConnection_Form }

procedure TUISettingConnection_Form.DoSaveData;
begin
  inherited;
  // code to save the data
end;

end.

将各个部分放在一起:真正的设置表单

主要的设置表单也源自SettingBase

unit UI_Form_Settings;

interface

uses
  System.Generics.Collections,
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, UI_Form_SettingBase, Vcl.StdCtrls,
  Vcl.ExtCtrls, Vcl.ComCtrls;

type
  TUISettings_Form = class( TUISettingBase_Form )
    PageControl1 : TPageControl;
    Panel1 : TPanel;
    Save_Button : TButton;
  private
    FForms : TList<TUISettingBase_Form>;
    procedure AddSettingPage( ASettingFormClass : TUISettingBase_FormClass );
  protected
    procedure DoSaveData; override;
  public
    function CanSaveData : Boolean; override;
    procedure AfterConstruction; override;
    procedure BeforeDestruction; override;
  end;

var
  UISettings_Form : TUISettings_Form;

implementation

{$R *.dfm}

uses
  UI_Form_SettingCommon, UI_Form_SettingConnection;
{ TUISettings_Form }

procedure TUISettings_Form.AddSettingPage( ASettingFormClass : TUISettingBase_FormClass );
var
  LForm : TUISettingBase_Form;
begin
  LForm := ASettingFormClass.Create( Self );
  try
    LForm.ManualDock( PageControl1, nil, alClient );
    LForm.Show;
    FForms.Add( LForm );
    LForm := nil;
  finally
    LForm.Free;
  end;
end;

procedure TUISettings_Form.AfterConstruction;
begin
  inherited;
  FForms := TList<TUISettingBase_Form>.Create;
  // add all the setting forms
  AddSettingPage( TUISettingCommon_Form );
  AddSettingPage( TUISettingConnection_Form );
end;

procedure TUISettings_Form.BeforeDestruction;
begin
  inherited;
  FForms.Free;
end;

function TUISettings_Form.CanSaveData : Boolean;
var
  LForm : TUISettingBase_Form;
begin
  // iterate all setting forms if they can save the data
  Result := True;
  for LForm in FForms do
    Result := Result and LForm.CanSaveData;
end;

procedure TUISettings_Form.DoSaveData;
var
  LForm : TUISettingBase_Form;
begin
  inherited;
  // iterate all setting forms and save the data
  for LForm in FForms do
    LForm.SaveData;
end;

end.