Delphi 右键单击'；t更新TControlList中的ItemIndex

我已将

TPopupMenu

添加到

t控制列表

，右键单击时，项目索引不会更新以反映单击的项目。有没有一种方法可以使右键单击做出与左键单击类似的响应

---

如果用户右键单击某个特定项目，PopupMenu将与该项目关联，而不是与当前关注的项目关联，这将非常好。

您可以使用OnPopupMenu事件中的HotItemIndex属性，并将其保存到变量中。然后，对于弹出菜单项事件，您可以使用它

示例代码：

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    ControlList1: TControlList;
    PopupMenu1: TPopupMenu;
    TestPopupMnu: TMenuItem;
    Label1: TLabel;
    Memo1: TMemo;
    procedure ControlList1BeforeDrawItem(AIndex: Integer; ACanvas: TCanvas; ARect:
        TRect; AState: TOwnerDrawState);
    procedure ControlList1Click(Sender: TObject);
    procedure TestPopupMnuClick(Sender: TObject);
    procedure PopupMenu1Popup(Sender: TObject);
  private
    FPopupItemIndex : Integer;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.ControlList1BeforeDrawItem(AIndex: Integer; ACanvas: TCanvas;
    ARect: TRect; AState: TOwnerDrawState);
begin
    Label1.Caption := AIndex.ToString;
end;

procedure TForm1.ControlList1Click(Sender: TObject);
begin
    Memo1.Lines.Add('Clicked item ' + ControlList1.ItemIndex.ToString);
end;

procedure TForm1.TestPopupMnuClick(Sender: TObject);
begin
    Memo1.Lines.Add('Test PopupMenu item ' + FPopupItemIndex.ToString);
end;

procedure TForm1.PopupMenu1Popup(Sender: TObject);
begin
    FPopupItemIndex := ControlList1.HotItemIndex;
end;

end.

表格本身：

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 299
  ClientWidth = 635
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object ControlList1: TControlList
    Left = 24
    Top = 20
    Width = 317
    Height = 200
    ItemCount = 5
    ItemMargins.Left = 0
    ItemMargins.Top = 0
    ItemMargins.Right = 0
    ItemMargins.Bottom = 0
    ParentColor = False
    PopupMenu = PopupMenu1
    TabOrder = 0
    OnBeforeDrawItem = ControlList1BeforeDrawItem
    OnClick = ControlList1Click
    object Label1: TLabel
      Left = 92
      Top = 20
      Width = 31
      Height = 13
      Caption = 'Label1'
    end
  end
  object Memo1: TMemo
    Left = 368
    Top = 24
    Width = 241
    Height = 201
    Lines.Strings = (
      'Memo1')
    TabOrder = 1
  end
  object PopupMenu1: TPopupMenu
    OnPopup = PopupMenu1Popup
    Left = 436
    Top = 128
    object TestPopupMnu: TMenuItem
      Caption = 'Test'
      OnClick = TestPopupMnuClick
    end
  end
end

---

您可以使用OnPopupMenu事件中的HotItemIndex属性并将其保存到变量中。然后，对于弹出菜单项事件，您可以使用它

示例代码：

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    ControlList1: TControlList;
    PopupMenu1: TPopupMenu;
    TestPopupMnu: TMenuItem;
    Label1: TLabel;
    Memo1: TMemo;
    procedure ControlList1BeforeDrawItem(AIndex: Integer; ACanvas: TCanvas; ARect:
        TRect; AState: TOwnerDrawState);
    procedure ControlList1Click(Sender: TObject);
    procedure TestPopupMnuClick(Sender: TObject);
    procedure PopupMenu1Popup(Sender: TObject);
  private
    FPopupItemIndex : Integer;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.ControlList1BeforeDrawItem(AIndex: Integer; ACanvas: TCanvas;
    ARect: TRect; AState: TOwnerDrawState);
begin
    Label1.Caption := AIndex.ToString;
end;

procedure TForm1.ControlList1Click(Sender: TObject);
begin
    Memo1.Lines.Add('Clicked item ' + ControlList1.ItemIndex.ToString);
end;

procedure TForm1.TestPopupMnuClick(Sender: TObject);
begin
    Memo1.Lines.Add('Test PopupMenu item ' + FPopupItemIndex.ToString);
end;

procedure TForm1.PopupMenu1Popup(Sender: TObject);
begin
    FPopupItemIndex := ControlList1.HotItemIndex;
end;

end.

表格本身：

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 299
  ClientWidth = 635
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object ControlList1: TControlList
    Left = 24
    Top = 20
    Width = 317
    Height = 200
    ItemCount = 5
    ItemMargins.Left = 0
    ItemMargins.Top = 0
    ItemMargins.Right = 0
    ItemMargins.Bottom = 0
    ParentColor = False
    PopupMenu = PopupMenu1
    TabOrder = 0
    OnBeforeDrawItem = ControlList1BeforeDrawItem
    OnClick = ControlList1Click
    object Label1: TLabel
      Left = 92
      Top = 20
      Width = 31
      Height = 13
      Caption = 'Label1'
    end
  end
  object Memo1: TMemo
    Left = 368
    Top = 24
    Width = 241
    Height = 201
    Lines.Strings = (
      'Memo1')
    TabOrder = 1
  end
  object PopupMenu1: TPopupMenu
    OnPopup = PopupMenu1Popup
    Left = 436
    Top = 128
    object TestPopupMnu: TMenuItem
      Caption = 'Test'
      OnClick = TestPopupMnuClick
    end
  end
end

---

要处理右键单击，您必须使用

OnMouseDown

或

OnMouseUp

事件，而不是

OnClick

事件

与只检测鼠标左键点击的

OnClick

事件不同，

OnMouseDown

和

onmousedup

事件能够检测所有鼠标点击（左键、右键、中键）

---

要处理右键单击，您必须使用

OnMouseDown

或

OnMouseUp

事件，而不是

OnClick

事件

与只检测鼠标左键点击的

OnClick

事件不同，

OnMouseDown

和

onmousedup

事件能够检测所有鼠标点击（左键、右键、中键）

---

HotItemIndex

属性可用于通过使用以下命令检测右键单击了哪个项目

procedure TListingList.clListingsMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  inherited;
  if Button <> mbRight then
    Exit;

  if clListings.HotItemIndex <> -1 then
    clListings.ItemIndex := clListings.HotItemIndex;
end;

procedure TListingList.clListingsMouseDown（发送方：TObject；按钮：TMouseButton；Shift:TShiftState；X，Y：整数）；
开始
继承；
如果按钮亮了那么
出口
如果clListings.HotItemIndex为-1，则
clListings.ItemIndex:=clListings.HotItemIndex；
终止

---

这基本上是可行的，但是如果您已经有了一个可见的

tpopumenu

，那么

HotItemIndex

就是

-1

。这意味着连续的右键点击不会弹出正确的项目-但我可以接受这一点。我认为需要使用

MousePosToItemIndex

或

ItemIndexUnderMouse

方法来正确修复此问题。

可以使用

HotItemIndex

属性通过使用以下命令来检测右键单击了哪个项目

procedure TListingList.clListingsMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  inherited;
  if Button <> mbRight then
    Exit;

  if clListings.HotItemIndex <> -1 then
    clListings.ItemIndex := clListings.HotItemIndex;
end;

procedure TListingList.clListingsMouseDown（发送方：TObject；按钮：TMouseButton；Shift:TShiftState；X，Y：整数）；
开始
继承；
如果按钮亮了那么
出口
如果clListings.HotItemIndex为-1，则
clListings.ItemIndex:=clListings.HotItemIndex；
终止

---

这基本上是可行的，但是如果您已经有了一个可见的

tpopumenu

，那么

HotItemIndex

就是

-1

。这意味着连续的右键点击不会弹出正确的项目-但我可以接受这一点。我认为需要使用

MousePosToItemIndex

或

ItemIndexUnderMouse

方法来正确修复此问题。

您可能需要引入类似的新属性。要实现这一点，只需处理

WM_CONTEXTMENU

中的选择更改。您可能需要引入类似的新属性。要实现这一点，只需处理

WM_CONTEXTMENU

中的选择更改即可。我认为使用HotItemIndex属性就是我想要的after@Alister那么请将我的答案标记为已接受。我认为使用HotItemIndex属性就是我想要的after@Alister那么请把我的回答标记为已接受。