更改 TListView TObjectAppearance 中的数字格式

Question

我将 TListView 与 TFDQuery 实时绑定。其中一个数据映射到 Item Detail，这基本上是一个数字。我希望将数字格式化为##,##0.00。查看 Object Inspector 没有属性我可以更改数据格式。

有什么方法可以更改 TListView 中数字的 ItemAppearance 吗？

显示 Object Inspector、Toogle Design 和 Debug 视图的屏幕截图下方：

FMX 程序：

unit Unit9;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs,
  FMX.ListView.Types, FMX.ListView.Appearances, FMX.ListView.Adapters.Base,
  FireDAC.Stan.Intf, FireDAC.Stan.Option, FireDAC.Stan.Error, FireDAC.UI.Intf,
  FireDAC.Phys.Intf, FireDAC.Stan.Def, FireDAC.Stan.Pool, FireDAC.Stan.Async,
  FireDAC.Phys, FireDAC.Phys.SQLite, FireDAC.Phys.SQLiteDef,
  FireDAC.Stan.ExprFuncs, FireDAC.FMXUI.Wait, FireDAC.Stan.Param, FireDAC.DatS,
  FireDAC.DApt.Intf, FireDAC.DApt, Data.Bind.EngExt, Fmx.Bind.DBEngExt,
  System.Rtti, System.Bindings.Outputs, Fmx.Bind.Editors, Data.Bind.Components,
  Data.Bind.DBScope, Data.DB, FireDAC.Comp.DataSet, FireDAC.Comp.Client,
  FMX.ListView, FMX.Controls.Presentation, FMX.StdCtrls, FMX.Edit;

type
  TForm9 = class(TForm)
    lbl1: TLabel;
    lsv1: TListView;
    con1: TFDConnection;
    qryLists: TFDQuery;
    bdr1: TBindSourceDB;
    bdl1: TBindingsList;
    tcf1: TLinkFillControlToField;
    lpfText: TLinkPropertyToField;
    qryInsert: TFDQuery;
    btn1: TButton;
    lnkcntrltfld1: TLinkControlToField;
    procedure btn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form9: TForm9;

implementation

{$R *.fmx}

procedure TForm9.btn1Click(Sender: TObject);
begin
  qryInsert.ParamByName('id').AsInteger := 1;
  qryInsert.ParamByName('cur_datetime').AsDateTime := now;
  qryInsert.ParamByName('name').AsString := 'sample';
  qryInsert.ParamByName('size_cont').AsString := 'size_cont';
  qryInsert.ParamByName('qty').AsFloat := 10;
  qryInsert.ParamByName('est_price').AsFloat := 1234.5;
  qryInsert.ParamByName('qty_price').AsString := '10 x 1234.5';
  qryInsert.ParamByName('estimate').AsFloat := 10 * 1234.5;
  qryInsert.ExecSQL;
  qryLists.Close;
  qryLists.Open();
end;

end.

FMX 文件：

object Form9: TForm9
  Left = 0
  Top = 0
  Caption = 'Form9'
  ClientHeight = 480
  ClientWidth = 308
  FormFactor.Width = 320
  FormFactor.Height = 480
  FormFactor.Devices = [Desktop]
  DesignerMasterStyle = 0
  object lbl1: TLabel
    Align = Top
    StyledSettings = [Family, Style, FontColor]
    Size.Width = 308.000000000000000000
    Size.Height = 33.000000000000000000
    Size.PlatformDefault = False
    TextSettings.Font.Size = 14.000000000000000000
    TextSettings.HorzAlign = Center
    Text = '1869'
    TabOrder = 0
  end
  object lsv1: TListView
    ItemAppearanceClassName = 'TImageListItemBottomDetailAppearance'
    ItemEditAppearanceClassName = 'TImageListItemBottomDetailShowCheckAppearance'
    HeaderAppearanceClassName = 'TListHeaderObjects'
    FooterAppearanceClassName = 'TListHeaderObjects'
    Align = Client
    Size.Width = 308.000000000000000000
    Size.Height = 407.000000000000000000
    Size.PlatformDefault = False
    TabOrder = 1
    ItemAppearanceObjects.ItemObjects.Text.Width = 201.000000000000000000
    ItemAppearanceObjects.ItemObjects.Text.Height = 20.000000000000000000
    ItemAppearanceObjects.ItemObjects.Text.PlaceOffset.Y = 1.000000000000000000
    ItemAppearanceObjects.ItemObjects.Detail.Width = 201.000000000000000000
    ItemAppearanceObjects.ItemObjects.Detail.Height = 20.000000000000000000
    ItemAppearanceObjects.ItemObjects.Detail.PlaceOffset.Y = 24.000000000000000000
  end
  object btn1: TButton
    Align = Bottom
    Position.Y = 440.000000000000000000
    Size.Width = 308.000000000000000000
    Size.Height = 40.000000000000000000
    Size.PlatformDefault = False
    TabOrder = 7
    Text = 'btn1'
    OnClick = btn1Click
  end
  object con1: TFDConnection
    Params.Strings = (
      
        'Database=D:\My Project Files. my_projects_aws-rest\project_x_v' +
        '0\application\client\database\smartcart.s3db'
      'LockingMode=Normal'
      'DriverID=SQLite')
    Connected = True
    LoginPrompt = False
    Left = 72
    Top = 24
  end
  object qryLists: TFDQuery
    Active = True
    Connection = con1
    SQL.Strings = (
      'SELECT id, date_created, name, size_cont, qty_price, estimate'
      'FROM lists ORDER BY date_created DESC')
    Left = 112
    Top = 24
  end
  object bdr1: TBindSourceDB
    DataSet = qryLists
    ScopeMappings = <>
    Left = 152
    Top = 24
  end
  object bdl1: TBindingsList
    Methods = <>
    OutputConverters = <>
    Left = 20
    Top = 5
    object tcf1: TLinkFillControlToField
      Category = 'Quick Bindings'
      Control = lsv1
      Track = True
      FillDataSource = bdr1
      AutoFill = True
      FillExpressions = <
        item
          SourceMemberName = 'estimate'
          ControlMemberName = 'Detail'
        end>
      FillHeaderExpressions = <>
      FillBreakGroups = <>
    end
    object lpfText: TLinkPropertyToField
      Category = 'Quick Bindings'
      DataSource = bdr1
      FieldName = 'estimate'
      Component = lbl1
      ComponentProperty = 'Text'
    end
    object lnkcntrltfld1: TLinkControlToField
      Category = 'Quick Bindings'
      DataSource = bdr1
      FieldName = 'estimate'
      Track = False
    end
  end
  object qryInsert: TFDQuery
    Connection = con1
    SQL.Strings = (
      'INSERT INTO lists (id, date_created, name, size_cont, '
      '                   qty, est_price, qty_price, estimate) '
      'VALUES (:id, :cur_datetime, :name, :size_cont, '
      '        :qty, :est_price, :qty_price, :estimate);')
    Left = 192
    Top = 24
    ParamData = <
      item
        Name = 'ID'
        DataType = ftInteger
        ParamType = ptInput
        Value = Null
      end
      item
        Name = 'CUR_DATETIME'
        DataType = ftDateTime
        ParamType = ptInput
        Value = Null
      end
      item
        Name = 'NAME'
        DataType = ftString
        ParamType = ptInput
        Value = Null
      end
      item
        Name = 'SIZE_CONT'
        DataType = ftString
        ParamType = ptInput
        Value = Null
      end
      item
        Name = 'QTY'
        DataType = ftFloat
        ParamType = ptInput
        Value = Null
      end
      item
        Name = 'EST_PRICE'
        DataType = ftFloat
        ParamType = ptInput
        Value = Null
      end
      item
        Name = 'QTY_PRICE'
        DataType = ftString
        ParamType = ptInput
        Value = Null
      end
      item
        Name = 'ESTIMATE'
        DataType = ftFloat
        ParamType = ptInput
        Value = Null
      end>
  end
end

Answer 1

有两种方法适用于这种情况：

在 TListView 级别 TLinkControlToField1 -> CustomFormat : "$ "+UpperCase(%s)。这是最适用的方法，因为数字保持其数字格式并且可以包含在计算中。您可能想知道 Uppercase 在这里做什么？它只是将数据显示 (%s) 为字符串，没有任何效果。
使用格式为 $ #,##0.00 的 TDataset 字段的 Display Format。在这种方法中，$ 将在您开始将此数字包含在计算中时产生错误。

你应该检查这个 link 以获得更详细的解释。

更改 TListView TObjectAppearance 中的数字格式

Change the Number Format in TListView TObjectAppearance

delphi

tlistview

firemonkey

livebindings