delphi - ListViewItem 的文本对齐方式

Question

在 Delphi 10.4 的 Firemonkey 中。我想构建一个列表视图，其中列表视图项文本显示为左对齐或右对齐，具体取决于列表项内容。

我这样做如下：

procedure TForm1.FormCreate(Sender: TObject);

  procedure AddItem(No: integer);
  var
    Item: TListViewItem;
  begin
    Item := ListView1.Items.AddItem(No);
    Item.Text := 'Text item No ' + No.ToString;
    Item.Tag := No;
    if No mod 2 = 0 then
      Item.Objects.TextObject.TextAlign := TTextAlign.Leading
    else
      Item.Objects.TextObject.TextAlign := TTextAlign.Trailing;
  end;

var
  c: integer;
begin
  for c := 0 to 9 do
    AddItem(c);
end;

但是，这并不适用于所有平台。但是一旦 ListView 改变了它的大小，所有的 ListItems 都会在左边出现。有一个更好的方法吗？

作为一种解决方法，我做了以下事情：

procedure TForm1.ListView1Resized(Sender: TObject);
var
  c: integer;
begin
  for c := 0 to ListView1.ItemCount - 1  do
    if ListView1.Items[c].Tag mod 2 = 0 then
      ListView1.Items[c].Objects.TextObject.TextAlign := TTextAlign.Leading
    else
      ListView1.Items[c].Objects.TextObject.TextAlign := TTextAlign.Trailing;
end;

标签： delphifiremonkeytlistview

Answer 1

这个ItemAppearance=ListItem问题无法解决，因为在内部ResetView方法中，Item.Objects.TextObject所有属性都会写回ItemAppearanceObjects.ItemObjects.

因此，ItemAppearance必须DynamicAppearance为此应用程序设置为。必须在Structure View下TextObjectAppearance手动创建两个对象，其中必须设置为a和to 。ListView.ItemAppearance.ItemText1TextAlign=LeadingText2TextAlign=Trailing

之后，只需用文本填充一个文本对象：

procedure TForm1.FormCreate(Sender: TObject);

  procedure AddItem(No: integer);
  var
    Item: TListViewItem;
  begin
    Item := ListView1.Items.AddItem(No);
    if No mod 2 = 0 then
      Item.Data['Text1'] := 'Text item No ' + No.ToString
    else
      Item.Data['Text2'] := 'Text item No ' + No.ToString
  end;

var
  c: integer;
begin
  for c := 0 to 9 do
    AddItem(c);
end;

这是相应的 FMX 文件：

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 480
  ClientWidth = 640
  FormFactor.Width = 320
  FormFactor.Height = 480
  FormFactor.Devices = [Desktop]
  OnCreate = FormCreate
  DesignerMasterStyle = 0
  object ListView1: TListView
    ItemAppearanceClassName = 'TDynamicAppearance'
    ItemEditAppearanceClassName = 'TDynamicAppearance'
    HeaderAppearanceClassName = 'TListHeaderObjects'
    FooterAppearanceClassName = 'TListHeaderObjects'
    Align = Client
    Size.Width = 640.000000000000000000
    Size.Height = 480.000000000000000000
    Size.PlatformDefault = False
    TabOrder = 0
    ItemAppearanceObjects.ItemObjects.ObjectsCollection = <
      item
        AppearanceObjectName = 'Text1'
        AppearanceClassName = 'TTextObjectAppearance'
        Appearance.TextAlign = Leading
      end
      item
        AppearanceObjectName = 'Text2'
        AppearanceClassName = 'TTextObjectAppearance'
        Appearance.TextAlign = Trailing
      end>
    ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = <
      item
        AppearanceObjectName = 'Text1'
        AppearanceClassName = 'TTextObjectAppearance'
      end>
  end
end