如何使列表框与Outlook 2013相同？

Question

在Delphi XE2或XE3中,如何创建类似于Outlook 2013电子邮件列表的列表框？

或者是Outlook 2013中的列表还有其他什么？

如何在Delphi XE2或XE3中实现类似的？

谢谢

Answer 1

你可以用a TListView和ListGroups.做类似的事情.有使用的例子ListGroups中德尔福文档(链接XE4,但在XE2以及XE3也有效).它没有为您提供您正在寻找的图像,但它演示了使用它们,您应该能够从那里获取它.

(请注意,下面的代码不是该链接的代码的直接复制/粘贴,因为该代码有错误和遗漏.我已经更正,编译并运行它以在将其发布到此处之前修复它们.)

在新的VCL表单应用程序上删除TListView和TImageList.更改TImageListto 的名称DigitsLetters,然后将以下代码添加到表单中(像往常一样在Object Inspector中创建FormCreate和FormDestroy,并将代码粘贴到事件处理程序中,只需将声明添加GetImageFromAscii到private表单声明的部分) :

procedure TForm1.FormCreate(Sender: TObject);
var
  Group: TListGroup;
  ListItem: TListItem;
  Image: TBitmap;
  c: Char;
begin
  { align the list view to the form }
  ListView1.Align := alClient;

  { center and stretch the form to fit the screen }
  Self.Position := poScreenCenter;
  Self.Height := 600;
  Self.Width := 800;

  {
  change the view style of the list view
  such that the icons are displayed
  }
  ListView1.ViewStyle := vsIcon;

  { enable group view }
  ListView1.GroupView := True;

  { create a 32 by 32 image list }
  DigitsLetters := TImageList.CreateSize(32, 32);

  {
  generate the DigitsLetters image list with the digits,
  the small letters and the capital letters
  }
  GetImagesFromASCII('0', '9');
  GetImagesFromASCII('a', 'z');
  GetImagesFromASCII('A', 'Z');

  {
  add an empty image to the list
  used to emphasize the top and bottom descriptions
  of the digits group
  }
  Image := TBitmap.Create;
  Image.Height := 32;
  Image.Width := 32;
  DigitsLetters.Add(Image, nil);
  Image.Destroy;

  { create a title image for the small letters category }
  Image := TBitmap.Create;
  Image.Height := 32;
  Image.Width := 32;
  Image.Canvas.Brush.Color := clYellow;
  Image.Canvas.FloodFill(0, 0, clYellow, fsBorder);
  Image.Canvas.Font.Name := 'Times New Roman';
  Image.Canvas.Font.Size := 14;
  Image.Canvas.Font.Color := clRed;
  Image.Canvas.TextOut(3, 5, 'a..z');
  DigitsLetters.Add(Image, nil);
  Image.Destroy;

  { create a title image for the capital letters category }
  Image := TBitmap.Create;
  Image.Height := 32;
  Image.Width := 32;
  Image.Canvas.Brush.Color := clYellow;
  Image.Canvas.FloodFill(0, 0, clYellow, fsBorder);
  Image.Canvas.Font.Name := 'Times New Roman';
  Image.Canvas.Font.Size := 13;
  Image.Canvas.Font.Color := clRed;
  Image.Canvas.TextOut(2, 5, 'A..Z');
  DigitsLetters.Add(Image, nil);
  Image.Destroy;

  { associate the image list with the list view }
  ListView1.LargeImages := DigitsLetters;
  ListView1.GroupHeaderImages := DigitsLetters;

  { set up the digits group }
  Group := ListView1.Groups.Add;
  Group.State := [lgsNormal, lgsCollapsible];
  Group.Header := 'Digits';
  Group.HeaderAlign := taCenter;
  Group.Footer := 'End of the Digits category';
  Group.FooterAlign := taCenter;
  Group.Subtitle := 'The digits from 0 to 9';

  {
  use the empty image as the title image
  to emphasize the top and bottom descriptions
  }
  Group.TitleImage := DigitsLetters.Count - 3;

  { create the actual items in the digits group }
  for c := '0' to '9' do
  begin
    // add a new item to the list view
    ListItem := ListView1.Items.Add;

    // ...customize it
    ListItem.Caption := c + ' digit';
    ListItem.ImageIndex := Ord(c) - Ord('0');

    // ...and associate it with the digits group
    ListItem.GroupID := Group.GroupID;
  end;

  { set up the small letters group }
  Group := ListView1.Groups.Add;
  Group.State := [lgsNormal, lgsCollapsible];
  Group.Header := 'Small Letters';
  Group.HeaderAlign := taRightJustify;
  Group.Footer := 'End of the Small Letters category';
  Group.FooterAlign := taLeftJustify;
  Group.Subtitle := 'The small letters from ''a'' to ''z''';
  Group.TitleImage := DigitsLetters.Count - 2;

  { create the actual items in the small letters group }
  for c := 'a' to 'z' do
  begin
    // add a new item to the list view
    ListItem := ListView1.Items.Add;

    // ...customize it
    ListItem.Caption := 'letter ' + c;
    ListItem.ImageIndex := Ord(c) - Ord('a') + 10;

    // ...and associate it with the small letters group
    ListItem.GroupID := Group.GroupID;
  end;

  {
  to see how the NextGroupID property can be used,
  the following lines of code show how an item can be associated
  with a group ID, prior to creating the group
  }

  { create the actual items in the capital letters group }
  for c := 'A' to 'Z' do
  begin
    // add a new item to the list view
    ListItem := ListView1.Items.Add;

    // ...customize it
    ListItem.Caption := 'letter ' + c;
    ListItem.ImageIndex := Ord(c) - Ord('A') + 36;

    // ...and associate it with the capital letters group
    ListItem.GroupID := ListView1.Groups.NextGroupID;
  end;

  { set up the capital letters group }
  Group := ListView1.Groups.Add;
  Group.State := [lgsNormal, lgsCollapsible];
  Group.Header := 'Capital Letters';
  Group.HeaderAlign := taRightJustify;
  Group.Footer := 'End of the Capital Letters category';
  Group.FooterAlign := taLeftJustify;
  Group.Subtitle := 'The capital letters from ''A'' to ''Z''';
  Group.TitleImage := DigitsLetters.Count - 1;

end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  { remove the image list from memory }
  DigitsLetters.Destroy;
end;

{
Generates a series of images for the characters
starting with ASCII code First and ending with Last.
All images are added to the DigitsLetters variable.
}
procedure TForm1.GetImagesFromASCII(First, Last: Char);
var
  Image: TBitmap;
  c: Char;
begin
  for c := First to Last do
  begin
    Image := TBitmap.Create;
    Image.Height := 32;
    Image.Width := 32;
    Image.Canvas.Font.Name := 'Times New Roman';
    Image.Canvas.Font.Size := 22;
    Image.Canvas.TextOut((Image.Width - Image.Canvas.TextWidth(c)) div 2, 0, c);
    DigitsLetters.Add(Image, nil);
    Image.Destroy;
  end;
end;

结果(显示为Digits和Small Letters组折叠):