要實現Delphi的ListView分頁顯示,可以按照以下步驟進行操作:
下面是一個簡單的示例代碼:
unit MainForm;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ComCtrls, StdCtrls;
type
TMainForm = class(TForm)
ListView1: TListView;
ComboBox1: TComboBox;
ButtonPrev: TButton;
ButtonNext: TButton;
procedure FormCreate(Sender: TObject);
procedure ComboBox1Change(Sender: TObject);
procedure ButtonPrevClick(Sender: TObject);
procedure ButtonNextClick(Sender: TObject);
private
FData: TStringList;
FPageSize: Integer;
FTotalPages: Integer;
FCurrentPage: Integer;
procedure UpdateListView;
procedure UpdatePager;
public
{ Public declarations }
end;
var
MainForm: TMainForm;
implementation
{$R *.dfm}
procedure TMainForm.FormCreate(Sender: TObject);
var
I: Integer;
begin
FPageSize := 10;
FCurrentPage := 1;
FData := TStringList.Create;
for I := 1 to 100 do
FData.Add('Item ' + IntToStr(I));
ListView1.Columns.Add.Caption := 'Items';
UpdateListView;
UpdatePager;
end;
procedure TMainForm.ComboBox1Change(Sender: TObject);
begin
FPageSize := StrToIntDef(ComboBox1.Text, 10);
FCurrentPage := 1;
UpdateListView;
UpdatePager;
end;
procedure TMainForm.ButtonPrevClick(Sender: TObject);
begin
if FCurrentPage > 1 then
begin
Dec(FCurrentPage);
UpdateListView;
UpdatePager;
end;
end;
procedure TMainForm.ButtonNextClick(Sender: TObject);
begin
if FCurrentPage < FTotalPages then
begin
Inc(FCurrentPage);
UpdateListView;
UpdatePager;
end;
end;
procedure TMainForm.UpdateListView;
var
I, StartIndex, EndIndex: Integer;
begin
ListView1.Clear;
StartIndex := (FCurrentPage - 1) * FPageSize;
EndIndex := StartIndex + FPageSize - 1;
if EndIndex >= FData.Count then
EndIndex := FData.Count - 1;
for I := StartIndex to EndIndex do
begin
with ListView1.Items.Add do
begin
Caption := FData[I];
end;
end;
end;
procedure TMainForm.UpdatePager;
begin
FTotalPages := Ceil(FData.Count / FPageSize);
ButtonPrev.Enabled := FCurrentPage > 1;
ButtonNext.Enabled := FCurrentPage < FTotalPages;
end;
end.
以上代碼實現了一個簡單的ListView分頁顯示的Delphi程序。通過ComboBox選擇每頁顯示的數據條數,通過按鈕切換上一頁和下一頁。根據當前頁的起始索引和結束索引,從數據源中取出對應的數據,并更新到ListView中。同時,根據總頁數和當前頁數,更新上一頁按鈕和下一頁按鈕的Enabled屬性。