如何解决TTeeGrid在运行时创建时随着列数的增加而变慢
我正在由API提供的运行时创建TTeeGrid(TDataSet后代)。我注意到随着列数的增加,性能会下降。这意味着,创建TTeeGrid的时间越来越慢。
我在这里开发firemonkey应用程序,当达到20列或更多时,在iOS和Android中的性能非常明显。
这是我的代码:
procedure TformMain.btnCreateTeeGridClick(Sender: TObject);
begin
FreeAndNil(CanvassGrid); // delete the old grid
// create a new grid
CanvassGrid := TTeeGrid.Create(recCanvass);
With CanvassGrid do
begin
Parent := recCanvass;
Align := TAlignLayout.Client;
Margins.Top := 5;
Margins.Left := 5;
Margins.Right := 5;
Margins.Bottom := 5;
ScrollBars.Visible := True;
Header.Format.Font.Size := 11;
Cells.Format.Font.Size := 11;
TabOrder := 0;
ScrollBars.Visible := False;
end;
end;
有没有一种方法可以提高性能,或者我错过了代码中导致性能降低的某些事情?
更新1:示例重现性最小
FMX文件
object Form9: TForm9
Left = 0
Top = 0
Caption = 'MRE TeeGrid Runtime'#13#10
ClientHeight = 480
ClientWidth = 294
FormFactor.Width = 320
FormFactor.Height = 480
FormFactor.Devices = [Desktop]
DesignerMasterStyle = 0
object btn1: TButton
Align = Bottom
Position.Y = 440.000000000000000000
Size.Width = 294.000000000000000000
Size.Height = 40.000000000000000000
Size.PlatformDefault = False
TabOrder = 9
Text = 'CREATE TEEGRID'
OnClick = btn1Click
end
object aniSearchProcess: TAniIndicator
Position.X = 128.000000000000000000
Position.Y = 216.000000000000000000
end
object lyt1: TLayout
Align = Client
Size.Width = 294.000000000000000000
Size.Height = 440.000000000000000000
Size.PlatformDefault = False
TabOrder = 11
end
object cur1: TFDGUIxWaitCursor
Provider = 'FMX'
Left = 32
Top = 32
end
object dvr1: TFDPhyssqliteDriverLink
Left = 88
Top = 32
end
object con1: TFDConnection
Params.Strings = (
'DriverID=sqlite')
Connected = True
LoginPrompt = False
Left = 144
Top = 32
end
object loc1: TFDLocalsql
Connection = con1
Active = True
Left = 200
Top = 32
end
object rsc1: TRESTClient
Accept = 'application/json,text/plain; q=0.9,text/html;q=0.8,'
AcceptCharset = 'utf-8,*;q=0.8'
BaseURL =
'https://me6hwinr2k.execute-api.ap-southeast-1.amazonaws.com/v0/d' +
'bqueries?item-var=9&qty=25'
Params = <>
Left = 32
Top = 112
end
object rsq1: TRESTRequest
Client = rsc1
Params = <>
Response = rsp1
SynchronizedEvents = False
Left = 32
Top = 176
end
object rsp1: TRESTResponse
ContentType = 'application/json'
Left = 32
Top = 240
end
object rsd1: TRESTResponseDataSetAdapter
Active = True
Dataset = mtb1
FieldDefs = <>
Response = rsp1
Left = 32
Top = 304
end
object mtb1: TFDMemTable
Active = True
FieldDefs = <
item
Name = 'Category'
DataType = ftWideString
Size = 255
end
item
Name = 'ID'
DataType = ftWideString
Size = 255
end
item
Name = 'Item'
DataType = ftWideString
Size = 255
end
item
Name = 'Qty'
DataType = ftWideString
Size = 255
end
item
Name = 'Container'
DataType = ftWideString
Size = 255
end
item
Name = 'Size'
DataType = ftWideString
Size = 255
end
item
Name = 'Ex temporibus dolore consequatur.'
DataType = ftWideString
Size = 255
end
item
Name = 'Et cum aut est nostrum...'
DataType = ftWideString
Size = 255
end
item
Name = 'Sequi quibusdam eum.'
DataType = ftWideString
Size = 255
end>
IndexDefs = <>
FetchOptions.AssignedValues = [evMode]
FetchOptions.Mode = fmAll
ResourceOptions.AssignedValues = [rvSilentMode]
ResourceOptions.SilentMode = True
UpdateOptions.AssignedValues = [uvCheckrequired,uvAutoCommitUpdates]
UpdateOptions.Checkrequired = False
UpdateOptions.AutoCommitUpdates = True
StoreDefs = True
Left = 32
Top = 368
end
end
FMX程序
unit Main;
interface
uses
System.SysUtils,System.Types,System.UITypes,System.Classes,System.Variants,FMX.Types,FMX.Controls,FMX.Forms,FMX.Graphics,FMX.Dialogs,FireDAC.UI.Intf,FireDAC.FMXUI.Wait,FireDAC.Stan.ExprFuncs,FireDAC.Phys.sqliteDef,FireDAC.Stan.Intf,FireDAC.Stan.Option,FireDAC.Stan.Error,FireDAC.Phys.Intf,FireDAC.Stan.Def,FireDAC.Stan.Pool,FireDAC.Stan.Async,FireDAC.Phys,FireDAC.Phys.sqlite,Data.DB,FireDAC.Stan.Param,FireDAC.DatS,FireDAC.DApt.Intf,REST.Types,FMX.Controls.Presentation,FMX.StdCtrls,FireDAC.Comp.DataSet,FireDAC.Comp.Client,REST.Response.Adapter,REST.Client,Data.Bind.Components,Data.Bind.ObjectScope,FireDAC.Phys.sqliteVDataSet,FireDAC.Comp.UI,FMXTee.Control,FMXTee.Grid,FMX.Layouts;
type
TForm9 = class(TForm)
cur1: TFDGUIxWaitCursor;
dvr1: TFDPhyssqliteDriverLink;
con1: TFDConnection;
loc1: TFDLocalsql;
rsc1: TRESTClient;
rsq1: TRESTRequest;
rsp1: TRESTResponse;
rsd1: TRESTResponseDataSetAdapter;
mtb1: TFDMemTable;
btn1: TButton;
aniSearchProcess: TAniIndicator;
lyt1: TLayout;
procedure btn1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form9: TForm9;
tgd1: TTeeGrid;
implementation
{$R *.fmx}
procedure TForm9.btn1Click(Sender: TObject);
var
i,CanvassItemId,e : Integer;
begin
aniSearchProcess.Visible := True;
aniSearchProcess.Enabled := True;
{$IFDEF MSWINDOWS}
Application.ProcessMessages;
{$ENDIF}
{$IF DEFINED(iOS) or DEFINED(ANDROID)}
Application.HandleMessage;
{$ENDIF}
FreeAndNil(tgd1); //free old grid
//create new grid
tgd1 := TTeeGrid.Create(lyt1);
With tgd1 do
begin
Parent := lyt1;
Align := TAlignLayout.Client;
Margins.Top := 5;
Margins.Left := 5;
Margins.Right := 5;
Margins.Bottom := 5;
ScrollBars.Visible := True;
Header.Format.Font.Size := 11;
Cells.Format.Font.Size := 11;
TabOrder := 0;
ScrollBars.Visible := False;
end;
con1.StartTransaction;
try
//define the API here for duplicate/update,initial click and subsequent clicks
rsc1.BaseURL := ...;
rsq1.Execute;
rsd1.Active := True;
mtb1.Active;
tgd1.DataSource := mtb1;
tgd1.Enabled := True;
// adjust the column properties dynamically
with tgd1 do
begin
for i := 0 to Columns.Count -1 do
begin
if i = 0 then
begin
Columns[i].Visible := False; // category column
end
else if (i = 1) then
begin
Columns[i].Visible := False; // id column
end
else if (i = 2) then
begin
Columns[i].Width.Value := 120; // item column
end
else if (i = 3) then
begin
Columns[i].Width.Value := 30; // qty column
end
else if (i = 4) then
begin
Columns[i].Width.Value := 50; // container column
end
else if (i = 5) then
begin
Columns[i].Width.Value := 50; // size column
end
else
begin
Columns[i].Width.Value := 50; // subsequent random columns
end;
end;
end;
finally
con1.Commit;
end;
aniSearchProcess.Visible := False;
aniSearchProcess.Enabled := False;
{$IFDEF MSWINDOWS}
Application.ProcessMessages;
{$ENDIF}
{$IF DEFINED(iOS) or DEFINED(ANDROID)}
Application.HandleMessage;
{$ENDIF}
end;
end.
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