FMX Delphi 10.2执行任务时显示表单或请等待面板
我有几个任务在按钮点击 例如FMX Delphi 10.2执行任务时显示表单或请等待面板,delphi,firemonkey,delphi-10.2-tokyo,Delphi,Firemonkey,Delphi 10.2 Tokyo,我有几个任务在按钮点击 例如 显示表单或请稍候面板 从数据库加载数据(持续5-10秒) 清除所有TEdit字段 隐藏表单或请等待面板 ShowMessage('已完成') 是否可能在点击按钮后显示“请等待”面板或窗体,并在所有操作完成后隐藏该面板 如何同步逐个执行任务 或任何其他简单的解决方案。这是一个创建“占位符”的简单示例,如下所示: procedure TForm1.FormCreate(Sender: TObject); begin TTask.Run(procedure
或任何其他简单的解决方案。这是一个创建“占位符”的简单示例,如下所示:
procedure TForm1.FormCreate(Sender: TObject);
begin
TTask.Run(procedure
var
arr: array [0..1] of ITask;
begin
TThread.Synchronize(nil, procedure
begin
Rectangle1.Visible := true;
Rectangle1.BringToFront;
end);
arr[0] := TTask.Run(procedure
begin
//load data from the database
end);
arr[1] := TTask.Run(procedure
begin
//something else
end);
//this call is blocking but you are calling this in a worker thread!
//your UI won't freeze and at the end you'll see the message appearing
TTask.WaitForAll(arr);
TThread.Synchronize(nil, procedure
begin
Rectangle1.Visible := false;
ShowMessage('Finish!');
end);
end);
end;
矩形有黑色背景,包含与中心对齐的布局
;在里面你可以找到一个标签(与顶部对齐)和一个弧形(与客户端对齐)。代码如下:
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 418
ClientWidth = 490
FormFactor.Width = 320
FormFactor.Height = 480
FormFactor.Devices = [Desktop]
OnCreate = FormCreate
DesignerMasterStyle = 0
object Rectangle1: TRectangle
Align = Client
Fill.Color = xFF222222
Size.Width = 490.000000000000000000
Size.Height = 418.000000000000000000
Size.PlatformDefault = False
Visible = False
object Layout1: TLayout
Align = Center
Size.Width = 170.000000000000000000
Size.Height = 102.000000000000000000
Size.PlatformDefault = False
TabOrder = 0
object Label1: TLabel
Align = Top
StyledSettings = [Family, Size, Style]
Size.Width = 170.000000000000000000
Size.Height = 41.000000000000000000
Size.PlatformDefault = False
TextSettings.FontColor = claWhite
TextSettings.HorzAlign = Center
Text = 'Please wait'
TabOrder = 0
end
object Arc1: TArc
Align = Center
Size.Width = 50.000000000000000000
Size.Height = 50.000000000000000000
Size.PlatformDefault = False
Stroke.Color = claCoral
EndAngle = -90.000000000000000000
object FloatAnimation1: TFloatAnimation
Enabled = True
Duration = 1.000000000000000000
Loop = True
PropertyName = 'RotationAngle'
StartValue = 0.000000000000000000
StopValue = 360.000000000000000000
end
end
end
end
end
矩形的Visible
属性设置为False,这样您就不会立即看到矩形。请注意,我在arc组件中创建了一个动画,以便您可以看到它在旋转:
通过这种方式,可以模拟加载微调器。然后,我在表单的OnCreate
事件中添加了这段代码,作为如何执行此操作的示例
procedure TForm1.FormCreate(Sender: TObject);
begin
TTask.Run(procedure
begin
TThread.Synchronize(nil, procedure
begin
Rectangle1.Visible := true;
//Rectangle1.BringToFront;
// ^ call the above if needed, just to be sure
// that you'll always see the rectangle on screen
end);
Sleep(4000);
TThread.Synchronize(nil, procedure
begin
Rectangle1.Visible := false;
ShowMessage('Finish!');
end);
end);
end;
Sleep(4000)
模拟一个长任务,这段代码应该替换为您的任务。实际上,我会这样做:
procedure TForm1.FormCreate(Sender: TObject);
begin
TTask.Run(procedure
var
arr: array [0..1] of ITask;
begin
TThread.Synchronize(nil, procedure
begin
Rectangle1.Visible := true;
Rectangle1.BringToFront;
end);
arr[0] := TTask.Run(procedure
begin
//load data from the database
end);
arr[1] := TTask.Run(procedure
begin
//something else
end);
//this call is blocking but you are calling this in a worker thread!
//your UI won't freeze and at the end you'll see the message appearing
TTask.WaitForAll(arr);
TThread.Synchronize(nil, procedure
begin
Rectangle1.Visible := false;
ShowMessage('Finish!');
end);
end);
end;
当然,您应该将此代码放在ButtonClick中,而不是FormCreate事件处理程序中