Delphi Tips

How to add components to forms at run time  

It's easy and fun to create setup 
components at design time, but if 
you must, it's not difficult to 
create them at run time as well. 

For example, let's say you want to 
create a "TLabel" object called 
"Label1" with the caption "hello, world!" at run 
time and place it on your form at (50, 60) 
x and y coordinates: 

// assuming: your form is called "Form1"
//
with TLabel.Create( Form1 ) do
begin
  Parent  := Form1;  // this is important
  Left    := 50;     // X coordinate
  Top     := 60;     // Y coordinate
  Caption := 'hello, world';

  //
  // set your other parameters here...
  //
  // you don't have to set the Name
  // parameter, but...
  //
  Name    := 'Label1';

  //
  // finally make it visible
  //
  Visible := True;
end;

//The same example, this time using a variable to 
//keep track of the "TLabel" component:

var
  l : TLabel;

begin
  //
  // assuming: your form is called "Form1"
  //
  l := TLabel.Create( Form1 );

  l.Parent  := Form1;  // this is important
  l.Left    := 50;     // X coordinate
  l.Top     := 60;     // Y coordinate
  l.Caption := 'hello, world';

  //
  // set your other parameters here...
  //

  //
  // you don't have to set the Name
  // parameter, but...
  //
  l.Name    := 'Label1';

  //
  // finally make it visible
  //
  l.Visible := True;
end;

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