我发现有关如何创建 delphi 组件的教程很好,但它们只使用现有组件之一作为继承操作的对象。像这样的东西
unit CountBtn;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ExtCtrls;
type
TCountBtn = class(TButton)
private
FCount: integer;
protected
procedure Click;override;
public
procedure ShowCount;
published
property Count:integer read FCount write FCount;
constructor Create(aowner:Tcomponent); override;
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('Mihan Components', [TCountBtn]);
end;
constructor TCountBtn.Create(aowner:Tcomponent);
begin
inherited create(Aowner);
end;
procedure Tcountbtn.Click;
begin
inherited click;
FCount:=FCount+1;
end;
procedure TCountBtn.ShowCount;
begin
Showmessage('On button '+ caption+' you clicked: '+inttostr(FCount)+' times');
end;
end.
但是如果我需要使用很少元素的组件该怎么办?可以说,我得到了Button
and Edit
场地。在按钮上单击编辑字段中应该显示与按钮上相同的文本。我开始这样做,但似乎它不会像我想要的那样工作:
unit TestComp;
interface
uses
System.SysUtils, System.Classes, Vcl.Controls, Vcl.StdCtrls, Vcl.ExtCtrls;
type
TUiCompU = class(TCustomControl)
private
{ Private declarations }
FButton: TButton;
FEdit: TEdit;
protected
{ Protected declarations }
procedure Paint; override;
//wrong!
procedure FButton.Click;override
public
{ Public declarations }
constructor Create(AOwner: TComponent); override;
published
{ Published declarations }
//wrong!
property ButtonText: String read FButton.Caption write FButton.Caption;
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('Ui', [TUiCompU]);
end;
{ TUiCompU }
constructor TUiCompU.Create(AOwner: TComponent);
begin
inherited;
Width := 200;
Height := 50;
FButton := TButton.Create(Self);
FButton.SetSubComponent(True);
FButton.Parent := Self;
FButton.Top := 8;
FButton.Left := 50;
FButton.Width := 35;
FButton.Name := 'Button';
FEdit := TEdit.Create(Self);
FEdit.SetSubComponent(True);
FEdit.Parent := Self;
FEdit.Top := 8;
FEdit.Left := 84;
FEdit.Width := 121;
FEdit.Name := 'Edit';
end;
procedure TUiCompU.Paint;
begin
Canvas.Rectangle(ClientRect);
end;
end.
这里应该如何添加Click
程序中,点击按钮的具体步骤是什么?是否有关于如何使用其他组件制作良好组件的良好教程? (顺便说一句,我需要创建类似幻灯片组件的东西)。
谢谢你,对不起我的英语。