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El objeto Controls - Small Basic

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El objeto Controls en Small Basic
Materia: Práctica de Laboratorio II

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El objeto Controls - Small Basic

  1. 1. Microsoft® Small Basic El Objeto Controls Tiempo estimado para completar esta lección: 1 hora
  2. 2. El objeto Controls En esta lección, aprenderás cómo: Utilizar las distintas propiedades del objeto Controls. Utilizar varias operaciones del objeto Controls. Utiliza los eventos control en los botones y cuadros de texto en tu programa.
  3. 3. Introducción al objeto Controls Hasta ahora, has aprendido a utilizar diferentes objetos en Small Basic, como los objetos GraphicsWindow, Shapes, File y Math. Esta lección presenta el objeto Controls que ofrece Small Basic. Con este objeto, puedes mostrar controles simples, tales como cuadros de texto y botones, en la ventana gráfica.
  4. 4. Operaciones del objeto Controls Antes de crear un programa mediante el objeto Controls, vamos a aprender acerca de algunas operaciones del objeto Controls y sus parámetros. AddTextBox—Puedes definir un cuadro de texto que aparecerá en la ventana gráfica mediante el uso de esta operación. Como parámetros, debe especificar la coordenada x y la coordenada y de la caja de texto. AddButton—Puedes definir un botón que aparecerá en la ventana gráfica mediante el uso de esta operación. Como parámetros, se deben especificar el título del botón, su coordenada x y su coordenada y.
  5. 5. Operaciones del objeto Controls GetButtonCaption—Mediante esta operación, puedes recuperar el título de un botón. Debes especificar el nombre del botón como parámetro. SetButtonCaption—Mediante esta operación, puedes establecer o cambiar el título de un botón. Debes especificar el nombre de la tecla y el nuevo título como parámetros. GetTextBoxText—Puedes recuperar el texto que aparece en un cuadro de texto especificando su nombre como un parámetro para esta operación. SetTextBoxText—Puedes definir el texto que aparece en un cuadro de texto especificando su nombre y el texto requerido como parámetros para esta operación.
  6. 6. Operaciones del objeto Controls Además de agregar controles útiles en tu programa, puedes realizar determinadas operaciones y definir los ajustes de los controles que se agregan. Vamos a explorar el objeto Controls con la ayuda de un ejemplo. Haga clic en de la barra de herramientas.
  7. 7. Propiedades y Operaciones del objeto Controls Echemos un vistazo a las capacidades de las operaciones y propiedades que ofrece el objeto Controls. HideControl—Puedes utilizar esta operación para ocultar un control existente de la ventana gráfica. ShowControl—Puedes utilizar esta operación para mostrar un control previamente oculto en la ventana gráfica. Remove—Puedes utilizar esta operación para eliminar un control de la ventana gráfica.
  8. 8. Propiedades y Operaciones del objeto Controls SetSize—Puedes especificar un tamaño fijo para un control mediante el uso de esta operación. Debes especificar el nombre, altura y anchura del control como parámetros. Move—Puedes mover un control a una posición diferente en la ventana gráfica mediante el uso de esta operación. Debes especificar el nombre, la coordenada izquierda y coordenada superior del control como parámetros. LastClickedButton—Puedes utilizar esta operación para encontrar el último botón que hizo clic en la ventana gráfica. LastTypedTextBox—Puedes utilizar esta operación para encontrar el último cuadro de texto donde fue escrito el texto.
  9. 9. El objeto Controls Ahora vamos a escribir un programa sencillo que incluye el objeto Controls. Este programa muestra las definiciones de una palabra dada.
  10. 10. Eventos de Controls Ahora que estás familiarizado con el objeto Controls en Small Basic, vamos a presentar los eventos que puedes utilizar para ese objeto. Los eventos de Controls pueden generar acciones en tu programa cuando el usuario hace clic en un botón o tipea algún texto en un cuadro de texto. ButtonClicked provoca un evento cuando el usuario hace clic en un botón. TextTyped provoca un evento cuando el usuario escribe texto en un cuadro de texto. Puedes utilizar el evento ButtonClicked para hacer una simple calculadora como la que aparece a la derecha: Y aquí está un ejemplo del evento TextTyped:
  11. 11. Vamos a resumir… ¡Felicidades! Ahora ya sabes cómo: Usar las distintas propiedades del objeto Controls. Usar varias operaciones del objeto Controls. Usar los eventos de control en los botones y cuadros de texto en tu programa.
  12. 12. Demuestra lo que sabes Escribe un programa de apariencia simple y que realice los siguientes pasos:  Agregar cuadros de texto para solicitar el nombre, dirección, número de teléfono y correo electrónico del usuario.  Agregar un botón Enviar en el formulario.  Después de que el usuario especifica la información y haga clic en Enviar, se mostrará un mensaje apropiado a su criterio.

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