PtExtentWidget

Gamma/Photon: Using Gamma™ with the Photon microGUIŽ, Version 4.0
Prev |  | Next

# `PtExtentWidget`

`PtExtentWidget` -- forces a widget to calculate its extent.

## Syntax

    PtExtentWidget (widget)

## Arguments

`widget`

  The widget that will calculate its extent.

## Returns

t if successful.

## Description

This function forces the `widget` to calculate its extent. When calculating its extent, a widget will resize itself to contain all of its children.

## Example

This example, `ex_PtExtentWidget.g`, is included in the `gamma_ph_`#`_examples_1_QNX4.tgz` file available on the Cogent Web Site.

    #!/usr/cogent/bin/phgamma

    /*
    This example draws many buttons on the screen.
    The PtExtentWidget function is used to make sure
    the window can hold all of the widgets.
    */

    require_lisp("PhotonWidgets");
    PtInit(nil);
    win = new(PtWindow);
    win.resize_flags = Pt_RESIZE_X_ALWAYS | Pt_RESIZE_Y_ALWAYS;
    PtRealizeWidget(win);

    but_array = make_array(0);
    for(i=0;i<100;i++)
    {
      but_array[i] = new(PtButton);
      but_array[i].text_string = "Button";
      but_array[i].SetPos((i * 10) % 640 , (i * 10) % 480);
      PtRealizeWidget(but_array[i]);
      PtExtentWidget(win);
      flush_events();
      nanosleep(0,50000000);
    }

    for(i=99;i>=0;i --)
    {
      PtDestroyWidget(but_array[i]);
      PtExtentWidget(win);
      flush_events();
      nanosleep(0,50000000);
    }
    PtMainLoop();

## See Also

In Photon documentation: PtDestroyWidget.

Prev | Home | Next
`PtEventHandler` | Up | `PtFindDisjoint`

Copyright 1995-2002 by Cogent Real-Time Systems, Inc.