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Motif FAQ (Part 5 of 9)
Section - 129) How do I line up two columns of widgets of different types? I

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Top Document: Motif FAQ (Part 5 of 9)
Previous Document: 128) How can I center a widget in a form?
Next Document: 130) TOPIC: PUSHBUTTON WIDGET
See reader questions & answers on this topic! - Help others by sharing your knowledge
have a column of say label widgets, and a column of text widgets and I want to
have them lined up horizontally. The problem is that they are of different
heights. Just putting them in a form or rowcolumn doesn't line them up
properly because the label and text widgets are of different height.

If you want the geometry to look like this

  -------------------------------------
 |          -------------------------- |
 |a label  |Some text                 ||
 |          -------------------------- |
                   ------------------- |
 |a longer label  |Some more text     ||
 |                 ------------------- |
 |                    ---------------- |
 |a very long label  |Even more text  ||
 |                    ---------------- |
  -------------------------------------

try

/* Written by Dan Heller.  Copyright 1991, O'Reilly && Associates.
* This program is freely distributable without licensing fees and
* is provided without guarantee or warranty expressed or implied.
* This program is -not- in the public domain.  This program is
* taken from the Motif Programming Manual, O'Reilly Volume 6.
*/

/* text_form.c -- demonstrate how attachments work in Form widgets.
* by creating a text-entry form type application.
*/

#include <Xm/PushB.h>
#include <Xm/PushBG.h>
#include <Xm/LabelG.h>
#include <Xm/Text.h>
#include <Xm/Form.h>

char *prompts[] = {
"Name:", "Phone:", "Address:",
"City:", "State:", "Zip:",
};

main(argc, argv)
int argc;
char *argv[];
{
Widget toplevel, mainform, subform, label, text;
XtAppContext app;
char buf[32];
int i;

toplevel = XtVaAppInitialize(&app, "Demos", NULL, 0,
&argc, argv, NULL, NULL);

mainform = XtVaCreateWidget("mainform",
xmFormWidgetClass, toplevel,
NULL);

for (i = 0; i < XtNumber(prompts); i++) {
subform = XtVaCreateWidget("subform",
    xmFormWidgetClass,   mainform,
    /* first one should be attached for form */
    XmNtopAttachment,    i? XmATTACH_WIDGET : XmATTACH_FORM,
    /* others are attached to the previous subform */
    XmNtopWidget,        subform,
    XmNleftAttachment,   XmATTACH_FORM,
    XmNrightAttachment,  XmATTACH_FORM,
    NULL);
label = XtVaCreateManagedWidget(prompts[i],
    xmLabelGadgetClass,  subform,
    XmNtopAttachment,    XmATTACH_FORM,
    XmNbottomAttachment, XmATTACH_FORM,
    XmNleftAttachment,   XmATTACH_FORM,
    XmNalignment,        XmALIGNMENT_BEGINNING,
    NULL);
sprintf(buf, "text_%d", i);
text = XtVaCreateManagedWidget(buf,
    xmTextWidgetClass,   subform,
    XmNtopAttachment,    XmATTACH_FORM,
    XmNbottomAttachment, XmATTACH_FORM,
    XmNrightAttachment,  XmATTACH_FORM,
    XmNleftAttachment,   XmATTACH_WIDGET,
    XmNleftWidget,       label,
    NULL);
XtManageChild(subform);
}
/* Now that all the forms are added, manage the main form */
XtManageChild(mainform);

XtRealizeWidget(toplevel);
XtAppMainLoop(app);
}

If you resize horizontally it stretches the text widgets.  If you resize
vertically it leaves space under the bottom (if you don't resize, this is not
problem).

If you want the text widgets to be lined up on the left, as in

  ----------------------------------------
 |                    ------------------- |
 |          a label  |Some text          ||
 |                    ------------------- |
                      ------------------- |
 |   a longer label  |Some more text     ||
 |                    ------------------- |
 |                    ------------------- |
 |a very long label  |Even more text     ||
 |                    ------------------- |
  ----------------------------------------

try this

/* Written by Dan Heller.  Copyright 1991, O'Reilly && Associates.
* This program is freely distributable without licensing fees and
* is provided without guarantee or warranty expressed or implied.
* This program is -not- in the public domain.  This program is
* taken from the Motif Programming Manual, O'Reilly Volume 6.
*/

/* text_entry.c -- This demo shows how the RowColumn widget can be
* configured to build a text entry form.  It displays a table of
* right-justified Labels and Text widgets that extend to the right
* edge of the Form.
*/
#include <Xm/LabelG.h>
#include <Xm/RowColumn.h>
#include <Xm/Text.h>

char *text_labels[] = {
"Name:", "Phone:", "Address:", "City:", "State:", "Zip:",
};

main(argc, argv)
int argc;
char *argv[];
{
Widget toplevel, rowcol;
XtAppContext app;
char buf[8];
int i;

toplevel = XtVaAppInitialize(&app, "Demos", NULL, 0,
&argc, argv, NULL, NULL);

rowcol = XtVaCreateWidget("rowcolumn",
xmRowColumnWidgetClass, toplevel,
XmNpacking,        XmPACK_COLUMN,
XmNnumColumns,     XtNumber(text_labels),
XmNorientation,    XmHORIZONTAL,
XmNisAligned,      True,
XmNentryAlignment, XmALIGNMENT_END,
NULL);

/* simply loop thru the strings creating a widget for each one */
for (i = 0; i < XtNumber(text_labels); i++) {
XtVaCreateManagedWidget(text_labels[i],
    xmLabelGadgetClass, rowcol,
    NULL);
sprintf(buf, "text_%d", i);
XtVaCreateManagedWidget(buf,
    xmTextWidgetClass, rowcol,
    NULL);
}

XtManageChild(rowcol);
XtRealizeWidget(toplevel);
XtAppMainLoop(app);
}

This makes all objects exactly the same size.  It does not resize in nice
ways.

If you want the text widgets lined up on the left, and the labels to be the
size of the longest string, resizing nicely both horizontally and vertically,
as in

 -------------------------------------
|                    ---------------- |
|          a label  |Some text       ||
|                    ---------------- |
                     ---------------- |
|   a longer label  |Some more text  ||
|                    ---------------- |
|                    ---------------- |
|a very long label  |Even more text  ||
|                    ---------------- |
 -------------------------------------


Answer: Do this: to get the widgets lined up horizontally, use a form but
place the widgets using XmATTACH_POSITION.  In the example, attach the top of
the first label to the form, the bottomPosition to 33 (33% of the height).
Attach the topPosition of the second label to 33 and the bottomPosition to 66.
Attach the topPosition of the third label to 66 and the bottom of the label to
the form.  Do the same with the text widgets.

To get the label widgets lined up vertically, use the right attachment of
XmATTACH_OPPOSITE_WIDGET: starting from the one with the longest label, attach
widgets on the right to each other. In the example, attach the 2nd label to
the third, and the first to the second.  To get the text widgets lined up,
just attach them on the left to the labels.  To get the text in the labels
aligned correctly, use XmALIGNMENT_END for the XmNalignment resource.

/* geometry for label 2
*/
n = 0;
XtSetArg (args[n], XmNalignment, XmALIGNMENT_END); n++;
XtSetArg (args[n], XmNleftAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNbottomAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNtopAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNtopPosition, 66); n++;
XtSetValues (label[2], args, n);

/* geometry for label 1
*/
n = 0;
XtSetArg (args[n], XmNalignment, XmALIGNMENT_END); n++;
XtSetArg (args[n], XmNbottomAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNbottomPosition, 66); n++;
XtSetArg (args[n], XmNtopAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNtopPosition, 33); n++;
XtSetArg (args[n], XmNleftAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNrightAttachment, XmATTACH_OPPOSITE_WIDGET); n++;
XtSetArg (args[n], XmNrightWidget, label[2]); n++;
XtSetValues (label[1], args, n);

/* geometry for label 0
*/
n = 0;
XtSetArg (args[n], XmNalignment, XmALIGNMENT_END); n++;
XtSetArg (args[n], XmNbottomAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNbottomPosition, 33); n++;
XtSetArg (args[n], XmNtopAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNleftAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNrightAttachment, XmATTACH_OPPOSITE_WIDGET); n++;
XtSetArg (args[n], XmNrightWidget, label[1]); n++;
XtSetValues (label[0], args, n);

/* geometry for text 0
*/
n = 0;
XtSetArg (args[n], XmNtopAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNbottomAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNbottomPosition, 33); n++;
XtSetArg (args[n], XmNrightAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNleftAttachment, XmATTACH_WIDGET); n++;
XtSetArg (args[n], XmNleftWidget, label[0]); n++;
XtSetValues (text[0], args, n);

/* geometry for text 1
*/
XtSetArg (args[n], XmNtopAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNtopPosition, 33); n++;
XtSetArg (args[n], XmNbottomAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNbottomPosition, 66); n++;
XtSetArg (args[n], XmNrightAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNleftAttachment, XmATTACH_WIDGET); n++;
XtSetArg (args[n], XmNleftWidget, label[1]); n++;
XtSetValues (text[1], args, n);

/* geometry for text 2
*/
XtSetArg (args[n], XmNtopAttachment, XmATTACH_POSITION); n++;
XtSetArg (args[n], XmNtopPosition, 66); n++;
XtSetArg (args[n], XmNrightAttachment, XmATTACH_FORM); n++;
XtSetArg (args[n], XmNleftAttachment, XmATTACH_WIDGET); n++;
XtSetArg (args[n], XmNleftWidget, label[2]); n++;
XtSetArg (args[n], XmNbottomAttachment, XmATTACH_FORM); n++;
XtSetValues (text[2], args, n);


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Top Document: Motif FAQ (Part 5 of 9)
Previous Document: 128) How can I center a widget in a form?
Next Document: 130) TOPIC: PUSHBUTTON WIDGET

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Last Update March 27 2014 @ 02:11 PM