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372 lines
8.7 KiB
C
372 lines
8.7 KiB
C
/* An OLIT menubar widget, by Chuck Thompson <cthomp@cs.uiuc.edu>
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Copyright (C) 1993 Lucid, Inc.
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This file is part of the Lucid Widget Library.
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The Lucid Widget Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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The Lucid Widget Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <X11/IntrinsicP.h>
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#include <X11/Intrinsic.h>
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#include <X11/CompositeP.h>
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#include <X11/Composite.h>
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#include "lwlib-Xol-mbP.h"
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#include "lwlib-Xol-mb.h"
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#define HORIZ_SPACING 4
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#define VERT_SPACING 4
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static void Initialize();
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static void Resize();
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static void ChangeManaged();
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static Boolean SetValues();
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static XtGeometryResult GeometryManager();
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static XtGeometryResult PreferredSize();
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static void do_layout();
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static XtGeometryResult try_layout();
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lwMenuBarClassRec lwMenubarClassRec =
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{
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{
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/* core_class members */
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(WidgetClass) &compositeClassRec, /* superclass */
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"Menubar", /* class_name */
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sizeof(lwMenuBarRec), /* widget_size */
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NULL, /* class_initialize */
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NULL, /* class_part_initialize */
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FALSE, /* class_inited */
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Initialize, /* initialize */
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NULL, /* initialize_hook */
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XtInheritRealize, /* realize */
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NULL, /* actions */
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0, /* num_actions */
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NULL, /* resources */
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0, /* num_resources */
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NULLQUARK, /* xrm_class */
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TRUE, /* compress_motion */
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XtExposeCompressMaximal, /* compress_exposure */
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TRUE, /* compress_enterleave */
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FALSE, /* visible_interest */
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NULL, /* destroy */
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Resize, /* resize */
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NULL, /* expose */
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NULL, /* set_values */
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NULL, /* set_values_hook */
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XtInheritSetValuesAlmost, /* set_values_almost */
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NULL, /* get_values_hook */
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NULL, /* accept_focus */
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XtVersion, /* version */
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NULL, /* callback_private */
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NULL, /* tm_table */
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PreferredSize, /* query_geometry */
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NULL, /* display_accelerator */
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NULL, /* extension */
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},
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{
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/* composite_class members */
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GeometryManager, /* geometry_manager */
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ChangeManaged, /* change_managed */
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XtInheritInsertChild, /* insert_child */
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XtInheritDeleteChild, /* delete_child */
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NULL, /* extension */
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},
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{
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/* Menubar class members */
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0, /* empty */
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}
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};
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WidgetClass lwMenubarWidgetClass = (WidgetClass) &lwMenubarClassRec;
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static void Initialize (request, new)
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lwMenuBarWidget request, new;
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{
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if (request->core.width <= 0)
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new->core.width = 1;
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if (request->core.height <= 0)
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new->core.height = 23;
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}
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static void
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Resize (w)
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lwMenuBarWidget w;
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{
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do_layout(w);
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}
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static void
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do_layout (parent)
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lwMenuBarWidget parent;
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{
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Widget child;
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int cnt;
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int managed_children = 0;
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int managed_width = 0;
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int new_pos = 0;
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/*
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* Determine number of children which will fit on one line.
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* For now we ignore the rest, making sure they are unmanaged.
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*/
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cnt = 0;
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while ((cnt < (int) parent->composite.num_children) &&
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(managed_width < (int) parent->core.width))
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{
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child = parent->composite.children[cnt++];
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managed_children++;
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managed_width += child->core.width + child->core.border_width * 2 +
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HORIZ_SPACING;
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}
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if (managed_width > (int) parent->core.width)
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managed_children--;
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/*
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* Correct positioning of children.
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*/
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cnt = 0;
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while (managed_children)
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{
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child = parent->composite.children[cnt++];
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if (!child->core.managed)
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XtManageChild (child);
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if ((child->core.x != new_pos) || (child->core.y != 0))
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XtMoveWidget (child, new_pos, 0);
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new_pos += child->core.width + child->core.border_width * 2 +
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HORIZ_SPACING;
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managed_children--;
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}
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/*
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* Make sure all remaining children are unmanaged.
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*/
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while (cnt < parent->composite.num_children)
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{
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child = parent->composite.children[cnt];
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if (child->core.managed)
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XtUnmanageChild (child);
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if ((child->core.x != parent->core.width) ||
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(child->core.y != parent->core.height))
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XtMoveWidget (child, parent->core.width, parent->core.height);
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cnt++;
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}
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}
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static XtGeometryResult
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PreferredSize (w, request, preferred)
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lwMenuBarWidget w;
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XtWidgetGeometry *request, *preferred;
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{
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Widget child;
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int cnt;
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/*
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* If no changes are being made to the width or height, just agree.
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*/
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if (!(request->request_mode & CWWidth) &&
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!(request->request_mode & CWHeight))
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return (XtGeometryYes);
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/*
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* Right now assume everything goes in one row. Calculate the
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* minimum required width and height.
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*/
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preferred->width = 0;
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preferred->height = 0;
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for (cnt = 0; cnt < w->composite.num_children; cnt++)
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{
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child = w->composite.children[cnt];
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if (child->core.managed)
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{
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preferred->width += child->core.width + child->core.border_width*2 +
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HORIZ_SPACING;
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if (preferred->height < (Dimension) (child->core.height +
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child->core.border_width * 2))
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preferred->height = child->core.height +
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child->core.border_width * 2;
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}
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}
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preferred->request_mode = CWWidth | CWHeight;
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/*
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* Case: both height and width requested
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*/
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if ((request->request_mode & CWWidth) &&
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(request->request_mode & CWHeight))
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{
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/*
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* Ok if same or bigger.
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*/
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if (preferred->width <= request->width &&
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preferred->height <= request->height)
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{
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preferred->width = request->width;
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return (XtGeometryYes);
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}
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/*
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* If both dimensions are too small, say no.
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*/
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else
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if (preferred->width > request->width &&
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preferred->height > request->height)
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return (XtGeometryNo);
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/*
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* Otherwise one must be right, so say almost.
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*/
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else
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return (XtGeometryAlmost);
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}
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/*
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* If only one dimension is requested, either its OK or it isn't.
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*/
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else
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{
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if (request->request_mode & CWWidth)
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{
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if (preferred->width <= request->width)
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{
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preferred->width = request->width;
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return (XtGeometryYes);
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}
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else
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return (XtGeometryNo);
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}
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else if (request->request_mode & CWHeight)
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{
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if (preferred->height <= request->height)
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{
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return (XtGeometryYes);
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}
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else
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return (XtGeometryNo);
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}
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return (XtGeometryYes);
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}
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}
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static XtGeometryResult
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GeometryManager (w, request, reply)
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Widget w;
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XtWidgetGeometry *request;
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XtWidgetGeometry *reply;
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{
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lwMenuBarWidget parent = (lwMenuBarWidget) w->core.parent;
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/*
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* If the widget wants to move, just say no.
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*/
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if ((request->request_mode & CWX && request->x != w->core.x) ||
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(request->request_mode & CWY && request->y != w->core.y))
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return (XtGeometryNo);
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/*
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* Since everything "fits" for now, grant all requests.
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*/
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if (request->request_mode & CWWidth)
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w->core.width = request->width;
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if (request->request_mode & CWHeight)
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w->core.height = request->height;
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if (request->request_mode & CWBorderWidth)
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w->core.border_width = request->border_width;
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do_layout (parent);
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return (XtGeometryYes);
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}
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static XtGeometryResult
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try_layout (parent)
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lwMenuBarWidget parent;
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{
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Widget child;
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int cnt;
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int managed_children = 0;
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int managed_width = 0;
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int new_pos = 0;
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/*
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* Determine number of children which will fit on one line.
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* For now we ignore the rest, making sure they are unmanaged.
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*/
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cnt = 0;
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while ((cnt < (int) parent->composite.num_children) &&
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(managed_width < (int) parent->core.width))
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{
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child = parent->composite.children[cnt++];
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if (child->core.managed)
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{
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managed_children++;
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managed_width += child->core.width + child->core.border_width * 2 +
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HORIZ_SPACING;
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}
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}
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if (managed_width > (int) parent->core.width)
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return (XtGeometryNo);
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else
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return (XtGeometryYes);
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}
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static void
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ChangeManaged (w)
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lwMenuBarWidget w;
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{
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XtGeometryResult result;
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result = try_layout (w);
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if (result != XtGeometryYes)
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{
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XtUnmanageChild (w->composite.children[w->composite.num_children - 1]);
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XtMoveWidget (w->composite.children[w->composite.num_children-1],
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w->core.width, w->core.height);
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}
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do_layout (w);
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}
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