109 lines
3.9 KiB
Groff
109 lines
3.9 KiB
Groff
.\" Copyright 1993 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be
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.\" included in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw XtAdd-Grab wid-get
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.na
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.TH XtAddGrab __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtAddGrab, XtRemoveGrab \- redirect user input to a modal widget
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.SH SYNTAX
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#include <X11/Intrinsic.h>
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.HP
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void XtAddGrab(Widget \fIw\fP, Boolean \fIexclusive\fP, Boolean
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\fIspring_loaded\fP);
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.HP
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void XtRemoveGrab(Widget \fIw\fP);
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.SH ARGUMENTS
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.IP \fIexclusive\fP 1i
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Specifies whether user events should be dispatched exclusively to this widget
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or also to previous widgets in the cascade.
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.IP \fIspring_loaded\fP 1i
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Specifies whether this widget was popped up because the user pressed
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a pointer button.
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.IP \fIw\fP 1i
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Specifies the widget to add to or remove from the modal cascade.
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.SH DESCRIPTION
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The
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.B XtAddGrab
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function appends the widget (and associated parameters) to the modal cascade
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and checks that exclusive is
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.B True
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if spring_loaded is
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.BR True .
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If these are not
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.BR True ,
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.B XtAddGrab
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generates an error.
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.LP
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The modal cascade is used by
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.B XtDispatchEvent
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when it tries to dispatch a user event.
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When at least one modal widget is in the widget cascade,
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.B XtDispatchEvent
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first determines if the event should be delivered.
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It starts at the most recent cascade entry and follows the cascade up to and
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including the most recent cascade entry added with the exclusive parameter
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.BR True .
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.LP
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This subset of the modal cascade along with all descendants of these widgets
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comprise the active subset.
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User events that occur outside the widgets in this subset are ignored
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or remapped.
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Modal menus with submenus generally add a submenu widget to the cascade
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with exclusive
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.BR False .
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Modal dialog boxes that need to restrict user input to the most deeply nested
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dialog box add a subdialog widget to the cascade with exclusive
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.BR True .
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User events that occur within the active subset are delivered to the
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appropriate widget, which is usually a child or further descendant of the modal
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widget.
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.LP
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Regardless of where on the screen they occur,
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remap events are always delivered to the most recent widget in the active
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subset of the cascade that has spring_loaded
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.BR True ,
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if any such widget exists.
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.LP
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The
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.B XtRemoveGrab
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function removes widgets from the modal cascade starting
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at the most recent widget up to and including the specified widget.
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It issues an error if the specified widget is not on the modal cascade.
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.SH "SEE ALSO"
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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