178 lines
3.8 KiB
Plaintext
178 lines
3.8 KiB
Plaintext
.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 XtMake-Geometry-Request XtQuery-Geometry wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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.de De
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.ce 0
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.fi
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..
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.de FD
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.LP
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.KS
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.TA .5i 3i
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.de FN
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.KE
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.de IN \" send an index entry to the stderr
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.de C{
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.ne 7
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.ds NO Note
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.ny0
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.TH XtAddGrab 3Xt "Release 3" "X Version 11" "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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void XtAddGrab(\fIw\fP, \fIexclusive\fP, \fIspring_loaded\fP)
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.br
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Widget \fIw\fP;
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.br
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Boolean \fIexclusive\fP;
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.br
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Boolean \fIspring_loaded\fP;
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.LP
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void XtRemoveGrab(\fIw\fP)
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.br
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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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.ds Wi to add to or remove from the modal cascade
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.IP \fIw\fP 1i
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Specifies the widget \*(Wi.
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.SH DESCRIPTION
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The
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.ZN 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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.ZN True
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if spring_loaded is
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.ZN True .
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If these are not
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.ZN True ,
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.ZN 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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.ZN 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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.ZN 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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.ZN 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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.ZN 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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.ZN 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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.ZN True ,
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if any such widget exists.
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.LP
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The
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.ZN 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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