149 lines
2.8 KiB
C++
149 lines
2.8 KiB
C++
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/*++
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Copyright (c) 1995 Microsoft Corporation
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All rights reserved.
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Module Name:
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Select.cxx
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Abstract:
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Handles queuing and processing of commands.
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This module should _not_ be aware of any interfaces beyond
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TPrinter and MPrinterClient (i.e., no listview code).
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Author:
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Albert Ting (AlbertT) 07-13-1995
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Steve Kiraly (SteveKi) 10-23-1995 Additional comments.
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Revision History:
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--*/
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#include "precomp.hxx"
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#pragma hdrstop
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/********************************************************************
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Retrieve state of selected items.
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********************************************************************/
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TSelection::
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TSelection(
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IN const MPrinterClient* pPrinterClient,
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IN const TPrinter* pPrinter
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) : _pid( NULL ), _cSelected( 0 )
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/*++
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Routine Description:
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Get the JobIds of all selected jobs and the one that currently
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has focus. This is used when a refresh occurs and we need
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to update the queue while keeping selected items selected.
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Note: this routine is very slow, so we may want to optimize
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it if it uses too much cpu bandwidth. It should only be called on a
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full refresh (every 10 seconds on downlevel, rare on uplevel).
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This routine is very inefficient with TDataNotify, and not
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as bad with TDataRefresh.
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Must be called from UI thread.
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Arguments:
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pPrinterClient - Client from which we will grab selections.
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pPrinter - Printer.
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Return Value:
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--*/
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{
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UNREFERENCED_PARAMETER( pPrinter );
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SINGLETHREAD( UIThread );
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//
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// Quit if no printer client.
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//
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if( !pPrinterClient ){
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return;
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}
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//
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// Quit if no selections.
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//
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_cSelected = pPrinterClient->cSelected();
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if( !_cSelected ){
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return;
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}
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//
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// Allocate the variable length Job Id array within the
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// selection class. This optimizes the number of memory allocations.
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// Note the non-use of the new operator. This really is not a good
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// thing, it is the price we pay for greater efficiency.
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//
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_pid = (PIDENT) AllocMem( sizeof( IDENT ) * _cSelected );
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if( !_pid ){
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return;
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}
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if( pPrinterClient ){
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//
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// Put selected jobs in array.
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//
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HITEM hItem = pPrinterClient->GetFirstSelItem();
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COUNT i = 0;
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//
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// Strange looking FOR loop to prevent GetNextSelItem being
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// called any extra times.
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//
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for( ; ; ){
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_pid[i] = pPrinterClient->GetId( hItem );
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++i;
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if( i == _cSelected ){
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break;
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}
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hItem = pPrinterClient->GetNextSelItem( hItem );
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}
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}
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}
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TSelection::
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~TSelection(
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VOID
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)
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/*++
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Routine Description:
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Free the object.
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Callable from any thread.
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Arguments:
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Return Value:
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--*/
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{
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FreeMem( _pid );
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}
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