Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== SD_SCROL/IOW_SCRA etc ====== These traps scroll all or part of a window. ^Trap^Value in D0.B^Action^ |SD_SCROL/IOW_SCRA|$18|Scroll all of window| |SD_SCRTP/IOW_SCRT|$19|Scroll top of window| |SD_SCRBT/IOW_SCRB|$1A|Scroll bottom of window| ^Call Parameters^^Return Parameters^^ |D0.B|See above|D0.L|Error return.| |D1.W|Distance to scroll |D1.L|Corrupted.| |D3.W|Timeout |D3.L|Preserved.| |A0.L|Channel ID |A0.L|Preserved.| ===== Errors ===== |ERR_NC|Not complete.| |ERR_NO|Channel not open.| ===== Notes ===== * All registers not shown above are not used on entry and are preserved on exit. * Scrolling means that the area selected will be moved up or down by an integral number of pixels. A positive number in D1.W will cause a downward movement. The vacated rows of pixels will be filled with paper colour. * The top of a window is defined as all the rows above the line on which the cursor lies (the cursor line). * The bottom of the window is defined as all the rows below the cursor line. ===== Example ===== The example below shows the use of this trap call to scroll text up by one line. It is assumed that A0 contains the correct channel ID. <code> scroll moveq #sd_scrol,d0 ; $18 moveq #-10,d1 ; Up one line moveq #-1,d3 ; Timeout trap #3 ; Scroll up a line tst.l d0 ; OK? . . bne error ; . . no! </code> qdosmsq/traps/trap_3/pana.txt Last modified: 2009/05/18 16:53by george.gwilt