מדריך מפתחים של PDFiumPas

מחשב מספרי דף שמאלי וימני עבור מצבי תצוגה של שני דפים

Syntax

procedure ComputeSpreadPages(DisplayMode: TPdfDisplayMode; PageNumber, PageCount: Integer; out LeftPageNo, RightPageNo: Integer);

ComputeSpreadPages resolves the one-based left and right page numbers for TPdfView display modes without creating a viewer control

It handles dmTwoPageContinuousWithCover by keeping page 1 alone and then pairing later pages as spreads

RightPageNo is 0 when there is no right-side page for the current spread
PageNumber is clamped into the valid 1..PageCount range before the spread is calculated

ComputeSpreadPages(dmTwoPageContinuousWithCover, PageNumber, PageCount, LeftPage, RightPage);