Commands > Select Pages

WPViewPDF allows to to select pages by mouseclick or through code.

The interactive selection is enabled by COMPDF_SelectMode.

To select pages by code and to work with selections this commands can be used:

COMPDF_PageSelectionCount = 246

Returns the count of selected pages.

COMPDF_PageSelectionGet = 247

Checks if a page is selected. Pass zero based page number. Result = 1, if selected.

COMPDF_PageSelectionClear = 248

Removes previous selection

COMPDF_PageSelectionAdd = 249

Select one additional page. Pass zero based page number. Result = count of selected pages. (Passs -1 to return Count)

COMPDF_PageSelectionDel = 250

Removes Selection from Page. Pass zero based page number.

Result = count of selected pages.

COMPDF_PageSelectionToggle= 258

Toggles state for a certain page. Pass zero based page number. Result = count of selected pages.

COMPDF_PageSelectionInvert= 251

Inverts Selection. Result = count of selected pages.

COMPDF_PageSelectionSaveRestore = 259

Saves the selection markers to a buffer and clears the selection.

With Param=1 it restores the buffer.

COMPDF_SYNC_CURRENT_AS_SELECTED = 1302

Synchronizes the current and the selected page. The current page should always also be selected and updated while scrolling the document.

COMPDF_BEGIN_SELECTION = 1300

COMPDF_END_SELECTION = 1301

COMPDF_BEGIN_SELECTION locks the SelectionChange event and the screen update until COMPDF_END_SELECTION is called.

The event OnViewerMessage (equal to window message WM_PDF_EVENT) is called when the selection is changed. The id of the selection change messe is MSGPDF_CHANGESELPAGE=108

Also note the ViewOption: wpHidePageSelection