PagePaintHook
A PagePaintHook
hook procedure is an application-defined or library-defined callback procedure
that is used with the Page Setup dialog box. The hook procedure receives
messages that allow you to customize drawing of the sample page in the Page
Setup dialog box.
UINT APIENTRY PagePaintHook(
|
HWND hdlg, |
// handle to the
dialog box window |
|
UINT uiMsg, |
// message
identifier |
|
WPARAM wParam, |
// message
parameter |
|
LPARAM lParam |
// message
parameter |
|
); |
|
Parameters
hdlg
Handle to the
Page Setup dialog box window.
uiMsg
Identifies
the message being received.
wParam
Specifies
additional information about the message. The exact meaning depends on the
value of the uiMsg parameter.
lParam
Specifies
additional information about the message. The exact meaning depends on the
value of the uiMsg parameter.
Return Values
If the hook
procedure returns TRUE for any of the first three messages of a drawing
sequence (WM_PSD_PAGESETUPDLG, WM_PSD_FULLPAGERECT, or WM_PSD_MINMARGINRECT), the
dialog box sends no more messages and does not draw in the sample page until
the next time the system needs to redraw the sample page. If the hook procedure
returns FALSE for all three messages, the dialog box sends the remaining
messages of the drawing sequence.
If the hook
procedure returns TRUE for any of the remaining messages in a drawing sequence,
the dialog box does not draw the corresponding portion of the sample page. If
the hook procedure returns FALSE for any of these messages, the dialog box draws
that portion of the sample page.
Remarks
The Page
Setup dialog box includes an image of a sample page that shows how the user s
selections affect the appearance of the printed output. The image consists of a
rectangle that represents the selected paper or envelope type, with a
dotted-line rectangle representing the current margins, and partial (greek
text) characters to show how text looks on the printed page. When you use the PageSetupDlg function to create a Page
Setup dialog box, you can provide a PagePaintHook hook procedure to
customize the appearance of the sample page.
To enable the
hook procedure, use the PAGESETUPDLG structure that you passed to the dialog
creation function. Specify the pointer to the hook procedure in the lpfnPagePaintHook
member and specify the PSD_ENABLEPAGEPAINTHOOK flag in the Flags member.
Whenever the
dialog box is about to draw the contents of the sample page, the hook procedure
receives the following messages in the order in which they are listed:
|
Message |
Meaning |
|
WM_PSD_PAGESETUPDLG |
The dialog
box is about to draw the sample page. The hook procedure can use this message
to prepare to draw the contents of the sample page. |
|
WM_PSD_FULLPAGERECT |
The dialog
box is about to draw the sample page. This message specifies the bounding rectangle
of the sample page. |
|
WM_PSD_MINMARGINRECT |
The dialog
box is about to draw the sample page. This message specifies the margin
rectangle. |
|
WM_PSD_MARGINRECT |
The dialog
box is about to draw the margin rectangle. |
|
WM_PSD_GREEKTEXTRECT |
The dialog
box is about to draw the greek text inside the margin rectangle. |
|
WM_PSD_ENVSTAMPRECT |
The dialog
box is about to draw in the envelope-stamp rectangle of an envelope sample
page. This message is sent for envelopes only. |
|
WM_PSD_YAFULLPAGERECT |
The dialog
box is about to draw the return address portion of an envelope sample page.
This message is sent for envelopes and other paper sizes. |
PagePaintHook is a placeholder for the application-defined or
library-defined function name. The LPPAGEPAINTHOOK type is a pointer to
a PagePaintHook hook procedure.
See Also