Winbeginpaint - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — Windows

WinBeginPaint

Declaration: void WinBeginPaint (WINDOW * w )
Category(ies): Windows
Description: Save the current screen state and sets up the screen to draw for the
current window. WinBeginPaint is always paired with WinEndPaint which
restores the screen state.
Inputs: w — WINDOW struct of a previously opened window.
Outputs: None
Assumptions: If an app has only one window then it can do a WinBeginPaint on its
CM_ACTIVATE message and a WinEndPaint on its CM_DEACTIVATE
message. If an app has multiple windows then routines that draw to
separate windows should have WinBeginPaint and WinEndPaint pairs
around them.
Side Effects: The screen is setup to draw for this window.
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: WinEndPaint
Example:
CM_ACTIVATE:
EV_defaultHandler(e);
WinBeginPaint( &appW );
WinActivate( &appW );
WinStr( &appW, "Just activated\n" );
break;
case CM_DEACTIVATE:
WinEndPaint( &appW );
break;
TI-89 / TI-92 Plus Developer Guide Not for Distribution
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Beta Version January 26, 2001