TSettingChangeEvent is the type of an OnSettingChange event handler.
TSettingChangeEvent = procedure (Sender: TObject; Flag: Integer; const Section: string; var Result: Longint) of object;
(Sender: TObject; Flag: Integer; const Section: string; var Result: Longint) ( TSettingChangeEvent)();
Forms
TSettingChangeEvent has the following parameters:
Sender is the application object.
Section indicates the area that contains the system parameter that changed. Typically, this is a registry key or the name of a section in Win.ini. If the notification indicates a policy change, Section is the string 'Policy'. If the notification indicates a change in locale settings, Section is the string 'intl'.
Result is the value returned to Windows. It should be 0 if the event handler responded to the setting change, nonzero otherwise.
Flag indicates what setting changed. The following table lists the possible values:
|
Value |
Meaning |
|
0 |
A user policy was applied or a user locale setting changed. |
|
1 |
A computer policy was applied. |
|
SPI_SETDESKWALLPAPER |
The bitmap for the desktop wallpaper changed. |
|
SPI_SETCURSORS |
The system cursors changed. |
|
SPI_SETDESKPATTERN |
The desktop pattern was reloaded from Win.ini. |
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SPI_SETFONTSMOOTING |
The font smoothing feature was enabled or disabled. |
|
SPI_SETWORKAREA |
The size of the work area (the portion of the screen not obscured by the system taskbar or desktop toolbars) changed. |
|
SPI_ICONHORIZONTALSPACING |
The width, in pixels, of an icon cell changed. This affects the arrangement of icons in large icon view. |
|
SPI_ICONVERTICALSPACING |
The height, in pixels, of an icon cell changed. This affects the arrangement of icons in large icon view. |
|
SPI_SETICONMETRICS |
The metrics associated with system icons changed. |
|
SPI_SETICONS |
The system icons were reloaded. |
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SPI_SETICONTITLELOGFONT |
The font for icon titles changed. |
|
SPI_SETICONTITLEWRAP |
Icon title-wrapping was turned on or off. |
|
SPI_SETBEEP |
The warning beeper was turned on or off. |
|
SPI_SETDEFAULTINPUTLANG |
The default input language for the system shell changed |
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SPI_SETDOUBLECLICKTIME |
The double-click time for the mouse changed. |
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SPI_SETDOUBLECLICKHEIGHT |
The height of the double-click rectangle changed. |
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SPI_SETDOUBLECLICKWIDTH |
The width of the double-click rectangle changed. |
|
SPI_SETKEYBOARDCUES |
The setting for whether Menu access key letters appear always or only when the menu is activated from the keyboard changed. |
|
SPI_SETKEYBOARDDELAY |
The keyboard repeat-delay setting changed. |
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SPI_SETKEYBOARDPREF |
The keyboard preference changed. This indicates whether the user wants applications to display hidden keyboard interfaces. |
|
SPI_SETKEYBOARDSPEED |
The keyboard repeat-speed setting changed. |
|
SPI_SETLANGTOGGLE |
The hotkey for switching input languages changed. |
|
SPI_SETMOUSE |
The mouse threshold values or acceleration changed. |
|
SPI_SETMOUSEBUTTONSWRAP |
The meaning of left and right mouse buttons changed. |
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SPI_SETMOUSEHOVERHEIGHT |
The height of the rectangle in which the mouse must stay for mouse hover messages changed. |
|
SPI_SETMOUSEHOVERTIME |
The time the mouse must stay in the hover rectangle to generate mouse hover messages changed. |
|
SPI_SETMOUSEHOVERWIDTH |
The width of the rectangle in which the mouse must stay for mouse hover messages changed. |
|
SPI_SETMOUSESPEED |
The mouse speed changed. |
|
SPI_SETMOUSETRAILS |
Mouse trails were turned on or off. |
|
SPI_SETSNAPTODEFBUTTON |
The automatic snapping of the mouse to the default button was turned on or off. |
|
SPI_SETWHEELSCROLLLINES |
The number of lines to scroll when the mouse wheel rotates changed. |
|
SPI_SETMENUDROPALIGNMENT |
Popup menus changed between left- and right-alignment. |
|
SPI_SETMENUFADE |
Menu fade animation was turned on or off (Windows 2K) |
|
SPI_SETMENUSHOWDELAY |
The delay before displaying a shortcut menu when the mouse is over a submenu item changed. |
|
SPI_SETLOWPOWERACTIVE |
The low-power phase of screen saving was activated or deactivated. |
|
SPI_SETLOWPOWERTIMEOUT |
The time period before the low-power phase of screen saving is activated changed. |
|
SPI_SETPOWEROFFACTIVE |
The power-off phase of screen saving came on or off. |
|
SPI_SETPOWEROFFTIMEOUT |
The delay before activating the power-off phase of screen saving changed. |
|
SPI_SETSCREENSAVEACTIVE |
The screen saver was activated or deactivated. |
|
SPI_SETSCREENSAVETIMEOUT |
The delay before the screen saver appears changed. |
|
SPI_SETCOMBOBOXANIMATION |
The slide-open effect for combo boxes was turned on or off. |
|
SPI_SETCURSORSHADOW |
The cursor shadow was turned on or off (Windows 2K). |
|
SPI_SETGRADIENTCAPTIONS |
The gradient effect on window title bars was turned on or off. |
|
SPI_SETHOTTRACKING |
Hot-tracking was enabled or disabled. |
|
SPI_SETLISTBOXSMOOTHSCROLLING |
Smooth scrolling of list boxes was enabled or disabled. |
|
SPI_SETMENUANIMATION |
Menu animation was enabled or disabled. |
|
SPI_SETMENUUNDERLINES |
Same as SPI_SETKEYBOARDCUES. |
|
SPI_SETSELECTIONFADE |
The menu selection fade feature was enabled or disabled. (Windows 2K) |
|
SPI_SETTOOLTIPANIMATION |
ToolTip animation was enabled or disabled. (Windows 2K) |
|
SPI_SETTOOLTIPFADE |
ToolTip animation changed between a fade and a slide effect. (Windows 2K) |
|
SPI_SETUIEFFECTS |
UI effects were enabled or disabled. (Windows 2K) |
|
SPI_SETACTIVEWINDOWTRACKING |
Active window tracking (where the active window follows the mouse) was enabled or disabled. |
|
SPI_SETACTIVEWNDTRKZORDER |
Active window tracking changed whether the active window was brought to the top. |
|
SPI_SETANIMATION |
Parameters to the animation effects for user actions changed. |
|
SPI_SETBORDER |
The width of a window's sizing border changed. |
|
SPI_SETCARETWIDTH |
The width of the caret in edit controls changed (Windows 2K) |
|
SPI_SETDRAGFULLWINDOWS |
Dragging of full windows was turned on or off. |
|
SPI_SETDRAGHEIGHT |
The height of the rectangle used to detect drag operations changed. |
|
SPI_SETDRAGWIDTH |
The width of the rectangle used to detect drag operations changed. |
|
SPI_SETFOREGROUNDFLASHCOUNT |
The number of times a taskbar button flashes when rejecting a foreground switch request changed. |
|
SPI_SETFOREGROUNDLOCKTIMEOUT |
The time after user input during which applications can't force themselves into the foreground changed. |
|
SPI_SETMINIMIZEDMETRICS |
The metrics for minimized windows changed. |
|
SPI_SETNONCLIENTMETRICS |
The metrics for the nonclient area of nonminimized windows changed. |
|
SPI_SETSHOWIMEUI |
The ability of the IME window to be visible on a per-user basis changed. |
|
SPI_SETPENWINDOWS |
Pen windows was loaded or unloaded. (Windows 9x) |
|
SPI_SETACCESSTIMEOUT |
The time-out period for accessibility features changed. |
|
SPI_SETFILTERKEYS |
The parameters to the FilterKeys accessibility feature changed. |
|
SPI_SETHIGHCONTRAST |
The parameters to the HighContrast accessibility feature changed. |
|
SPI_SETMOUSECLICKLOCK |
The mouse ClickLock state was turned on or off. (Windows Me) |
|
SPI_SETMOUSECLICKLOCKTIME |
The time delay for locking the primary mouse button changed. (Windows Me) |
|
SPI_SETMOUSEKEYS |
The parameters for the MouseKeys accessibility feature changed. |
|
SPI_SETMOUSESONAR |
The mouse Sonar feature was turned on or off. (Windows Me) |
|
SPI_SETMOUSEVANISH |
The mouse Vanish feature was turned on or off. (Windows Me) |
|
SPI_SETSCREENREADER |
A screen reviewer utility (such as a speech synthesizer or Braille display utility) started or stopped running. |
|
SPI_SETSERIALKEYS |
The parameters to the SerialKeys accessibility feature changed. (Windows 9x) |
|
SPI_SETSHOWSOUNDS |
The Show Sounds accessibility feature toggled. |
|
SPI_SETSOUNDSENTRY |
The parameters to the SoundSentry accessibility feature changed. |
|
SPI_SETSTICKYKEYS |
The parameters to the StickyKeys feature changed. |
|
SPI_SETTOGGLEKEYS |
The parameters to the ToggleKeys feature changed. |
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