Title: Mouse cursor hourglass/normal changer unit
Question: Howto change the mousecursor into a hourglass/normal.
Answer:
unit waitcursor;
{ WaitCursor - Copyright (c) 2001 by E.J.Molendijk
A mousecursor hourglass/normal changer tool. Supports layered requests.
WCursor.SetWait = mouse cursor as Hourglass
WCursor.SetWaitSQL = mouse cursor as SQL Hourglass
WCursor.SetNormal = mouse cursor as normal
example:
WCursor.setWait;
try
DoSometingVerySlow;
finally
WCursor.setNormal;
end;
}
interface
type
TWaitCursor = class
private
FCursor : integer;
FCnt : integer;
public
constructor Create;
destructor Destroy; override;
procedure SetCursor(Index: integer);
procedure SetWait;
procedure SetWaitSQL;
procedure SetNormal;
end;
var
WCursor : TWaitCursor;
implementation
uses Forms, Controls;
constructor TWaitCursor.Create;
begin
inherited;
// depth is zero
FCnt := 0;
// remember default cursor
FCursor := Screen.Cursor;
end;
destructor TWaitCursor.Destroy;
begin
// Reset to default cursor
Screen.Cursor := FCursor;
inherited;
end;
procedure TWaitCursor.SetCursor(Index: integer);
begin
// select cursor
Screen.Cursor := Index;
end;
procedure TWaitCursor.SetNormal;
begin
// decrease depth
if FCnt0 then Dec(FCnt);
// if we reach depth 0 we restore default cursor
if FCnt=0 then SetCursor(FCursor);
end;
procedure TWaitCursor.SetWait;
begin
// increase depth
Inc(FCnt);
// select wait cursor
SetCursor(crHourglass);
end;
procedure TWaitCursor.SetWaitSQL;
begin
// increase depth
Inc(FCnt);
// select wait cursor
SetCursor(crSQLWait);
end;
initialization
WCursor := TWaitCursor.Create;
finalization
WCursor.Free;
end.