Merlin's Delphi Forge

Animated cursors have become very popular in the days of Windows 3.x. Now they have become a part of Windows 95 and newer. Sometimes you might want to use your own animated cursors instead of the user’s. The idea is same as with “normal” cursors.

Here’s the code:

const
  btCursorID1 = 1;
begin
  (* sCursorFile - (string) The full path of the animated cursor you want
  ** to use.
  *)
  Screen.Cursors[btCursorID1] := LoadCursorFromFile(sCursorFile);
  { This will set the cursor for the form }
  Cursor := btCursorID1;
end;

WinAMP has this very useful feature. If you drag it to the edge of the screen it will automatically position itself. Sometimes you want to make room on the screen but you don’t want to minimize your program and again you want to see it in full. The only way is the put it in a corner and set it exactly to the screen border. Well, this can be quite a challenge
But there’s no need to panic. All we have to do is intercept when the window is being moved and adjust it as needed.
This code adjusts the window within 30 pixels.

type
  Form1 = class(TForm)
    ...
    procedure WMExitSizeMove(var Message: TMessage); message WM_EXITSIZEMOVE;
...
procedure TForm1.WMExitSizeMove(var Message: TMessage);
var
  Pabd         : APPBARDATA;
  iScreenWidth,
  iScreenHeight: Integer;
  ScreenRect,
  TaskBarRect  : TRect;
begin
  if Message.Msg = WM_EXITSIZEMOVE then begin
    Pabd.cbSize := SizeOf(APPBARDATA);
    SHAppBarMessage(ABM_GETTASKBARPOS, Pabd);

    iScreenWidth := GetSystemMetrics(SM_CXSCREEN);
    iScreenHeight := GetSystemMetrics(SM_CYSCREEN);
    ScreenRect := Rect(0, 0, iScreenWidth, iScreenHeight);
    TaskBarRect := Pabd.rc;

    if (TaskBarRect.Left = -2) and (TaskBarRect.Bottom = iScreenHeight + 2) and (TaskBarRect.Right = iScreenWidth + 2) then
      ScreenRect.Bottom := TaskBarRect.Top
    else if (TaskBarRect.Top = -2) and (TaskBarRect.Left = -2) and (TaskBarRect.Right = iScreenWidth + 2) then
      ScreenRect.Top := TaskBarRect.Bottom
    else if (TaskBarRect.Left = -2) and (TaskBarRect.Top = -2) and (TaskBarRect.Bottom = iScreenHeight + 2) then
      ScreenRect.Left := TaskBarRect.Right
    else if (TaskBarRect.Right = iScreenWidth + 2) and (TaskBarRect.Top = -2) and (TaskBarRect.Bottom = iScreenHeight + 2) then
      ScreenRect.Right := TaskBarRect.Left;

    if Left > ScreenRect.Left + 30 then
      Left := ScreenRect.Left;
    if Top > ScreenRect.Top + 30 then
      Top := ScreenRect.Top;
    if Left + Width < ScreenRect.Right - 30 then
      Left := ScreenRect.Right - Width;
    if Top + Height < ScreenRect.Bottom - 30 then
      Top := ScreenRect.Bottom - Height;
  end;
  Message.Result := 1;
end;