Mega Code Archive
Filling the Screen with Your Form
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Title: Filling the Screen with Your Form
Question: I'd like to resize a form and have it fill up the screen. But I don't want it to display over the Win95/WinNT taskbar. Is there a way to do this?
Answer:
You bet there is. The following code comes to us via Peter Jagielski, a former Borland engineer, and myself. Peter is responsible for the SetSize procedure, which does most of the work. I put the code in a component wrapper so all you have to do is drop the component onto any form, call the component's execute procedure in FormCreate, and voila! an instantly sized form that fits nicely within your screen, above the Taskbar.
For Non-Windows 95 users, your form will be sized to maximized, but will be still be FormStyle := wsNormal. Select the text below, put it in a file, save the file as SizeTask.pas, add into your component library, drop it into a form, and watch it go!
unit Sizetask;
interface
uses
SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
Forms, Dialogs;
type
TSizer = class(TComponent)
private
{ Private declarations }
protected
{ Protected declarations }
procedure SetSize(MyForm: TForm);
public
{ Public declarations }
procedure Execute;
end;
procedure Register;
implementation
procedure TSizer.Execute;
begin
SetSize(TForm(Owner));
end;
procedure TSizer.SetSize(MyForm: TForm);
var
TaskBarHandle: HWnd; { Handle to the Win95 Taskbar }
TaskBarCoord: TRect; { Coordinates of the Win95 Taskbar }
CxScreen, { Width of screen in pixels }
CyScreen, { Height of screen in pixels }
CxFullScreen, { Width of client area in pixels }
CyFullScreen, { Height of client area in pixels }
CyCaption: Integer; { Height of a window's title bar in pixels }
begin
TaskBarHandle := FindWindow('Shell_TrayWnd',Nil); { Get Win95 Taskbar handle }
if TaskBarHandle = 0 then { We're running Win 3.x or WinNT w/o Win95
shell, so just maximize }
MyForm.WindowState := wsMaximized
else { We're running Win95 or WinNT w/Win95 shell }
begin
MyForm.WindowState := wsNormal;
GetWindowRect(TaskBarHandle,TaskBarCoord); { Get coordinates of Win95 Taskbar }
CxScreen := GetSystemMetrics(SM_CXSCREEN); { Get various screen dimensions and set form's width/height }
CyScreen := GetSystemMetrics(SM_CYSCREEN);
CxFullScreen := GetSystemMetrics(SM_CXFULLSCREEN);
CyFullScreen := GetSystemMetrics(SM_CYFULLSCREEN);
CyCaption := GetSystemMetrics(SM_CYCAPTION);
MyForm.Width := CxScreen - (CxScreen - CxFullScreen) + 1;
MyForm.Height := CyScreen - (CyScreen - CyFullScreen) + CyCaption + 1;
MyForm.Top := 0;
MyForm.Left := 0;
if (TaskBarCoord.Top = -2) and (TaskBarCoord.Left = -2) then {Taskbar on either top or left }
if TaskBarCoord.Right TaskBarCoord.Bottom then { Taskbar on top }
MyForm.Top := TaskBarCoord.Bottom
else { Taskbar on left }
MyForm.Left := TaskBarCoord.Right;
end;
end;
procedure Register;
begin
RegisterComponents('Samples', [TSizer]);
end;
end.
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