Represents the Position and Size on Screen of an Form poDesigned - The Form appears exactly as it is positioned and sized in the Form Designer
poDefault - The window manager decides how the form is to appear, in a default position and size
poDefaultPosOnly - keeps the Designed size, but position determined by windowmanager
poDefaultSizeOnly - keeps the Designed position, but size determined by windowmanager
poScreenCenter - Centers the form on screen
poDeskTopCenter - Centers the form on desktop
poMainFormCenter - Centers the Form on the Main Form
poOwnerFormCenter - Centers the Form on Owner form Represents the actual State of the window on the screen wsNormal - The window appears normal
wsMinimized - The window appears minimized
wsMaximized - The window appears maximized TCustomForm.OnClose Scrolling Window Control Scrolling Window Control: A window control with scroll bars.
An ancestor class for many forms with scrolling windows Exception in Scroll Bar Exception class for Scroll Bar Control Scroll Bar Control Scroll Bar: Scroll Bar control for adding to windows. Can be horizontal or vertical.
This is an ancestor class for many form types and classes of windowed controls Create an instance of a Scroll Bar Control The identity of the windowed control in which the scroll bar is found Whether this is a horizontal or a vertical scrollbar Finds some properties of the control bar from the source control Assigns the contents of the source object to the current object; in particular finds the increment, position, range and whether smooth scrolling is to be feature and whether the scroll bar is visible The object that called this instance of the class Visibility of scroll bar Returns 'True' if scroll bar visible Position of the indicator cursor on the scroll bar Returns position of the scroll cursor as an integer Finds which kind of scroll bar this is: horizontal or vertical Reads a flag to determine which kind of scroll bar Finds out details of the other scroll bar Returns a link to the details of the other scroll bar Find out details about the horizontal scroll bar Returns details of the horizontal scroll bar as a pointer to a structure Find out details of the vertical scroll bar Returns details of the vertical scroll bar as a pointer to a structure Determine the size of the scroll bar Reads or writes a flag to determine the size; by default the size is not stored The size of the scrolling increment The amount by which the scroll indicator moves if the triangle at either end of the bar is selected.
Read or write a flag to determine the increment, an integer with a default value of 8 (pixels) The size of the paging increment for scrolling The amount by which the scroll indicator moves if the cursor selects the scroll bar above, below or on either side of the scroll indicator.
Reads or writes a flag to determine paging increment; default value is 80 pixels Determine whether smooth scrolling is to be implemented Reads or writes a flag to determine smooth scrolling, and sets a flag is the scrolling status is stored Position of the scroll bar Reads or writes a flag with the position; default is zero The range (extent) of the scroll bar Reads or writes a flag to determine the range; default is zero Is the scroll bar visible? Reads or writes flag to determine visibility, and sets a flag if the property is stored Create an instance of a scrolling window control This constructor can override the constructor of an ancestor class Destroy this instance of scrolling window control, and free its resources Can override destructor of parent class Update the position of the scroll indicatores in the scroll bars Checks if the scroll bars are in process of being loaded or destroyed;
if so, or if there is no valid handle, exit.
If the indicators are valid, re-computes position etc Does auto-scrolling apply? Reads or writes a flag to determine auto-scrolling Scroll Box Scroll Box: A box with scroll bars Custom Frame Custom Frame: The base type for Frame Frame Frame - a container for all the other components on a form, or for a group of components within a form Specifies which icon appears on the top border of the Form biSystemMenu - The form has a System menu (Maybe not all windowmanager supports this)
biMinimize - The form has an minimize button
biMaximize - The form has a maximize button
biHelp - When you click this button a Question Cursor appears and the help routines are called if you click on an control Custom Form Custom Form - the base type for FORM Shows, brings to front and activates the form Is true when the form has the focus Use active to check if the form has the focus Specifies the active control on the form Use this to get or set the active control on this form Specifies if it is allowed to drop files on this form. Set AllowDropFiles event to True to allow dropping files on this form. It is set to False by default. Specifies which icons appear on the top of the form Use bordericons flags to get or set the icons that appear on the top border of the form.
By default we see down-triangle or other generic icon on the left,
which activates a pop-up system menu allowing closure or re-sizing of the form,
and on the right end we see the minimise and re-size/maximise buttons,
but of course these can be customised by the application programmer. Specifies the appearance of the form's border Use borderstyle to get or set the appearance of the form's border.
By default it is a sizeable window, but it could, for example, be a dialog form or a tool window, or could be non-sizeable The control associated with the cancel action Reads or writes a flag to determine the control associated with the Cancel action (exit from the control without changing anything).
This is usually a button with the caption 'Cancel', but might be an 'Exit' button or anything else the application programmer decides..
This control is selected either by explicitly clicking with the mouse, or by hitting the 'Esc' key The colour of the form The form's colour; by default it is the same as the colour specified for button faces. The control associated with the default action for this form Reads or sets a flag determining the default control.
This is typically a button such as 'Accept' which is highlighted in some way on-screen to indicate that this is the default action, and is selected either by hitting 'Return' or 'Enter' or by selecting that control with the mouse Determines the state of the form Reads or writes a flag to determine the form's state:
is it being created, is this its first showing, is the border style being changed, etc.
FormState is a set, so could take zero or more of possible values. Determinates the style of the form Reads or writes flag to determine the style of the form.
Default is 'normal', but could be MDIChild or MDINormal,
could stay on top or could be a 'Splash' form.
FormStyle is a set, could take zero or more of these values. Specifies the help file that is used by the form Reads or writes a flag to determine identity of Help file,
and to determine whether its name is stored.
Property contains filename as a string. Specifies a MainMenu for this form Drop a TMainMenu on the form and select it here to show it on the form.
Specifies the return value of an modal form Reads or writes a flag to determine whether there is a modal resut.
If the form is modal, returns an integer value. The event invoked when file is dropped on this form. The OnDropFiles event is invoked when user drops one or multiple files on this form. You enable this feature by setting AllowDropFiles property. The scaling of the form in proportion to the screen resolution Reads or writes a flag to determine the scaling factor (a longinteger).
Not normally stored locally The position of the form on the screen Reads or writes a flag to determine screen position of form.
By default it is in the position that it was placed in the Form Designer Indicates if the form is visible Set or get this to set the form visible/hidden or get the status of the form Represents how the form appears on the screen Reads or write flag to determine state of the window on screen.
Default is 'normal' (ie not minimised or maximised) Form Form - the fundamental visual object that appears in every GUI application.
Most of the properties are inherited from the ancestors Specifies the control that has the focus on the form Use active control to set or get the control that has the focus on this form Hint Window Hint Window - the popup box containing helpful information that appears when the mouse pointer hovers over an object Screen Screen - the visible area Specifies which style the form border has Create an instance of TScreen Destroy this instance of TScreen The Index number of a Custom Form on the screen The Index number of the Custom Form, stored as an integer The Custom Form to which the Index refers The index number of a Form on the Screen The index number of the Form, stored as an integer The Form to which the Index refers Method for updating screen The identity of the active control on this screen Reads a flag to determine the active control The identity of the active Custom Form on this screen Reads a flag to determine the active Custom Form The identity of the active Form on this Screen Reads a flag to determine the active Form The cursor being used in this screen Reads or writes a flag to determine the cursor.
This can take any integer value, but there are several pre-determined cursor styles
listed as constants in 'Controls',
and these should be used to define the cursor for the current screen The number of Custom Forms on this screen Reads flag to determine number of Custom Forms (integer) The number of Forms on this screen Reads a flag to determine the number of Forms (integer) The list of Forms in this Screen Index number of a Form, stored as an integer The fonts to be used in this screen Reads a flag to determine the fonts to be used; their names are stored as a list of strings The height of the screen Reads a flag to determine screen height; stored as an integer The font to be used to display hints Reads a flag to determine the font to be used (font name stored as a string) The width of the screen Reads flag to determine screen width, stored as an integer Scaling factor for displaying graphic information on the screen Reads a flag to determine number of pixels per inch (integer) Application - the whole current program, described as an object Application - the whole current program, described as an object.

Includes useful function MessageBox, a simple dialog Create an instance of TApplication This instance of the constructor performs most of the setting up of the environment for the application. The instances of Create that occur in some of the ancestor classes are place holders rather than actual instructions for constructing the object The Owner object that invoked this instance of TApplication Destroy this instance of TApplication and free its resources Method for dealing with a control that has been destroyed Use the selected widget set's method to bring the application's form(s) to the front Create Form or any other kind of component Note: The name is confusing and only kept for Delphi compatibility.
It can actually create any kind of component

Creates a Component instance, sets the pointer to the component variable and loads the component.
If it is a form it will be added to the application's forms list Insert a given asynchronous call into the queue The method to be used for the asynchronous call The data structure used by the asynchronous call method The method to be used to execute the action associated with the Application This is a function that should be supplied by the application programmer, to override the placeholders declared in ancestor classes Exception handler - methods to be followed in response to exceptions Individual exception handler methods should be supplied by the application programmer, to override place-holder entries declared in ancestor classes.
This method checks whether the application is required to halt if an exception occurs, or invokes the appropriate handler.
It also writes details of the exception to the appropriate place for debugging. Process all events according to the method defined for the widget set Cancels a request for a hint, if there is no hint timer or no hint to display Don't display the hint the icon to be associated with this application Reads or writes a flag to determine the Icon Initialize any forms associated with the application Finds the appropriate widget set, reads the application's icon (if any) from the Lazarus Resource file, initialises the screen, and leaves it ready for processing. Message Box Message Box: a useful function to display a message.
The function is used internally to display messages during the handling of Exceptions , but is also available to application programmers as an alternative to some of the message dialogs found in Dialogs .
The function returns an integer value corresponding to the button that was pressed; its value can be determined by reference to the constants [IDOK..IDHELP]

It can be invoked like a procedure call (ie as a 'MessageBox()' statement rather than as a 'Variable := MessageBox()' function call) Result Result: integer value returned by the function to signify which box was selected

Can be one of the following values:

IDOK
IDCANCEL
IDABORT
IDRETRY
IDIGNORE
IDYES
IDNO
IDCLOSE
IDHELP Text Text: the string that is displayed as a prompt or instruction in the Box; Caption Caption: the string label at the top of the message box; Flags Flags: longint - an integer constructed by adding together various constants to define the contents and behaviour of the box, for example
MB_ABORTRETRYIGNORE + MR_ICONQUESTION will cause the application to display a query (?) icon in a box with three buttons:
ABORT RETRY IGNORE.

The following button constants are available:

MB_OK
MB_OKCANCEL
MB_ABORTRETRYIGNORE
MB_YESNOCANCEL
MB_YESNO
MB_RETRYCANCEL

And the following icon constants:

MB_ICONHAND
MB_ICONQUESTION
MB_ICONEXCLAMATION
MB_ICONASTERICK
MB_ICONWARNING = MB_ICONEXCLAMATION
MB_ICONERROR = MB_ICONHAND
MB_ICONSTOP = MB_ICONHAND
MB_ICONINFORMATION = MB_ICONASTERICK

These constants are declared on the LCLType unit. Minimise the form using the widget set's method the method to be used to make the application execute. This method should be supplied by the application programmer, and should be the main process control procedure for the application Show any exception that has occurred The exception that is to be displayed If exceptions have occurred, find out what they are, ready for processing The hint associated with the main application A hint is a small pop-up mesage that appears briefly while the mouse hovers over a specified area of the screen. It usually displays useful information about how to use an object or what data should be entered, etc

Reads or writes a flag to determine the hint associated with the application The colour used to display the hint The delay period after mouse entry before the hint becomes visible The length of time for which the hint is displayed Determine how the form is to be navigated Reads or writes a flag to determine the navigation method:
Is Tab used to move to next control?
Does Enter or Ret activate the default action?
Does Esc perform the cancel action?
Does F1 activate a Help system?

Navigation Options is a set, so can take zero or more of the available values The Main Form used by the application for process control and for data input/output Reads a flag to get particulars of the main form The event invoked when file is dropped on one of the application forms. The OnDropFiles event is invoked when user drops one or multiple files on one of the application forms. You must enable this feature by setting AllowDropFiles property of form. The Title to be displayed in the top border of the Main Window Reads or writes a flag to determine the Title string Application Properties Application Properties: The properties of the current application Create an instance of TApplication Properties Determine whether exceptions are being captured Boolean property (true if exceptions are being captured); reads or writes flag to see if they are being captured Determines which file to use for Help Reads or writes flag to determine name of Help file - name is stored as a string Determines Hint to be used Reads or writes flag to determine Hint - stored as a string Colour to be used when displaying Hint Reads or writes flag to determine Hint colour (stored as a TColor integer) Determines whether a hint is to be displayed Read or write flag to determine whether to display hint (stored as boolean, True if hint is to be displayed) Title to be shown in Application's top Border Data Module Data Module: for interfacing to the database