Defines several specialist button classes A set of constants to define the position of a glyph on a button. A set of constants to define the state of a SpeedButton. A small image that can be attached to buttons Button Glyph: The graphics and legend on a button Creates a new instance of the TButtonGlyph class If you drop a component on the form editor you don´t need to add code to explicitly create it. The component is automatically created together with the the form, and destroyed when the form is destroyed. However, if you create the component by code don´t forget to free it when it is no longer needed. Constructors allocate memory and system resources needed by the object. They also call the constructor of any sub-objects present in the class. Deallocates an object If you call Destroy for an object which hasn´t being initialized yet it will generate an error. Always use the Free method to deallocate objects, because it verifies if object variable doesn´t contain the value nil. Take the following precautions when creating your own Destroy method: * Declare Destroy with the override directive, because it is a virtual method. * Always call 'inherited Destroy;' as the last thing on the destructor code. * An exception may be raised on the constructor in case there is not enought memory to create an object, or something else goes wrong. If the exception is not handled inside the constructor, the object will be only partially built. In this case Destroy will be called, so your destructor must check if the resources were really allocated before disposing of them. * Remember to call Free for all objects created on the constructor. Draw the image in the specified rectangle, within the client rectangle at specified offset, with the specified state and transparency The small bitmap image to be drawn on the button The number of glyphs to be drawn Event handler for a change in the glyph A set of possible types for BitButtons. The ancestor class for TBitBtn. TCustomBitBtn is the ancestor for TBitBtn. If you want to define your own bitbutton class, you should use this class to derive it from. Change the action associated with this BitButton Click - the procedure which allows programmatic simulation of a mouse click

Click - the procedure which allows programmatic simulation of a mouse click, and thus activation of the Action associated with the OnClick event

What to do if the Glyph has been changed Initialise the window Creates a new instance of the TCustomBitBtn class If you drop a component on the form editor you don´t need to add code to explicitly create it. The component is automatically created together with the the form, and destroyed when the form is destroyed. However, if you create the component by code don´t forget to free it when it is no longer needed. Constructors allocate memory and system resources needed by the object. They also call the constructor of any sub-objects present in the class. Deallocates an object If you call Destroy for an object which hasn´t being initialized yet it will generate an error. Always use the Free method to deallocate objects, because it verifies if object variable doesn´t contain the value nil. Take the following precautions when creating your own Destroy method: * Declare Destroy with the override directive, because it is a virtual method. * Always call 'inherited Destroy;' as the last thing on the destructor code. * An exception may be raised on the constructor in case there is not enought memory to create an object, or something else goes wrong. If the exception is not handled inside the constructor, the object will be only partially built. In this case Destroy will be called, so your destructor must check if the resources were really allocated before disposing of them. * Remember to call Free for all objects created on the constructor. The BitMap Glyph to be displayed on the button The number of glyphs for display What kind of BitButton? Custom, OK, Cancel, Yes, No etc Layout of button - Glyph at top, bottom, left or right The margin to be left around glyphs The spacing around the BitButton A Button with a small image attached Bit Button: a push button control on a toolbar causing a particular action to be executed. It often displays a glyph or small graphic to denote its function. HowToUseStdCtrls The action to be associated with this control

// standard properties, which should be supported by all descendants

The (default) action to be associated with this control

Can either read the action already associated with the control (GetAction), or write an action to be associated (SetAction)

 Used to align the control in one of four directions.

// standard properties, which should be supported by all descendants

Either reads a flag containing alignment instructions (FAlign) or writes alignment instructions (SetAlign)

May have no alignment, may have custom or client alignment, or can be aligned to top, bottom, left or right

 The set of anchor definitions for this control

// standard properties, which should be supported by all descendants

Determines how the control is to be anchored to its client or parent conrol

Either reads a flag containing the set of anchors to be used, or writes a set of anchors. If they have been written, this is indicated in IsAnchorsStored

Determines the border spacing for this control

// standard properties, which should be supported by all descendants

Determines the border spacing for this control

Reads flag to find stored spacing values required for the border of the control, or writes the flag to set the spacing.

The properties are defined in the parent class TControlBorderSpacing

Is this the Cancel button? (default setting is False)

Setting this property to true, will have the effect that when the user hits ESC this button is Clicked, even if the button does not have focus. Usually the Button which reacts to ESC sets the ModalResult of the form to mrCancel.

 Caption - the text-string appearing on the Control, usually used to identify its function

Gets caption as a text-string (GetText), or stores the new caption (SetText). Shows flag if caption is stored (IsCaptionStored).

By default, the Caption appears the same as the control Name in the Object Inspector, and the developer needs to set it explicitly to some new text.

The VCL implementation relies on the virtual Get/SetTextBuf to exchange text between widgets and VCL. This means a lot of (unnecesary) text copies.

The LCL uses strings for exchanging text (more efficient). To maintain VCL compatibility, the virtual RealGet/SetText is introduced. These functions interface with the LCLInterface.

The default Get/SetTextBuf implementation calls the RealGet/SetText. As long as the Get/SetTextBuf isn't overridden Get/SetText calls RealGet/SetText to avoid PChar copying.

To keep things optimal, LCL implementations should always override RealGet/SetText. Get/SetTextBuf is only kept for compatibility.

 Determine Constraints (max and min height and width) for this control

// standard properties, which should be supported by all descendants

Determine Constraints (max and min height and width) for this control; reads the size constraints or stores new ones.

 Is this the Default button? (default setting is False)

Defines if a button is the Default on a form. That is, pressing ENTER will execute its onClick method, whether the control has focus or not!

 Whether the control is Enabled. If not, it usually appears 'greyed-out'

// standard properties, which should be supported by all descendants

Whether the control is Enabled. If not, it usually appears 'greyed-out'

Reads a flag to see whether the control is enabled, or stores a new value. If stored, sets a flag to say so.

 The Font to be used for text in this control

// standard properties, which should be supported by all descendants

Reads a flag to see what font should be used, or sets a flag to store it. If stored, sets a flag to say so

The properties of Font are defined in the parent class TFont

The BitMap Glyph to be displayed on the button What kind of BitButton? Custom, OK, Cancel, Yes, No etc Layout of button - Glyph at top, bottom, left or right The margin to be left around glyphs Is a Modal Result awaited? (default is false) Event handler for a change in bounds of the control

// standard properties, which should be supported by all descendants

Reads or Writes flag if bounds are changed

 Event Handler for mouse click

// standard properties, which should be supported by all descendants

This is often the default action for many controls, and is often the ONLY action specified by the programmer. The action can be spcified by the user, either by typing explicit code into the implementation section for this control, or by selecting an action from a pre-supplied ActionList

Reads or writes a flag if a mouse click is detected, and sets a flag if a value is stored.

 OnEnter - event handler for when the mouse enters the control, and the control receives focus OnExit - event handler for when the mouse leaves the control and it loses focus OnKeyDown - event handler for instance when key is down while control has focus

OnKeyDown - event handler for instance when key is down while control has focus

Differs from OnKeyPress in that the key may have already been down when the control received focus; with OnKeyPress the key needs to become pressed while the control has focus.

 OnKeyPress - event controller for a key being pressed while the control has focus

OnKeyPress - event controller for a key being pressed while the control has focus

Differs from OnKeyDown in that the key needs to become pressed while the control has focus; with OnKeyDown the key may have already been down when the control received focus.

 OnKeyUp - event handler for instance when a key is up (not pressed) while the control has focus

OnKeyUp - event handler for instance when a key is up (not pressed) while the control has focus

The key may already have been up when the control received focus, or a pressed key may become released during the time the control has focus.

 Event handler for when a mouse button is pressed down Event handler for mouse movement within the current control Event Handler for resize of control // standard properties, which should be supported by all descendants
Reads or Writes flag if control is re-sized. ParentShowHint - does the control adopt the same hinting behaviour as its parent? Default is true PopupMenu - a context-sensitive menu that pops up when the right mouse button is clicked over this control // standard properties, which should be supported by all descendants
Reads the details of the pop-up menu, or stores them.
Properties are defined in the parent class TPopupMenu Flag to determine: Is hint to be displayed for this control? // standard properties, which should be supported by all descendants
Reads flag or writes one to determine if a hint is to be shown when mouse hovers over this control. If value is stored, a storage flag is set. Display of the actual hint is controlled by OnShowHint The spacing around the BitButton The place this control occupies in the list of tabs Reads or writes information in flag; default is -1 Is the Button included in the TabStop list? (default setting is True) Visible - can the control be seen? 
The Visible property represents the ability to see a visual control. 
          If Visible is True the control is shown, otherwise it is hidden.
          Calling Show sets, among others, Visible to True.
          Setting Visible to False is equivalent to calling Hide method.
The Visible property does not depend on control's parent visibility. Use IsVisible method to consider this and get real visibility. Links a TSpeedButton with an action. The ancestor class for TSpeedButton

TCustomSpeedButton is the ancestor for TSpeedButton. If you want to define your own speedbutton class, you should use this class to derive it from.

The Speed Button is designed to automate a process when it is selected. An user pushes a button to start an action or set a mode.

When a user clicks on a SpeedButton focus is not shifted; a Speed Button never gets focus. The button may carry an descriptive glyph, and has a state (checked or not, etc)

 The state of the speedbutton (whether checked or not) Find the number of Glyphs What to do if the Glyph has changed Paint the Glyph Procedure to store text associated with the control in a string This is the procedure that is actually used by SetTextBuf, and stores text as a string rather than performing read-write to a PChar buffer Called when the component has finished loading.

Loaded is called by the streaming system when a root component was completely read from a stream and all properties and references to other objects have been resolved by the streaming system. Descendents of TComponent should override this method to do some additional processing of properties after all published properties have been set from values obtained from the stream.

Application programmers should never call Loaded directly, this is done automatically by the streaming system.

Creates a new instance of the TCustomSpeedButton class If you drop a component on the form editor you don´t need to add code to explicitly create it. The component is automatically created together with the the form, and destroyed when the form is destroyed. However, if you create the component by code don´t forget to free it when it is no longer needed. Constructors allocate memory and system resources needed by the object. They also call the constructor of any sub-objects present in the class. Destroy this instance of a graphic control and return its resources Click - a procedure that allows the programmer to simulate a mouse click over the control, and initiates the same Action as that associated with the OnClick event Boolean flag to determine whether all buttons are allowed to be Up (default false) The button has been set in the Down state The Bitmap glyph to be used on this button The Index within the group of speedbuttons The button layout - Glyph at top, bottom, left or right Margin - the space around glyphs The number of Glyphs available Spacing around button Whether button is transparent A Button used to represent states (checked or not, etc) The Speed Button is designed to automate a process when it is selected. An user pushes a button to start an action or set a mode.
When a user clicks on a SpeedButton focus is not shifted; a Speed Button never gets focus. The button may carry an descriptive glyph, and has a state (checked or not, etc) HowToUseStdCtrls The action to be associated with this control

// standard properties, which should be supported by all descendants

The (default) action to be associated with this control

Can either read the action already associated with the control (GetAction), or write an action to be associated (SetAction)

 Used to align the control in one of four directions.

// standard properties, which should be supported by all descendants

Either reads a flag containing alignment instructions (FAlign) or writes alignment instructions (SetAlign)

May have no alignment, may have custom or client alignment, or can be aligned to top, bottom, left or right

 The set of anchor definitions for this control

// standard properties, which should be supported by all descendants

Determines how the control is to be anchored to its client or parent conrol

Either reads a flag containing the set of anchors to be used, or writes a set of anchors. If they have been written, this is indicated in IsAnchorsStored

Boolean flag to determine whether all buttons are allowed to be Up (default false) Determines the border spacing for this control

// standard properties, which should be supported by all descendants

Determines the border spacing for this control

Reads flag to find stored spacing values required for the border of the control, or writes the flag to set the spacing.

The properties are defined in the parent class TControlBorderSpacing

Determine Constraints (max and min height and width) for this control

// standard properties, which should be supported by all descendants

Determine Constraints (max and min height and width) for this control; reads the size constraints or stores new ones.

 Caption - the text-string appearing on the Control, usually used to identify its function

Gets caption as a text-string (GetText), or stores the new caption (SetText). Shows flag if caption is stored (IsCaptionStored).

By default, the Caption appears the same as the control Name in the Object Inspector, and the developer needs to set it explicitly to some new text.

The VCL implementation relies on the virtual Get/SetTextBuf to exchange text between widgets and VCL. This means a lot of (unnecesary) text copies.

The LCL uses strings for exchanging text (more efficient). To maintain VCL compatibility, the virtual RealGet/SetText is introduced. These functions interface with the LCLInterface.

The default Get/SetTextBuf implementation calls the RealGet/SetText. As long as the Get/SetTextBuf isn't overridden Get/SetText calls RealGet/SetText to avoid PChar copying.

To keep things optimal, LCL implementations should always override RealGet/SetText. Get/SetTextBuf is only kept for compatibility.

 The button has been set in the Down state Whether the control is Enabled. If not, it usually appears 'greyed-out'

// standard properties, which should be supported by all descendants

Whether the control is Enabled. If not, it usually appears 'greyed-out'

Reads a flag to see whether the control is enabled, or stores a new value. If stored, sets a flag to say so.

 The Bitmap glyph to be used on this button The Index within the group of speedbuttons The button layout - Glyph at top, bottom, left or right Margin - the space around glyphs The number of Glyphs available Spacing around button Whether button is transparent Visible - can the control be seen? 
The Visible property represents the ability to see a visual control. 
          If Visible is True the control is shown, otherwise it is hidden.
          Calling Show sets, among others, Visible to True.
          Setting Visible to False is equivalent to calling Hide method.
The Visible property does not depend on control's parent visibility. Use IsVisible method to consider this and get real visibility. Event Handler for mouse click

// standard properties, which should be supported by all descendants

This is often the default action for many controls, and is often the ONLY action specified by the programmer. The action can be spcified by the user, either by typing explicit code into the implementation section for this control, or by selecting an action from a pre-supplied ActionList

Reads or writes a flag if a mouse click is detected, and sets a flag if a value is stored.

 Event Handle for mouse double-click

Double-clicking is much more common in a Windows environment than in Unix or Linux, where single-clicking is the default method for selecting an object. However, in all environments there could be valid use for a double-click, and a method should be supplied if appropriate.

 Event handler for when a mouse button is pressed down Event handler for mouse movement within the current control Event handler for when the mouse button is released, ie "up" OnPaint - event handler for request to paint canvas Event Handler for resize of control // standard properties, which should be supported by all descendants
Reads or Writes flag if control is re-sized. Event handler for a change in bounds of the control

// standard properties, which should be supported by all descendants

Reads or Writes flag if bounds are changed

 Flag to determine: Is hint to be displayed for this control? // standard properties, which should be supported by all descendants
Reads flag or writes one to determine if a hint is to be shown when mouse hovers over this control. If value is stored, a storage flag is set. Display of the actual hint is controlled by OnShowHint ParentFont - should the control use the same font as the parent? Default is true ParentShowHint - does the control adopt the same hinting behaviour as its parent? Default is true PopupMenu - a context-sensitive menu that pops up when the right mouse button is clicked over this control // standard properties, which should be supported by all descendants
Reads the details of the pop-up menu, or stores them.
Properties are defined in the parent class TPopupMenu Find the index for the image and the effect to be used for drawing it The list of available images from which selection can be made The width of the glyph image The height of the glyph image What to do if the text of the Bitbutton has ben changed Find the default size for this class of controls (by reference to parents) What Colour is the button? (default is the same as all other button faces) The number of glyphs for display Paint the background Draw the glyph in the specified canvas in the specified rectangle at a given offset within the client, with specified state and transparency Find any Down button Should accelerator character be shown (ie underlined character denoting key to be pressed for quick action) Should caption be displayed? Determine the colour for the current control

// standard properties, which should be supported by all descendants

Reads the value for colour, or stores the value, and sets a flag if the colour is stored.

The default colour is the same as the window in which the control is located.

 The Font to be used for text in this control

// standard properties, which should be supported by all descendants

Reads a flag to see what font should be used, or sets a flag to store it. If stored, sets a flag to say so

The properties of Font are defined in the parent class TFont

Event handler for when the mouse enters the area of the current control Event handler for when the mouse leaves the area of the current control Should caption be displayed?