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All Keyboard events apply to forms and controls that have focus A form can receive focus only if it contains no controls or if all visible controls are disabled and cannot get focus The object with focus receives all the keystrokes When the Key Preview form event property is set to Yes, the Keyboard events are invoked for the form before they re invoked for the controls on the form The default setting is No he KeyDown event occurs when you press any key on the keyboard while the form or control has focus
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Applies To Forms, reports Forms, reports
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When It Occurs When a form or report becomes the active window by opening it, by clicking it, or by clicking a control on a form When a different Access window replaces the form or report as the active window, but before it becomes the active window Doesn t occur when focus moves to a window in another application, a dialog box, or a pop-up form Before a control receives focus from another control or as the first control in a newly opened form Occurs before the GotFocus event When a control receives focus or a form with no active or enabled controls receives focus When a form or control loses focus
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TABLE 18-2 Common Focus Events
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18:
Understanding Events and the Event Model
The KeyPress event occurs when you press and release a key or any key combination that produces a standard ANSI character while the form or control has focus The KeyUp event occurs when you release a pressed key while a form or control has focus The object that has focus receives the keystrokes Holding the key down causes repeated KeyDown or KeyPress events If you re using the KeyUp event, holding the key down causes the KeyUp to occur after all the KeyDown and KeyPress events have occurred All these key events occur when you send a keystroke to a form or control using a macro with the SendKey action KeyUp and KeyDown are often used to recognize function keys; navigation keys; key combinations that use ctrl, shift, or alt with another key; and number keys from the keyboard or the number keypad KeyUp and KeyDown don t occur when you press enter if the form has a command button whose Default property is Yes Pressing enter is the same as clicking the command button KeyUp and KeyDown also don t occur when you press esc if the Cancel property is set to Yes The KeyPress event doesn t indicate the physical state of the keyboard; it indicates only the character pressed The event accepts any printable character, ctrl combined with a character, enter, or backspace
PART III
TIP Pressing backspace results in an ANSI character and triggers the KeyPress event, but pressing
does not
Mouse Events
All the mouse events (see Table 18-3) apply to both forms and controls Again, a form itself can receive focus only if it contains no controls or if all visible controls have been disabled and cannot get focus
Event Click When It Occurs When you click and release the left mouse button on a control or its label When you click a record selector or an area outside a section or control in a form When you select a combo box or list box by pressing TAB or an arrow key, and then press ENTER When you press SPACEBAR while a command button, check box, option button, or toggle button has focus When you pass the mouse pointer over a hyperlink and click the left mouse button when the pointer changes to a pointer hand When you click and release the left mouse button twice on a control or its label When you double-click a record selector or a blank area in a form When you click a mouse button while the mouse pointer is on a form or control It also happens when the SHIFT, ALT, or CTRL key is pressed while the mouse button is pressed down When you move the mouse pointer over a form, form section, or control When you release the mouse button while the pointer is on a form or control
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