c# barcode scanner usb Understanding Events and the Event Model in Microsoft Office

Printer QR-Code in Microsoft Office Understanding Events and the Event Model

Understanding Events and the Event Model
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If any of the data in a control in the form is changed, the BeforeUpdate and AfterUpdate events for both the form and the control occur before the Exit event for the control takes place and starts the form-closing sequence
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Using Subforms
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All the events that occur for a form also occur for a subform The subform and its data are loaded before the main form, using the same sequence of events The exception is the Activate event, which occurs only for the main form When you close a form that contains a subform, a similar sequence of events occurs, but in reverse order: the form and its records are unloaded before the subform and its records Also, the Deactivate event occurs only for the main form To summarize, the closing events for the main form, the subform, and the controls occur in the following order: 1 The events for the controls on the subform, including Exit and LostFocus 2 The events for the controls on the main form, including the subform control 3 The events for the form, including Deactivate and Close 4 The events for the subform
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PART III
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Keystrokes and Mouse Events
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Keyboard and mouse events are initiated by the user while working in a form or with controls in the form Keyboard events occur when you press a key or a key combination while the form or control has focus A keyboard event also occurs if you use a SendKey macro action or a procedure to send the ANSI character keystroke equivalent to the control Mouse events occur for forms, form sections, and controls on the form when you manipulate the mouse or press one of its buttons Releasing a mouse button also triggers an event
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Using the Keyboard
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The following events occur when you press a key on the keyboard while a control has focus:
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KeyDown KeyPress KeyUp
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If you press the key and hold it down, the KeyDown and KeyPress events alternate repeatedly until you release the key Then the KeyUp event occurs If the key you press isn t an ANSI character, the KeyDown and KeyUp events occur, but not the KeyPress event Pressing and holding down a non-ANSI key causes the KeyDown and KeyUp events to alternate repeatedly If the key you press changes the data in a text box control, the Change event occurs between the KeyPress and KeyUp events If the keystroke moves focus from one control to another, the KeyDown event occurs for the first control, while the KeyPress and KeyUp events occur for the second control For example, if you edit the data in a text box control, and then press tab to move to the next control, the following sequence of events occurs:
KeyDown(control1) BeforeUpdate(control1) AfterUpdate(control1)
Part III:
Improving the Workplace
Exit(control1) LostFocus(control1) Enter(control2) GotFocus(control2) KeyPress(control2) KeyUp(control2)
Using the Mouse
When you place the mouse pointer on a control in a form and click the mouse button, the following events occur
MouseDown MouseUp Click
TIP Notice the Click event doesn t occur until after the MouseUp event
If you use the mouse to move focus from one control to another, the sequence of events is as follows:
Exit(control1) LostFocus(control1) Enter(control2) GotFocus(control2) MouseDown(control2) MouseUp(control2) Click
If you move to another control by other means, such as pressing tab, and then click the mouse button, the Current event for the form occurs between the LostFocus event for the first control and the Enter event for the second When you double-click a mouse button on a control other than a command button, both the Click and DblClick events occur, each with a corresponding MouseUp event, as follows:
MouseDown MouseUp Click DblClick MouseUp
If the control is a command button, a second Click event follows the second MouseUp event The MouseMove event is independent of the other mouse events and occurs when you pass the mouse pointer over the form, a form section, or control The MouseMove event is often used to display ScreenTips and other comments explaining parts of a form
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