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UserForm Controls
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Part 5: Manipulating Excel Objects
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Common Properties, Methods, and Events
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Because UserForm controls are objects like the other objects you have already seen, they have a rich collection of properties, methods, and events. Table 19-2 contains a list of the key prop erties, methods, and events that are common to many of the form controls.
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Table 19-2.
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Key Properties, Methods, and Events of the UserForm Controls
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Property: controls the color of the background of the control. Property: contains text that s displayed on the control, but can t be changed by the user. Event: called when the Value property changes. Event: called when the user clicks the control using the mouse. Property: contains text that is displayed when the user hovers the mouse pointer over the control for a moment. Event: called when the user double-clicks the control with the mouse. Property: when True, means that the control can receive the focus and will respond to user input. Event: called just before the control receives the focus from another control on the same form. Event: called just before the control loses the focus to another control on the same form. Property: contains an object reference to a Font object, which defines the characteristics of the text displayed on the control. Property: contains the color used to draw the foreground of the control. Property: contains the height of the control in points. Property: contains the distance between the left edge of the control and the left edge of the form on which the control resides. Property: when True, the user is not permitted to change the value of the control. Property: contains the name of the control. Property: specifies how the control is drawn. Property: specifies the control s relative position in the tab sequence. Property: when True, means that the control will accept the focus when the user tabs to it. Property: contains the distance between the top edge of the control and the top edge of the form on which the control resides. Property: describes the state or content of a control.
Property/Method
BackColor Caption Change Click ControlTipText DblClick Enabled Enter Exit Font ForeColor Height Left Locked Name SpecialEffect TabIndex TabStop Top Value
Part 5: Manipulating Excel Objects
Creating User Forms
Table 19-2.
Key Properties, Methods, and Events of the UserForm Controls
Description
Property: when True, means that the control is displayed on the form. Property: contains the width of the control in points. Method: moves the control to the front (fmTop) or the bottom (fmBottom) of the z-order.
19
Property/Method
Visible Width ZOrder (zPosition)
The Height, Width, Top, and Left properties dictate the physical size and placement of the control on the form. The Enabled property determines if the control can receive the focus, whereas the Visible control determines whether the control will be drawn. When the Locked property is True, the user can manipulate the contents of the control but will be unable to change its value. For instance, setting the Locked property to True means that the user could scroll through a large, multi-line text box to see all of the data. If the Enabled property were set to False, the text box control would still be visible, but the user would be unable to scroll to see any text that isn t currently visible on screen. When two controls overlap, the ZOrder method controls which one is completely visible and which one is partially or totally hidden. Moving a control to the top of the z-order means that it will be displayed last thus ensuring that the control will be visible even if it overlaps any other controls. Likewise, using ZOrder to move a control to the bottom means that it will be rendered first, and any other control that is rendered later might hide this control from view. TabIndex identifies the order in which the focus will shift from one control to the next when the user presses the Tab key, and TabStop determines whether the control will accept the focus or the focus should shift to the control with the next higher TabIndex value. The Enter and Exit events are fired as the focus shifts from one control to the next on the form. The Exit routine contains a single argument called Cancel, which you can set to True to prevent the user from switching to a different control. Tip Checking Information Because the code in the Exit event is only executed when the user switches to another con trol, it s an excellent time to examine the contents of the control to determine if the value is correct. For example, you can verify that the contents of the control are numeric, and if the user entered an invalid value, you can notify the user using a message box and then set the Cancel argument to True, thus preventing the user from switching to a new control on the same form. The exact meaning of the Value property depends on the control, but in general it contains the value associated with the control. When this value changes, the Change event is fired. Remember that the Value property is different from the Caption property in that the Caption property usually represents a block of text that can be changed only by the program, whereas the Value property usually contains information that can be changed by the user interacting with the form. 403
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