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Part 5: Manipulating Excel Objects
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Creating User Forms The Column property can be used to reference a particular column or row and column value. If only one argument is supplied to the Column property, you can assign values to the specified column in the list. Notice that the arguments are column number and row number, which is the reverse order of the List property. The AddItem method is typically used to add a new item to the list. You may optionally specify the row where the new row should be placed. (Rows are numbered starting with row 0.) The RemoveItem method removes the specified row from the list. The Clear method removes all items from the list. The TopIndex property contains the index of the first visible row in the list. The ListIndex property contains the index of the currently selected row. It might also have a value of -1, meaning that no row is currently selected. The Click event is called when the user clicks the control. This routine displays the currently selected item in the list when the user clicks the item.
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Private Sub ListBox1_Click() MsgBox ListBox1.ListIndex End Sub
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When the MultiSelect property is set to fmMultiSelectMulti, the user may select more than one item in the list by pressing the spacebar or clicking the desired item. A value of fmMultiSelectExtended allows the user to use the Shift and Ctrl keys to aid in the selection process. Holding the Shift key while moving the mouse pointer adds all the items between the last selected item and the item currently under the mouse pointer. The Ctrl key allows users to click and select multiple nonadjacent items. However, if the user releases both the Shift and Ctrl keys, clicking on a single item will clear the list and mark only the newly selected item. When your program allows multiple items to be selected, you should use the Selected prop erty along with the row number to determine the status of each row. A value of True means that the row is currently selected. Setting the ListStyle property to fmListStylePlain means that the list of items are displayed as a normal list. Selected items are highlighted by changing the item s background color. However, a value of fmListStyleOption means that option buttons (MultiSelect=False) or check boxes (MultiSelect=True) will be displayed in front of each row to simplify the selection process. The Text property contains the currently selected value from the list. If the list has more than one column, the TextColumn property identifies which column will be saved into the Text property. The MatchEntry property determines how the ListBox can be searched. A value of fmMatchEntryFirstLetter means that when the user types a letter, the list is searched for the first row that has a matching character in the first position. Pressing the same character again will locate the second occurrence of the letter as the first character. A value of fmMatchEntryComplete allows the user to select the row by typing the prefix of characters that match the desired entry. A value of fmMatchEntryNone disables the match function. 413
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Part 5: Manipulating Excel Objects
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The ComboBox control is perhaps one of the most complicated controls in Visual Basic. It combines the functions of both a ListBox control and a TextBox control. All the properties and methods discussed in the previous section, The ListBox Control, also apply to the ComboBox control. The only feature of the ListBox control not supported by the ComboBox is the ability to select multiple items from the list. Therefore, the MultiSelect and Selected properties are not available in this control. Also, any of the features related to multi-line text boxes aren t present in the ComboBox control. By default, a ComboBox consists of a text field in which the user can enter characters followed by a drop-down button, which when pressed will display a ListBox containing a list of values that can be selected. By setting the Style property to fmStyleDropDownList, the user may not type a value, but instead must choose one of the values displayed in the drop-down list. The currently selected value is displayed in the text box field. You can also specify when the drop-down button is displayed at the end of the text field by setting the ShowDropButtonWhen property. Possible values include: fmShowDropButtonWhenNever, which hides the drop-down button; fmShowDropButtonWhenFocus, which shows the button only when the control has the focus; and fmShowDropButtonWhenAlways, which means that the button is always displayed. You can also modify the symbol displayed on the drop-down button using the DropButtonStyle property. By default, a down arrow is displayed in the button (fmDropButtonStyleArrow). However, you can also display an ellipsis ( ) by using the fmDropButtonStyleEllipsis or display an underscore (_) by specifying fmDropButtonStyleReduce. Finally, you can leave the button blank by choosing fmDropButtonStylePlain. When AutoSize is True, the control will automatically be expanded to accommodate the longest line; otherwise, the drop-down list will be truncated at the edge of the control. If you merely want to control the width of the drop-down list, you can use the ListWidth property. Be sure to allow sufficient space for a vertical scroll bar when specifying a value for ListWidth.
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