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Docs: LCL/stctrls. Updates TCustomComboBox and TComboBox topics to use consistent content.
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@ -1595,7 +1595,9 @@ height items when enabled in settings for the control.
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</element>
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<element name="TCustomComboBox">
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<short>The base class for combo-box components.</short>
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<short>
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The base class for combo-box components.
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</short>
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<descr>
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<p>
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<var>TCustomComboBox</var> is a <var>TWinControl</var> descendant which
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@ -1604,10 +1606,10 @@ Component Library).
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</p>
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<p>
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A combo-box is visually represented as an edit control and a scrollable list
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of items which can be selected. The list can be always visible, or opened
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when needed using a drop-down indicator. In addition, the items in the
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control be drawn using using the built-in mechanisms for the widgetset class
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or using an owner-drawn style.
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of items which can be selected. The list can always be visible, or opened
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when needed using a drop-down indicator. In addition, the items displayed on
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the control be drawn using using the built-in mechanisms for the widgetset
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class or using an owner-drawn style.
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</p>
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<p>
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Despite similarities in appearance to <var>TCustomEdit</var> and
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@ -1615,19 +1617,38 @@ Despite similarities in appearance to <var>TCustomEdit</var> and
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(Delphi compatible).
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</p>
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<p>
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Use the <var>Style</var> property to control the display style and drawing
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mechanism enabled for Items in the control.
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Use <var>Items</var> to access the entries displayed in the drop-down list. Use
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<var>AddItem</var> or <var>AddHistoryItem</var> to add entries to
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the list of items. Use <var>OnGetItems</var> to dynamically populate the Items
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in the control when the drop-down list is displayed.
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</p>
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<p>
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Use properties like <var>AutoComplete</var>, <var>AutoCompleteText</var>, and
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<var>AutoDropDown</var> to control the behavior of the edit field or
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drop-down list in the control.
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The selectable values in <var>Items</var> can be maintained at design-time by
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clicking on the ellipsis character (<b>...</b>) displayed next to Items in the
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Object Inspector.
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</p>
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<p>
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Use <var>Items</var> to access existing list items defined the control. Use
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<var>AddItem</var> or <var>AddHistoryItem</var> to add entries to the list
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items in the control. Use <var>OnGetItems</var> to dynamically populate the
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Items in the control when the drop-down list is displayed.
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The <var>Text</var> property reflects the text entered directly into the edit
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box, or selected either manually or by auto-completion from the Items in the
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list. At run-time, the entry selected from the list replaces the text in the
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edit box, and <var>ItemIndex</var> holds the (zero-based) index number of the
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selected item. If no value is selected from the drop-down list, the default
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text (if any) remains for any information typed directly into the control Text,
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and ItemIndex takes the value of -1.
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</p>
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<p>
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Use <var>Style</var> to control the display style and drawing mechanism enabled
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for the drop-down list on the control.
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</p>
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<p>
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Use <var>AutoDropDown</var>, <var>AutoComplete</var>,
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<var>AutoCompleteText</var>, and <var>AutoDropDown</var> to control the
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behavior of the edit box and its interaction with the drop-down list on the
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control.
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</p>
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<p>
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Use <var>ItemHeight</var> and <var>ItemWidth</var> to control the appearance
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for the Items displayed on the drop-down list.
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</p>
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<p>
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Do not create instances of TCustomComboBox. Use one of the descendent
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@ -1635,10 +1656,19 @@ classes, like <var>TComboBox</var> or <var>TComboBoxEx</var>.
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</p>
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<remark>
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The Height property in TCustomComboBox / TComboBox cannot be changed for some
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platforms, including Windows and macOS Carbon. It is best to set AutoSize to
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platforms, including Windows and macOS. It is best to set AutoSize to
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<b>True</b> to ensure consistent size handling on the supported platforms.
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</remark>
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<remark>
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Changing the value in BorderStyle to bsNone has no effect for the Windows
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widgetset. It is not possible to remove the border on the Windows platform.
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</remark>
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</descr>
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<seealso>
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<link id="TComboBox"/>
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<link id="TWinControl"/>
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<link id="#lcl.comboex.TComboBoxEx">TComboBoxEx</link>
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</seealso>
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</element>
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<element name="TCustomComboBox.FArrowKeysTraverseList"/>
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@ -4293,44 +4323,77 @@ set to <b>True</b> and the mouse is over the control.
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<element name="TComboBox">
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<short>
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A combination of an edit box and a (drop-down) list allowing one of several
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options to be chosen.
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Implements a control with an edit box and a drop-down list allowing one of
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several options to be chosen.
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</short>
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<descr>
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<p>
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The Text property reflects the text entered into the edit box, or selected
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from the list.
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<var>TComboBox</var> is a <var>TCustomComboBox</var> descendant which
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implements the a combo-box component in the LCL (Lazarus Component Library).
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</p>
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<p>
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The selectable values are kept in the <var>Items</var> list. Clicking on the
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ellipsis character (<b>...</b>), next to <var>Items</var> in the Object
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Inspector, opens an editor which allows the designer to populate the Items
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list.
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A combo-box is visually represented as an edit control and a scrollable list
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of items which can be selected. The list can always be visible, or opened
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when needed using a drop-down indicator. In addition, the items displayed on
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the control be drawn using using the built-in mechanisms for the widgetset
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class or using an owner-drawn style.
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</p>
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<p>
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At run-time, the entry selected from the list replaces the text in the edit
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box, and <var>ItemIndex</var> holds the (zero-based) index number of the
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selected item.
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Despite similarities in appearance to <var>TCustomEdit</var> and
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<var>TCustomList</var>, the class inherits no properties from these classes
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(Delphi compatible).
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</p>
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<p>
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If no value is selected from the drop-down list, the default text (if any)
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remains, or any information typed directly into <var>Text</var> will be
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returned, and <var>ItemIndex</var> takes the value of -1.
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Use <var>Items</var> to access the entries displayed in the drop-down list. Use
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<var>AddItem</var> or <var>AddHistoryItem</var> to add entries to
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the list of items. Use <var>OnGetItems</var> to dynamically populate the Items
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in the control when the drop-down list is displayed.
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</p>
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<p>
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The selectable values in <var>Items</var> can be maintained at design-time by
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clicking on the ellipsis character (<b>...</b>) displayed next to Items in the
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Object Inspector.
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</p>
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<p>
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The <var>Text</var> property reflects the text entered directly into the edit
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box, or selected either manually or by auto-completion from the Items in the
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list. At run-time, the entry selected from the list replaces the text in the
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edit box, and <var>ItemIndex</var> holds the (zero-based) index number of the
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selected item. If no value is selected from the drop-down list, the default
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text (if any) remains for any information typed directly into the control Text,
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and ItemIndex takes the value of -1.
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</p>
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<p>
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Use <var>Style</var> to control the display style and drawing mechanism enabled
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for the drop-down list on the control.
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</p>
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<p>
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Use <var>AutoDropDown</var>, <var>AutoComplete</var>,
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<var>AutoCompleteText</var>, and <var>AutoDropDown</var> to control the
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behavior of the edit box and its interaction with the drop-down list on the
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control.
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</p>
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<p>
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Use <var>ItemHeight</var> and <var>ItemWidth</var> to control the appearance
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for the Items displayed on the drop-down list.
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</p>
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<remark>
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The Height property in TComboBox cannot be changed for some platforms, like
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Windows and macOS Carbon. It is best to set AutoSize to <b>True</b> to ensure
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consistent size handling on the supported platforms.
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The Height property in TCustomComboBox / TComboBox cannot be changed for some
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platforms, including Windows and macOS. It is best to set AutoSize to
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<b>True</b> to ensure consistent size handling on the supported platforms.
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</remark>
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<remark>
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Changing the value in BorderStyle to bsNone has no effect for the Windows
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widgetset. It is impossible to remove the border under Windows.
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widgetset. It is not possible to remove the border on the Windows platform.
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</remark>
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</descr>
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<seealso>
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<link id="HowToUseStdCtrls"/>
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<link id="TComboBox.Items"/>
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<link id="TComboBox.ItemIndex"/>
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<link id="TComboBox.Style"/>
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<link id="TComboBox.Text"/>
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<link id="#lcl.comboex.TComboBoxEx">TComboBoxEx</link>
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<link id="HowToUseStdCtrls"/>
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</seealso>
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</element>
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