How to set the selected text of combobox align left

Question

Hi all,

       In wpf,the selected text of combobox aligns right by default,but my request needs it algins left.I do not find any properties to set to achieve.I also try the FlowDirection property,but the effect is not my want.

Any reply would be appreciated

Thanks

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aaron

Answer 1

You should be able to use HorizontalContentAlignment="Left"..  Hope that helps

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Matt Hohn

Answer 2

 Thanks for your reply.This property is just for the items of combobox.My request is the selected text of combobox.

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aaron

Answer 3

hi,

 <ComboBox>
       <ComboBox.ItemContainerStyle>
            <Style TargetType="{x:Type SelectedItem}" >
                <Setter Property="HorizontalContentAlignment" Value="Left" />
            </Style>
       </ComboBox.ItemContainerStyle>
</ComboBox>

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Nagarjuna Dilip

Answer 4

I am sorry for describing my request unclearly.Actually ,by default combobox aligns selected value left,but when the selected value is

too long for combobox to show it in its textbox,and the selected value will be displayed  from right to left,so some left characters will be
hidden by textbox,my request is let combobox displays selected value from left to right in its textbox.By the way,my combobox is

editable

thanks

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aaron

Answer 5

Hi aaron,

I can understand your requirement. The problem is not caused by the alignment property but a feature of TextBox. When you set the IsEditable property to true, ComboBox will apply a template with a TextBox. When you select an item, the text of that item will be filled into the TextBox template and all text will be selected. When all the text is selected and the cursor is at the last index, text “aligns to right”.

To workaround this issue, you can handle the DropDownClosed event to change selected text length.
<ComboBox Name="comboBox1" Width="150" IsEditable="True" DropDownClosed="comboBox1_DropDownClosed">
                <ComboBox.Items>
                    <ComboBoxItem Content="abcdefghijklmnopqabcdefghijklmnopqabcdefghijklmnopq"/>
                    <ComboBoxItem Content="abc"/>
                    <ComboBoxItem Content="cde"/>
                </ComboBox.Items>
            </ComboBox>

private void comboBox1_DropDownClosed(object sender, EventArgs e)
        {
            TextBox textBox = (TextBox)GetDescendantByType(this.comboBox1, typeof(TextBox));
            textBox.SelectionStart = 0;
            textBox.SelectionLength = 0;
        }

        public static Visual GetDescendantByType(Visual element, Type type)
        {
            if (element == null) return null;
            if (element.GetType() == type) return element;
            Visual foundElement = null;
            if (element is FrameworkElement)
                (element as FrameworkElement).ApplyTemplate();
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
            {
                Visual visual = VisualTreeHelper.GetChild(element, i) as Visual;
                foundElement = GetDescendantByType(visual, type);
                if (foundElement != null)
                    break;
            }
            return foundElement;
        }
Calling GetDescendantByType method can retrieve the TextBox from ComboBox. Then you can set the SelectionStart and SelectionLength to deselect any letters. That avoid the problem.

Hope it helps.

Sincerely,
Kira Qian

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Answer 6

thanks for your answer

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aaron

Answer 7

perfect solution match, thx.

Answer 8

Set the IsEditable to Flse and you will have the desired behaviour