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Editable TextBlock in WPF for In-place Editing

, 10 Dec 2008
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An editable TextBlock component that allows for in-place editing of, e.g., items in a TreeView.
Sample Image

Introduction

When renaming folders in the Windows Explorer folder tree, the TextBlock containing the name of the folder changes to a TextBox which allows for editing of the folder name inside of the tree. I couldn't find any complete examples, so I decided to make one myself. The EditableTextBlock control is based on the Annotating an Image in WPF article by Josh Smith.

Using the Code

Basically, the control is made of a TextBlock for displaying the text and a TextBox for editing. The IsInEditMode property described below determines which one is currently shown.

The EditableTextBlock control exposes four properties:

  • string Text - The editable text displayed to the user (note TextFormat below).
  • bool IsEditable - Whether or not the control is editable. If not, it behaves just as a regular TextBlock.
  • bool IsInEditMode - Whether or not the control is currently being edited.
  • string TextFormat - Used if the editable text should be surrounded by more text, like the root node in the screenshot above.

The item labeled 'Item 1.1' in the screenshot is defined in XAML as follows:

<TreeViewItem>
    <TreeViewItem.Header>
        <local:EditableTextBlock Text="Item 1.1" />
    </TreeViewItem.Header>
</TreeViewItem>

In order to let the user edit the contents of the control, you have to set the IsInEditMode property to true. For example, the demo application lets the user edit the selected item in the TreeView when the F2 key is pressed, by using the KeyDown event of the TreeView:

private void treeView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.F2)
        SetCurrentItemInEditMode(true);
}

private void SetCurrentItemInEditMode(bool EditMode)
{
    // Make sure that the SelectedItem is actually a TreeViewItem
    // and not null or something else
    if (treeView1.SelectedItem is TreeViewItem)
    {
        TreeViewItem tvi = treeView1.SelectedItem as TreeViewItem;

        // Also make sure that the TreeViewItem
        // uses an EditableTextBlock as its header
        if (tvi.Header is EditableTextBlock)
        {
            EditableTextBlock etb = tvi.Header as EditableTextBlock;

            // Finally make sure that we are
            // allowed to edit the TextBlock
            if (etb.IsEditable)
                etb.IsInEditMode = EditMode;
        }
    }
}

The control leaves edit mode when one of four things happen:

  • The control loses focus, e.g., when the user clicks on another control.
  • The user hits the Enter key, in which case the edited text is saved in the Text property.
  • The user hits the Escape key, in which case the original text, from before the editing started, is restored.
  • The IsInEditMode property is manually set to false.

The TextFormat Property

The TextFormat property uses the String.Format function to format the text, which means that the editable text is referenced by {0} inside a string. For example, the root node in the demo application is defined in XAML as follows:

<TreeViewItem>
    <TreeViewItem.Header>
        <local:EditableTextBlock Text="Root" TextFormat="Root Item '{0}'" />
    </TreeViewItem.Header>
</TreeViewItem>

If the TextFormat property is set to either the empty string (""), the string containing only {0} ("{0}"), or is not set at all, the control simply shows the string from the Text property.

History

  • December 8, 2008 - Created the article
  • December 8, 2008 - Updated source code

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Comments and Discussions

 
QuestionCould you update the namespace of the source code, so everyone can download and run? Pinmemberleiyangge12-Jan-14 21:26 
GeneralMy vote of 2 [modified] PinmemberIvan Krivyakov20-Aug-13 13:21 
QuestionRe: My vote of 2 PinmemberZoner9-Feb-14 23:34 
AnswerProject Sample not Compiling - SOLUTION ! PinmemberMember 799428912-Mar-13 9:31 
GeneralRe: Project Sample not Compiling - SOLUTION ! PinmemberBogdan Maksimović1-Aug-13 3:03 
GeneralMy vote of 4 Pinmemberanna.novikova19-Mar-12 7:58 
GeneralIn order to build the sample Pinmemberrencels17-Apr-11 6:12 
QuestionEvents lost?? Pinmemberjamluke19-Nov-10 3:40 
GeneralPressing F2 to edit Pinmembercmmello10-Nov-10 5:38 
GeneralMy vote of 1 Pinmembercodddddd5-Nov-10 7:11 
GeneralMy vote of 1 PinmemberPJBadenhorst3-May-10 0:06 
GeneralMy vote of 4 PinmemberChristian Rodemeyer31-Jan-10 23:40 
GeneralRe: My vote of 4 Pinmemberbscaer14-Oct-10 7:32 
QuestionMultiline ? Pinmemberpbisiac27-Jan-10 0:58 
GeneralMy vote of 1 PinmemberDeni8415-Jan-10 3:07 
GeneralUsing HierarchicalDataTemplate Problem Pinmemberarchmisha8-Dec-09 12:33 
GeneralRe: Using HierarchicalDataTemplate Problem Pinmemberboetor14-Dec-09 21:58 
QuestionRe: Using HierarchicalDataTemplate Problem Pinmemberpiotri8530-Dec-09 6:20 
AnswerRe: Using HierarchicalDataTemplate Problem Pinmemberjamluke19-Nov-10 3:16 
GeneralRe: Using HierarchicalDataTemplate Problem Pinmembercohoman18-Mar-11 4:16 
AnswerRe: Using HierarchicalDataTemplate Problem PinmemberMember 809702021-Jul-11 7:23 
AnswerRe: Using HierarchicalDataTemplate Problem [modified] Pinmemberandhome222-Jun-12 11:15 
GeneralRe: Using HierarchicalDataTemplate Problem PinmemberSam Bomb4-Jul-12 1:15 
GeneralBinding IsInEditMode PinmemberPatrick Goergen29-Sep-09 6:34 
Hi,
 
I was wondering if anyone has had success binding the IsInEditMode property?
 
I am using TwoWay binding and IsInEditMode seems to be getting updated when I change my bound member (which uses INotifyPropertyChanged) but the EditableTextBlock does not become editable, though the IsInEditMode dependency shows true.
 
Any help would be awesome.
 
Thanks,
Patrick
GeneralRe: Binding IsInEditMode Pinmembereliprand28-Jan-10 7:09 
Generalmy vote is 5 PinmemberKunalChowdhury4-Aug-09 1:24 
QuestionBinding to collection lost after edit item PinmemberJeff4331-Jul-09 14:17 
AnswerRe: Binding to collection lost after edit item PinmemberJeff439-Aug-09 8:18 
GeneralDep. Properties Pinmembermscholz17-Jun-09 20:21 
GeneralClick-to-Edit modification PinmemberRon Dunant29-Mar-09 17:36 
GeneralRe: Click-to-Edit modification Pinmemberjholland878-Sep-11 10:22 
GeneralBinding Mode PinmemberEd Havelaar20-Jan-09 15:37 
GeneralNot able to run Application PinmemberMember 142043910-Jan-09 21:36 
GeneralRe: Not able to run Application Pinmemberwest18824-Jan-09 16:41 
GeneralBuilding sample PinmemberRod Cullison24-Dec-08 4:25 
QuestionHow do you bind to the Text property Pinmembermasontwo8-Dec-08 8:37 
AnswerRe: How do you bind to the Text property PinmemberJesper Borgstrup8-Dec-08 9:03 
GeneralRe: How do you bind to the Text property PinmemberDaggs8-Dec-08 15:20 

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