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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

PictureEdit.ImageEditorDialogShowing Event

Fires when the Editor dialog is about to be opened. Allows you to customize the dialog and its graphic commands.

Namespace:DevExpress.XtraEditors
Assembly:DevExpress.XtraEditors.v19.1.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type DevExpress.XtraEditors.ImageEditor.ImageEditorDialogShowingEventArgs containing data related to this event.

Expanded Remarks

The PictureEdit control supports basic edit operations on an image in a separate Editor dialog (see the RepositoryItemPictureEdit.ShowEditMenuItem property and ShowImageEditorDialog method).

The ImageEditorDialogShowing event fires when the Editor dialog is about to be opened. It allows you to perform the following:

  • Prevent the dialog from being opened - Set the Cancel event parameter to true.
  • Customize the form (dialog) - You can access this form with the Form event parameter.
  • Access the image that is about to be customized (see the Image parameter).
  • Customize graphic commands in the Editor's main toolbar.

    Use the event's Commands collection to add new and remove existing graphic commands (DevExpress.XtraEditors.ImageEditor.IGraphicCommand objects). After your ImageEditorDialogShowing event handler is complete, the Editor dialog creates buttons in the main toolbar. Each button corresponds to a graphic command in the Commands collection.

Expanded Example

This example shows how to extend the editor with custom graphic commands that add watermarks to the current image.

The steps to add a WatermarkCommand (and other commands) to the image editor are as follows.

  1. Create a new class (WatermarkGraphicOperation) that performs an operation on an image. The operation must be a BaseCachedGraphicOperation descendant. Users can undo and redo BaseCachedGraphicOperations while the image editor is active.

  2. You can allow users to specify the operation's settings in custom controls before the operation is applied. Create a panel with controls and implement the IToolSettingsControl interface for the panel. The IToolSettingsControl.GetOperation method must return the customized graphic operation (WatermarkGraphicOperation).

    This example creates a user control (WatermarkToolControl) with controls to enter the watermark-related settings:

    • a TextEditor to enter the watermark text
    • a ColorEditor to specify the font color
    • a SpinEditor to enter the font size
    • a CheckEditor to allow the watermark text to be repeated throughout the image.
  3. Handle the ImageEditorDialogShowing event to add custom commands (buttons) to the editor's main toolbar.

    In the example two commands are added:

    • WatermarkPreset - Invokes the WatermarkGraphicOperation with predefined settings.
    • WatermarkCommand - Displays the WatermarkToolControl in which users can specify custom watermark settings and then apply the WatermarkGraphicOperation.

Expanded See Also

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