Custom Dialog

TX Text Control comes with pre-configured dialog boxes to select and insert local images into a document. This article shows how to implement an extension method to use a custom dialog to insert images.

Extension Method

The following extension adds a method CustomDialog to the &#9584; TX Text Control .NET for WPF &#9584; TXTextControl Namespace &#9584; ImageCollection Class An instance of the ImageCollection class contains all images in a Text Control document or part of the document represented through objects of the type Image. " data-tippy-interactive="true" data-tippy-placement="bottom" data-tooltip-width="wide"

>Image Collection .

public static class TextControlExtensions { public static void CustomDialog ( this TXTextControl.ImageCollection images, string preferredFormat = null, bool showAll = true, OpenFileDialog openFileDialog = null) { // create a new open file dialog or use the given one OpenFileDialog dlg = (openFileDialog == null) ? new OpenFileDialog() : openFileDialog;

// retrieve supported filters from Text Control string sImportFormats = images.ImportFilters;

// add an "All Supported Formats" entry with all extensions if (showAll) { var sAllImportFormats = String.Join(";", images.ImportFilters.Split('|') .Where((value, index) => index % 2 == 1) .ToArray());

sImportFormats = "All Supported Formats|" + sAllImportFormats + "|" + sImportFormats; }

// set the filters for the dialog dlg.Filter = sImportFormats;

// select the pre-selected filter if (preferredFormat != null) { var saFinalFilters = dlg.Filter.Split('|').Where( (value, index) => index % 2 == 1).ToArray();

// set the index (0-based) dlg.FilterIndex = Array.FindIndex(saFinalFilters, m => m == preferredFormat) + 1; }

// if file is opened by user, create a new image and insert it if (dlg.ShowDialog() == true) { TXTextControl.Image image = new TXTextControl.Image( System.Drawing.Image.FromFile(dlg.FileName));

images.Add(image, -1); // at input position } } } This method accepts 3 parameters:

Parameter Value Type Value description preferredFormat String The preferred format that should be pre-selected. Sample: "*.png". showAll bool Specifies whether an additional "All Supported Formats" option should be added to the list. openFileDialog OpenFileDialog An OpenFileDialog object that can be pre-configured for additional customization.

Extension Method Usage

The following code opens a custom dialog with the preferred format PNG and without the All Supported Formats option:

textControl1.Images.CustomDialog("*.png", false);

The following call opens the dialog with the All Supported Formats option:

textControl1.Images.CustomDialog(null, true); If you want to change the title, the default directory and other options, you can pass a pre-configured OpenFileDialog to the CustomDialog method:

OpenFileDialog dlg = new OpenFileDialog(); dlg.Title = "My custom title"; dlg.InitialDirectory = "c:\\";

textControl1.Images.CustomDialog(null, false, dlg);

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Custom Dialog

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July 2020

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