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ADDING PHOTOEDITDLG TO OUR MAIN FORM Now that our new dialog is ready, we need to display it in our MyPhotos application. This section integrates the dialog into our application, much like we integrated the CaptionDlg form in chapter 8. The CaptionDlg form does present a slight problem, in that it already allows the caption to be edited, just like our new PhotoEditDlg form. We could keep this dialog around and provide two ways to edit a photograph s caption. This might be a little confusing to users, so we will instead remove CaptionDlg from our application. The step to remove this dialog follows. We will integrate the PhotoEditDlg dialog into our application in a moment.
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Set the version number of the MyPhotos application to 9.2. REMOVE THE CAPTIONDLG FORM Action 1 In the Solution Explorer window, delete the CaptionDlg form.
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a. Right-click on the CaptionDlg.cs file. b. Select Delete from the popup menu. c. Click OK in the confirmation box.
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Click on the file and press the Delete key.
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After clicking OK, the CaptionDlg.cs class is removed from the project and deleted from the file system.
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With the caption dialog gone, our way is clear to display the PhotoEditDlg form from our main window. We will reuse the menuCaption menu for this purpose, renamed and revamped by the following steps:
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LABELS AND TEXT BOXES
DISPLAY THE PHOTOEDITDLG FORM FROM THE MAIN WINDOW Action 2 3 Double-click the MainForm.cs file in the Solution Explorer window. Modify the properties for the Caption menu item under the Edit menu.
Settings Property (Name) Text Value menuPhotoProp &Photo Properties
Result The Windows Forms Designer window appears for this form.
Note: We could elect to use this menu under its previous name. This could prove confusing in the future, so we instead rename the control in line with its new purpose. 4 5 Rename the Click event for this menu to menuPhotoProp_Click. Replace the old handler with an implementation to display the PhotoEditDlg form. Note: The old handler was called menuCaption_Click.
private void menuPhotoProp_Click (object sender, System.EventArgs e) { if (_album.CurrentPhoto == null) return; using (PhotoEditDlg dlg = new PhotoEditDlg(_album)) { if (dlg.ShowDialog() == DialogResult.OK) { _bAlbumChanged = true; sbpnlFileName.Text = _album.CurrentPhoto.Caption; statusBar1.Invalidate(); } } }
Update the Popup event handler for the Edit menu to use the new menu.
private void menuEdit_Popup (object sender, System.EventArgs e) { menuPhotoProp.Enabled = (_album.Count > 0); }
Since the dialog itself handles the initialization and storage of any changes made by the user, and the using statement disposes of the dialog when we are finished, there is not much work required by our handler. When the user clicks OK, we mark that the album has changed and update the status bar with any new caption entered by the user.
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So let s see if your code actually works. Compile and run the application and open a previously saved album file. Display the Photo Properties dialog. Note in particular the following features: The differences between the read-only and editable text boxes. Label text cannot be highlighted, while text within text boxes can, even when read-only. Use the access key for a label and notice how the following text box receives focus. Press the Enter key while editing a single-line text box. The dialog behaves as if you had clicked the OK button. Press the Enter key while editing within the Notes text box. Since we set the AcceptsReturn property to true, this adds a new line within the Notes box and does not deactivate the window. Right-click on any text box. The default context menu will appear. This context menu contains various commands for editing text, and is shown in figure 9.3. The items in this menu correspond to methods in the TextBoxBase class, as shown in .NET Table 9.2. While our form is working just fine, there are some features missing that might make our dialog a little more friendly. These are the subject of the next section.
Figure 9.3 The standard context menu for TextBox controls, shown here for the Date Taken text box, disables commands that are not currently available.
USING TEXTBOX CONTROLS So let s add some interesting features to our text boxes. Most of the events for TextBox controls are inherited from the Control and TextBoxBase classes. Members 287
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