asp.net ean 13 Figure 10-9. The file browser in Font

Creator Data Matrix 2d barcode in Font Figure 10-9. The file browser

Figure 10-9. The file browser
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CHAPTER 10 DYNAMIC USER INTERFACES
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We could easily just use the GTK_STOCK_JUMP_TO stock item for the button, but instead, I will show you how to use the button as a container. You first need to change the button type to a container in the Properties dialog. This will display an empty container mesh as the content of the button. To create the button in Figure 10-9, a GtkHBox with two child widgets was added to the button: a GtkImage widget set to the GTK_STOCK_JUMP_TO stock image and a GtkLabel widget that says Go. Another important aspect of the address bar is the Current Location GtkLabel widget, which is set to bold. In 2, you learned about the Pango Text Markup Language. By selecting Use markup in a label s preferences dialog, as shown in Figure 10-10, you will be able to use Pango Text Markup Language tags in the label content. If you do not select this option, the markup tags will be rendered as text in the label.
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Figure 10-10. GtkLabel widget properties Below the markup property, you can enable mnemonic labels by setting the Use underline property. In Figure 10-10, mnemonics are turned off, so underscore characters will be shown as text. The last step is to add a GtkScrolledWindow widget to the last cell in the vertical box and a GtkTreeView widget to that container. The completed file browser user interface is shown in Figure 10-11. However, we are not yet finished editing the application in Glade.
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Figure 10-11. The completed file browser
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Making Changes
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The file browser is completely designed, but now I have decided that it should include a GtkStatusBar widget along the bottom of the window! Making changes to the user interface can be tricky, so this section will walk you through a few challenging actions. The first step in adding the status bar is to extend the number of child widgets contained by the main GtkVBox widget. To do this, choose the vertical box from the widget tree view. In the Properties window, you can increase the number of children with the Number of items property in the General tab. This will add a new empty space at the end of the vertical box into which you can add a status bar widget. If you need to reorder the children of a vertical or horizontal box, you first need to select the widget you want to move. Then, under the Packing tab in the Properties window, you can choose a new position by changing the value of its spin button. You will be able to see the child widget moving to its new position as you change spin button s value. The position of surrounding child widgets will automatically be adjusted to reflect the changes. Another problematic task can result if you decide that you need to stuff a container into a location where another widget is already added. For example, let us assume that you have decided to place a horizontal pane in place of the scrolled window in the file browser application. You first need to select the widget from the widget tree view in the main window and remove it by pressing Ctrl+X. After this, an empty box will be displayed, in which you can add the horizontal pane. Next, select the pane where the scrolled window should be placed and press Ctrl+V. Making changes to a user interface used to be a touchy topic with Glade 2, because it did not support undo and redo actions. It used to be very easy to make a mistake and lose hours of work by accidentally deleting your top-level widget, since you could not undo any actions. Now that Glade 3 includes undo and redo support, you do not have to worry as much.
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