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qr code generator in asp.net c# BASIC WIDGETS in Font
CHAPTER 4 BASIC WIDGETS Generating Data Matrix 2d Barcode In None Using Barcode generation for Font Control to generate, create ECC200 image in Font applications. www.OnBarcode.comCode 3 Of 9 Creator In None Using Barcode generation for Font Control to generate, create Code 39 Full ASCII image in Font applications. www.OnBarcode.com Note If the stock item provided to gtk_button_new_from_stock() or any other stock retrieval function Drawing EAN-13 Supplement 5 In None Using Barcode generation for Font Control to generate, create EAN / UCC - 13 image in Font applications. www.OnBarcode.comData Matrix Generator In None Using Barcode generator for Font Control to generate, create ECC200 image in Font applications. www.OnBarcode.comin GTK+ is not found, it will be treated as a mnemonic label. This prevents buttons from being rendered in an unpredictable way. Creating Barcode In None Using Barcode generator for Font Control to generate, create Barcode image in Font applications. www.OnBarcode.comCreating Code 128 In None Using Barcode creator for Font Control to generate, create USS Code 128 image in Font applications. www.OnBarcode.comIt is possible for you to define your own stock icons, but this will not be covered until 9, which covers menus and toolbars. An example of a button using the GTK_STOCK_CLOSE stock item can be seen in Figure 4-1. QR Code Maker In None Using Barcode creation for Font Control to generate, create Denso QR Bar Code image in Font applications. www.OnBarcode.comCode 93 Extended Drawer In None Using Barcode generator for Font Control to generate, create Code 93 Full ASCII image in Font applications. www.OnBarcode.comFigure 4-1. A GTK_STOCK_CLOSE stock item Each stock item can be referred to by its string value or its macro definition. For example, the close stock item used in Listing 4-1 can be referred to as gtk-close or GTK_STOCK_CLOSE. However, the preprocessor directives are merely convenient aliases of the string values, so there is no reason to learn both identifiers. Printing Data Matrix 2d Barcode In Java Using Barcode creation for Java Control to generate, create ECC200 image in Java applications. www.OnBarcode.comScanning DataMatrix In Java Using Barcode reader for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.com Tip You should always use the preprocessor directives, because unsupported items will be flagged when you compile the code. If you use the stock item s string, the compiler will not flag the error, and the invalid icon will be displayed. Universal Product Code Version A Creation In C#.NET Using Barcode generation for .NET framework Control to generate, create Universal Product Code version A image in .NET framework applications. www.OnBarcode.comUPC Code Printer In None Using Barcode creation for Software Control to generate, create UPC-A image in Software applications. www.OnBarcode.comListing 4-1. Stock Items (stockitems.c) button = gtk_button_new_from_stock (GTK_STOCK_CLOSE); g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), (gpointer) window); There are 98 stock items provided by GTK+ as of the release of 2.10. A list of these items can be viewed in Appendix D. We will use stock items again when covering menus and toolbars in 9. It is important to note that some stock items have been added since the release of GTK+ 2.0, so a few items may not be available to you if you are not running the most current version of GTK+. This is essential to keep in mind when creating new applications. Your users may not have the most current version of GTK+! Scanning PDF 417 In None Using Barcode decoder for Software Control to read, scan read, scan image in Software applications. www.OnBarcode.comGS1 128 Scanner In Visual Basic .NET Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comCHAPTER 4 BASIC WIDGETS
Barcode Reader In Java Using Barcode reader for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.comEncode ANSI/AIM Code 39 In Java Using Barcode drawer for Eclipse BIRT Control to generate, create Code 39 Full ASCII image in Eclipse BIRT applications. www.OnBarcode.comToggle Buttons
2D Creator In Visual C# Using Barcode drawer for .NET framework Control to generate, create Matrix image in .NET applications. www.OnBarcode.comRead Code128 In None Using Barcode scanner for Software Control to read, scan read, scan image in Software applications. www.OnBarcode.comThe GtkToggleButton widget is a type of GtkButton that holds its active or inactive state after it is clicked. It is shown as pressed down when active. Clicking an active toggle button will cause it to return to its normal state. There are two widgets derived from GtkToggleButton: GtkCheckButton and GtkRadioButton. You can create a new GtkToggleButton with one of three functions. To create an empty toggle button, use gtk_toggle_button_new(). If you want the toggle button to include a label by default, use gtk_toggle_button_new_with_label(). Lastly, GtkToggleButton also supports mnemonic labels with gtk_toggle_button_new_with_mnemonic(). Figure 4-2 shows two GtkToggleButton widgets that were created with two mnemonic labels by calling the gtk_toggle_button_new_with_mnemonic() initializer. The widgets in the screenshot were created with the code in Listing 4-2. Encoding ECC200 In None Using Barcode creation for Software Control to generate, create Data Matrix ECC200 image in Software applications. www.OnBarcode.comBarcode Creation In None Using Barcode generation for Excel Control to generate, create Barcode image in Excel applications. www.OnBarcode.comFigure 4-2. Two GtkToggleButton widgets In the example in Listing 4-2, when one toggle button is activated, the other is disabled. The only way to make it sensitive is to deactivate the original toggle button. Listing 4-2. Using Toggle Buttons (togglebuttons.c) #include <gtk/gtk.h> static void button_toggled (GtkToggleButton*, GtkWidget*); int main (int argc, char *argv[]) { GtkWidget *window, *vbox, *toggle1, *toggle2; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Toggle Buttons"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); vbox = gtk_vbox_new (TRUE, 5); toggle1 = gtk_toggle_button_new_with_mnemonic ("_Deactivate the other one!"); toggle2 = gtk_toggle_button_new_with_mnemonic ("_No! Deactivate that one!"); CHAPTER 4 BASIC WIDGETS
g_signal_connect (G_OBJECT (toggle1), "toggled", G_CALLBACK (button_toggled), (gpointer) toggle2); g_signal_connect (G_OBJECT (toggle2), "toggled", G_CALLBACK (button_toggled), (gpointer) toggle1); gtk_box_pack_start_defaults (GTK_BOX (vbox), toggle1); gtk_box_pack_start_defaults (GTK_BOX (vbox), toggle2); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show_all (window); gtk_main (); return 0; } /* If the toggle button was activated, set the other as disabled. Otherwise, * enable the other toggle button. */ static void button_toggled (GtkToggleButton *toggle, GtkWidget *other_toggle) { if (gtk_toggle_button_get_active (toggle)) gtk_widget_set_sensitive (other_toggle, FALSE); else gtk_widget_set_sensitive (other_toggle, TRUE); } The only signal added by the GtkToggleButton class is toggled, which is emitted when the user activates or deactivates the button. This signal was triggered in Listing 4-2 by one toggle button in order to disable the other. In Listing 4-2, another important piece of information was shown: multiple widgets can use the same callback function. We did not need to create a separate callback function for each toggle button, since each required the same functionality. It is also possible to connect one signal to multiple callback functions, although this is not recommended. Instead, you should just implement the whole functionality in a single callback function.
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