asp.net mvc qr code generator Exercise 2-2. GObject Property System in Font

Drawer DataMatrix in Font Exercise 2-2. GObject Property System

Exercise 2-2. GObject Property System
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This exercise is very similar to Exercise 2-1, except you need to use the functions provided by the GObject library for changing properties. For example, in the main() function, the title, width, height, and resizability of the GtkWindow widget should be set with g_object_set(). In addition, within the key-press-event callback function, you should use g_object_get() and g_object_set() to interact with the title property of the GtkWindow and the label property of the GtkLabel. You are also instructed to provide notification when the window s title property is changed. Connecting the window to the notify::title signal, which will monitor the value of the given property, can do this. Then, g_message() will output the new window title to standard output. You should see the message in the terminal output if you launch your application from a terminal emulator.
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Exercise 3-1. Using Multiple Containers
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This exercise helps you gain experience using a variety of container widgets that were covered in 3, including GtkNotebook, GtkVBox, and GtkHBox. Let us analyze the content of each of these containers one at a time. The GtkNotebook container should contain four tabs. Each tab in a notebook is associated with a label widget and a child widget. The gtk_notebook_append_page() function can be used to add new pages to a notebook. Each of these tabs should contain a GtkButton widget that is connected to the clicked signal. When a button is clicked, the notebook should move to the next page, wrapping around when the last page is reached. Connecting each clicked signal to the same callback function can do this. Within the callback function, which is called next_tab() in the downloadable solution, you first need to check the page number. If the page number is less than three, you can simply call gtk_notebook_next_page() to move to the next page. Otherwise, you can use gtk_notebook_ set_page() to set the page number to zero. This same method can be used for moving to the previous page in the notebook. The next container is a GtkHBox that holds two buttons. The first button should move to the previous page in the GtkNotebook container when pressed. As previously stated, you can use the same method that was used for moving to the next page for moving to the previous page, although it will have to be reversed. The other button should close the window and exit the application when clicked. These buttons can be packed with gtk_box_pack_end() so that they appear against the right side of the horizontal box instead of the left side.
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APPENDIX F EXERCISE SOLUTIONS AND HINTS
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The last container in the application is a GtkVBox widget that should hold the GtkNotebook and GtkHBox widgets. This vertical box can be packed into the top-level GtkWindow widget to complete the application s user interface.
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Exercise 3-2. Even More Containers
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This exercise solution is very similar to the previous exercise. The first difference is that the GtkNotebook tabs should be hidden with gtk_notebook_set_show_tabs(). Then, a GtkExpander container should be placed between each GtkButton widget and the notebook tab. This will allow you to show and hide the button found in each tab. The expander s label can also be used to tell you which tab is currently displayed. The last difference is that, instead of using a GtkVBox widget to pack the notebook and horizontal box, you should use a GtkVPaned widget. This container will allow you to redistribute the allocated space for each of its two children by dragging the horizontal separator located between the two widgets.
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Exercise 4-1. Renaming Files
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In this exercise, you need to use several widgets that you learned about in 4, including the stock buttons GtkEntry and GtkFileChooserButton. The purpose of this exercise is to allow the user to rename the selected file with a function built into GLib. The first step is to set up your user interface, which includes three interactive widgets. The first is a file chooser button, created with gtk_file_chooser_button_new(). The chooser s action should be set to GTK_FILE_CHOOSER_ACTION_OPEN. This will allow you to select only a single file. The gtk_file_chooser_set_current_folder() function can be used to set the current folder of the file chooser button to the user s home directory, found at g_get_home_dir(). This GtkFileChooserButton widget should be connected to the selection-changed signal. Within its callback function, you need to verify whether the file can be renamed. This can be done with a GLib function called g_access(). The following call can use used within your application: gint mode = g_access (fn, W_OK); If the file cannot be accessed or changed by the current user, the GtkEntry and GtkButton widgets should be disabled. This can be done by sending the opposite Boolean value as mode to gtk_widget_set_sensitive(). The next widget in the exercise is a GtkEntry, which allows the user to enter a new name for the widget. This is a new name for the file excluding the location, since this file name will be appended to the GtkFileChooserButton s location when the file is renamed. The last widget, the GtkButton, should call the renaming function when clicked. Within the button s callback function, you first need to retrieve the current file and location from the file chooser button. The location, along with the content of the GtkEntry widget, can be used to build a new absolute path for the file. Lastly, you should use the g_rename() function to rename the file. You should note that you must include <glib/gstdio.h> for g_rename() to work!
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