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Deleting specific content from a text entry is easy with gtk_editable_delete_text(). It will remove all of the text between the two positions specified but not the character at the end position. void gtk_editable_delete_text (GtkEditable *editable, gint start_pos, gint end_pos); When using gtk_editable_delete_text(), the order of the positions that you specify does not matter. Also, if you specify -1 as the end position, the characters from the start position to the end of the text will be deleted. If you need a specific region of text to be selected automatically, this can be done with gtk_editable_select_region(). As with deleting text, an end position of -1 will select all of the text from the start position to the end of the content. Manual and automatic selections are what facilitate the following few functions. void gtk_editable_select_region (GtkEditable *editable, gint start_pos, gint end_pos); Once you are able to select text, it would be useful to be able to delete the selection. This is very easy to do with gtk_editable_delete_selection(). This function will delete all of the selected text, leaving any nonselected text.
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CHAPTER 4 BASIC WIDGETS
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void gtk_editable_delete_selection (GtkEditable *editable); In addition to retrieving the whole textual content of the widget, it is possible to retrieve only a section of the text with gtk_editable_get_chars(). This will return a copy of the specified string, which must be freed with g_free() when you are finished with it. gchar* gtk_editable_get_chars (GtkEditable *editable, gint start_pos, gint end_pos); The following three functions perform various clipboard functions. There are keyboard accelerators for cutting (Ctrl+X), copying (Ctrl+C), and pasting (Ctrl+V) built into entries by default. Therefore, you will not usually need to implement clipboard functionality when using a GtkEntry widget. void gtk_editable_cut_clipboard (GtkEditable *editable); void gtk_editable_copy_clipboard (GtkEditable *editable); void gtk_editable_paste_clipboard (GtkEditable *editable);
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The GtkSpinButton widget is a number selection widget that is capable of handling integers and floating-point numbers. It is derived from GtkEntry, so GtkSpinButton inherits all of its functions and signals.
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Before covering the GtkSpinButton widget, you must understand the GtkAdjustment class. GtkAdjustment is one of the few classes in GTK+ that is not considered a widget, because it is derived directly from GtkObject. It is used for several widgets including spin buttons, view ports, and the multiple widgets derived from GtkRange. New adjustments are created with gtk_adjustment_new(), although they are usually cast with GTK_ADJUSTMENT() upon initialization, because storage as a GtkObject is not practical. Once added to a widget, memory management of the adjustment is handled by the widget, so you do not have to worry about this aspect of the object. GtkObject* gtk_adjustment_new (gdouble gdouble gdouble gdouble gdouble gdouble initial_value, lower_range, upper_range, step_increment, page_increment, page_size);
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CHAPTER 4 BASIC WIDGETS
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New adjustments are initialized with six parameters. A list of these parameters follows. initial_value: The value stored by the adjustment when it is initialized. This corresponds to the value property of the GtkAdjustment class. lower_range: The minimum value the adjustment will be allowed to hold. This corresponds to the lower property of the GtkAdjustment class. upper_range: The maximum value the adjustment will be allowed to hold. This corresponds to the upper property of the GtkAdjustment class. step_increment: The increment to make the smallest change possible. If you want to count all integers between 1 and 10, the increment would be set to 1. page_increment: The increment to make when Page Up or Page Down is pressed. This is almost always larger than the step_increment. page_size: The size of a page. This value does not have much use in a GtkSpinButton, so it should be set to the same value as page_increment or to 0. There are two useful signals provided by the GtkAdjustment class: changed and valuechanged. The changed signal is emitted when one or more properties of the adjustment have been altered, excluding the value property. The value-changed signal is emitted when the current value of the adjustment has been altered.
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