21、GTK编程：代码示例与列表组件详解

GTK编程：代码示例与列表组件详解

1. 代码示例

在GTK编程中，有许多实用的代码示例可以帮助我们更好地理解和使用GTK库。

1.1 表盘更新代码

以下是一段用于更新表盘的代码：

gpointer data) { GtkDial *dial; g_return_if_fail (adjustment != NULL); g_return_if_fail (data != NULL); dial = GTK_DIAL (data); if ((dial->old_value != adjustment->value) || (dial->old_lower != adjustment->lower) || (dial->old_upper != adjustment->upper)) { gtk_dial_update (dial); dial->old_value = adjustment->value; dial->old_lower = adjustment->lower; dial->old_upper = adjustment->upper; } } static void gtk_dial_adjustment_value_changed (GtkAdjustment *adjustment, gpoi