GTK之任意拖动窗口中的按钮

一，任意拖动窗口中的按钮

源码：

#include <gtk/gtk.h> GtkWidget *window; GtkWidget *fixed; GtkWidget *button; gboolean drag = FALSE; // 只在左键按下时拖动窗体 gint nX = 0; gint nY = 0; void destroy(GtkWidget *widget, gpointer *data) { gtk_main_quit(); } static gint button_press_event(GtkWidget * widget,GdkEventButton * event, gpointer data) { if (event->button == 1) // 判断是否左键按下 { drag = TRUE; nX = event->x; // 取得鼠标相对于窗口的位置 nY = event->y; } return TRUE; } static gint button_release_event(GtkWidget * widget, GdkEventButton * event,gpointer data) // 鼠标抬起事件 { if (event->button == 1)//第二次按下鼠标左键 drag = FALSE; // gtk_fixed_move(GTK_FIXED(fixed),button,event->x,event->y);/*移动按纽*/ return TRUE; } static gint motion_notify_event(GtkWidget * widget, GdkEventButton * event,gpointer data) // 鼠标移动事件 { if (drag) { //gint x, y; //GtkWidget *window = (GtkWidget *) data; //gtk_window_get_position((GtkWindow *)window, &x, &y); // 取窗体绝对坐标 gtk_fixed_move(GTK_FIXED(fixed),button,widget->allocation.x + event->x - nX,widget->allocation.x + event->y - nY);/*移动按纽*/ // g_print("x=%d;y=%d\n",x + event->x - nX,y + event->y - nY); //gtk_fixed_move(GTK_FIXED(fixed),button,event->x , event->y);/*移动按纽*/ //gtk_window_move((GtkWindow *) window, x + event->x - nX, y + event->y - nY);// 移动窗体 } return TRUE; } int main(int argc, char *argv[]) { gtk_init(&argc,&argv);//初始化 window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_signal_connect (GTK_OBJECT (window), "destroy",(GtkSignalFunc) destroy, NULL); gtk_window_set_title (GTK_WINDOW (window), "button_drag"); //gtk_window_fullscreen(GTK_WINDOW(window)); fixed = gtk_fixed_new();//函数用于创建新的固定容器 gtk_container_add(GTK_CONTAINER(window), fixed); button=gtk_button_new_with_label("Button"); /*创建带标号的按钮*/ //gtk_container_add(GTK_CONTAINER(window),button); /*把按钮加入窗体*/ gtk_fixed_put(GTK_FIXED(fixed), button, 50, 50);//函数将widget放在fixed的由x和y指定的位置。 gtk_widget_set_size_request(button, 80, 35); // 设置按钮获取鼠标事件 gtk_widget_set_events(button, GDK_EXPOSURE_MASK | GDK_LEAVE_NOTIFY_MASK| GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK| GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK); gtk_signal_connect(GTK_OBJECT(button), "button_press_event",(GtkSignalFunc) button_press_event, window); // 加入事件回调 gtk_signal_connect(GTK_OBJECT(button), "button_release_event",(GtkSignalFunc) button_release_event, window); gtk_signal_connect(GTK_OBJECT(button), "motion_notify_event",(GtkSignalFunc) motion_notify_event, window); gtk_widget_show_all(window); gtk_main (); return 0; }