Linux GTK绘图区域小部件不显示在使用TinyCore的窗口中
我刚刚开始使用TinyCore Linux和GTK+3,正在阅读并尝试一系列不同的教程。我正在尝试GTK网站()中的示例代码,但它不起作用。我能够编译,但弹出一条警告: 警告:“gdk_window_get_pointer”已弃用(声明于/usr/local/include/gtk-3.0/gdk/gdkwindow.h:837):使用“gdk_window_get_device_position”[-Wdeprecated声明] 当我运行程序时,窗口弹出,但没有绘图区域。我用同样的代码在Ubuntu机器上编译了它,它运行得很好,甚至没有显示关于贬值函数的警告。如果您对导致绘图区域无法显示的原因有任何想法,我们将不胜感激。感谢您抽出时间阅读本文Linux GTK绘图区域小部件不显示在使用TinyCore的窗口中,linux,gtk,gtk3,Linux,Gtk,Gtk3,我刚刚开始使用TinyCore Linux和GTK+3,正在阅读并尝试一系列不同的教程。我正在尝试GTK网站()中的示例代码,但它不起作用。我能够编译,但弹出一条警告: 警告:“gdk_window_get_pointer”已弃用(声明于/usr/local/include/gtk-3.0/gdk/gdkwindow.h:837):使用“gdk_window_get_device_position”[-Wdeprecated声明] 当我运行程序时,窗口弹出,但没有绘图区域。我用同样的代码在Ubu
#include <gtk/gtk.h>
/* Surface to store current scribbles */
static cairo_surface_t *surface = NULL;
static void
clear_surface (void)
{
cairo_t *cr;
cr = cairo_create (surface);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_destroy (cr);
}
/* Create a new surface of the appropriate size to store our scribbles */
static gboolean
configure_event_cb (GtkWidget *widget,
GdkEventConfigure *event,
gpointer data)
{
if (surface)
cairo_surface_destroy (surface);
surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
CAIRO_CONTENT_COLOR,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
/* Initialize the surface to white */
clear_surface ();
/* We've handled the configure event, no need for further processing. */
return TRUE;
}
/* Redraw the screen from the surface. Note that the ::draw
* signal receives a ready-to-be-used cairo_t that is already
* clipped to only draw the exposed areas of the widget
*/
static gboolean
draw_cb (GtkWidget *widget,
cairo_t *cr,
gpointer data)
{
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
return FALSE;
}
/* Draw a rectangle on the surface at the given position */
static void
draw_brush (GtkWidget *widget,
gdouble x,
gdouble y)
{
cairo_t *cr;
/* Paint to the surface, where we store our state */
cr = cairo_create (surface);
cairo_rectangle (cr, x - 3, y - 3, 6, 6);
cairo_fill (cr);
cairo_destroy (cr);
/* Now invalidate the affected region of the drawing area. */
gtk_widget_queue_draw_area (widget, x - 3, y - 3, 6, 6);
}
/* Handle button press events by either drawing a rectangle
* or clearing the surface, depending on which button was pressed.
* The ::button-press signal handler receives a GdkEventButton
* struct which contains this information.
*/
static gboolean
button_press_event_cb (GtkWidget *widget,
GdkEventButton *event,
gpointer data)
{
/* paranoia check, in case we haven't gotten a configure event */
if (surface == NULL)
return FALSE;
if (event->button == GDK_BUTTON_PRIMARY)
{
draw_brush (widget, event->x, event->y);
}
else if (event->button == GDK_BUTTON_SECONDARY)
{
clear_surface ();
gtk_widget_queue_draw (widget);
}
/* We've handled the event, stop processing */
return TRUE;
}
/* Handle motion events by continuing to draw if button 1 is
* still held down. The ::motion-notify signal handler receives
* a GdkEventMotion struct which contains this information.
*/
static gboolean
motion_notify_event_cb (GtkWidget *widget,
GdkEventMotion *event,
gpointer data)
{
/* paranoia check, in case we haven't gotten a configure event */
if (surface == NULL)
return FALSE;
if (event->state & GDK_BUTTON1_MASK)
draw_brush (widget, event->x, event->y);
/* We've handled it, stop processing */
return TRUE;
}
static void
close_window (void)
{
if (surface)
cairo_surface_destroy (surface);
gtk_main_quit ();
}
int
main (int argc,
char *argv[])
{
GtkWidget *window;
GtkWidget *frame;
GtkWidget *da;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Drawing Area");
g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
gtk_container_set_border_width (GTK_CONTAINER (window), 8);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_container_add (GTK_CONTAINER (window), frame);
da = gtk_drawing_area_new ();
/* set a minimum size */
gtk_widget_set_size_request (da, 100, 100);
gtk_container_add (GTK_CONTAINER (frame), da);
/* Signals used to handle the backing surface */
g_signal_connect (da, "draw",
G_CALLBACK (draw_cb), NULL);
g_signal_connect (da,"configure-event",
G_CALLBACK (configure_event_cb), NULL);
/* Event signals */
g_signal_connect (da, "motion-notify-event",
G_CALLBACK (motion_notify_event_cb), NULL);
g_signal_connect (da, "button-press-event",
G_CALLBACK (button_press_event_cb), NULL);
/* Ask to receive events the drawing area doesn't normally
* subscribe to. In particular, we need to ask for the
* button press and motion notify events that want to handle.
*/
gtk_widget_set_events (da, gtk_widget_get_events (da)
| GDK_BUTTON_PRESS_MASK
| GDK_POINTER_MOTION_MASK);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
#包括
/*用于存储当前涂鸦的曲面*/
静态cairo_surface_t*surface=NULL;
静态空隙
清除表面(空隙)
{
开罗*cr;
cr=cairo_创建(曲面);
cairo_set_source_rgb(cr,1,1,1);
开罗漆(cr);
开罗大学(cr);
}
/*创建一个大小合适的新曲面来存储我们的涂鸦*/
静态gboolean
配置事件cb(GtkWidget*小部件,
GdkEventConfigure*事件,
gpointer数据)
{
如果(表面)
开罗·表面·破坏(表面);
曲面=gdk_窗口_创建_相似_曲面(gtk_小部件_获取_窗口(小部件)),
开罗(内容)(颜色),,
gtk_小部件_获取_分配的_宽度(小部件),
gtk_小部件_获取_分配_高度(小部件));
/*将曲面初始化为白色*/
清除表面();
/*我们已处理配置事件,无需进一步处理*/
返回TRUE;
}
/*从表面重新绘制屏幕。注意::draw
*信号接收一个已准备好使用的CAROU\t
*剪裁为仅绘制小部件的暴露区域
*/
静态gboolean
draw_cb(GtkWidget*小部件,
开罗,
gpointer数据)
{
cairo_集_源_曲面(cr,曲面,0,0);
开罗漆(cr);
返回FALSE;
}
/*在给定位置的曲面上绘制一个矩形*/
静态空隙
画笔(GtkWidget*小部件,
gdouble x,
gdouble y)
{
开罗*cr;
/*在我们存储状态的表面上涂漆*/
cr=cairo_创建(曲面);
cairo_矩形(cr,x-3,y-3,6,6);
开罗填料(cr);
开罗大学(cr);
/*现在使绘图区域的受影响区域无效*/
gtk_小部件_队列_绘图区(小部件,x-3,y-3,6,6);
}
/*通过绘制一个矩形来处理按钮按下事件
*或清除表面,取决于按下哪个按钮。
*::按钮按下信号处理程序接收GdkEventButton
*包含此信息的结构。
*/
静态gboolean
按钮按下事件cb(GtkWidget*小部件,
GdkEventButton*事件,
gpointer数据)
{
/*偏执狂检查,以防我们没有收到配置事件*/
如果(曲面==NULL)
返回FALSE;
如果(事件->按钮==GDK\U按钮\U主)
{
画笔(小部件,事件->x,事件->y);
}
else if(事件->按钮==GDK\U按钮\U辅助)
{
清除表面();
gtk_小部件_队列_绘制(小部件);
}
/*我们已处理该事件,请停止处理*/
返回TRUE;
}
/*如果按钮1处于激活状态,则通过继续绘制来处理运动事件
*还是压着。::motion notify信号处理程序接收
*包含此信息的GdkEventMotion结构。
*/
静态gboolean
运动通知事件cb(GtkWidget*小部件,
GdkEventMotion*事件,
gpointer数据)
{
/*偏执狂检查,以防我们没有收到配置事件*/
如果(曲面==NULL)
返回FALSE;
如果(事件->状态和GDK_按钮1_掩码)
画笔(小部件,事件->x,事件->y);
/*我们已经处理好了,停止处理*/
返回TRUE;
}
静态空隙
关闭窗口(无效)
{
如果(表面)
开罗·表面·破坏(表面);
gtk_main_quit();
}
int
主(内部argc,
字符*argv[]
{
GtkWidget*窗口;
GtkWidget*框架;
GtkWidget*da;
gtk_init(&argc,&argv);
窗口=gtk_窗口_新建(gtk_窗口_顶层);
gtk_窗口设置标题(gtk_窗口(窗口),“绘图区域”);
g_信号连接(窗口,“销毁”,g_回调(关闭窗口),空);
gtk_容器_设置_边框_宽度(gtk_容器(窗口),8);
frame=gtk_frame_new(空);
gtk_帧_集_阴影_类型(gtk_帧(帧),gtk_阴影_-IN);
gtk_容器添加(gtk_容器(窗口),框架);
da=gtk_图纸_区域_新();
/*设定最小尺寸*/
gtk小部件设置大小请求(da,100100);
gtk_容器添加(gtk_容器(框架),da);
/*用于处理背衬表面的信号*/
g_信号连接(da,“牵引”,
G_回调(draw_cb),空;
g_信号_连接(da,“配置事件”,
G_回调(配置_事件_cb),NULL);
/*事件信号*/
g_信号连接(da,“运动通知事件”,
G_回调(运动通知事件cb),空;
g_信号连接(da,“按钮按下事件”,
G_回调(按钮按下事件断路器),NULL);
/*请求接收绘图区域不正常的事件
*订阅。特别是,我们需要请求
*按钮按下和运动通知要处理的事件。
*/
gtk_小部件设置_事件(da,gtk_小部件获取_事件(da)
|GDK_按钮_按下_遮罩
|GDK_指针_运动_遮罩);
gtk_小部件_全部显示(窗口);
gtk_main();
返回0;
}
我重新安装,警告信息消失,但绘图区域仍然拒绝显示。我最终尝试将默认颜色深度更改为16位颜色de