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kmaestrokmaestro
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added examples on c
1 parent 9c45de0 commit bacc3ef

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lines changed

‎example/c/cairo/Makefile

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CC := clang
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CFLAGS = `pkg-config --cflags gtk+-3.0`
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LIBS = `pkg-config --libs gtk+-3.0`
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src = main.c
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obj = cairo_paint
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targets = cairo_paint
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all: $(targets)
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cairo_paint: $(src)
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$(CC) -o $(obj) $(src) $(CFLAGS) $(LIBS)
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clean:
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rm -f $(targets) *.o *.*~

‎example/c/cairo/main.c

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#include <gtk/gtk.h>
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static cairo_surface_t *s_cairo_surface = NULL;
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static void clear_surface ()
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{
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cairo_t *cr = cairo_create (s_cairo_surface);
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_destroy (cr);
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}
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static void draw_brush (GtkWidget *widget, gdouble x, gdouble y)
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{
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#define BRUSH_SIZE 10
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cairo_t *cr = cairo_create (s_cairo_surface);
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cairo_rectangle (cr, x - BRUSH_SIZE / 2, y - BRUSH_SIZE / 2, BRUSH_SIZE, BRUSH_SIZE);
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cairo_fill (cr);
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cairo_destroy (cr);
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gtk_widget_queue_draw_area (widget, x - BRUSH_SIZE / 2, y - BRUSH_SIZE / 2, BRUSH_SIZE, BRUSH_SIZE);
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}
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static gboolean configure_event_cb (GtkWidget *widget, GdkEventConfigure *event, gpointer data)
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{
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if (s_cairo_surface != NULL)
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cairo_surface_destroy (s_cairo_surface);
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s_cairo_surface = gdk_window_create_similar_surface (
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gtk_widget_get_window (widget),
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CAIRO_CONTENT_COLOR,
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gtk_widget_get_allocated_width (widget),
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gtk_widget_get_allocated_height (widget));
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clear_surface ();
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return TRUE;
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}
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static gboolean cb_draw (GtkWidget *widget, cairo_t *cr, gpointer data)
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{
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cairo_set_source_surface (cr, s_cairo_surface, 0, 0);
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cairo_paint (cr);
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return TRUE;
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}
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static gboolean cb_button_press_event (GtkWidget *widget, GdkEventButton *event, gpointer data)
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{
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if (s_cairo_surface == NULL)
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return FALSE;
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if (event->button == GDK_BUTTON_PRIMARY)
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draw_brush (widget, event->x, event->y);
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else if (event->button == GDK_BUTTON_SECONDARY) {
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clear_surface ();
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gtk_widget_queue_draw (widget);
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}
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return TRUE;
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}
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static gboolean cb_motion_notify_event (GtkWidget *widget, GdkEventMotion *event, gpointer data)
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{
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if (s_cairo_surface == NULL)
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return FALSE;
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if (event->state & GDK_BUTTON1_MASK)
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draw_brush (widget, event->x, event->y);
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return TRUE;
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}
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static void cb_window_destory ()
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{
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if (s_cairo_surface != NULL)
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cairo_surface_destroy (s_cairo_surface);
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}
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static void cb_application_activate (GtkApplication* app, gpointer user_data)
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{
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GtkBuilder* builder = gtk_builder_new ();
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g_return_if_fail (builder != NULL);
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GError* error = NULL;
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if (!gtk_builder_add_from_file (builder, "./main.glade", &error)) {
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if (error) {
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g_error ("Failed to load: %s", error->message);
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g_error_free (error);
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return ;
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}
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}
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GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (gtk_builder_get_object (builder, "application_window"));
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g_warn_if_fail (window != NULL);
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g_object_set (window, "application", app, NULL);
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gtk_window_set_title (GTK_WINDOW (window), "2D графика Краска с Каиром");
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g_signal_connect (window, "destroy", G_CALLBACK (cb_window_destory), NULL);
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{
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GtkWidget *drawing_area = GTK_WIDGET (gtk_builder_get_object (builder, "drawing_area"));
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g_warn_if_fail (drawing_area != NULL);
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g_signal_connect (drawing_area, "draw", G_CALLBACK (cb_draw), NULL);
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g_signal_connect (drawing_area, "configure-event", G_CALLBACK (configure_event_cb), NULL);
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g_signal_connect (drawing_area, "motion-notify-event", G_CALLBACK (cb_motion_notify_event), NULL);
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g_signal_connect (drawing_area, "button-press-event", G_CALLBACK (cb_button_press_event), NULL);
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gtk_widget_set_events (drawing_area, gtk_widget_get_events (drawing_area)
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| GDK_BUTTON_PRESS_MASK
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| GDK_POINTER_MOTION_MASK);
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}
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gtk_widget_show_all (GTK_WIDGET (window));
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g_object_unref (builder);
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}
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int main (int argc, char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk3.cairo", G_APPLICATION_FLAGS_NONE);
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g_signal_connect (app, "activate", G_CALLBACK (cb_application_activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}

‎example/c/cairo/main.glade

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<?xml version="1.0" encoding="UTF-8"?>
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<!-- Generated with glade 3.22.1 -->
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<interface>
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<requires lib="gtk+" version="3.20"/>
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<object class="GtkApplicationWindow" id="application_window">
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<property name="can_focus">False</property>
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<property name="width_request">480</property>
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<property name="height_request">240</property>
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<child>
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<placeholder/>
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</child>
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<child>
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<object class="GtkBox">
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<property name="visible">True</property>
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<property name="can_focus">False</property>
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<property name="orientation">vertical</property>
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<child>
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<object class="GtkDrawingArea" id="drawing_area">
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<property name="visible">True</property>
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<property name="can_focus">False</property>
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</object>
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<packing>
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<property name="expand">True</property>
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<property name="fill">True</property>
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<property name="position">0</property>
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</packing>
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</child>
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</object>
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</child>
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</object>
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</interface>

‎example/c/custom-widget/GtkListBoxItem.c

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#include <gtk/gtk.h>
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#include "GtkListBoxItem.h"
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/**
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*[refs]: https://developer.gnome.org/gtk3/stable/GtkWidget.html
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* Building composite widgets from template XML
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*/
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G_DEFINE_TYPE_WITH_PRIVATE (GtkListBoxItem, gtk_listbox_item, GTK_TYPE_LIST_BOX_ROW);
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static void gtk_listbox_item_class_init (GtkListBoxItemClass *klass)
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{
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gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS(klass),
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"/gtk/examples/custom-widget/GtkListBoxItem.glade");
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gtk_widget_class_bind_template_child_private (GTK_WIDGET_CLASS(klass),
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GtkListBoxItem, label_no);
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gtk_widget_class_bind_template_child_private (GTK_WIDGET_CLASS(klass),
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GtkListBoxItem, label_body);
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}
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static void gtk_listbox_item_init (GtkListBoxItem *self)
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{
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self->priv = (GtkListBoxItemPrivate *) gtk_listbox_item_get_instance_private (GTK_LISTBOX_ITEM (self));
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gtk_widget_init_template (GTK_WIDGET (self));
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}
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GtkListBoxItem *gtk_listbox_item_new (gint index, const gchar *str)
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{
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GtkListBoxItem *row =
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GTK_LISTBOX_ITEM (g_object_new (gtk_listbox_item_get_type (), NULL));
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g_warn_if_fail (row != NULL);
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g_warn_if_fail (row->priv != NULL);
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g_warn_if_fail (row->priv->label_body != NULL);
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{
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gchar idx[16];
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memset (idx, 0x0, 16);
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sprintf (idx, "%d", index);
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gtk_label_set_text (row->priv->label_no, idx);
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}
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gtk_label_set_text (row->priv->label_body, str);
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return row;
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}

‎example/c/custom-widget/GtkListBoxItem.h

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#ifndef __GTK_LISTBOX_ITEM_H__
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#define __GTK_LISTBOX_ITEM_H__
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#include <gtk/gtk.h>
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#define GTK_TYPE_LISTBOX_ITEM\
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(gtk_listbox_item_get_type())
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#define GTK_LISTBOX_ITEM(listbox_row)\
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(G_TYPE_CHECK_INSTANCE_CAST((listbox_row), GTK_TYPE_LISTBOX_ITEM, GtkListBoxItem))
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#define GTK_LISTBOX_ITEM_CLASS(klass)\
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(G_TYPE_CHECK_CLASS_CAST((klass), GTK_TYPE_LISTBOX_ITEM, GtkListBoxItemClass))
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GType gtk_listbox_item_get_type (void) G_GNUC_CONST;
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typedef struct {
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GtkListBoxRowClass parent_class;
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} GtkListBoxItemClass;
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typedef struct {
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GtkLabel *label_no;
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GtkLabel *label_body;
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} GtkListBoxItemPrivate;
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typedef struct {
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GtkListBoxRow parent;
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GtkListBoxItemPrivate *priv;
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} GtkListBoxItem;
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extern GtkListBoxItem *gtk_listbox_item_new (gint index, const gchar *str);
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#endif // __GTK_LISTBOX_ITEM_H__

‎example/c/custom-widget/Makefile

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CC := clang
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CFLAGS = `pkg-config --cflags gtk+-3.0`
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LIBS = `pkg-config --libs gtk+-3.0`
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targets = custom_widget
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obj = custom_widget
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src = custom_widget.c GtkListBoxItem.c resources.c
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all: $(targets)
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custom_widget: $(src)
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$(CC) -o $(obj) $(src) $(CFLAGS) $(LIBS)
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clean:
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rm -f $(targets) *.o *.*~

‎example/c/custom-widget/custom_widget.c

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#include <gtk/gtk.h>
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#include "GtkListBoxItem.h"
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static gboolean cb_item_selected (GtkListBox *listbox, GtkListBoxItem *row, gpointer user_data)
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{
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if (row != NULL) {
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const gint index = gtk_list_box_row_get_index (GTK_LIST_BOX_ROW (row));
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g_print ("item selected -> No.%d %s\n", index, gtk_label_get_text (row->priv->label_body));
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}
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return TRUE;
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}
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static void cb_app_activate (GtkApplication* app, gpointer user_data)
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{
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GtkBuilder* builder = gtk_builder_new ();
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g_return_if_fail (builder != NULL);
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GError* error = NULL;
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if (!gtk_builder_add_from_file (builder, "./res/main.glade", &error)) {
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if (error) {
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g_error ("Failed to load: %s", error->message);
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g_error_free (error);
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return ;
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}
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}
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GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (gtk_builder_get_object (builder, "application_window"));
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g_warn_if_fail (window != NULL);
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g_object_set (window, "application", app, NULL);
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GtkWidget *listbox = GTK_WIDGET (gtk_builder_get_object (builder, "listbox"));
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g_warn_if_fail (listbox != NULL);
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g_signal_connect (listbox, "row-selected", G_CALLBACK (cb_item_selected), NULL);
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for (int i = 0; i < 10; i++) {
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static const gchar items[][256] = {
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"суши",
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"стейк",
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"Карри и рис",
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"гамбургер",
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"Удон",
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"Жареная курица",
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"гречиха",
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"Жареный рис",
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"Жареный рис",
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"Миска с морепродуктами",
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};
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GtkListBoxItem *item = gtk_listbox_item_new (i, items[i]);
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gtk_container_add (GTK_CONTAINER (listbox), GTK_WIDGET (item));
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}
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gtk_widget_show_all (GTK_WIDGET (window));
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g_object_unref (builder);
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}
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int main (int argc, char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk3.custom-widget", G_APPLICATION_FLAGS_NONE);
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g_signal_connect (app, "activate", G_CALLBACK (cb_app_activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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