drawing in a surface (peut servir à éditer)
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182
main.c
182
main.c
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@ -12,33 +12,180 @@
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button = gtk_button_new_with_label (" I "); n fois
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gtk_grid_attach (GTK_GRID (grid), button, 0, 0, 1, 1); n fois */
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//main.c: Dans la fonction « resize_cb »:
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//main.c:48:7: attention: « gdk_surface_create_similar_surface » est obsolète [-Wdeprecated-declarations]
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// 48 | surface = gdk_surface_create_similar_surface (gtk_native_get_surface (gtk_widget_get_native (widget))
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// Deprecated since: 4.12 > Create a suitable cairo image surface yourself.
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#include <gtk/gtk.h>
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static void print (GtkWidget *widget, gpointer data) {g_print (data);}
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/* Surface to store current scribbles */
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static cairo_surface_t *surface = NULL;
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static void activate (GtkApplication *app, gpointer user_data) {
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static void
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clear_surface (void)
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{
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cairo_t *cr;
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cr = cairo_create (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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/* Create a new surface of the appropriate size to store our scribbles */
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static void
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resize_cb (GtkWidget *widget,
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int width,
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int height,
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gpointer data)
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{
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if (surface)
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{
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cairo_surface_destroy (surface);
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surface = NULL;
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}
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if (gtk_native_get_surface (gtk_widget_get_native (widget)))
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{
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surface = gdk_surface_create_similar_surface (gtk_native_get_surface (gtk_widget_get_native (widget)),
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CAIRO_CONTENT_COLOR,
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gtk_widget_get_width (widget),
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gtk_widget_get_height (widget));
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/* Initialize the surface to white */
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clear_surface ();
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}
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}
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/* Redraw the screen from the surface. Note that the draw
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* callback receives a ready-to-be-used cairo_t that is already
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* clipped to only draw the exposed areas of the widget
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*/
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static void
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draw_cb (GtkDrawingArea *drawing_area,
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cairo_t *cr,
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int width,
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int height,
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gpointer data)
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{
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint (cr);
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}
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/* Draw a rectangle on the surface at the given position */
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static void
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draw_brush (GtkWidget *widget,
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double x,
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double y)
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{
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cairo_t *cr;
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/* Paint to the surface, where we store our state */
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cr = cairo_create (surface);
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cairo_rectangle (cr, x - 3, y - 3, 6, 6);
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cairo_fill (cr);
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cairo_destroy (cr);
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/* Now invalidate the drawing area. */
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gtk_widget_queue_draw (widget);
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}
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static double start_x;
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static double start_y;
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static void
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drag_begin (GtkGestureDrag *gesture,
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double x,
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double y,
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GtkWidget *area)
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{
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start_x = x;
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start_y = y;
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draw_brush (area, x, y);
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}
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static void
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drag_update (GtkGestureDrag *gesture,
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double x,
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double y,
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GtkWidget *area)
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{
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draw_brush (area, start_x + x, start_y + y);
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}
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static void
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drag_end (GtkGestureDrag *gesture,
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double x,
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double y,
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GtkWidget *area)
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{
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draw_brush (area, start_x + x, start_y + y);
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}
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static void
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pressed (GtkGestureClick *gesture,
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int n_press,
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double x,
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double y,
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GtkWidget *area)
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{
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clear_surface ();
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gtk_widget_queue_draw (area);
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}
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static void
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close_window (void)
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{
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if (surface)
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cairo_surface_destroy (surface);
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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GtkWidget *window;
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GtkWidget *grid;
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GtkWidget *button;
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GtkWidget *frame;
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GtkWidget *drawing_area;
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GtkGesture *drag;
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GtkGesture *press;
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window = gtk_application_window_new (app);
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gtk_window_set_title (GTK_WINDOW (window), "Window");
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gtk_window_set_title (GTK_WINDOW (window), "Drawing Area");
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grid = gtk_grid_new ();
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gtk_window_set_child (GTK_WINDOW (window), grid);
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g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
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button = gtk_button_new_with_label (" I ");
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g_signal_connect (button, "clicked", G_CALLBACK (print), "I'm n°1\n");
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gtk_grid_attach (GTK_GRID (grid), button, 0, 0, 1, 1);
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frame = gtk_frame_new (NULL);
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gtk_window_set_child (GTK_WINDOW (window), frame);
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button = gtk_button_new_with_label (" II ");
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g_signal_connect (button, "clicked", G_CALLBACK (print), "I'm n°2\n");
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gtk_grid_attach (GTK_GRID (grid), button, 1, 0, 1, 1);
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drawing_area = gtk_drawing_area_new ();
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/* set a minimum size */
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gtk_widget_set_size_request (drawing_area, 100, 100);
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button = gtk_button_new_with_label ("Quit");
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g_signal_connect (button, "clicked", G_CALLBACK (print), "bye !...\n");
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g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_window_destroy), window);
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gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 2, 1);
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gtk_frame_set_child (GTK_FRAME (frame), drawing_area);
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gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (drawing_area), draw_cb, NULL, NULL);
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g_signal_connect_after (drawing_area, "resize", G_CALLBACK (resize_cb), NULL);
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drag = gtk_gesture_drag_new ();
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (drag), GDK_BUTTON_PRIMARY);
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gtk_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (drag));
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g_signal_connect (drag, "drag-begin", G_CALLBACK (drag_begin), drawing_area);
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g_signal_connect (drag, "drag-update", G_CALLBACK (drag_update), drawing_area);
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g_signal_connect (drag, "drag-end", G_CALLBACK (drag_end), drawing_area);
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press = gtk_gesture_click_new ();
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (press), GDK_BUTTON_SECONDARY);
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gtk_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (press));
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g_signal_connect (press, "pressed", G_CALLBACK (pressed), drawing_area);
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gtk_window_present (GTK_WINDOW (window));
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}
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@ -58,3 +205,4 @@ main (int argc,
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return status;
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}
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