mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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609e04ddcf
Clean up the code of many examples in minor ways, fix some memory leaks, and avoid the use of dialogs where a regular toplevel works just as well.
243 lines
6.6 KiB
C
243 lines
6.6 KiB
C
/* Transparency
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*
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* Use transparent background on GdkWindows to create a shadow effect on a GtkOverlay widget.
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*/
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#include <gtk/gtk.h>
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#define SHADOW_OFFSET_X 7
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#define SHADOW_OFFSET_Y 7
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#define SHADOW_RADIUS 5
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static void
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draw_shadow_box (cairo_t *cr,
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GdkRectangle rect,
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double radius,
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double transparency)
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{
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cairo_pattern_t *pattern;
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double x0, x1, x2, x3;
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double y0, y1, y2, y3;
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x0 = rect.x;
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x1 = rect.x + radius;
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x2 = rect.x + rect.width - radius;
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x3 = rect.x + rect.width;
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y0 = rect.y;
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y1 = rect.y + radius;
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y2 = rect.y + rect.height - radius;
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y3 = rect.y + rect.height;
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/* Fill non-border part */
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cairo_set_source_rgba (cr, 0, 0, 0, transparency);
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cairo_rectangle (cr,
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x1, y1, x2 - x1, y2 - y1);
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cairo_fill (cr);
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/* Upper border */
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pattern = cairo_pattern_create_linear (0, y0, 0, y1);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, 0.0);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, transparency);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x1, y0,
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x2 - x1, y1 - y0);
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cairo_fill (cr);
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/* Bottom border */
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pattern = cairo_pattern_create_linear (0, y2, 0, y3);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x1, y2,
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x2 - x1, y3 - y2);
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cairo_fill (cr);
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/* Left border */
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pattern = cairo_pattern_create_linear (x0, 0, x1, 0);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, 0.0);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, transparency);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x0, y1,
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x1 - x0, y2 - y1);
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cairo_fill (cr);
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/* Right border */
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pattern = cairo_pattern_create_linear (x2, 0, x3, 0);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x2, y1,
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x3 - x2, y2 - y1);
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cairo_fill (cr);
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/* NW corner */
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pattern = cairo_pattern_create_radial (x1, y1, 0,
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x1, y1, radius);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x0, y0,
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x1 - x0, y1 - y0);
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cairo_fill (cr);
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/* NE corner */
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pattern = cairo_pattern_create_radial (x2, y1, 0,
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x2, y1, radius);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x2, y0,
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x3 - x2, y1 - y0);
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cairo_fill (cr);
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/* SW corner */
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pattern = cairo_pattern_create_radial (x1, y2, 0,
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x1, y2, radius);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x0, y2,
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x1 - x0, y3 - y2);
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cairo_fill (cr);
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/* SE corner */
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pattern = cairo_pattern_create_radial (x2, y2, 0,
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x2, y2, radius);
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cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
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cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_rectangle (cr,
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x2, y2,
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x3 - x2, y3 - y2);
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cairo_fill (cr);
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}
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static gboolean
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draw_callback (GtkWidget *widget,
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cairo_t *cr,
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gpointer data)
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{
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GdkRectangle rect;
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gtk_widget_get_allocation (widget, &rect);
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rect.x += SHADOW_OFFSET_X;
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rect.y += SHADOW_OFFSET_Y;
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rect.width -= SHADOW_OFFSET_X;
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rect.height -= SHADOW_OFFSET_Y;
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draw_shadow_box (cr,
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rect, SHADOW_RADIUS, 0.4);
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return FALSE;
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}
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GtkWidget *
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do_transparent (GtkWidget *do_widget)
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{
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static GtkWidget *window = NULL;
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if (!window)
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{
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GtkWidget *view;
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GtkWidget *sw;
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GtkWidget *overlay;
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GtkWidget *entry;
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GtkCssProvider *provider;
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gchar *css;
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_screen (GTK_WINDOW (window),
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gtk_widget_get_screen (do_widget));
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gtk_window_set_default_size (GTK_WINDOW (window), 450, 450);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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gtk_window_set_title (GTK_WINDOW (window), "Transparency");
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gtk_container_set_border_width (GTK_CONTAINER (window), 0);
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view = gtk_text_view_new ();
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sw = gtk_scrolled_window_new (NULL, NULL);
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
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GTK_POLICY_AUTOMATIC,
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GTK_POLICY_AUTOMATIC);
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gtk_container_add (GTK_CONTAINER (sw), view);
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overlay = gtk_overlay_new ();
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gtk_container_add (GTK_CONTAINER (overlay), sw);
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gtk_container_add (GTK_CONTAINER (window), overlay);
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entry = gtk_entry_new ();
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provider = gtk_css_provider_new ();
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css = g_strdup_printf ("* { border-width: 0px %dpx %dpx 0px; }",
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SHADOW_OFFSET_X, SHADOW_OFFSET_Y);
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gtk_css_provider_load_from_data (provider, css, -1, NULL);
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g_free (css);
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gtk_style_context_add_provider (gtk_widget_get_style_context (entry),
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GTK_STYLE_PROVIDER (provider),
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GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
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g_signal_connect (entry, "draw", G_CALLBACK (draw_callback), NULL);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), entry);
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gtk_widget_set_halign (entry, GTK_ALIGN_CENTER);
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gtk_widget_set_valign (entry, GTK_ALIGN_START);
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gtk_widget_show_all (overlay);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show (window);
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else
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gtk_widget_destroy (window);
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return window;
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}
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