forked from AuroraMiddleware/gtk
249 lines
6.2 KiB
C
249 lines
6.2 KiB
C
|
/* Transparent
|
||
|
*
|
||
|
* Use transparent background on GdkWindows to create a shadow effect on a GtkOverlay widget.
|
||
|
*/
|
||
|
|
||
|
#include <gtk/gtk.h>
|
||
|
|
||
|
#define SHADOW_OFFSET_X 7
|
||
|
#define SHADOW_OFFSET_Y 7
|
||
|
#define SHADOW_RADIUS 5
|
||
|
|
||
|
static void
|
||
|
draw_shadow_box (cairo_t *cr,
|
||
|
GdkRectangle rect,
|
||
|
double radius,
|
||
|
double transparency)
|
||
|
{
|
||
|
cairo_pattern_t *pattern;
|
||
|
double x0, x1, x2, x3;
|
||
|
double y0, y1, y2, y3;
|
||
|
|
||
|
x0 = rect.x;
|
||
|
x1 = rect.x + radius;
|
||
|
x2 = rect.x + rect.width - radius;
|
||
|
x3 = rect.x + rect.width;
|
||
|
|
||
|
y0 = rect.y;
|
||
|
y1 = rect.y + radius;
|
||
|
y2 = rect.y + rect.height - radius;
|
||
|
y3 = rect.y + rect.height;
|
||
|
|
||
|
/* Fill non-border part */
|
||
|
cairo_set_source_rgba (cr, 0, 0, 0, transparency);
|
||
|
cairo_rectangle (cr,
|
||
|
x1, y1, x2 - x1, y2 - y1);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* Upper border */
|
||
|
|
||
|
pattern = cairo_pattern_create_linear (0, y0, 0, y1);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, 0.0);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, transparency);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x1, y0,
|
||
|
x2 - x1, y1 - y0);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* Bottom border */
|
||
|
|
||
|
pattern = cairo_pattern_create_linear (0, y2, 0, y3);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x1, y2,
|
||
|
x2 - x1, y3 - y2);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* Left border */
|
||
|
|
||
|
pattern = cairo_pattern_create_linear (x0, 0, x1, 0);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, 0.0);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, transparency);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x0, y1,
|
||
|
x1 - x0, y2 - y1);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* Right border */
|
||
|
|
||
|
pattern = cairo_pattern_create_linear (x2, 0, x3, 0);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x2, y1,
|
||
|
x3 - x2, y2 - y1);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* NW corner */
|
||
|
|
||
|
pattern = cairo_pattern_create_radial (x1, y1, 0,
|
||
|
x1, y1, radius);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x0, y0,
|
||
|
x1 - x0, y1 - y0);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* NE corner */
|
||
|
|
||
|
pattern = cairo_pattern_create_radial (x2, y1, 0,
|
||
|
x2, y1, radius);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x2, y0,
|
||
|
x3 - x2, y1 - y0);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* SW corner */
|
||
|
|
||
|
pattern = cairo_pattern_create_radial (x1, y2, 0,
|
||
|
x1, y2, radius);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x0, y2,
|
||
|
x1 - x0, y3 - y2);
|
||
|
cairo_fill (cr);
|
||
|
|
||
|
/* SE corner */
|
||
|
|
||
|
pattern = cairo_pattern_create_radial (x2, y2, 0,
|
||
|
x2, y2, radius);
|
||
|
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0, 0, transparency);
|
||
|
cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0, 0, 0.0);
|
||
|
|
||
|
cairo_set_source (cr, pattern);
|
||
|
cairo_pattern_destroy (pattern);
|
||
|
|
||
|
cairo_rectangle (cr,
|
||
|
x2, y2,
|
||
|
x3 - x2, y3 - y2);
|
||
|
cairo_fill (cr);
|
||
|
}
|
||
|
|
||
|
static gboolean
|
||
|
draw_callback (GtkWidget *widget,
|
||
|
cairo_t *cr,
|
||
|
gpointer data)
|
||
|
{
|
||
|
GdkRectangle rect;
|
||
|
|
||
|
gtk_widget_get_allocation (widget, &rect);
|
||
|
rect.x += SHADOW_OFFSET_X;
|
||
|
rect.y += SHADOW_OFFSET_Y;
|
||
|
rect.width -= SHADOW_OFFSET_X;
|
||
|
rect.height -= SHADOW_OFFSET_Y;
|
||
|
|
||
|
draw_shadow_box (cr,
|
||
|
rect, SHADOW_RADIUS, 0.4);
|
||
|
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
GtkWidget *
|
||
|
do_transparent (GtkWidget *do_widget)
|
||
|
{
|
||
|
static GtkWidget *window = NULL;
|
||
|
|
||
|
if (!window)
|
||
|
{
|
||
|
GtkWidget *view;
|
||
|
GtkWidget *sw;
|
||
|
GtkWidget *overlay;
|
||
|
GtkWidget *align;
|
||
|
GtkWidget *entry;
|
||
|
GdkRGBA transparent = {0.1, 0, 0, 0};
|
||
|
|
||
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
||
|
gtk_window_set_screen (GTK_WINDOW (window),
|
||
|
gtk_widget_get_screen (do_widget));
|
||
|
gtk_window_set_default_size (GTK_WINDOW (window),
|
||
|
450, 450);
|
||
|
|
||
|
g_signal_connect (window, "destroy",
|
||
|
G_CALLBACK (gtk_widget_destroyed), &window);
|
||
|
|
||
|
gtk_window_set_title (GTK_WINDOW (window), "Transparent");
|
||
|
gtk_container_set_border_width (GTK_CONTAINER (window), 0);
|
||
|
|
||
|
view = gtk_text_view_new ();
|
||
|
|
||
|
sw = gtk_scrolled_window_new (NULL, NULL);
|
||
|
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
|
||
|
GTK_POLICY_AUTOMATIC,
|
||
|
GTK_POLICY_AUTOMATIC);
|
||
|
gtk_container_add (GTK_CONTAINER (sw), view);
|
||
|
|
||
|
overlay = gtk_overlay_new ();
|
||
|
gtk_container_add (GTK_CONTAINER (overlay), sw);
|
||
|
gtk_container_add (GTK_CONTAINER (window), overlay);
|
||
|
|
||
|
gtk_widget_override_background_color (overlay, 0, &transparent);
|
||
|
|
||
|
align = gtk_alignment_new (0.0, 0.0, 0.0, 0.0);
|
||
|
gtk_alignment_set_padding (GTK_ALIGNMENT (align),
|
||
|
0, SHADOW_OFFSET_Y, 0, SHADOW_OFFSET_X);
|
||
|
g_signal_connect (align, "draw", G_CALLBACK (draw_callback), NULL);
|
||
|
|
||
|
entry = gtk_entry_new ();
|
||
|
gtk_container_add (GTK_CONTAINER (align), entry);
|
||
|
|
||
|
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), align);
|
||
|
gtk_widget_set_halign (align, GTK_ALIGN_CENTER);
|
||
|
gtk_widget_set_valign (align, GTK_ALIGN_START);
|
||
|
|
||
|
gtk_widget_show_all (overlay);
|
||
|
}
|
||
|
|
||
|
if (!gtk_widget_get_visible (window))
|
||
|
{
|
||
|
gtk_widget_show (window);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
gtk_widget_destroy (window);
|
||
|
window = NULL;
|
||
|
}
|
||
|
|
||
|
return window;
|
||
|
}
|