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// 10 october 2014
// #qo pkg-config: gtk+-3.0
#include <gtk/gtk.h>
typedef gint LONG;
typedef struct POINT POINT;
struct POINT {
LONG x;
LONG y;
};
struct popover {
void *gopopover;
// a nice consequence of this design is that it allows four arrowheads to jut out at once; in practice only one will ever be used, but hey — simple implementation!
LONG arrowLeft;
LONG arrowRight;
LONG arrowTop;
LONG arrowBottom;
};
struct popover _p = { NULL, -1, -1, 20, -1 };
struct popover *p = &_p;
#define ARROWHEIGHT 8
#define ARROWWIDTH 8 /* should be the same for smooth lines */
void makePopoverPath(cairo_t *cr, LONG width, LONG height)
{
POINT pt[20];
int n;
LONG xmax, ymax;
cairo_new_path(cr);
n = 0;
// figure out the xmax and ymax of the box
xmax = width;
if (p->arrowRight >= 0)
xmax -= ARROWWIDTH;
ymax = height;
if (p->arrowBottom >= 0)
ymax -= ARROWHEIGHT;
// the first point is either at (0,0), (0,arrowHeight), (arrowWidth,0), or (arrowWidth,arrowHeight)
pt[n].x = 0;
if (p->arrowLeft >= 0)
pt[n].x = ARROWWIDTH;
pt[n].y = 0;
if (p->arrowTop >= 0)
pt[n].y = ARROWHEIGHT;
n++;
// the left side
pt[n].x = pt[n - 1].x;
if (p->arrowLeft >= 0) {
pt[n].y = pt[n - 1].y + p->arrowLeft;
n++;
pt[n].x = pt[n - 1].x - ARROWWIDTH;
pt[n].y = pt[n - 1].y + ARROWHEIGHT;
n++;
pt[n].x = pt[n - 1].x + ARROWWIDTH;
pt[n].y = pt[n - 1].y + ARROWHEIGHT;
n++;
pt[n].x = pt[n - 1].x;
}
pt[n].y = ymax;
n++;
// the bottom side
pt[n].y = pt[n - 1].y;
if (p->arrowBottom >= 0) {
pt[n].x = pt[n - 1].x + p->arrowBottom;
n++;
pt[n].x = pt[n - 1].x + ARROWWIDTH;
pt[n].y = pt[n - 1].y + ARROWHEIGHT;
n++;
pt[n].x = pt[n - 1].x + ARROWWIDTH;
pt[n].y = pt[n - 1].y - ARROWHEIGHT;
n++;
pt[n].y = pt[n - 1].y;
}
pt[n].x = xmax;
n++;
// the right side
pt[n].x = pt[n - 1].x;
if (p->arrowRight >= 0) {
pt[n].y = pt[0].y + p->arrowRight + (ARROWHEIGHT * 2);
n++;
pt[n].x = pt[n - 1].x + ARROWWIDTH;
pt[n].y = pt[n - 1].y - ARROWHEIGHT;
n++;
pt[n].x = pt[n - 1].x - ARROWWIDTH;
pt[n].y = pt[n - 1].y - ARROWHEIGHT;
n++;
pt[n].x = pt[n - 1].x;
}
pt[n].y = pt[0].y;
n++;
// the top side
pt[n].y = pt[n - 1].y;
if (p->arrowTop >= 0) {
pt[n].x = pt[0].x + p->arrowTop + (ARROWWIDTH * 2);
n++;
pt[n].x = pt[n - 1].x - ARROWWIDTH;
pt[n].y = pt[n - 1].y - ARROWHEIGHT;
n++;
pt[n].x = pt[n - 1].x - ARROWWIDTH;
pt[n].y = pt[n - 1].y + ARROWHEIGHT;
n++;
pt[n].y = pt[n - 1].y;
}
pt[n].x = pt[0].x;
n++;
int i;
// TODO bypass subpixel rendering
cairo_move_to(cr, pt[0].x, pt[0].y);
for (i = 1; i < n; i++)
cairo_line_to(cr, pt[i].x, pt[i].y);
}
void drawPopoverFrame(GtkWidget *widget, cairo_t *cr, LONG width, LONG height, int forceAlpha)
{
GtkStyleContext *context;
GdkRGBA background, border;
// TODO see what GtkPopover itself does
// TODO drop shadow
context = gtk_widget_get_style_context(widget);
gtk_style_context_get_background_color(context, GTK_STATE_FLAG_NORMAL, &background);
gtk_style_context_get_border_color(context, GTK_STATE_FLAG_NORMAL, &border);
if (forceAlpha) {
background.alpha = 1;
border.alpha = 1;
}
makePopoverPath(cr, width, height);
cairo_set_source_rgba(cr, background.red, background.green, background.blue, background.alpha);
cairo_fill_preserve(cr);
cairo_set_source_rgba(cr, border.red, border.green, border.blue, border.alpha);
cairo_stroke(cr);
}
gboolean popoverDraw(GtkWidget *widget, cairo_t *cr, gpointer data)
{
gint width, height;
width = gtk_widget_get_allocated_width(widget);
height = gtk_widget_get_allocated_height(widget);
drawPopoverFrame(widget, cr, width, height, 0);
return FALSE;
}
void popoverSetSize(GtkWidget *widget, LONG width, LONG height)
{
GdkWindow *gdkwin;
cairo_t *cr;
cairo_surface_t *cs;
cairo_region_t *region;
gtk_window_resize(GTK_WINDOW(widget), width, height);
gdkwin = gtk_widget_get_window(widget);
gdk_window_shape_combine_region(gdkwin, NULL, 0, 0);
// TODO check errors
cs = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cr = cairo_create(cs);
drawPopoverFrame(widget, cr, width, height, 1);
region = gdk_cairo_region_create_from_surface(cs);
gdk_window_shape_combine_region(gdkwin, region, 0, 0);
cairo_destroy(cr);
cairo_surface_destroy(cs);
}
int main(void)
{
GtkWidget *w;
gtk_init(NULL, NULL);
w = gtk_window_new(GTK_WINDOW_POPUP);
gtk_window_set_decorated(GTK_WINDOW(w), FALSE);
gtk_widget_set_app_paintable(w, TRUE);
g_signal_connect(w, "draw", G_CALLBACK(popoverDraw), NULL);
gtk_widget_realize(w);
popoverSetSize(w, 200, 200);
gtk_widget_show_all(w);
gtk_main();
return 0;
}
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