diff options
Diffstat (limited to 'gtkpopover/main.c')
| -rw-r--r-- | gtkpopover/main.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/gtkpopover/main.c b/gtkpopover/main.c new file mode 100644 index 0000000..2e2ea30 --- /dev/null +++ b/gtkpopover/main.c @@ -0,0 +1,193 @@ +// 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; +} |