Started the replacement GTK+ Popover.
This commit is contained in:
Pietro Gagliardi
parent
64274907d3
commit
63d59e7421
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// 10 october 2014
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// #qo pkg-config: gtk+-3.0
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#include <gtk/gtk.h>
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typedef gint LONG;
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typedef struct POINT POINT;
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struct POINT {
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LONG x;
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LONG y;
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};
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struct popover {
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void *gopopover;
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// 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!
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LONG arrowLeft;
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LONG arrowRight;
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LONG arrowTop;
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LONG arrowBottom;
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};
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struct popover _p = { NULL, -1, -1, 20, -1 };
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struct popover *p = &_p;
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#define ARROWHEIGHT 8
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#define ARROWWIDTH 8 /* should be the same for smooth lines */
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void makePopoverPath(cairo_t *cr, LONG width, LONG height)
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{
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POINT pt[20];
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int n;
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LONG xmax, ymax;
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cairo_new_path(cr);
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n = 0;
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// figure out the xmax and ymax of the box
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xmax = width;
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if (p->arrowRight >= 0)
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xmax -= ARROWWIDTH;
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ymax = height;
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if (p->arrowBottom >= 0)
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ymax -= ARROWHEIGHT;
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// the first point is either at (0,0), (0,arrowHeight), (arrowWidth,0), or (arrowWidth,arrowHeight)
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pt[n].x = 0;
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if (p->arrowLeft >= 0)
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pt[n].x = ARROWWIDTH;
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pt[n].y = 0;
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if (p->arrowTop >= 0)
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pt[n].y = ARROWHEIGHT;
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n++;
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// the left side
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pt[n].x = pt[n - 1].x;
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if (p->arrowLeft >= 0) {
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pt[n].y = pt[n - 1].y + p->arrowLeft;
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n++;
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pt[n].x = pt[n - 1].x - ARROWWIDTH;
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pt[n].y = pt[n - 1].y + ARROWHEIGHT;
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n++;
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pt[n].x = pt[n - 1].x + ARROWWIDTH;
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pt[n].y = pt[n - 1].y + ARROWHEIGHT;
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n++;
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pt[n].x = pt[n - 1].x;
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}
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pt[n].y = ymax;
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n++;
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// the bottom side
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pt[n].y = pt[n - 1].y;
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if (p->arrowBottom >= 0) {
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pt[n].x = pt[n - 1].x + p->arrowBottom;
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n++;
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pt[n].x = pt[n - 1].x + ARROWWIDTH;
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pt[n].y = pt[n - 1].y + ARROWHEIGHT;
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n++;
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pt[n].x = pt[n - 1].x + ARROWWIDTH;
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pt[n].y = pt[n - 1].y - ARROWHEIGHT;
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n++;
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pt[n].y = pt[n - 1].y;
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}
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pt[n].x = xmax;
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n++;
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// the right side
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pt[n].x = pt[n - 1].x;
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if (p->arrowRight >= 0) {
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pt[n].y = pt[0].y + p->arrowRight + (ARROWHEIGHT * 2);
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n++;
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pt[n].x = pt[n - 1].x + ARROWWIDTH;
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pt[n].y = pt[n - 1].y - ARROWHEIGHT;
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n++;
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pt[n].x = pt[n - 1].x - ARROWWIDTH;
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pt[n].y = pt[n - 1].y - ARROWHEIGHT;
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n++;
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pt[n].x = pt[n - 1].x;
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}
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pt[n].y = pt[0].y;
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n++;
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// the top side
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pt[n].y = pt[n - 1].y;
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if (p->arrowTop >= 0) {
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pt[n].x = pt[0].x + p->arrowTop + (ARROWWIDTH * 2);
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n++;
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pt[n].x = pt[n - 1].x - ARROWWIDTH;
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pt[n].y = pt[n - 1].y - ARROWHEIGHT;
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n++;
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pt[n].x = pt[n - 1].x - ARROWWIDTH;
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pt[n].y = pt[n - 1].y + ARROWHEIGHT;
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n++;
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pt[n].y = pt[n - 1].y;
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}
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pt[n].x = pt[0].x;
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n++;
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int i;
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// TODO bypass subpixel rendering
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cairo_move_to(cr, pt[0].x, pt[0].y);
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for (i = 1; i < n; i++)
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cairo_line_to(cr, pt[i].x, pt[i].y);
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}
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void drawPopoverFrame(GtkWidget *widget, cairo_t *cr, LONG width, LONG height, int forceAlpha)
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{
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GtkStyleContext *context;
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GdkRGBA background, border;
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// TODO see what GtkPopover itself does
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// TODO drop shadow
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context = gtk_widget_get_style_context(widget);
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gtk_style_context_get_background_color(context, GTK_STATE_FLAG_NORMAL, &background);
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gtk_style_context_get_border_color(context, GTK_STATE_FLAG_NORMAL, &border);
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if (forceAlpha) {
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background.alpha = 1;
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border.alpha = 1;
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}
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makePopoverPath(cr, width, height);
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cairo_set_source_rgba(cr, background.red, background.green, background.blue, background.alpha);
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cairo_fill_preserve(cr);
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cairo_set_source_rgba(cr, border.red, border.green, border.blue, border.alpha);
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cairo_stroke(cr);
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}
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gboolean popoverDraw(GtkWidget *widget, cairo_t *cr, gpointer data)
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{
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gint width, height;
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width = gtk_widget_get_allocated_width(widget);
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height = gtk_widget_get_allocated_height(widget);
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drawPopoverFrame(widget, cr, width, height, 0);
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return FALSE;
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}
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void popoverSetSize(GtkWidget *widget, LONG width, LONG height)
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{
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GdkWindow *gdkwin;
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cairo_t *cr;
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cairo_surface_t *cs;
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cairo_region_t *region;
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gtk_window_resize(GTK_WINDOW(widget), width, height);
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gdkwin = gtk_widget_get_window(widget);
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gdk_window_shape_combine_region(gdkwin, NULL, 0, 0);
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// TODO check errors
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cs = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
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cr = cairo_create(cs);
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drawPopoverFrame(widget, cr, width, height, 1);
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region = gdk_cairo_region_create_from_surface(cs);
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gdk_window_shape_combine_region(gdkwin, region, 0, 0);
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cairo_destroy(cr);
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cairo_surface_destroy(cs);
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}
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int main(void)
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{
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GtkWidget *w;
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gtk_init(NULL, NULL);
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w = gtk_window_new(GTK_WINDOW_POPUP);
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gtk_window_set_decorated(GTK_WINDOW(w), FALSE);
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gtk_widget_set_app_paintable(w, TRUE);
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g_signal_connect(w, "draw", G_CALLBACK(popoverDraw), NULL);
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gtk_widget_realize(w);
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popoverSetSize(w, 200, 200);
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gtk_widget_show_all(w);
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gtk_main();
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return 0;
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}
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