Make button size themeable indirectly through font settings

1 files changed, 43 insertions, 10 deletions

diff --git a/rcm-client-receive.c b/rcm-client-receive.c
index 710c8c4..3dd7f20 100644
--- a/rcm-client-receive.c
+++ b/rcm-client-receive.c
@@ -69,10 +69,42 @@ button_press_event_cb(GtkButton *button, gpointer user_data)
 	}
 }
 
-#define REMOTE_BUTTON_WIDTH 64
-#define REMOTE_BUTTON_HEIGHT 64
-#define REMOTE_BUTTON_PADDING 2
+/* Hacky McHack - Estimate the size needed for a button with ABCDEF */
+static int
+calculate_img_size(GtkWidget *button)
+{
+	static bool first = true;
+	static int size;
+	cairo_surface_t *surface;
+	cairo_t *ct;
+	PangoLayout *layout;
+	PangoFontDescription *font_description;
 
+	if (!first)
+		return size;
+
+	surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
+	ct = cairo_create(surface);
+	layout = pango_cairo_create_layout(ct);
+
+	gtk_style_context_get(gtk_widget_get_style_context(button),
+			      gtk_widget_get_state_flags(button),
+			      GTK_STYLE_PROPERTY_FONT, &font_description,
+			      NULL);
+
+	pango_layout_set_font_description(layout, font_description);
+	pango_font_description_free(font_description);
+	pango_layout_set_text(layout, "ABCDEF", -1);
+	pango_layout_get_pixel_size(layout, &size, NULL);
+	g_object_unref(layout);
+	cairo_destroy(ct);
+	cairo_surface_destroy(surface);
+
+	first = false;
+	return size;
+}
+
+#define REMOTE_BUTTON_PADDING 2.0f
 static void
 create_button_img(GtkWidget *button, const char *keycode)
 {
@@ -88,7 +120,8 @@ create_button_img(GtkWidget *button, const char *keycode)
 	double scale = 1.0;
 	GdkRGBA *color;
 	gint pw, ph;
-
+	int img_size;
+     
 	for (lik = &linux_input_keycodes[0]; lik->name; lik++)
 		if (keycode && !strcmp(lik->name, keycode))
 			break;
@@ -101,9 +134,9 @@ create_button_img(GtkWidget *button, const char *keycode)
 	if (lik->cs)
 		goto out;
 
+	img_size = calculate_img_size(button);
 	surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
-					     REMOTE_BUTTON_WIDTH,
-					     REMOTE_BUTTON_HEIGHT);
+					     img_size, img_size);
 	ct = cairo_create(surface);
 	layout = pango_cairo_create_layout(ct);
 
@@ -123,12 +156,12 @@ create_button_img(GtkWidget *button, const char *keycode)
 
 	pango_layout_get_pixel_size(layout, &pw, &ph);
 
-	scale_x = ((float)REMOTE_BUTTON_WIDTH  - (float)REMOTE_BUTTON_PADDING * 2.0f) / (float)pw;
-	scale_y = ((float)REMOTE_BUTTON_HEIGHT - (float)REMOTE_BUTTON_PADDING * 2.0f) / (float)ph;
+	scale_x = ((float)img_size  - REMOTE_BUTTON_PADDING * 2.0f) / (float)pw;
+	scale_y = ((float)img_size - REMOTE_BUTTON_PADDING * 2.0f) / (float)ph;
 	scale = scale_x < scale ? scale_x : scale;
 	scale = scale_y < scale ? scale_y : scale;
-	x = (float)REMOTE_BUTTON_WIDTH  / 2.0f - ((float)pw / 2.0f) * scale;
-	y = (float)REMOTE_BUTTON_HEIGHT / 2.0f - ((float)ph / 2.0f) * scale;
+	x = (float)img_size  / 2.0f - ((float)pw / 2.0f) * scale;
+	y = (float)img_size / 2.0f - ((float)ph / 2.0f) * scale;
 	cairo_move_to(ct, x, y);
 	cairo_scale(ct, scale, scale);
 	pango_cairo_show_layout(ct, layout);