[gtk+/wip/baedert/drawing: 249/262] testwidgetfocus: Drop SPACING constant in favor for CSS

[Timm Bäder <baedert src gnome org>]

commit 6e6f5d0e50aa371bfdceb42804ed426a82c6bebc
Author: Timm Bäder <mail baedert org>
Date:   Fri Jun 2 22:08:22 2017 +0200

    testwidgetfocus: Drop SPACING constant in favor for CSS
    
    This makes it easier to test various other properties of widgets.

 tests/testwidgetfocus.c |  136 +++++++++++++++++++++++++++++++++++++++++++----
 1 files changed, 125 insertions(+), 11 deletions(-)
---
diff --git a/tests/testwidgetfocus.c b/tests/testwidgetfocus.c
index e63deb3..780f652 100644
--- a/tests/testwidgetfocus.c
+++ b/tests/testwidgetfocus.c
@@ -12,11 +12,55 @@ typedef struct _GtkFocusWidgetClass GtkFocusWidgetClass;
 #define GTK_IS_FOCUS_WIDGET_CLASS(cls)   (G_TYPE_CHECK_CLASS_TYPE(cls, GTK_TYPE_FOCUS_WIDGET))
 #define GTK_FOCUS_WIDGET_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS(obj, GTK_TYPE_FOCUS_WIDGET, 
GtkFocusWidgetClass))
 
-#define SPACING 30
+const char *css =
+"* {"
+"  transition: none; "
+"}"
+"focuswidget {"
+"  padding: 30px;"
+"  font-size: 70%;"
+"}"
+"focuswidget button:nth-child(1) {"
+"  margin-right: 15px;"
+"  margin-bottom: 15px;"
+"}"
+"focuswidget button:nth-child(2) {"
+"  margin-left: 15px;"
+"  margin-bottom: 15px;"
+"}"
+"focuswidget button:nth-child(3) {"
+"  margin-right: 15px;"
+"  margin-top: 15px;"
+"}"
+"focuswidget button:nth-child(4) {"
+"  margin-left: 15px;"
+"  margin-top: 15px;"
+"}"
+"focuswidget button {"
+"  min-width: 80px;"
+"  min-height: 80px;"
+"  margin: 0px;"
+"  border: 5px solid green;"
+"  border-radius: 0px;"
+"  padding: 10px;"
+"  background-image: none;"
+"  background-color: white;"
+"  box-shadow: none;"
+"}"
+"focuswidget button:hover {"
+"  background-color: black;"
+"  color: white;"
+"}"
+"focuswidget button label:hover {"
+"  background-color: green;"
+"}"
+;
 
 struct _GtkFocusWidget
 {
   GtkWidget parent_instance;
+  int mouse_x;
+  int mouse_y;
 
   union {
     struct {
@@ -43,26 +87,26 @@ static void
 gtk_focus_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
 {
   GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
-  int child_width  = (allocation->width  - (3 * SPACING)) / 2;
-  int child_height = (allocation->height - (3 * SPACING)) / 2;
+  int child_width  = (allocation->width)  / 2;
+  int child_height = (allocation->height) / 2;
   GtkAllocation child_alloc;
 
-  child_alloc.x = SPACING + allocation->x;
-  child_alloc.y = SPACING + allocation->y;
+  child_alloc.x = 0;
+  child_alloc.y = 0;
   child_alloc.width = child_width;
   child_alloc.height = child_height;
 
   gtk_widget_size_allocate (self->child1, &child_alloc);
 
-  child_alloc.x += SPACING + child_width;
+  child_alloc.x += child_width;
 
   gtk_widget_size_allocate (self->child2, &child_alloc);
 
-  child_alloc.y += SPACING + child_height;
+  child_alloc.y += child_height;
 
   gtk_widget_size_allocate (self->child4, &child_alloc);
 
-  child_alloc.x -= SPACING + child_width;
+  child_alloc.x -= child_width;
 
   gtk_widget_size_allocate (self->child3, &child_alloc);
 }
@@ -94,9 +138,6 @@ gtk_focus_widget_measure (GtkWidget      *widget,
 
   *minimum *= 2;
   *natural *= 2;
-
-  *minimum += SPACING * 3;
-  *natural += SPACING * 3;
 }
 
 static void
@@ -108,6 +149,64 @@ gtk_focus_widget_snapshot (GtkWidget *widget, GtkSnapshot *snapshot)
   gtk_widget_snapshot_child (widget, self->child2, snapshot);
   gtk_widget_snapshot_child (widget, self->child3, snapshot);
   gtk_widget_snapshot_child (widget, self->child4, snapshot);
+
+  if (self->mouse_x != G_MININT && self->mouse_y != G_MININT)
+    {
+      PangoLayout *layout;
+      char *text;
+      GtkAllocation alloc;
+      graphene_rect_t bounds;
+      GdkRGBA black = {0, 0, 0, 1};
+
+      gtk_widget_get_allocation (widget, &alloc);
+
+      /* Since event coordinates and drawing is supposed to happen in the
+       * same coodinates space, this should all work out just fine. */
+      bounds.origin.x = self->mouse_x;
+      bounds.origin.y = -30;
+      bounds.size.width = 1;
+      bounds.size.height = alloc.height;
+      gtk_snapshot_append_color (snapshot,
+                                 &black,
+                                 &bounds,
+                                 "Crosshair 1");
+
+      bounds.origin.x = -30;
+      bounds.origin.y = self->mouse_y;
+      bounds.size.width = alloc.width;
+      bounds.size.height = 1;
+      gtk_snapshot_append_color (snapshot,
+                                 &black,
+                                 &bounds,
+                                 "Crosshair 2");
+
+      layout = gtk_widget_create_pango_layout (widget, NULL);
+      text = g_strdup_printf ("%d×%d", self->mouse_x, self->mouse_y);
+      pango_layout_set_text (layout, text, -1);
+
+      gtk_snapshot_render_layout (snapshot,
+                                  gtk_widget_get_style_context (widget),
+                                  self->mouse_x + 2,
+                                  self->mouse_y - 15, /* *shrug* */
+                                  layout);
+
+      g_free (text);
+      g_object_unref (layout);
+    }
+}
+
+static gboolean
+gtk_focus_widget_motion_notify_event (GtkWidget *widget,
+                                      GdkEventMotion *event)
+{
+  GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
+
+  self->mouse_x = event->x;
+  self->mouse_y = event->y;
+
+  gtk_widget_queue_draw (widget);
+
+  return GDK_EVENT_PROPAGATE;
 }
 
 static void
@@ -136,6 +235,9 @@ gtk_focus_widget_init (GtkFocusWidget *self)
   gtk_widget_set_parent (self->child3, GTK_WIDGET (self));
   self->child4 = gtk_button_new_with_label ("4");
   gtk_widget_set_parent (self->child4, GTK_WIDGET (self));
+
+  self->mouse_x = G_MININT;
+  self->mouse_y = G_MININT;
 }
 
 static void
@@ -149,6 +251,9 @@ gtk_focus_widget_class_init (GtkFocusWidgetClass *klass)
   widget_class->snapshot = gtk_focus_widget_snapshot;
   widget_class->measure = gtk_focus_widget_measure;
   widget_class->size_allocate = gtk_focus_widget_size_allocate;
+  widget_class->motion_notify_event = gtk_focus_widget_motion_notify_event;
+
+  gtk_widget_class_set_css_name (widget_class, "focuswidget");
 }
 
 int
@@ -156,12 +261,21 @@ main()
 {
   GtkWidget *window;
   GtkWidget *widget;
+  GtkCssProvider *provider;
+
   gtk_init ();
 
+  provider = gtk_css_provider_new ();
+  gtk_css_provider_load_from_data (provider, css, -1);
+  gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
+                                             GTK_STYLE_PROVIDER (provider),
+                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
 
   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   widget = g_object_new (GTK_TYPE_FOCUS_WIDGET, NULL);
 
+  gtk_window_set_decorated (GTK_WINDOW (window), FALSE);
+
   gtk_container_add (GTK_CONTAINER (window), widget);
   g_signal_connect (window, "delete-event", G_CALLBACK (gtk_main_quit), NULL);