mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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308 lines
8.3 KiB
C
308 lines
8.3 KiB
C
#include <gtk/gtk.h>
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typedef struct _GtkFocusWidget GtkFocusWidget;
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typedef struct _GtkFocusWidgetClass GtkFocusWidgetClass;
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#define GTK_TYPE_FOCUS_WIDGET (gtk_focus_widget_get_type ())
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#define GTK_FOCUS_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GTK_TYPE_FOCUS_WIDGET, GtkFocusWidget))
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#define GTK_FOCUS_WIDGET_CLASS(cls) (G_TYPE_CHECK_CLASS_CAST(cls, GTK_TYPE_FOCUS_WIDGET, GtkFocusWidgetClass))
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#define GTK_IS_FOCUS_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_TYPE(obj, GTK_TYPE_FOCUS_WIDGET))
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#define GTK_IS_FOCUS_WIDGET_CLASS(cls) (G_TYPE_CHECK_CLASS_TYPE(cls, GTK_TYPE_FOCUS_WIDGET))
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#define GTK_FOCUS_WIDGET_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS(obj, GTK_TYPE_FOCUS_WIDGET, GtkFocusWidgetClass))
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const char *css =
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"* {"
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" transition: none; "
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"}"
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"focuswidget {"
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" padding: 30px;"
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" font-size: 70%;"
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"}"
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"focuswidget button:nth-child(1) {"
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" margin-right: 15px;"
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" margin-bottom: 15px;"
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"}"
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"focuswidget button:nth-child(2) {"
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" margin-left: 15px;"
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" margin-bottom: 15px;"
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"}"
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"focuswidget button:nth-child(3) {"
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" margin-right: 15px;"
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" margin-top: 15px;"
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"}"
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"focuswidget button:nth-child(4) {"
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" margin-left: 15px;"
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" margin-top: 15px;"
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"}"
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"focuswidget button {"
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" min-width: 80px;"
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" min-height: 80px;"
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" margin: 0px;"
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" border: 5px solid green;"
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" border-radius: 0px;"
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" padding: 10px;"
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" background-image: none;"
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" background-color: white;"
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" box-shadow: none;"
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"}"
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"focuswidget button:focus(visible) {"
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" outline-width: 4px;"
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" outline-color: yellow;"
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"}"
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"focuswidget button:hover {"
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" background-color: black;"
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" color: white;"
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"}"
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"focuswidget button label:hover {"
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" background-color: green;"
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"}"
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;
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struct _GtkFocusWidget
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{
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GtkWidget parent_instance;
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double mouse_x;
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double mouse_y;
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union {
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struct {
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GtkWidget *child1;
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GtkWidget *child2;
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GtkWidget *child3;
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GtkWidget *child4;
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};
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GtkWidget* children[4];
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};
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};
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struct _GtkFocusWidgetClass
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{
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GtkWidgetClass parent_class;
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};
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GType gtk_focus_widget_get_type (void) G_GNUC_CONST;
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G_DEFINE_TYPE(GtkFocusWidget, gtk_focus_widget, GTK_TYPE_WIDGET)
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static void
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gtk_focus_widget_size_allocate (GtkWidget *widget,
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int width,
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int height,
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int baseline)
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{
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GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
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int child_width = width / 2;
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int child_height = height / 2;
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GtkAllocation child_alloc;
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child_alloc.x = 0;
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child_alloc.y = 0;
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child_alloc.width = child_width;
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child_alloc.height = child_height;
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gtk_widget_size_allocate (self->child1, &child_alloc, -1);
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child_alloc.x += child_width;
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gtk_widget_size_allocate (self->child2, &child_alloc, -1);
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child_alloc.y += child_height;
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gtk_widget_size_allocate (self->child4, &child_alloc, -1);
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child_alloc.x -= child_width;
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gtk_widget_size_allocate (self->child3, &child_alloc, -1);
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}
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static void
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gtk_focus_widget_measure (GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
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int min, nat;
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int i;
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*minimum = 0;
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*natural = 0;
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for (i = 0; i < 4; i ++)
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{
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gtk_widget_measure (self->children[i], orientation, for_size,
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&min, &nat, NULL, NULL);
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*minimum = MAX (*minimum, min);
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*natural = MAX (*natural, nat);
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}
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*minimum *= 2;
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*natural *= 2;
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}
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static void
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gtk_focus_widget_snapshot (GtkWidget *widget, GtkSnapshot *snapshot)
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{
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GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
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gtk_widget_snapshot_child (widget, self->child1, snapshot);
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gtk_widget_snapshot_child (widget, self->child2, snapshot);
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gtk_widget_snapshot_child (widget, self->child3, snapshot);
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gtk_widget_snapshot_child (widget, self->child4, snapshot);
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if (self->mouse_x != G_MININT && self->mouse_y != G_MININT)
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{
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PangoLayout *layout;
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char *text;
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GtkAllocation alloc;
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graphene_rect_t bounds;
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GdkRGBA black = {0, 0, 0, 1};
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gtk_widget_get_allocation (widget, &alloc);
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/* Since event coordinates and drawing is supposed to happen in the
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* same coodinates space, this should all work out just fine. */
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bounds.origin.x = self->mouse_x;
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bounds.origin.y = -30;
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bounds.size.width = 1;
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bounds.size.height = alloc.height;
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gtk_snapshot_append_color (snapshot,
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&black,
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&bounds);
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bounds.origin.x = -30;
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bounds.origin.y = self->mouse_y;
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bounds.size.width = alloc.width;
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bounds.size.height = 1;
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gtk_snapshot_append_color (snapshot,
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&black,
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&bounds);
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layout = gtk_widget_create_pango_layout (widget, NULL);
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text = g_strdup_printf ("%.2f×%.2f", self->mouse_x, self->mouse_y);
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pango_layout_set_text (layout, text, -1);
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gtk_snapshot_render_layout (snapshot,
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gtk_widget_get_style_context (widget),
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self->mouse_x + 2,
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self->mouse_y - 15, /* *shrug* */
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layout);
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g_free (text);
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g_object_unref (layout);
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}
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}
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static void
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motion_cb (GtkEventControllerMotion *controller,
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gdouble x,
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gdouble y,
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GtkWidget *widget)
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{
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GtkFocusWidget *self = GTK_FOCUS_WIDGET (widget);
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self->mouse_x = x;
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self->mouse_y = y;
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gtk_widget_queue_draw (widget);
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}
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static void
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gtk_focus_widget_finalize (GObject *object)
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{
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GtkFocusWidget *self = GTK_FOCUS_WIDGET (object);
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gtk_widget_unparent (self->child1);
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gtk_widget_unparent (self->child2);
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gtk_widget_unparent (self->child3);
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gtk_widget_unparent (self->child4);
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G_OBJECT_CLASS (gtk_focus_widget_parent_class)->finalize (object);
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}
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static void
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gtk_focus_widget_init (GtkFocusWidget *self)
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{
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GtkEventController *controller;
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self->child1 = gtk_button_new_with_label ("1");
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gtk_widget_set_parent (self->child1, GTK_WIDGET (self));
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self->child2 = gtk_button_new_with_label ("2");
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gtk_widget_set_parent (self->child2, GTK_WIDGET (self));
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self->child3 = gtk_button_new_with_label ("3");
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gtk_widget_set_parent (self->child3, GTK_WIDGET (self));
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self->child4 = gtk_button_new_with_label ("4");
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gtk_widget_set_parent (self->child4, GTK_WIDGET (self));
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self->mouse_x = G_MININT;
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self->mouse_y = G_MININT;
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controller = gtk_event_controller_motion_new ();
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g_signal_connect (controller, "motion",
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G_CALLBACK (motion_cb), self);
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gtk_widget_add_controller (GTK_WIDGET (self), controller);
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}
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static void
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gtk_focus_widget_class_init (GtkFocusWidgetClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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object_class->finalize = gtk_focus_widget_finalize;
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widget_class->snapshot = gtk_focus_widget_snapshot;
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widget_class->measure = gtk_focus_widget_measure;
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widget_class->size_allocate = gtk_focus_widget_size_allocate;
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gtk_widget_class_set_css_name (widget_class, "focuswidget");
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}
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static void
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quit_cb (GtkWidget *widget,
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gpointer user_data)
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{
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gboolean *is_done = user_data;
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*is_done = TRUE;
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g_main_context_wakeup (NULL);
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}
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int
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main(int argc, char **argv)
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{
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GtkWidget *window;
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GtkWidget *widget;
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GtkCssProvider *provider;
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gboolean done = FALSE;
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gtk_init ();
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provider = gtk_css_provider_new ();
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gtk_css_provider_load_from_data (provider, css, -1);
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gtk_style_context_add_provider_for_display (gdk_display_get_default (),
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GTK_STYLE_PROVIDER (provider),
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GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
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window = gtk_window_new ();
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widget = g_object_new (GTK_TYPE_FOCUS_WIDGET, NULL);
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gtk_window_set_decorated (GTK_WINDOW (window), FALSE);
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gtk_container_add (GTK_CONTAINER (window), widget);
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g_signal_connect (window, "destroy", G_CALLBACK (quit_cb), &done);
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gtk_widget_show (window);
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while (!done)
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g_main_context_iteration (NULL, TRUE);
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}
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