diff options
Diffstat (limited to 'src/ld-canvas.c')
| -rw-r--r-- | src/ld-canvas.c | 160 |
1 files changed, 157 insertions, 3 deletions
diff --git a/src/ld-canvas.c b/src/ld-canvas.c index 06b12d2..32ec444 100644 --- a/src/ld-canvas.c +++ b/src/ld-canvas.c @@ -13,10 +13,9 @@ #include "config.h" #include "ld-marshal.h" -#include "ld-canvas.h" #include "ld-document.h" +#include "ld-canvas.h" -/* http://www.gnomejournal.org/article/34/writing-a-widget-using-cairo-and-gtk28 */ /** * SECTION:ld-canvas @@ -37,19 +36,56 @@ struct _LdCanvasPrivate G_DEFINE_TYPE (LdCanvas, ld_canvas, GTK_TYPE_DRAWING_AREA); +enum +{ + PROP_0, + PROP_DOCUMENT +}; + +static void +ld_canvas_get_property (GObject *object, guint property_id, + GValue *value, GParamSpec *pspec); + +static void +ld_canvas_set_property (GObject *object, guint property_id, + const GValue *value, GParamSpec *pspec); + static void ld_canvas_finalize (GObject *gobject); +static gboolean +on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data); + +static void +draw_grid (GtkWidget *widget, cairo_t *cr); + +static void +canvas_paint (GtkWidget *widget, cairo_t *cr); + + static void ld_canvas_class_init (LdCanvasClass *klass) { GObjectClass *object_class; GtkWidgetClass *widget_class; + GParamSpec *pspec; object_class = G_OBJECT_CLASS (klass); + object_class->get_property = ld_canvas_get_property; + object_class->set_property = ld_canvas_set_property; object_class->finalize = ld_canvas_finalize; +/** + * LdCanvas:document: + * + * The underlying #LdDocument object of this canvas. + */ + pspec = g_param_spec_object ("document", "Document", + "The underlying document object of this canvas.", + LD_TYPE_DOCUMENT, G_PARAM_READWRITE); + g_object_class_install_property (object_class, PROP_DOCUMENT, pspec); + widget_class = GTK_WIDGET_CLASS (klass); /* TODO: Scrolling support; make the comment bellow a gtk-doc comment then. */ @@ -63,7 +99,7 @@ ld_canvas_class_init (LdCanvasClass *klass) widget_class->set_scroll_adjustments_signal = g_signal_new ("set-scroll-adjustments", G_TYPE_FROM_CLASS (widget_class), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, - 0, // G_STRUCT_OFFSET (LdCanvasClass, ...) + G_STRUCT_OFFSET (LdCanvasClass, set_scroll_adjustments), NULL, NULL, g_cclosure_user_marshal_VOID__OBJECT_OBJECT, G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT); @@ -76,6 +112,8 @@ ld_canvas_init (LdCanvas *self) { self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, LD_TYPE_CANVAS, LdCanvasPrivate); + + g_signal_connect (self, "expose-event", G_CALLBACK (on_expose_event), NULL); } static void @@ -89,6 +127,40 @@ ld_canvas_finalize (GObject *gobject) G_OBJECT_CLASS (ld_canvas_parent_class)->finalize (gobject); } +static void +ld_canvas_get_property (GObject *object, guint property_id, + GValue *value, GParamSpec *pspec) +{ + LdCanvas *self; + + self = LD_CANVAS (object); + switch (property_id) + { + case PROP_DOCUMENT: + g_value_set_object (value, ld_canvas_get_document (self)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + } +} + +static void +ld_canvas_set_property (GObject *object, guint property_id, + const GValue *value, GParamSpec *pspec) +{ + LdCanvas *self; + + self = LD_CANVAS (object); + switch (property_id) + { + case PROP_DOCUMENT: + ld_canvas_set_document (self, LD_DOCUMENT (g_value_get_object (value))); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + } +} + /** * ld_canvas_new: * @@ -99,3 +171,85 @@ ld_canvas_new (void) { return g_object_new (LD_TYPE_CANVAS, NULL); } + +/** + * ld_canvas_set_document: + * @self: An #LdCanvas object. + * @document: The #LdDocument to be assigned to the canvas. + * + * Assign an #LdDocument object to the canvas. + */ +void +ld_canvas_set_document (LdCanvas *self, LdDocument *document) +{ + self->priv->document = document; +} + +/** + * ld_canvas_get_document: + * @self: An #LdCanvas object. + * + * Get the #LdDocument object assigned to this canvas. + * The reference count on the document is not incremented. + */ +LdDocument * +ld_canvas_get_document (LdCanvas *self) +{ + return self->priv->document; +} + +static gboolean +on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data) +{ + cairo_t *cr; + + cr = gdk_cairo_create (widget->window); + + cairo_rectangle (cr, event->area.x, event->area.y, + event->area.width, event->area.height); + cairo_clip (cr); + + canvas_paint (widget, cr); + + cairo_destroy (cr); + + return FALSE; +} + +static void +draw_grid (GtkWidget *widget, cairo_t *cr) +{ + int x, y; + + /* Drawing points: + * http://lists.freedesktop.org/archives/cairo/2009-June/017459.html + */ + cairo_set_source_rgb (cr, 0.5, 0.5, 0.5); + cairo_set_line_width (cr, 1); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); + + /* FIXME: Invariable grid size; it's slow because it draws whole area. */ + for (x = 0; x < widget->allocation.width; x += 20) + { + for (y = 0; y < widget->allocation.height; y += 20) + { + /* Drawing sharp lines (also applies to these dots): + * http://www.cairographics.org/FAQ/#sharp_lines + */ + cairo_move_to (cr, x + 0.5, y + 0.5); + cairo_close_path (cr); + cairo_stroke (cr); + } + } +} + +static void +canvas_paint (GtkWidget *widget, cairo_t *cr) +{ + /* Paint a white background. */ + cairo_set_source_rgb (cr, 1, 1, 1); + cairo_paint (cr); + + draw_grid (widget, cr); +} + |