Make LdCategorySymbolView show symbols.
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@ -21,17 +21,41 @@
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* onto #LdDiagramView.
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*/
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/* Milimetres per inch. */
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#define MM_PER_INCH 25.4
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/* The default screen resolution in DPI units. */
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#define DEFAULT_SCREEN_RESOLUTION 96
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#define SYMBOL_WIDTH 50 /* Width of a symbol. */
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#define SYMBOL_HEIGHT 40 /* Height of a symbol. */
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#define SYMBOL_SPACING 10 /* Spacing between symbols, and also borders. */
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/*
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* LdCategorySymbolViewPrivate:
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* @category: a category object assigned as a model.
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* @path: path to the category within the library.
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* @layout: (element-type SymbolData *): current layout of symbols.
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* @height_negotiation: whether we are negotiating height right now.
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*/
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struct _LdCategorySymbolViewPrivate
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{
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LdCategory *category;
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gchar *path;
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GSList *layout;
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guint height_negotiation : 1;
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};
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typedef struct
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{
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LdSymbol *symbol; /* The associated symbol, ref'ed. */
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gchar *path; /* Path to the symbol. */
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GdkRectangle rect; /* Clipping rectangle. */
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gdouble scale; /* Scale to draw the symbol in. */
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gdouble dx, dy; /* Delta into .rect. */
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}
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SymbolData;
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enum
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{
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PROP_0,
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@ -98,6 +122,22 @@ ld_category_symbol_view_init (LdCategorySymbolView *self)
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| GDK_LEAVE_NOTIFY_MASK);
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}
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static void
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symbol_data_free (SymbolData *self)
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{
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g_object_unref (self->symbol);
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g_free (self->path);
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g_slice_free (SymbolData, self);
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}
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static void
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layout_destroy (LdCategorySymbolView *self)
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{
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g_slist_foreach (self->priv->layout, (GFunc) symbol_data_free, NULL);
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g_slist_free (self->priv->layout);
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self->priv->layout = NULL;
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}
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static void
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ld_category_symbol_view_finalize (GObject *gobject)
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{
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@ -105,6 +145,7 @@ ld_category_symbol_view_finalize (GObject *gobject)
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self = LD_CATEGORY_SYMBOL_VIEW (gobject);
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layout_destroy (self);
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if (self->priv->category)
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g_object_unref (self->priv->category);
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g_free (self->priv->path);
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@ -148,6 +189,163 @@ ld_category_symbol_view_set_property (GObject *object, guint property_id,
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}
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}
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typedef struct
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{
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guint total_height; /* Total height required to show the symbols. */
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guint max_width; /* Width available to the widget. */
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GSList *cur_row; /* Current row of symbols. */
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guint cur_width; /* Current width of the row. */
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guint cur_height_up; /* Current max. upper height of symbols. */
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guint cur_height_down; /* Current max. lower height of symbols. */
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}
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LayoutContext;
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static GSList *
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layout_finish_row (LayoutContext *ctx)
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{
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GSList *item, *result;
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gint row_height, h_delta;
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row_height = SYMBOL_SPACING + ctx->cur_height_up + ctx->cur_height_down;
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h_delta = (ctx->max_width - ctx->cur_width) / 2;
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for (item = ctx->cur_row; item; item = item->next)
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{
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SymbolData *data;
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data = item->data;
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data->rect.x += h_delta;
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data->rect.height = row_height;
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data->dy = SYMBOL_SPACING * 0.5 + ctx->cur_height_up;
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}
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result = g_slist_reverse (ctx->cur_row);
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ctx->cur_row = NULL;
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ctx->total_height += row_height;
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ctx->cur_width = SYMBOL_SPACING;
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ctx->cur_height_up = 0;
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ctx->cur_height_down = 0;
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return result;
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}
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static gint
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layout_for_width (LdCategorySymbolView *self, gint width)
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{
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GSList *symbols, *iter;
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LayoutContext ctx = {SYMBOL_SPACING, 0, NULL, SYMBOL_SPACING, 0, 0};
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layout_destroy (self);
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ctx.max_width = width;
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symbols = (GSList *) ld_category_get_symbols (self->priv->category);
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for (iter = symbols; iter; iter = iter->next)
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{
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SymbolData *data;
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LdRectangle area;
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LdSymbol *symbol;
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gint real_width, height_up, height_down;
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symbol = LD_SYMBOL (iter->data);
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ld_symbol_get_area (symbol, &area);
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data = g_slice_new (SymbolData);
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data->symbol = g_object_ref (symbol);
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data->path = g_build_path (LD_LIBRARY_IDENTIFIER_SEPARATOR,
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self->priv->path, ld_symbol_get_name (symbol), NULL);
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/* Compute the scale to fit the symbol to an area of
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* SYMBOL_WIDTH * SYMBOL_HEIGHT, vertically centred. */
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data->scale = SYMBOL_HEIGHT * 0.5
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/ MAX (ABS (area.y), ABS (area.y + area.height)) * 0.5;
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if (data->scale * area.width > SYMBOL_WIDTH)
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data->scale = SYMBOL_WIDTH / area.width;
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real_width = data->scale * area.width + 0.5;
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data->rect.width = real_width + SYMBOL_SPACING;
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/* Now I have no idea what this does but it worked before.
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* When I do, I have to write it in here. */
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data->dx = data->rect.width * 0.5 + data->scale
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* (area.width * 0.5 - ABS (area.x + area.width));
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if (ctx.cur_width + real_width + SYMBOL_SPACING > ctx.max_width
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&& ctx.cur_row != NULL)
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{
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self->priv->layout = g_slist_concat (self->priv->layout,
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layout_finish_row (&ctx));
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}
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/* Half of the spacing is included on each side of the rect. */
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data->rect.x = ctx.cur_width - SYMBOL_SPACING / 2;
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data->rect.y = ctx.total_height - SYMBOL_SPACING / 2;
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height_up = data->scale * ABS (area.y);
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height_down = data->scale * ABS (area.y + area.height);
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if (height_up > ctx.cur_height_up)
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ctx.cur_height_up = height_up;
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if (height_down > ctx.cur_height_down)
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ctx.cur_height_down = height_down;
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ctx.cur_row = g_slist_prepend (ctx.cur_row, data);
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ctx.cur_width += real_width + SYMBOL_SPACING;
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}
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if (ctx.cur_row != NULL)
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self->priv->layout = g_slist_concat (self->priv->layout,
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layout_finish_row (&ctx));
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return ctx.total_height;
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}
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static gboolean
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on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
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{
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LdCategorySymbolView *self;
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cairo_t *cr;
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GSList *iter;
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self = LD_CATEGORY_SYMBOL_VIEW (widget);
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cr = gdk_cairo_create (gtk_widget_get_window (widget));
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gdk_cairo_rectangle (cr, &event->area);
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cairo_clip (cr);
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gdk_cairo_set_source_color (cr,
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>k_widget_get_style (widget)->base[GTK_STATE_NORMAL]);
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cairo_paint (cr);
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for (iter = self->priv->layout; iter; iter = iter->next)
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{
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SymbolData *data;
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data = iter->data;
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if (!gdk_rectangle_intersect (&data->rect, &event->area, NULL))
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continue;
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cairo_save (cr);
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gdk_cairo_rectangle (cr, &data->rect);
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cairo_clip (cr);
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cairo_translate (cr, data->rect.x + data->dx, data->rect.y + data->dy);
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cairo_scale (cr, data->scale, data->scale);
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gdk_cairo_set_source_color (cr,
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>k_widget_get_style (widget)->text[GTK_STATE_NORMAL]);
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cairo_set_line_width (cr, 1 / data->scale);
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ld_symbol_draw (data->symbol, cr);
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cairo_restore (cr);
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}
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cairo_destroy (cr);
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return FALSE;
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}
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static void
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on_size_request (GtkWidget *widget, GtkRequisition *requisition,
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gpointer user_data)
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@ -156,17 +354,25 @@ on_size_request (GtkWidget *widget, GtkRequisition *requisition,
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self = LD_CATEGORY_SYMBOL_VIEW (widget);
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requisition->width = 10;
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if (!self->priv->category
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|| !ld_category_get_symbols (self->priv->category))
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{
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requisition->width = 0;
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requisition->height = 0;
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return;
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}
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requisition->width = SYMBOL_WIDTH + 2 * SYMBOL_SPACING;
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if (self->priv->height_negotiation)
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{
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GtkAllocation alloc;
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gtk_widget_get_allocation (widget, &alloc);
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requisition->height = 5000 / alloc.width;
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requisition->height = layout_for_width (self, alloc.width);
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}
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else
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requisition->height = 10;
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requisition->height = SYMBOL_HEIGHT + 2 * SYMBOL_SPACING;
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}
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static void
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@ -186,23 +392,6 @@ on_size_allocate (GtkWidget *widget, GdkRectangle *allocation,
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}
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}
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static gboolean
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on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
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{
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cairo_t *cr;
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cr = gdk_cairo_create (gtk_widget_get_window (widget));
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gdk_cairo_rectangle (cr, &event->area);
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cairo_clip (cr);
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gdk_cairo_set_source_color (cr,
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>k_widget_get_style (widget)->base[GTK_STATE_NORMAL]);
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cairo_paint (cr);
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cairo_destroy (cr);
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return FALSE;
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}
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/* ===== Generic interface etc. ============================================ */
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/**
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@ -251,6 +440,7 @@ ld_category_symbol_view_set_category (LdCategorySymbolView *self,
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g_object_ref (category);
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g_object_notify (G_OBJECT (self), "category");
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gtk_widget_queue_resize (GTK_WIDGET (self));
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}
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/**
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