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-rw-r--r--liblogdiag/ld-category-symbol-view.c230
1 files changed, 210 insertions, 20 deletions
diff --git a/liblogdiag/ld-category-symbol-view.c b/liblogdiag/ld-category-symbol-view.c
index 36c0d0f..e9e9e6c 100644
--- a/liblogdiag/ld-category-symbol-view.c
+++ b/liblogdiag/ld-category-symbol-view.c
@@ -21,17 +21,41 @@
* onto #LdDiagramView.
*/
+/* Milimetres per inch. */
+#define MM_PER_INCH 25.4
+/* The default screen resolution in DPI units. */
+#define DEFAULT_SCREEN_RESOLUTION 96
+
+#define SYMBOL_WIDTH 50 /* Width of a symbol. */
+#define SYMBOL_HEIGHT 40 /* Height of a symbol. */
+#define SYMBOL_SPACING 10 /* Spacing between symbols, and also borders. */
+
/*
* LdCategorySymbolViewPrivate:
* @category: a category object assigned as a model.
+ * @path: path to the category within the library.
+ * @layout: (element-type SymbolData *): current layout of symbols.
+ * @height_negotiation: whether we are negotiating height right now.
*/
struct _LdCategorySymbolViewPrivate
{
LdCategory *category;
gchar *path;
+ GSList *layout;
guint height_negotiation : 1;
};
+typedef struct
+{
+ LdSymbol *symbol; /* The associated symbol, ref'ed. */
+ gchar *path; /* Path to the symbol. */
+
+ GdkRectangle rect; /* Clipping rectangle. */
+ gdouble scale; /* Scale to draw the symbol in. */
+ gdouble dx, dy; /* Delta into .rect. */
+}
+SymbolData;
+
enum
{
PROP_0,
@@ -99,12 +123,29 @@ ld_category_symbol_view_init (LdCategorySymbolView *self)
}
static void
+symbol_data_free (SymbolData *self)
+{
+ g_object_unref (self->symbol);
+ g_free (self->path);
+ g_slice_free (SymbolData, self);
+}
+
+static void
+layout_destroy (LdCategorySymbolView *self)
+{
+ g_slist_foreach (self->priv->layout, (GFunc) symbol_data_free, NULL);
+ g_slist_free (self->priv->layout);
+ self->priv->layout = NULL;
+}
+
+static void
ld_category_symbol_view_finalize (GObject *gobject)
{
LdCategorySymbolView *self;
self = LD_CATEGORY_SYMBOL_VIEW (gobject);
+ layout_destroy (self);
if (self->priv->category)
g_object_unref (self->priv->category);
g_free (self->priv->path);
@@ -148,6 +189,163 @@ ld_category_symbol_view_set_property (GObject *object, guint property_id,
}
}
+
+typedef struct
+{
+ guint total_height; /* Total height required to show the symbols. */
+ guint max_width; /* Width available to the widget. */
+
+ GSList *cur_row; /* Current row of symbols. */
+ guint cur_width; /* Current width of the row. */
+ guint cur_height_up; /* Current max. upper height of symbols. */
+ guint cur_height_down; /* Current max. lower height of symbols. */
+}
+LayoutContext;
+
+static GSList *
+layout_finish_row (LayoutContext *ctx)
+{
+ GSList *item, *result;
+ gint row_height, h_delta;
+
+ row_height = SYMBOL_SPACING + ctx->cur_height_up + ctx->cur_height_down;
+ h_delta = (ctx->max_width - ctx->cur_width) / 2;
+
+ for (item = ctx->cur_row; item; item = item->next)
+ {
+ SymbolData *data;
+
+ data = item->data;
+ data->rect.x += h_delta;
+ data->rect.height = row_height;
+ data->dy = SYMBOL_SPACING * 0.5 + ctx->cur_height_up;
+ }
+
+ result = g_slist_reverse (ctx->cur_row);
+
+ ctx->cur_row = NULL;
+ ctx->total_height += row_height;
+
+ ctx->cur_width = SYMBOL_SPACING;
+ ctx->cur_height_up = 0;
+ ctx->cur_height_down = 0;
+
+ return result;
+}
+
+static gint
+layout_for_width (LdCategorySymbolView *self, gint width)
+{
+ GSList *symbols, *iter;
+ LayoutContext ctx = {SYMBOL_SPACING, 0, NULL, SYMBOL_SPACING, 0, 0};
+
+ layout_destroy (self);
+ ctx.max_width = width;
+
+ symbols = (GSList *) ld_category_get_symbols (self->priv->category);
+ for (iter = symbols; iter; iter = iter->next)
+ {
+ SymbolData *data;
+ LdRectangle area;
+ LdSymbol *symbol;
+ gint real_width, height_up, height_down;
+
+ symbol = LD_SYMBOL (iter->data);
+ ld_symbol_get_area (symbol, &area);
+
+ data = g_slice_new (SymbolData);
+ data->symbol = g_object_ref (symbol);
+ data->path = g_build_path (LD_LIBRARY_IDENTIFIER_SEPARATOR,
+ self->priv->path, ld_symbol_get_name (symbol), NULL);
+
+ /* Compute the scale to fit the symbol to an area of
+ * SYMBOL_WIDTH * SYMBOL_HEIGHT, vertically centred. */
+ data->scale = SYMBOL_HEIGHT * 0.5
+ / MAX (ABS (area.y), ABS (area.y + area.height)) * 0.5;
+ if (data->scale * area.width > SYMBOL_WIDTH)
+ data->scale = SYMBOL_WIDTH / area.width;
+
+ real_width = data->scale * area.width + 0.5;
+ data->rect.width = real_width + SYMBOL_SPACING;
+ /* Now I have no idea what this does but it worked before.
+ * When I do, I have to write it in here. */
+ data->dx = data->rect.width * 0.5 + data->scale
+ * (area.width * 0.5 - ABS (area.x + area.width));
+
+ if (ctx.cur_width + real_width + SYMBOL_SPACING > ctx.max_width
+ && ctx.cur_row != NULL)
+ {
+ self->priv->layout = g_slist_concat (self->priv->layout,
+ layout_finish_row (&ctx));
+ }
+
+ /* Half of the spacing is included on each side of the rect. */
+ data->rect.x = ctx.cur_width - SYMBOL_SPACING / 2;
+ data->rect.y = ctx.total_height - SYMBOL_SPACING / 2;
+
+ height_up = data->scale * ABS (area.y);
+ height_down = data->scale * ABS (area.y + area.height);
+
+ if (height_up > ctx.cur_height_up)
+ ctx.cur_height_up = height_up;
+ if (height_down > ctx.cur_height_down)
+ ctx.cur_height_down = height_down;
+
+ ctx.cur_row = g_slist_prepend (ctx.cur_row, data);
+ ctx.cur_width += real_width + SYMBOL_SPACING;
+ }
+
+ if (ctx.cur_row != NULL)
+ self->priv->layout = g_slist_concat (self->priv->layout,
+ layout_finish_row (&ctx));
+
+ return ctx.total_height;
+}
+
+
+static gboolean
+on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
+{
+ LdCategorySymbolView *self;
+ cairo_t *cr;
+ GSList *iter;
+
+ self = LD_CATEGORY_SYMBOL_VIEW (widget);
+ cr = gdk_cairo_create (gtk_widget_get_window (widget));
+ gdk_cairo_rectangle (cr, &event->area);
+ cairo_clip (cr);
+
+ gdk_cairo_set_source_color (cr,
+ &gtk_widget_get_style (widget)->base[GTK_STATE_NORMAL]);
+ cairo_paint (cr);
+
+ for (iter = self->priv->layout; iter; iter = iter->next)
+ {
+ SymbolData *data;
+
+ data = iter->data;
+ if (!gdk_rectangle_intersect (&data->rect, &event->area, NULL))
+ continue;
+
+ cairo_save (cr);
+ gdk_cairo_rectangle (cr, &data->rect);
+ cairo_clip (cr);
+
+ cairo_translate (cr, data->rect.x + data->dx, data->rect.y + data->dy);
+ cairo_scale (cr, data->scale, data->scale);
+
+ gdk_cairo_set_source_color (cr,
+ &gtk_widget_get_style (widget)->text[GTK_STATE_NORMAL]);
+ cairo_set_line_width (cr, 1 / data->scale);
+ ld_symbol_draw (data->symbol, cr);
+
+ cairo_restore (cr);
+ }
+
+ cairo_destroy (cr);
+ return FALSE;
+}
+
static void
on_size_request (GtkWidget *widget, GtkRequisition *requisition,
gpointer user_data)
@@ -156,17 +354,25 @@ on_size_request (GtkWidget *widget, GtkRequisition *requisition,
self = LD_CATEGORY_SYMBOL_VIEW (widget);
- requisition->width = 10;
+ if (!self->priv->category
+ || !ld_category_get_symbols (self->priv->category))
+ {
+ requisition->width = 0;
+ requisition->height = 0;
+ return;
+ }
+
+ requisition->width = SYMBOL_WIDTH + 2 * SYMBOL_SPACING;
if (self->priv->height_negotiation)
{
GtkAllocation alloc;
gtk_widget_get_allocation (widget, &alloc);
- requisition->height = 5000 / alloc.width;
+ requisition->height = layout_for_width (self, alloc.width);
}
else
- requisition->height = 10;
+ requisition->height = SYMBOL_HEIGHT + 2 * SYMBOL_SPACING;
}
static void
@@ -186,23 +392,6 @@ on_size_allocate (GtkWidget *widget, GdkRectangle *allocation,
}
}
-static gboolean
-on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
-{
- cairo_t *cr;
-
- cr = gdk_cairo_create (gtk_widget_get_window (widget));
- gdk_cairo_rectangle (cr, &event->area);
- cairo_clip (cr);
-
- gdk_cairo_set_source_color (cr,
- &gtk_widget_get_style (widget)->base[GTK_STATE_NORMAL]);
- cairo_paint (cr);
-
- cairo_destroy (cr);
- return FALSE;
-}
-
/* ===== Generic interface etc. ============================================ */
/**
@@ -251,6 +440,7 @@ ld_category_symbol_view_set_category (LdCategorySymbolView *self,
g_object_ref (category);
g_object_notify (G_OBJECT (self), "category");
+ gtk_widget_queue_resize (GTK_WIDGET (self));
}
/**
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-25 10:10:40 +0000