Make LdCategorySymbolView show symbols.

This commit is contained in:
Přemysl Eric Janouch 2012-09-09 23:43:53 +02:00
parent 09d6bda3db
commit c12c6fbf56

View File

@ -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,
@ -98,6 +122,22 @@ ld_category_symbol_view_init (LdCategorySymbolView *self)
| GDK_LEAVE_NOTIFY_MASK);
}
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)
{
@ -105,6 +145,7 @@ ld_category_symbol_view_finalize (GObject *gobject)
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));
}
/**