logdiag/liblogdiag/ld-category-symbol-view.c

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2012-09-05 19:39:22 +02:00
/*
* ld-category-symbol-view.c
*
* This file is a part of logdiag.
* Copyright Přemysl Janouch 2012. All rights reserved.
*
* See the file LICENSE for licensing information.
*
*/
#include "liblogdiag.h"
#include "config.h"
/**
* SECTION:ld-category-symbol-view
* @short_description: A widget that displays symbols in a category
* @see_also: #LdCategory, #LdDiagramView
*
* #LdCategorySymbolView allows the user to drag symbols from an #LdCategory
* 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. */
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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;
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/*
* 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.
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* @preselected: currently preselected symbol.
* @height_negotiation: whether we are negotiating height right now.
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*/
struct _LdCategorySymbolViewPrivate
{
LdCategory *category;
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gchar *path;
GSList *layout;
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SymbolData *preselected;
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guint height_negotiation : 1;
};
enum
{
PROP_0,
PROP_CATEGORY
};
static void ld_category_symbol_view_get_property (GObject *object,
guint property_id, GValue *value, GParamSpec *pspec);
static void ld_category_symbol_view_set_property (GObject *object,
guint property_id, const GValue *value, GParamSpec *pspec);
static void ld_category_symbol_view_finalize (GObject *gobject);
static void on_size_request (GtkWidget *widget, GtkRequisition *requisition,
gpointer user_data);
static void on_size_allocate (GtkWidget *widget, GdkRectangle *allocation,
gpointer user_data);
static gboolean on_expose_event (GtkWidget *widget, GdkEventExpose *event,
gpointer user_data);
G_DEFINE_TYPE (LdCategorySymbolView,
ld_category_symbol_view, GTK_TYPE_DRAWING_AREA);
static void
ld_category_symbol_view_class_init (LdCategorySymbolViewClass *klass)
{
GObjectClass *object_class;
GParamSpec *pspec;
object_class = G_OBJECT_CLASS (klass);
object_class->get_property = ld_category_symbol_view_get_property;
object_class->set_property = ld_category_symbol_view_set_property;
object_class->finalize = ld_category_symbol_view_finalize;
/**
* LdCategorySymbolView:category:
*
* The underlying #LdCategory object of this view.
*/
pspec = g_param_spec_object ("category", "Category",
"The underlying category object of this view.",
LD_TYPE_CATEGORY, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_CATEGORY, pspec);
g_type_class_add_private (klass, sizeof (LdCategorySymbolViewPrivate));
}
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static void
symbol_redraw (LdCategorySymbolView *self, SymbolData *symbol)
{
gtk_widget_queue_draw_area (GTK_WIDGET (self),
symbol->rect.x,
symbol->rect.y,
symbol->rect.width,
symbol->rect.height);
}
static void
symbol_deselect (LdCategorySymbolView *self)
{
if (!self->priv->preselected)
return;
symbol_redraw (self, self->priv->preselected);
self->priv->preselected = NULL;
gtk_drag_source_unset (GTK_WIDGET (self));
}
static gboolean
on_leave_notify (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data)
{
symbol_deselect (LD_CATEGORY_SYMBOL_VIEW (widget));
return FALSE;
}
static gboolean
on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data)
{
LdCategorySymbolView *self;
GSList *iter;
if (event->state & GDK_BUTTON1_MASK)
return FALSE;
self = LD_CATEGORY_SYMBOL_VIEW (widget);
for (iter = self->priv->layout; iter; iter = iter->next)
{
SymbolData *data;
data = iter->data;
if (event->x < data->rect.x
|| event->y < data->rect.y
|| event->x >= data->rect.x + data->rect.width
|| event->y >= data->rect.y + data->rect.height)
continue;
if (data != self->priv->preselected)
{
GtkTargetEntry target = {"ld-symbol", GTK_TARGET_SAME_APP, 0};
symbol_deselect (self);
self->priv->preselected = data;
symbol_redraw (self, data);
gtk_drag_source_set (widget,
GDK_BUTTON1_MASK, &target, 1, GDK_ACTION_COPY);
}
return FALSE;
}
symbol_deselect (self);
return FALSE;
}
static void
on_drag_data_get
(GtkWidget *widget, GdkDragContext *ctx, GtkSelectionData *selection_data,
guint target_type, guint time, gpointer user_data)
{
LdCategorySymbolView *self;
self = LD_CATEGORY_SYMBOL_VIEW (widget);
g_return_if_fail (self->priv->preselected != NULL);
gtk_selection_data_set (selection_data,
gtk_selection_data_get_target (selection_data),
8, (guchar *) self->priv->preselected->path,
strlen (self->priv->preselected->path));
}
static void
on_drag_begin (GtkWidget *widget, GdkDragContext *ctx, gpointer user_data)
{
LdCategorySymbolView *self;
GdkPixbuf *pbuf;
self = LD_CATEGORY_SYMBOL_VIEW (widget);
g_return_if_fail (self->priv->preselected != NULL);
/* Some of the larger previews didn't work, and we have to get rid of
* the icon later when we're hovering above LdDiagramView anyway. */
pbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, 1, 1);
gdk_pixbuf_fill (pbuf, 0x00000000);
gtk_drag_set_icon_pixbuf (ctx, pbuf, 0, 0);
g_object_unref (pbuf);
}
static void
on_drag_end (GtkWidget *widget, GdkDragContext *ctx, gpointer user_data)
{
symbol_deselect (LD_CATEGORY_SYMBOL_VIEW (widget));
}
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static void
ld_category_symbol_view_init (LdCategorySymbolView *self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE
(self, LD_TYPE_CATEGORY_SYMBOL_VIEW, LdCategorySymbolViewPrivate);
g_signal_connect (self, "size-allocate",
G_CALLBACK (on_size_allocate), NULL);
g_signal_connect (self, "size-request",
G_CALLBACK (on_size_request), NULL);
g_signal_connect (self, "expose-event",
G_CALLBACK (on_expose_event), NULL);
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g_signal_connect (self, "motion-notify-event",
G_CALLBACK (on_motion_notify), NULL);
g_signal_connect (self, "leave-notify-event",
G_CALLBACK (on_leave_notify), NULL);
g_signal_connect (self, "drag-begin",
G_CALLBACK (on_drag_begin), NULL);
g_signal_connect (self, "drag-data-get",
G_CALLBACK (on_drag_data_get), NULL);
g_signal_connect (self, "drag-end",
G_CALLBACK (on_drag_end), NULL);
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gtk_widget_add_events (GTK_WIDGET (self),
GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK
| GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK
| 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;
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self->priv->preselected = NULL;
}
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static void
ld_category_symbol_view_finalize (GObject *gobject)
{
LdCategorySymbolView *self;
self = LD_CATEGORY_SYMBOL_VIEW (gobject);
layout_destroy (self);
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if (self->priv->category)
g_object_unref (self->priv->category);
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g_free (self->priv->path);
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/* Chain up to the parent class. */
G_OBJECT_CLASS (ld_category_symbol_view_parent_class)->finalize (gobject);
}
static void
ld_category_symbol_view_get_property (GObject *object, guint property_id,
GValue *value, GParamSpec *pspec)
{
LdCategorySymbolView *self;
self = LD_CATEGORY_SYMBOL_VIEW (object);
switch (property_id)
{
case PROP_CATEGORY:
g_value_set_object (value, ld_category_symbol_view_get_category (self));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ld_category_symbol_view_set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec)
{
LdCategorySymbolView *self;
self = LD_CATEGORY_SYMBOL_VIEW (object);
switch (property_id)
{
case PROP_CATEGORY:
ld_category_symbol_view_set_category (self,
LD_CATEGORY (g_value_get_object (value)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
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);
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gdk_cairo_set_source_color (cr,
&gtk_widget_get_style (widget)->text[GTK_STATE_NORMAL]);
if (data == self->priv->preselected)
cairo_paint_with_alpha (cr, 0.1);
cairo_translate (cr, data->rect.x + data->dx, data->rect.y + data->dy);
cairo_scale (cr, data->scale, data->scale);
cairo_set_line_width (cr, 1 / data->scale);
ld_symbol_draw (data->symbol, cr);
cairo_restore (cr);
}
cairo_destroy (cr);
return FALSE;
}
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static void
on_size_request (GtkWidget *widget, GtkRequisition *requisition,
gpointer user_data)
{
LdCategorySymbolView *self;
self = LD_CATEGORY_SYMBOL_VIEW (widget);
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;
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if (self->priv->height_negotiation)
{
GtkAllocation alloc;
gtk_widget_get_allocation (widget, &alloc);
requisition->height = layout_for_width (self, alloc.width);
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}
else
requisition->height = SYMBOL_HEIGHT + 2 * SYMBOL_SPACING;
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}
static void
on_size_allocate (GtkWidget *widget, GdkRectangle *allocation,
gpointer user_data)
{
LdCategorySymbolView *self;
self = LD_CATEGORY_SYMBOL_VIEW (widget);
if (self->priv->height_negotiation)
self->priv->height_negotiation = FALSE;
else
{
self->priv->height_negotiation = TRUE;
gtk_widget_queue_resize (widget);
}
}
/* ===== Generic interface etc. ============================================ */
/**
* ld_category_symbol_view_new:
* @category: (allow-none): a category to be assigned to the widget.
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*
* Create an instance.
*/
GtkWidget *
ld_category_symbol_view_new (LdCategory *category)
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{
LdCategorySymbolView *self;
self = g_object_new (LD_TYPE_CATEGORY_SYMBOL_VIEW, NULL);
ld_category_symbol_view_set_category (self, category);
return GTK_WIDGET (self);
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}
/**
* ld_category_symbol_view_set_category:
* @self: an #LdCategorySymbolView object.
* @category: the #LdCategory to be assigned to the view.
*
* Assign an #LdCategory object to the view.
*/
void
ld_category_symbol_view_set_category (LdCategorySymbolView *self,
LdCategory *category)
{
g_return_if_fail (LD_IS_CATEGORY_SYMBOL_VIEW (self));
g_return_if_fail (LD_IS_CATEGORY (category));
if (self->priv->category)
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{
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g_object_unref (self->priv->category);
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g_free (self->priv->path);
self->priv->path = NULL;
}
/* XXX: We should rebuild the path if the name changes but it shouldn't
* happen and we would have to track the parents, too. */
self->priv->path = ld_category_get_path (category);
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self->priv->category = category;
g_object_ref (category);
g_object_notify (G_OBJECT (self), "category");
gtk_widget_queue_resize (GTK_WIDGET (self));
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}
/**
* ld_category_symbol_view_get_category:
* @self: an #LdCategorySymbolView object.
*
* Get the #LdCategory object assigned to this view.
* The reference count on the category is not incremented.
*/
LdCategory *
ld_category_symbol_view_get_category (LdCategorySymbolView *self)
{
g_return_val_if_fail (LD_IS_CATEGORY_SYMBOL_VIEW (self), NULL);
return self->priv->category;
}