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gtk2/gtk/gtkcssgadget.c
Emmanuele Bassi b4808c187f Silence a compiler warning 
GCC complains with boxed out arguments that may be unset.
2020-03-13 16:05:13 +00:00

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/*
* Copyright © 2015 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gtkcssgadgetprivate.h"
#include <math.h>
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssshadowsvalueprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcsswidgetnodeprivate.h"
#include "gtkrenderbackgroundprivate.h"
#include "gtkrenderborderprivate.h"
#include "gtkdebug.h"
#include "gtkprivate.h"
/*
* Gadgets are 'next-generation widgets' - they combine a CSS node
* for style matching with geometry management and drawing. Each gadget
* corresponds to 'CSS box'. Compared to traditional widgets, they are more
* like building blocks - a typical GTK+ widget will have multiple gadgets,
* for example a check button has its main gadget, and sub-gadgets for
* the checkmark and the text.
*
* Gadgets are not themselves hierarchically organized, but it is common
* to have a 'main' gadget, which gets used by the widgets size_allocate,
* get_preferred_width, etc. and draw callbacks, and which in turn calls out
* to the sub-gadgets. This call tree might extend further if there are
* sub-sub-gadgets that a allocated relative to sub-gadgets. In typical
* situations, the callback chain will reflect the tree structure of the
* gadgets CSS nodes.
*
* Geometry management - Gadgets implement much of the CSS box model for you:
* margins, border, padding, shadows, min-width/height are all applied automatically.
*
* Drawing - Gadgets implement standardized CSS drawing for you: background,
* shadows and border are drawn before any custom drawing, and the focus outline
* is (optionally) drawn afterwards.
*
* Invalidation - Gadgets sit 'between' widgets and CSS nodes, and connect
* to the nodes ::style-changed signal and trigger appropriate invalidations
* on the widget side.
*/
typedef struct _GtkCssGadgetPrivate GtkCssGadgetPrivate;
struct _GtkCssGadgetPrivate {
GtkCssNode *node;
GtkWidget *owner;
GtkAllocation allocated_size;
gint allocated_baseline;
};
enum {
PROP_0,
PROP_NODE,
PROP_OWNER,
/* add more */
NUM_PROPERTIES
};
static GParamSpec *properties[NUM_PROPERTIES];
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GtkCssGadget, gtk_css_gadget, G_TYPE_OBJECT,
G_ADD_PRIVATE (GtkCssGadget))
static void
gtk_css_gadget_real_get_preferred_size (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline)
{
*minimum = 0;
*natural = 0;
if (minimum_baseline)
*minimum_baseline = 0;
if (natural_baseline)
*natural_baseline = 0;
}
static void
gtk_css_gadget_real_allocate (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip)
{
*out_clip = *allocation;
}
static gboolean
gtk_css_gadget_real_draw (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height)
{
return FALSE;
}
static void
gtk_css_gadget_real_style_changed (GtkCssGadget *gadget,
GtkCssStyleChange *change)
{
if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_SIZE))
gtk_css_gadget_queue_resize (gadget);
else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_CLIP))
gtk_css_gadget_queue_allocate (gadget);
else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_REDRAW))
gtk_css_gadget_queue_draw (gadget);
}
static void
gtk_css_gadget_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (GTK_CSS_GADGET (object));
switch (property_id)
{
case PROP_NODE:
g_value_set_object (value, priv->node);
break;
case PROP_OWNER:
g_value_set_object (value, priv->owner);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_css_gadget_node_style_changed_cb (GtkCssNode *node,
GtkCssStyleChange *change,
GtkCssGadget *gadget)
{
GtkCssGadgetClass *klass = GTK_CSS_GADGET_GET_CLASS (gadget);
klass->style_changed (gadget, change);
}
static gboolean
gtk_css_gadget_should_connect_style_changed (GtkCssNode *node)
{
/* Delegate to WidgetClass->style_changed */
if (GTK_IS_CSS_WIDGET_NODE (node))
return FALSE;
return TRUE;
}
static void
gtk_css_gadget_unset_node (GtkCssGadget *gadget)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
if (priv->node)
{
if (gtk_css_gadget_should_connect_style_changed (priv->node))
{
if (g_signal_handlers_disconnect_by_func (priv->node, gtk_css_gadget_node_style_changed_cb, gadget) != 1)
{
g_assert_not_reached ();
}
}
g_object_unref (priv->node);
priv->node = NULL;
}
}
void
gtk_css_gadget_set_node (GtkCssGadget *gadget,
GtkCssNode *node)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
gtk_css_gadget_unset_node (gadget);
if (node != NULL)
priv->node = g_object_ref (node);
else
priv->node = gtk_css_node_new ();
if (gtk_css_gadget_should_connect_style_changed (priv->node))
{
g_signal_connect_after (priv->node,
"style-changed",
G_CALLBACK (gtk_css_gadget_node_style_changed_cb),
gadget);
}
}
static void
gtk_css_gadget_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkCssGadget *gadget = GTK_CSS_GADGET (object);
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
switch (property_id)
{
case PROP_NODE:
gtk_css_gadget_set_node (gadget, g_value_get_object (value));
break;
case PROP_OWNER:
priv->owner = g_value_get_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_css_gadget_finalize (GObject *object)
{
GtkCssGadget *gadget = GTK_CSS_GADGET (object);
gtk_css_gadget_unset_node (gadget);
G_OBJECT_CLASS (gtk_css_gadget_parent_class)->finalize (object);
}
static void
gtk_css_gadget_class_init (GtkCssGadgetClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->get_property = gtk_css_gadget_get_property;
object_class->set_property = gtk_css_gadget_set_property;
object_class->finalize = gtk_css_gadget_finalize;
klass->get_preferred_size = gtk_css_gadget_real_get_preferred_size;
klass->allocate = gtk_css_gadget_real_allocate;
klass->draw = gtk_css_gadget_real_draw;
klass->style_changed = gtk_css_gadget_real_style_changed;
properties[PROP_NODE] = g_param_spec_object ("node", "Node",
"CSS node",
GTK_TYPE_CSS_NODE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
properties[PROP_OWNER] = g_param_spec_object ("owner", "Owner",
"Widget that created and owns this gadget",
GTK_TYPE_WIDGET,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
}
static void
gtk_css_gadget_init (GtkCssGadget *gadget)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
priv->allocated_size.width = -1;
priv->allocated_size.height = -1;
priv->allocated_baseline = -1;
}
/**
* gtk_css_gadget_get_node:
* @gadget: a #GtkCssGadget
*
* Get the CSS node for this gadget.
*
* Returns: (transfer none): the CSS node
*/
GtkCssNode *
gtk_css_gadget_get_node (GtkCssGadget *gadget)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
return priv->node;
}
/**
* gtk_css_gadget_get_style:
* @gadget: a #GtkCssGadget
*
* Get the CSS style for this gadget.
*
* Returns: (transfer none): the CSS style
*/
GtkCssStyle *
gtk_css_gadget_get_style (GtkCssGadget *gadget)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
return gtk_css_node_get_style (priv->node);
}
/**
* gtk_css_gadget_get_owner:
* @gadget: a #GtkCssGadget
*
* Get the widget to which this gadget belongs.
*
* Returns: (transfer none): the widget to which @gadget belongs
*/
GtkWidget *
gtk_css_gadget_get_owner (GtkCssGadget *gadget)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
return priv->owner;
}
void
gtk_css_gadget_set_visible (GtkCssGadget *gadget,
gboolean visible)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
gtk_css_node_set_visible (priv->node, visible);
}
gboolean
gtk_css_gadget_get_visible (GtkCssGadget *gadget)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
return gtk_css_node_get_visible (priv->node);
}
/**
* gtk_css_gadget_add_class:
* @gadget: a #GtkCssGadget
* @name: class name to use in CSS matching
*
* Adds a style class to the gadgets CSS node.
*/
void
gtk_css_gadget_add_class (GtkCssGadget *gadget,
const char *name)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
GQuark quark;
quark = g_quark_from_string (name);
gtk_css_node_add_class (priv->node, quark);
}
/**
* gtk_css_gadget_remove_class:
* @gadget: a #GtkCssGadget
* @name: class name
*
* Removes a style class from the gadgets CSS node.
*/
void
gtk_css_gadget_remove_class (GtkCssGadget *gadget,
const char *name)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
GQuark quark;
quark = g_quark_try_string (name);
if (quark == 0)
return;
gtk_css_node_remove_class (priv->node, quark);
}
/**
* gtk_css_gadget_set_state:
* @gadget: a #GtkCssGadget
* @state: The new state
*
* Sets the state of the gadget's CSS node.
*/
void
gtk_css_gadget_set_state (GtkCssGadget *gadget,
GtkStateFlags state)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
gtk_css_node_set_state (priv->node, state);
}
/**
* gtk_css_gadget_add_state:
* @gadget: a #GtkCssGadget
* @state: The state to add
*
* Adds the given states to the states of gadget's CSS node. Other states
* will be kept as they are.
*/
void
gtk_css_gadget_add_state (GtkCssGadget *gadget,
GtkStateFlags state)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
gtk_css_node_set_state (priv->node, gtk_css_node_get_state (priv->node) | state);
}
/**
* gtk_css_gadget_remove_state:
* @gadget: a #GtkCssGadget
* @state: The state to remove
*
* Adds the given states to the states of gadget's CSS node. Other states
* will be kept as they are.
*/
void
gtk_css_gadget_remove_state (GtkCssGadget *gadget,
GtkStateFlags state)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
gtk_css_node_set_state (priv->node, gtk_css_node_get_state (priv->node) & ~state);
}
static gint
get_number (GtkCssStyle *style,
guint property)
{
double d = _gtk_css_number_value_get (gtk_css_style_get_value (style, property), 100);
if (d < 1)
return ceil (d);
else
return floor (d);
}
/* Special-case min-width|height to round upwards, to avoid underalloc by 1px */
static int
get_number_ceil (GtkCssStyle *style,
guint property)
{
return ceil (_gtk_css_number_value_get (gtk_css_style_get_value (style, property), 100));
}
static void
get_box_margin (GtkCssStyle *style,
GtkBorder *margin)
{
margin->top = get_number (style, GTK_CSS_PROPERTY_MARGIN_TOP);
margin->left = get_number (style, GTK_CSS_PROPERTY_MARGIN_LEFT);
margin->bottom = get_number (style, GTK_CSS_PROPERTY_MARGIN_BOTTOM);
margin->right = get_number (style, GTK_CSS_PROPERTY_MARGIN_RIGHT);
}
static void
get_box_border (GtkCssStyle *style,
GtkBorder *border)
{
border->top = get_number (style, GTK_CSS_PROPERTY_BORDER_TOP_WIDTH);
border->left = get_number (style, GTK_CSS_PROPERTY_BORDER_LEFT_WIDTH);
border->bottom = get_number (style, GTK_CSS_PROPERTY_BORDER_BOTTOM_WIDTH);
border->right = get_number (style, GTK_CSS_PROPERTY_BORDER_RIGHT_WIDTH);
}
static void
get_box_padding (GtkCssStyle *style,
GtkBorder *border)
{
border->top = get_number (style, GTK_CSS_PROPERTY_PADDING_TOP);
border->left = get_number (style, GTK_CSS_PROPERTY_PADDING_LEFT);
border->bottom = get_number (style, GTK_CSS_PROPERTY_PADDING_BOTTOM);
border->right = get_number (style, GTK_CSS_PROPERTY_PADDING_RIGHT);
}
static gboolean
allocation_contains_point (GtkAllocation *allocation,
gint x,
gint y)
{
return (x >= allocation->x) &&
(x < allocation->x + allocation->width) &&
(y >= allocation->y) &&
(y < allocation->y + allocation->height);
}
static void
shift_allocation (GtkCssGadget *gadget,
GtkAllocation *allocation)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
if (priv->owner && !gtk_widget_get_has_window (priv->owner))
{
GtkAllocation widget_alloc;
gtk_widget_get_allocation (priv->owner, &widget_alloc);
allocation->x -= widget_alloc.x;
allocation->y -= widget_alloc.y;
}
}
/**
* gtk_css_gadget_margin_box_contains_point:
* @gadget: the #GtkCssGadget being tested
* @x: X coordinate of the testing point
* @y: Y coordinate of the testing point
*
* Checks whether the point at the provided coordinates is contained within the
* margin box of the gadget. The (X, Y) are relative to the gadget
* origin.
*
* Returns: %TRUE if the point at (X, Y) is contained within the margin
* box of the @gadget.
*/
gboolean
gtk_css_gadget_margin_box_contains_point (GtkCssGadget *gadget,
int x,
int y)
{
GtkAllocation margin_box = { 0, };
gtk_css_gadget_get_margin_box (gadget, &margin_box);
return allocation_contains_point (&margin_box, x, y);
}
/**
* gtk_css_gadget_border_box_contains_point:
* @gadget: the #GtkCssGadget being tested
* @x: X coordinate of the testing point
* @y: Y coordinate of the testing point
*
* Checks whether the point at the provided coordinates is contained within the
* border box of the gadget. The (X, Y) are relative to the gadget
* origin.
*
* Returns: %TRUE if the point at (X, Y) is contained within the border
* box of the @gadget.
*/
gboolean
gtk_css_gadget_border_box_contains_point (GtkCssGadget *gadget,
int x,
int y)
{
GtkAllocation border_box;
gtk_css_gadget_get_border_box (gadget, &border_box);
return allocation_contains_point (&border_box, x, y);
}
/**
* gtk_css_gadget_content_box_contains_point:
* @gadget: the #GtkCssGadget being tested
* @x: X coordinate of the testing point
* @y: Y coordinate of the testing point
*
* Checks whether the point at the provided coordinates is contained within the
* content box of the gadget. The (X, Y) are relative to the gadget
* origin.
*
* Returns: %TRUE if the point at (X, Y) is contained within the content
* box of the @gadget.
*/
gboolean
gtk_css_gadget_content_box_contains_point (GtkCssGadget *gadget,
int x,
int y)
{
GtkAllocation content_box;
gtk_css_gadget_get_content_box (gadget, &content_box);
return allocation_contains_point (&content_box, x, y);
}
/**
* gtk_css_gadget_get_preferred_size:
* @gadget: the #GtkCssGadget whose size is requested
* @orientation: whether a width (ie horizontal) or height (ie vertical) size is requested
* @for_size: the available size in the opposite direction, or -1
* @minimum: (nullable): return location for the minimum size
* @natural: (nullable): return location for the natural size
* @minimum_baseline: (nullable): return location for the baseline at minimum size
* @natural_baseline: (nullable): return location for the baseline at natural size
*
* Gets the gadgets minimum and natural size (and, optionally, baseline)
* in the given orientation for the specified size in the opposite direction.
*
* The returned values include CSS padding, border and margin in addition to the
* gadgets content size, and respect the CSS min-with or min-height properties.
*
* The @for_size is assumed to include CSS padding, border and margins as well.
*/
void
gtk_css_gadget_get_preferred_size (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkCssStyle *style;
GtkBorder margin, border, padding;
int min_size, extra_size, extra_opposite, extra_baseline;
int unused_minimum, unused_natural;
int forced_minimum, forced_natural;
int min_for_size;
if (minimum == NULL)
minimum = &unused_minimum;
if (natural == NULL)
natural = &unused_natural;
if (!gtk_css_gadget_get_visible (gadget))
{
*minimum = 0;
*natural = 0;
if (minimum_baseline)
*minimum_baseline = -1;
if (natural_baseline)
*natural_baseline = -1;
return;
}
style = gtk_css_gadget_get_style (gadget);
get_box_margin (style, &margin);
get_box_border (style, &border);
get_box_padding (style, &padding);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
extra_size = margin.left + margin.right + border.left + border.right + padding.left + padding.right;
extra_opposite = margin.top + margin.bottom + border.top + border.bottom + padding.top + padding.bottom;
extra_baseline = margin.left + border.left + padding.left;
min_size = get_number_ceil (style, GTK_CSS_PROPERTY_MIN_WIDTH);
min_for_size = get_number_ceil (style, GTK_CSS_PROPERTY_MIN_HEIGHT);
}
else
{
extra_size = margin.top + margin.bottom + border.top + border.bottom + padding.top + padding.bottom;
extra_opposite = margin.left + margin.right + border.left + border.right + padding.left + padding.right;
extra_baseline = margin.top + border.top + padding.top;
min_size = get_number_ceil (style, GTK_CSS_PROPERTY_MIN_HEIGHT);
min_for_size = get_number_ceil (style, GTK_CSS_PROPERTY_MIN_WIDTH);
}
if (for_size > -1)
{
if (for_size < min_for_size)
g_warning ("for_size smaller than min-size (%d < %d) "
"while measuring gadget (node %s, owner %s)",
for_size, min_for_size,
gtk_css_node_get_name (gtk_css_gadget_get_node (gadget)),
G_OBJECT_TYPE_NAME (gtk_css_gadget_get_owner (gadget)));
for_size = MAX (0, for_size - extra_opposite);
}
if (minimum_baseline)
*minimum_baseline = -1;
if (natural_baseline)
*natural_baseline = -1;
GTK_CSS_GADGET_GET_CLASS (gadget)->get_preferred_size (gadget,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
g_warn_if_fail (*minimum <= *natural);
forced_minimum = MAX (*minimum, min_size);
forced_natural = MAX (*natural, min_size);
if (minimum_baseline && *minimum_baseline > -1)
{
*minimum_baseline += 0.5 * (forced_minimum - *minimum);
*minimum_baseline = MAX (0, *minimum_baseline + extra_baseline);
}
if (natural_baseline && *natural_baseline > -1)
{
*natural_baseline += 0.5 * (forced_natural - *natural);
*natural_baseline = MAX (0, *natural_baseline + extra_baseline);
}
*minimum = MAX (0, forced_minimum + extra_size);
*natural = MAX (0, forced_natural + extra_size);
}
/**
* gtk_css_gadget_allocate:
* @gadget: the #GtkCssGadget to allocate
* @allocation: the allocation
* @baseline: the baseline for the allocation
* @out_clip: (out): return location for the gadgets clip region
*
* Allocates the gadget.
*
* The @allocation is assumed to include CSS padding, border and margin.
* The gadget content will be allocated a smaller area that excludes these.
* The @out_clip includes the shadow extents of the gadget in addition to
* any content clip.
*/
void
gtk_css_gadget_allocate (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
GtkAllocation content_allocation;
GtkAllocation tmp_clip;
GtkAllocation content_clip = { 0, 0, 0, 0 };
GtkBorder margin, border, padding, shadow, extents;
GtkCssStyle *style;
g_return_if_fail (out_clip != NULL);
if (!gtk_css_gadget_get_visible (gadget))
{
out_clip->x = 0;
out_clip->y = 0;
out_clip->width = 0;
out_clip->height = 0;
return;
}
priv->allocated_size = *allocation;
priv->allocated_baseline = baseline;
style = gtk_css_gadget_get_style (gadget);
get_box_margin (style, &margin);
get_box_border (style, &border);
get_box_padding (style, &padding);
extents.top = margin.top + border.top + padding.top;
extents.right = margin.right + border.right + padding.right;
extents.bottom = margin.bottom + border.bottom + padding.bottom;
extents.left = margin.left + border.left + padding.left;
content_allocation.x = allocation->x + extents.left;
content_allocation.y = allocation->y + extents.top;
content_allocation.width = allocation->width - extents.left - extents.right;
content_allocation.height = allocation->height - extents.top - extents.bottom;
if (baseline >= 0)
baseline -= extents.top;
if (content_allocation.width < 0)
{
g_warning ("Negative content width %d (allocation %d, extents %dx%d) "
"while allocating gadget (node %s, owner %s)",
content_allocation.width, allocation->width,
extents.left, extents.right,
gtk_css_node_get_name (gtk_css_gadget_get_node (gadget)),
G_OBJECT_TYPE_NAME (gtk_css_gadget_get_owner (gadget)));
content_allocation.width = 0;
}
if (content_allocation.height < 0)
{
g_warning ("Negative content height %d (allocation %d, extents %dx%d) "
"while allocating gadget (node %s, owner %s)",
content_allocation.height, allocation->height,
extents.top, extents.bottom,
gtk_css_node_get_name (gtk_css_gadget_get_node (gadget)),
G_OBJECT_TYPE_NAME (gtk_css_gadget_get_owner (gadget)));
content_allocation.height = 0;
}
GTK_CSS_GADGET_GET_CLASS (gadget)->allocate (gadget, &content_allocation, baseline, &content_clip);
_gtk_css_shadows_value_get_extents (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BOX_SHADOW), &shadow);
out_clip->x = allocation->x + margin.left - shadow.left;
out_clip->y = allocation->y + margin.top - shadow.top;
out_clip->width = MAX (0, allocation->width - margin.left - margin.right + shadow.left + shadow.right);
out_clip->height = MAX (0, allocation->height - margin.top - margin.bottom + shadow.top + shadow.bottom);
if (content_clip.width > 0 && content_clip.height > 0)
gdk_rectangle_union (&content_clip, out_clip, out_clip);
if (gtk_css_style_render_outline_get_clip (style,
allocation->x + margin.left,
allocation->y + margin.top,
allocation->width - margin.left - margin.right,
allocation->height - margin.top - margin.bottom,
&tmp_clip))
gdk_rectangle_union (&tmp_clip, out_clip, out_clip);
}
/**
* gtk_css_gadget_draw:
* @gadget: The gadget to draw
* @cr: The cairo context to draw to
*
* Will draw the gadget at the position allocated via
* gtk_css_gadget_allocate(). It is your responsibility to make
* sure that those 2 coordinate systems match.
*
* The drawing virtual function will be passed an untransformed @cr.
* This is important because functions like
* gtk_container_propagate_draw() depend on that.
*/
void
gtk_css_gadget_draw (GtkCssGadget *gadget,
cairo_t *cr)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
GtkBorder margin, border, padding;
gboolean draw_focus = FALSE;
GtkCssStyle *style;
int x, y, width, height;
int contents_x, contents_y, contents_width, contents_height;
GtkAllocation margin_box;
if (!gtk_css_gadget_get_visible (gadget))
return;
gtk_css_gadget_get_margin_box (gadget, &margin_box);
x = margin_box.x;
y = margin_box.y;
width = margin_box.width;
height = margin_box.height;
if (width < 0 || height < 0)
{
g_warning ("Drawing a gadget with negative dimensions. "
"Did you forget to allocate a size? (node %s owner %s)",
gtk_css_node_get_name (gtk_css_gadget_get_node (gadget)),
G_OBJECT_TYPE_NAME (gtk_css_gadget_get_owner (gadget)));
x = 0;
y = 0;
width = gtk_widget_get_allocated_width (priv->owner);
height = gtk_widget_get_allocated_height (priv->owner);
}
style = gtk_css_gadget_get_style (gadget);
get_box_margin (style, &margin);
get_box_border (style, &border);
get_box_padding (style, &padding);
gtk_css_style_render_background (style,
cr,
x + margin.left,
y + margin.top,
width - margin.left - margin.right,
height - margin.top - margin.bottom,
gtk_css_node_get_junction_sides (priv->node));
gtk_css_style_render_border (style,
cr,
x + margin.left,
y + margin.top,
width - margin.left - margin.right,
height - margin.top - margin.bottom,
0,
gtk_css_node_get_junction_sides (priv->node));
contents_x = x + margin.left + border.left + padding.left;
contents_y = y + margin.top + border.top + padding.top;
contents_width = width - margin.left - margin.right - border.left - border.right - padding.left - padding.right;
contents_height = height - margin.top - margin.bottom - border.top - border.bottom - padding.top - padding.bottom;
if (contents_width > 0 && contents_height > 0)
draw_focus = GTK_CSS_GADGET_GET_CLASS (gadget)->draw (gadget,
cr,
contents_x, contents_y,
contents_width, contents_height);
if (draw_focus)
gtk_css_style_render_outline (style,
cr,
x + margin.left,
y + margin.top,
width - margin.left - margin.right,
height - margin.top - margin.bottom);
#ifdef G_ENABLE_DEBUG
{
GdkDisplay *display = gtk_widget_get_display (gtk_css_gadget_get_owner (gadget));
GtkDebugFlag flags = gtk_get_display_debug_flags (display);
if G_UNLIKELY (flags & GTK_DEBUG_LAYOUT)
{
cairo_save (cr);
cairo_new_path (cr);
cairo_rectangle (cr,
x + margin.left,
y + margin.top,
width - margin.left - margin.right,
height - margin.top - margin.bottom);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0, 0, 1.0, 0.33);
cairo_stroke (cr);
cairo_rectangle (cr,
contents_x,
contents_y,
contents_width,
contents_height);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 1.0, 0, 1.0, 0.33);
cairo_stroke (cr);
cairo_restore (cr);
}
if G_UNLIKELY (flags & GTK_DEBUG_BASELINES)
{
int baseline = priv->allocated_baseline;
if (baseline != -1)
{
if (priv->owner && !gtk_widget_get_has_window (priv->owner))
{
GtkAllocation widget_alloc;
gtk_widget_get_allocation (priv->owner, &widget_alloc);
baseline -= widget_alloc.y;
}
cairo_save (cr);
cairo_new_path (cr);
cairo_move_to (cr, x + margin.left, baseline + 0.5);
cairo_rel_line_to (cr, width - margin.left - margin.right, 0);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 1.0, 0, 0.25, 0.25);
cairo_stroke (cr);
cairo_restore (cr);
}
}
}
#endif
}
void
gtk_css_gadget_queue_resize (GtkCssGadget *gadget)
{
g_return_if_fail (GTK_IS_CSS_GADGET (gadget));
gtk_widget_queue_resize (gtk_css_gadget_get_owner (gadget));
}
void
gtk_css_gadget_queue_allocate (GtkCssGadget *gadget)
{
g_return_if_fail (GTK_IS_CSS_GADGET (gadget));
gtk_widget_queue_allocate (gtk_css_gadget_get_owner (gadget));
}
void
gtk_css_gadget_queue_draw (GtkCssGadget *gadget)
{
g_return_if_fail (GTK_IS_CSS_GADGET (gadget));
/* XXX: Only invalidate clip here */
gtk_widget_queue_draw (gtk_css_gadget_get_owner (gadget));
}
/**
* gtk_css_gadget_get_margin_box:
* @gadget: a #GtkCssGadget
* @box: (out): Return location for gadget's the margin box
*
* Returns the margin box of the gadget. The box coordinates are relative to
* the gadget origin. Compare with gtk_css_gadget_get_margin_allocation(),
* which returns the margin box in the widget allocation coordinates.
*/
void
gtk_css_gadget_get_margin_box (GtkCssGadget *gadget,
GtkAllocation *box)
{
gtk_css_gadget_get_margin_allocation (gadget, box, NULL);
shift_allocation (gadget, box);
}
/**
* gtk_css_gadget_get_border_box:
* @gadget: a #GtkCssGadget
* @box: (out): Return location for gadget's the border box
*
* Returns the border box of the gadget. The box coordinates are relative to
* the gadget origin. Compare with gtk_css_gadget_get_border_allocation(),
* which returns the border box in the widget allocation coordinates.
*/
void
gtk_css_gadget_get_border_box (GtkCssGadget *gadget,
GtkAllocation *box)
{
gtk_css_gadget_get_border_allocation (gadget, box, NULL);
shift_allocation (gadget, box);
}
/**
* gtk_css_gadget_get_content_box:
* @gadget: a #GtkCssGadget
* @box: (out): Return location for gadget's the content box
*
* Returns the content box of the gadget. The box coordinates are relative to
* the gadget origin. Compare with gtk_css_gadget_get_content_allocation(),
* which returns the content box in the widget allocation coordinates.
*/
void
gtk_css_gadget_get_content_box (GtkCssGadget *gadget,
GtkAllocation *box)
{
gtk_css_gadget_get_content_allocation (gadget, box, NULL);
shift_allocation (gadget, box);
}
void
gtk_css_gadget_get_margin_allocation (GtkCssGadget *gadget,
GtkAllocation *allocation,
int *baseline)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
g_return_if_fail (GTK_IS_CSS_GADGET (gadget));
if (!gtk_css_gadget_get_visible (gadget))
{
if (allocation)
allocation->x = allocation->y = allocation->width = allocation->height = 0;
if (baseline)
*baseline = -1;
return;
}
if (allocation)
*allocation = priv->allocated_size;
if (baseline)
*baseline = priv->allocated_baseline;
}
void
gtk_css_gadget_get_border_allocation (GtkCssGadget *gadget,
GtkAllocation *allocation,
int *baseline)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
GtkBorder margin;
g_return_if_fail (GTK_IS_CSS_GADGET (gadget));
if (!gtk_css_gadget_get_visible (gadget))
{
if (allocation)
allocation->x = allocation->y = allocation->width = allocation->height = 0;
if (baseline)
*baseline = -1;
return;
}
get_box_margin (gtk_css_gadget_get_style (gadget), &margin);
if (allocation)
{
allocation->x = priv->allocated_size.x + margin.left;
allocation->y = priv->allocated_size.y + margin.top;
allocation->width = MAX (0, priv->allocated_size.width - margin.left - margin.right);
allocation->height = MAX (0, priv->allocated_size.height - margin.top - margin.bottom);
}
if (baseline)
{
if (priv->allocated_baseline >= 0)
*baseline = priv->allocated_baseline - margin.top;
else
*baseline = -1;
}
}
void
gtk_css_gadget_get_content_allocation (GtkCssGadget *gadget,
GtkAllocation *allocation,
int *baseline)
{
GtkCssGadgetPrivate *priv = gtk_css_gadget_get_instance_private (gadget);
GtkBorder margin, border, padding, extents;
GtkCssStyle *style;
g_return_if_fail (GTK_IS_CSS_GADGET (gadget));
if (!gtk_css_gadget_get_visible (gadget))
{
if (allocation)
allocation->x = allocation->y = allocation->width = allocation->height = 0;
if (baseline)
*baseline = -1;
return;
}
style = gtk_css_gadget_get_style (gadget);
get_box_margin (style, &margin);
get_box_border (style, &border);
get_box_padding (style, &padding);
extents.top = margin.top + border.top + padding.top;
extents.right = margin.right + border.right + padding.right;
extents.bottom = margin.bottom + border.bottom + padding.bottom;
extents.left = margin.left + border.left + padding.left;
if (allocation)
{
allocation->x = priv->allocated_size.x + extents.left;
allocation->y = priv->allocated_size.y + extents.top;
allocation->width = MAX (0, priv->allocated_size.width - extents.left - extents.right);
allocation->height = MAX (0, priv->allocated_size.height - extents.top - extents.bottom);
}
if (baseline)
{
if (priv->allocated_baseline >= 0)
*baseline = priv->allocated_baseline - extents.top;
else
*baseline = -1;
}
}
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