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Added gtk_cell_renderer_get_aligned_area() and class vfunc.

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Since a cell renderer might use more space than the natural
size when recieving expand space it's impossible to know how
much space is actually used to render content.

Adding this virtual method to allow text renderers to implement
it, the base default method uses height-for-width apis and aligns
the cell assuming the renderer uses a fixed size.

This commit removes the similar code from gtkcellarea and
subclasses.
This commit is contained in:
Tristan Van Berkom
2010-11-25 17:41:26 +09:00
parent 5f7787ab2e
commit 2dd2c7ce05
6 changed files with 142 additions and 83 deletions
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100
gtk/gtkcellrenderer.c
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@ -97,7 +97,11 @@ static void gtk_cell_renderer_real_get_preferred_width_for_height(GtkCellRendere
gint height,
gint *minimum_width,
gint *natural_width);
static void gtk_cell_renderer_real_get_aligned_area (GtkCellRenderer *cell,
GtkWidget *widget,
GtkCellRendererState flags,
const GdkRectangle *cell_area,
GdkRectangle *aligned_area);
struct _GtkCellRendererPrivate
@ -192,6 +196,7 @@ gtk_cell_renderer_class_init (GtkCellRendererClass *class)
class->get_preferred_height = gtk_cell_renderer_real_get_preferred_height;
class->get_preferred_width_for_height = gtk_cell_renderer_real_get_preferred_width_for_height;
class->get_preferred_height_for_width = gtk_cell_renderer_real_get_preferred_height_for_width;
class->get_aligned_area = gtk_cell_renderer_real_get_aligned_area;
/**
* GtkCellRenderer::editing-canceled:
@ -1236,6 +1241,67 @@ gtk_cell_renderer_real_get_preferred_width_for_height (GtkCellRenderer *cell,
gtk_cell_renderer_get_preferred_width (cell, widget, minimum_width, natural_width);
}
/* Default implementation assumes that a cell renderer will never use more
* space than it's natural size (this is fine for toggles and pixbufs etc
* but needs to be overridden from wrapping/ellipsizing text renderers) */
static void
gtk_cell_renderer_real_get_aligned_area (GtkCellRenderer *cell,
GtkWidget *widget,
GtkCellRendererState flags,
const GdkRectangle *cell_area,
GdkRectangle *aligned_area)
{
gint opposite_size, x_offset, y_offset;
gint natural_size;
g_return_if_fail (GTK_IS_CELL_RENDERER (cell));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (cell_area != NULL);
g_return_if_fail (aligned_area != NULL);
*aligned_area = *cell_area;
/* Trim up the aligned size */
if (gtk_cell_renderer_get_request_mode (cell) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
{
gtk_cell_renderer_get_preferred_width (cell, widget,
NULL, &natural_size);
aligned_area->width = MIN (aligned_area->width, natural_size);
gtk_cell_renderer_get_preferred_height_for_width (cell, widget,
aligned_area->width,
NULL, &opposite_size);
aligned_area->height = MIN (opposite_size, aligned_area->height);
}
else
{
gtk_cell_renderer_get_preferred_height (cell, widget,
NULL, &natural_size);
aligned_area->height = MIN (aligned_area->width, natural_size);
gtk_cell_renderer_get_preferred_width_for_height (cell, widget,
aligned_area->height,
NULL, &opposite_size);
aligned_area->width = MIN (opposite_size, aligned_area->width);
}
/* offset the cell position */
_gtk_cell_renderer_calc_offset (cell, cell_area,
gtk_widget_get_direction (widget),
aligned_area->width,
aligned_area->height,
&x_offset, &y_offset);
aligned_area->x += x_offset;
aligned_area->y += y_offset;
}
/* An internal convenience function for some containers to peek at the
* cell alignment in a target allocation (used to draw focus and align
* cells in the icon view).
@ -1561,3 +1627,35 @@ gtk_cell_renderer_get_preferred_size (GtkCellRenderer *cell,
}
}
}
/**
* gtk_cell_renderer_get_aligned_area:
* @cell: a #GtkCellRenderer instance
* @widget: the #GtkWidget this cell will be rendering to
* @flags: render flags
* @cell_area: cell area which would be passed to gtk_cell_renderer_render()
* @aligned_area: the return location for the space inside @cell_area that
* would acually be used to render.
*
* Gets the aligned area used by @cell inside @cell_area. Used for finding
* the appropriate edit and focus rectangle.
*
* Since: 3.0
*/
void
gtk_cell_renderer_get_aligned_area (GtkCellRenderer *cell,
GtkWidget *widget,
GtkCellRendererState flags,
const GdkRectangle *cell_area,
GdkRectangle *aligned_area)
{
GtkCellRendererClass *klass;
g_return_if_fail (GTK_IS_CELL_RENDERER (cell));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (cell_area != NULL);
g_return_if_fail (aligned_area != NULL);
klass = GTK_CELL_RENDERER_GET_CLASS (cell);
klass->get_aligned_area (cell, widget, flags, cell_area, aligned_area);
}